From: Marek Olšák <maraeo@gmail.com>
Date: Mon, 4 Mar 2013 12:26:51 +0000 (+0100)
Subject: mesa: don't allocate a texture if width or height is 0 in CopyTexImage
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4b69c1a92d4e1a03377a91548e0a99c3cf3dfea1;p=mesa.git

mesa: don't allocate a texture if width or height is 0 in CopyTexImage

NOTE: This is a candidate for the stable branches.

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

diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index 7d996da4708..4042e7969e0 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -3495,19 +3495,21 @@ copyteximage(struct gl_context *ctx, GLuint dims,
          _mesa_init_teximage_fields(ctx, texImage, width, height, 1,
                                     border, internalFormat, texFormat);
 
-         /* Allocate texture memory (no pixel data yet) */
-         ctx->Driver.AllocTextureImageBuffer(ctx, texImage);
+         if (width && height) {
+            /* Allocate texture memory (no pixel data yet) */
+            ctx->Driver.AllocTextureImageBuffer(ctx, texImage);
 
-         if (_mesa_clip_copytexsubimage(ctx, &dstX, &dstY, &srcX, &srcY,
-                                        &width, &height)) {
-            struct gl_renderbuffer *srcRb =
-               get_copy_tex_image_source(ctx, texImage->TexFormat);
+            if (_mesa_clip_copytexsubimage(ctx, &dstX, &dstY, &srcX, &srcY,
+                                           &width, &height)) {
+               struct gl_renderbuffer *srcRb =
+                  get_copy_tex_image_source(ctx, texImage->TexFormat);
 
-            ctx->Driver.CopyTexSubImage(ctx, dims, texImage, dstX, dstY, dstZ,
-                                        srcRb, srcX, srcY, width, height);
-         }
+               ctx->Driver.CopyTexSubImage(ctx, dims, texImage, dstX, dstY, dstZ,
+                                           srcRb, srcX, srcY, width, height);
+            }
 
-         check_gen_mipmap(ctx, target, texObj, level);
+            check_gen_mipmap(ctx, target, texObj, level);
+         }
 
          _mesa_update_fbo_texture(ctx, texObj, face, level);