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