Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 801 insertions, 0 deletions

diff --git a/nx-X11/extras/Mesa/src/mesa/swrast/s_copypix.c b/nx-X11/extras/Mesa/src/mesa/swrast/s_copypix.c
new file mode 100644
index 000000000..05f81c690
--- /dev/null
+++ b/nx-X11/extras/Mesa/src/mesa/swrast/s_copypix.c
@@ -0,0 +1,801 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.4
+ *
+ * Copyright (C) 1999-2005  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.
+ */
+
+
+#include "glheader.h"
+#include "context.h"
+#include "colormac.h"
+#include "convolve.h"
+#include "histogram.h"
+#include "image.h"
+#include "macros.h"
+#include "imports.h"
+#include "pixel.h"
+
+#include "s_context.h"
+#include "s_depth.h"
+#include "s_pixeltex.h"
+#include "s_span.h"
+#include "s_stencil.h"
+#include "s_texture.h"
+#include "s_zoom.h"
+
+
+
+/*
+ * Determine if there's overlap in an image copy.
+ * This test also compensates for the fact that copies are done from
+ * bottom to top and overlaps can sometimes be handled correctly
+ * without making a temporary image copy.
+ */
+static GLboolean
+regions_overlap(GLint srcx, GLint srcy,
+                GLint dstx, GLint dsty,
+                GLint width, GLint height,
+                GLfloat zoomX, GLfloat zoomY)
+{
+   if (zoomX == 1.0 && zoomY == 1.0) {
+      /* no zoom */
+      if (srcx >= dstx + width || (srcx + width <= dstx)) {
+         return GL_FALSE;
+      }
+      else if (srcy < dsty) { /* this is OK */
+         return GL_FALSE;
+      }
+      else if (srcy > dsty + height) {
+         return GL_FALSE;
+      }
+      else {
+         return GL_TRUE;
+      }
+   }
+   else {
+      /* add one pixel of slop when zooming, just to be safe */
+      if ((srcx > dstx + (width * zoomX) + 1) || (srcx + width + 1 < dstx)) {
+         return GL_FALSE;
+      }
+      else if ((srcy < dsty) && (srcy + height < dsty + (height * zoomY))) {
+         return GL_FALSE;
+      }
+      else if ((srcy > dsty) && (srcy + height > dsty + (height * zoomY))) {
+         return GL_FALSE;
+      }
+      else {
+         return GL_TRUE;
+      }
+   }
+}
+
+
+/**
+ * Convert GLfloat[n][4] colors to GLchan[n][4].
+ * XXX maybe move into image.c
+ */
+static void
+float_span_to_chan(GLuint n, CONST GLfloat in[][4], GLchan out[][4])
+{
+   GLuint i;
+   for (i = 0; i < n; i++) {
+      UNCLAMPED_FLOAT_TO_CHAN(out[i][RCOMP], in[i][RCOMP]);
+      UNCLAMPED_FLOAT_TO_CHAN(out[i][GCOMP], in[i][GCOMP]);
+      UNCLAMPED_FLOAT_TO_CHAN(out[i][BCOMP], in[i][BCOMP]);
+      UNCLAMPED_FLOAT_TO_CHAN(out[i][ACOMP], in[i][ACOMP]);
+   }
+}
+
+
+/**
+ * Convert GLchan[n][4] colors to GLfloat[n][4].
+ * XXX maybe move into image.c
+ */
+static void
+chan_span_to_float(GLuint n, CONST GLchan in[][4], GLfloat out[][4])
+{
+   GLuint i;
+   for (i = 0; i < n; i++) {
+      out[i][RCOMP] = CHAN_TO_FLOAT(in[i][RCOMP]);
+      out[i][GCOMP] = CHAN_TO_FLOAT(in[i][GCOMP]);
+      out[i][BCOMP] = CHAN_TO_FLOAT(in[i][BCOMP]);
+      out[i][ACOMP] = CHAN_TO_FLOAT(in[i][ACOMP]);
+   }
+}
+
+
+
+/*
+ * RGBA copypixels with convolution.
