Update WR.

- Subpixel positioning improvements.
- Clipping fixes and optimizations.
- Fix panic when transform can't be inverted.
- Support multiple filters on single stacking context.
- Optimize gradients, support unlimited stops.
- Add external image + texture cache support.
- Support error path on shader compile error.
- Optimize border handling in texture atlas.
- Preliminary work towards clip/scroll root changes.

components/compositing/compositor.rs

@@ -361,11 +361,6 @@ impl webrender_traits::RenderNotifier for RenderNotifier {
     fn new_scroll_frame_ready(&mut self, composite_needed: bool) {
         self.compositor_proxy.send(Msg::NewScrollFrameReady(composite_needed));
     }
-
-    fn pipeline_size_changed(&mut self,
-                             _: webrender_traits::PipelineId,
-                             _: Option<webrender_traits::LayoutSize>) {
-    }
 }
 
 // Used to dispatch functions from webrender to the main thread's event loop.

components/layout/webrender_helpers.rs

@@ -229,8 +229,8 @@ impl WebRenderDisplayItemConverter for DisplayItem {
                             let glyph_offset = glyph.offset().unwrap_or(Point2D::zero());
                             let glyph = webrender_traits::GlyphInstance {
                                 index: glyph.id(),
-                                x: (origin.x + glyph_offset.x).to_f32_px(),
-                                y: (origin.y + glyph_offset.y).to_f32_px(),
+                                point: Point2D::new((origin.x + glyph_offset.x).to_f32_px(),
+                                                    (origin.y + glyph_offset.y).to_f32_px()),
                             };
                             glyphs.push(glyph);
                         }
@@ -354,7 +354,11 @@ impl WebRenderDisplayItemConverter for DisplayItem {
             }
             DisplayItem::PopStackingContext(_) => builder.pop_stacking_context(),
             DisplayItem::PushScrollRoot(ref item) => {
-                builder.push_scroll_layer(item.scroll_root.clip.to_rectf(),
+                let clip = builder.new_clip_region(&item.scroll_root.clip.to_rectf(),
+                                                   vec![],
+                                                   None);
+
+                builder.push_scroll_layer(clip,
                                           item.scroll_root.size.to_sizef(),
                                           item.scroll_root.id.convert_to_webrender());
             }

components/servo/lib.rs

@@ -184,7 +184,7 @@ impl<Window> Browser<Window> where Window: WindowMethods + 'static {
                 clear_framebuffer: true,
                 clear_color: webrender_traits::ColorF::new(1.0, 1.0, 1.0, 1.0),
                 render_target_debug: false,
-            }).unwrap()
+            }).expect("Unable to initialize webrender!")
         };
 
         // Important that this call is done in a single-threaded fashion, we