Update GPU memory buffers to use StrideInBytes internally.

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 "base/logging.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
 namespace cc {
 namespace {
 
-size_t BytesPerPixel(gfx::GpuMemoryBuffer::Format format) {
+size_t BitsPerPixel(gfx::GpuMemoryBuffer::Format format) {
   switch (format) {
     case gfx::GpuMemoryBuffer::RGBA_8888:
     case gfx::GpuMemoryBuffer::RGBX_8888:
     case gfx::GpuMemoryBuffer::BGRA_8888:
-      return 4;
+      return 32;
   }
 
   NOTREACHED();
   return 0;
 }
 
+size_t PixelsToBytes(size_t pixel_count, gfx::GpuMemoryBuffer::Format format) {
+  size_t size_in_bits = pixel_count * BitsPerPixel(format);
+  DCHECK_EQ(size_in_bits % 8, 0u);
+  return size_in_bits / 8;
+}
+
 class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
  public:
   GpuMemoryBufferImpl(const gfx::Size& size,
                       Format format,
                       scoped_ptr<base::SharedMemory> shared_memory)
       : size_(size),
         format_(format),
         shared_memory_(shared_memory.Pass()),
         mapped_(false) {}
 
   // Overridden from gfx::GpuMemoryBuffer:
   void* Map() override {
     DCHECK(!mapped_);
-    if (!shared_memory_->Map(size_.GetArea() * BytesPerPixel(format_)))
+    if (!shared_memory_->Map(PixelsToBytes(size_.GetArea(), format_)))
       return NULL;
     mapped_ = true;
     return shared_memory_->memory();
   }
   void Unmap() override {
     DCHECK(mapped_);
     shared_memory_->Unmap();
     mapped_ = false;
   }
   bool IsMapped() const override { return mapped_; }
   Format GetFormat() const override { return format_; }
   uint32 GetStride() const override {
-    return size_.width() * BytesPerPixel(format_);
+    return PixelsToBytes(size_.width(), format_);
   }
   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);
   }
@@ skipping 12 matching lines @@
 
 TestGpuMemoryBufferManager::~TestGpuMemoryBufferManager() {
 }
 
 scoped_ptr<gfx::GpuMemoryBuffer>
 TestGpuMemoryBufferManager::AllocateGpuMemoryBuffer(
     const gfx::Size& size,
     gfx::GpuMemoryBuffer::Format format,
     gfx::GpuMemoryBuffer::Usage usage) {
   scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory);
-  if (!shared_memory->CreateAnonymous(size.GetArea() * BytesPerPixel(format)))
+  if (!shared_memory->CreateAnonymous(PixelsToBytes(size.GetArea(), format)))
     return nullptr;
   return make_scoped_ptr<gfx::GpuMemoryBuffer>(
       new GpuMemoryBufferImpl(size, format, shared_memory.Pass()));
 }
 
 gfx::GpuMemoryBuffer*
 TestGpuMemoryBufferManager::GpuMemoryBufferFromClientBuffer(
     ClientBuffer buffer) {
   return reinterpret_cast<gfx::GpuMemoryBuffer*>(buffer);
 }
 
 void TestGpuMemoryBufferManager::SetDestructionSyncPoint(
     gfx::GpuMemoryBuffer* buffer,
     uint32 sync_point) {
 }
 
 }  // namespace cc