cc/layers/surface_layer.h

   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 #ifndef CC_LAYERS_SURFACE_LAYER_H_
   6 #define CC_LAYERS_SURFACE_LAYER_H_
   7
   8 #include "cc/base/cc_export.h"
   9 #include "cc/layers/layer.h"
  10 #include "cc/surfaces/surface_id.h"
  11 #include "cc/surfaces/surface_sequence.h"
  12 #include "ui/gfx/geometry/size.h"
  13
  14 namespace cc {
  15
  16 // A layer that renders a surface referencing the output of another compositor
  17 // instance or client.
  18 class CC_EXPORT SurfaceLayer : public Layer {
  19  public:
  20   // This callback is run when a SurfaceSequence needs to be satisfied, but
  21   // the parent compositor is unable to. It can be called on either the main
  22   // or impl threads.
  23   using SatisfyCallback = base::Callback<void(SurfaceSequence)>;
  24
  25   // This callback is run to require that a specific SurfaceSequence is
  26   // received before a SurfaceId is destroyed.
  27   using RequireCallback = base::Callback<void(SurfaceId, SurfaceSequence)>;
  28
  29   static scoped_refptr<SurfaceLayer> Create(
  30       const LayerSettings& settings,
  31       const SatisfyCallback& satisfy_callback,
  32       const RequireCallback& require_callback);
  33
  34   void SetSurfaceId(SurfaceId surface_id, float scale, const gfx::Size& size);
  35
  36   // Layer overrides.
  37   scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
  38   void SetLayerTreeHost(LayerTreeHost* host) override;
  39   void PushPropertiesTo(LayerImpl* layer) override;
  40   void CalculateContentsScale(float ideal_contents_scale,
  41                               float* contents_scale_x,
  42                               float* contents_scale_y,
  43                               gfx::Size* content_bounds) override;
  44
  45  protected:
  46   SurfaceLayer(const LayerSettings& settings,
  47                const SatisfyCallback& satisfy_callback,
  48                const RequireCallback& require_callback);
  49   bool HasDrawableContent() const override;
  50
  51  private:
  52   ~SurfaceLayer() override;
  53   void CreateNewDestroySequence();
  54   void SatisfyDestroySequence();
  55
  56   SurfaceId surface_id_;
  57   gfx::Size surface_size_;
  58   float surface_scale_;
  59   SurfaceSequence destroy_sequence_;
  60   SatisfyCallback satisfy_callback_;
  61   RequireCallback require_callback_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(SurfaceLayer);
  64 };
  65
  66 }  // namespace cc
  67
  68 #endif  // CC_LAYERS_SURFACE_LAYER_H_