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 #include "android_webview/browser/hardware_renderer.h"
6
7 #include "android_webview/browser/aw_gl_surface.h"
8 #include "android_webview/browser/deferred_gpu_command_service.h"
9 #include "android_webview/browser/parent_output_surface.h"
10 #include "android_webview/browser/shared_renderer_state.h"
11 #include "android_webview/public/browser/draw_gl.h"
12 #include "base/auto_reset.h"
13 #include "base/debug/trace_event.h"
14 #include "base/strings/string_number_conversions.h"
15 #include "cc/layers/delegated_frame_provider.h"
16 #include "cc/layers/delegated_renderer_layer.h"
17 #include "cc/layers/layer.h"
18 #include "cc/output/compositor_frame.h"
19 #include "cc/output/output_surface.h"
20 #include "cc/trees/layer_tree_host.h"
21 #include "cc/trees/layer_tree_settings.h"
22 #include "gpu/command_buffer/client/gl_in_process_context.h"
23 #include "ui/gfx/frame_time.h"
24 #include "ui/gfx/geometry/rect_conversions.h"
25 #include "ui/gfx/geometry/rect_f.h"
26 #include "ui/gfx/transform.h"
27 #include "ui/gl/gl_bindings.h"
28 #include "webkit/common/gpu/context_provider_in_process.h"
29 #include "webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
30
31 namespace android_webview {
32
33 namespace {
34
35 using webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl;
36
CreateContext(scoped_refptr<gfx::GLSurface> surface,scoped_refptr<gpu::InProcessCommandBuffer::Service> service,gpu::GLInProcessContext * share_context)37 scoped_refptr<cc::ContextProvider> CreateContext(
38 scoped_refptr<gfx::GLSurface> surface,
39 scoped_refptr<gpu::InProcessCommandBuffer::Service> service,
40 gpu::GLInProcessContext* share_context) {
41 const gfx::GpuPreference gpu_preference = gfx::PreferDiscreteGpu;
42
43 blink::WebGraphicsContext3D::Attributes attributes;
44 attributes.antialias = false;
45 attributes.depth = false;
46 attributes.stencil = false;
47 attributes.shareResources = true;
48 attributes.noAutomaticFlushes = true;
49 gpu::GLInProcessContextAttribs in_process_attribs;
50 WebGraphicsContext3DInProcessCommandBufferImpl::ConvertAttributes(
51 attributes, &in_process_attribs);
52 in_process_attribs.lose_context_when_out_of_memory = 1;
53
54 scoped_ptr<gpu::GLInProcessContext> context(
55 gpu::GLInProcessContext::Create(service,
56 surface,
57 surface->IsOffscreen(),
58 gfx::kNullAcceleratedWidget,
59 surface->GetSize(),
60 share_context,
61 false /* share_resources */,
62 in_process_attribs,
63 gpu_preference));
64 DCHECK(context.get());
65
66 return webkit::gpu::ContextProviderInProcess::Create(
67 WebGraphicsContext3DInProcessCommandBufferImpl::WrapContext(
68 context.Pass(), attributes),
69 "Parent-Compositor");
70 }
71
72 } // namespace
73
HardwareRenderer(SharedRendererState * state)74 HardwareRenderer::HardwareRenderer(SharedRendererState* state)
75 : shared_renderer_state_(state),
76 last_egl_context_(eglGetCurrentContext()),
77 stencil_enabled_(false),
78 viewport_clip_valid_for_dcheck_(false),
79 gl_surface_(new AwGLSurface),
80 root_layer_(cc::Layer::Create()),
81 resource_collection_(new cc::DelegatedFrameResourceCollection),
82 output_surface_(NULL) {
83 DCHECK(last_egl_context_);
84
85 resource_collection_->SetClient(this);
86
87 cc::LayerTreeSettings settings;
88
89 // Should be kept in sync with compositor_impl_android.cc.
90 settings.allow_antialiasing = false;
91 settings.highp_threshold_min = 2048;
92
93 // Webview does not own the surface so should not clear it.
94 settings.should_clear_root_render_pass = false;
95
96 layer_tree_host_ =
97 cc::LayerTreeHost::CreateSingleThreaded(this, this, NULL, settings);
98 layer_tree_host_->SetRootLayer(root_layer_);
99 layer_tree_host_->SetLayerTreeHostClientReady();
100 layer_tree_host_->set_has_transparent_background(true);
101 }
102
~HardwareRenderer()103 HardwareRenderer::~HardwareRenderer() {
104 // Must reset everything before |resource_collection_| to ensure all
105 // resources are returned before resetting |resource_collection_| client.
106 layer_tree_host_.reset();
107 root_layer_ = NULL;
108 delegated_layer_ = NULL;
109 frame_provider_ = NULL;
110 #if DCHECK_IS_ON
111 // Check collection is empty.
112 cc::ReturnedResourceArray returned_resources;
113 resource_collection_->TakeUnusedResourcesForChildCompositor(
114 &returned_resources);
115 DCHECK_EQ(0u, returned_resources.size());
116 #endif // DCHECK_IS_ON
117
118 resource_collection_->SetClient(NULL);
119
120 // Reset draw constraints.
121 shared_renderer_state_->UpdateDrawConstraints(
122 ParentCompositorDrawConstraints());
123 }
124
DidBeginMainFrame()125 void HardwareRenderer::DidBeginMainFrame() {
126 // This is called after OutputSurface is created, but before the impl frame
127 // starts. We set the draw constraints here.
