src/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     bool animating_transform_to_screen,
  35     float* contents_scale_x,
  36     float* contents_scale_y,
  37     gfx::Size* content_bounds) {
  38   // CalculateRasterContentsScale always returns 1.f, so make that the ideal
  39   // scale.
  40   ideal_contents_scale = 1.f;
  41   PictureLayerImpl::CalculateContentsScale(ideal_contents_scale,
  42                                            device_scale_factor,
  43                                            page_scale_factor,
  44                                            animating_transform_to_screen,
  45                                            contents_scale_x,
  46                                            contents_scale_y,
  47                                            content_bounds);
  48 }
  49
  50 void PictureImageLayerImpl::GetDebugBorderProperties(
  51     SkColor* color, float* width) const {
  52   *color = DebugColors::ImageLayerBorderColor();
  53   *width = DebugColors::ImageLayerBorderWidth(layer_tree_impl());
  54 }
  55
  56 bool PictureImageLayerImpl::ShouldAdjustRasterScale(
  57     bool animating_transform_to_screen) const {
  58   return false;
  59 }
  60
  61 void PictureImageLayerImpl::RecalculateRasterScales(
  62     bool animating_transform_to_screen) {
  63   // Defaults from PictureLayerImpl.
  64   PictureLayerImpl::RecalculateRasterScales(animating_transform_to_screen);
  65
  66   // Don't scale images during rastering to ensure image quality, save memory
  67   // and avoid frequent re-rastering on change of scale.
  68   raster_contents_scale_ = std::max(1.f, MinimumContentsScale());
  69   // We don't need low res tiles.
  70   low_res_raster_contents_scale_ = raster_contents_scale_;
  71 }
  72
  73 }  // namespace cc