synchronous_compositor.h revision f8ee788a64d60abd8f2d742a5fdedde054ecd910 
1// Copyright 2013 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 CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_
6#define CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_
7
8#include "base/memory/ref_counted.h"
9#include "content/common/content_export.h"
10#include "gpu/command_buffer/service/in_process_command_buffer.h"
11#include "ui/gfx/rect.h"
12#include "ui/gfx/size.h"
13
14class SkCanvas;
15
16namespace cc {
17class CompositorFrame;
18class CompositorFrameAck;
19}
20
21namespace gfx {
22class Transform;
23};
24
25namespace gpu {
26class GLInProcessContext;
27}
28
29namespace content {
30
31class SynchronousCompositorClient;
32class WebContents;
33
34struct CONTENT_EXPORT SynchronousCompositorMemoryPolicy {
35  // Memory limit for rendering and pre-rendering.
36  size_t bytes_limit;
37
38  // Limit of number of GL resources used for rendering and pre-rendering.
39  size_t num_resources_limit;
40
41  SynchronousCompositorMemoryPolicy();
42
43  bool operator==(const SynchronousCompositorMemoryPolicy& other) const;
44  bool operator!=(const SynchronousCompositorMemoryPolicy& other) const;
45};
46
47// Interface for embedders that wish to direct compositing operations
48// synchronously under their own control. Only meaningful when the
49// kEnableSyncrhonousRendererCompositor flag is specified.
50class CONTENT_EXPORT SynchronousCompositor {
51 public:
52  // Must be called once per WebContents instance. Will create the compositor
53  // instance as needed, but only if |client| is non-NULL.
54  static void SetClientForWebContents(WebContents* contents,
55                                      SynchronousCompositorClient* client);
56
57  // Allows changing or resetting the client to NULL (this must be used if
58  // the client is being deleted prior to the DidDestroyCompositor() call
59  // being received by the client). Ownership of |client| remains with
60  // the caller.
61  virtual void SetClient(SynchronousCompositorClient* client) = 0;
62
63  static void SetGpuService(
64      scoped_refptr<gpu::InProcessCommandBuffer::Service> service);
65
66  // Synchronously initialize compositor for hardware draw. Can only be called
67  // while compositor is in software only mode, either after compositor is
68  // first created or after ReleaseHwDraw is called. It is invalid to
69  // DemandDrawHw before this returns true.
70  virtual bool InitializeHwDraw() = 0;
71
72  // Reverse of InitializeHwDraw above. Can only be called while hardware draw
73  // is already initialized. Brings compositor back to software only mode and
74  // releases all hardware resources.
75  virtual void ReleaseHwDraw() = 0;
76
77  // Get the share context of the compositor. The returned context is owned
78  // by the compositor and is only valid between InitializeHwDraw and
79  // ReleaseHwDraw.
80  virtual gpu::GLInProcessContext* GetShareContext() = 0;
81
82  // "On demand" hardware draw. The content is first clipped to |damage_area|,
83  // then transformed through |transform|, and finally clipped to |view_size|.
84  virtual scoped_ptr<cc::CompositorFrame> DemandDrawHw(
85      gfx::Size surface_size,
86      const gfx::Transform& transform,
87      gfx::Rect viewport,
88      gfx::Rect clip) = 0;
89
90  // For delegated rendering, return resources from parent compositor to this.
91  // Note that all resources must be returned before ReleaseHwDraw.
92  virtual void ReturnResources(const cc::CompositorFrameAck& frame_ack) = 0;
93
94  // "On demand" SW draw, into the supplied canvas (observing the transform
95  // and clip set there-in).
96  virtual bool DemandDrawSw(SkCanvas* canvas) = 0;
97
98  // Set the memory limit policy of this compositor.
99  virtual void SetMemoryPolicy(
100      const SynchronousCompositorMemoryPolicy& policy) = 0;
101
102  // Should be called by the embedder after the embedder had modified the
103  // scroll offset of the root layer (as returned by
104  // SynchronousCompositorClient::GetTotalRootLayerScrollOffset).
105  virtual void DidChangeRootLayerScrollOffset() = 0;
106
107 protected:
108  virtual ~SynchronousCompositor() {}
109};
110
111}  // namespace content
112
113#endif  // CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_
114