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     gpu::GLInProcessContext* share_context) {
  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(
  57       gpu::GLInProcessContext::Create(service,
  58                                       surface,
  59                                       surface->IsOffscreen(),
  60                                       gfx::kNullAcceleratedWidget,
  61                                       surface->GetSize(),
  62                                       share_context,
  63                                       false /* share_resources */,
  64                                       attribs_for_gles2,
  65                                       gpu_preference));
  66   DCHECK(context.get());
  67
  68   return webkit::gpu::ContextProviderInProcess::Create(
  69       WebGraphicsContext3DInProcessCommandBufferImpl::WrapContext(
  70           context.Pass(), attributes),
  71       "Parent-Compositor");
  72 }
  73
  74 }  // namespace
  75
  76 HardwareRenderer::HardwareRenderer(SharedRendererState* state)
  77     : shared_renderer_state_(state),
  78       last_egl_context_(eglGetCurrentContext()),
  79       stencil_enabled_(false),
  80       viewport_clip_valid_for_dcheck_(false),
  81       gl_surface_(new AwGLSurface),
  82       root_layer_(cc::Layer::Create()),
  83       resource_collection_(new cc::DelegatedFrameResourceCollection),
  84       output_surface_(NULL) {
  85   DCHECK(last_egl_context_);
  86
  87   resource_collection_->SetClient(this);
  88
  89   cc::LayerTreeSettings settings;
  90
  91   // Should be kept in sync with compositor_impl_android.cc.
  92   settings.allow_antialiasing = false;
  93   settings.highp_threshold_min = 2048;
  94
  95   // Webview does not own the surface so should not clear it.
  96   settings.should_clear_root_render_pass = false;
  97
  98   layer_tree_host_ =
  99       cc::LayerTreeHost::CreateSingleThreaded(this, this, NULL, settings, NULL);
 100   layer_tree_host_->SetRootLayer(root_layer_);
 101   layer_tree_host_->SetLayerTreeHostClientReady();
 102   layer_tree_host_->set_has_transparent_background(true);
 103 }
 104
 105 HardwareRenderer::~HardwareRenderer() {
 106   // Must reset everything before |resource_collection_| to ensure all
 107   // resources are returned before resetting |resource_collection_| client.
 108   layer_tree_host_.reset();
 109   root_layer_ = NULL;
 110   delegated_layer_ = NULL;
 111   frame_provider_ = NULL;
 112 #if DCHECK_IS_ON
 113   // Check collection is empty.
 114   cc::ReturnedResourceArray returned_resources;
 115   resource_collection_->TakeUnusedResourcesForChildCompositor(
 116       &returned_resources);
 117   DCHECK_EQ(0u, returned_resources.size());
 118 #endif  // DCHECK_IS_ON
 119
 120   resource_collection_->SetClient(NULL);
 121
 122   // Reset draw constraints.
 123   shared_renderer_state_->UpdateDrawConstraints(
 124       ParentCompositorDrawConstraints());
 125 }
 126
 127 void HardwareRenderer::DidBeginMainFrame() {
 128   // This is called after OutputSurface is created, but before the impl frame
 129   // starts. We set the draw constraints here.
 130   DCHECK(output_surface_);
 131   DCHECK(viewport_clip_valid_for_dcheck_);
 132   output_surface_->SetExternalStencilTest(stencil_enabled_);
 133   output_surface_->SetDrawConstraints(viewport_, clip_);
 134 }
 135
 136 void HardwareRenderer::CommitFrame() {
 137   scoped_ptr<DrawGLInput> input = shared_renderer_state_->PassDrawGLInput();
 138   if (!input.get()) {
 139     DLOG(WARNING) << "No frame to commit";
 140     return;
 141   }
 142
 143   DCHECK(!input->frame.gl_frame_data);
 144   DCHECK(!input->frame.software_frame_data);
 145
 146   // DelegatedRendererLayerImpl applies the inverse device_scale_factor of the
 147   // renderer frame, assuming that the browser compositor will scale
 148   // it back up to device scale.  But on Android we put our browser layers in
 149   // physical pixels and set our browser CC device_scale_factor to 1, so this
 150   // suppresses the transform.
