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-rw-r--r--src/mesa/main/image.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mesa/main/image.c b/src/mesa/main/image.c
index f781687c0fa..17737cafcfd 100644
--- a/src/mesa/main/image.c
+++ b/src/mesa/main/image.c
@@ -4063,6 +4063,7 @@ _mesa_unpack_image( GLsizei width, GLsizei height, GLsizei depth,
* Perform clipping for glDrawPixels. The image's window position
* and size, and the unpack skipPixels and skipRows are adjusted so
* that the image region is entirely within the window and scissor bounds.
+ * NOTE: this will only work when glPixelZoom is (1, 1).
*
* \return GL_TRUE if image is ready for drawing or
* GL_FALSE if image was completely clipped away (draw nothing)
@@ -4075,6 +4076,8 @@ _mesa_clip_drawpixels(const GLcontext *ctx,
{
const GLframebuffer *buffer = ctx->DrawBuffer;
+ ASSERT(ctx->Pixel.ZoomX == 1.0F && ctx->Pixel.ZoomY == 1.0F);
+
/* left clipping */
if (*destX < buffer->_Xmin) {
*skipPixels += (buffer->_Xmin - *destX);