// Copyright 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 "cc/raster/zero_copy_raster_buffer_provider.h"

#include <stdint.h>

#include <algorithm>

#include "base/macros.h"
#include "base/trace_event/process_memory_dump.h"
#include "base/trace_event/trace_event.h"
#include "base/trace_event/traced_value.h"
#include "cc/resources/resource_pool.h"
#include "components/viz/client/client_resource_provider.h"
#include "components/viz/common/gpu/context_provider.h"
#include "components/viz/common/resources/platform_color.h"
#include "components/viz/common/resources/resource_format_utils.h"
#include "gpu/command_buffer/client/gpu_memory_buffer_manager.h"
#include "gpu/command_buffer/client/shared_image_interface.h"
#include "gpu/command_buffer/common/gpu_memory_buffer_support.h"
#include "gpu/command_buffer/common/shared_image_trace_utils.h"
#include "gpu/command_buffer/common/shared_image_usage.h"
#include "ui/gfx/buffer_format_util.h"
#include "ui/gfx/gpu_memory_buffer.h"

namespace cc {
namespace {

constexpr static auto kBufferUsage = gfx::BufferUsage::GPU_READ_CPU_READ_WRITE;

// Subclass for InUsePoolResource that holds ownership of a zero-copy backing
// and does cleanup of the backing when destroyed.
class ZeroCopyGpuBacking : public ResourcePool::GpuBacking {
 public:
  ~ZeroCopyGpuBacking() override {
    if (mailbox.IsZero())
      return;
    if (returned_sync_token.HasData())
      shared_image_interface->DestroySharedImage(returned_sync_token, mailbox);
    else if (mailbox_sync_token.HasData())
      shared_image_interface->DestroySharedImage(mailbox_sync_token, mailbox);
  }

  void OnMemoryDump(
      base::trace_event::ProcessMemoryDump* pmd,
      const base::trace_event::MemoryAllocatorDumpGuid& buffer_dump_guid,
      uint64_t tracing_process_id,
      int importance) const override {
    if (!gpu_memory_buffer)
      return;
    gpu_memory_buffer->OnMemoryDump(pmd, buffer_dump_guid, tracing_process_id,
                                    importance);
  }

  // The SharedImageInterface used to clean up the shared image.
  gpu::SharedImageInterface* shared_image_interface = nullptr;
  // The backing for zero-copy gpu resources. The |texture_id| is bound to
  // this.
  std::unique_ptr<gfx::GpuMemoryBuffer> gpu_memory_buffer;
};

// RasterBuffer for the zero copy upload, which is given to the raster worker
// threads for raster/upload.
class ZeroCopyRasterBufferImpl : public RasterBuffer {
 public:
  ZeroCopyRasterBufferImpl(
      gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
      const ResourcePool::InUsePoolResource& in_use_resource,
      ZeroCopyGpuBacking* backing)
      : backing_(backing),
        gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
        resource_size_(in_use_resource.size()),
        resource_format_(in_use_resource.format()),
        resource_color_space_(in_use_resource.color_space()),
        gpu_memory_buffer_(std::move(backing_->gpu_memory_buffer)) {}

  ~ZeroCopyRasterBufferImpl() override {
    // If GpuMemoryBuffer allocation failed (https://crbug.com/554541), then
    // we don't have anything to give to the display compositor, so we report a
    // zero mailbox that will result in checkerboarding.
    if (!gpu_memory_buffer_) {
      DCHECK(backing_->mailbox.IsZero());
      return;
    }

    // This is destroyed on the compositor thread when raster is complete, but
    // before the backing is prepared for export to the display compositor. So
    // we can set up the texture and SyncToken here.
    // TODO(danakj): This could be done with the worker context in Playback. Do
    // we need to do things in IsResourceReadyToDraw() and OrderingBarrier then?
    gpu::SharedImageInterface* sii = backing_->shared_image_interface;
    if (backing_->mailbox.IsZero()) {
      uint32_t usage =
          gpu::SHARED_IMAGE_USAGE_DISPLAY | gpu::SHARED_IMAGE_USAGE_SCANOUT;
      // Make a mailbox for export of the GpuMemoryBuffer to the display
      // compositor.
      backing_->mailbox = sii->CreateSharedImage(gpu_memory_buffer_.get(),
                                                 gpu_memory_buffer_manager_,
                                                 resource_color_space_, usage);
    } else {
      sii->UpdateSharedImage(backing_->returned_sync_token, backing_->mailbox);
    }

    backing_->mailbox_sync_token = sii->GenUnverifiedSyncToken();
    backing_->gpu_memory_buffer = std::move(gpu_memory_buffer_);
  }

