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// Copyright 2015 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 "components/exo/shared_memory.h"
#include <GLES2/gl2extchromium.h>
#include <stddef.h>
#include <utility>
#include "base/logging.h"
#include "base/trace_event/trace_event.h"
#include "components/exo/buffer.h"
#include "gpu/command_buffer/client/gpu_memory_buffer_manager.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "ui/aura/env.h"
#include "ui/compositor/compositor.h"
#include "ui/gfx/buffer_format_util.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/gpu_memory_buffer.h"
namespace exo {
namespace {
bool IsSupportedFormat(gfx::BufferFormat format) {
return format == gfx::BufferFormat::RGBX_8888 ||
format == gfx::BufferFormat::RGBA_8888 ||
format == gfx::BufferFormat::BGRX_8888 ||
format == gfx::BufferFormat::BGRA_8888;
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
// SharedMemory, public:
SharedMemory::SharedMemory(const base::SharedMemoryHandle& handle)
: shared_memory_(handle, true /* read-only */) {}
SharedMemory::~SharedMemory() {}
scoped_ptr<Buffer> SharedMemory::CreateBuffer(const gfx::Size& size,
gfx::BufferFormat format,
unsigned offset,
int stride) {
TRACE_EVENT2("exo", "SharedMemory::CreateBuffer", "size", size.ToString(),
"format", static_cast<int>(format));
if (!IsSupportedFormat(format)) {
DLOG(WARNING) << "Failed to create shm buffer. Unsupported format 0x"
<< static_cast<int>(format);
return nullptr;
}
if (!base::IsValueInRangeForNumericType<size_t>(stride) ||
gfx::RowSizeForBufferFormat(size.width(), format, 0) >
static_cast<size_t>(stride) ||
static_cast<size_t>(stride) & 3) {
DLOG(WARNING) << "Failed to create shm buffer. Unsupported stride "
<< stride;
return nullptr;
}
gfx::GpuMemoryBufferHandle handle;
handle.type = gfx::SHARED_MEMORY_BUFFER;
handle.handle = base::SharedMemory::DuplicateHandle(shared_memory_.handle());
handle.offset = offset;
handle.stride = stride;
scoped_ptr<gfx::GpuMemoryBuffer> gpu_memory_buffer =
aura::Env::GetInstance()
->context_factory()
->GetGpuMemoryBufferManager()
->CreateGpuMemoryBufferFromHandle(handle, size, format);
if (!gpu_memory_buffer) {
LOG(ERROR) << "Failed to create GpuMemoryBuffer from handle";
return nullptr;
}
// Zero-copy doesn't provide a benefit in the case of shared memory as an
// implicit copy is required when trying to use these buffers as zero-copy
// buffers. Making the copy explicit allows the buffer to be reused earlier.
bool use_zero_copy = false;
return make_scoped_ptr(
new Buffer(std::move(gpu_memory_buffer), GL_TEXTURE_2D,
// COMMANDS_ISSUED queries are sufficient for shared memory
// buffers as binding to texture is implemented using a call to
// glTexImage2D and the buffer can be reused as soon as that
// command has been issued.
GL_COMMANDS_ISSUED_CHROMIUM, use_zero_copy,
false /* is_overlay_candidate */));
}
} // namespace exo
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