Initial import.

1 files changed, 4777 insertions, 0 deletions

diff --git a/src/mesa/drivers/x11/xm_span.c b/src/mesa/drivers/x11/xm_span.c
new file mode 100644
index 0000000..807be39
--- /dev/null
+++ b/src/mesa/drivers/x11/xm_span.c
@@ -0,0 +1,4777 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.2.1
+ *
+ * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+/* $XFree86: xc/extras/Mesa/src/X/xm_span.c,v 1.3 2002/02/27 21:07:54 tsi Exp $ */
+
+#include "glxheader.h"
+#include "colormac.h"
+#include "context.h"
+#include "depth.h"
+#include "drawpix.h"
+#include "extensions.h"
+#include "macros.h"
+#include "imports.h"
+#include "mtypes.h"
+#include "state.h"
+#include "xmesaP.h"
+
+#include "swrast/swrast.h"
+
+
+/*
+ * The following functions are used to trap XGetImage() calls which
+ * generate BadMatch errors if the drawable isn't mapped.
+ */
+
+#ifndef XFree86Server
+static int caught_xgetimage_error = 0;
+static int (*old_xerror_handler)( XMesaDisplay *dpy, XErrorEvent *ev );
+static unsigned long xgetimage_serial;
+
+/*
+ * This is the error handler which will be called if XGetImage fails.
+ */
+static int xgetimage_error_handler( XMesaDisplay *dpy, XErrorEvent *ev )
+{
+   if (ev->serial==xgetimage_serial && ev->error_code==BadMatch) {
+      /* caught the expected error */
+      caught_xgetimage_error = 0;
+   }
+   else {
+      /* call the original X error handler, if any.  otherwise ignore */
+      if (old_xerror_handler) {
+         (*old_xerror_handler)( dpy, ev );
+      }
+   }
+   return 0;
+}
+
+
+/*
+ * Call this right before XGetImage to setup error trap.
+ */
+static void catch_xgetimage_errors( XMesaDisplay *dpy )
+{
+   xgetimage_serial = NextRequest( dpy );
+   old_xerror_handler = XSetErrorHandler( xgetimage_error_handler );
+   caught_xgetimage_error = 0;
+}
+
+
+/*
+ * Call this right after XGetImage to check if an error occured.
+ */
+static int check_xgetimage_errors( void )
+{
+   /* restore old handler */
+   (void) XSetErrorHandler( old_xerror_handler );
+   /* return 0=no error, 1=error caught */
+   return caught_xgetimage_error;
+}
+#endif
+
+
+/*
+ * Read a pixel from an X drawable.
+ */
+static unsigned long read_pixel( XMesaDisplay *dpy,
+                                 XMesaDrawable d, int x, int y )
+{
+   unsigned long p;
+#ifndef XFree86Server
+   XMesaImage *pixel = NULL;
+   int error;
+
+   catch_xgetimage_errors( dpy );
+   pixel = XGetImage( dpy, d, x, y, 1, 1, AllPlanes, ZPixmap );
+   error = check_xgetimage_errors();
+   if (pixel && !error) {
+      p = XMesaGetPixel( pixel, 0, 0 );
+   }
+   else {
+      p = 0;
+   }
+   if (pixel) {
+      XMesaDestroyImage( pixel );
+   }
+#else
+   (*dpy->GetImage)(d, x, y, 1, 1, ZPixmap, ~0L, (pointer)&p);
+#endif
+   return p;
+}
+
+
+
+/*
+ * The Mesa library needs to be able to draw pixels in a number of ways:
+ *   1. RGB vs Color Index
+ *   2. as horizontal spans (polygons, images) vs random locations (points,
+ *      lines)
+ *   3. different color per-pixel or same color for all pixels
+ *
+ * Furthermore, the X driver needs to support rendering to 3 possible
+ * "buffers", usually one, but sometimes two at a time:
+ *   1. The front buffer as an X window
+ *   2. The back buffer as a Pixmap
+ *   3. The back buffer as an XImage
+ *
+ * Finally, if the back buffer is an XImage, we can avoid using XPutPixel and
+ * optimize common cases such as 24-bit and 8-bit modes.
+ *
+ * By multiplication, there's at least 48 possible combinations of the above.
+ *
+ * Below are implementations of the most commonly used combinations.  They are
+ * accessed through function pointers which get initialized here and are used
+ * directly from the Mesa library.  The 8 function pointers directly correspond
+ * to the first 3 cases listed above.
+ *
+ *
+ * The function naming convention is:
+ *
+ *   write_[span|pixels]_[mono]_[format]_[pixmap|ximage]
+ *
+ * New functions optimized for specific cases can be added without too much
+ * trouble.  An example might be the 24-bit TrueColor mode 8A8R8G8B which is
+ * found on IBM RS/6000 X servers.
+ */
+
+
+
+
+/**********************************************************************/
+/*** Write COLOR SPAN functions                                     ***/
+/**********************************************************************/
+
+
+#define RGBA_SPAN_ARGS	const GLcontext *ctx,				\
+			GLuint n, GLint x, GLint y,			\
+			CONST GLubyte rgba[][4], const GLubyte mask[]
+
+#define RGB_SPAN_ARGS	const GLcontext *ctx,				\
+			GLuint n, GLint x, GLint y,			\
+			CONST GLubyte rgb[][3], const GLubyte mask[]
+
+
+/* NOTE: if mask==NULL, draw all pixels */
+
+
+/*
+ * Write a span of PF_TRUECOLOR pixels to a pixmap.
+ */
+static void write_span_TRUECOLOR_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            unsigned long p;
+            PACK_TRUECOLOR( p, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+            XMesaSetForeground( dpy, gc, p );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         unsigned long p;
+         PACK_TRUECOLOR( p, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+         XMesaPutPixel( rowimg, i, 0, p );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_TRUECOLOR pixels to a pixmap.
+ */
+static void write_span_rgb_TRUECOLOR_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            unsigned long p;
+            PACK_TRUECOLOR( p, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+            XMesaSetForeground( dpy, gc, p );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         unsigned long p;
+         PACK_TRUECOLOR( p, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+         XMesaPutPixel( rowimg, i, 0, p );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_TRUEDITHER pixels to a pixmap.
+ */
+static void write_span_TRUEDITHER_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            unsigned long p;
+            PACK_TRUEDITHER(p, x, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+            XMesaSetForeground( dpy, gc, p );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         unsigned long p;
+         PACK_TRUEDITHER(p, x+i, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+         XMesaPutPixel( rowimg, i, 0, p );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_TRUEDITHER pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_TRUEDITHER_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            unsigned long p;
+            PACK_TRUEDITHER(p, x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+            XMesaSetForeground( dpy, gc, p );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         unsigned long p;
+         PACK_TRUEDITHER(p, x+i, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+         XMesaPutPixel( rowimg, i, 0, p );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+
+/*
+ * Write a span of PF_8A8B8G8R pixels to a pixmap.
+ */
+static void write_span_8A8B8G8R_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc,
+                         PACK_8A8B8G8R(rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP]) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLuint *ptr4 = (GLuint *) rowimg->data;
+      for (i=0;i<n;i++) {
+         *ptr4++ = PACK_8A8B8G8R( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_8A8B8G8R pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_8A8B8G8R_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc,
+                   PACK_8B8G8R(rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLuint *ptr4 = (GLuint *) rowimg->data;
+      for (i=0;i<n;i++) {
+         *ptr4++ = PACK_8B8G8R(rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+/*
+ * Write a span of PF_8A8R8G8B pixels to a pixmap.
+ */
+static void write_span_8A8R8G8B_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc,
+                         PACK_8A8R8G8B(rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP]) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLuint *ptr4 = (GLuint *) rowimg->data;
+      for (i=0;i<n;i++) {
+         *ptr4++ = PACK_8A8R8G8B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_8A8R8G8B pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_8A8R8G8B_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc,
+                   PACK_8R8G8B(rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLuint *ptr4 = (GLuint *) rowimg->data;
+      for (i=0;i<n;i++) {
+         *ptr4++ = PACK_8R8G8B(rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_8R8G8B pixels to a pixmap.
+ */
+static void write_span_8R8G8B_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, PACK_8R8G8B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ));
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLuint *ptr4 = (GLuint *) rowimg->data;
+      for (i=0;i<n;i++) {
+         *ptr4++ = PACK_8R8G8B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_8R8G8B24 pixels to a pixmap.
+ */
+static void write_span_8R8G8B24_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      register GLuint i;
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc,
+               PACK_8R8G8B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ));
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLuint *ptr4 = (GLuint *) rowimg->data;
+      register GLuint pixel;
+      static const GLuint shift[4] = {0, 8, 16, 24};
+      register GLuint i = 0;
+      int w = n;
+      while (w > 3) {
+         pixel  = rgba[i][BCOMP] /* << shift[0]*/;
+         pixel |= rgba[i][GCOMP]    << shift[1];
+         pixel |= rgba[i++][RCOMP]  << shift[2];
+         pixel |= rgba[i][BCOMP]    << shift[3];
+         *ptr4++ = pixel;
+
+         pixel  = rgba[i][GCOMP] /* << shift[0]*/;
+         pixel |= rgba[i++][RCOMP]  << shift[1];
+         pixel |= rgba[i][BCOMP]    << shift[2];
+         pixel |= rgba[i][GCOMP]    << shift[3];
+         *ptr4++ = pixel;
+
+         pixel  = rgba[i++][RCOMP]/* << shift[0]*/;
+         pixel |= rgba[i][BCOMP]     << shift[1];
+         pixel |= rgba[i][GCOMP]     << shift[2];
+         pixel |= rgba[i++][RCOMP]   << shift[3];
+         *ptr4++ = pixel;
+
+         w -= 4;
+      }
+      switch (w) {
+         case 3:
+            pixel = 0;
+            pixel |= rgba[i][BCOMP] /*<< shift[0]*/;
+            pixel |= rgba[i][GCOMP]   << shift[1];
+            pixel |= rgba[i++][RCOMP] << shift[2];
+            pixel |= rgba[i][BCOMP]   << shift[3];
+            *ptr4++ = pixel;
+            pixel = 0;
+            pixel |= rgba[i][GCOMP] /*<< shift[0]*/;
+            pixel |= rgba[i++][RCOMP] << shift[1];
+            pixel |= rgba[i][BCOMP]   << shift[2];
+            pixel |= rgba[i][GCOMP]   << shift[3];
+            *ptr4++ = pixel;
+            pixel = 0xffffff00 & *ptr4;
+            pixel |= rgba[i][RCOMP] /*<< shift[0]*/;
+            *ptr4 = pixel;
+            break;
+         case 2:
+            pixel = 0;
+            pixel |= rgba[i][BCOMP] /*<< shift[0]*/;
+            pixel |= rgba[i][GCOMP]   << shift[1];
+            pixel |= rgba[i++][RCOMP] << shift[2];
+            pixel |= rgba[i][BCOMP]   << shift[3];
+            *ptr4++ = pixel;
+            pixel = 0xffff0000 & *ptr4;
+            pixel |= rgba[i][GCOMP] /*<< shift[0]*/;
+            pixel |= rgba[i][RCOMP]   << shift[1];
+            *ptr4 = pixel;
+            break;
+         case 1:
+            pixel = 0xff000000 & *ptr4;
+            pixel |= rgba[i][BCOMP] /*<< shift[0]*/;
+            pixel |= rgba[i][GCOMP] << shift[1];
+            pixel |= rgba[i][RCOMP] << shift[2];
+            *ptr4 = pixel;
+            break;
+         case 0:
+            break;
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_8R8G8B pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_8R8G8B_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, PACK_8R8G8B( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] ));
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLuint *ptr4 = (GLuint *) rowimg->data;
+      for (i=0;i<n;i++) {
+         *ptr4++ = PACK_8R8G8B( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_8R8G8B24 pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_8R8G8B24_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      register GLuint i;
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc,
+                  PACK_8R8G8B( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] ));
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLuint *ptr4 = (GLuint *) rowimg->data;
+      register GLuint pixel;
+      static const GLuint shift[4] = {0, 8, 16, 24};
+      unsigned w = n;
+      register GLuint i = 0;
+      while (w > 3) {
+         pixel = 0;
+         pixel |= rgb[i][BCOMP]/* << shift[0]*/;
+         pixel |= rgb[i][GCOMP] << shift[1];
+         pixel |= rgb[i++][RCOMP] << shift[2];
+         pixel |= rgb[i][BCOMP] <<shift[3];
+         *ptr4++ = pixel;
+
+         pixel = 0;
+         pixel |= rgb[i][GCOMP]/* << shift[0]*/;
+         pixel |= rgb[i++][RCOMP] << shift[1];
+         pixel |= rgb[i][BCOMP] << shift[2];
+         pixel |= rgb[i][GCOMP] << shift[3];
+         *ptr4++ = pixel;
+
+         pixel = 0;
+         pixel |= rgb[i++][RCOMP]/* << shift[0]*/;
+         pixel |= rgb[i][BCOMP] << shift[1];
+         pixel |= rgb[i][GCOMP] << shift[2];
+         pixel |= rgb[i++][RCOMP] << shift[3];
+         *ptr4++ = pixel;
+         w -= 4;
+      }
+      switch (w) {
+         case 3:
+            pixel = 0;
+            pixel |= rgb[i][BCOMP]/* << shift[0]*/;
+            pixel |= rgb[i][GCOMP] << shift[1];
+            pixel |= rgb[i++][RCOMP] << shift[2];
+            pixel |= rgb[i][BCOMP] << shift[3];
+            *ptr4++ = pixel;
+            pixel = 0;
+            pixel |= rgb[i][GCOMP]/* << shift[0]*/;
+            pixel |= rgb[i++][RCOMP] << shift[1];
+            pixel |= rgb[i][BCOMP] << shift[2];
+            pixel |= rgb[i][GCOMP] << shift[3];
+            *ptr4++ = pixel;
+            pixel = *ptr4;
+            pixel &= 0xffffff00;
+            pixel |= rgb[i++][RCOMP]/* << shift[0]*/;
+            *ptr4++ = pixel;
+            break;
+         case 2:
+            pixel = 0;
+            pixel |= rgb[i][BCOMP]/* << shift[0]*/;
+            pixel |= rgb[i][GCOMP] << shift[1];
+            pixel |= rgb[i++][RCOMP] << shift[2];
+            pixel |= rgb[i][BCOMP]  << shift[3];
+            *ptr4++ = pixel;
+            pixel = *ptr4;
+            pixel &= 0xffff0000;
+            pixel |= rgb[i][GCOMP]/* << shift[0]*/;
+            pixel |= rgb[i++][RCOMP] << shift[1];
+            *ptr4++ = pixel;
+            break;
+         case 1:
+            pixel = *ptr4;
+            pixel &= 0xff000000;
+            pixel |= rgb[i][BCOMP]/* << shift[0]*/;
+            pixel |= rgb[i][GCOMP] << shift[1];
+            pixel |= rgb[i++][RCOMP] << shift[2];
+            *ptr4++ = pixel;
+            break;
+         case 0:
+            break;
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_5R6G5B pixels to a pixmap.
