1 files changed, 50 insertions, 0 deletions
diff --git a/cc/layers/contents_scaling_layer.cc b/cc/layers/contents_scaling_layer.cc
new file mode 100644
index 0000000..d602e88
--- /dev/null
+++ b/cc/layers/contents_scaling_layer.cc
@@ -0,0 +1,50 @@
+// Copyright 2012 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/contents_scaling_layer.h"
+#include "ui/gfx/size_conversions.h"
+
+namespace cc {
+
+gfx::Size ContentsScalingLayer::ComputeContentBoundsForScale(
+    float scale_x,
+    float scale_y) const {
+  return gfx::ToCeiledSize(gfx::ScaleSize(bounds(), scale_x, scale_y));
+}
+
+ContentsScalingLayer::ContentsScalingLayer()
+    : last_update_contents_scale_x_(0.f),
+      last_update_contents_scale_y_(0.f) {}
+
+ContentsScalingLayer::~ContentsScalingLayer() {
+}
+
+void ContentsScalingLayer::CalculateContentsScale(
+    float ideal_contents_scale,
+    bool animating_transform_to_screen,
+    float* contents_scale_x,
+    float* contents_scale_y,
+    gfx::Size* content_bounds) {
+  *contents_scale_x = ideal_contents_scale;
+  *contents_scale_y = ideal_contents_scale;
+  *content_bounds = ComputeContentBoundsForScale(
+      ideal_contents_scale,
+      ideal_contents_scale);
+}
+
+void ContentsScalingLayer::Update(
+    ResourceUpdateQueue* queue,
+    const OcclusionTracker* occlusion,
+    RenderingStats* stats) {
+  if (draw_properties().contents_scale_x == last_update_contents_scale_x_ &&
+      draw_properties().contents_scale_y == last_update_contents_scale_y_)
+    return;
+
+  last_update_contents_scale_x_ = draw_properties().contents_scale_x;
+  last_update_contents_scale_y_ = draw_properties().contents_scale_y;
+  // Invalidate the whole layer if scale changed.
+  SetNeedsDisplayRect(gfx::Rect(bounds()));
+}
+
+}  // namespace cc