[gtk] gl renderer: Round size up when rendering to a texture

[Timm Bäder <baedert src gnome org>]

commit f9041230c65e15e6bb1260445ba06456d855dd48
Author: Timm Bäder <mail baedert org>
Date:   Sat Feb 23 04:50:25 2019 +0100

    gl renderer: Round size up when rendering to a texture
    
    Both the clip we use and the viewport we set should contain the entire
    texture size and not potentially clip the last pixel.

 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 27df97fc9e..24f5452491 100644
--- a/gsk/gl/gskglrenderer.c
+++ b/gsk/gl/gskglrenderer.c
@@ -2458,8 +2458,8 @@ add_offscreen_ops (GskGLRenderer         *self,
                    guint                  flags)
 {
   const float scale = ops_get_scale (builder);
-  const float width  = bounds->size.width  * scale;
-  const float height = bounds->size.height * scale;
+  const float width  = ceilf (bounds->size.width  * scale);
+  const float height = ceilf (bounds->size.height * scale);
   const float dx = builder->dx;
   const float dy = builder->dy;
   int render_target;