+ */
+static void write_span_5R6G5B_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, PACK_5R6G5B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ));
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLushort *ptr2 = (GLushort *) rowimg->data;
+      for (i=0;i<n;i++) {
+         ptr2[i] = PACK_5R6G5B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_DITHER_5R6G5B pixels to a pixmap.
+ */
+static void write_span_DITHER_5R6G5B_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            unsigned long p;
+            PACK_TRUEDITHER(p, x, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+            XMesaSetForeground( dpy, gc, p );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLushort *ptr2 = (GLushort *) rowimg->data;
+      for (i=0;i<n;i++) {
+         PACK_TRUEDITHER( ptr2[i], x+i, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_5R6G5B pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_5R6G5B_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, PACK_5R6G5B( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] ));
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLushort *ptr2 = (GLushort *) rowimg->data;
+      for (i=0;i<n;i++) {
+         ptr2[i] = PACK_5R6G5B( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_DITHER_5R6G5B pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_DITHER_5R6G5B_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            unsigned long p;
+            PACK_TRUEDITHER(p, x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+            XMesaSetForeground( dpy, gc, p );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLushort *ptr2 = (GLushort *) rowimg->data;
+      for (i=0;i<n;i++) {
+         PACK_TRUEDITHER( ptr2[i], x+i, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+
+/*
+ * Write a span of PF_DITHER pixels to a pixmap.
+ */
+static void write_span_DITHER_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   XDITHER_SETUP(y);
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, XDITHER(x, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         XMesaPutPixel( rowimg, i, 0, XDITHER(x+i, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]) );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_DITHER pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_DITHER_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   XDITHER_SETUP(y);
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, XDITHER(x, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         XMesaPutPixel( rowimg, i, 0, XDITHER(x+i, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]) );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_1BIT pixels to a pixmap.
+ */
+static void write_span_1BIT_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   SETUP_1BIT;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc,
+                            DITHER_1BIT( x, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         XMesaPutPixel( rowimg, i, 0,
+                    DITHER_1BIT( x+i, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_1BIT pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_1BIT_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   SETUP_1BIT;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc,
+              DITHER_1BIT(x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         XMesaPutPixel( rowimg, i, 0,
+          DITHER_1BIT(x+i, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]) );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_HPCR pixels to a pixmap.
+ */
+static void write_span_HPCR_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc,
+                            DITHER_HPCR( x, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLubyte *ptr = (GLubyte *) xmesa->xm_buffer->rowimage->data;
+      for (i=0;i<n;i++) {
+         ptr[i] = DITHER_HPCR( (x+i), y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_HPCR pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_HPCR_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc,
+              DITHER_HPCR(x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      register GLubyte *ptr = (GLubyte *) xmesa->xm_buffer->rowimage->data;
+      for (i=0;i<n;i++) {
+         ptr[i] = DITHER_HPCR( (x+i), y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_LOOKUP pixels to a pixmap.
+ */
+static void write_span_LOOKUP_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   LOOKUP_SETUP;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, LOOKUP( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         XMesaPutPixel( rowimg, i, 0, LOOKUP(rgba[i][RCOMP],rgba[i][GCOMP],rgba[i][BCOMP]) );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_LOOKUP pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_LOOKUP_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   LOOKUP_SETUP;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, LOOKUP( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] ) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         XMesaPutPixel( rowimg, i, 0, LOOKUP(rgb[i][RCOMP],rgb[i][GCOMP],rgb[i][BCOMP]) );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+
+/*
+ * Write a span of PF_GRAYSCALE pixels to a pixmap.
+ */
+static void write_span_GRAYSCALE_pixmap( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, GRAY_RGB( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         XMesaPutPixel( rowimg, i, 0, GRAY_RGB(rgba[i][RCOMP],rgba[i][GCOMP],rgba[i][BCOMP]) );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_GRAYSCALE pixels to a pixmap (no alpha).
+ */
+static void write_span_rgb_GRAYSCALE_pixmap( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, GRAY_RGB( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] ) );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      XMesaImage *rowimg = xmesa->xm_buffer->rowimage;
+      for (i=0;i<n;i++) {
+         XMesaPutPixel( rowimg, i, 0, GRAY_RGB(rgb[i][RCOMP],rgb[i][GCOMP],rgb[i][BCOMP]) );
+      }
+      XMesaPutImage( dpy, buffer, gc, rowimg, 0, 0, x, y, n, 1 );
+   }
+}
+
+
+/*
+ * Write a span of PF_TRUECOLOR pixels to an XImage.
+ */
+static void write_span_TRUECOLOR_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            unsigned long p;
+            PACK_TRUECOLOR( p, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+            XMesaPutPixel( img, x, y, p );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         unsigned long p;
+         PACK_TRUECOLOR( p, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+         XMesaPutPixel( img, x, y, p );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_TRUECOLOR pixels to an XImage (no alpha).
+ */
+static void write_span_rgb_TRUECOLOR_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            unsigned long p;
+            PACK_TRUECOLOR( p, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+            XMesaPutPixel( img, x, y, p );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         unsigned long p;
+         PACK_TRUECOLOR( p, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+         XMesaPutPixel( img, x, y, p );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_TRUEDITHER pixels to an XImage.
+ */
+static void write_span_TRUEDITHER_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            unsigned long p;
+            PACK_TRUEDITHER(p, x, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+            XMesaPutPixel( img, x, y, p );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         unsigned long p;
+         PACK_TRUEDITHER(p, x, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+         XMesaPutPixel( img, x, y, p );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_TRUEDITHER pixels to an XImage (no alpha).
+ */
+static void write_span_rgb_TRUEDITHER_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            unsigned long p;
+            PACK_TRUEDITHER(p, x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+            XMesaPutPixel( img, x, y, p );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         unsigned long p;
+         PACK_TRUEDITHER(p, x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+         XMesaPutPixel( img, x, y, p );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_8A8B8G8R-format pixels to an ximage.
+ */
+static void write_span_8A8B8G8R_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            ptr[i] = PACK_8A8B8G8R( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++) {
+         ptr[i] = PACK_8A8B8G8R( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_8A8B8G8R-format pixels to an ximage (no alpha).
+ */
+static void write_span_rgb_8A8B8G8R_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            ptr[i] = PACK_8A8B8G8R( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP], 255 );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++) {
+         ptr[i] = PACK_8A8B8G8R( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP], 255 );
+      }
+   }
+}
+
+/*
+ * Write a span of PF_8A8R8G8B-format pixels to an ximage.
+ */
+static void write_span_8A8R8G8B_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            ptr[i] = PACK_8A8R8G8B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++) {
+         ptr[i] = PACK_8A8R8G8B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_8A8R8G8B-format pixels to an ximage (no alpha).
+ */
+static void write_span_rgb_8A8R8G8B_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            ptr[i] = PACK_8A8R8G8B( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP], 255 );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++) {
+         ptr[i] = PACK_8A8R8G8B( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP], 255 );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_8R8G8B-format pixels to an ximage.
+ */
+static void write_span_8R8G8B_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            ptr[i] = PACK_8R8G8B(rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+         }
+      }
+   }
+   else {
+      for (i=0;i<n;i++) {
+         ptr[i] = PACK_8R8G8B(rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_8R8G8B24-format pixels to an ximage.
+ */
+static void write_span_8R8G8B24_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte *ptr = (GLubyte *) PIXELADDR3( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            GLuint *ptr4 = (GLuint *) ptr;
+            register GLuint pixel = *ptr4;
+            switch (3 & (int)(ptr - (GLubyte*)ptr4)) {
+               case 0:
+                  pixel &= 0xff000000;
+                  pixel |= rgba[i][BCOMP];
+                  pixel |= rgba[i][GCOMP] << 8;
+                  pixel |= rgba[i][RCOMP] << 16;
+                  *ptr4 = pixel;
+                  break;
+               case 3:
+                  pixel &= 0x00ffffff;
+                  pixel |= rgba[i][BCOMP] << 24;
+                  *ptr4++ = pixel;
+                  pixel = *ptr4 && 0xffff0000;
+                  pixel |= rgba[i][GCOMP];
+                  pixel |= rgba[i][RCOMP] << 8;
+                  *ptr4 = pixel;
+                  break;
+               case 2:
+                  pixel &= 0x0000ffff;
+                  pixel |= rgba[i][BCOMP] << 16;
+                  pixel |= rgba[i][GCOMP] << 24;
+                  *ptr4++ = pixel;
+                  pixel = *ptr4 && 0xffffff00;
+                  pixel |= rgba[i][RCOMP];
+                  *ptr4 = pixel;
+                  break;
+               case 1:
+                  pixel &= 0x000000ff;
+                  pixel |= rgba[i][BCOMP] << 8;
+                  pixel |= rgba[i][GCOMP] << 16;
+                  pixel |= rgba[i][RCOMP] << 24;
+                  *ptr4 = pixel;
+                  break;
+            }
+         }
+	 ptr += 3;
+      }
+   }
+   else {
+      /* write all pixels */
+      int w = n;
+      GLuint *ptr4 = (GLuint *) ptr;
+      register GLuint pixel = *ptr4;
+      int index = (int)(ptr - (GLubyte *)ptr4);
+      register GLuint i = 0;
+      switch (index) {
+         case 0:
+            break;
+         case 1:
+            pixel &= 0x00ffffff;
+            pixel |= rgba[i][BCOMP] << 24;
+            *ptr4++ = pixel;
+            pixel = *ptr4 && 0xffff0000;
+            pixel |= rgba[i][GCOMP];
+            pixel |= rgba[i++][RCOMP] << 8;
+            *ptr4 = pixel;
+            if (0 == --w)
+               break;
+         case 2:
+            pixel &= 0x0000ffff;
+            pixel |= rgba[i][BCOMP] << 16;
+            pixel |= rgba[i][GCOMP] << 24;
+            *ptr4++ = pixel;
+            pixel = *ptr4 && 0xffffff00;
+            pixel |= rgba[i++][RCOMP];
+            *ptr4 = pixel;
+            if (0 == --w)
+               break;
+         case 3:
+            pixel &= 0x000000ff;
+            pixel |= rgba[i][BCOMP] << 8;
+            pixel |= rgba[i][GCOMP] << 16;
+            pixel |= rgba[i++][RCOMP] << 24;
+            *ptr4++ = pixel;
+            if (0 == --w)
+               break;
+            break;
+      }
+      while (w > 3) {
+         pixel = rgba[i][BCOMP];
+         pixel |= rgba[i][GCOMP] << 8;
+         pixel |= rgba[i++][RCOMP] << 16;
+         pixel |= rgba[i][BCOMP] << 24;
+         *ptr4++ = pixel;
+         pixel = rgba[i][GCOMP];
+         pixel |= rgba[i++][RCOMP] << 8;
+         pixel |= rgba[i][BCOMP] << 16;
+         pixel |= rgba[i][GCOMP] << 24;
+         *ptr4++ = pixel;
+         pixel = rgba[i++][RCOMP];
+         pixel |= rgba[i][BCOMP] << 8;
+         pixel |= rgba[i][GCOMP] << 16;
+         pixel |= rgba[i++][RCOMP] << 24;
+         *ptr4++ = pixel;
+         w -= 4;
+      }
+      switch (w) {
+         case 0:
+            break;
+         case 1:
+            pixel = *ptr4 & 0xff000000;
+            pixel |= rgba[i][BCOMP];
+            pixel |= rgba[i][GCOMP] << 8;
+            pixel |= rgba[i][RCOMP] << 16;
+            *ptr4 = pixel;
+            break;
+         case 2:
+            pixel = rgba[i][BCOMP];
+            pixel |= rgba[i][GCOMP] << 8;
+            pixel |= rgba[i++][RCOMP] << 16;
+            pixel |= rgba[i][BCOMP] << 24;
+            *ptr4++ = pixel;
+            pixel = *ptr4 & 0xffff0000;
+            pixel |= rgba[i][GCOMP];
+            pixel |= rgba[i][RCOMP] << 8;
+            *ptr4 = pixel;
+            break;
+         case 3:
+            pixel = rgba[i][BCOMP];
+            pixel |= rgba[i][GCOMP] << 8;
+            pixel |= rgba[i++][RCOMP] << 16;
+            pixel |= rgba[i][BCOMP] << 24;
+            *ptr4++ = pixel;
+            pixel = rgba[i][GCOMP];
+            pixel |= rgba[i++][RCOMP] << 8;
+            pixel |= rgba[i][BCOMP] << 16;
+            pixel |= rgba[i][GCOMP] << 24;
+            *ptr4++ = pixel;
+            pixel = *ptr4 & 0xffffff00;
+            pixel |= rgba[i][RCOMP];
+            *ptr4 = pixel;
+            break;
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_8R8G8B-format pixels to an ximage (no alpha).
+ */
+static void write_span_rgb_8R8G8B_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            ptr[i] = PACK_8R8G8B(rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++) {
+         ptr[i] = PACK_8R8G8B(rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_8R8G8B24-format pixels to an ximage (no alpha).
+ */
+static void write_span_rgb_8R8G8B24_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte *ptr = (GLubyte *) PIXELADDR3( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            *ptr++ = rgb[i][BCOMP];
+            *ptr++ = rgb[i][GCOMP];
+            *ptr++ = rgb[i][RCOMP];
+         }
+         else {
+            ptr += 3;
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++) {
+         *ptr++ = rgb[i][BCOMP];
+         *ptr++ = rgb[i][GCOMP];
+         *ptr++ = rgb[i][RCOMP];
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_5R6G5B-format pixels to an ximage.
