cc/layers/picture_image_layer_impl.cc

   1 // Copyright 2013 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/layers/picture_image_layer_impl.h"
   6
   7 #include <algorithm>
   8
   9 #include "cc/debug/debug_colors.h"
  10 #include "cc/trees/layer_tree_impl.h"
  11
  12 namespace cc {
  13
  14 PictureImageLayerImpl::PictureImageLayerImpl(LayerTreeImpl* tree_impl,
  15                                              int id,
  16                                              bool is_mask)
  17     : PictureLayerImpl(tree_impl,
  18                        id,
  19                        is_mask,
  20                        new LayerImpl::SyncedScrollOffset) {
  21 }
  22
  23 PictureImageLayerImpl::~PictureImageLayerImpl() {
  24 }
  25
  26 const char* PictureImageLayerImpl::LayerTypeAsString() const {
  27   return "cc::PictureImageLayerImpl";
  28 }
  29
  30 scoped_ptr<LayerImpl> PictureImageLayerImpl::CreateLayerImpl(
  31     LayerTreeImpl* tree_impl) {
  32   return PictureImageLayerImpl::Create(tree_impl, id(), is_mask_);
  33 }
  34
  35 void PictureImageLayerImpl::GetDebugBorderProperties(
  36     SkColor* color, float* width) const {
  37   *color = DebugColors::ImageLayerBorderColor();
  38   *width = DebugColors::ImageLayerBorderWidth(layer_tree_impl());
  39 }
  40
  41 bool PictureImageLayerImpl::ShouldAdjustRasterScale() const {
  42   return false;
  43 }
  44
  45 void PictureImageLayerImpl::RecalculateRasterScales() {
  46   // Don't scale images during rastering to ensure image quality, save memory
  47   // and avoid frequent re-rastering on change of scale.
  48   raster_page_scale_ = 1.f;
  49   raster_device_scale_ = 1.f;
  50   raster_source_scale_ = std::max(1.f, MinimumContentsScale());
  51   raster_contents_scale_ = raster_source_scale_;
  52   // We don't need low res tiles.
  53   low_res_raster_contents_scale_ = raster_contents_scale_;
  54 }
  55
  56 void PictureImageLayerImpl::UpdateIdealScales() {
  57   ideal_contents_scale_ = 1.f;
  58   ideal_page_scale_ = 1.f;
  59   ideal_device_scale_ = 1.f;
  60   ideal_source_scale_ = 1.f;
  61 }
  62
  63 }  // namespace cc