X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fswrast%2Fs_copypix.c;h=e21c69dbcfa0dc3ddf7f9908c3e35ba887d21509;hb=c472793a2a55bb529bf4297f04ff785ce52cfc6e;hp=3bdf48b25f10da9b13c2ce1d9c4e109d9d21df76;hpb=24e648490921a386fc3f65d1b1ed330067a4bb25;p=mesa.git

diff --git a/src/mesa/swrast/s_copypix.c b/src/mesa/swrast/s_copypix.c
index 3bdf48b25f1..e21c69dbcfa 100644
--- a/src/mesa/swrast/s_copypix.c
+++ b/src/mesa/swrast/s_copypix.c
@@ -1,6 +1,5 @@
 /*
  * Mesa 3-D graphics library
- * Version:  7.1
  *
  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
  *
@@ -17,9 +16,10 @@
  * 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.
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
  */
 
 
@@ -136,10 +136,10 @@ copy_rgba_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,
    INIT_SPAN(span, GL_BITMAP);
    _swrast_span_default_attribs(ctx, &span);
    span.arrayMask = SPAN_RGBA;
-   span.arrayAttribs = FRAG_BIT_COL0; /* we'll fill in COL0 attrib values */
+   span.arrayAttribs = VARYING_BIT_COL0; /* we'll fill in COL0 attrib values */
 
    if (overlapping) {
-      tmpImage = (GLfloat *) malloc(width * height * sizeof(GLfloat) * 4);
+      tmpImage = malloc(width * height * sizeof(GLfloat) * 4);
       if (!tmpImage) {
          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
          return;
@@ -148,7 +148,7 @@ copy_rgba_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,
       p = tmpImage;
       for (row = 0; row < height; row++) {
          _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
-                                 width, srcx, sy + row, GL_FLOAT, p );
+                                 width, srcx, sy + row, p );
          p += width * 4;
       }
       p = tmpImage;
@@ -158,10 +158,10 @@ copy_rgba_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,
       p = NULL;
    }
 
-   ASSERT(width < MAX_WIDTH);
+   ASSERT(width < SWRAST_MAX_WIDTH);
 
    for (row = 0; row < height; row++, sy += stepy, dy += stepy) {
-      GLvoid *rgba = span.array->attribs[FRAG_ATTRIB_COL0];
+      GLvoid *rgba = span.array->attribs[VARYING_SLOT_COL0];
 
       /* Get row/span of source pixels */
       if (overlapping) {
@@ -172,7 +172,7 @@ copy_rgba_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,
       else {
          /* get from framebuffer */
          _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
-                                 width, srcx, sy, GL_FLOAT, rgba );
+                                 width, srcx, sy, rgba );
       }
 
       if (transferOps) {
@@ -245,8 +245,8 @@ copy_depth_pixels( struct gl_context *ctx, GLint srcx, GLint srcy,
                    GLint destx, GLint desty )
 {
    struct gl_framebuffer *fb = ctx->ReadBuffer;
-   struct gl_renderbuffer *readRb = fb->_DepthBuffer;
-   GLfloat *p, *tmpImage;
+   struct gl_renderbuffer *readRb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
+   GLfloat *p, *tmpImage, *depth;
    GLint sy, dy, stepy;
    GLint j;
    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
@@ -286,7 +286,7 @@ copy_depth_pixels( struct gl_context *ctx, GLint srcx, GLint srcy,
 
    if (overlapping) {
       GLint ssy = sy;
-      tmpImage = (GLfloat *) malloc(width * height * sizeof(GLfloat));
+      tmpImage = malloc(width * height * sizeof(GLfloat));
       if (!tmpImage) {
          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
          return;
@@ -303,8 +303,13 @@ copy_depth_pixels( struct gl_context *ctx, GLint srcx, GLint srcy,
       p = NULL;
    }
 