+ */
+static void write_span_5R6G5B_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            ptr[i] = PACK_5R6G5B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+#if defined(__i386__) /* word stores don't have to be on 4-byte boundaries */
+      GLuint *ptr32 = (GLuint *) ptr;
+      GLuint extraPixel = (n & 1);
+      n -= extraPixel;
+      for (i = 0; i < n; i += 2) {
+         GLuint p0, p1;
+         p0 = PACK_5R6G5B(rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+         p1 = PACK_5R6G5B(rgba[i+1][RCOMP], rgba[i+1][GCOMP], rgba[i+1][BCOMP]);
+         *ptr32++ = (p1 << 16) | p0;
+      }
+      if (extraPixel) {
+         ptr[n] = PACK_5R6G5B(rgba[n][RCOMP], rgba[n][GCOMP], rgba[n][BCOMP]);
+      }
+#else
+      for (i = 0; i < n; i++) {
+         ptr[i] = PACK_5R6G5B(rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+      }
+#endif
+   }
+}
+
+
+/*
+ * Write a span of PF_DITHER_5R6G5B-format pixels to an ximage.
+ */
+static void write_span_DITHER_5R6G5B_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x, y );
+   const GLint y2 = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            PACK_TRUEDITHER( ptr[i], x, y2, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+#if defined(__i386__) /* word stores don't have to be on 4-byte boundaries */
+      GLuint *ptr32 = (GLuint *) ptr;
+      GLuint extraPixel = (n & 1);
+      n -= extraPixel;
+      for (i = 0; i < n; i += 2, x += 2) {
+         GLuint p0, p1;
+         PACK_TRUEDITHER( p0, x, y2, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+         PACK_TRUEDITHER( p1, x+1, y2, rgba[i+1][RCOMP], rgba[i+1][GCOMP], rgba[i+1][BCOMP] );
+         *ptr32++ = (p1 << 16) | p0;
+      }
+      if (extraPixel) {
+         PACK_TRUEDITHER( ptr[n], x+n, y2, rgba[n][RCOMP], rgba[n][GCOMP], rgba[n][BCOMP]);
+      }
+#else
+      for (i = 0; i < n; i++, x++) {
+         PACK_TRUEDITHER( ptr[i], x, y2, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+      }
+#endif
+   }
+}
+
+
+/*
+ * Write a span of PF_5R6G5B-format pixels to an ximage (no alpha).
+ */
+static void write_span_rgb_5R6G5B_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            ptr[i] = PACK_5R6G5B( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+#if defined(__i386__) /* word stores don't have to be on 4-byte boundaries */
+      GLuint *ptr32 = (GLuint *) ptr;
+      GLuint extraPixel = (n & 1);
+      n -= extraPixel;
+      for (i = 0; i < n; i += 2) {
+         GLuint p0, p1;
+         p0 = PACK_5R6G5B(rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+         p1 = PACK_5R6G5B(rgb[i+1][RCOMP], rgb[i+1][GCOMP], rgb[i+1][BCOMP]);
+         *ptr32++ = (p1 << 16) | p0;
+      }
+      if (extraPixel) {
+         ptr[n] = PACK_5R6G5B(rgb[n][RCOMP], rgb[n][GCOMP], rgb[n][BCOMP]);
+      }
+#else
+      for (i=0;i<n;i++) {
+         ptr[i] = PACK_5R6G5B( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+      }
+#endif
+   }
+}
+
+
+/*
+ * Write a span of PF_DITHER_5R6G5B-format pixels to an ximage (no alpha).
+ */
+static void write_span_rgb_DITHER_5R6G5B_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            PACK_TRUEDITHER( ptr[i], x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+#if defined(__i386__) /* word stores don't have to be on 4-byte boundaries */
+      GLuint *ptr32 = (GLuint *) ptr;
+      GLuint extraPixel = (n & 1);
+      n -= extraPixel;
+      for (i = 0; i < n; i += 2, x += 2) {
+         GLuint p0, p1;
+         PACK_TRUEDITHER( p0, x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+         PACK_TRUEDITHER( p1, x+1, y, rgb[i+1][RCOMP], rgb[i+1][GCOMP], rgb[i+1][BCOMP] );
+         *ptr32++ = (p1 << 16) | p0;
+      }
+      if (extraPixel) {
+         PACK_TRUEDITHER( ptr[n], x+n, y, rgb[n][RCOMP], rgb[n][GCOMP], rgb[n][BCOMP]);
+      }
+#else
+      for (i=0;i<n;i++,x++) {
+         PACK_TRUEDITHER( ptr[i], x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+      }
+#endif
+   }
+}
+
+
+/*
+ * Write a span of PF_DITHER pixels to an XImage.
+ */
+static void write_span_DITHER_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   int yy = FLIP(xmesa->xm_buffer, y);
+   XDITHER_SETUP(yy);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaPutPixel( img, x, yy, XDITHER( x, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         XMesaPutPixel( img, x, yy, XDITHER( x, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_DITHER pixels to an XImage (no alpha).
+ */
+static void write_span_rgb_DITHER_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   int yy = FLIP(xmesa->xm_buffer, y);
+   XDITHER_SETUP(yy);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaPutPixel( img, x, yy, XDITHER( x, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] ) );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         XMesaPutPixel( img, x, yy, XDITHER( x, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] ) );
+      }
+   }
+}
+
+
+
+/*
+ * Write a span of 8-bit PF_DITHER pixels to an XImage.
+ */
+static void write_span_DITHER8_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
+   XDITHER_SETUP(y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            ptr[i] = (GLubyte) XDITHER( x, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+         }
+      }
+   }
+   else {
+      for (i=0;i<n;i++,x++) {
+         ptr[i] = (GLubyte) XDITHER( x, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+   }
+}
+
+
+static void write_span_rgb_DITHER8_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
+   XDITHER_SETUP(y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            ptr[i] = (GLubyte) XDITHER( x, rgb[i][0], rgb[i][1], rgb[i][2] );
+         }
+      }
+   }
+   else {
+      const GLubyte *data = (GLubyte *) rgb;
+      for (i=0;i<n;i++,x++) {
+         /*ptr[i] = XDITHER( x, rgb[i][0], rgb[i][1], rgb[i][2] );*/
+         ptr[i] = (GLubyte) XDITHER( x, data[i+i+i], data[i+i+i+1], data[i+i+i+2] );
+      }
+   }
+}
+
+
+
+/*
+ * Write a span of PF_1BIT pixels to an XImage.
+ */
+static void write_span_1BIT_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   SETUP_1BIT;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaPutPixel(img, x, y, DITHER_1BIT(x, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]));
+         }
+      }
+   }
+   else {
+      for (i=0;i<n;i++,x++) {
+         XMesaPutPixel( img, x, y, DITHER_1BIT(x, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]) );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_1BIT pixels to an XImage (no alpha).
+ */
+static void write_span_rgb_1BIT_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   SETUP_1BIT;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaPutPixel(img, x, y, DITHER_1BIT(x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]));
+         }
+      }
+   }
+   else {
+      for (i=0;i<n;i++,x++) {
+         XMesaPutPixel( img, x, y, DITHER_1BIT(x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]) );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_HPCR pixels to an XImage.
+ */
+static void write_span_HPCR_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            ptr[i] = DITHER_HPCR( x, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         ptr[i] = DITHER_HPCR( x, y, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_HPCR pixels to an XImage (no alpha).
+ */
+static void write_span_rgb_HPCR_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            ptr[i] = DITHER_HPCR( x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         ptr[i] = DITHER_HPCR( x, y, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_LOOKUP pixels to an XImage.
+ */
+static void write_span_LOOKUP_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   LOOKUP_SETUP;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaPutPixel( img, x, y, LOOKUP( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         XMesaPutPixel( img, x, y, LOOKUP( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_LOOKUP pixels to an XImage (no alpha).
+ */
+static void write_span_rgb_LOOKUP_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   LOOKUP_SETUP;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaPutPixel( img, x, y, LOOKUP( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] ) );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         XMesaPutPixel( img, x, y, LOOKUP( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] ) );
+      }
+   }
+}
+
+
+/*
+ * Write a span of 8-bit PF_LOOKUP pixels to an XImage.
+ */
+static void write_span_LOOKUP8_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
+   LOOKUP_SETUP;
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            ptr[i] = (GLubyte) LOOKUP( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         ptr[i] = (GLubyte) LOOKUP( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+   }
+}
+
+
+static void write_rgb_LOOKUP8_ximage( const GLcontext *ctx,
+                                      GLuint n, GLint x, GLint y,
+                                      CONST GLubyte rgb[][3],
+                                      const GLubyte mask[] )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
+   LOOKUP_SETUP;
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            ptr[i] = (GLubyte) LOOKUP( rgb[i][0], rgb[i][1], rgb[i][2] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      const GLubyte *data = (GLubyte *) rgb;
+      for (i=0;i<n;i++,x++) {
+         /*ptr[i] = LOOKUP( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );*/
+         ptr[i] = (GLubyte) LOOKUP( data[i+i+i], data[i+i+i+1], data[i+i+i+2] );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_GRAYSCALE pixels to an XImage.
+ */
+static void write_span_GRAYSCALE_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaPutPixel( img, x, y, GRAY_RGB( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         XMesaPutPixel( img, x, y, GRAY_RGB( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_GRAYSCALE pixels to an XImage (no alpha).
+ */
+static void write_span_rgb_GRAYSCALE_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaPutPixel( img, x, y, GRAY_RGB( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] ) );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++,x++) {
+         XMesaPutPixel( img, x, y, GRAY_RGB( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] ) );
+      }
+   }
+}
+
+
+/*
+ * Write a span of 8-bit PF_GRAYSCALE pixels to an XImage.
+ */
+static void write_span_GRAYSCALE8_ximage( RGBA_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            ptr[i] = (GLubyte) GRAY_RGB( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++) {
+         ptr[i] = (GLubyte) GRAY_RGB( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write a span of 8-bit PF_GRAYSCALE pixels to an XImage (no alpha).
+ */
+static void write_span_rgb_GRAYSCALE8_ximage( RGB_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x, y );
+   if (mask) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            ptr[i] = (GLubyte) GRAY_RGB( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0;i<n;i++) {
+         ptr[i] = (GLubyte) GRAY_RGB( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+      }
+   }
+}
+
+
+
+
+/**********************************************************************/
+/*** Write COLOR PIXEL functions                                    ***/
+/**********************************************************************/
+
+
+#define RGBA_PIXEL_ARGS   const GLcontext *ctx,				\
+			  GLuint n, const GLint x[], const GLint y[],	\
+			  CONST GLubyte rgba[][4], const GLubyte mask[]
+
+
+/*
+ * Write an array of PF_TRUECOLOR pixels to a pixmap.
+ */
+static void write_pixels_TRUECOLOR_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         unsigned long p;
+         PACK_TRUECOLOR( p, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+	 XMesaSetForeground( dpy, gc, p );
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_TRUEDITHER pixels to a pixmap.
+ */
+static void write_pixels_TRUEDITHER_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         unsigned long p;
+         PACK_TRUEDITHER(p, x[i], y[i], rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+         XMesaSetForeground( dpy, gc, p );
+         XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_8A8B8G8R pixels to a pixmap.
+ */
+static void write_pixels_8A8B8G8R_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaSetForeground( dpy, gc,
+                         PACK_8A8B8G8R( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] ));
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+/*
+ * Write an array of PF_8A8R8G8B pixels to a pixmap.
+ */
+static void write_pixels_8A8R8G8B_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaSetForeground( dpy, gc,
+                         PACK_8A8R8G8B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] ));
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+/*
+ * Write an array of PF_8R8G8B pixels to a pixmap.
+ */
+static void write_pixels_8R8G8B_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaSetForeground( dpy, gc, PACK_8R8G8B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_8R8G8B24 pixels to a pixmap.
+ */
+static void write_pixels_8R8G8B24_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaSetForeground( dpy, gc, PACK_8R8G8B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_5R6G5B pixels to a pixmap.
+ */
+static void write_pixels_5R6G5B_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaSetForeground( dpy, gc, PACK_5R6G5B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_DITHER_5R6G5B pixels to a pixmap.
+ */
+static void write_pixels_DITHER_5R6G5B_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         unsigned long p;
+         PACK_TRUEDITHER(p, x[i], y[i], rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+	 XMesaSetForeground( dpy, gc, p );
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_DITHER pixels to a pixmap.
+ */
+static void write_pixels_DITHER_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   DITHER_SETUP;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaSetForeground( dpy, gc,
+                         DITHER(x[i], y[i], rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]) );
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_1BIT pixels to a pixmap.
+ */
+static void write_pixels_1BIT_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   SETUP_1BIT;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaSetForeground( dpy, gc,
+                         DITHER_1BIT( x[i], y[i], rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ));
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_HPCR pixels to a pixmap.
+ */
+static void write_pixels_HPCR_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         XMesaSetForeground( dpy, gc,
+                         DITHER_HPCR( x[i], y[i], rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ));
+         XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_LOOKUP pixels to a pixmap.
+ */
+static void write_pixels_LOOKUP_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   LOOKUP_SETUP;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         XMesaSetForeground( dpy, gc, LOOKUP( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+         XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_GRAYSCALE pixels to a pixmap.
+ */
+static void write_pixels_GRAYSCALE_pixmap( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         XMesaSetForeground( dpy, gc, GRAY_RGB( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+         XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_TRUECOLOR pixels to an ximage.
+ */
+static void write_pixels_TRUECOLOR_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         unsigned long p;
+         PACK_TRUECOLOR( p, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]), p );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_TRUEDITHER pixels to an XImage.
+ */
+static void write_pixels_TRUEDITHER_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         unsigned long p;
+         PACK_TRUEDITHER(p, x[i], y[i], rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]), p );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_8A8B8G8R pixels to an ximage.
+ */
+static void write_pixels_8A8B8G8R_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x[i], y[i] );
+         *ptr = PACK_8A8B8G8R( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] );
+      }
+   }
+}
+
+/*
+ * Write an array of PF_8A8R8G8B pixels to an ximage.
+ */
+static void write_pixels_8A8R8G8B_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x[i], y[i] );
+         *ptr = PACK_8A8R8G8B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_8R8G8B pixels to an ximage.
+ */
+static void write_pixels_8R8G8B_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x[i], y[i] );
+         *ptr = PACK_8R8G8B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_8R8G8B24 pixels to an ximage.
+ */
+static void write_pixels_8R8G8B24_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 bgr_t *ptr = PIXELADDR3( xmesa->xm_buffer, x[i], y[i] );
+         ptr->r = rgba[i][RCOMP];
+         ptr->g = rgba[i][GCOMP];
+         ptr->b = rgba[i][BCOMP];
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_5R6G5B pixels to an ximage.
+ */
+static void write_pixels_5R6G5B_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x[i], y[i] );
+         *ptr = PACK_5R6G5B( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_DITHER_5R6G5B pixels to an ximage.
