cc/contents_scaling_layer.cc

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/contents_scaling_layer.h"
   6 #include "ui/gfx/size_conversions.h"
   7
   8 namespace cc {
   9
  10 gfx::Size ContentsScalingLayer::computeContentBoundsForScale(float scaleX, float scaleY) const {
  11   return gfx::ToCeiledSize(gfx::ScaleSize(bounds(), scaleX, scaleY));
  12 }
  13
  14 ContentsScalingLayer::ContentsScalingLayer()
  15     : last_update_contents_scale_x_(0.f)
  16     , last_update_contents_scale_y_(0.f)
  17  {
  18 }
  19
  20 ContentsScalingLayer::~ContentsScalingLayer() {
  21 }
  22
  23 void ContentsScalingLayer::calculateContentsScale(
  24     float ideal_contents_scale,
  25     bool animating_transform_to_screen,
  26     float* contents_scale_x,
  27     float* contents_scale_y,
  28     gfx::Size* content_bounds) {
  29   *contents_scale_x = ideal_contents_scale;
  30   *contents_scale_y = ideal_contents_scale;
  31   *content_bounds = computeContentBoundsForScale(
  32       ideal_contents_scale,
  33       ideal_contents_scale);
  34 }
  35
  36 void ContentsScalingLayer::didUpdateBounds() {
  37   drawProperties().content_bounds = computeContentBoundsForScale(
  38       contentsScaleX(),
  39       contentsScaleY());
  40 }
  41
  42 void ContentsScalingLayer::update(
  43     ResourceUpdateQueue& queue,
  44     const OcclusionTracker* occlusion,
  45     RenderingStats* stats) {
  46   if (drawProperties().contents_scale_x == last_update_contents_scale_x_ &&
  47       drawProperties().contents_scale_y == last_update_contents_scale_y_)
  48     return;
  49
  50   last_update_contents_scale_x_ = drawProperties().contents_scale_x;
  51   last_update_contents_scale_y_ = drawProperties().contents_scale_y;
  52   // Invalidate the whole layer if scale changed.
  53   setNeedsDisplayRect(gfx::Rect(bounds()));
  54 }
  55
  56 }  // namespace cc