 151   input->frame.delegated_frame_data->device_scale_factor = 1.0f;
 152
 153   gfx::Size frame_size =
 154       input->frame.delegated_frame_data->render_pass_list.back()
 155           ->output_rect.size();
 156   bool size_changed = frame_size != frame_size_;
 157   frame_size_ = frame_size;
 158   scroll_offset_ = input->scroll_offset;
 159
 160   if (!frame_provider_ || size_changed) {
 161     if (delegated_layer_) {
 162       delegated_layer_->RemoveFromParent();
 163     }
 164
 165     frame_provider_ = new cc::DelegatedFrameProvider(
 166         resource_collection_.get(), input->frame.delegated_frame_data.Pass());
 167
 168     delegated_layer_ = cc::DelegatedRendererLayer::Create(frame_provider_);
 169     delegated_layer_->SetBounds(gfx::Size(input->width, input->height));
 170     delegated_layer_->SetIsDrawable(true);
 171
 172     root_layer_->AddChild(delegated_layer_);
 173   } else {
 174     frame_provider_->SetFrameData(input->frame.delegated_frame_data.Pass());
 175   }
 176 }
 177
 178 void HardwareRenderer::DrawGL(bool stencil_enabled,
 179                               int framebuffer_binding_ext,
 180                               AwDrawGLInfo* draw_info) {
 181   TRACE_EVENT0("android_webview", "HardwareRenderer::DrawGL");
 182
 183   // We need to watch if the current Android context has changed and enforce
 184   // a clean-up in the compositor.
 185   EGLContext current_context = eglGetCurrentContext();
 186   if (!current_context) {
 187     DLOG(ERROR) << "DrawGL called without EGLContext";
 188     return;
 189   }
 190
 191   if (!delegated_layer_.get()) {
 192     DLOG(ERROR) << "No frame committed";
 193     return;
 194   }
 195
 196   // TODO(boliu): Handle context loss.
 197   if (last_egl_context_ != current_context)
 198     DLOG(WARNING) << "EGLContextChanged";
 199
 200   gfx::Transform transform(gfx::Transform::kSkipInitialization);
 201   transform.matrix().setColMajorf(draw_info->transform);
 202   transform.Translate(scroll_offset_.x(), scroll_offset_.y());
 203
 204   // Need to post the new transform matrix back to child compositor
 205   // because there is no onDraw during a Render Thread animation, and child
 206   // compositor might not have the tiles rasterized as the animation goes on.
 207   ParentCompositorDrawConstraints draw_constraints(
 208       draw_info->is_layer, transform, gfx::Rect(viewport_));
 209   if (!draw_constraints_.Equals(draw_constraints)) {
 210     draw_constraints_ = draw_constraints;
 211     shared_renderer_state_->PostExternalDrawConstraintsToChildCompositor(
 212         draw_constraints);
 213   }
 214
 215   viewport_.SetSize(draw_info->width, draw_info->height);
 216   layer_tree_host_->SetViewportSize(viewport_);
 217   clip_.SetRect(draw_info->clip_left,
 218                 draw_info->clip_top,
 219                 draw_info->clip_right - draw_info->clip_left,
 220                 draw_info->clip_bottom - draw_info->clip_top);
 221   stencil_enabled_ = stencil_enabled;
 222
 223   delegated_layer_->SetTransform(transform);
 224
 225   gl_surface_->SetBackingFrameBufferObject(framebuffer_binding_ext);
 226   {
 227     base::AutoReset<bool> frame_resetter(&viewport_clip_valid_for_dcheck_,
 228                                          true);
 229     layer_tree_host_->SetNeedsRedrawRect(clip_);
 230     layer_tree_host_->Composite(gfx::FrameTime::Now());
 231   }
 232   gl_surface_->ResetBackingFrameBufferObject();
 233 }
 234
 235 scoped_ptr<cc::OutputSurface> HardwareRenderer::CreateOutputSurface(
 236     bool fallback) {
 237   // Android webview does not support losing output surface.
 238   DCHECK(!fallback);
 239   scoped_refptr<cc::ContextProvider> context_provider =
 240       CreateContext(gl_surface_,
 241                     DeferredGpuCommandService::GetInstance(),
 242                     shared_renderer_state_->GetSharedContext());
 243   scoped_ptr<ParentOutputSurface> output_surface_holder(
 244       new ParentOutputSurface(context_provider));
 245   output_surface_ = output_surface_holder.get();
 246   return output_surface_holder.PassAs<cc::OutputSurface>();
 247 }
 248
 249 void HardwareRenderer::UnusedResourcesAreAvailable() {
 250   cc::ReturnedResourceArray returned_resources;
 251   resource_collection_->TakeUnusedResourcesForChildCompositor(
 252       &returned_resources);
 253   shared_renderer_state_->InsertReturnedResources(returned_resources);
 254 }
 255
 256 }  // namespace android_webview