io_surface_layer_impl.cc revision eb525c5499e34cc9c4b825d6d9e75bb07cc06ace 
1// Copyright 2012 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/io_surface_layer_impl.h"
6
7#include "base/strings/stringprintf.h"
8#include "cc/layers/quad_sink.h"
9#include "cc/output/gl_renderer.h"  // For the GLC() macro.
10#include "cc/output/output_surface.h"
11#include "cc/quads/io_surface_draw_quad.h"
12#include "cc/trees/layer_tree_impl.h"
13#include "gpu/GLES2/gl2extchromium.h"
14#include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
15#include "third_party/khronos/GLES2/gl2.h"
16#include "third_party/khronos/GLES2/gl2ext.h"
17
18namespace cc {
19
20IOSurfaceLayerImpl::IOSurfaceLayerImpl(LayerTreeImpl* tree_impl, int id)
21    : LayerImpl(tree_impl, id),
22      io_surface_id_(0),
23      io_surface_changed_(false),
24      io_surface_texture_id_(0) {}
25
26IOSurfaceLayerImpl::~IOSurfaceLayerImpl() {
27  if (!io_surface_texture_id_)
28    return;
29
30  DestroyTexture();
31}
32
33void IOSurfaceLayerImpl::DestroyTexture() {
34  if (io_surface_resource_id_) {
35    ResourceProvider* resource_provider =
36        layer_tree_impl()->resource_provider();
37    resource_provider->DeleteResource(io_surface_resource_id_);
38    io_surface_resource_id_ = 0;
39  }
40
41  if (io_surface_texture_id_) {
42    OutputSurface* output_surface = layer_tree_impl()->output_surface();
43    // TODO(skaslev): Implement this path for software compositing.
44    WebKit::WebGraphicsContext3D* context3d = output_surface->context3d();
45    if (context3d)
46      context3d->deleteTexture(io_surface_texture_id_);
47    io_surface_texture_id_ = 0;
48  }
49}
50
51scoped_ptr<LayerImpl> IOSurfaceLayerImpl::CreateLayerImpl(
52    LayerTreeImpl* tree_impl) {
53  return IOSurfaceLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
54}
55
56void IOSurfaceLayerImpl::PushPropertiesTo(LayerImpl* layer) {
57  LayerImpl::PushPropertiesTo(layer);
58
59  IOSurfaceLayerImpl* io_surface_layer =
60      static_cast<IOSurfaceLayerImpl*>(layer);
61  io_surface_layer->SetIOSurfaceProperties(io_surface_id_, io_surface_size_);
62}
63
64bool IOSurfaceLayerImpl::WillDraw(DrawMode draw_mode,
65                                  ResourceProvider* resource_provider) {
66  if (draw_mode == DRAW_MODE_RESOURCELESS_SOFTWARE)
67    return false;
68
69  if (io_surface_changed_) {
70    WebKit::WebGraphicsContext3D* context3d =
71        resource_provider->GraphicsContext3D();
72    if (!context3d) {
73      // TODO(skaslev): Implement this path for software compositing.
74      return false;
75    }
76
77    // TODO(ernstm): Do this in a way that we can track memory usage.
78    if (!io_surface_texture_id_) {
79      io_surface_texture_id_ = context3d->createTexture();
80      io_surface_resource_id_ =
81          resource_provider->CreateResourceFromExternalTexture(
82              GL_TEXTURE_RECTANGLE_ARB,
83              io_surface_texture_id_);
84    }
85
86    GLC(context3d,
87        context3d->bindTexture(GL_TEXTURE_RECTANGLE_ARB,
88                               io_surface_texture_id_));
89    context3d->texImageIOSurface2DCHROMIUM(GL_TEXTURE_RECTANGLE_ARB,
90                                           io_surface_size_.width(),
91                                           io_surface_size_.height(),
92                                           io_surface_id_,
93                                           0);
94    // Do not check for error conditions. texImageIOSurface2DCHROMIUM() is
95    // supposed to hold on to the last good IOSurface if the new one is already
96    // closed. This is only a possibility during live resizing of plugins.
97    // However, it seems that this is not sufficient to completely guard against
98    // garbage being drawn. If this is found to be a significant issue, it may
99    // be necessary to explicitly tell the embedder when to free the surfaces it
100    // has allocated.
101    io_surface_changed_ = false;
102  }
103
104  return LayerImpl::WillDraw(draw_mode, resource_provider);
105}
106
107void IOSurfaceLayerImpl::AppendQuads(QuadSink* quad_sink,
108                                     AppendQuadsData* append_quads_data) {
109  SharedQuadState* shared_quad_state =
110      quad_sink->UseSharedQuadState(CreateSharedQuadState());
111  AppendDebugBorderQuad(quad_sink, shared_quad_state, append_quads_data);
112
113  gfx::Rect quad_rect(content_bounds());
114  gfx::Rect opaque_rect(contents_opaque() ? quad_rect : gfx::Rect());
115  scoped_ptr<IOSurfaceDrawQuad> quad = IOSurfaceDrawQuad::Create();
116  quad->SetNew(shared_quad_state,
117               quad_rect,
118               opaque_rect,
119               io_surface_size_,
120               io_surface_resource_id_,
121               IOSurfaceDrawQuad::FLIPPED);
122  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
123}
124
125void IOSurfaceLayerImpl::DidLoseOutputSurface() {
126  // We don't have a valid texture ID in the new context; however,
127  // the IOSurface is still valid.
128  DestroyTexture();
129  io_surface_changed_ = true;
130}
131
132void IOSurfaceLayerImpl::SetIOSurfaceProperties(unsigned io_surface_id,
133                                                gfx::Size size) {
134  if (io_surface_id_ != io_surface_id)
135    io_surface_changed_ = true;
136
137  io_surface_id_ = io_surface_id;
138  io_surface_size_ = size;
139}
140
141const char* IOSurfaceLayerImpl::LayerTypeAsString() const {
142  return "cc::IOSurfaceLayerImpl";
143}
144
145}  // namespace cc
146