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