+ */
+static void write_pixels_DITHER_5R6G5B_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x[i], y[i] );
+         PACK_TRUEDITHER( *ptr, x[i], y[i], rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_DITHER pixels to an XImage.
+ */
+static void write_pixels_DITHER_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   DITHER_SETUP;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]),
+                    DITHER( x[i], y[i], rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of 8-bit PF_DITHER pixels to an XImage.
+ */
+static void write_pixels_DITHER8_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   DITHER_SETUP;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x[i],y[i]);
+	 *ptr = (GLubyte) DITHER( x[i], y[i], rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_1BIT pixels to an XImage.
+ */
+static void write_pixels_1BIT_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   SETUP_1BIT;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]),
+                    DITHER_1BIT( x[i], y[i], rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ));
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_HPCR pixels to an XImage.
+ */
+static void write_pixels_HPCR_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x[i],y[i]);
+         *ptr = (GLubyte) DITHER_HPCR( x[i], y[i], rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_LOOKUP pixels to an XImage.
+ */
+static void write_pixels_LOOKUP_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   LOOKUP_SETUP;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]), LOOKUP(rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of 8-bit PF_LOOKUP pixels to an XImage.
+ */
+static void write_pixels_LOOKUP8_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   LOOKUP_SETUP;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x[i],y[i]);
+	 *ptr = (GLubyte) LOOKUP( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_GRAYSCALE pixels to an XImage.
+ */
+static void write_pixels_GRAYSCALE_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]),
+                    GRAY_RGB( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] ) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of 8-bit PF_GRAYSCALE pixels to an XImage.
+ */
+static void write_pixels_GRAYSCALE8_ximage( RGBA_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer, x[i], y[i] );
+	 *ptr = (GLubyte) GRAY_RGB( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+      }
+   }
+}
+
+
+
+
+/**********************************************************************/
+/*** Write MONO COLOR SPAN functions                                ***/
+/**********************************************************************/
+
+#define MONO_SPAN_ARGS	const GLcontext *ctx,	\
+		 	GLuint n, GLint x, GLint y, const GLchan color[4], \
+                        const GLubyte mask[]
+
+
+/*
+ * Write a span of identical pixels to a pixmap.
+ */
+static void write_span_mono_pixmap( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   const unsigned long pixel = xmesa_color_to_pixel(xmesa, color[RCOMP],
+               color[GCOMP], color[BCOMP], color[ACOMP], xmesa->pixelformat);
+   register GLuint i;
+   XMesaSetForeground( xmesa->display, gc, pixel );
+   y = FLIP(xmesa->xm_buffer, y);
+
+   /* New code contributed by Jeff Epler and cleaned up by Keith
+    * Whitwell.  
+    */
+   for (i = 0; i < n; ) {
+      GLuint start = i;
+
+      /* Identify and emit contiguous rendered pixels
+       */
+      while (i < n && (!mask || mask[i]))
+	 i++;
+
+      if (start < i) 
+	 XMesaFillRectangle( dpy, buffer, gc,
+			     (int)(x+start), (int) y,
+			     (int)(i-start), 1);
+
+      /* Eat up non-rendered pixels
+       */
+      while (i < n && !mask[i])
+	 i++;
+   }
+}
+
+
+
+static void write_span_mono_index_pixmap( const GLcontext *ctx, GLuint n,
+                                          GLint x, GLint y, GLuint colorIndex,
+                                          const GLubyte mask[] )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   XMesaSetForeground( xmesa->display, gc, colorIndex );
+   y = FLIP(xmesa->xm_buffer, y);
+
+   for (i = 0 ; i < n ;) {
+      GLuint start = i;
+      
+      /* Identify and emit contiguous rendered pixels 
+       */
+      while (i < n && mask[i])
+	 i++;
+
+      if (start < i) 
+	 XMesaFillRectangle( dpy, buffer, gc, 
+			     (int)(x+start), (int) y, 
+			     (int)(i-start), 1);
+
+      /* Eat up non-rendered pixels
+       */
+      while (i < n && !mask[i])
+	 i++;
+   }
+}
+
+
+
+/*
+ * Write a span of PF_TRUEDITHER pixels to a pixmap.
+ */
+static void write_span_mono_TRUEDITHER_pixmap( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   register GLuint i;
+   int yy = FLIP(xmesa->xm_buffer, y);
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+         unsigned long p;
+         PACK_TRUEDITHER(p, x, yy, r, g, b);
+         XMesaSetForeground( dpy, gc, p );
+         XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) yy );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_DITHER pixels to a pixmap.
+ */
+static void write_span_mono_DITHER_pixmap( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   register GLuint i;
+   int yy = FLIP(xmesa->xm_buffer, y);
+   XDITHER_SETUP(yy);
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+         XMesaSetForeground( dpy, gc, XDITHER( x, r, g, b ) );
+         XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) yy );
+      }
+   }
+}
+
+
+/*
+ * Write a span of PF_1BIT pixels to a pixmap.
+ */
+static void write_span_mono_1BIT_pixmap( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   register GLuint i;
+   SETUP_1BIT;
+   y = FLIP(xmesa->xm_buffer, y);
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+         XMesaSetForeground( dpy, gc, DITHER_1BIT( x, y, r, g, b ) );
+         XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+      }
+   }
+}
+
+
+/*
+ * Write a span of identical pixels to an XImage.
+ */
+static void write_span_mono_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   const unsigned long pixel = xmesa_color_to_pixel(xmesa, color[RCOMP],
+               color[GCOMP], color[BCOMP], color[ACOMP], xmesa->pixelformat);
+   y = FLIP(xmesa->xm_buffer, y);
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x, y, pixel );
+      }
+   }
+}
+
+
+static void write_span_mono_index_ximage( const GLcontext *ctx, GLuint n,
+                                          GLint x, GLint y,
+                                          GLuint colorIndex,
+                                          const GLubyte mask[] )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x, y, colorIndex );
+      }
+   }
+}
+
+
+/*
+ * Write a span of identical PF_TRUEDITHER pixels to an XImage.
+ */
+static void write_span_mono_TRUEDITHER_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   const GLint r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         unsigned long p;
+         PACK_TRUEDITHER( p, x+i, y, r, g, b);
+	 XMesaPutPixel( img, x+i, y, p );
+      }
+   }
+}
+
+
+/*
+ * Write a span of identical 8A8B8G8R pixels to an XImage.
+ */
+static void write_span_mono_8A8B8G8R_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GLuint i, *ptr;
+   const unsigned long pixel = xmesa_color_to_pixel(xmesa, color[RCOMP],
+               color[GCOMP], color[BCOMP], color[ACOMP], xmesa->pixelformat);
+   ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 ptr[i] = pixel;
+      }
+   }
+}
+
+/*
+ * Write a span of identical 8A8R8G8B pixels to an XImage.
+ */
+static void write_span_mono_8A8R8G8B_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GLuint i, *ptr;
+   const unsigned long pixel = xmesa_color_to_pixel(xmesa, color[RCOMP],
+               color[GCOMP], color[BCOMP], color[ACOMP], xmesa->pixelformat);
+   ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 ptr[i] = pixel;
+      }
+   }
+}
+
+
+/*
+ * Write a span of identical 8R8G8B pixels to an XImage.
+ */
+static void write_span_mono_8R8G8B_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLuint pixel = PACK_8R8G8B(color[RCOMP], color[GCOMP], color[BCOMP]);
+   GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x, y );
+   GLuint i;
+   for (i=0;i<n;i++) {
+      if (!mask || mask[i]) {
+	 ptr[i] = pixel;
+      }
+   }
+}
+
+
+/*
+ * Write a span of identical 8R8G8B pixels to an XImage.
+ */
+static void write_span_mono_8R8G8B24_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte r = color[RCOMP];
+   const GLubyte g = color[GCOMP];
+   const GLubyte b = color[BCOMP];
+   GLuint i;
+   bgr_t *ptr = PIXELADDR3( xmesa->xm_buffer, x, y );
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         ptr[i].r = r;
+         ptr[i].g = g;
+         ptr[i].b = b;
+      }
+   }
+}
+
+
+/*
+ * Write a span of identical DITHER pixels to an XImage.
+ */
+static void write_span_mono_DITHER_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   int yy = FLIP(xmesa->xm_buffer, y);
+   register GLuint i;
+   XDITHER_SETUP(yy);
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x, yy, XDITHER( x, r, g, b ) );
+      }
+   }
+}
+
+
+/*
+ * Write a span of identical 8-bit DITHER pixels to an XImage.
+ */
+static void write_span_mono_DITHER8_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x,y);
+   register GLuint i;
+   XDITHER_SETUP(y);
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+	 ptr[i] = (GLubyte) XDITHER( x, r, g, b );
+      }
+   }
+}
+
+
+/*
+ * Write a span of identical 8-bit LOOKUP pixels to an XImage.
+ */
+static void write_span_mono_LOOKUP8_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x,y);
+   GLubyte pixel;
+   LOOKUP_SETUP;
+   pixel = LOOKUP(color[RCOMP], color[GCOMP], color[BCOMP]);
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 ptr[i] = pixel;
+      }
+   }
+}
+
+
+/*
+ * Write a span of identical PF_1BIT pixels to an XImage.
+ */
+static void write_span_mono_1BIT_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   SETUP_1BIT;
+   y = FLIP(xmesa->xm_buffer, y);
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x, y, DITHER_1BIT( x, y, r, g, b ) );
+      }
+   }
+}
+
+
+/*
+ * Write a span of identical HPCR pixels to an XImage.
+ */
+static void write_span_mono_HPCR_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   register GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x,y);
+   register GLuint i;
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+         ptr[i] = DITHER_HPCR( x, y, r, g, b );
+      }
+   }
+}
+
+
+/*
+ * Write a span of identical 8-bit GRAYSCALE pixels to an XImage.
+ */
+static void write_span_mono_GRAYSCALE8_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte p = GRAY_RGB(color[RCOMP], color[GCOMP], color[BCOMP]);
+   GLubyte *ptr = (GLubyte *) PIXELADDR1( xmesa->xm_buffer,x,y);
+   GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 ptr[i] = p;
+      }
+   }
+}
+
+
+
+/*
+ * Write a span of identical PF_DITHER_5R6G5B pixels to an XImage.
+ */
+static void write_span_mono_DITHER_5R6G5B_ximage( MONO_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x, y );
+   const GLint r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         PACK_TRUEDITHER(ptr[i], x+i, y, r, g, b);
+      }
+   }
+}
+
+
+
+/**********************************************************************/
+/*** Write MONO COLOR PIXELS functions                              ***/
+/**********************************************************************/
+
+#define MONO_PIXEL_ARGS	const GLcontext *ctx,				\
+			GLuint n, const GLint x[], const GLint y[],	\
+			const GLchan color[4], const GLubyte mask[]
+
+/*
+ * Write an array of identical pixels to a pixmap.
+ */
+static void write_pixels_mono_pixmap( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   const unsigned long pixel = xmesa_color_to_pixel(xmesa, color[RCOMP],
+               color[GCOMP], color[BCOMP], color[ACOMP], xmesa->pixelformat);
+   XMesaSetForeground( xmesa->display, gc, pixel );
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaDrawPoint( dpy, buffer, gc,
+                         (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+static void write_pixels_mono_index_pixmap(const GLcontext *ctx,
+                                           GLuint n,
+                                           const GLint x[], const GLint y[],
+                                           GLuint colorIndex,
+                                           const GLubyte mask[] )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   XMesaSetForeground( xmesa->display, gc, colorIndex );
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaDrawPoint( dpy, buffer, gc,
+                         (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_TRUEDITHER pixels to a pixmap.
+ */
+static void write_pixels_mono_TRUEDITHER_pixmap( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         unsigned long p;
+         PACK_TRUEDITHER(p, x[i], y[i], r, g, b);
+         XMesaSetForeground( dpy, gc, p );
+	 XMesaDrawPoint( dpy, buffer, gc,
+                         (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_DITHER pixels to a pixmap.
+ */
+static void write_pixels_mono_DITHER_pixmap( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   DITHER_SETUP;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         XMesaSetForeground( dpy, gc, DITHER( x[i], y[i], r, g, b ) );
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of PF_1BIT pixels to a pixmap.
+ */
+static void write_pixels_mono_1BIT_pixmap( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   SETUP_1BIT;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         XMesaSetForeground( dpy, gc, DITHER_1BIT( x[i], y[i], r, g, b ) );
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of identical pixels to an XImage.
+ */
+static void write_pixels_mono_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   const unsigned long pixel = xmesa_color_to_pixel(xmesa, color[RCOMP],
+               color[GCOMP], color[BCOMP], color[ACOMP], xmesa->pixelformat);
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]), pixel );
+      }
+   }
+}
+
+
+static void write_pixels_mono_index_ximage( const GLcontext *ctx, GLuint n,
+                                            const GLint x[], const GLint y[],
+                                            GLuint colorIndex,
+                                            const GLubyte mask[] )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]), colorIndex );
+      }
+   }
+}
+
+
+/*
+ * Write an array of identical TRUEDITHER pixels to an XImage.
+ */
+static void write_pixels_mono_TRUEDITHER_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   const int r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         unsigned long p;
+         PACK_TRUEDITHER(p, x[i], FLIP(xmesa->xm_buffer, y[i]), r, g, b);
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]), p );
+      }
+   }
+}
+
+
+
+/*
+ * Write an array of identical 8A8B8G8R pixels to an XImage
+ */
+static void write_pixels_mono_8A8B8G8R_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLuint p = PACK_8A8B8G8R(color[RCOMP], color[GCOMP],
+                                  color[BCOMP], color[ACOMP]);
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x[i], y[i] );
+	 *ptr = p;
+      }
+   }
+}
+
+/*
+ * Write an array of identical 8A8R8G8B pixels to an XImage
+ */
+static void write_pixels_mono_8A8R8G8B_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLuint p = PACK_8A8R8G8B(color[RCOMP], color[GCOMP],
+                                  color[BCOMP], color[ACOMP]);
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x[i], y[i] );
+	 *ptr = p;
+      }
+   }
+}
+
+/*
+ * Write an array of identical 8R8G8B pixels to an XImage.
+ */
+static void write_pixels_mono_8R8G8B_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   const GLuint p = PACK_8R8G8B(color[RCOMP], color[GCOMP], color[BCOMP]);
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLuint *ptr = PIXELADDR4( xmesa->xm_buffer, x[i], y[i] );
+	 *ptr = p;
+      }
+   }
+}
+
+
+/*
+ * Write an array of identical 8R8G8B pixels to an XImage.
