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       root_layer_(cc::Layer::Create()),
  80       output_surface_(NULL) {
  81   DCHECK(last_egl_context_);
  82
  83   gl_surface_ = new AwGLSurface;
  84
  85   cc::LayerTreeSettings settings;
  86
  87   // Should be kept in sync with compositor_impl_android.cc.
  88   settings.allow_antialiasing = false;
  89   settings.highp_threshold_min = 2048;
  90
  91   // Webview does not own the surface so should not clear it.
  92   settings.should_clear_root_render_pass = false;
  93
  94   layer_tree_host_ =
  95       cc::LayerTreeHost::CreateSingleThreaded(this, this, NULL, settings);
  96   layer_tree_host_->SetRootLayer(root_layer_);
  97   layer_tree_host_->SetLayerTreeHostClientReady();
  98 }
  99
 100 HardwareRenderer::~HardwareRenderer() {
 101   // Must reset everything before |resource_collection_| to ensure all
 102   // resources are returned before resetting |resource_collection_| client.
 103   layer_tree_host_.reset();
 104   root_layer_ = NULL;
 105   delegated_layer_ = NULL;
 106   frame_provider_ = NULL;
 107   if (resource_collection_.get()) {
 108 #if DCHECK_IS_ON
 109     // Check collection is empty.
 110     cc::ReturnedResourceArray returned_resources;
 111     resource_collection_->TakeUnusedResourcesForChildCompositor(
 112         &returned_resources);
 113     DCHECK_EQ(0u, returned_resources.size());
 114 #endif  // DCHECK_IS_ON
 115
 116     resource_collection_->SetClient(NULL);
 117   }
 118 }
 119
 120 void HardwareRenderer::DidBeginMainFrame() {
 121   // This is called after OutputSurface is created, but before the impl frame
 122   // starts. We set the draw constraints here.
 123   DCHECK(output_surface_);
 124   DCHECK(viewport_clip_valid_for_dcheck_);
 125   output_surface_->SetExternalStencilTest(stencil_enabled_);
 126   output_surface_->SetDrawConstraints(viewport_, clip_);
 127 }
 128
 129 bool HardwareRenderer::DrawGL(bool stencil_enabled,
 130                               int framebuffer_binding_ext,
 131                               AwDrawGLInfo* draw_info) {
 132   TRACE_EVENT0("android_webview", "HardwareRenderer::DrawGL");
 133
 134   // We need to watch if the current Android context has changed and enforce
 135   // a clean-up in the compositor.
 136   EGLContext current_context = eglGetCurrentContext();
 137   if (!current_context) {
 138     DLOG(ERROR) << "DrawGL called without EGLContext";
 139     return false;
 140   }
 141
 142   // TODO(boliu): Handle context loss.
 143   if (last_egl_context_ != current_context)
 144     DLOG(WARNING) << "EGLContextChanged";
 145
 146   scoped_ptr<DrawGLInput> input = shared_renderer_state_->PassDrawGLInput();
 147   if (!resource_collection_.get()) {
 148     resource_collection_ = new cc::DelegatedFrameResourceCollection;
 149     resource_collection_->SetClient(this);
 150   }
 151
 152   if (input.get()) {
 153     DCHECK(!input->frame.gl_frame_data);
 154     DCHECK(!input->frame.software_frame_data);
 155
 156     // DelegatedRendererLayerImpl applies the inverse device_scale_factor of the
 157     // renderer frame, assuming that the browser compositor will scale
 158     // it back up to device scale.  But on Android we put our browser layers in
 159     // physical pixels and set our browser CC device_scale_factor to 1, so this
 160     // suppresses the transform.
 161     input->frame.delegated_frame_data->device_scale_factor = 1.0f;
 162
 163     gfx::Size frame_size =
 164         input->frame.delegated_frame_data->render_pass_list.back()
 165             ->output_rect.size();
 166     bool size_changed = frame_size != frame_size_;
 167     frame_size_ = frame_size;
 168     scroll_offset_ = input->scroll_offset;
 169
 170     if (!frame_provider_ || size_changed) {
 171       if (delegated_layer_) {
 172         delegated_layer_->RemoveFromParent();
 173       }
 174
 175       frame_provider_ = new cc::DelegatedFrameProvider(
 176           resource_collection_.get(), input->frame.delegated_frame_data.Pass());
 177
 178       delegated_layer_ = cc::DelegatedRendererLayer::Create(frame_provider_);
 179       delegated_layer_->SetBounds(gfx::Size(input->width, input->height));
 180       delegated_layer_->SetIsDrawable(true);
 181
 182       root_layer_->AddChild(delegated_layer_);
 183     } else {
 184       frame_provider_->SetFrameData(input->frame.delegated_frame_data.Pass());
 185     }
 186   }
 187
 188   viewport_.SetSize(draw_info->width, draw_info->height);
 189   layer_tree_host_->SetViewportSize(viewport_);
 190   clip_.SetRect(draw_info->clip_left,
 191                 draw_info->clip_top,
 192                 draw_info->clip_right - draw_info->clip_left,
 193                 draw_info->clip_bottom - draw_info->clip_top);
 194   stencil_enabled_ = stencil_enabled;
 195
 196   gfx::Transform transform(gfx::Transform::kSkipInitialization);
 197   transform.matrix().setColMajorf(draw_info->transform);
 198   transform.Translate(scroll_offset_.x(), scroll_offset_.y());
 199   delegated_layer_->SetTransform(transform);
 200
 201   gl_surface_->SetBackingFrameBufferObject(framebuffer_binding_ext);
 202   {
 203     base::AutoReset<bool> frame_resetter(&viewport_clip_valid_for_dcheck_,
 204                                          true);
 205     layer_tree_host_->SetNeedsRedrawRect(clip_);
 206     layer_tree_host_->Composite(gfx::FrameTime::Now());
 207   }
 208   gl_surface_->ResetBackingFrameBufferObject();
 209
 210   return true;
 211 }
 212
 213 scoped_ptr<cc::OutputSurface> HardwareRenderer::CreateOutputSurface(
 214     bool fallback) {
 215   // Android webview does not support losing output surface.
 216   DCHECK(!fallback);
 217   scoped_refptr<cc::ContextProvider> context_provider =
 218       CreateContext(gl_surface_,
 219                     DeferredGpuCommandService::GetInstance(),
 220                     shared_renderer_state_->GetSharedContext());
 221   scoped_ptr<ParentOutputSurface> output_surface_holder(
 222       new ParentOutputSurface(context_provider));
 223   output_surface_ = output_surface_holder.get();
 224   return output_surface_holder.PassAs<cc::OutputSurface>();
 225 }
 226
 227 void HardwareRenderer::UnusedResourcesAreAvailable() {
 228   cc::ReturnedResourceArray returned_resources;
 229   resource_collection_->TakeUnusedResourcesForChildCompositor(
 230       &returned_resources);
 231   shared_renderer_state_->InsertReturnedResources(returned_resources);
 232 }
 233
 234 }  // namespace android_webview