[Mesa-dev] [PATCH 11/24] swrast: Calculate image address/stride once for depth/stencil readpixels.

[Eric Anholt]

The fast and slow paths were doing these separately before.
---
 src/mesa/swrast/s_readpix.c |   30 ++++++++++++++----------------
 1 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/src/mesa/swrast/s_readpix.c b/src/mesa/swrast/s_readpix.c
index c0bb399..7b74ed3 100644
--- a/src/mesa/swrast/s_readpix.c
+++ b/src/mesa/swrast/s_readpix.c
@@ -400,14 +400,13 @@ static GLboolean
 fast_read_depth_stencil_pixels(struct gl_context *ctx,
                               GLint x, GLint y,
                               GLsizei width, GLsizei height,
-                              GLenum type, GLvoid *pixels,
-                              const struct gl_pixelstore_attrib *packing)
+                              GLenum type, GLvoid *dst, int dstStride)
 {
    struct gl_framebuffer *fb = ctx->ReadBuffer;
    struct gl_renderbuffer *rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
    struct gl_renderbuffer *stencilRb = 
fb->Attachment[BUFFER_DEPTH].Renderbuffer;
-   GLubyte *dst, *map;
-   int stride, dstStride, i;
+   GLubyte *map;
+   int stride, i;
 
    if (rb != stencilRb)
       return GL_FALSE;
@@ -422,13 +421,6 @@ fast_read_depth_stencil_pixels(struct gl_context *ctx,
    ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
                               &map, &stride);
 
-   dstStride = _mesa_image_row_stride(packing, width,
-                                     GL_DEPTH_STENCIL_EXT, type);
-   dst = (GLubyte *) _mesa_image_address2d(packing, pixels,
-                                          width, height,
-                                          GL_DEPTH_STENCIL_EXT,
-                                          type, 0, 0);
-
    for (i = 0; i < height; i++) {
       memcpy(dst, map, width * 4);
 
@@ -469,6 +461,8 @@ read_depth_stencil_pixels(struct gl_context *ctx,
    const GLboolean stencilTransfer = ctx->Pixel.IndexShift
       || ctx->Pixel.IndexOffset || ctx->Pixel.MapStencilFlag;
    struct gl_renderbuffer *depthRb, *stencilRb;
+   GLubyte *dst;
+   int dstStride;
 
    depthRb = ctx->ReadBuffer->_DepthBuffer;
    stencilRb = ctx->ReadBuffer->_StencilBuffer;
@@ -476,9 +470,16 @@ read_depth_stencil_pixels(struct gl_context *ctx,
    if (!depthRb || !stencilRb)
       return;
 
+   dst = (GLubyte *) _mesa_image_address2d(packing, pixels,
+                                          width, height,
+                                          GL_DEPTH_STENCIL_EXT,
+                                          type, 0, 0);
+   dstStride = _mesa_image_row_stride(packing, width,
+                                     GL_DEPTH_STENCIL_EXT, type);
+
    if (!scaleOrBias && !stencilTransfer && !packing->SwapBytes) {
       if (fast_read_depth_stencil_pixels(ctx, x, y, width, height, type,
-                                        pixels, packing))
+                                        dst, dstStride))
         return;
    }
 
@@ -490,10 +491,7 @@ read_depth_stencil_pixels(struct gl_context *ctx,
 
       for (i = 0; i < height; i++) {
          GLstencil stencilVals[MAX_WIDTH];
-
-         GLuint *depthStencilDst = (GLuint *)
-            _mesa_image_address2d(packing, pixels, width, height,
-                                  GL_DEPTH_STENCIL_EXT, type, i, 0);
+         GLuint *depthStencilDst = (GLuint *) (dst + dstStride * i);
 
          _swrast_read_stencil_span(ctx, stencilRb, width,
                                    x, y + i, stencilVals);
-- 
1.7.7

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