From: Richard Sandiford Date: Tue, 18 Jun 2013 15:41:43 +0000 (+0100) Subject: st/dri/sw: Fix pitch calculation in drisw_update_tex_buffer X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5a0556f061d9db00dd7637433d393beead3b3d85;p=mesa.git st/dri/sw: Fix pitch calculation in drisw_update_tex_buffer swrastGetImage rounds the pitch up to 4 bytes for compatibility reasons that are explained in drisw_glx.c:bytes_per_line, so drisw_update_tex_buffer must do the same. Fixes window skew seen while running firefox over vnc on a 16-bit screen. NOTE: This is a candidate for the stable branches. [ajax: fixed typo in comment] Reviewed-by: Stéphane Marchesin Signed-off-by: Richard Sandiford --- diff --git a/src/gallium/state_trackers/dri/sw/drisw.c b/src/gallium/state_trackers/dri/sw/drisw.c index 7a5f79716c0..41f66d5e4d4 100644 --- a/src/gallium/state_trackers/dri/sw/drisw.c +++ b/src/gallium/state_trackers/dri/sw/drisw.c @@ -265,8 +265,9 @@ drisw_update_tex_buffer(struct dri_drawable *drawable, /* Copy the Drawable content to the mapped texture buffer */ get_image(dPriv, x, y, w, h, map); - /* The pipe transfer has a pitch rounded up to the nearest 64 pixels. */ - ximage_stride = w * cpp; + /* The pipe transfer has a pitch rounded up to the nearest 64 pixels. + get_image() has a pitch rounded up to 4 bytes. */ + ximage_stride = ((w * cpp) + 3) & -4; for (line = h-1; line; --line) { memmove(&map[line * transfer->stride], &map[line * ximage_stride],