+   depth = malloc(width * sizeof(GLfloat));
+   if (!depth) {
+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels()");
+      goto end;
+   }
+
    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));
@@ -327,6 +332,9 @@ copy_depth_pixels( struct gl_context *ctx, GLint srcx, GLint srcy,
          _swrast_write_rgba_span(ctx, &span);
    }
 
+   free(depth);
+
+end:
    if (overlapping)
       free(tmpImage);
 }
@@ -339,10 +347,10 @@ copy_stencil_pixels( struct gl_context *ctx, GLint srcx, GLint srcy,
                      GLint destx, GLint desty )
 {
    struct gl_framebuffer *fb = ctx->ReadBuffer;
-   struct gl_renderbuffer *rb = fb->_StencilBuffer;
+   struct gl_renderbuffer *rb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
    GLint sy, dy, stepy;
    GLint j;
-   GLubyte *p, *tmpImage;
+   GLubyte *p, *tmpImage, *stencil;
    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
    GLint overlapping;
 
@@ -375,7 +383,7 @@ copy_stencil_pixels( struct gl_context *ctx, GLint srcx, GLint srcy,
 
    if (overlapping) {
       GLint ssy = sy;
-      tmpImage = (GLubyte *) malloc(width * height * sizeof(GLubyte));
+      tmpImage = malloc(width * height * sizeof(GLubyte));
       if (!tmpImage) {
          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
          return;
@@ -392,9 +400,13 @@ copy_stencil_pixels( struct gl_context *ctx, GLint srcx, GLint srcy,
       p = NULL;
    }
 
-   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
-      GLubyte stencil[MAX_WIDTH];
+   stencil = malloc(width * sizeof(GLubyte));
+   if (!stencil) {
+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels()");
+      goto end;
+   }
 
+   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
       /* Get stencil values */
       if (overlapping) {
          memcpy(stencil, p, width * sizeof(GLubyte));
@@ -416,209 +428,30 @@ copy_stencil_pixels( struct gl_context *ctx, GLint srcx, GLint srcy,
       }
    }
 