+ */
+static void write_pixels_mono_8R8G8B24_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 bgr_t *ptr = PIXELADDR3( xmesa->xm_buffer, x[i], y[i] );
+         ptr->r = r;
+         ptr->g = g;
+         ptr->b = b;
+      }
+   }
+}
+
+
+/*
+ * Write an array of identical PF_DITHER pixels to an XImage.
+ */
+static void write_pixels_mono_DITHER_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   DITHER_SETUP;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]), DITHER( x[i], y[i], r, g, b ) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of identical 8-bit PF_DITHER pixels to an XImage.
+ */
+static void write_pixels_mono_DITHER8_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   register GLuint i;
+   DITHER_SETUP;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x[i],y[i]);
+	 *ptr = (GLubyte) DITHER( x[i], y[i], r, g, b );
+      }
+   }
+}
+
+
+/*
+ * Write an array of identical 8-bit PF_LOOKUP pixels to an XImage.
+ */
+static void write_pixels_mono_LOOKUP8_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   GLubyte pixel;
+   LOOKUP_SETUP;
+   pixel = LOOKUP(color[RCOMP], color[GCOMP], color[BCOMP]);
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x[i],y[i]);
+	 *ptr = pixel;
+      }
+   }
+}
+
+
+
+/*
+ * Write an array of identical PF_1BIT pixels to an XImage.
+ */
+static void write_pixels_mono_1BIT_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   SETUP_1BIT;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]),
+                        DITHER_1BIT( x[i], y[i], r, g, b ));
+      }
+   }
+}
+
+
+/*
+ * Write an array of identical PF_HPCR pixels to an XImage.
+ */
+static void write_pixels_mono_HPCR_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const GLubyte r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+         GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x[i],y[i]);
+         *ptr = DITHER_HPCR( x[i], y[i], r, g, b );
+      }
+   }
+}
+
+
+/*
+ * Write an array of identical 8-bit PF_GRAYSCALE pixels to an XImage.
+ */
+static void write_pixels_mono_GRAYSCALE8_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   register GLubyte p = GRAY_RGB(color[RCOMP], color[GCOMP], color[BCOMP]);
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLubyte *ptr = PIXELADDR1( xmesa->xm_buffer,x[i],y[i]);
+	 *ptr = p;
+      }
+   }
+}
+
+
+/*
+ * Write an array of identical PF_DITHER_5R6G5B pixels to an XImage.
+ */
+static void write_pixels_mono_DITHER_5R6G5B_ximage( MONO_PIXEL_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   const int r = color[RCOMP], g = color[GCOMP], b = color[BCOMP];
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 GLushort *ptr = PIXELADDR2( xmesa->xm_buffer, x[i], y[i] );
+         PACK_TRUEDITHER(*ptr, x[i], y[i], r, g, b);
+      }
+   }
+}
+
+
+
+/**********************************************************************/
+/*** Write INDEX SPAN functions                                     ***/
+/**********************************************************************/
+
+#define INDEX_SPAN_ARGS	const GLcontext *ctx,				\
+			GLuint n, GLint x, GLint y, const GLuint index[], \
+			const GLubyte mask[]
+
+#define INDEX8_SPAN_ARGS const GLcontext *ctx,				\
+			 GLuint n, GLint x, GLint y, const GLubyte index[], \
+			 const GLubyte mask[]
+
+
+/*
+ * Write a span of CI pixels to a Pixmap.
+ */
+static void write_span_index_pixmap( INDEX_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, (unsigned long) index[i] );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      for (i=0;i<n;i++,x++) {
+         XMesaSetForeground( dpy, gc, (unsigned long) index[i] );
+         XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+      }
+   }
+}
+
+
+/*
+ * Write a span of 8-bit CI pixels to a Pixmap.
+ */
+static void write_span_index8_pixmap( INDEX8_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaSetForeground( dpy, gc, (unsigned long) index[i] );
+            XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+         }
+      }
+   }
+   else {
+      for (i=0;i<n;i++,x++) {
+         XMesaSetForeground( dpy, gc, (unsigned long) index[i] );
+         XMesaDrawPoint( dpy, buffer, gc, (int) x, (int) y );
+      }
+   }
+}
+
+
+/*
+ * Write a span of CI pixels to an XImage.
+ */
+static void write_span_index_ximage( INDEX_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   y = FLIP(xmesa->xm_buffer, y);
+   if (mask) {
+      for (i=0;i<n;i++,x++) {
+         if (mask[i]) {
+            XMesaPutPixel( img, x, y, (unsigned long) index[i] );
+         }
+      }
+   }
+   else {
+      for (i=0;i<n;i++,x++) {
+         XMesaPutPixel( img, x, y, (unsigned long) index[i] );
+      }
+   }
+}
+
+
+/*
+ * Write a span of 8-bit CI pixels to a non 8-bit XImage.
+ */
+static void write_span_index8_ximage( INDEX8_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   if (mask) {
+      GLuint i;
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            XMesaPutPixel(xmesa->xm_buffer->backimage, x+i, y, index[i]);
+         }
+      }
+   }
+   else {
+      GLuint i;
+      for (i=0;i<n;i++) {
+         XMesaPutPixel(xmesa->xm_buffer->backimage, x+i, y, index[i]);
+      }
+   }
+}
+
+/*
+ * Write a span of 8-bit CI pixels to an 8-bit XImage.
+ */
+static void write_span_index8_ximage8( INDEX8_SPAN_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GLubyte *dst = PIXELADDR1( xmesa->xm_buffer,x,y);
+   if (mask) {
+      GLuint i;
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            dst[i] = index[i];
+         }
+      }
+   }
+   else {
+      MEMCPY( dst, index, n );
+   }
+}
+
+
+
+/**********************************************************************/
+/*** Write INDEX PIXELS functions                                   ***/
+/**********************************************************************/
+
+#define INDEX_PIXELS_ARGS	const GLcontext *ctx,			\
+				GLuint n, const GLint x[], const GLint y[], \
+				const GLuint index[], const GLubyte mask[]
+
+
+/*
+ * Write an array of CI pixels to a Pixmap.
+ */
+static void write_pixels_index_pixmap( INDEX_PIXELS_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   XMesaDrawable buffer = xmesa->xm_buffer->buffer;
+   XMesaGC gc = xmesa->xm_buffer->gc;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaSetForeground( dpy, gc, (unsigned long) index[i] );
+	 XMesaDrawPoint( dpy, buffer, gc, (int) x[i], (int) FLIP(xmesa->xm_buffer, y[i]) );
+      }
+   }
+}
+
+
+/*
+ * Write an array of CI pixels to an XImage.
+ */
+static void write_pixels_index_ximage( INDEX_PIXELS_ARGS )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaImage *img = xmesa->xm_buffer->backimage;
+   register GLuint i;
+   for (i=0;i<n;i++) {
+      if (mask[i]) {
+	 XMesaPutPixel( img, x[i], FLIP(xmesa->xm_buffer, y[i]), (unsigned long) index[i] );
+      }
+   }
+}
+
+
+
+
+/**********************************************************************/
+/*****                      Pixel reading                         *****/
+/**********************************************************************/
+
+#ifndef XFree86Server
+/**
+ * Do clip testing prior to calling XGetImage.  If any of the region lies
+ * outside the screen's bounds, XGetImage will return NULL.
+ * We use XTranslateCoordinates() to check if that's the case and
+ * adjust the x, y and length parameters accordingly.
+ * \return  -1 if span is totally clipped away,
+ *          else return number of pixels to skip in the destination array.
+ */
+static int
+clip_for_xgetimage(XMesaContext xmesa, GLuint *n, GLint *x, GLint *y)
+{
+   XMesaBuffer source = xmesa->xm_buffer;
+   Window rootWin = RootWindow(xmesa->display, 0);
+   Window child;
+   int screenWidth = WidthOfScreen(DefaultScreenOfDisplay(xmesa->display));
+   int dx, dy;
+   if (source->type == PBUFFER || source->type == PIXMAP)
+      return 0;
+   XTranslateCoordinates(xmesa->display, source->buffer, rootWin,
+                         *x, *y, &dx, &dy, &child);
+   if (dx >= screenWidth) {
+      /* totally clipped on right */
+      return -1;
+   }
+   if (dx < 0) {
+      /* clipped on left */
+      int clip = -dx;
+      if (clip >= *n)
+         return -1;  /* totally clipped on left */
+      *x += clip;
+      *n -= clip;
+      dx = 0;
+      return clip;
+   }
+   if (dx + *n > screenWidth) {
+      /* clipped on right */
+      int clip = dx + *n - screenWidth;
+      *n -= clip;
+   }
+   return 0;
+}
+#endif
+
+
+/*
+ * Read a horizontal span of color-index pixels.
+ */
+static void read_index_span( const GLcontext *ctx,
+			     GLuint n, GLint x, GLint y, GLuint index[] )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaBuffer source = xmesa->xm_buffer;
+   GLuint i;
+
+   y = FLIP(source, y);
+
+   if (source->buffer) {
+#ifndef XFree86Server
+      XMesaImage *span = NULL;
+      int error;
+      int k = clip_for_xgetimage(xmesa, &n, &x, &y);
+      if (k < 0)
+         return;
+      index += k;
+
+      catch_xgetimage_errors( xmesa->display );
+      span = XGetImage( xmesa->display, source->buffer,
+		        x, y, n, 1, AllPlanes, ZPixmap );
+      error = check_xgetimage_errors();
+      if (span && !error) {
+	 for (i=0;i<n;i++) {
+	    index[i] = (GLuint) XMesaGetPixel( span, i, 0 );
+	 }
+      }
+      else {
+	 /* return 0 pixels */
+	 for (i=0;i<n;i++) {
+	    index[i] = 0;
+	 }
+      }
+      if (span) {
+	 XMesaDestroyImage( span );
+      }
+#else
+      (*xmesa->display->GetImage)(source->buffer,
+				  x, y, n, 1, ZPixmap,
+				  ~0L, (pointer)index);
+#endif
+   }
+   else if (source->backimage) {
+      XMesaImage *img = source->backimage;
+      for (i=0;i<n;i++,x++) {
+	 index[i] = (GLuint) XMesaGetPixel( img, x, y );
+      }
+   }
+}
+
+
+
+/*
+ * Read a horizontal span of color pixels.
+ */
+static void read_color_span( const GLcontext *ctx,
+			     GLuint n, GLint x, GLint y,
+                             GLubyte rgba[][4] )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaBuffer source = xmesa->xm_buffer;
+
+   if (source->buffer) {
+      /* Read from Pixmap or Window */
+      XMesaImage *span = NULL;
+      int error;
+#ifdef XFree86Server
+      span = XMesaCreateImage(xmesa->xm_visual->BitsPerPixel, n, 1, NULL);
+      span->data = (char *)MALLOC(span->height * span->bytes_per_line);
+      error = (!span->data);
+      (*xmesa->display->GetImage)(source->buffer,
+				  x, FLIP(source, y), n, 1, ZPixmap,
+				  ~0L, (pointer)span->data);
+#else
+      int k;
+      y = FLIP(source, y);
+      k = clip_for_xgetimage(xmesa, &n, &x, &y);
+      if (k < 0)
+         return;
+      rgba += k;
+      catch_xgetimage_errors( xmesa->display );
+      span = XGetImage( xmesa->display, source->buffer,
+		        x, y, n, 1, AllPlanes, ZPixmap );
+      error = check_xgetimage_errors();
+#endif
+      if (span && !error) {
+	 switch (xmesa->pixelformat) {
+	    case PF_Truecolor:
+	    case PF_Dither_True:
+               {
+                  const GLubyte *pixelToR = xmesa->xm_visual->PixelToR;
+                  const GLubyte *pixelToG = xmesa->xm_visual->PixelToG;
+                  const GLubyte *pixelToB = xmesa->xm_visual->PixelToB;
+                  unsigned long rMask = GET_REDMASK(xmesa->xm_visual);
+                  unsigned long gMask = GET_GREENMASK(xmesa->xm_visual);
+                  unsigned long bMask = GET_BLUEMASK(xmesa->xm_visual);
+                  GLint rShift = xmesa->xm_visual->rshift;
+                  GLint gShift = xmesa->xm_visual->gshift;
+                  GLint bShift = xmesa->xm_visual->bshift;
+                  GLuint i;
+                  for (i=0;i<n;i++) {
+                     unsigned long p;
+                     p = XMesaGetPixel( span, i, 0 );
+                     rgba[i][RCOMP] = pixelToR[(p & rMask) >> rShift];
+                     rgba[i][GCOMP] = pixelToG[(p & gMask) >> gShift];
+                     rgba[i][BCOMP] = pixelToB[(p & bMask) >> bShift];
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+	       break;
+            case PF_5R6G5B:
+            case PF_Dither_5R6G5B:
+               {
+                  const GLubyte *pixelToR = xmesa->xm_visual->PixelToR;
+                  const GLubyte *pixelToG = xmesa->xm_visual->PixelToG;
+                  const GLubyte *pixelToB = xmesa->xm_visual->PixelToB;
+                  GLuint i;
+                  for (i=0;i<n;i++) {
+                     unsigned long p = XMesaGetPixel( span, i, 0 );
+                     /* fast, but not quite accurate
+                     rgba[i][RCOMP] = ((p >> 8) & 0xf8);
+                     rgba[i][GCOMP] = ((p >> 3) & 0xfc);
+                     rgba[i][BCOMP] = ((p << 3) & 0xff);