+ */
+static void
+copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
+                      GLint width, GLint height, GLint destx, GLint desty)
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   struct gl_renderbuffer *drawRb = NULL;
+   GLboolean quick_draw;
+   GLint row;
+   GLboolean changeBuffer;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   const GLuint transferOps = ctx->_ImageTransferState;
+   GLfloat *dest, *tmpImage, *convImage;
+   struct sw_span span;
+
+   INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
+
+   if (ctx->Depth.Test)
+      _swrast_span_default_z(ctx, &span);
+   if (swrast->_FogEnabled)
+      _swrast_span_default_fog(ctx, &span);
+
+
+   if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
+       && !zoom
+       && destx >= 0
+       && destx + width <= (GLint) ctx->DrawBuffer->Width) {
+      quick_draw = GL_TRUE;
+      drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0][0];
+   }
+   else {
+      quick_draw = GL_FALSE;
+   }
+
+   /* If read and draw buffer are different we must do buffer switching */
+   changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer[0]
+               || ctx->DrawBuffer != ctx->ReadBuffer;
+
+
+   /* allocate space for GLfloat image */
+   tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
+   if (!tmpImage) {
+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+      return;
+   }
+   convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
+   if (!convImage) {
+      FREE(tmpImage);
+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+      return;
+   }
+
+   if (changeBuffer) {
+      /* choose the read buffer */
+      _swrast_use_read_buffer(ctx);
+   }
+
+   /* read source image */
+   dest = tmpImage;
+   for (row = 0; row < height; row++) {
+      GLchan rgba[MAX_WIDTH][4];
+      /* Read GLchan and convert to GLfloat */
+      _swrast_read_rgba_span(ctx, ctx->ReadBuffer->_ColorReadBuffer,
+                             width, srcx, srcy + row, rgba);
+      chan_span_to_float(width, (CONST GLchan (*)[4]) rgba,
+                         (GLfloat (*)[4]) dest);
+      dest += 4 * width;
+   }
+
+   if (changeBuffer) {
+      /* restore default src/dst buffer */
+      _swrast_use_draw_buffer(ctx);
+   }
+
+   /* do the image transfer ops which preceed convolution */
+   for (row = 0; row < height; row++) {
+      GLfloat (*rgba)[4] = (GLfloat (*)[4]) (tmpImage + row * width * 4);
+      _mesa_apply_rgba_transfer_ops(ctx,
+                                    transferOps & IMAGE_PRE_CONVOLUTION_BITS,
+                                    width, rgba);
+   }
+
+   /* do convolution */
+   if (ctx->Pixel.Convolution2DEnabled) {
+      _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
+   }
+   else {
+      ASSERT(ctx->Pixel.Separable2DEnabled);
+      _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
+   }
+   FREE(tmpImage);
+
+   /* do remaining post-convolution image transfer ops */
+   for (row = 0; row < height; row++) {
+      GLfloat (*rgba)[4] = (GLfloat (*)[4]) (convImage + row * width * 4);
+      _mesa_apply_rgba_transfer_ops(ctx,
+                                    transferOps & IMAGE_POST_CONVOLUTION_BITS,
+                                    width, rgba);
+   }
+
+   /* write the new image */
+   for (row = 0; row < height; row++) {
+      const GLfloat *src = convImage + row * width * 4;
+      GLint dy;
+
+      /* convert floats back to chan */
+      float_span_to_chan(width, (const GLfloat (*)[4]) src, span.array->rgba);
+
+      if (ctx->Pixel.PixelTextureEnabled && ctx->Texture._EnabledUnits) {
+         span.end = width;
+         _swrast_pixel_texture(ctx, &span);
+      }
+
+      /* write row to framebuffer */
+
+      dy = desty + row;
+      if (quick_draw && dy >= 0 && dy < (GLint) ctx->DrawBuffer->Height) {
+         drawRb->PutRow(ctx, drawRb, width, destx, dy, span.array->rgba, NULL);