+   free(stencil);
+
+end:
    if (overlapping)
       free(tmpImage);
 }
 
 
 /**
- * This isn't terribly efficient.  If a driver really has combined
- * depth/stencil buffers the driver should implement an optimized
- * CopyPixels function.
+ * Try to do a fast 1:1 blit with memcpy.
+ * \return GL_TRUE if successful, GL_FALSE otherwise.
  */
-static void
-copy_depth_stencil_pixels(struct gl_context *ctx,
-                          const GLint srcX, const GLint srcY,
-                          const GLint width, const GLint height,
-                          const GLint destX, const GLint destY)
+GLboolean
+swrast_fast_copy_pixels(struct gl_context *ctx,
+                        struct gl_framebuffer *srcFb,
+                        struct gl_framebuffer *dstFb,
+                        GLint srcX, GLint srcY, GLsizei width, GLsizei height,
+                        GLint dstX, GLint dstY, GLenum type)
 {
-   struct gl_renderbuffer *stencilReadRb, *depthReadRb, *depthDrawRb;
-   GLint sy, dy, stepy;
-   GLint j;
-   GLubyte *tempStencilImage = NULL, *stencilPtr = NULL;
-   GLfloat *tempDepthImage = NULL, *depthPtr = NULL;
-   const GLfloat depthScale = ctx->DrawBuffer->_DepthMaxF;
-   const GLuint stencilMask = ctx->Stencil.WriteMask[0];
-   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
-   const GLboolean scaleOrBias
-      = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
-   GLint overlapping;
-
-   depthDrawRb = ctx->DrawBuffer->_DepthBuffer;
-   depthReadRb = ctx->ReadBuffer->_DepthBuffer;
-   stencilReadRb = ctx->ReadBuffer->_StencilBuffer;
-
-   ASSERT(depthDrawRb);
-   ASSERT(depthReadRb);
-   ASSERT(stencilReadRb);
-
-   if (ctx->DrawBuffer == ctx->ReadBuffer) {
-      overlapping = regions_overlap(srcX, srcY, destX, destY, width, height,
-                                    ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
-   }
-   else {
-      overlapping = GL_FALSE;
-   }
-
-   /* Determine if copy should be bottom-to-top or top-to-bottom */
-   if (!overlapping && 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 (overlapping) {
-      GLint ssy = sy;
-
-      if (stencilMask != 0x0) {
-         tempStencilImage
-            = (GLubyte *) malloc(width * height * sizeof(GLubyte));
-         if (!tempStencilImage) {
-            _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
-            return;
-         }
-
-         /* get copy of stencil pixels */
-         stencilPtr = tempStencilImage;
-         for (j = 0; j < height; j++, ssy += stepy) {
-            _swrast_read_stencil_span(ctx, stencilReadRb,
-                                      width, srcX, ssy, stencilPtr);
-            stencilPtr += width;
-         }
-         stencilPtr = tempStencilImage;
-      }
-
-      if (ctx->Depth.Mask) {
-         tempDepthImage
-            = (GLfloat *) malloc(width * height * sizeof(GLfloat));
-         if (!tempDepthImage) {
-            _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
-            free(tempStencilImage);
-            return;
-         }
-
-         /* get copy of depth pixels */
-         depthPtr = tempDepthImage;
-         for (j = 0; j < height; j++, ssy += stepy) {
-            _swrast_read_depth_span_float(ctx, depthReadRb,
-                                          width, srcX, ssy, depthPtr);
-            depthPtr += width;
-         }
-         depthPtr = tempDepthImage;
-      }
-   }
-
-   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
-      if (stencilMask != 0x0) {
-         GLubyte stencil[MAX_WIDTH];
-
-         /* Get stencil values */
-         if (overlapping) {
-            memcpy(stencil, stencilPtr, width * sizeof(GLubyte));
-            stencilPtr += width;
-         }
-         else {
-            _swrast_read_stencil_span(ctx, stencilReadRb,
-                                      width, srcX, sy, stencil);
-         }
-
-         _mesa_apply_stencil_transfer_ops(ctx, width, stencil);
-
-         /* Write values */
-         if (zoom) {
-            _swrast_write_zoomed_stencil_span(ctx, destX, destY, width,
-                                              destX, dy, stencil);
-         }
-         else {
-            _swrast_write_stencil_span( ctx, width, destX, dy, stencil );
-         }
-      }
-
-      if (ctx->Depth.Mask) {
-         GLfloat depth[MAX_WIDTH];
-         GLuint zVals32[MAX_WIDTH];
-         GLushort zVals16[MAX_WIDTH];
-         GLvoid *zVals;
-         GLuint zBytes;
-
-         /* get depth values */
-         if (overlapping) {
-            memcpy(depth, depthPtr, width * sizeof(GLfloat));
-            depthPtr += width;
-         }
-         else {
-            _swrast_read_depth_span_float(ctx, depthReadRb,
-                                          width, srcX, sy, depth);
-         }
-
-         /* scale & bias */
-         if (scaleOrBias) {
-            _mesa_scale_and_bias_depth(ctx, width, depth);
-         }
-         /* convert to integer Z values */
-         if (depthDrawRb->DataType == GL_UNSIGNED_SHORT) {
-            GLint k;
-            for (k = 0; k < width; k++)
-               zVals16[k] = (GLushort) (depth[k] * depthScale);
-            zVals = zVals16;
-            zBytes = 2;
-         }
-         else {
-            GLint k;
-            for (k = 0; k < width; k++)
-               zVals32[k] = (GLuint) (depth[k] * depthScale);
-            zVals = zVals32;
-            zBytes = 4;
-         }
-
-         /* Write values */
-         if (zoom) {
-            _swrast_write_zoomed_z_span(ctx, destX, destY, width,
-                                        destX, dy, zVals);
-         }
-         else {
-            _swrast_put_row(ctx, depthDrawRb, width, destX, dy, zVals, zBytes);
-         }
-      }
-   }
-
-   if (tempStencilImage)
-      free(tempStencilImage);
-
-   if (tempDepthImage)
-      free(tempDepthImage);
-}
-
-
-
-/**
- * Try to do a fast copy pixels.
- */
-static GLboolean
-fast_copy_pixels(struct gl_context *ctx,
-                 GLint srcX, GLint srcY, GLsizei width, GLsizei height,
-                 GLint dstX, GLint dstY, GLenum type)
-{
-   struct gl_framebuffer *srcFb = ctx->ReadBuffer;
-   struct gl_framebuffer *dstFb = ctx->DrawBuffer;
    struct gl_renderbuffer *srcRb, *dstRb;
-   GLint row, yStep;
-   void *temp;
-
-   if (SWRAST_CONTEXT(ctx)->_RasterMask != 0x0 ||
-       ctx->Pixel.ZoomX != 1.0F ||
-       ctx->Pixel.ZoomY != 1.0F ||
-       ctx->_ImageTransferState) {
-      /* can't handle these */
-      return GL_FALSE;
-   }
+   GLint row;
+   GLuint pixelBytes, widthInBytes;
+   GLubyte *srcMap, *dstMap;
+   GLint srcRowStride, dstRowStride;
 