+                     */
+                     rgba[i][RCOMP] = pixelToR[p >> 11];
+                     rgba[i][GCOMP] = pixelToG[(p >> 5) & 0x3f];
+                     rgba[i][BCOMP] = pixelToB[p & 0x1f];
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+	       break;
+	    case PF_8A8B8G8R:
+               {
+                  const GLuint *ptr4 = (GLuint *) span->data;
+                  GLuint i;
+                  for (i=0;i<n;i++) {
+                     GLuint p4 = *ptr4++;
+                     rgba[i][RCOMP] = (GLubyte) ( p4        & 0xff);
+                     rgba[i][GCOMP] = (GLubyte) ((p4 >> 8)  & 0xff);
+                     rgba[i][BCOMP] = (GLubyte) ((p4 >> 16) & 0xff);
+                     rgba[i][ACOMP] = (GLubyte) ((p4 >> 24) & 0xff);
+                  }
+	       }
+	       break;
+            case PF_8A8R8G8B:
+               {
+                  const GLuint *ptr4 = (GLuint *) span->data;
+                  GLuint i;
+                  for (i=0;i<n;i++) {
+                     GLuint p4 = *ptr4++;
+                     rgba[i][RCOMP] = (GLubyte) ((p4 >> 16) & 0xff);
+                     rgba[i][GCOMP] = (GLubyte) ((p4 >> 8)  & 0xff);
+                     rgba[i][BCOMP] = (GLubyte) ( p4        & 0xff);
+                     rgba[i][ACOMP] = (GLubyte) ((p4 >> 24) & 0xff);
+                  }
+	       }
+	       break;
+            case PF_8R8G8B:
+               {
+                  const GLuint *ptr4 = (GLuint *) span->data;
+                  GLuint i;
+                  for (i=0;i<n;i++) {
+                     GLuint p4 = *ptr4++;
+                     rgba[i][RCOMP] = (GLubyte) ((p4 >> 16) & 0xff);
+                     rgba[i][GCOMP] = (GLubyte) ((p4 >> 8)  & 0xff);
+                     rgba[i][BCOMP] = (GLubyte) ( p4        & 0xff);
+                     rgba[i][ACOMP] = 255;
+                  }
+	       }
+	       break;
+            case PF_8R8G8B24:
+               {
+                  const bgr_t *ptr3 = (bgr_t *) span->data;
+                  GLuint i;
+                  for (i=0;i<n;i++) {
+                     rgba[i][RCOMP] = ptr3[i].r;
+                     rgba[i][GCOMP] = ptr3[i].g;
+                     rgba[i][BCOMP] = ptr3[i].b;
+                     rgba[i][ACOMP] = 255;
+                  }
+	       }
+	       break;
+            case PF_HPCR:
+               {
+                  GLubyte *ptr1 = (GLubyte *) span->data;
+                  GLuint i;
+                  for (i=0;i<n;i++) {
+                     GLubyte p = *ptr1++;
+                     rgba[i][RCOMP] =  p & 0xE0;
+                     rgba[i][GCOMP] = (p & 0x1C) << 3;
+                     rgba[i][BCOMP] = (p & 0x03) << 6;
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+               break;
+	    case PF_Dither:
+	    case PF_Lookup:
+	    case PF_Grayscale:
+               {
+                  GLubyte *rTable = source->pixel_to_r;
+                  GLubyte *gTable = source->pixel_to_g;
+                  GLubyte *bTable = source->pixel_to_b;
+                  if (GET_VISUAL_DEPTH(xmesa->xm_visual)==8) {
+                     const GLubyte *ptr1 = (GLubyte *) span->data;
+                     GLuint i;
+                     for (i=0;i<n;i++) {
+                        unsigned long p = *ptr1++;
+                        rgba[i][RCOMP] = rTable[p];
+                        rgba[i][GCOMP] = gTable[p];
+                        rgba[i][BCOMP] = bTable[p];
+                        rgba[i][ACOMP] = 255;
+                     }
+                  }
+                  else {
+                     GLuint i;
+                     for (i=0;i<n;i++) {
+                        unsigned long p = XMesaGetPixel( span, i, 0 );
+                        rgba[i][RCOMP] = rTable[p];
+                        rgba[i][GCOMP] = gTable[p];
+                        rgba[i][BCOMP] = bTable[p];
+                        rgba[i][ACOMP] = 255;
+                     }
+                  }
+               }
+	       break;
+	    case PF_1Bit:
+               {
+                  int bitFlip = xmesa->xm_visual->bitFlip;
+                  GLuint i;
+                  for (i=0;i<n;i++) {
+                     unsigned long p;
+                     p = XMesaGetPixel( span, i, 0 ) ^ bitFlip;
+                     rgba[i][RCOMP] = (GLubyte) (p * 255);
+                     rgba[i][GCOMP] = (GLubyte) (p * 255);
+                     rgba[i][BCOMP] = (GLubyte) (p * 255);
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+	       break;
+	    default:
+	       _mesa_problem(NULL,"Problem in DD.read_color_span (1)");
+               return;
+	 }
+      }
+      else {
+	 /* return black pixels */
+         GLuint i;
+	 for (i=0;i<n;i++) {
+	    rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = rgba[i][ACOMP] = 0;
+	 }
+      }
+      if (span) {
+	 XMesaDestroyImage( span );
+      }
+   }
+   else if (source->backimage) {
+      /* Read from XImage back buffer */
+      switch (xmesa->pixelformat) {
+         case PF_Truecolor:
+         case PF_Dither_True:
+            {
+               const GLubyte *pixelToR = xmesa->xm_visual->PixelToR;
+               const GLubyte *pixelToG = xmesa->xm_visual->PixelToG;
+               const GLubyte *pixelToB = xmesa->xm_visual->PixelToB;
+               unsigned long rMask = GET_REDMASK(xmesa->xm_visual);
+               unsigned long gMask = GET_GREENMASK(xmesa->xm_visual);
+               unsigned long bMask = GET_BLUEMASK(xmesa->xm_visual);
+               GLint rShift = xmesa->xm_visual->rshift;
+               GLint gShift = xmesa->xm_visual->gshift;
+               GLint bShift = xmesa->xm_visual->bshift;
+               XMesaImage *img = source->backimage;
+               GLuint i;
+               y = FLIP(source, y);
+               for (i=0;i<n;i++) {
+                  unsigned long p;
+		  p = XMesaGetPixel( img, x+i, y );
+                  rgba[i][RCOMP] = pixelToR[(p & rMask) >> rShift];
+                  rgba[i][GCOMP] = pixelToG[(p & gMask) >> gShift];
+                  rgba[i][BCOMP] = pixelToB[(p & bMask) >> bShift];
+                  rgba[i][ACOMP] = 255;
+               }
+            }
+            break;
+         case PF_5R6G5B:
+         case PF_Dither_5R6G5B:
+            {
+               const GLubyte *pixelToR = xmesa->xm_visual->PixelToR;
+               const GLubyte *pixelToG = xmesa->xm_visual->PixelToG;
+               const GLubyte *pixelToB = xmesa->xm_visual->PixelToB;
+               const GLushort *ptr2 = PIXELADDR2( source, x, y );
+               GLuint i;
+#if defined(__i386__) /* word stores don't have to be on 4-byte boundaries */
+               const GLuint *ptr4 = (const GLuint *) ptr2;
+               GLuint extraPixel = (n & 1);
+               n -= extraPixel;
+               for (i = 0; i < n; i += 2) {
+                  const GLuint p = *ptr4++;
+                  const GLuint p0 = p & 0xffff;
+                  const GLuint p1 = p >> 16;
+                  /* fast, but not quite accurate
+                  rgba[i][RCOMP] = ((p >> 8) & 0xf8);
+                  rgba[i][GCOMP] = ((p >> 3) & 0xfc);
+                  rgba[i][BCOMP] = ((p << 3) & 0xff);
+                  */
+                  rgba[i][RCOMP] = pixelToR[p0 >> 11];
+                  rgba[i][GCOMP] = pixelToG[(p0 >> 5) & 0x3f];
+                  rgba[i][BCOMP] = pixelToB[p0 & 0x1f];
+                  rgba[i][ACOMP] = 255;
+                  rgba[i+1][RCOMP] = pixelToR[p1 >> 11];
+                  rgba[i+1][GCOMP] = pixelToG[(p1 >> 5) & 0x3f];
+                  rgba[i+1][BCOMP] = pixelToB[p1 & 0x1f];
+                  rgba[i+1][ACOMP] = 255;
+               }
+               if (extraPixel) {
+                  GLushort p = ptr2[n];
+                  rgba[n][RCOMP] = pixelToR[p >> 11];
+                  rgba[n][GCOMP] = pixelToG[(p >> 5) & 0x3f];
+                  rgba[n][BCOMP] = pixelToB[p & 0x1f];
+                  rgba[n][ACOMP] = 255;
+               }
+#else
+               for (i = 0; i < n; i++) {
+                  const GLushort p = ptr2[i];
+                  rgba[i][RCOMP] = pixelToR[p >> 11];
+                  rgba[i][GCOMP] = pixelToG[(p >> 5) & 0x3f];
+                  rgba[i][BCOMP] = pixelToB[p & 0x1f];
+                  rgba[i][ACOMP] = 255;
+               }
+#endif
+            }
+            break;
+	 case PF_8A8B8G8R:
+            {
+               const GLuint *ptr4 = PIXELADDR4( source, x, y );
+               GLuint i;
+               for (i=0;i<n;i++) {
+                  GLuint p4 = *ptr4++;
+                  rgba[i][RCOMP] = (GLubyte) ( p4        & 0xff);
+                  rgba[i][GCOMP] = (GLubyte) ((p4 >> 8)  & 0xff);
+                  rgba[i][BCOMP] = (GLubyte) ((p4 >> 16) & 0xff);
+                  rgba[i][ACOMP] = (GLint)   ((p4 >> 24) & 0xff);
+               }
+            }
+	    break;
+	 case PF_8A8R8G8B:
+            {
+               const GLuint *ptr4 = PIXELADDR4( source, x, y );
+               GLuint i;
+               for (i=0;i<n;i++) {
+                  GLuint p4 = *ptr4++;
+                  rgba[i][RCOMP] = (GLubyte) ((p4 >> 16) & 0xff);
+                  rgba[i][GCOMP] = (GLubyte) ((p4 >> 8)  & 0xff);
+                  rgba[i][BCOMP] = (GLubyte) ( p4        & 0xff);
+                  rgba[i][ACOMP] = (GLint)   ((p4 >> 24) & 0xff);
+               }
+            }
+	    break;
+	 case PF_8R8G8B:
+            {
+               const GLuint *ptr4 = PIXELADDR4( source, x, y );
+               GLuint i;
+               for (i=0;i<n;i++) {
+                  GLuint p4 = *ptr4++;
+                  rgba[i][RCOMP] = (GLubyte) ((p4 >> 16) & 0xff);
+                  rgba[i][GCOMP] = (GLubyte) ((p4 >> 8)  & 0xff);
+                  rgba[i][BCOMP] = (GLubyte) ( p4        & 0xff);
+                  rgba[i][ACOMP] = 255;
+               }
+            }
+	    break;
+	 case PF_8R8G8B24:
+            {
+               const bgr_t *ptr3 = PIXELADDR3( source, x, y );
+               GLuint i;
+               for (i=0;i<n;i++) {
+                  rgba[i][RCOMP] = ptr3[i].r;
+                  rgba[i][GCOMP] = ptr3[i].g;
+                  rgba[i][BCOMP] = ptr3[i].b;
+                  rgba[i][ACOMP] = 255;
+               }
+            }
+	    break;
+         case PF_HPCR:
+            {
+               const GLubyte *ptr1 = PIXELADDR1( source, x, y );
+               GLuint i;
+               for (i=0;i<n;i++) {
+                  GLubyte p = *ptr1++;
+                  rgba[i][RCOMP] =  p & 0xE0;
+                  rgba[i][GCOMP] = (p & 0x1C) << 3;
+                  rgba[i][BCOMP] = (p & 0x03) << 6;
+                  rgba[i][ACOMP] = 255;
+               }
+            }
+            break;
+	 case PF_Dither:
+	 case PF_Lookup:
+	 case PF_Grayscale:
+            {
+               const GLubyte *rTable = source->pixel_to_r;
+               const GLubyte *gTable = source->pixel_to_g;
+               const GLubyte *bTable = source->pixel_to_b;
+               if (GET_VISUAL_DEPTH(xmesa->xm_visual)==8) {
+                  GLubyte *ptr1 = PIXELADDR1( source, x, y );
+                  GLuint i;
+                  for (i=0;i<n;i++) {
+                     unsigned long p = *ptr1++;
+                     rgba[i][RCOMP] = rTable[p];
+                     rgba[i][GCOMP] = gTable[p];
+                     rgba[i][BCOMP] = bTable[p];
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+               else {
+                  XMesaImage *img = source->backimage;
+                  GLuint i;
+                  y = FLIP(source, y);
+                  for (i=0;i<n;i++,x++) {
+                     unsigned long p = XMesaGetPixel( img, x, y );
+                     rgba[i][RCOMP] = rTable[p];
+                     rgba[i][GCOMP] = gTable[p];
+                     rgba[i][BCOMP] = bTable[p];
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+            }
+	    break;
+	 case PF_1Bit:
+            {
+               XMesaImage *img = source->backimage;
+               int bitFlip = xmesa->xm_visual->bitFlip;
+               GLuint i;
+               y = FLIP(source, y);
+               for (i=0;i<n;i++,x++) {
+                  unsigned long p;
+		  p = XMesaGetPixel( img, x, y ) ^ bitFlip;
+                  rgba[i][RCOMP] = (GLubyte) (p * 255);
+                  rgba[i][GCOMP] = (GLubyte) (p * 255);
+                  rgba[i][BCOMP] = (GLubyte) (p * 255);
+                  rgba[i][ACOMP] = 255;
+               }
+	    }
+	    break;
+	 default:
+	    _mesa_problem(NULL,"Problem in DD.read_color_span (2)");
+            return;
+      }
+   }
+}
+
+
+
+/*
+ * Read an array of color index pixels.
