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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "gpu/command_buffer/service/shared_memory_region_wrapper.h"
#include "base/logging.h"
#include "base/numerics/checked_math.h"
#include "base/system/sys_info.h"
#include "ui/gfx/buffer_format_util.h"
#include "ui/gfx/gpu_memory_buffer_handle.h"
namespace gpu {
namespace {
// Validate that |stride| will work for pixels with |size| and |format|.
bool ValidateStride(const gfx::Size size,
gfx::BufferFormat format,
uint32_t stride) {
if (!base::IsValueInRangeForNumericType<size_t>(stride))
return false;
// Use plane index 0 since we can't handle different plane strides anyway.
size_t alignment = gfx::RowByteAlignmentForBufferFormat(format, /*plane=*/0);
if (stride % alignment != 0)
return false;
size_t min_width_in_bytes = 0;
if (!gfx::RowSizeForBufferFormatChecked(size.width(), format, /*plane=*/0,
&min_width_in_bytes)) {
return false;
}
if (stride < min_width_in_bytes)
return false;
return true;
}
} // namespace
SharedMemoryRegionWrapper::SharedMemoryRegionWrapper() = default;
SharedMemoryRegionWrapper::SharedMemoryRegionWrapper(
SharedMemoryRegionWrapper&& other) = default;
SharedMemoryRegionWrapper& SharedMemoryRegionWrapper::operator=(
SharedMemoryRegionWrapper&& other) = default;
SharedMemoryRegionWrapper::~SharedMemoryRegionWrapper() = default;
bool SharedMemoryRegionWrapper::Initialize(
const gfx::GpuMemoryBufferHandle& handle,
const gfx::Size& size,
gfx::BufferFormat format) {
DCHECK(!mapping_.IsValid());
if (!handle.region().IsValid()) {
DLOG(ERROR) << "Invalid GMB shared memory region.";
return false;
}
if (!ValidateStride(size, format, handle.stride)) {
DLOG(ERROR) << "Invalid GMB stride.";
return false;
}
size_t buffer_size;
if (!gfx::BufferSizeForBufferFormatChecked(size, format, &buffer_size)) {
DLOG(ERROR) << "Invalid GMB size.";
return false;
}
// Minimize the amount of address space we use but make sure offset is a
// multiple of page size as required by MapAt().
// TODO(sunnyps): This doesn't seem to be a requirement of MapAt() anymore.
const size_t allocation_granularity =
base::SysInfo::VMAllocationGranularity();
const size_t memory_offset = handle.offset % allocation_granularity;
const size_t map_offset =
allocation_granularity * (handle.offset / allocation_granularity);
base::CheckedNumeric<size_t> checked_size = buffer_size;
checked_size += memory_offset;
if (!checked_size.IsValid()) {
DLOG(ERROR) << "Invalid shared memory region map size.";
return false;
}
const size_t map_size = checked_size.ValueOrDie();
mapping_ = handle.region().MapAt(static_cast<off_t>(map_offset), map_size);
if (!mapping_.IsValid()) {
DLOG(ERROR) << "Failed to map shared memory.";
return false;
}
size_t num_planes = gfx::NumberOfPlanesForLinearBufferFormat(format);
planes_.resize(num_planes);
// The offset/stride only make sense when GpuMemoryBufferHandle is for a
// single plane. Stride should be set as the expected stride for first plane
// and offset should always be zero.
DCHECK_EQ(static_cast<size_t>(handle.stride),
gfx::RowSizeForBufferFormat(size.width(), format, /*plane=*/0));
DCHECK_EQ(handle.offset, 0u);
for (size_t plane_index = 0; plane_index < num_planes; ++plane_index) {
const size_t plane_offset =
gfx::BufferOffsetForBufferFormat(size, format, plane_index);
planes_[plane_index].offset = memory_offset + plane_offset;
planes_[plane_index].stride =
gfx::RowSizeForBufferFormat(size.width(), format, plane_index);
}
return true;
}
bool SharedMemoryRegionWrapper::IsValid() const {
return mapping_.IsValid();
}
const uint8_t* SharedMemoryRegionWrapper::GetMemory(int plane_index) const {
DCHECK(IsValid());
return mapping_.GetMemoryAs<const uint8_t>() + planes_[plane_index].offset;
}
size_t SharedMemoryRegionWrapper::GetStride(int plane_index) const {
DCHECK(IsValid());
return planes_[plane_index].stride;
}
base::span<const uint8_t> SharedMemoryRegionWrapper::GetMemoryPlanes() const {
DCHECK(IsValid());
auto full_mapped_span =
base::span(mapping_.GetMemoryAs<const uint8_t>(), mapping_.mapped_size());
// It is possible that the first plane starts at a non-zero offset. So we
// subspan at this offset.
return full_mapped_span.subspan(planes_[0].offset);
}
SkPixmap SharedMemoryRegionWrapper::MakePixmapForPlane(const SkImageInfo& info,
int plane_index) const {
DCHECK(IsValid());
SkPixmap pixmap(info, GetMemory(plane_index), GetStride(plane_index));
DCHECK_LE(planes_[plane_index].offset + pixmap.computeByteSize(),
mapping_.mapped_size());
return pixmap;
}
const base::UnguessableToken& SharedMemoryRegionWrapper::GetMappingGuid()
const {
return mapping_.guid();
}
} // namespace gpu
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