text: // Copyright (c) 2013 The Chromium 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 "ui/compositor/test/in_process_context_provider.h"
  
  #include "base/bind.h"
  #include "base/callback_helpers.h"
  #include "base/lazy_instance.h"
  #include "base/macros.h"
  #include "base/strings/stringprintf.h"
  #include "base/threading/thread_task_runner_handle.h"
  #include "base/trace_event/trace_event.h"
  #include "components/viz/common/gpu/context_cache_controller.h"
  #include "gpu/command_buffer/client/gles2_implementation.h"
  #include "gpu/command_buffer/client/raster_implementation_gles.h"
  #include "gpu/command_buffer/client/shared_memory_limits.h"
  #include "gpu/ipc/gl_in_process_context.h"
  #include "gpu/skia_bindings/grcontext_for_gles2_interface.h"
  #include "third_party/skia/include/gpu/GrContext.h"
  #include "third_party/skia/include/gpu/gl/GrGLInterface.h"
  
  namespace ui {
  
  // static
  scoped_refptr<InProcessContextProvider> InProcessContextProvider::Create(
      const gpu::ContextCreationAttribs& attribs,
      gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
      gpu::ImageFactory* image_factory,
      gpu::SurfaceHandle window,
      const std::string& debug_name,
      bool support_locking) {
    return new InProcessContextProvider(attribs, gpu_memory_buffer_manager,
                                        image_factory, window, debug_name,
                                        support_locking);
  }
  
  // static
  scoped_refptr<InProcessContextProvider>
  InProcessContextProvider::CreateOffscreen(
      gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
      gpu::ImageFactory* image_factory,
      bool support_locking) {
    gpu::ContextCreationAttribs attribs;
    attribs.alpha_size = 8;
    attribs.blue_size = 8;
    attribs.green_size = 8;
    attribs.red_size = 8;
    attribs.depth_size = 0;
    attribs.stencil_size = 8;
    attribs.samples = 0;
    attribs.sample_buffers = 0;
    attribs.fail_if_major_perf_caveat = false;
    attribs.bind_generates_resource = false;
    return new InProcessContextProvider(attribs, gpu_memory_buffer_manager,
                                        image_factory, gpu::kNullSurfaceHandle,
                                        "Offscreen", support_locking);
  }
  
  InProcessContextProvider::InProcessContextProvider(
      const gpu::ContextCreationAttribs& attribs,
      gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
      gpu::ImageFactory* image_factory,
      gpu::SurfaceHandle window,
      const std::string& debug_name,
      bool support_locking)
      : support_locking_(support_locking),
        attribs_(attribs),
        gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
        image_factory_(image_factory),
        window_(window),
        debug_name_(debug_name) {
    DCHECK(main_thread_checker_.CalledOnValidThread());
    context_thread_checker_.DetachFromThread();
  }
  
  InProcessContextProvider::~InProcessContextProvider() {
    DCHECK(main_thread_checker_.CalledOnValidThread() ||
           context_thread_checker_.CalledOnValidThread());
  }
  
  void InProcessContextProvider::AddRef() const {
    base::RefCountedThreadSafe<InProcessContextProvider>::AddRef();
  }
  
  void InProcessContextProvider::Release() const {
    base::RefCountedThreadSafe<InProcessContextProvider>::Release();
  }
  
  gpu::ContextResult InProcessContextProvider::BindToCurrentThread() {
    // This is called on the thread the context will be used.
    DCHECK(context_thread_checker_.CalledOnValidThread());
  
    if (bind_tried_)
      return bind_result_;
    bind_tried_ = true;
  
    context_ = gpu::GLInProcessContext::CreateWithoutInit();
    bind_result_ = context_->Initialize(
        nullptr,  /* service */
        nullptr,  /* surface */
        !window_, /* is_offscreen */
        window_, attribs_, gpu::SharedMemoryLimits(), gpu_memory_buffer_manager_,
        image_factory_, nullptr /* gpu_channel_manager_delegate */,
        base::ThreadTaskRunnerHandle::Get());
  
    if (bind_result_ != gpu::ContextResult::kSuccess)
      return bind_result_;
  
    cache_controller_ = std::make_unique<viz::ContextCacheController>(
        context_->GetImplementation(), base::ThreadTaskRunnerHandle::Get());
    if (support_locking_)
      cache_controller_->SetLock(GetLock());
  
    std::string unique_context_name =
        base::StringPrintf("%s-%p", debug_name_.c_str(), context_.get());
    context_->GetImplementation()->TraceBeginCHROMIUM(
        "gpu_toplevel", unique_context_name.c_str());
  
    raster_context_ = std::make_unique<gpu::raster::RasterImplementationGLES>(
        context_->GetImplementation(),
        context_->GetImplementation()->command_buffer(),
        context_->GetImplementation()->capabilities());
  
    return bind_result_;
  }
  
  const gpu::Capabilities& InProcessContextProvider::ContextCapabilities() const {
    CheckValidThreadOrLockAcquired();
    return context_->GetImplementation()->capabilities();
  }
  
  const gpu::GpuFeatureInfo& InProcessContextProvider::GetGpuFeatureInfo() const {
    CheckValidThreadOrLockAcquired();
    return context_->GetGpuFeatureInfo();
  }
  
  gpu::gles2::GLES2Interface* InProcessContextProvider::ContextGL() {
    CheckValidThreadOrLockAcquired();
    return context_->GetImplementation();
  }
  
  gpu::raster::RasterInterface* InProcessContextProvider::RasterInterface() {
    CheckValidThreadOrLockAcquired();
  
    return raster_context_.get();
  }
  
  gpu::ContextSupport* InProcessContextProvider::ContextSupport() {
    return context_->GetImplementation();
  }
  
  class GrContext* InProcessContextProvider::GrContext() {
    CheckValidThreadOrLockAcquired();
  
    if (gr_context_)
      return gr_context_->get();
  
    size_t max_resource_cache_bytes;
    size_t max_glyph_cache_texture_bytes;
    skia_bindings::GrContextForGLES2Interface::DefaultCacheLimitsForTests(
        &max_resource_cache_bytes, &max_glyph_cache_texture_bytes);
    gr_context_.reset(new skia_bindings::GrContextForGLES2Interface(
        ContextGL(), ContextSupport(), ContextCapabilities(),
        max_resource_cache_bytes, max_glyph_cache_texture_bytes));
    cache_controller_->SetGrContext(gr_context_->get());
  
    return gr_context_->get();
  }
  
  viz::ContextCacheController* InProcessContextProvider::CacheController() {
    CheckValidThreadOrLockAcquired();
    return cache_controller_.get();
  }
  
  base::Lock* InProcessContextProvider::GetLock() {
    if (!support_locking_)
      return nullptr;
    return &context_lock_;
  }
  
  void InProcessContextProvider::AddObserver(viz::ContextLostObserver* obs) {
    // Pixel tests do not test lost context.
  }
  
  void InProcessContextProvider::RemoveObserver(viz::ContextLostObserver* obs) {
    // Pixel tests do not test lost context.
  }
  
  uint32_t InProcessContextProvider::GetCopyTextureInternalFormat() {
    if (attribs_.alpha_size > 0)
      return GL_RGBA;
    DCHECK_NE(attribs_.red_size, 0);
    DCHECK_NE(attribs_.green_size, 0);
    DCHECK_NE(attribs_.blue_size, 0);
    return GL_RGB;
  }
  
  }  // namespace ui
  