1// Copyright 2010 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/image_layer.h"
6
7#include "base/compiler_specific.h"
8#include "cc/resources/image_layer_updater.h"
9#include "cc/resources/layer_updater.h"
10#include "cc/resources/prioritized_resource.h"
11#include "cc/resources/resource_update_queue.h"
12#include "cc/trees/layer_tree_host.h"
13
14namespace cc {
15
16scoped_refptr<ImageLayer> ImageLayer::Create() {
17  return make_scoped_refptr(new ImageLayer());
18}
19
20ImageLayer::ImageLayer() : TiledLayer() {}
21
22ImageLayer::~ImageLayer() {}
23
24void ImageLayer::SetBitmap(const SkBitmap& bitmap) {
25  // SetBitmap() currently gets called whenever there is any
26  // style change that affects the layer even if that change doesn't
27  // affect the actual contents of the image (e.g. a CSS animation).
28  // With this check in place we avoid unecessary texture uploads.
29  if (bitmap.pixelRef() && bitmap.pixelRef() == bitmap_.pixelRef())
30    return;
31
32  bitmap_ = bitmap;
33  UpdateDrawsContent(HasDrawableContent());
34  SetNeedsDisplay();
35}
36
37bool ImageLayer::HasDrawableContent() const {
38  return !bitmap_.isNull() && TiledLayer::HasDrawableContent();
39}
40
41void ImageLayer::SetTexturePriorities(const PriorityCalculator& priority_calc) {
42  // Update the tile data before creating all the layer's tiles.
43  UpdateTileSizeAndTilingOption();
44
45  TiledLayer::SetTexturePriorities(priority_calc);
46}
47
48bool ImageLayer::Update(ResourceUpdateQueue* queue,
49                        const OcclusionTracker<Layer>* occlusion) {
50  CreateUpdaterIfNeeded();
51  if (!updater_->UsingBitmap(bitmap_)) {
52    updater_->SetBitmap(bitmap_);
53    UpdateTileSizeAndTilingOption();
54    InvalidateContentRect(gfx::Rect(content_bounds()));
55  }
56  return TiledLayer::Update(queue, occlusion);
57}
58
59void ImageLayer::CreateUpdaterIfNeeded() {
60  if (updater_.get())
61    return;
62
63  updater_ = ImageLayerUpdater::Create();
64  SetTextureFormat(
65      layer_tree_host()->GetRendererCapabilities().best_texture_format);
66}
67
68LayerUpdater* ImageLayer::Updater() const {
69  return updater_.get();
70}
71
72void ImageLayer::CalculateContentsScale(float ideal_contents_scale,
73                                        float* contents_scale_x,
74                                        float* contents_scale_y,
75                                        gfx::Size* content_bounds) {
76  *contents_scale_x = ImageContentsScaleX();
77  *contents_scale_y = ImageContentsScaleY();
78  *content_bounds = gfx::Size(bitmap_.width(), bitmap_.height());
79}
80
81void ImageLayer::OnOutputSurfaceCreated() {
82  SetTextureFormat(
83      layer_tree_host()->GetRendererCapabilities().best_texture_format);
84  TiledLayer::OnOutputSurfaceCreated();
85}
86
87float ImageLayer::ImageContentsScaleX() const {
88  if (bounds().IsEmpty() || bitmap_.width() == 0)
89    return 1;
90  return static_cast<float>(bitmap_.width()) / bounds().width();
91}
92
93float ImageLayer::ImageContentsScaleY() const {
94  if (bounds().IsEmpty() || bitmap_.height() == 0)
95    return 1;
96  return static_cast<float>(bitmap_.height()) / bounds().height();
97}
98
99}  // namespace cc
100