android_webview/browser/hardware_renderer.cc

   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/child_frame.h"
   9 #include "android_webview/browser/deferred_gpu_command_service.h"
  10 #include "android_webview/browser/parent_compositor_draw_constraints.h"
  11 #include "android_webview/browser/parent_output_surface.h"
  12 #include "android_webview/browser/shared_renderer_state.h"
  13 #include "android_webview/public/browser/draw_gl.h"
  14 #include "base/auto_reset.h"
  15 #include "base/strings/string_number_conversions.h"
  16 #include "base/trace_event/trace_event.h"
  17 #include "cc/layers/delegated_frame_provider.h"
  18 #include "cc/layers/delegated_renderer_layer.h"
  19 #include "cc/layers/layer.h"
  20 #include "cc/output/compositor_frame.h"
  21 #include "cc/output/output_surface.h"
  22 #include "cc/scheduler/begin_frame_source.h"
  23 #include "cc/trees/layer_tree_host.h"
  24 #include "cc/trees/layer_tree_settings.h"
  25 #include "gpu/blink/webgraphicscontext3d_in_process_command_buffer_impl.h"
  26 #include "gpu/command_buffer/client/gl_in_process_context.h"
  27 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
  28 #include "ui/gfx/frame_time.h"
  29 #include "ui/gfx/geometry/rect_conversions.h"
  30 #include "ui/gfx/geometry/rect_f.h"
  31 #include "ui/gfx/transform.h"
  32 #include "ui/gl/gl_bindings.h"
  33 #include "webkit/common/gpu/context_provider_in_process.h"
  34
  35 namespace android_webview {
  36
  37 namespace {
  38
  39 using gpu_blink::WebGraphicsContext3DImpl;
  40 using gpu_blink::WebGraphicsContext3DInProcessCommandBufferImpl;
  41
  42 scoped_refptr<cc::ContextProvider> CreateContext(
  43     scoped_refptr<gfx::GLSurface> surface,
  44     scoped_refptr<gpu::InProcessCommandBuffer::Service> service) {
  45   const gfx::GpuPreference gpu_preference = gfx::PreferDiscreteGpu;
  46
  47   blink::WebGraphicsContext3D::Attributes attributes;
  48   attributes.antialias = false;
  49   attributes.depth = false;
  50   attributes.stencil = false;
  51   attributes.shareResources = true;
  52   attributes.noAutomaticFlushes = true;
  53   gpu::gles2::ContextCreationAttribHelper attribs_for_gles2;
  54   WebGraphicsContext3DImpl::ConvertAttributes(
  55       attributes, &attribs_for_gles2);
  56   attribs_for_gles2.lose_context_when_out_of_memory = true;
  57
  58   scoped_ptr<gpu::GLInProcessContext> context(gpu::GLInProcessContext::Create(
  59       service,
  60       surface,
  61       surface->IsOffscreen(),
  62       gfx::kNullAcceleratedWidget,
  63       surface->GetSize(),
  64       NULL /* share_context */,
  65       false /* share_resources */,
  66       attribs_for_gles2,
  67       gpu_preference,
  68       gpu::GLInProcessContextSharedMemoryLimits(),
  69       nullptr,
  70       nullptr));
  71   DCHECK(context.get());
  72
  73   return webkit::gpu::ContextProviderInProcess::Create(
  74       WebGraphicsContext3DInProcessCommandBufferImpl::WrapContext(
  75           context.Pass(), attributes),
  76       "Parent-Compositor");
  77 }
  78
  79 }  // namespace
  80
  81 HardwareRenderer::HardwareRenderer(SharedRendererState* state)
  82     : shared_renderer_state_(state),
  83       last_egl_context_(eglGetCurrentContext()),
  84       stencil_enabled_(false),
  85       viewport_clip_valid_for_dcheck_(false),
  86       gl_surface_(new AwGLSurface),
  87       root_layer_(cc::Layer::Create()),
  88       resource_collection_(new cc::DelegatedFrameResourceCollection),
  89       output_surface_(NULL) {
  90   DCHECK(last_egl_context_);
  91
  92   resource_collection_->SetClient(this);
  93
  94   cc::LayerTreeSettings settings;
  95
  96   // Should be kept in sync with compositor_impl_android.cc.
