[gtk+] gsk: Take scale factor into account when setting up the gl scissor

[Alexander Larsson <alexl src gnome org>]

commit e307a35c33056dec559874829f4e0debd85a2bd0
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Mar 20 10:52:58 2017 +0100

    gsk: Take scale factor into account when setting up the gl scissor

 gsk/gskglrenderer.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/gsk/gskglrenderer.c b/gsk/gskglrenderer.c
index deeabbc..d323667 100644
--- a/gsk/gskglrenderer.c
+++ b/gsk/gskglrenderer.c
@@ -908,8 +908,13 @@ gsk_gl_renderer_setup_render_mode (GskGLRenderer *self)
         GdkDrawingContext *context = gsk_renderer_get_drawing_context (GSK_RENDERER (self));
         GdkWindow *window = gsk_renderer_get_window (GSK_RENDERER (self));
         GdkRectangle extents;
+        int scale_factor = gsk_renderer_get_scale_factor (GSK_RENDERER (self));
+
         cairo_region_get_extents (gdk_drawing_context_get_clip (context), &extents);
-        glScissor (extents.x, gdk_window_get_height (window) - extents.height - extents.y, extents.width, 
extents.height);
+
+        glScissor (extents.x * scale_factor,
+                   (gdk_window_get_height (window) - extents.height - extents.y) * scale_factor,
+                   extents.width * scale_factor, extents.height * scale_factor);
         glEnable (GL_SCISSOR_TEST);
         break;
       }