src/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/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 "gpu/command_buffer/common/gles2_cmd_utils.h"
  24 #include "ui/gfx/frame_time.h"
  25 #include "ui/gfx/geometry/rect_conversions.h"
  26 #include "ui/gfx/geometry/rect_f.h"
  27 #include "ui/gfx/transform.h"
  28 #include "ui/gl/gl_bindings.h"
  29 #include "webkit/common/gpu/context_provider_in_process.h"
  30 #include "webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
  31
  32 namespace android_webview {
  33
  34 namespace {
  35
  36 using webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl;
  37 using webkit::gpu::WebGraphicsContext3DImpl;
  38
  39 scoped_refptr<cc::ContextProvider> CreateContext(
  40     scoped_refptr<gfx::GLSurface> surface,
  41     scoped_refptr<gpu::InProcessCommandBuffer::Service> service) {
  42   const gfx::GpuPreference gpu_preference = gfx::PreferDiscreteGpu;
  43
  44   blink::WebGraphicsContext3D::Attributes attributes;
  45   attributes.antialias = false;
  46   attributes.depth = false;
  47   attributes.stencil = false;
  48   attributes.shareResources = true;
  49   attributes.noAutomaticFlushes = true;
  50   gpu::gles2::ContextCreationAttribHelper attribs_for_gles2;
  51   WebGraphicsContext3DImpl::ConvertAttributes(
  52       attributes, &attribs_for_gles2);
  53   attribs_for_gles2.lose_context_when_out_of_memory = true;
  54
  55   scoped_ptr<gpu::GLInProcessContext> context(gpu::GLInProcessContext::Create(
  56       service,
  57       surface,
  58       surface->IsOffscreen(),
  59       gfx::kNullAcceleratedWidget,
  60       surface->GetSize(),
  61       NULL /* share_context */,
  62       false /* share_resources */,
  63       attribs_for_gles2,
  64       gpu_preference,
  65       gpu::GLInProcessContextSharedMemoryLimits(),
  66       nullptr,
  67       nullptr));
  68   DCHECK(context.get());
  69
  70   return webkit::gpu::ContextProviderInProcess::Create(
  71       WebGraphicsContext3DInProcessCommandBufferImpl::WrapContext(
  72           context.Pass(), attributes),
  73       "Parent-Compositor");
  74 }
  75
  76 }  // namespace
  77
  78 HardwareRenderer::HardwareRenderer(SharedRendererState* state)
  79     : shared_renderer_state_(state),
  80       last_egl_context_(eglGetCurrentContext()),
  81       stencil_enabled_(false),
  82       viewport_clip_valid_for_dcheck_(false),
  83       gl_surface_(new AwGLSurface),
  84       root_layer_(cc::Layer::Create()),
  85       resource_collection_(new cc::DelegatedFrameResourceCollection),
  86       output_surface_(NULL) {
  87   DCHECK(last_egl_context_);
  88
  89   resource_collection_->SetClient(this);
  90
  91   cc::LayerTreeSettings settings;
  92
  93   // Should be kept in sync with compositor_impl_android.cc.
  94   settings.allow_antialiasing = false;
  95   settings.highp_threshold_min = 2048;
  96
  97   // Webview does not own the surface so should not clear it.
  98   settings.should_clear_root_render_pass = false;
  99
 100   // TODO(enne): Update this this compositor to use a synchronous scheduler.
 101   settings.single_thread_proxy_scheduler = false;
 102
 103   layer_tree_host_ = cc::LayerTreeHost::CreateSingleThreaded(
 104       this, this, NULL, NULL, settings, NULL);
 105   layer_tree_host_->SetRootLayer(root_layer_);
 106   layer_tree_host_->SetLayerTreeHostClientReady();
 107   layer_tree_host_->set_has_transparent_background(true);
 108 }
 109
 110 HardwareRenderer::~HardwareRenderer() {
 111   SetFrameData();
 112
 113   // Must reset everything before |resource_collection_| to ensure all
 114   // resources are returned before resetting |resource_collection_| client.
 115   layer_tree_host_.reset();
 116   root_layer_ = NULL;
 117   delegated_layer_ = NULL;
 118   frame_provider_ = NULL;
 119 #if DCHECK_IS_ON
 120   // Check collection is empty.
 121   cc::ReturnedResourceArray returned_resources;
 122   resource_collection_->TakeUnusedResourcesForChildCompositor(
 123       &returned_resources);
 124   DCHECK_EQ(0u, returned_resources.size());
 125 #endif  // DCHECK_IS_ON
 126
 127   resource_collection_->SetClient(NULL);
 128
 129   // Reset draw constraints.
 130   shared_renderer_state_->UpdateDrawConstraintsOnRT(
 131       ParentCompositorDrawConstraints());
 132 }
 133
 134 void HardwareRenderer::DidBeginMainFrame() {
 135   // This is called after OutputSurface is created, but before the impl frame
 136   // starts. We set the draw constraints here.
 137   DCHECK(output_surface_);
 138   DCHECK(viewport_clip_valid_for_dcheck_);
 139   output_surface_->SetExternalStencilTest(stencil_enabled_);
 140   output_surface_->SetDrawConstraints(viewport_, clip_);
 141 }
 142
 143 void HardwareRenderer::CommitFrame() {
 144   scroll_offset_ = shared_renderer_state_->GetScrollOffsetOnRT();
 145   if (committed_frame_.get()) {
 146     TRACE_EVENT_INSTANT0("android_webview",
 147                          "EarlyOut_PreviousFrameUnconsumed",
 148                          TRACE_EVENT_SCOPE_THREAD);
 149     shared_renderer_state_->DidSkipCommitFrameOnRT();
 150     return;
 151   }
 152
 153   committed_frame_ = shared_renderer_state_->PassCompositorFrameOnRT();
 154   // Happens with empty global visible rect.
