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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.
#include "gpu/command_buffer/service/shared_memory_region_wrapper.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/numerics/checked_math.h"
#include "base/system/sys_info.h"
#include "components/viz/common/resources/shared_image_format_utils.h"
#include "ui/gfx/gpu_memory_buffer_handle.h"
namespace gpu {
namespace {
size_t RowByteAlignmentForSharedImageFormatFirstPlane(
viz::SharedImageFormat format) {
CHECK(viz::HasEquivalentBufferFormat(format));
if (format == viz::SinglePlaneFormat::kRGBA_F16) {
return 8;
}
if (format.is_single_plane()) {
return 4;
}
return format.MultiplanarStorageBytesPerChannel();
}
// Validate that |stride| will work for pixels with |size| and |format|.
bool ValidateStride(const gfx::Size size,
viz::SharedImageFormat format,
uint32_t stride) {
if (!base::IsValueInRangeForNumericType<size_t>(stride))
return false;
// Check for first plane index since we can't handle different plane strides
// anyway.
size_t alignment = RowByteAlignmentForSharedImageFormatFirstPlane(format);
if (stride % alignment != 0)
return false;
std::optional<size_t> min_width_in_bytes =
viz::SharedMemoryRowSizeForSharedImageFormat(format, /*plane=*/0,
size.width());
if (!min_width_in_bytes) {
return false;
}
if (stride < min_width_in_bytes.value()) {
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,
viz::SharedImageFormat format) {
DCHECK(!mapping_.IsValid());
CHECK(viz::HasEquivalentBufferFormat(format));
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;
}
std::optional<size_t> buffer_size =
viz::SharedMemorySizeForSharedImageFormat(format, size);
if (!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.value();
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;
}
int num_planes = format.NumberOfPlanes();
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),
viz::SharedMemoryRowSizeForSharedImageFormat(format, /*plane=*/0,
size.width())
.value());
DCHECK_EQ(handle.offset, 0u);
for (int plane_index = 0; plane_index < num_planes; ++plane_index) {
const size_t plane_offset =
viz::SharedMemoryOffsetForSharedImageFormat(format, plane_index, size);
planes_[plane_index].offset = memory_offset + plane_offset;
planes_[plane_index].stride = viz::SharedMemoryRowSizeForSharedImageFormat(
format, plane_index, size.width())
.value();
}
return true;
}
bool SharedMemoryRegionWrapper::IsValid() const {
return mapping_.IsValid();
}
const uint8_t* SharedMemoryRegionWrapper::GetMemory(int plane_index) const {
DCHECK(IsValid());
return UNSAFE_TODO(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 = UNSAFE_TODO(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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