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, int id)
  15     : PictureLayerImpl(tree_impl, id) {
  16 }
  17
  18 PictureImageLayerImpl::~PictureImageLayerImpl() {
  19 }
  20
  21 const char* PictureImageLayerImpl::LayerTypeAsString() const {
  22   return "cc::PictureImageLayerImpl";
  23 }
  24
  25 scoped_ptr<LayerImpl> PictureImageLayerImpl::CreateLayerImpl(
  26     LayerTreeImpl* tree_impl) {
  27   return PictureImageLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
  28 }
  29
  30 void PictureImageLayerImpl::CalculateContentsScale(
  31     float ideal_contents_scale,
  32     float device_scale_factor,
  33     float page_scale_factor,
  34     float maximum_animation_contents_scale,
  35     bool animating_transform_to_screen,
  36     float* contents_scale_x,
  37     float* contents_scale_y,
  38     gfx::Size* content_bounds) {
  39   // CalculateRasterContentsScale always returns 1.f, so make that the ideal
  40   // scale.
  41   ideal_contents_scale = 1.f;
  42   PictureLayerImpl::CalculateContentsScale(ideal_contents_scale,
  43                                            device_scale_factor,
  44                                            page_scale_factor,
  45                                            maximum_animation_contents_scale,
  46                                            animating_transform_to_screen,
  47                                            contents_scale_x,
  48                                            contents_scale_y,
  49                                            content_bounds);
  50 }
  51
  52 void PictureImageLayerImpl::GetDebugBorderProperties(
  53     SkColor* color, float* width) const {
  54   *color = DebugColors::ImageLayerBorderColor();
  55   *width = DebugColors::ImageLayerBorderWidth(layer_tree_impl());
  56 }
  57
  58 bool PictureImageLayerImpl::ShouldAdjustRasterScale(
  59     bool animating_transform_to_screen) const {
  60   return false;
  61 }
  62
  63 void PictureImageLayerImpl::RecalculateRasterScales(
  64     bool animating_transform_to_screen,
  65     float maximum_animation_contents_scale) {
  66   // Defaults from PictureLayerImpl.
  67   PictureLayerImpl::RecalculateRasterScales(animating_transform_to_screen,
  68                                             maximum_animation_contents_scale);
  69
  70   // Don't scale images during rastering to ensure image quality, save memory
  71   // and avoid frequent re-rastering on change of scale.
  72   raster_contents_scale_ = std::max(1.f, MinimumContentsScale());
  73   // We don't need low res tiles.
  74   low_res_raster_contents_scale_ = raster_contents_scale_;
  75 }
  76
  77 }  // namespace cc