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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/view_manager/gles2/mojo_gpu_memory_buffer.h"
#include "base/logging.h"
#include "base/memory/shared_memory.h"
#include "base/numerics/safe_conversions.h"
namespace gles2 {
namespace {
int NumberOfPlanesForGpuMemoryBufferFormat(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::RGBX_8888:
case gfx::BufferFormat::BGRA_8888:
return 1;
case gfx::BufferFormat::YUV_420:
return 3;
}
NOTREACHED();
return 0;
}
size_t SubsamplingFactor(gfx::BufferFormat format, int plane) {
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::RGBX_8888:
case gfx::BufferFormat::BGRA_8888:
return 1;
case gfx::BufferFormat::YUV_420: {
static size_t factor[] = {1, 2, 2};
DCHECK_LT(static_cast<size_t>(plane), arraysize(factor));
return factor[plane];
}
}
NOTREACHED();
return 0;
}
size_t StrideInBytes(size_t width, gfx::BufferFormat format, int plane) {
switch (format) {
case gfx::BufferFormat::ATCIA:
case gfx::BufferFormat::DXT5:
DCHECK_EQ(plane, 0);
return width;
case gfx::BufferFormat::ATC:
case gfx::BufferFormat::DXT1:
case gfx::BufferFormat::ETC1:
DCHECK_EQ(plane, 0);
DCHECK_EQ(width % 2, 0u);
return width / 2;
case gfx::BufferFormat::R_8:
return (width + 3) & ~0x3;
case gfx::BufferFormat::RGBA_4444:
DCHECK_EQ(plane, 0);
return width * 2;
case gfx::BufferFormat::RGBA_8888:
case gfx::BufferFormat::RGBX_8888:
case gfx::BufferFormat::BGRA_8888:
DCHECK_EQ(plane, 0);
return width * 4;
case gfx::BufferFormat::YUV_420:
return width / SubsamplingFactor(format, plane);
}
NOTREACHED();
return 0;
}
size_t BufferSizeInBytes(const gfx::Size& size, gfx::BufferFormat format) {
size_t size_in_bytes = 0;
int num_planes = NumberOfPlanesForGpuMemoryBufferFormat(format);
for (int i = 0; i < num_planes; ++i) {
size_in_bytes += StrideInBytes(size.width(), format, i) *
(size.height() / SubsamplingFactor(format, i));
}
return size_in_bytes;
}
} // namespace
MojoGpuMemoryBufferImpl::MojoGpuMemoryBufferImpl(
const gfx::Size& size,
gfx::BufferFormat format,
scoped_ptr<base::SharedMemory> shared_memory)
: size_(size),
format_(format),
shared_memory_(shared_memory.Pass()),
mapped_(false) {}
MojoGpuMemoryBufferImpl::~MojoGpuMemoryBufferImpl() {
}
scoped_ptr<gfx::GpuMemoryBuffer> MojoGpuMemoryBufferImpl::Create(
const gfx::Size& size,
gfx::BufferFormat format,
gfx::BufferUsage usage) {
size_t bytes = BufferSizeInBytes(size, format);
scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory);
if (!shared_memory->CreateAnonymous(bytes))
return nullptr;
return make_scoped_ptr<gfx::GpuMemoryBuffer>(
new MojoGpuMemoryBufferImpl(size, format, shared_memory.Pass()));
}
MojoGpuMemoryBufferImpl* MojoGpuMemoryBufferImpl::FromClientBuffer(
ClientBuffer buffer) {
return reinterpret_cast<MojoGpuMemoryBufferImpl*>(buffer);
}
bool MojoGpuMemoryBufferImpl::Map(void** data) {
DCHECK(!mapped_);
if (!shared_memory_->Map(BufferSizeInBytes(size_, format_)))
return false;
mapped_ = true;
size_t offset = 0;
int num_planes = NumberOfPlanesForGpuMemoryBufferFormat(format_);
for (int i = 0; i < num_planes; ++i) {
data[i] = reinterpret_cast<uint8*>(shared_memory_->memory()) + offset;
offset += StrideInBytes(size_.width(), format_, i) *
(size_.height() / SubsamplingFactor(format_, i));
}
return true;
}
void MojoGpuMemoryBufferImpl::Unmap() {
DCHECK(mapped_);
shared_memory_->Unmap();
mapped_ = false;
}
bool MojoGpuMemoryBufferImpl::IsMapped() const {
return mapped_;
}
gfx::BufferFormat MojoGpuMemoryBufferImpl::GetFormat() const {
return format_;
}
void MojoGpuMemoryBufferImpl::GetStride(int* stride) const {
int num_planes = NumberOfPlanesForGpuMemoryBufferFormat(format_);
for (int i = 0; i < num_planes; ++i)
stride[i] =
base::checked_cast<int>(StrideInBytes(size_.width(), format_, i));
}
gfx::GpuMemoryBufferId MojoGpuMemoryBufferImpl::GetId() const {
return 0;
}
gfx::GpuMemoryBufferHandle MojoGpuMemoryBufferImpl::GetHandle() const {
gfx::GpuMemoryBufferHandle handle;
handle.type = gfx::SHARED_MEMORY_BUFFER;
handle.handle = shared_memory_->handle();
return handle;
}
ClientBuffer MojoGpuMemoryBufferImpl::AsClientBuffer() {
return reinterpret_cast<ClientBuffer>(this);
}
} // namespace gles2
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