+      }
+      else if (zoom) {
+         span.x = destx;
+         span.y = dy;
+         span.end = width;
+         _swrast_write_zoomed_rgba_span(ctx, &span, 
+                                     (CONST GLchan (*)[4])span.array->rgba,
+                                     desty, 0);
+      }
+      else {
+         span.x = destx;
+         span.y = dy;
+         span.end = width;
+         _swrast_write_rgba_span(ctx, &span);
+      }
+   }
+
+   FREE(convImage);
+}
+
+
+/*
+ * RGBA copypixels
+ */
+static void
+copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
+                 GLint width, GLint height, GLint destx, GLint desty)
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   struct gl_renderbuffer *drawRb;
+   GLchan *tmpImage,*p;
+   GLboolean quick_draw;
+   GLint sy, dy, stepy, j;
+   GLboolean changeBuffer;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   GLint overlapping;
+   const GLuint transferOps = ctx->_ImageTransferState;
+   struct sw_span span;
+
+   if (!ctx->ReadBuffer->_ColorReadBuffer) {
+      /* no readbuffer - OK */
+      return;
+   }
+
+   INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
+
+   if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
+      copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
+      return;
+   }
+
+   /* Determine if copy should be done bottom-to-top or top-to-bottom */
+   if (srcy < desty) {
+      /* top-down  max-to-min */
+      sy = srcy + height - 1;
+      dy = desty + height - 1;
+      stepy = -1;
+   }
+   else {
+      /* bottom-up  min-to-max */
+      sy = srcy;
+      dy = desty;
+      stepy = 1;
+   }
+
+   if (ctx->DrawBuffer == ctx->ReadBuffer) {
+      overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                    ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+   }
+   else {
+      overlapping = GL_FALSE;
+   }
+
+   if (ctx->Depth.Test)
+      _swrast_span_default_z(ctx, &span);
+   if (swrast->_FogEnabled)
+      _swrast_span_default_fog(ctx, &span);
+
+   if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
+       && !zoom
+       && destx >= 0
+       && destx + width <= (GLint) ctx->DrawBuffer->Width) {
+      quick_draw = GL_TRUE;
+      drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0][0];
+   }
+   else {
+      quick_draw = GL_FALSE;
+      drawRb = NULL;
+   }
+
+   /* If read and draw buffer are different we must do buffer switching */
+   changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer[0]
+                  || ctx->DrawBuffer != ctx->ReadBuffer;
+
+   if (overlapping) {
+      GLint ssy = sy;
+      tmpImage = (GLchan *) MALLOC(width * height * sizeof(GLchan) * 4);
+      if (!tmpImage) {
+         _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      /* setup source */
+      if (changeBuffer)
+         _swrast_use_read_buffer(ctx);
+      /* read the source image */
+      p = tmpImage;
+      for (j = 0; j < height; j++, ssy += stepy) {
+         _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+                                 width, srcx, ssy, (GLchan (*)[4]) p );
+         p += width * 4;
+      }
+      p = tmpImage;
+      /* restore dest */
+      if (changeBuffer) {
+         _swrast_use_draw_buffer(ctx);
+         changeBuffer = GL_FALSE;
+      }
+   }
+   else {
+      tmpImage = NULL;  /* silence compiler warnings */
+      p = NULL;
+   }
+
+   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+      /* Get source pixels */
+      if (overlapping) {
+         /* get from buffered image */
+         ASSERT(width < MAX_WIDTH);
+         MEMCPY(span.array->rgba, p, width * sizeof(GLchan) * 4);
+         p += width * 4;
+      }
+      else {
+         /* get from framebuffer */
+         if (changeBuffer)
+            _swrast_use_read_buffer(ctx);
+         ASSERT(width < MAX_WIDTH);