+ */
+static void read_index_pixels( const GLcontext *ctx,
+			       GLuint n, const GLint x[], const GLint y[],
+                               GLuint indx[], const GLubyte mask[] )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   register GLuint i;
+   XMesaBuffer source = xmesa->xm_buffer;
+
+   if (source->buffer) {
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            indx[i] = (GLuint) read_pixel( xmesa->display,
+                                           source->buffer,
+                                           x[i], FLIP(source, y[i]) );
+         }
+      }
+   }
+   else if (source->backimage) {
+      XMesaImage *img = source->backimage;
+      for (i=0;i<n;i++) {
+         if (mask[i]) {
+            indx[i] = (GLuint) XMesaGetPixel( img, x[i], FLIP(source, y[i]) );
+         }
+      }
+   }
+}
+
+
+
+static void read_color_pixels( const GLcontext *ctx,
+			       GLuint n, const GLint x[], const GLint y[],
+                               GLubyte rgba[][4], const GLubyte mask[] )
+{
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaDisplay *dpy = xmesa->xm_visual->display;
+   register GLuint i;
+   XMesaBuffer source = xmesa->xm_buffer;
+   XMesaDrawable buffer = source->buffer;  /* the X drawable */
+
+   if (source->buffer) {
+      switch (xmesa->pixelformat) {
+	 case PF_Truecolor:
+         case PF_Dither_True:
+         case PF_5R6G5B:
+         case PF_Dither_5R6G5B:
+            {
+               unsigned long rMask = GET_REDMASK(xmesa->xm_visual);
+               unsigned long gMask = GET_GREENMASK(xmesa->xm_visual);
+               unsigned long bMask = GET_BLUEMASK(xmesa->xm_visual);
+               GLubyte *pixelToR = xmesa->xm_visual->PixelToR;
+               GLubyte *pixelToG = xmesa->xm_visual->PixelToG;
+               GLubyte *pixelToB = xmesa->xm_visual->PixelToB;
+               GLint rShift = xmesa->xm_visual->rshift;
+               GLint gShift = xmesa->xm_visual->gshift;
+               GLint bShift = xmesa->xm_visual->bshift;
+               for (i=0;i<n;i++) {
+                  if (mask[i]) {
+                     unsigned long p = read_pixel( dpy, buffer,
+                                                   x[i], FLIP(source, y[i]) );
+                     rgba[i][RCOMP] = pixelToR[(p & rMask) >> rShift];
+                     rgba[i][GCOMP] = pixelToG[(p & gMask) >> gShift];
+                     rgba[i][BCOMP] = pixelToB[(p & bMask) >> bShift];
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+            }
+            break;
+	 case PF_8A8B8G8R:
+	    for (i=0;i<n;i++) {
+               if (mask[i]) {
+                  unsigned long p = read_pixel( dpy, buffer,
+                                                x[i], FLIP(source, y[i]) );
+                  rgba[i][RCOMP] = (GLubyte) ( p        & 0xff);
+                  rgba[i][GCOMP] = (GLubyte) ((p >> 8)  & 0xff);
+                  rgba[i][BCOMP] = (GLubyte) ((p >> 16) & 0xff);
+                  rgba[i][ACOMP] = (GLubyte) ((p >> 24) & 0xff);
+               }
+	    }
+	    break;
+	 case PF_8A8R8G8B:
+	    for (i=0;i<n;i++) {
+               if (mask[i]) {
+                  unsigned long p = read_pixel( dpy, buffer,
+                                                x[i], FLIP(source, y[i]) );
+                  rgba[i][RCOMP] = (GLubyte) ((p >> 16) & 0xff);
+                  rgba[i][GCOMP] = (GLubyte) ((p >> 8)  & 0xff);
+                  rgba[i][BCOMP] = (GLubyte) ( p        & 0xff);
+                  rgba[i][ACOMP] = (GLubyte) ((p >> 24) & 0xff);
+               }
+	    }
+	    break;
+	 case PF_8R8G8B:
+	    for (i=0;i<n;i++) {
+               if (mask[i]) {
+                  unsigned long p = read_pixel( dpy, buffer,
+                                                x[i], FLIP(source, y[i]) );
+                  rgba[i][RCOMP] = (GLubyte) ((p >> 16) & 0xff);
+                  rgba[i][GCOMP] = (GLubyte) ((p >> 8)  & 0xff);
+                  rgba[i][BCOMP] = (GLubyte) ( p        & 0xff);
+                  rgba[i][ACOMP] = 255;
+               }
+	    }
+	    break;
+	 case PF_8R8G8B24:
+	    for (i=0;i<n;i++) {
+               if (mask[i]) {
+                  unsigned long p = read_pixel( dpy, buffer,
+                                                x[i], FLIP(source, y[i]) );
+                  rgba[i][RCOMP] = (GLubyte) ((p >> 16) & 0xff);
+                  rgba[i][GCOMP] = (GLubyte) ((p >> 8)  & 0xff);
+                  rgba[i][BCOMP] = (GLubyte) ( p        & 0xff);
+                  rgba[i][ACOMP] = 255;
+               }
+	    }
+	    break;
+         case PF_HPCR:
+            {
+               for (i=0;i<n;i++) {
+                  if (mask[i]) {
+                     unsigned long p = read_pixel( dpy, buffer,
+                                                   x[i], FLIP(source, y[i]) );
+                     rgba[i][RCOMP] = (GLubyte) ( p & 0xE0      );
+                     rgba[i][GCOMP] = (GLubyte) ((p & 0x1C) << 3);
+                     rgba[i][BCOMP] = (GLubyte) ((p & 0x03) << 6);
+                     rgba[i][ACOMP] = (GLubyte) 255;
+                  }
+               }
+            }
+            break;
+	 case PF_Dither:
+	 case PF_Lookup:
+	 case PF_Grayscale:
+            {
+               GLubyte *rTable = source->pixel_to_r;
+               GLubyte *gTable = source->pixel_to_g;
+               GLubyte *bTable = source->pixel_to_b;
+               for (i=0;i<n;i++) {
+                  if (mask[i]) {
+                     unsigned long p = read_pixel( dpy, buffer,
+                                                   x[i], FLIP(source, y[i]) );
+                     rgba[i][RCOMP] = rTable[p];
+                     rgba[i][GCOMP] = gTable[p];
+                     rgba[i][BCOMP] = bTable[p];
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+	    }
+	    break;
+	 case PF_1Bit:
+            {
+               int bitFlip = xmesa->xm_visual->bitFlip;
+               for (i=0;i<n;i++) {
+                  if (mask[i]) {
+                     unsigned long p = read_pixel( dpy, buffer,
+                                     x[i], FLIP(source, y[i])) ^ bitFlip;
+                     rgba[i][RCOMP] = (GLubyte) (p * 255);
+                     rgba[i][GCOMP] = (GLubyte) (p * 255);
+                     rgba[i][BCOMP] = (GLubyte) (p * 255);
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+	    }
+	    break;
+	 default:
+	    _mesa_problem(NULL,"Problem in DD.read_color_pixels (1)");
+            return;
+      }
+   }
+   else if (source->backimage) {
+      switch (xmesa->pixelformat) {
+	 case PF_Truecolor:
+         case PF_Dither_True:
+         case PF_5R6G5B:
+         case PF_Dither_5R6G5B:
+            {
+               unsigned long rMask = GET_REDMASK(xmesa->xm_visual);
+               unsigned long gMask = GET_GREENMASK(xmesa->xm_visual);
+               unsigned long bMask = GET_BLUEMASK(xmesa->xm_visual);
+               GLubyte *pixelToR = xmesa->xm_visual->PixelToR;
+               GLubyte *pixelToG = xmesa->xm_visual->PixelToG;
+               GLubyte *pixelToB = xmesa->xm_visual->PixelToB;
+               GLint rShift = xmesa->xm_visual->rshift;
+               GLint gShift = xmesa->xm_visual->gshift;
+               GLint bShift = xmesa->xm_visual->bshift;
+               XMesaImage *img = source->backimage;
+               for (i=0;i<n;i++) {
+                  if (mask[i]) {
+                     unsigned long p;
+                     p = XMesaGetPixel( img, x[i], FLIP(source, y[i]) );
+                     rgba[i][RCOMP] = pixelToR[(p & rMask) >> rShift];
+                     rgba[i][GCOMP] = pixelToG[(p & gMask) >> gShift];
+                     rgba[i][BCOMP] = pixelToB[(p & bMask) >> bShift];
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+            }
+            break;
+	 case PF_8A8B8G8R:
+	    for (i=0;i<n;i++) {
+	       if (mask[i]) {
+                  GLuint *ptr4 = PIXELADDR4( source, x[i], y[i] );
+                  GLuint p4 = *ptr4;
+                  rgba[i][RCOMP] = (GLubyte) ( p4        & 0xff);
+                  rgba[i][GCOMP] = (GLubyte) ((p4 >> 8)  & 0xff);
+                  rgba[i][BCOMP] = (GLubyte) ((p4 >> 16) & 0xff);
+                  rgba[i][ACOMP] = (GLubyte) ((p4 >> 24) & 0xff);
+               }
+	    }
+	    break;
+	 case PF_8A8R8G8B:
+	    for (i=0;i<n;i++) {
+	       if (mask[i]) {
+                  GLuint *ptr4 = PIXELADDR4( source, x[i], y[i] );
+                  GLuint p4 = *ptr4;
+                  rgba[i][RCOMP] = (GLubyte) ((p4 >> 16) & 0xff);
+                  rgba[i][GCOMP] = (GLubyte) ((p4 >> 8)  & 0xff);
+                  rgba[i][BCOMP] = (GLubyte) ( p4        & 0xff);
+                  rgba[i][ACOMP] = (GLubyte) ((p4 >> 24) & 0xff);
+               }
+	    }
+	    break;
+	 case PF_8R8G8B:
+	    for (i=0;i<n;i++) {
+	       if (mask[i]) {
+                  GLuint *ptr4 = PIXELADDR4( source, x[i], y[i] );
+                  GLuint p4 = *ptr4;
+                  rgba[i][RCOMP] = (GLubyte) ((p4 >> 16) & 0xff);
+                  rgba[i][GCOMP] = (GLubyte) ((p4 >> 8)  & 0xff);
+                  rgba[i][BCOMP] = (GLubyte) ( p4        & 0xff);
+                  rgba[i][ACOMP] = 255;
+               }
+	    }
+	    break;
+	 case PF_8R8G8B24:
+	    for (i=0;i<n;i++) {
+	       if (mask[i]) {
+                  bgr_t *ptr3 = PIXELADDR3( source, x[i], y[i] );
+                  rgba[i][RCOMP] = ptr3->r;
+                  rgba[i][GCOMP] = ptr3->g;
+                  rgba[i][BCOMP] = ptr3->b;
+                  rgba[i][ACOMP] = 255;
+               }
+	    }
+	    break;
+         case PF_HPCR:
+            for (i=0;i<n;i++) {
+               if (mask[i]) {
+                  GLubyte *ptr1 = PIXELADDR1( source, x[i], y[i] );
+                  GLubyte p = *ptr1;
+                  rgba[i][RCOMP] =  p & 0xE0;
+                  rgba[i][GCOMP] = (p & 0x1C) << 3;
+                  rgba[i][BCOMP] = (p & 0x03) << 6;
+                  rgba[i][ACOMP] = 255;
+               }
+            }
+            break;
+	 case PF_Dither:
+	 case PF_Lookup:
+	 case PF_Grayscale:
+            {
+               GLubyte *rTable = source->pixel_to_r;
+               GLubyte *gTable = source->pixel_to_g;
+               GLubyte *bTable = source->pixel_to_b;
+               XMesaImage *img = source->backimage;
+               for (i=0;i<n;i++) {
+                  if (mask[i]) {
+                     unsigned long p;
+                     p = XMesaGetPixel( img, x[i], FLIP(source, y[i]) );
+                     rgba[i][RCOMP] = rTable[p];
+                     rgba[i][GCOMP] = gTable[p];
+                     rgba[i][BCOMP] = bTable[p];
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+	    }
+	    break;
+	 case PF_1Bit:
+            {
+               XMesaImage *img = source->backimage;
+               int bitFlip = xmesa->xm_visual->bitFlip;
+               for (i=0;i<n;i++) {
+                  if (mask[i]) {
+                     unsigned long p;
+                     p = XMesaGetPixel( img, x[i], FLIP(source, y[i]) ) ^ bitFlip;
+                     rgba[i][RCOMP] = (GLubyte) (p * 255);
+                     rgba[i][GCOMP] = (GLubyte) (p * 255);
+                     rgba[i][BCOMP] = (GLubyte) (p * 255);
+                     rgba[i][ACOMP] = 255;
+                  }
+               }
+	    }
+	    break;
+	 default:
+	    _mesa_problem(NULL,"Problem in DD.read_color_pixels (1)");
+            return;
+      }
+   }
+}
+
+
+static void
+clear_color_HPCR_ximage( GLcontext *ctx, const GLfloat color[4] )
+{
+   int i;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[0], color[0]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[1], color[1]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[2], color[2]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[3], color[3]);
+
+   if (color[0] == 0.0 && color[1] == 0.0 && color[2] == 0.0) {
+      /* black is black */
+      MEMSET( xmesa->xm_visual->hpcr_clear_ximage_pattern, 0x0 ,
+              sizeof(xmesa->xm_visual->hpcr_clear_ximage_pattern));
+   }
+   else {
+      /* build clear pattern */
+      for (i=0; i<16; i++) {
+         xmesa->xm_visual->hpcr_clear_ximage_pattern[0][i] =
+            DITHER_HPCR(i, 0,
+                        xmesa->clearcolor[0],
+                        xmesa->clearcolor[1],
+                        xmesa->clearcolor[2]);
+         xmesa->xm_visual->hpcr_clear_ximage_pattern[1][i]    =
+            DITHER_HPCR(i, 1,
+                        xmesa->clearcolor[0],
+                        xmesa->clearcolor[1],
+                        xmesa->clearcolor[2]);
+      }
+   }
+}
+
+
+static void
+clear_color_HPCR_pixmap( GLcontext *ctx, const GLfloat color[4] )
+{
+   int i;
+   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
+
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[0], color[0]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[1], color[1]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[2], color[2]);
+   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[3], color[3]);
+
+   if (color[0] == 0.0 && color[1] == 0.0 && color[2] == 0.0) {
+      /* black is black */
+      for (i=0; i<16; i++) {
+         XMesaPutPixel(xmesa->xm_visual->hpcr_clear_ximage, i, 0, 0);
+         XMesaPutPixel(xmesa->xm_visual->hpcr_clear_ximage, i, 1, 0);