128 DCHECK(output_surface_);
129 DCHECK(viewport_clip_valid_for_dcheck_);
130 output_surface_->SetExternalStencilTest(stencil_enabled_);
131 output_surface_->SetDrawConstraints(viewport_, clip_);
132 }
133
CommitFrame()134 void HardwareRenderer::CommitFrame() {
135 scoped_ptr<DrawGLInput> input = shared_renderer_state_->PassDrawGLInput();
136 // Happens with empty global visible rect.
137 if (!input.get())
138 return;
139
140 DCHECK(!input->frame.gl_frame_data);
141 DCHECK(!input->frame.software_frame_data);
142
143 // DelegatedRendererLayerImpl applies the inverse device_scale_factor of the
144 // renderer frame, assuming that the browser compositor will scale
145 // it back up to device scale. But on Android we put our browser layers in
146 // physical pixels and set our browser CC device_scale_factor to 1, so this
147 // suppresses the transform.
148 input->frame.delegated_frame_data->device_scale_factor = 1.0f;
149
150 gfx::Size frame_size =
151 input->frame.delegated_frame_data->render_pass_list.back()
152 ->output_rect.size();
153 bool size_changed = frame_size != frame_size_;
154 frame_size_ = frame_size;
155 scroll_offset_ = input->scroll_offset;
156
157 if (!frame_provider_ || size_changed) {
158 if (delegated_layer_) {
159 delegated_layer_->RemoveFromParent();
160 }
161
162 frame_provider_ = new cc::DelegatedFrameProvider(
163 resource_collection_.get(), input->frame.delegated_frame_data.Pass());
164
165 delegated_layer_ = cc::DelegatedRendererLayer::Create(frame_provider_);
166 delegated_layer_->SetBounds(gfx::Size(input->width, input->height));
167 delegated_layer_->SetIsDrawable(true);
168
169 root_layer_->AddChild(delegated_layer_);
170 } else {
171 frame_provider_->SetFrameData(input->frame.delegated_frame_data.Pass());
172 }
173 }
174
DrawGL(bool stencil_enabled,int framebuffer_binding_ext,AwDrawGLInfo * draw_info)175 void HardwareRenderer::DrawGL(bool stencil_enabled,
176 int framebuffer_binding_ext,
177 AwDrawGLInfo* draw_info) {
178 TRACE_EVENT0("android_webview", "HardwareRenderer::DrawGL");
179
180 // We need to watch if the current Android context has changed and enforce
181 // a clean-up in the compositor.
182 EGLContext current_context = eglGetCurrentContext();
183 if (!current_context) {
184 DLOG(ERROR) << "DrawGL called without EGLContext";
185 return;
186 }
187
188 // TODO(boliu): Handle context loss.
189 if (last_egl_context_ != current_context)
190 DLOG(WARNING) << "EGLContextChanged";
191
192 gfx::Transform transform(gfx::Transform::kSkipInitialization);
193 transform.matrix().setColMajorf(draw_info->transform);
194 transform.Translate(scroll_offset_.x(), scroll_offset_.y());
195
196 // Need to post the new transform matrix back to child compositor
197 // because there is no onDraw during a Render Thread animation, and child
198 // compositor might not have the tiles rasterized as the animation goes on.
199 ParentCompositorDrawConstraints draw_constraints(
200 draw_info->is_layer, transform, gfx::Rect(viewport_));
201
202 draw_constraints_ = draw_constraints;
203 shared_renderer_state_->PostExternalDrawConstraintsToChildCompositor(
204 draw_constraints);
205
206 if (!delegated_layer_.get())
207 return;
208
209 viewport_.SetSize(draw_info->width, draw_info->height);
210 layer_tree_host_->SetViewportSize(viewport_);
211 clip_.SetRect(draw_info->clip_left,
212 draw_info->clip_top,
213 draw_info->clip_right - draw_info->clip_left,
214 draw_info->clip_bottom - draw_info->clip_top);
215 stencil_enabled_ = stencil_enabled;
216
217 delegated_layer_->SetTransform(transform);
218
219 gl_surface_->SetBackingFrameBufferObject(framebuffer_binding_ext);
220 {
221 base::AutoReset<bool> frame_resetter(&viewport_clip_valid_for_dcheck_,
222 true);
223 layer_tree_host_->SetNeedsRedrawRect(clip_);
224 layer_tree_host_->Composite(gfx::FrameTime::Now());
225 }
226 gl_surface_->ResetBackingFrameBufferObject();
227 }
228
CreateOutputSurface(bool fallback)229 scoped_ptr<cc::OutputSurface> HardwareRenderer::CreateOutputSurface(
230 bool fallback) {
231 // Android webview does not support losing output surface.
232 DCHECK(!fallback);
233 scoped_refptr<cc::ContextProvider> context_provider =
234 CreateContext(gl_surface_,
235 DeferredGpuCommandService::GetInstance(),
236 shared_renderer_state_->GetSharedContext());
237 scoped_ptr<ParentOutputSurface> output_surface_holder(
238 new ParentOutputSurface(context_provider));
239 output_surface_ = output_surface_holder.get();
240 return output_surface_holder.PassAs<cc::OutputSurface>();
241 }
242
UnusedResourcesAreAvailable()243 void HardwareRenderer::UnusedResourcesAreAvailable() {
244 cc::ReturnedResourceArray returned_resources;
245 resource_collection_->TakeUnusedResourcesForChildCompositor(
246 &returned_resources);
247 shared_renderer_state_->InsertReturnedResources(returned_resources);
248 }
249
250 } // namespace android_webview
251