no-op glCopyPixels if width or height is zero

diff --git a/src/mesa/main/drawpix.c b/src/mesa/main/drawpix.c
index e4be0d4..ae9c7e2 100644 (file)
--- a/src/mesa/main/drawpix.c
+++ b/src/mesa/main/drawpix.c
@@ -239,7 +239,7 @@ _mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
       return;
    }
 
-   if (!ctx->Current.RasterPosValid) {
+   if (!ctx->Current.RasterPosValid || width ==0 || height == 0) {
       return;
    }