cc/output/overlay_processor.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_OUTPUT_OVERLAY_PROCESSOR_H_
   6 #define CC_OUTPUT_OVERLAY_PROCESSOR_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "cc/base/cc_export.h"
  11 #include "cc/output/overlay_candidate.h"
  12 #include "cc/quads/render_pass.h"
  13
  14 namespace cc {
  15 class OutputSurface;
  16 class ResourceProvider;
  17
  18 class CC_EXPORT OverlayProcessor {
  19  public:
  20   class CC_EXPORT Strategy {
  21    public:
  22     virtual ~Strategy() {}
  23     // Returns false if the strategy cannot be made to work with the
  24     // current set of render passes. Returns true if the strategy was successful
  25     // and adds any additional passes necessary to represent overlays to
  26     // |render_passes_in_draw_order|.
  27     virtual bool Attempt(RenderPassList* render_passes_in_draw_order,
  28                          OverlayCandidateList* candidates,
  29                          float device_scale_factor) = 0;
  30   };
  31   typedef ScopedPtrVector<Strategy> StrategyList;
  32
  33   explicit OverlayProcessor(OutputSurface* surface);
  34   virtual ~OverlayProcessor();
  35   // Virtual to allow testing different strategies.
  36   virtual void Initialize();
  37
  38   void ProcessForOverlays(RenderPassList* render_passes_in_draw_order,
  39                           OverlayCandidateList* candidate_list);
  40
  41  protected:
  42   StrategyList strategies_;
  43   OutputSurface* surface_;
  44
  45  private:
  46   DISALLOW_COPY_AND_ASSIGN(OverlayProcessor);
  47 };
  48
  49 }  // namespace cc
  50
  51 #endif  // CC_OUTPUT_OVERLAY_PROCESSOR_H_