r600g: allow copying between compatible un/compressed formats

See: `commit e82c527f1fc2f8ddc64954ecd06b0de3cea92e93`

which is where a block in src maps to a pixel in dst and vice versa.
    e.g. DXT1 <-> R32G32_UINT
         DXT5 <-> R32G32B32A32_UINT

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/gallium/drivers/r600/r600_blit.c

@@ -656,7 +656,8 @@ void r600_resource_copy_region(struct pipe_context *ctx,
 	util_blitter_default_dst_texture(&dst_templ, dst, dst_level, dstz);
 	util_blitter_default_src_texture(&src_templ, src, src_level);
 
-	if (util_format_is_compressed(src->format)) {
+	if (util_format_is_compressed(src->format) ||
+	    util_format_is_compressed(dst->format)) {
 		unsigned blocksize = util_format_get_blocksize(src->format);
 
 		if (blocksize == 8)