// Copyright 2014 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/test/test_gpu_memory_buffer_manager.h"

#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
#include "ui/gfx/buffer_format_util.h"
#include "ui/gfx/gpu_memory_buffer.h"

namespace cc {
namespace {

class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
 public:
  GpuMemoryBufferImpl(const gfx::Size& size,
                      gfx::BufferFormat format,
                      scoped_ptr<base::SharedMemory> shared_memory)
      : size_(size),
        format_(format),
        shared_memory_(shared_memory.Pass()),
        mapped_(false) {}

  // Overridden from gfx::GpuMemoryBuffer:
  bool Map(void** data) override {
    DCHECK(!mapped_);
    if (!shared_memory_->Map(gfx::BufferSizeForBufferFormat(size_, format_)))
      return false;
    mapped_ = true;
    size_t offset = 0;
    int num_planes =
        static_cast<int>(gfx::NumberOfPlanesForBufferFormat(format_));
    for (int i = 0; i < num_planes; ++i) {
      data[i] = reinterpret_cast<uint8*>(shared_memory_->memory()) + offset;
      offset +=
          gfx::RowSizeForBufferFormat(size_.width(), format_, i) *
          (size_.height() / gfx::SubsamplingFactorForBufferFormat(format_, i));
    }
    return true;
  }
  void Unmap() override {
    DCHECK(mapped_);
    shared_memory_->Unmap();
    mapped_ = false;
  }
  gfx::Size GetSize() const override { return size_; }
  gfx::BufferFormat GetFormat() const override { return format_; }
  void GetStride(int* stride) const override {
    int num_planes =
        static_cast<int>(gfx::NumberOfPlanesForBufferFormat(format_));
    for (int i = 0; i < num_planes; ++i)
      stride[i] = base::checked_cast<int>(
          gfx::RowSizeForBufferFormat(size_.width(), format_, i));
  }
  gfx::GpuMemoryBufferId GetId() const override {
    NOTREACHED();
    return gfx::GpuMemoryBufferId(0);
  }
  gfx::GpuMemoryBufferHandle GetHandle() const override {
    gfx::GpuMemoryBufferHandle handle;
    handle.type = gfx::SHARED_MEMORY_BUFFER;
    handle.handle = shared_memory_->handle();
    return handle;
  }
  ClientBuffer AsClientBuffer() override {
    return reinterpret_cast<ClientBuffer>(this);
  }

 private:
  const gfx::Size size_;
  gfx::BufferFormat format_;
  scoped_ptr<base::SharedMemory> shared_memory_;
  bool mapped_;
};

}  // namespace

TestGpuMemoryBufferManager::TestGpuMemoryBufferManager() {
}

TestGpuMemoryBufferManager::~TestGpuMemoryBufferManager() {
}

scoped_ptr<gfx::GpuMemoryBuffer>
TestGpuMemoryBufferManager::AllocateGpuMemoryBuffer(const gfx::Size& size,
                                                    gfx::BufferFormat format,
                                                    gfx::BufferUsage usage) {
  scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory);
  const size_t buffer_size = gfx::BufferSizeForBufferFormat(size, format);
  if (!shared_memory->CreateAnonymous(buffer_size))
    return nullptr;
  return make_scoped_ptr<gfx::GpuMemoryBuffer>(
      new GpuMemoryBufferImpl(size, format, shared_memory.Pass()));
}

scoped_ptr<gfx::GpuMemoryBuffer>
TestGpuMemoryBufferManager::CreateGpuMemoryBufferFromHandle(
    const gfx::GpuMemoryBufferHandle& handle,
    const gfx::Size& size,
    gfx::BufferFormat format) {
  NOTREACHED();
  return nullptr;
}

gfx::GpuMemoryBuffer*
TestGpuMemoryBufferManager::GpuMemoryBufferFromClientBuffer(
    ClientBuffer buffer) {
  return reinterpret_cast<gfx::GpuMemoryBuffer*>(buffer);
}

void TestGpuMemoryBufferManager::SetDestructionSyncPoint(
    gfx::GpuMemoryBuffer* buffer,
    uint32 sync_point) {
}

}  // namespace cc