Mesa (7.8): st/mesa: fix incorrect RowStride computation

[Brian Paul]

Module: Mesa
Branch: 7.8
Commit: 7b640f9f708306b3e8c661771f29bf24bf8687fb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7b640f9f708306b3e8c661771f29bf24bf8687fb

Author: Brian Paul <brianp at vmware.com>
Date:   Wed Apr 28 10:06:05 2010 -0600

st/mesa: fix incorrect RowStride computation

Fixes incorrect stride when getting a compressed tex image.

---

 src/mesa/state_tracker/st_cb_texture.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/src/mesa/state_tracker/st_cb_texture.c b/src/mesa/state_tracker/st_cb_texture.c
index 92eefca..61d3f0f 100644
--- a/src/mesa/state_tracker/st_cb_texture.c
+++ b/src/mesa/state_tracker/st_cb_texture.c
@@ -931,7 +931,10 @@ st_get_tex_image(GLcontext * ctx, GLenum target, GLint level,
                                             PIPE_TRANSFER_READ, 0, 0,
                                             stImage->base.Width,
                                             stImage->base.Height);
-      texImage->RowStride = stImage->transfer->stride / util_format_get_blocksize(stImage->pt->format);
+      /* compute stride in texels from stride in bytes */
+      texImage->RowStride = stImage->transfer->stride
+         * util_format_get_blockwidth(stImage->pt->format)
+         / util_format_get_blocksize(stImage->pt->format);
    }
    else {
       /* Otherwise, the image should actually be stored in