1 files changed, 5 insertions, 3 deletions
diff --git a/src/gallium/winsys/gdi/wmesa.c b/src/gallium/winsys/gdi/wmesa.c
index 0b93f8c4c3..86b085ab84 100644
--- a/src/gallium/winsys/gdi/wmesa.c
+++ b/src/gallium/winsys/gdi/wmesa.c
@@ -477,13 +477,15 @@ wm_surface_alloc_storage(struct pipe_winsys *winsys,
    surf->width = width;
    surf->height = height;
    surf->format = format;
-   surf->cpp = pf_get_size(format);
-   surf->pitch = round_up(width, alignment / surf->cpp);
+   pf_get_block(format, &surf->block);
+   surf->nblocksx = pf_get_nblocksx(&surf->block, width);
+   surf->nblocksy = pf_get_nblocksy(&surf->block, height);
+   surf->stride = round_up(surf->nblocksx * surf->block.size, alignment);
 
    assert(!surf->buffer);
    surf->buffer = winsys->buffer_create(winsys, alignment,
                                         PIPE_BUFFER_USAGE_PIXEL,
-                                        surf->pitch * surf->cpp * height);
+                                        surf->nblocksy * surf->stride);
    if(!surf->buffer)
       return -1;