+         _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+                                 width, srcx, sy, span.array->rgba );
+         if (changeBuffer)
+            _swrast_use_draw_buffer(ctx);
+      }
+
+      if (transferOps) {
+         DEFMARRAY(GLfloat, rgbaFloat, MAX_WIDTH, 4);  /* mac 32k limitation */
+         CHECKARRAY(rgbaFloat, return);
+
+         /* convert to float, transfer, convert back to chan */
+         chan_span_to_float(width, (CONST GLchan (*)[4]) span.array->rgba,
+                            rgbaFloat);
+         _mesa_apply_rgba_transfer_ops(ctx, transferOps, width, rgbaFloat);
+         float_span_to_chan(width, (CONST GLfloat (*)[4]) rgbaFloat,
+                            span.array->rgba);
+
+         UNDEFARRAY(rgbaFloat);  /* mac 32k limitation */
+      }
+
+      if (ctx->Pixel.PixelTextureEnabled && ctx->Texture._EnabledUnits) {
+         span.end = width;
+         _swrast_pixel_texture(ctx, &span);
+      }
+
+      /* Write color span */
+      if (quick_draw && dy >= 0 && dy < (GLint) ctx->DrawBuffer->Height) {
+         drawRb->PutRow(ctx, drawRb, width, destx, dy, span.array->rgba, NULL);
+      }
+      else if (zoom) {
+         span.x = destx;
+         span.y = dy;
+         span.end = width;
+         _swrast_write_zoomed_rgba_span(ctx, &span,
+                                     (CONST GLchan (*)[4]) span.array->rgba,
+                                     desty, 0);
+      }
+      else {
+         span.x = destx;
+         span.y = dy;
+         span.end = width;
+         _swrast_write_rgba_span(ctx, &span);
+      }
+   }
+
+   if (overlapping)
+      FREE(tmpImage);
+}
+
+
+static void
+copy_ci_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+                GLint width, GLint height,
+                GLint destx, GLint desty )
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   GLuint *tmpImage,*p;
+   GLint sy, dy, stepy;
+   GLint j;
+   GLboolean changeBuffer;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
+   GLint overlapping;
+   struct sw_span span;
+
+   if (!ctx->ReadBuffer->_ColorReadBuffer) {
+      /* no readbuffer - OK */
+      return;
+   }
+
+   INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_INDEX);
+
+   /* Determine if copy should be bottom-to-top or top-to-bottom */
+   if (srcy<desty) {
+      /* top-down  max-to-min */
+      sy = srcy + height - 1;
+      dy = desty + height - 1;
+      stepy = -1;
+   }
+   else {
+      /* bottom-up  min-to-max */
+      sy = srcy;
+      dy = desty;
+      stepy = 1;
+   }
+
+   if (ctx->DrawBuffer == ctx->ReadBuffer) {
+      overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                    ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+   }
+   else {
+      overlapping = GL_FALSE;
+   }
+
+   if (ctx->Depth.Test)
+      _swrast_span_default_z(ctx, &span);
+   if (swrast->_FogEnabled)
+      _swrast_span_default_fog(ctx, &span);
+
+   /* If read and draw buffer are different we must do buffer switching */
+   changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer[0]
+               || ctx->DrawBuffer != ctx->ReadBuffer;
+
+   if (overlapping) {
+      GLint ssy = sy;
+      tmpImage = (GLuint *) MALLOC(width * height * sizeof(GLuint));
+      if (!tmpImage) {
+         _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      /* setup source */
+      if (changeBuffer)
+         _swrast_use_read_buffer(ctx);
+      /* read the image */
+      p = tmpImage;
+      for (j = 0; j < height; j++, ssy += stepy) {
+         _swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+                                  width, srcx, ssy, p );
+         p += width;
+      }
+      p = tmpImage;
+      /* restore to draw buffer */
+      if (changeBuffer) {
+         _swrast_use_draw_buffer(ctx);
+         changeBuffer = GL_FALSE;
+      }
+   }
+   else {