    if (type == GL_COLOR) {
       if (dstFb->_NumColorDrawBuffers != 1)
@@ -627,12 +460,12 @@ fast_copy_pixels(struct gl_context *ctx,
       dstRb = dstFb->_ColorDrawBuffers[0];
    }
    else if (type == GL_STENCIL) {
-      srcRb = srcFb->_StencilBuffer;
-      dstRb = dstFb->_StencilBuffer;
+      srcRb = srcFb->Attachment[BUFFER_STENCIL].Renderbuffer;
+      dstRb = dstFb->Attachment[BUFFER_STENCIL].Renderbuffer;
    }
    else if (type == GL_DEPTH) {
-      srcRb = srcFb->_DepthBuffer;
-      dstRb = dstFb->_DepthBuffer;
+      srcRb = srcFb->Attachment[BUFFER_DEPTH].Renderbuffer;
+      dstRb = dstFb->Attachment[BUFFER_DEPTH].Renderbuffer;
    }
    else {
       ASSERT(type == GL_DEPTH_STENCIL_EXT);
@@ -641,13 +474,24 @@ fast_copy_pixels(struct gl_context *ctx,
       dstRb = dstFb->Attachment[BUFFER_DEPTH].Renderbuffer;
    }
 
-   /* src and dst renderbuffers must be same format and type */
-   if (!srcRb || !dstRb ||
-       srcRb->DataType != dstRb->DataType ||
-       srcRb->_BaseFormat != dstRb->_BaseFormat) {
+   /* src and dst renderbuffers must be same format */
+   if (!srcRb || !dstRb || srcRb->Format != dstRb->Format) {
       return GL_FALSE;
    }
 
+   if (type == GL_STENCIL || type == GL_DEPTH_COMPONENT) {
+      /* can't handle packed depth+stencil here */
+      if (_mesa_is_format_packed_depth_stencil(srcRb->Format) ||
+          _mesa_is_format_packed_depth_stencil(dstRb->Format))
+         return GL_FALSE;
+   }
+   else if (type == GL_DEPTH_STENCIL) {
+      /* can't handle separate depth/stencil buffers */
+      if (srcRb != srcFb->Attachment[BUFFER_STENCIL].Renderbuffer ||
+          dstRb != dstFb->Attachment[BUFFER_STENCIL].Renderbuffer)
+         return GL_FALSE;
+   }
+
    /* clipping not supported */
    if (srcX < 0 || srcX + width > (GLint) srcFb->Width ||
        srcY < 0 || srcY + height > (GLint) srcFb->Height ||
@@ -656,48 +500,132 @@ fast_copy_pixels(struct gl_context *ctx,
       return GL_FALSE;
    }
 