  97   settings.renderer_settings.allow_antialiasing = false;
  98   settings.renderer_settings.highp_threshold_min = 2048;
  99
 100   // Webview does not own the surface so should not clear it.
 101   settings.renderer_settings.should_clear_root_render_pass = false;
 102
 103   // TODO(enne): Update this this compositor to use a synchronous scheduler.
 104   settings.single_thread_proxy_scheduler = false;
 105
 106   layer_tree_host_ = cc::LayerTreeHost::CreateSingleThreaded(
 107       this, this, nullptr, nullptr, nullptr, settings, nullptr, nullptr);
 108   layer_tree_host_->SetRootLayer(root_layer_);
 109   layer_tree_host_->SetLayerTreeHostClientReady();
 110   layer_tree_host_->set_has_transparent_background(true);
 111 }
 112
 113 HardwareRenderer::~HardwareRenderer() {
 114   // Must reset everything before |resource_collection_| to ensure all
 115   // resources are returned before resetting |resource_collection_| client.
 116   layer_tree_host_.reset();
 117   root_layer_ = NULL;
 118   delegated_layer_ = NULL;
 119   frame_provider_ = NULL;
 120 #if DCHECK_IS_ON()
 121   // Check collection is empty.
 122   cc::ReturnedResourceArray returned_resources;
 123   resource_collection_->TakeUnusedResourcesForChildCompositor(
 124       &returned_resources);
 125   DCHECK_EQ(0u, returned_resources.size());
 126 #endif  // DCHECK_IS_ON()
 127
 128   resource_collection_->SetClient(NULL);
 129
 130   // Reset draw constraints.
 131   shared_renderer_state_->PostExternalDrawConstraintsToChildCompositorOnRT(
 132       ParentCompositorDrawConstraints());
 133 }
 134
 135 void HardwareRenderer::DidBeginMainFrame() {
 136   // This is called after OutputSurface is created, but before the impl frame
 137   // starts. We set the draw constraints here.
 138   DCHECK(output_surface_);
 139   DCHECK(viewport_clip_valid_for_dcheck_);
 140   output_surface_->SetExternalStencilTest(stencil_enabled_);
 141   output_surface_->SetDrawConstraints(viewport_, clip_);
 142 }
 143
 144 void HardwareRenderer::CommitFrame() {
 145   TRACE_EVENT0("android_webview", "CommitFrame");
 146   scroll_offset_ = shared_renderer_state_->GetScrollOffsetOnRT();
 147   {
 148     scoped_ptr<ChildFrame> child_frame =
 149         shared_renderer_state_->PassCompositorFrameOnRT();
 150     if (!child_frame.get())
 151       return;
 152     child_frame_ = child_frame.Pass();
 153   }
 154
 155   scoped_ptr<cc::CompositorFrame> frame = child_frame_->frame.Pass();
 156   DCHECK(frame.get());
 157   DCHECK(!frame->gl_frame_data);
 158   DCHECK(!frame->software_frame_data);
 159
 160   // DelegatedRendererLayerImpl applies the inverse device_scale_factor of the
 161   // renderer frame, assuming that the browser compositor will scale
 162   // it back up to device scale.  But on Android we put our browser layers in
 163   // physical pixels and set our browser CC device_scale_factor to 1, so this
 164   // suppresses the transform.