+      tmpImage = NULL;  /* silence compiler warning */
+      p = NULL;
+   }
+
+   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+      /* Get color indexes */
+      if (overlapping) {
+         MEMCPY(span.array->index, p, width * sizeof(GLuint));
+         p += width;
+      }
+      else {
+         if (changeBuffer)
+            _swrast_use_read_buffer(ctx);
+         _swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+                                  width, srcx, sy, span.array->index );
+         if (changeBuffer)
+            _swrast_use_draw_buffer(ctx);
+      }
+
+      /* Apply shift, offset, look-up table */
+      if (shift_or_offset) {
+         _mesa_shift_and_offset_ci( ctx, width, span.array->index );
+      }
+      if (ctx->Pixel.MapColorFlag) {
+         _mesa_map_ci( ctx, width, span.array->index );
+      }
+
+      /* write color indexes */
+      span.x = destx;
+      span.y = dy;
+      span.end = width;
+      if (zoom)
+         _swrast_write_zoomed_index_span(ctx, &span, desty, 0);
+      else
+         _swrast_write_index_span(ctx, &span);
+   }
+
+   if (overlapping)
+      FREE(tmpImage);
+}
+
+
+
+/*
+ * TODO: Optimize!!!!
+ */
+static void
+copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+                   GLint width, GLint height,
+                   GLint destx, GLint desty )
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
+   struct gl_renderbuffer *readRb
+      = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
+   GLfloat *p, *tmpImage;
+   GLint sy, dy, stepy;
+   GLint i, j;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   GLint overlapping;
+   struct sw_span span;
+
+   if (!readRb) {
+      /* no readbuffer - OK */
+      return;
+   }
+
+   INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_Z);
+
+   if (!ctx->Visual.depthBits) {
+      _mesa_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
+      return;
+   }
+
+   /* Determine if copy should be bottom-to-top or top-to-bottom */
+   if (srcy<desty) {
+      /* top-down  max-to-min */
+      sy = srcy + height - 1;
+      dy = desty + height - 1;
+      stepy = -1;
+   }
+   else {
+      /* bottom-up  min-to-max */
+      sy = srcy;
+      dy = desty;
+      stepy = 1;
+   }
+
+   if (ctx->DrawBuffer == ctx->ReadBuffer) {
+      overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                    ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+   }
+   else {
+      overlapping = GL_FALSE;
+   }
+
+   _swrast_span_default_color(ctx, &span);
+   if (swrast->_FogEnabled)
+      _swrast_span_default_fog(ctx, &span);
+
+   if (overlapping) {
+      GLint ssy = sy;
+      tmpImage = (GLfloat *) MALLOC(width * height * sizeof(GLfloat));
+      if (!tmpImage) {
+         _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      p = tmpImage;
+      for (j = 0; j < height; j++, ssy += stepy) {
+         _swrast_read_depth_span_float(ctx, readRb, width, srcx, ssy, p);
+         p += width;
+      }
+      p = tmpImage;
+   }
+   else {
+      tmpImage = NULL;  /* silence compiler warning */
+      p = NULL;
+   }
+
+   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+      GLfloat depth[MAX_WIDTH];
+      /* get depth values */
+      if (overlapping) {
+         MEMCPY(depth, p, width * sizeof(GLfloat));
+         p += width;
+      }
+      else {
+         _swrast_read_depth_span_float(ctx, readRb, width, srcx, sy, depth);
+      }
+
+      /* apply scale and bias */
+      for (i = 0; i < width; i++) {
+         GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
+         span.array->z[i] = (GLdepth) (CLAMP(d, 0.0F, 1.0F) * depthMax);
+      }
+
+      /* write depth values */
+      span.x = destx;
+      span.y = dy;
+      span.end = width;
+      if (ctx->Visual.rgbMode) {
+         if (zoom)
+            _swrast_write_zoomed_rgba_span( ctx, &span, 