-   /* overlapping src/dst doesn't matter, just determine Y direction */
-   if (srcY < dstY) {
-      /* top-down  max-to-min */
-      srcY = srcY + height - 1;
-      dstY = dstY + height - 1;
-      yStep = -1;
+   pixelBytes = _mesa_get_format_bytes(srcRb->Format);
+   widthInBytes = width * pixelBytes;
+
+   if (srcRb == dstRb) {
+      /* map whole buffer for read/write */
+      /* XXX we could be clever and just map the union region of the
+       * source and dest rects.
+       */
+      GLubyte *map;
+      GLint rowStride;
+
+      ctx->Driver.MapRenderbuffer(ctx, srcRb, 0, 0,
+                                  srcRb->Width, srcRb->Height,
+                                  GL_MAP_READ_BIT | GL_MAP_WRITE_BIT,
+                                  &map, &rowStride);
+      if (!map) {
+         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+         return GL_TRUE; /* don't retry with slow path */
+      }
+
+      srcMap = map + srcY * rowStride + srcX * pixelBytes;
+      dstMap = map + dstY * rowStride + dstX * pixelBytes;
+
+      /* this handles overlapping copies */
+      if (srcY < dstY) {
+         /* copy in reverse (top->down) order */
+         srcMap += rowStride * (height - 1);
+         dstMap += rowStride * (height - 1);
+         srcRowStride = -rowStride;
+         dstRowStride = -rowStride;
+      }
+      else {
+         /* copy in normal (bottom->up) order */
+         srcRowStride = rowStride;
+         dstRowStride = rowStride;
+      }
    }
    else {
-      /* bottom-up  min-to-max */
-      yStep = 1;
-   }
-
-   temp = malloc(width * MAX_PIXEL_BYTES);
-   if (!temp) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
-      return GL_FALSE;
+      /* different src/dst buffers */
+      ctx->Driver.MapRenderbuffer(ctx, srcRb, srcX, srcY,
+                                  width, height,
+                                  GL_MAP_READ_BIT, &srcMap, &srcRowStride);
+      if (!srcMap) {
+         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+         return GL_TRUE; /* don't retry with slow path */
+      }
+      ctx->Driver.MapRenderbuffer(ctx, dstRb, dstX, dstY,
+                                  width, height,
+                                  GL_MAP_WRITE_BIT, &dstMap, &dstRowStride);
+      if (!dstMap) {
+         ctx->Driver.UnmapRenderbuffer(ctx, srcRb);
+         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+         return GL_TRUE; /* don't retry with slow path */
+      }
    }
 
    for (row = 0; row < height; row++) {
-      srcRb->GetRow(ctx, srcRb, width, srcX, srcY, temp);
-      dstRb->PutRow(ctx, dstRb, width, dstX, dstY, temp, NULL);
-      srcY += yStep;
-      dstY += yStep;
+      /* memmove() in case of overlap */
+      memmove(dstMap, srcMap, widthInBytes);
+      dstMap += dstRowStride;
+      srcMap += srcRowStride;
    }
 
-   free(temp);
+   ctx->Driver.UnmapRenderbuffer(ctx, srcRb);
+   if (dstRb != srcRb) {
+      ctx->Driver.UnmapRenderbuffer(ctx, dstRb);
+   }
 
