[gtk] gl renderer: Increase offscreen texture size

[Timm Bäder <baedert src gnome org>]

commit ad776cc57bd3490a9881d4ab6ade972bef410f24
Author: Timm Bäder <mail baedert org>
Date:   Fri Feb 16 18:00:06 2018 +0100

    gl renderer: Increase offscreen texture size
    
    This fixes blurry checkbutton marks in hidpi setups, but breaks button
    hover effects. That's another problem.

 gsk/gl/gskglrenderer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gsk/gl/gskglrenderer.c b/gsk/gl/gskglrenderer.c
index 51cd61ee0e..f72fdc3076 100644
--- a/gsk/gl/gskglrenderer.c
+++ b/gsk/gl/gskglrenderer.c
@@ -2167,8 +2167,8 @@ add_offscreen_ops (GskGLRenderer   *self,
                    gboolean        *is_offscreen,
                    gboolean         force_offscreen)
 {
-  const float width = max_x - min_x;
-  const float height = max_y - min_y;
+  const float width = (max_x - min_x) * self->scale_factor;
+  const float height = (max_y - min_y) * self->scale_factor;
   int render_target;
   int prev_render_target;
   RenderOp op;