From 7b9bf395433b5fa9d5a95186891a29d49e0b47c0 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Thu, 2 Apr 2009 13:05:55 -0600
Subject: [PATCH] mesa: don't call ctx->Driver.ReadPixels() if width or height
 is zero

---
 src/mesa/main/readpix.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
index dfdd297b6e7..2326776ecbf 100644
--- a/src/mesa/main/readpix.c
+++ b/src/mesa/main/readpix.c
@@ -170,6 +170,9 @@ _mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height,
       return;
    }
 
+   if (width == 0 || height == 0)
+      return; /* nothing to do */
+
    if (ctx->Pack.BufferObj->Name) {
       if (!_mesa_validate_pbo_access(2, &ctx->Pack, width, height, 1,
                                      format, type, pixels)) {
-- 
2.30.2