[gtk/wip/baedert/gl-rework] gl renderer: Add builder offset correctly for non-affine modelviews

[Timm Bäder <baedert src gnome org>]

commit bc266d00dc1f7d20ab0ec89eab40ee806243fad2
Author: Timm Bäder <mail baedert org>
Date:   Tue Jan 21 10:00:51 2020 +0100

    gl renderer: Add builder offset correctly for non-affine modelviews

 gsk/gl/gskglrenderops.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/gsk/gl/gskglrenderops.c b/gsk/gl/gskglrenderops.c
index 39916be36c..f113df5edf 100644
--- a/gsk/gl/gskglrenderops.c
+++ b/gsk/gl/gskglrenderops.c
@@ -180,13 +180,15 @@ ops_transform_bounds_modelview (const RenderOpBuilder *builder,
                                 const graphene_rect_t *src,
                                 graphene_rect_t       *dst)
 {
+  graphene_rect_t r = *src;
+
   g_assert (builder->mv_stack != NULL);
   g_assert (builder->mv_stack->len >= 1);
 
-  gsk_transform_transform_bounds (builder->current_modelview, src, dst);
+  r.origin.x += builder->dx;
+  r.origin.y += builder->dy;
 
-  dst->origin.x += builder->dx * builder->scale_x;
-  dst->origin.y += builder->dy * builder->scale_y;
+  gsk_transform_transform_bounds (builder->current_modelview, &r, dst);
 }
 
 void