src/cc/layers/surface_layer.cc

   1 // Copyright 2014 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/surface_layer.h"
   6
   7 #include "cc/base/swap_promise.h"
   8 #include "cc/layers/surface_layer_impl.h"
   9 #include "cc/trees/layer_tree_host.h"
  10
  11 namespace cc {
  12
  13 class SatisfySwapPromise : public SwapPromise {
  14  public:
  15   SatisfySwapPromise(SurfaceSequence sequence,
  16                      const SurfaceLayer::SatisfyCallback& satisfy_callback)
  17       : sequence_(sequence), satisfy_callback_(satisfy_callback) {}
  18
  19   ~SatisfySwapPromise() override {}
  20
  21  private:
  22   void DidSwap(CompositorFrameMetadata* metadata) override {
  23     metadata->satisfies_sequences.push_back(sequence_.sequence);
  24   }
  25
  26   void DidNotSwap(DidNotSwapReason reason) override {
  27     satisfy_callback_.Run(sequence_);
  28   }
  29   int64 TraceId() const override { return 0; }
  30
  31   SurfaceSequence sequence_;
  32   SurfaceLayer::SatisfyCallback satisfy_callback_;
  33
  34   DISALLOW_COPY_AND_ASSIGN(SatisfySwapPromise);
  35 };
  36
  37 scoped_refptr<SurfaceLayer> SurfaceLayer::Create(
  38     const SatisfyCallback& satisfy_callback,
  39     const RequireCallback& require_callback) {
  40   return make_scoped_refptr(
  41       new SurfaceLayer(satisfy_callback, require_callback));
  42 }
  43
  44 SurfaceLayer::SurfaceLayer(const SatisfyCallback& satisfy_callback,
  45                            const RequireCallback& require_callback)
  46     : Layer(),
  47       satisfy_callback_(satisfy_callback),
  48       require_callback_(require_callback) {
  49 }
  50
  51 SurfaceLayer::~SurfaceLayer() {
  52   DCHECK(!layer_tree_host());
  53   DCHECK(destroy_sequence_.is_null());
  54 }
  55
  56 void SurfaceLayer::SetSurfaceId(SurfaceId surface_id, const gfx::Size& size) {
  57   SatisfyDestroySequence();
  58   surface_id_ = surface_id;
  59   surface_size_ = size;
  60   CreateNewDestroySequence();
  61
  62   UpdateDrawsContent(HasDrawableContent());
  63   SetNeedsPushProperties();
  64 }
  65
  66 scoped_ptr<LayerImpl> SurfaceLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
  67   return SurfaceLayerImpl::Create(tree_impl, id());
  68 }
  69
  70 bool SurfaceLayer::HasDrawableContent() const {
  71   return !surface_id_.is_null() && Layer::HasDrawableContent();
  72 }
  73
  74 void SurfaceLayer::SetLayerTreeHost(LayerTreeHost* host) {
  75   if (layer_tree_host() == host) {
  76     Layer::SetLayerTreeHost(host);
  77     return;
  78   }
  79
  80   SatisfyDestroySequence();
  81   Layer::SetLayerTreeHost(host);
  82   CreateNewDestroySequence();
  83 }
  84
  85 void SurfaceLayer::PushPropertiesTo(LayerImpl* layer) {
  86   Layer::PushPropertiesTo(layer);
  87   SurfaceLayerImpl* layer_impl = static_cast<SurfaceLayerImpl*>(layer);
  88
  89   layer_impl->SetSurfaceId(surface_id_);
  90 }
  91
  92 void SurfaceLayer::CalculateContentsScale(float ideal_contents_scale,
  93                                           float* contents_scale_x,
  94                                           float* contents_scale_y,
  95                                           gfx::Size* content_bounds) {
  96   *content_bounds = surface_size_;
  97   *contents_scale_x =
  98       bounds().IsEmpty() ? 1.f : static_cast<float>(content_bounds->width()) /
  99                                      bounds().width();
 100   *contents_scale_y =
 101       bounds().IsEmpty() ? 1.f : static_cast<float>(content_bounds->height()) /
 102                                      bounds().height();
 103 }
 104
 105 void SurfaceLayer::CreateNewDestroySequence() {
 106   DCHECK(destroy_sequence_.is_null());
 107   if (layer_tree_host()) {
 108     destroy_sequence_ = layer_tree_host()->CreateSurfaceSequence();
 109     require_callback_.Run(surface_id_, destroy_sequence_);
 110   }
 111 }
 112
 113 void SurfaceLayer::SatisfyDestroySequence() {
 114   if (!layer_tree_host())
 115     return;
 116   DCHECK(!destroy_sequence_.is_null());
 117   scoped_ptr<SatisfySwapPromise> satisfy(
 118       new SatisfySwapPromise(destroy_sequence_, satisfy_callback_));
 119   layer_tree_host()->QueueSwapPromise(satisfy.Pass());
 120   destroy_sequence_ = SurfaceSequence();
 121 }
 122
 123 }  // namespace cc