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