gpu: Compositor management of GpuMemoryBuffer instances.

cc/test/test_gpu_memory_buffer_manager.cc

+// 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 "ui/gfx/gpu_memory_buffer.h"
+
+namespace cc {
+namespace {
+
+class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
+ public:
+  GpuMemoryBufferImpl(const gfx::Size& size, Format format)
+      : size_(size),
+        format_(format),
+        pixels_(new uint8[size.GetArea() * BytesPerPixel(format)]),
+        mapped_(false) {}
+
+  // Overridden from gfx::GpuMemoryBuffer:
+  virtual void* Map() override {
+    mapped_ = true;
+    return pixels_.get();
+  }
+  virtual void Unmap() override { mapped_ = false; }
+  virtual bool IsMapped() const override { return mapped_; }
+  virtual Format GetFormat() const override { return format_; }
+  virtual uint32 GetStride() const override {
+    return size_.width() * BytesPerPixel(format_);
+  }
+  virtual gfx::GpuMemoryBufferHandle GetHandle() const override {
+    NOTREACHED();
+    return gfx::GpuMemoryBufferHandle();
+  }
+  virtual ClientBuffer AsClientBuffer() override {
+    return reinterpret_cast<ClientBuffer>(this);
+  }
+
+ private:
+  static size_t BytesPerPixel(Format format) {
+    switch (format) {
+      case RGBA_8888:
+      case RGBX_8888:
+      case BGRA_8888:
+        return 4;
+    }
+
+    NOTREACHED();
+    return 0;
+  }
+
+  const gfx::Size size_;
+  gfx::GpuMemoryBuffer::Format format_;
+  scoped_ptr<uint8[]> pixels_;
+  bool mapped_;
+};
+
+}  // namespace
+
+TestGpuMemoryBufferManager::TestGpuMemoryBufferManager() {
+}
+
+TestGpuMemoryBufferManager::~TestGpuMemoryBufferManager() {
+}
+
+scoped_ptr<gfx::GpuMemoryBuffer>
+TestGpuMemoryBufferManager::AllocateGpuMemoryBuffer(
+    const gfx::Size& size,
+    gfx::GpuMemoryBuffer::Format format,
+    gfx::GpuMemoryBuffer::Usage usage) {
+  return make_scoped_ptr<gfx::GpuMemoryBuffer>(
+      new GpuMemoryBufferImpl(size, format));
+}
+
+gfx::GpuMemoryBuffer*
+TestGpuMemoryBufferManager::GpuMemoryBufferFromClientBuffer(
+    ClientBuffer buffer) {
+  return reinterpret_cast<gfx::GpuMemoryBuffer*>(buffer);
+}
+
+}  // namespace cc