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 SatisfyCallback& satisfy_callback,
  31       const RequireCallback& require_callback);
  32
  33   void SetSurfaceId(SurfaceId surface_id, float scale, const gfx::Size& size);
  34
  35   // Layer overrides.
  36   scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
  37   void SetLayerTreeHost(LayerTreeHost* host) override;
  38   void PushPropertiesTo(LayerImpl* layer) override;
  39   void CalculateContentsScale(float ideal_contents_scale,
  40                               float* contents_scale_x,
  41                               float* contents_scale_y,
  42                               gfx::Size* content_bounds) override;
  43
  44  protected:
  45   SurfaceLayer(const SatisfyCallback& satisfy_callback,
  46                const RequireCallback& require_callback);
  47   bool HasDrawableContent() const override;
  48
  49  private:
  50   ~SurfaceLayer() override;
  51   void CreateNewDestroySequence();
  52   void SatisfyDestroySequence();
  53
  54   SurfaceId surface_id_;
  55   gfx::Size surface_size_;
  56   float surface_scale_;
  57   SurfaceSequence destroy_sequence_;
  58   SatisfyCallback satisfy_callback_;
  59   RequireCallback require_callback_;
  60
  61   DISALLOW_COPY_AND_ASSIGN(SurfaceLayer);
  62 };
  63
  64 }  // namespace cc
  65
  66 #endif  // CC_LAYERS_SURFACE_LAYER_H_