[gtk+] gdk_gl_texture_from_surface: Enable scissor test

[Alexander Larsson <alexl src gnome org>]

commit 61eabc4778971e17ef34cf5774762da11d0ff450
Author: Alexander Larsson <alexl redhat com>
Date:   Thu Nov 6 20:37:10 2014 +0100

    gdk_gl_texture_from_surface: Enable scissor test

 gdk/gdkgl.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkgl.c b/gdk/gdkgl.c
index b962508..17a3a89 100644
--- a/gdk/gdkgl.c
+++ b/gdk/gdkgl.c
@@ -692,6 +692,7 @@ gdk_gl_texture_from_surface (cairo_surface_t *surface,
 
   glBindTexture (target, texture_id);
   glEnable (target);
+  glEnable (GL_SCISSOR_TEST);
 
   glTexParameteri (target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri (target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
@@ -743,6 +744,7 @@ gdk_gl_texture_from_surface (cairo_surface_t *surface,
                            umax, vmax);
     }
 
+  glDisable (GL_SCISSOR_TEST);
   glDisable (target);
   glDeleteTextures (1, &texture_id);
 }