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// 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 "ui/gl/gl_image_shared_memory.h"
#include "base/logging.h"
#include "base/numerics/safe_math.h"
#include "base/process/process_handle.h"
namespace gfx {
namespace {
// Returns true if the size is valid and false otherwise.
bool SizeInBytes(const gfx::Size& size,
gfx::GpuMemoryBuffer::Format format,
size_t* size_in_bytes) {
if (size.IsEmpty())
return false;
base::CheckedNumeric<size_t> s = GLImageMemory::BytesPerPixel(format);
s *= size.width();
s *= size.height();
if (!s.IsValid())
return false;
*size_in_bytes = s.ValueOrDie();
return true;
}
} // namespace
GLImageSharedMemory::GLImageSharedMemory(const gfx::Size& size,
unsigned internalformat)
: GLImageMemory(size, internalformat) {
}
GLImageSharedMemory::~GLImageSharedMemory() {
DCHECK(!shared_memory_);
}
bool GLImageSharedMemory::Initialize(const gfx::GpuMemoryBufferHandle& handle,
gfx::GpuMemoryBuffer::Format format) {
size_t size_in_bytes;
if (!SizeInBytes(GetSize(), format, &size_in_bytes))
return false;
if (!base::SharedMemory::IsHandleValid(handle.handle))
return false;
base::SharedMemory shared_memory(handle.handle, true);
// Duplicate the handle.
base::SharedMemoryHandle duped_shared_memory_handle;
if (!shared_memory.ShareToProcess(base::GetCurrentProcessHandle(),
&duped_shared_memory_handle)) {
DVLOG(0) << "Failed to duplicate shared memory handle.";
return false;
}
scoped_ptr<base::SharedMemory> duped_shared_memory(
new base::SharedMemory(duped_shared_memory_handle, true));
if (!duped_shared_memory->Map(size_in_bytes)) {
DVLOG(0) << "Failed to map shared memory.";
return false;
}
if (!GLImageMemory::Initialize(
static_cast<unsigned char*>(duped_shared_memory->memory()), format)) {
return false;
}
DCHECK(!shared_memory_);
shared_memory_ = duped_shared_memory.Pass();
return true;
}
void GLImageSharedMemory::Destroy(bool have_context) {
GLImageMemory::Destroy(have_context);
shared_memory_.reset();
}
} // namespace gfx
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