 155   if (!committed_frame_.get())
 156     return;
 157
 158   DCHECK(!committed_frame_->gl_frame_data);
 159   DCHECK(!committed_frame_->software_frame_data);
 160
 161   // DelegatedRendererLayerImpl applies the inverse device_scale_factor of the
 162   // renderer frame, assuming that the browser compositor will scale
 163   // it back up to device scale.  But on Android we put our browser layers in
 164   // physical pixels and set our browser CC device_scale_factor to 1, so this
 165   // suppresses the transform.
 166   committed_frame_->delegated_frame_data->device_scale_factor = 1.0f;
 167 }
 168
 169 void HardwareRenderer::SetFrameData() {
 170   if (!committed_frame_.get())
 171     return;
 172
 173   scoped_ptr<cc::CompositorFrame> frame = committed_frame_.Pass();
 174   gfx::Size frame_size =
 175       frame->delegated_frame_data->render_pass_list.back()->output_rect.size();
 176   bool size_changed = frame_size != frame_size_;
 177   frame_size_ = frame_size;
 178
 179   if (!frame_provider_.get() || size_changed) {
 180     if (delegated_layer_.get()) {
 181       delegated_layer_->RemoveFromParent();
 182     }
 183
 184     frame_provider_ = new cc::DelegatedFrameProvider(
 185         resource_collection_.get(), frame->delegated_frame_data.Pass());
 186
 187     delegated_layer_ = cc::DelegatedRendererLayer::Create(frame_provider_);
 188     delegated_layer_->SetBounds(frame_size_);
 189     delegated_layer_->SetIsDrawable(true);
 190
 191     root_layer_->AddChild(delegated_layer_);
 192   } else {
 193     frame_provider_->SetFrameData(frame->delegated_frame_data.Pass());
 194   }
 195 }
 196
 197 void HardwareRenderer::DrawGL(bool stencil_enabled,
 198                               int framebuffer_binding_ext,
 199                               AwDrawGLInfo* draw_info) {
 200   TRACE_EVENT0("android_webview", "HardwareRenderer::DrawGL");
 201
 202   // We need to watch if the current Android context has changed and enforce
 203   // a clean-up in the compositor.
 204   EGLContext current_context = eglGetCurrentContext();
 205   DCHECK(current_context) << "DrawGL called without EGLContext";
 206
 207   // TODO(boliu): Handle context loss.
 208   if (last_egl_context_ != current_context)
 209     DLOG(WARNING) << "EGLContextChanged";
 210
 211   SetFrameData();
 212   if (shared_renderer_state_->ForceCommitOnRT()) {
 213     CommitFrame();
 214     SetFrameData();
 215   }
 216
 217   gfx::Transform transform(gfx::Transform::kSkipInitialization);
 218   transform.matrix().setColMajorf(draw_info->transform);
 219   transform.Translate(scroll_offset_.x(), scroll_offset_.y());
 220
 221   // Need to post the new transform matrix back to child compositor
 222   // because there is no onDraw during a Render Thread animation, and child
 223   // compositor might not have the tiles rasterized as the animation goes on.
 224   ParentCompositorDrawConstraints draw_constraints(
 225       draw_info->is_layer, transform, gfx::Rect(viewport_));
 226
 227   draw_constraints_ = draw_constraints;
 228   shared_renderer_state_->PostExternalDrawConstraintsToChildCompositorOnRT(
 229       draw_constraints);
 230
 231   if (!delegated_layer_.get())
 232     return;
 233
 234   viewport_.SetSize(draw_info->width, draw_info->height);
 235   layer_tree_host_->SetViewportSize(viewport_);
 236   clip_.SetRect(draw_info->clip_left,
 237                 draw_info->clip_top,
 238                 draw_info->clip_right - draw_info->clip_left,
 239                 draw_info->clip_bottom - draw_info->clip_top);
 240   stencil_enabled_ = stencil_enabled;
 241
 242   delegated_layer_->SetTransform(transform);
 243
 244   gl_surface_->SetBackingFrameBufferObject(framebuffer_binding_ext);
 245   {
 246     base::AutoReset<bool> frame_resetter(&viewport_clip_valid_for_dcheck_,
 247                                          true);
 248     layer_tree_host_->SetNeedsRedrawRect(clip_);
 249     layer_tree_host_->Composite(gfx::FrameTime::Now());
 250   }
 251   gl_surface_->ResetBackingFrameBufferObject();
 252 }
 253
 254 void HardwareRenderer::RequestNewOutputSurface(bool fallback) {
 255   // Android webview does not support losing output surface.
 256   DCHECK(!fallback);
 257   scoped_refptr<cc::ContextProvider> context_provider =
 258       CreateContext(gl_surface_,
 259                     DeferredGpuCommandService::GetInstance());
 260   scoped_ptr<ParentOutputSurface> output_surface_holder(
 261       new ParentOutputSurface(context_provider));
 262   output_surface_ = output_surface_holder.get();
 263   layer_tree_host_->SetOutputSurface(output_surface_holder.Pass());
 264 }
 265
 266 void HardwareRenderer::UnusedResourcesAreAvailable() {
 267   cc::ReturnedResourceArray returned_resources;
 268   resource_collection_->TakeUnusedResourcesForChildCompositor(
 269       &returned_resources);
 270   shared_renderer_state_->InsertReturnedResourcesOnRT(returned_resources);
 271 }
 272
 273 }  // namespace android_webview