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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 "content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.h"
#include "base/bind.h"
#include "base/numerics/safe_math.h"
#include "ui/gfx/buffer_format_util.h"
#include "ui/gl/gl_bindings.h"
namespace content {
GpuMemoryBufferImplSharedMemory::GpuMemoryBufferImplSharedMemory(
gfx::GpuMemoryBufferId id,
const gfx::Size& size,
gfx::BufferFormat format,
const DestructionCallback& callback,
scoped_ptr<base::SharedMemory> shared_memory)
: GpuMemoryBufferImpl(id, size, format, callback),
shared_memory_(shared_memory.Pass()) {
DCHECK(IsFormatSupported(format));
DCHECK(IsSizeValidForFormat(size, format));
}
GpuMemoryBufferImplSharedMemory::~GpuMemoryBufferImplSharedMemory() {
}
// static
scoped_ptr<GpuMemoryBufferImpl> GpuMemoryBufferImplSharedMemory::Create(
gfx::GpuMemoryBufferId id,
const gfx::Size& size,
gfx::BufferFormat format,
const DestructionCallback& callback) {
size_t buffer_size = 0u;
if (!BufferSizeInBytes(size, format, &buffer_size))
return scoped_ptr<GpuMemoryBufferImpl>();
scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory());
if (!shared_memory->CreateAndMapAnonymous(buffer_size))
return scoped_ptr<GpuMemoryBufferImpl>();
return make_scoped_ptr(new GpuMemoryBufferImplSharedMemory(
id, size, format, callback, shared_memory.Pass()));
}
// static
gfx::GpuMemoryBufferHandle
GpuMemoryBufferImplSharedMemory::AllocateForChildProcess(
gfx::GpuMemoryBufferId id,
const gfx::Size& size,
gfx::BufferFormat format,
base::ProcessHandle child_process) {
size_t buffer_size = 0u;
if (!BufferSizeInBytes(size, format, &buffer_size))
return gfx::GpuMemoryBufferHandle();
base::SharedMemory shared_memory;
if (!shared_memory.CreateAnonymous(buffer_size))
return gfx::GpuMemoryBufferHandle();
gfx::GpuMemoryBufferHandle handle;
handle.type = gfx::SHARED_MEMORY_BUFFER;
handle.id = id;
shared_memory.GiveToProcess(child_process, &handle.handle);
return handle;
}
// static
scoped_ptr<GpuMemoryBufferImpl>
GpuMemoryBufferImplSharedMemory::CreateFromHandle(
const gfx::GpuMemoryBufferHandle& handle,
const gfx::Size& size,
gfx::BufferFormat format,
const DestructionCallback& callback) {
if (!base::SharedMemory::IsHandleValid(handle.handle))
return scoped_ptr<GpuMemoryBufferImpl>();
size_t buffer_size = 0u;
if (!BufferSizeInBytes(size, format, &buffer_size))
return scoped_ptr<GpuMemoryBufferImpl>();
scoped_ptr<base::SharedMemory> shared_memory(
new base::SharedMemory(handle.handle, false));
if (!shared_memory->Map(buffer_size))
return scoped_ptr<GpuMemoryBufferImpl>();
return make_scoped_ptr<GpuMemoryBufferImpl>(
new GpuMemoryBufferImplSharedMemory(
handle.id,
size,
format,
callback,
shared_memory.Pass()));
}
// static
bool GpuMemoryBufferImplSharedMemory::IsFormatSupported(
gfx::BufferFormat format) {
switch (format) {
case gfx::BufferFormat::ATC:
case gfx::BufferFormat::ATCIA:
case gfx::BufferFormat::DXT1:
case gfx::BufferFormat::DXT5:
case gfx::BufferFormat::ETC1:
case gfx::BufferFormat::R_8:
case gfx::BufferFormat::RGBA_4444:
case gfx::BufferFormat::RGBA_8888:
case gfx::BufferFormat::BGRA_8888:
case gfx::BufferFormat::YUV_420:
return true;
case gfx::BufferFormat::RGBX_8888:
return false;
}
NOTREACHED();
return false;
}
// static
bool GpuMemoryBufferImplSharedMemory::IsUsageSupported(gfx::BufferUsage usage) {
switch (usage) {
case gfx::BufferUsage::MAP:
case gfx::BufferUsage::PERSISTENT_MAP:
return true;
case gfx::BufferUsage::SCANOUT:
return false;
}
NOTREACHED();
return false;
}
// static
bool GpuMemoryBufferImplSharedMemory::IsSizeValidForFormat(
const gfx::Size& size,
gfx::BufferFormat format) {
switch (format) {
case gfx::BufferFormat::ATC:
case gfx::BufferFormat::ATCIA:
case gfx::BufferFormat::DXT1:
case gfx::BufferFormat::DXT5:
case gfx::BufferFormat::ETC1:
// Compressed images must have a width and height that's evenly divisible
// by the block size.
return size.width() % 4 == 0 && size.height() % 4 == 0;
case gfx::BufferFormat::R_8:
case gfx::BufferFormat::RGBA_4444:
case gfx::BufferFormat::RGBA_8888:
case gfx::BufferFormat::BGRA_8888:
case gfx::BufferFormat::RGBX_8888:
return true;
case gfx::BufferFormat::YUV_420: {
size_t num_planes = gfx::NumberOfPlanesForBufferFormat(format);
for (size_t i = 0; i < num_planes; ++i) {
size_t factor = SubsamplingFactor(format, i);
if (size.width() % factor || size.height() % factor)
return false;
}
return true;
}
}
NOTREACHED();
return false;
}
bool GpuMemoryBufferImplSharedMemory::Map(void** data) {
DCHECK(!mapped_);
size_t offset = 0;
size_t num_planes = gfx::NumberOfPlanesForBufferFormat(format_);
for (size_t i = 0; i < num_planes; ++i) {
data[i] = reinterpret_cast<uint8*>(shared_memory_->memory()) + offset;
size_t row_size_in_bytes = 0;
bool valid_row_size =
RowSizeInBytes(size_.width(), format_, i, &row_size_in_bytes);
DCHECK(valid_row_size);
offset +=
row_size_in_bytes * (size_.height() / SubsamplingFactor(format_, i));
}
mapped_ = true;
return true;
}
void GpuMemoryBufferImplSharedMemory::Unmap() {
DCHECK(mapped_);
mapped_ = false;
}
void GpuMemoryBufferImplSharedMemory::GetStride(int* stride) const {
size_t num_planes = gfx::NumberOfPlanesForBufferFormat(format_);
for (size_t i = 0; i < num_planes; ++i) {
size_t row_size_in_bytes = 0;
bool valid_row_size =
RowSizeInBytes(size_.width(), format_, i, &row_size_in_bytes);
DCHECK(valid_row_size);
stride[i] = row_size_in_bytes;
}
}
gfx::GpuMemoryBufferHandle GpuMemoryBufferImplSharedMemory::GetHandle() const {
gfx::GpuMemoryBufferHandle handle;
handle.type = gfx::SHARED_MEMORY_BUFFER;
handle.id = id_;
handle.handle = shared_memory_->handle();
return handle;
}
} // namespace content
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