+                            (const GLchan (*)[4])span.array->rgba, desty, 0 );
+         else
+            _swrast_write_rgba_span(ctx, &span);
+      }
+      else {
+         if (zoom)
+            _swrast_write_zoomed_index_span( ctx, &span, desty, 0 );
+         else
+            _swrast_write_index_span(ctx, &span);
+      }
+   }
+
+   if (overlapping)
+      FREE(tmpImage);
+}
+
+
+
+static void
+copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+                     GLint width, GLint height,
+                     GLint destx, GLint desty )
+{
+   struct gl_renderbuffer *rb
+      = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
+   GLint sy, dy, stepy;
+   GLint j;
+   GLstencil *p, *tmpImage;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
+   GLint overlapping;
+
+   if (!ctx->Visual.stencilBits) {
+      _mesa_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
+      return;
+   }
+
+   if (!rb) {
+      /* no readbuffer - OK */
+      return;
+   }
+
+   /* Determine if copy should be bottom-to-top or top-to-bottom */
+   if (srcy < desty) {
+      /* top-down  max-to-min */
+      sy = srcy + height - 1;
+      dy = desty + height - 1;
+      stepy = -1;
+   }
+   else {
+      /* bottom-up  min-to-max */
+      sy = srcy;
+      dy = desty;
+      stepy = 1;
+   }
+
+   if (ctx->DrawBuffer == ctx->ReadBuffer) {
+      overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                    ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+   }
+   else {
+      overlapping = GL_FALSE;
+   }
+
+   if (overlapping) {
+      GLint ssy = sy;
+      tmpImage = (GLstencil *) MALLOC(width * height * sizeof(GLstencil));
+      if (!tmpImage) {
+         _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      p = tmpImage;
+      for (j = 0; j < height; j++, ssy += stepy) {
+         _swrast_read_stencil_span( ctx, rb, width, srcx, ssy, p );
+         p += width;
+      }
+      p = tmpImage;
+   }
+   else {
+      tmpImage = NULL;  /* silence compiler warning */
+      p = NULL;
+   }
+
+   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+      GLstencil stencil[MAX_WIDTH];
+
+      /* Get stencil values */
+      if (overlapping) {
+         MEMCPY(stencil, p, width * sizeof(GLstencil));
+         p += width;
+      }
+      else {
+         _swrast_read_stencil_span( ctx, rb, width, srcx, sy, stencil );
+      }
+
+      /* Apply shift, offset, look-up table */
+      if (shift_or_offset) {
+         _mesa_shift_and_offset_stencil( ctx, width, stencil );
+      }
+      if (ctx->Pixel.MapStencilFlag) {
+         _mesa_map_stencil( ctx, width, stencil );
+      }
+
+      /* Write stencil values */
+      if (zoom) {
+         _swrast_write_zoomed_stencil_span( ctx, width, destx, dy,
+                                          stencil, desty, 0 );
+      }
+      else {
+         _swrast_write_stencil_span( ctx, width, destx, dy, stencil );
+      }
+   }
+
+   if (overlapping)
+      FREE(tmpImage);
+}
+
+
+
+void
+_swrast_CopyPixels( GLcontext *ctx,
+		    GLint srcx, GLint srcy, GLsizei width, GLsizei height,
+		    GLint destx, GLint desty,
+		    GLenum type )
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   RENDER_START(swrast,ctx);
+      
+   if (swrast->NewState)
+      _swrast_validate_derived( ctx );
+
+   if (type == GL_COLOR && ctx->Visual.rgbMode) {
+      copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
+   }
+   else if (type == GL_COLOR && !ctx->Visual.rgbMode) {
+      copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
+   }
+   else if (type == GL_DEPTH) {
+      copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
+   }
+   else if (type == GL_STENCIL) {
+      copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
+   }
+   else {
+      _mesa_error( ctx, GL_INVALID_ENUM, "glCopyPixels" );
+   }
+
+   RENDER_FINISH(swrast,ctx);
+}