wined3d: Allow decompression blits on system memory resources in ffp_blit_supported().

dlls/wined3d/surface.c

@@ -2930,7 +2930,11 @@ static BOOL ffp_blit_supported(const struct wined3d_gl_info *gl_info,
         const RECT *src_rect, DWORD src_usage, enum wined3d_pool src_pool, const struct wined3d_format *src_format,
         const RECT *dst_rect, DWORD dst_usage, enum wined3d_pool dst_pool, const struct wined3d_format *dst_format)
 {
-    if (src_pool == WINED3D_POOL_SYSTEM_MEM || dst_pool == WINED3D_POOL_SYSTEM_MEM)
+    BOOL decompress;
+
+    decompress = src_format && (src_format->flags[WINED3D_GL_RES_TYPE_TEX_2D] & WINED3DFMT_FLAG_COMPRESSED)
+            && !(dst_format->flags[WINED3D_GL_RES_TYPE_TEX_2D] & WINED3DFMT_FLAG_COMPRESSED);
+    if (!decompress && (src_pool == WINED3D_POOL_SYSTEM_MEM || dst_pool == WINED3D_POOL_SYSTEM_MEM))
     {
         TRACE("Source or destination is in system memory.\n");
         return FALSE;