Explicitly specify contents scale for SurfaceLayer.

cc/layers/surface_layer.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/surface_layer.h"
 
 #include "cc/base/swap_promise.h"
 #include "cc/layers/surface_layer_impl.h"
 #include "cc/trees/layer_tree_host.h"
 
@@ skipping 26 matching lines @@
 scoped_refptr<SurfaceLayer> SurfaceLayer::Create(
     const SatisfyCallback& satisfy_callback,
     const RequireCallback& require_callback) {
   return make_scoped_refptr(
       new SurfaceLayer(satisfy_callback, require_callback));
 }
 
 SurfaceLayer::SurfaceLayer(const SatisfyCallback& satisfy_callback,
                            const RequireCallback& require_callback)
     : Layer(),
+      surface_scale_(1.f),
       satisfy_callback_(satisfy_callback),
       require_callback_(require_callback) {
 }
 
 SurfaceLayer::~SurfaceLayer() {
   DCHECK(!layer_tree_host());
   DCHECK(destroy_sequence_.is_null());
 }
 
-void SurfaceLayer::SetSurfaceId(SurfaceId surface_id, const gfx::Size& size) {
+void SurfaceLayer::SetSurfaceId(SurfaceId surface_id,
+                                float scale,
+                                const gfx::Size& size) {
   SatisfyDestroySequence();
   surface_id_ = surface_id;
   surface_size_ = size;
+  surface_scale_ = scale;
   CreateNewDestroySequence();
 
   UpdateDrawsContent(HasDrawableContent());
   SetNeedsPushProperties();
 }
 
 scoped_ptr<LayerImpl> SurfaceLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
   return SurfaceLayerImpl::Create(tree_impl, id());
 }
 
@@ skipping 17 matching lines @@
   SurfaceLayerImpl* layer_impl = static_cast<SurfaceLayerImpl*>(layer);
 
   layer_impl->SetSurfaceId(surface_id_);
 }
 
 void SurfaceLayer::CalculateContentsScale(float ideal_contents_scale,
                                           float* contents_scale_x,
                                           float* contents_scale_y,
                                           gfx::Size* content_bounds) {
   *content_bounds = surface_size_;
-  *contents_scale_x =
-      bounds().IsEmpty() ? 1.f : static_cast<float>(content_bounds->width()) /
-                                     bounds().width();
-  *contents_scale_y =
-      bounds().IsEmpty() ? 1.f : static_cast<float>(content_bounds->height()) /
-                                     bounds().height();
+  *contents_scale_x = surface_scale_;
+  *contents_scale_y = surface_scale_;
 }
 
 void SurfaceLayer::CreateNewDestroySequence() {
   DCHECK(destroy_sequence_.is_null());
   if (layer_tree_host()) {
     destroy_sequence_ = layer_tree_host()->CreateSurfaceSequence();
     require_callback_.Run(surface_id_, destroy_sequence_);
   }
 }
 
 void SurfaceLayer::SatisfyDestroySequence() {
   if (!layer_tree_host())
     return;
   DCHECK(!destroy_sequence_.is_null());
   scoped_ptr<SatisfySwapPromise> satisfy(
       new SatisfySwapPromise(destroy_sequence_, satisfy_callback_));
   layer_tree_host()->QueueSwapPromise(satisfy.Pass());
   destroy_sequence_ = SurfaceSequence();
 }
 
 }  // namespace cc