 165   frame->delegated_frame_data->device_scale_factor = 1.0f;
 166
 167   gfx::Size frame_size =
 168       frame->delegated_frame_data->render_pass_list.back()->output_rect.size();
 169   bool size_changed = frame_size != frame_size_;
 170   frame_size_ = frame_size;
 171
 172   if (!frame_provider_.get() || size_changed) {
 173     if (delegated_layer_.get()) {
 174       delegated_layer_->RemoveFromParent();
 175     }
 176
 177     frame_provider_ = new cc::DelegatedFrameProvider(
 178         resource_collection_.get(), frame->delegated_frame_data.Pass());
 179
 180     delegated_layer_ = cc::DelegatedRendererLayer::Create(frame_provider_);
 181     delegated_layer_->SetBounds(frame_size_);
 182     delegated_layer_->SetIsDrawable(true);
 183
 184     root_layer_->AddChild(delegated_layer_);
 185   } else {
 186     frame_provider_->SetFrameData(frame->delegated_frame_data.Pass());
 187   }
 188 }
 189
 190 void HardwareRenderer::DrawGL(bool stencil_enabled,
 191                               int framebuffer_binding_ext,
 192                               AwDrawGLInfo* draw_info) {
 193   TRACE_EVENT0("android_webview", "HardwareRenderer::DrawGL");
 194
 195   // We need to watch if the current Android context has changed and enforce
 196   // a clean-up in the compositor.
 197   EGLContext current_context = eglGetCurrentContext();
 198   DCHECK(current_context) << "DrawGL called without EGLContext";
 199
 200   // TODO(boliu): Handle context loss.
 201   if (last_egl_context_ != current_context)
 202     DLOG(WARNING) << "EGLContextChanged";
 203
 204   gfx::Transform transform(gfx::Transform::kSkipInitialization);
 205   transform.matrix().setColMajorf(draw_info->transform);
 206   transform.Translate(scroll_offset_.x(), scroll_offset_.y());
 207
 208   viewport_.SetSize(draw_info->width, draw_info->height);
 209   // Need to post the new transform matrix back to child compositor
 210   // because there is no onDraw during a Render Thread animation, and child
 211   // compositor might not have the tiles rasterized as the animation goes on.
 212   ParentCompositorDrawConstraints draw_constraints(
 213       draw_info->is_layer, transform, gfx::Rect(viewport_));
 214   if (!child_frame_.get() || draw_constraints.NeedUpdate(*child_frame_)) {
 215     shared_renderer_state_->PostExternalDrawConstraintsToChildCompositorOnRT(
 216         draw_constraints);
 217   }
 218
 219   if (!delegated_layer_.get())
 220     return;
 221
 222   layer_tree_host_->SetViewportSize(viewport_);
 223   clip_.SetRect(draw_info->clip_left,
 224                 draw_info->clip_top,
 225                 draw_info->clip_right - draw_info->clip_left,
 226                 draw_info->clip_bottom - draw_info->clip_top);
 227   stencil_enabled_ = stencil_enabled;
 228
 229   delegated_layer_->SetTransform(transform);
 230
 231   gl_surface_->SetBackingFrameBufferObject(framebuffer_binding_ext);
 232   {
 233     base::AutoReset<bool> frame_resetter(&viewport_clip_valid_for_dcheck_,
 234                                          true);
 235     layer_tree_host_->SetNeedsRedrawRect(clip_);
 236     layer_tree_host_->Composite(gfx::FrameTime::Now());
 237   }
 238   gl_surface_->ResetBackingFrameBufferObject();
 239 }
 240
 241 void HardwareRenderer::RequestNewOutputSurface() {
 242   scoped_refptr<cc::ContextProvider> context_provider =
 243       CreateContext(gl_surface_,
 244                     DeferredGpuCommandService::GetInstance());
 245   scoped_ptr<ParentOutputSurface> output_surface_holder(
 246       new ParentOutputSurface(context_provider));
 247   output_surface_ = output_surface_holder.get();
 248   layer_tree_host_->SetOutputSurface(output_surface_holder.Pass());
 249 }
 250
 251 void HardwareRenderer::DidFailToInitializeOutputSurface() {
 252   RequestNewOutputSurface();
 253 }
 254
 255 void HardwareRenderer::UnusedResourcesAreAvailable() {
 256   cc::ReturnedResourceArray returned_resources;
 257   resource_collection_->TakeUnusedResourcesForChildCompositor(
 258       &returned_resources);
 259   shared_renderer_state_->InsertReturnedResourcesOnRT(returned_resources);
 260 }
 261
 262 }  // namespace android_webview