root/cc/layers/picture_image_layer_impl.cc

DEFINITIONS

1. LayerTypeAsString
2. CreateLayerImpl
3. CalculateContentsScale
4. GetDebugBorderProperties
5. ShouldAdjustRasterScale
6. RecalculateRasterScales

// Copyright 2013 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/picture_image_layer_impl.h"

#include <algorithm>

#include "cc/debug/debug_colors.h"
#include "cc/trees/layer_tree_impl.h"

namespace cc {

PictureImageLayerImpl::PictureImageLayerImpl(LayerTreeImpl* tree_impl, int id)
    : PictureLayerImpl(tree_impl, id) {
}

PictureImageLayerImpl::~PictureImageLayerImpl() {
}

const char* PictureImageLayerImpl::LayerTypeAsString() const {
  return "cc::PictureImageLayerImpl";
}

scoped_ptr<LayerImpl> PictureImageLayerImpl::CreateLayerImpl(
    LayerTreeImpl* tree_impl) {
  return PictureImageLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
}

void PictureImageLayerImpl::CalculateContentsScale(
    float ideal_contents_scale,
    float device_scale_factor,
    float page_scale_factor,
    bool animating_transform_to_screen,
    float* contents_scale_x,
    float* contents_scale_y,
    gfx::Size* content_bounds) {
  // CalculateRasterContentsScale always returns 1.f, so make that the ideal
  // scale.
  ideal_contents_scale = 1.f;
  PictureLayerImpl::CalculateContentsScale(ideal_contents_scale,
                                           device_scale_factor,
                                           page_scale_factor,
                                           animating_transform_to_screen,
                                           contents_scale_x,
                                           contents_scale_y,
                                           content_bounds);
}

void PictureImageLayerImpl::GetDebugBorderProperties(
    SkColor* color, float* width) const {
  *color = DebugColors::ImageLayerBorderColor();
  *width = DebugColors::ImageLayerBorderWidth(layer_tree_impl());
}

bool PictureImageLayerImpl::ShouldAdjustRasterScale(
    bool animating_transform_to_screen) const {
  return false;
}

void PictureImageLayerImpl::RecalculateRasterScales(
    bool animating_transform_to_screen) {
  // Defaults from PictureLayerImpl.
  PictureLayerImpl::RecalculateRasterScales(animating_transform_to_screen);

  // Don't scale images during rastering to ensure image quality, save memory
  // and avoid frequent re-rastering on change of scale.
  raster_contents_scale_ = std::max(1.f, MinimumContentsScale());
  // We don't need low res tiles.
  low_res_raster_contents_scale_ = raster_contents_scale_;
}

}  // namespace cc