mesa: add common format-independent memcpy-based ReadPixels path

I'll need the _mesa_readpixels_needs_slow_path function for the blit-based
version, but it's also useful to have this memcpy-based path in one place
and not scattered across several functions.

v2: add "const" to function parameters

Reviewed-by: Brian Paul <brianp@vmware.com>
Tested-by: Brian Paul <brianp@vmware.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c
index d3abc2b..619aaa3 100644
--- a/src/mesa/main/framebuffer.c
+++ b/src/mesa/main/framebuffer.c
@@ -923,10 +923,10 @@ _mesa_get_color_read_type(struct gl_context *ctx)
  * Returns the read renderbuffer for the specified format.
  */
 struct gl_renderbuffer *
-_mesa_get_read_renderbuffer_for_format(struct gl_context *ctx,
+_mesa_get_read_renderbuffer_for_format(const struct gl_context *ctx,
                                        GLenum format)
 {
-   struct gl_framebuffer *rfb = ctx->ReadBuffer;
+   const struct gl_framebuffer *rfb = ctx->ReadBuffer;
 
    if (_mesa_is_color_format(format)) {
       return rfb->Attachment[rfb->_ColorReadBufferIndex].Renderbuffer;