[gtk+/wip/baedert/gl: 87/94] gl renderer: Ensure texture sizes arent 0

[Timm Bäder <baedert src gnome org>]

commit f419ec10b1097bab448d528c8fb1f6405825b605
Author: Timm Bäder <mail baedert org>
Date:   Sat Dec 9 14:31:10 2017 +0100

    gl renderer: Ensure texture sizes arent 0
    
    We already ceil() the given float texture sizes here, so if they are
    valid, the result should definitely be > 0. Textures with size 0 can't
    be properly used, especially not as render targets, where they will
    trigger an assertion failure later in a glCheckFramebuffer call.

 gsk/gl/gskgldriver.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gsk/gl/gskgldriver.c b/gsk/gl/gskgldriver.c
index 9b49ebe..999b3af 100644
--- a/gsk/gl/gskgldriver.c
+++ b/gsk/gl/gskgldriver.c
@@ -429,6 +429,9 @@ create_texture (GskGLDriver *self,
   int width = ceilf (fwidth);
   int height = ceilf (fheight);
 
+  g_assert (width > 0);
+  g_assert (height > 0);
+
   if (width >= self->max_texture_size ||
       height >= self->max_texture_size)
     {