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// Copyright 2015 The Chromium Authors
// 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 "components/viz/common/resources/resource_sizes.h"
#include "components/viz/common/resources/shared_image_format_utils.h"
#include "third_party/khronos/GLES2/gl2.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_handle.h"
namespace exo {
namespace {
bool IsSupportedFormat(viz::SharedImageFormat format) {
return format == viz::SinglePlaneFormat::kRGBX_8888 ||
format == viz::SinglePlaneFormat::kRGBA_8888 ||
format == viz::SinglePlaneFormat::kBGRX_8888 ||
format == viz::SinglePlaneFormat::kBGRA_8888;
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
// SharedMemory, public:
SharedMemory::SharedMemory(base::UnsafeSharedMemoryRegion shared_memory_region)
: shared_memory_region_(std::move(shared_memory_region)) {}
SharedMemory::~SharedMemory() = default;
std::unique_ptr<Buffer> SharedMemory::CreateBuffer(
const gfx::Size& size,
viz::SharedImageFormat format,
unsigned offset,
uint32_t stride) {
TRACE_EVENT2("exo", "SharedMemory::CreateBuffer", "size", size.ToString(),
"format", format.ToString());
if (!IsSupportedFormat(format)) {
DLOG(WARNING) << "Failed to create shm buffer. Unsupported format "
<< format.ToString();
return nullptr;
}
size_t bytes_per_row =
viz::ResourceSizes::CheckedWidthInBytes<size_t>(size.width(), format);
if (bytes_per_row > stride || stride & 3) {
DLOG(WARNING) << "Failed to create shm buffer. Unsupported stride "
<< stride;
return nullptr;
}
gfx::GpuMemoryBufferHandle handle(shared_memory_region_.Duplicate());
handle.offset = offset;
handle.stride = stride;
const gfx::BufferUsage buffer_usage = gfx::BufferUsage::GPU_READ;
// 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.
const unsigned query_type = GL_COMMANDS_ISSUED_CHROMIUM;
// 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.
const bool use_zero_copy = false;
const bool is_overlay_candidate = false;
const bool y_invert = false;
return Buffer::CreateBufferFromGMBHandle(
std::move(handle), size, format, buffer_usage, query_type, use_zero_copy,
is_overlay_candidate, y_invert);
}
size_t SharedMemory::GetSize() const {
return shared_memory_region_.GetSize();
}
bool SharedMemory::Resize(const size_t new_size) {
// The following code is to replace |shared_memory_region_| with an identical
// UnsafeSharedMemoryRegion with a new size.
base::subtle::PlatformSharedMemoryRegion platform_region =
base::UnsafeSharedMemoryRegion::TakeHandleForSerialization(
std::move(shared_memory_region_));
base::UnguessableToken guid = platform_region.GetGUID();
base::subtle::PlatformSharedMemoryRegion updated_platform_region =
base::subtle::PlatformSharedMemoryRegion::Take(
platform_region.PassPlatformHandle(),
base::subtle::PlatformSharedMemoryRegion::Mode::kUnsafe, new_size,
guid);
shared_memory_region_ = base::UnsafeSharedMemoryRegion::Deserialize(
std::move(updated_platform_region));
return shared_memory_region_.IsValid();
}
} // namespace exo
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