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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/graphics/canvas_resource_host.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/renderer/platform/graphics/canvas_resource_provider.h"
#include "third_party/blink/renderer/platform/graphics/gpu/shared_gpu_context.h"
namespace blink {
namespace {
bool CanUseGPU() {
base::WeakPtr<WebGraphicsContext3DProviderWrapper> context_provider_wrapper =
SharedGpuContext::ContextProviderWrapper();
return context_provider_wrapper &&
!context_provider_wrapper->ContextProvider().IsContextLost();
}
} // namespace
CanvasResourceHost::CanvasResourceHost(gfx::Size size) : size_(size) {}
CanvasResourceHost::~CanvasResourceHost() = default;
std::unique_ptr<CanvasResourceProvider>
CanvasResourceHost::ReplaceResourceProvider(
std::unique_ptr<CanvasResourceProvider> new_resource_provider) {
std::unique_ptr<CanvasResourceProvider> old_resource_provider =
std::move(resource_provider_);
resource_provider_ = std::move(new_resource_provider);
UpdateMemoryUsage();
if (resource_provider_) {
resource_provider_->AlwaysEnableRasterTimersForTesting(
always_enable_raster_timers_for_testing_);
}
if (old_resource_provider) {
old_resource_provider->SetCanvasResourceHost(nullptr);
}
return old_resource_provider;
}
void CanvasResourceHost::DiscardResourceProvider() {
resource_provider_ = nullptr;
UpdateMemoryUsage();
}
void CanvasResourceHost::SetPreferred2DRasterMode(RasterModeHint hint) {
// TODO(junov): move code that switches between CPU and GPU rasterization
// to here.
preferred_2d_raster_mode_ = hint;
}
bool CanvasResourceHost::ShouldTryToUseGpuRaster() const {
return preferred_2d_raster_mode_ == RasterModeHint::kPreferGPU && CanUseGPU();
}
bool CanvasResourceHost::IsComposited() const {
if (IsHibernating()) {
return false;
}
if (!resource_provider_) [[unlikely]] {
return false;
}
return resource_provider_->SupportsDirectCompositing() &&
!LowLatencyEnabled();
}
RasterMode CanvasResourceHost::GetRasterMode() const {
if (IsHibernating()) {
return RasterMode::kCPU;
}
if (resource_provider_) {
return resource_provider_->IsAccelerated() ? RasterMode::kGPU
: RasterMode::kCPU;
}
// Whether or not to accelerate is not yet resolved, the canvas cannot be
// accelerated if the gpu context is lost.
return ShouldTryToUseGpuRaster() ? RasterMode::kGPU : RasterMode::kCPU;
}
void CanvasResourceHost::FlushRecording(FlushReason reason) {
if (resource_provider_) {
resource_provider_->FlushCanvas(reason);
}
}
} // namespace blink
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