    return GL_TRUE;
 }
 
 
+/**
+ * Find/map the renderbuffer that we'll be reading from.
+ * The swrast_render_start() function only maps the drawing buffers,
+ * not the read buffer.
+ */
+static struct gl_renderbuffer *
+map_readbuffer(struct gl_context *ctx, GLenum type)
+{
+   struct gl_framebuffer *fb = ctx->ReadBuffer;
+   struct gl_renderbuffer *rb;
+   struct swrast_renderbuffer *srb;
+
+   switch (type) {
+   case GL_COLOR:
+      rb = fb->Attachment[fb->_ColorReadBufferIndex].Renderbuffer;
+      break;
+   case GL_DEPTH:
+   case GL_DEPTH_STENCIL:
+      rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
+      break;
+   case GL_STENCIL:
+      rb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
+      break;
+   default:
+      return NULL;
+   }
+
+   srb = swrast_renderbuffer(rb);
+
+   if (!srb || srb->Map) {
+      /* no buffer, or buffer is mapped already, we're done */
+      return NULL;
+   }
+
+   ctx->Driver.MapRenderbuffer(ctx, rb,
+                               0, 0, rb->Width, rb->Height,
+                               GL_MAP_READ_BIT,
+                               &srb->Map, &srb->RowStride);
+
+   return rb;
+}
+
+
 /**
  * Do software-based glCopyPixels.
  * By time we get here, all parameters will have been error-checked.
  */
 void
-_swrast_CopyPixels( struct gl_context *ctx,
-		    GLint srcx, GLint srcy, GLsizei width, GLsizei height,
-		    GLint destx, GLint desty, GLenum type )
+_swrast_CopyPixels(struct gl_context *ctx,
+                   GLint srcx, GLint srcy, GLsizei width, GLsizei height,
+                   GLint destx, GLint desty, GLenum type)
 {
    SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   swrast_render_start(ctx);
+   struct gl_renderbuffer *rb;
       
    if (!_mesa_check_conditional_render(ctx))
       return; /* don't copy */
@@ -705,24 +633,44 @@ _swrast_CopyPixels( struct gl_context *ctx,
    if (swrast->NewState)
       _swrast_validate_derived( ctx );
 
-   if (!fast_copy_pixels(ctx, srcx, srcy, width, height, destx, desty, type)) {
-      switch (type) {
-      case GL_COLOR:
-         copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
-         break;
-      case GL_DEPTH:
-         copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
-         break;
-      case GL_STENCIL:
-         copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
-         break;
-      case GL_DEPTH_STENCIL_EXT:
-         copy_depth_stencil_pixels(ctx, srcx, srcy, width, height, destx, desty);
-         break;
-      default:
-         _mesa_problem(ctx, "unexpected type in _swrast_CopyPixels");
-      }
+   if (!(SWRAST_CONTEXT(ctx)->_RasterMask != 0x0 ||
+       ctx->Pixel.ZoomX != 1.0F ||
+       ctx->Pixel.ZoomY != 1.0F ||
+       ctx->_ImageTransferState) &&
+      swrast_fast_copy_pixels(ctx, ctx->ReadBuffer, ctx->DrawBuffer,
+                              srcx, srcy, width, height, destx, desty,
+                              type)) {
+      /* all done */
+      return;
+   }
+
+   swrast_render_start(ctx);
+   rb = map_readbuffer(ctx, type);
+
+   switch (type) {
+   case GL_COLOR:
+      copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
+      break;
+   case GL_DEPTH:
+      copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
+      break;
+   case GL_STENCIL:
+      copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
+      break;
+   case GL_DEPTH_STENCIL_EXT:
+      /* Copy buffers separately (if the fast copy path wasn't taken) */
+      copy_depth_pixels(ctx, srcx, srcy, width, height, destx, desty);
+      copy_stencil_pixels(ctx, srcx, srcy, width, height, destx, desty);
+      break;
+   default:
+      _mesa_problem(ctx, "unexpected type in _swrast_CopyPixels");
    }
 
    swrast_render_finish(ctx);
+
+   if (rb) {
+      struct swrast_renderbuffer *srb = swrast_renderbuffer(rb);
+      ctx->Driver.UnmapRenderbuffer(ctx, rb);
+      srb->Map = NULL;
+   }
 }