  // Overridden from RasterBuffer:
  void Playback(const RasterSource* raster_source,
                const gfx::Rect& raster_full_rect,
                const gfx::Rect& raster_dirty_rect,
                uint64_t new_content_id,
                const gfx::AxisTransform2d& transform,
                const RasterSource::PlaybackSettings& playback_settings,
                const GURL& url) override {
    TRACE_EVENT0("cc", "ZeroCopyRasterBuffer::Playback");

    if (!gpu_memory_buffer_) {
      gpu_memory_buffer_ = gpu_memory_buffer_manager_->CreateGpuMemoryBuffer(
          resource_size_, viz::BufferFormat(resource_format_), kBufferUsage,
          gpu::kNullSurfaceHandle);
      // Note that GpuMemoryBuffer allocation can fail.
      // https://crbug.com/554541
      if (!gpu_memory_buffer_)
        return;
    }

    DCHECK_EQ(1u, gfx::NumberOfPlanesForBufferFormat(
                      gpu_memory_buffer_->GetFormat()));
    bool rv = gpu_memory_buffer_->Map();
    DCHECK(rv);
    DCHECK(gpu_memory_buffer_->memory(0));
    // RasterBufferProvider::PlaybackToMemory only supports unsigned strides.
    DCHECK_GE(gpu_memory_buffer_->stride(0), 0);

    // TODO(danakj): Implement partial raster with raster_dirty_rect.
    RasterBufferProvider::PlaybackToMemory(
        gpu_memory_buffer_->memory(0), resource_format_, resource_size_,
        gpu_memory_buffer_->stride(0), raster_source, raster_full_rect,
        raster_full_rect, transform, resource_color_space_,
        /*gpu_compositing=*/true, playback_settings);
    gpu_memory_buffer_->Unmap();
  }

 private:
  // This field may only be used on the compositor thread.
  ZeroCopyGpuBacking* backing_;

  // These fields are for use on the worker thread.
  gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
  gfx::Size resource_size_;
  viz::ResourceFormat resource_format_;
  gfx::ColorSpace resource_color_space_;
  std::unique_ptr<gfx::GpuMemoryBuffer> gpu_memory_buffer_;

  DISALLOW_COPY_AND_ASSIGN(ZeroCopyRasterBufferImpl);
};

}  // namespace

ZeroCopyRasterBufferProvider::ZeroCopyRasterBufferProvider(
    gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
    viz::ContextProvider* compositor_context_provider,
    viz::ResourceFormat tile_format)
    : gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
      compositor_context_provider_(compositor_context_provider),
      tile_format_(tile_format) {}

ZeroCopyRasterBufferProvider::~ZeroCopyRasterBufferProvider() = default;

std::unique_ptr<RasterBuffer>
ZeroCopyRasterBufferProvider::AcquireBufferForRaster(
    const ResourcePool::InUsePoolResource& resource,
    uint64_t resource_content_id,
    uint64_t previous_content_id) {
  if (!resource.gpu_backing()) {
    auto backing = std::make_unique<ZeroCopyGpuBacking>();
    const gpu::Capabilities& caps =
        compositor_context_provider_->ContextCapabilities();
    backing->texture_target = gpu::GetBufferTextureTarget(
        gfx::BufferUsage::SCANOUT, BufferFormat(resource.format()), caps);
    backing->overlay_candidate = true;
    // This RasterBufferProvider will modify the resource outside of the
    // GL command stream. So resources should not become available for reuse
    // until they are not in use by the gpu anymore, which a fence is used
    // to determine.
    backing->wait_on_fence_required = true;
    backing->shared_image_interface =
        compositor_context_provider_->SharedImageInterface();
    resource.set_gpu_backing(std::move(backing));
  }
  ZeroCopyGpuBacking* backing =
      static_cast<ZeroCopyGpuBacking*>(resource.gpu_backing());

  return std::make_unique<ZeroCopyRasterBufferImpl>(gpu_memory_buffer_manager_,
                                                    resource, backing);
}

void ZeroCopyRasterBufferProvider::Flush() {}

viz::ResourceFormat ZeroCopyRasterBufferProvider::GetResourceFormat() const {
  return tile_format_;
}

bool ZeroCopyRasterBufferProvider::IsResourceSwizzleRequired() const {
  return !viz::PlatformColor::SameComponentOrder(GetResourceFormat());
}

bool ZeroCopyRasterBufferProvider::IsResourcePremultiplied() const {
  return true;
}

bool ZeroCopyRasterBufferProvider::CanPartialRasterIntoProvidedResource()
    const {
  return false;
}

bool ZeroCopyRasterBufferProvider::IsResourceReadyToDraw(
    const ResourcePool::InUsePoolResource& resource) const {
  // Zero-copy resources are immediately ready to draw.
  return true;
}

uint64_t ZeroCopyRasterBufferProvider::SetReadyToDrawCallback(
    const std::vector<const ResourcePool::InUsePoolResource*>& resources,
    const base::Closure& callback,
    uint64_t pending_callback_id) const {
  // Zero-copy resources are immediately ready to draw.
  return 0;
}

void ZeroCopyRasterBufferProvider::Shutdown() {}

bool ZeroCopyRasterBufferProvider::CheckRasterFinishedQueries() {
  return false;
}

}  // namespace cc