cc/layers/image_layer.cc

   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
  14 namespace cc {
  15
  16 scoped_refptr<ImageLayer> ImageLayer::Create() {
  17   return make_scoped_refptr(new ImageLayer());
  18 }
  19
  20 ImageLayer::ImageLayer() : TiledLayer() {}
  21
  22 ImageLayer::~ImageLayer() {}
  23
  24 void 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
  37 bool ImageLayer::HasDrawableContent() const {
  38   return !bitmap_.isNull() && TiledLayer::HasDrawableContent();
  39 }
  40
  41 void 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
  48 bool 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
  59 void 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
  68 LayerUpdater* ImageLayer::Updater() const {
  69   return updater_.get();
  70 }
  71
  72 void 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
  81 void ImageLayer::OnOutputSurfaceCreated() {
  82   SetTextureFormat(
  83       layer_tree_host()->GetRendererCapabilities().best_texture_format);
  84   TiledLayer::OnOutputSurfaceCreated();
  85 }
  86
  87 float ImageLayer::ImageContentsScaleX() const {
  88   if (bounds().IsEmpty() || bitmap_.width() == 0)
  89     return 1;
  90   return static_cast<float>(bitmap_.width()) / bounds().width();
  91 }
  92
  93 float 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