From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 9 Nov 2004 01:08:04 +0000 (+0000)
Subject: added a comment and assertion in _mesa_clip_drawpixels() for PixelZoom
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e677da9e54e836609f94a3aaca27d68a0bacbb96;p=mesa.git

added a comment and assertion in _mesa_clip_drawpixels() for PixelZoom
---

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);