| // Copyright 2017 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "flutter/shell/common/io_manager.h" |
| |
| #include "flutter/fml/message_loop.h" |
| #include "third_party/skia/include/gpu/gl/GrGLInterface.h" |
| |
| namespace shell { |
| |
| sk_sp<GrContext> IOManager::CreateCompatibleResourceLoadingContext( |
| GrBackend backend) { |
| if (backend != GrBackend::kOpenGL_GrBackend) { |
| return nullptr; |
| } |
| |
| GrContextOptions options = {}; |
| |
| // There is currently a bug with doing GPU YUV to RGB conversions on the IO |
| // thread. The necessary work isn't being flushed or synchronized with the |
| // other threads correctly, so the textures end up blank. For now, suppress |
| // that feature, which will cause texture uploads to do CPU YUV conversion. |
| options.fDisableGpuYUVConversion = true; |
| |
| // To get video playback on the widest range of devices, we limit Skia to |
| // ES2 shading language when the ES3 external image extension is missing. |
| options.fPreferExternalImagesOverES3 = true; |
| |
| if (auto context = GrContext::MakeGL(GrGLMakeNativeInterface(), options)) { |
| // Do not cache textures created by the image decoder. These textures |
| // should be deleted when they are no longer referenced by an SkImage. |
| context->setResourceCacheLimits(0, 0); |
| return context; |
| } |
| |
| return nullptr; |
| } |
| |
| IOManager::IOManager(sk_sp<GrContext> resource_context, |
| fml::RefPtr<fml::TaskRunner> unref_queue_task_runner) |
| : resource_context_(std::move(resource_context)), |
| resource_context_weak_factory_( |
| resource_context_ ? std::make_unique<fml::WeakPtrFactory<GrContext>>( |
| resource_context_.get()) |
| : nullptr), |
| unref_queue_(fml::MakeRefCounted<flow::SkiaUnrefQueue>( |
| std::move(unref_queue_task_runner), |
| fml::TimeDelta::FromMilliseconds(250))), |
| weak_factory_(this) { |
| if (!resource_context_) { |
| FML_DLOG(WARNING) << "The IO manager was initialized without a resource " |
| "context. Async texture uploads will be disabled. " |
| "Expect performance degradation."; |
| } |
| } |
| |
| IOManager::~IOManager() { |
| // Last chance to drain the IO queue as the platform side reference to the |
| // underlying OpenGL context may be going away. |
| unref_queue_->Drain(); |
| } |
| |
| fml::WeakPtr<GrContext> IOManager::GetResourceContext() const { |
| return resource_context_weak_factory_ |
| ? resource_context_weak_factory_->GetWeakPtr() |
| : fml::WeakPtr<GrContext>(); |
| } |
| |
| fml::RefPtr<flow::SkiaUnrefQueue> IOManager::GetSkiaUnrefQueue() const { |
| return unref_queue_; |
| } |
| |
| } // namespace shell |