[gtk] gl renderer: Fix hidpi transform nodes

[Timm Bäder <baedert src gnome org>]

commit cfa440bbaec8dacc658012a2970bca0601f700eb
Author: Timm Bäder <mail baedert org>
Date:   Sun Jan 6 10:59:01 2019 +0100

    gl renderer: Fix hidpi transform nodes

 gsk/gl/gskglrenderer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/gsk/gl/gskglrenderer.c b/gsk/gl/gskglrenderer.c
index 945c4dfc5a..3936e83af3 100644
--- a/gsk/gl/gskglrenderer.c
+++ b/gsk/gl/gskglrenderer.c
@@ -779,12 +779,14 @@ render_transform_node (GskGLRenderer   *self,
                        GskRenderNode   *node,
                        RenderOpBuilder *builder)
 {
+  const float scale = ops_get_scale (builder);
   GskRenderNode *child = gsk_transform_node_get_child (node);
   graphene_matrix_t transform, transformed_mv;
 
   graphene_matrix_init_from_matrix (&transform, gsk_transform_node_peek_transform (node));
   graphene_matrix_multiply (&transform, builder->current_modelview, &transformed_mv);
-  graphene_matrix_translate (&transformed_mv, &(graphene_point3d_t) { builder->dx, builder->dy, 0});
+  graphene_matrix_translate (&transformed_mv,
+                             &(graphene_point3d_t) { builder->dx * scale, builder->dy * scale, 0});
 
   /* We just added the offset to the new modelview matrix, so the following
    * cases dont' have to care about builder->dx/dy! */