+      }
+   }
+   else {
+      for (i=0; i<16; i++) {
+         XMesaPutPixel(xmesa->xm_visual->hpcr_clear_ximage, i, 0,
+                       DITHER_HPCR(i, 0,
+                                   xmesa->clearcolor[0],
+                                   xmesa->clearcolor[1],
+                                   xmesa->clearcolor[2]));
+         XMesaPutPixel(xmesa->xm_visual->hpcr_clear_ximage, i, 1,
+                       DITHER_HPCR(i, 1,
+                                   xmesa->clearcolor[0],
+                                   xmesa->clearcolor[1],
+                                   xmesa->clearcolor[2]));
+      }
+   }
+   /* change tile pixmap content */
+   XMesaPutImage(xmesa->display,
+		 (XMesaDrawable)xmesa->xm_visual->hpcr_clear_pixmap,
+		 xmesa->xm_buffer->cleargc,
+		 xmesa->xm_visual->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
+}
+
+
+
+void xmesa_update_span_funcs( GLcontext *ctx )
+{
+   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   int depth=GET_VISUAL_DEPTH(xmesa->xm_visual);
+   struct swrast_device_driver *dd = _swrast_GetDeviceDriverReference( ctx );
+
+   /*
+    * These drawing functions depend on color buffer config:
+    */
+   if (xmesa->xm_buffer->buffer!=XIMAGE) {
+      /* Writing to window or back pixmap */
+      switch (xmesa->pixelformat) {
+	 case PF_Index:
+	    dd->WriteCI32Span     = write_span_index_pixmap;
+	    dd->WriteCI8Span      = write_span_index8_pixmap;
+	    dd->WriteMonoCISpan   = write_span_mono_index_pixmap;
+	    dd->WriteCI32Pixels   = write_pixels_index_pixmap;
+	    dd->WriteMonoCIPixels = write_pixels_mono_index_pixmap;
+	    break;
+	 case PF_Truecolor:
+	    dd->WriteRGBASpan       = write_span_TRUECOLOR_pixmap;
+	    dd->WriteRGBSpan        = write_span_rgb_TRUECOLOR_pixmap;
+	    dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
+	    dd->WriteRGBAPixels     = write_pixels_TRUECOLOR_pixmap;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
+	    break;
+	 case PF_Dither_True:
+	    dd->WriteRGBASpan       = write_span_TRUEDITHER_pixmap;
+	    dd->WriteRGBSpan        = write_span_rgb_TRUEDITHER_pixmap;
+	    dd->WriteMonoRGBASpan   = write_span_mono_TRUEDITHER_pixmap;
+	    dd->WriteRGBAPixels     = write_pixels_TRUEDITHER_pixmap;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_TRUEDITHER_pixmap;
+	    break;
+	 case PF_8A8B8G8R:
+	    dd->WriteRGBASpan       = write_span_8A8B8G8R_pixmap;
+	    dd->WriteRGBSpan        = write_span_rgb_8A8B8G8R_pixmap;
+	    dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
+	    dd->WriteRGBAPixels     = write_pixels_8A8B8G8R_pixmap;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
+	    break;
+	 case PF_8A8R8G8B:
+	    dd->WriteRGBASpan       = write_span_8A8R8G8B_pixmap;
+	    dd->WriteRGBSpan        = write_span_rgb_8A8R8G8B_pixmap;
+	    dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
+	    dd->WriteRGBAPixels     = write_pixels_8A8R8G8B_pixmap;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
+	    break;
+	 case PF_8R8G8B:
+	    dd->WriteRGBASpan       = write_span_8R8G8B_pixmap;
+	    dd->WriteRGBSpan        = write_span_rgb_8R8G8B_pixmap;
+	    dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
+	    dd->WriteRGBAPixels     = write_pixels_8R8G8B_pixmap;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
+	    break;
+	 case PF_8R8G8B24:
+	    dd->WriteRGBASpan       = write_span_8R8G8B24_pixmap;
+	    dd->WriteRGBSpan        = write_span_rgb_8R8G8B24_pixmap;
+	    dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
+	    dd->WriteRGBAPixels     = write_pixels_8R8G8B24_pixmap;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
+	    break;
+	 case PF_5R6G5B:
+	    dd->WriteRGBASpan       = write_span_5R6G5B_pixmap;
+	    dd->WriteRGBSpan        = write_span_rgb_5R6G5B_pixmap;
+	    dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
+	    dd->WriteRGBAPixels     = write_pixels_5R6G5B_pixmap;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
+	    break;
+	 case PF_Dither_5R6G5B:
+	    dd->WriteRGBASpan       = write_span_DITHER_5R6G5B_pixmap;
+	    dd->WriteRGBSpan        = write_span_rgb_DITHER_5R6G5B_pixmap;
+	    dd->WriteMonoRGBASpan   = write_span_mono_TRUEDITHER_pixmap;
+	    dd->WriteRGBAPixels     = write_pixels_DITHER_5R6G5B_pixmap;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_TRUEDITHER_pixmap;
+	    break;
+	 case PF_Dither:
+	    dd->WriteRGBASpan       = write_span_DITHER_pixmap;
+	    dd->WriteRGBSpan        = write_span_rgb_DITHER_pixmap;
+	    dd->WriteMonoRGBASpan   = write_span_mono_DITHER_pixmap;
+	    dd->WriteRGBAPixels     = write_pixels_DITHER_pixmap;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_DITHER_pixmap;
+	    break;
+	 case PF_1Bit:
+	    dd->WriteRGBASpan       = write_span_1BIT_pixmap;
+	    dd->WriteRGBSpan        = write_span_rgb_1BIT_pixmap;
+	    dd->WriteMonoRGBASpan   = write_span_mono_1BIT_pixmap;
+	    dd->WriteRGBAPixels     = write_pixels_1BIT_pixmap;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_1BIT_pixmap;
+	    break;
+         case PF_HPCR:
+            dd->WriteRGBASpan       = write_span_HPCR_pixmap;
+            dd->WriteRGBSpan        = write_span_rgb_HPCR_pixmap;
+            dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
+            dd->WriteRGBAPixels     = write_pixels_HPCR_pixmap;
+            dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
+	    if (xmesa->xm_visual->hpcr_clear_flag) {
+	       ctx->Driver.ClearColor = clear_color_HPCR_pixmap;
+	    }
+            break;
+         case PF_Lookup:
+            dd->WriteRGBASpan       = write_span_LOOKUP_pixmap;
+            dd->WriteRGBSpan        = write_span_rgb_LOOKUP_pixmap;
+            dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
+            dd->WriteRGBAPixels     = write_pixels_LOOKUP_pixmap;
+            dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
+            break;
+         case PF_Grayscale:
+            dd->WriteRGBASpan       = write_span_GRAYSCALE_pixmap;
+            dd->WriteRGBSpan        = write_span_rgb_GRAYSCALE_pixmap;
+            dd->WriteMonoRGBASpan   = write_span_mono_pixmap;
+            dd->WriteRGBAPixels     = write_pixels_GRAYSCALE_pixmap;
+            dd->WriteMonoRGBAPixels = write_pixels_mono_pixmap;
+            break;
+	 default:
+	    _mesa_problem(NULL,"Bad pixel format in xmesa_update_state (1)");
+            return;
+      }
+   }
+   else if (xmesa->xm_buffer->buffer==XIMAGE) {
+      /* Writing to back XImage */
+      switch (xmesa->pixelformat) {
+	 case PF_Index:
+	    dd->WriteCI32Span     = write_span_index_ximage;
+	    if (depth==8)
+               dd->WriteCI8Span   = write_span_index8_ximage8;
+            else
+               dd->WriteCI8Span   = write_span_index8_ximage;
+	    dd->WriteMonoCISpan   = write_span_mono_index_ximage;
+	    dd->WriteCI32Pixels   = write_pixels_index_ximage;
+	    dd->WriteMonoCIPixels = write_pixels_mono_index_ximage;
+	    break;
+	 case PF_Truecolor:
+	    /* Generic RGB */
+	    dd->WriteRGBASpan       = write_span_TRUECOLOR_ximage;
+	    dd->WriteRGBSpan        = write_span_rgb_TRUECOLOR_ximage;
+	    dd->WriteMonoRGBASpan   = write_span_mono_ximage;
+	    dd->WriteRGBAPixels     = write_pixels_TRUECOLOR_ximage;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_ximage;
+	    break;
+	 case PF_Dither_True:
+	    dd->WriteRGBASpan       = write_span_TRUEDITHER_ximage;
+	    dd->WriteRGBSpan        = write_span_rgb_TRUEDITHER_ximage;
+	    dd->WriteMonoRGBASpan   = write_span_mono_TRUEDITHER_ximage;
+	    dd->WriteRGBAPixels     = write_pixels_TRUEDITHER_ximage;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_TRUEDITHER_ximage;
+	    break;
+	 case PF_8A8B8G8R:
+	    dd->WriteRGBASpan       = write_span_8A8B8G8R_ximage;
+	    dd->WriteRGBSpan        = write_span_rgb_8A8B8G8R_ximage;
+	    dd->WriteMonoRGBASpan   = write_span_mono_8A8B8G8R_ximage;
+	    dd->WriteRGBAPixels     = write_pixels_8A8B8G8R_ximage;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_8A8B8G8R_ximage;
+	    break;
+	 case PF_8A8R8G8B:
+	    dd->WriteRGBASpan       = write_span_8A8R8G8B_ximage;
+	    dd->WriteRGBSpan        = write_span_rgb_8A8R8G8B_ximage;
+	    dd->WriteMonoRGBASpan   = write_span_mono_8A8R8G8B_ximage;
+	    dd->WriteRGBAPixels     = write_pixels_8A8R8G8B_ximage;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_8A8R8G8B_ximage;
+	    break;
+	case PF_8R8G8B:
+	    dd->WriteRGBASpan       = write_span_8R8G8B_ximage;
+	    dd->WriteRGBSpan        = write_span_rgb_8R8G8B_ximage;
+	    dd->WriteMonoRGBASpan   = write_span_mono_8R8G8B_ximage;
+	    dd->WriteRGBAPixels     = write_pixels_8R8G8B_ximage;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_8R8G8B_ximage;
+	    break;
+	 case PF_8R8G8B24:
+	    dd->WriteRGBASpan       = write_span_8R8G8B24_ximage;
+	    dd->WriteRGBSpan        = write_span_rgb_8R8G8B24_ximage;
+	    dd->WriteMonoRGBASpan   = write_span_mono_8R8G8B24_ximage;
+	    dd->WriteRGBAPixels     = write_pixels_8R8G8B24_ximage;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_8R8G8B24_ximage;
+	    break;
+	 case PF_5R6G5B:
+	    dd->WriteRGBASpan       = write_span_5R6G5B_ximage;
+	    dd->WriteRGBSpan        = write_span_rgb_5R6G5B_ximage;
+	    dd->WriteMonoRGBASpan   = write_span_mono_ximage;
+	    dd->WriteRGBAPixels     = write_pixels_5R6G5B_ximage;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_ximage;
+	    break;
+	 case PF_Dither_5R6G5B:
+	    dd->WriteRGBASpan       = write_span_DITHER_5R6G5B_ximage;
+	    dd->WriteRGBSpan        = write_span_rgb_DITHER_5R6G5B_ximage;
+	    dd->WriteMonoRGBASpan   = write_span_mono_DITHER_5R6G5B_ximage;
+	    dd->WriteRGBAPixels     = write_pixels_DITHER_5R6G5B_ximage;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_DITHER_5R6G5B_ximage;
+	    break;
+	 case PF_Dither:
+	    if (depth==8) {
+	       dd->WriteRGBASpan      = write_span_DITHER8_ximage;
+	       dd->WriteRGBSpan       = write_span_rgb_DITHER8_ximage;
+	       dd->WriteMonoRGBASpan  = write_span_mono_DITHER8_ximage;
+	       dd->WriteRGBAPixels    = write_pixels_DITHER8_ximage;
+	       dd->WriteMonoRGBAPixels = write_pixels_mono_DITHER8_ximage;
+	    }
+	    else {
+	       dd->WriteRGBASpan       = write_span_DITHER_ximage;
+	       dd->WriteRGBSpan        = write_span_rgb_DITHER_ximage;
+	       dd->WriteMonoRGBASpan   = write_span_mono_DITHER_ximage;
+	       dd->WriteRGBAPixels     = write_pixels_DITHER_ximage;
+	       dd->WriteMonoRGBAPixels = write_pixels_mono_DITHER_ximage;
+	    }
+	    break;
+	 case PF_1Bit:
+	    dd->WriteRGBASpan       = write_span_1BIT_ximage;
+	    dd->WriteRGBSpan        = write_span_rgb_1BIT_ximage;
+	    dd->WriteMonoRGBASpan   = write_span_mono_1BIT_ximage;
+	    dd->WriteRGBAPixels     = write_pixels_1BIT_ximage;
+	    dd->WriteMonoRGBAPixels = write_pixels_mono_1BIT_ximage;
+	    break;
+         case PF_HPCR:
+            dd->WriteRGBASpan       = write_span_HPCR_ximage;
+            dd->WriteRGBSpan        = write_span_rgb_HPCR_ximage;
+            dd->WriteMonoRGBASpan   = write_span_mono_HPCR_ximage;
+            dd->WriteRGBAPixels     = write_pixels_HPCR_ximage;
+            dd->WriteMonoRGBAPixels = write_pixels_mono_HPCR_ximage;
+	    if (xmesa->xm_visual->hpcr_clear_flag) {
+               ctx->Driver.ClearColor = clear_color_HPCR_ximage;
+	    }
+            break;
+         case PF_Lookup:
+	    if (depth==8) {
+               dd->WriteRGBASpan       = write_span_LOOKUP8_ximage;
+               dd->WriteRGBSpan        = write_rgb_LOOKUP8_ximage;
+               dd->WriteMonoRGBASpan   = write_span_mono_LOOKUP8_ximage;
+               dd->WriteRGBAPixels     = write_pixels_LOOKUP8_ximage;
+               dd->WriteMonoRGBAPixels = write_pixels_mono_LOOKUP8_ximage;
+            }
+            else {
+               dd->WriteRGBASpan       = write_span_LOOKUP_ximage;
+               dd->WriteRGBSpan        = write_span_rgb_LOOKUP_ximage;
+               dd->WriteMonoRGBASpan   = write_span_mono_ximage;
+               dd->WriteRGBAPixels     = write_pixels_LOOKUP_ximage;
+               dd->WriteMonoRGBAPixels = write_pixels_mono_ximage;
+            }
+            break;
+         case PF_Grayscale:
+	    if (depth==8) {
+	       dd->WriteRGBASpan       = write_span_GRAYSCALE8_ximage;
+	       dd->WriteRGBSpan        = write_span_rgb_GRAYSCALE8_ximage;
+	       dd->WriteMonoRGBASpan   = write_span_mono_GRAYSCALE8_ximage;
+	       dd->WriteRGBAPixels     = write_pixels_GRAYSCALE8_ximage;
+	       dd->WriteMonoRGBAPixels = write_pixels_mono_GRAYSCALE8_ximage;
+	    }
+	    else {
+	       dd->WriteRGBASpan       = write_span_GRAYSCALE_ximage;
+	       dd->WriteRGBSpan        = write_span_rgb_GRAYSCALE_ximage;
+	       dd->WriteMonoRGBASpan   = write_span_mono_ximage;
+	       dd->WriteRGBAPixels     = write_pixels_GRAYSCALE_ximage;
+	       dd->WriteMonoRGBAPixels = write_pixels_mono_ximage;
+	    }
+	    break;
+	 default:
+	    _mesa_problem(NULL,"Bad pixel format in xmesa_update_state (2)");
+            return;
+      }
+   }
+
+   /* Pixel/span reading functions: */
+   dd->ReadCI32Span = read_index_span;
+   dd->ReadRGBASpan = read_color_span;
+   dd->ReadCI32Pixels = read_index_pixels;
+   dd->ReadRGBAPixels = read_color_pixels;
+}