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// Copyright 2022 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_image/gl_repack_utils.h"
#include <vector>
#include "base/bits.h"
#include "base/check_op.h"
#include "base/compiler_specific.h"
#include "gpu/command_buffer/service/shared_image/copy_image_plane.h"
#include "third_party/skia/include/core/SkPixmap.h"
namespace gpu {
std::vector<uint8_t> RepackPixelDataAsRgb(const gfx::Size& size,
const SkPixmap& src_pixmap,
bool src_is_bgrx) {
DCHECK_EQ(src_pixmap.info().bytesPerPixel(), 4);
constexpr size_t kSrcBytesPerPixel = 4;
constexpr size_t kDstBytesPerPixel = 3;
const uint8_t* src_data = static_cast<const uint8_t*>(src_pixmap.addr());
size_t src_stride = src_pixmap.rowBytes();
// 3 bytes per pixel with 4 byte row alignment.
size_t dst_stride =
base::bits::AlignUp<size_t>(size.width() * kDstBytesPerPixel, 4);
std::vector<uint8_t> dst_data(dst_stride * size.height());
for (int y = 0; y < size.height(); ++y) {
for (int x = 0; x < size.width(); ++x) {
auto* src =
&UNSAFE_TODO(src_data[y * src_stride + x * kSrcBytesPerPixel]);
auto* dst = &dst_data[y * dst_stride + x * kDstBytesPerPixel];
if (src_is_bgrx) {
dst[0] = UNSAFE_TODO(src[2]);
UNSAFE_TODO(dst[1]) = UNSAFE_TODO(src[1]);
UNSAFE_TODO(dst[2]) = src[0];
} else {
dst[0] = src[0];
UNSAFE_TODO(dst[1]) = UNSAFE_TODO(src[1]);
UNSAFE_TODO(dst[2]) = UNSAFE_TODO(src[2]);
}
}
}
return dst_data;
}
std::vector<uint8_t> RepackPixelDataWithStride(const gfx::Size& size,
const SkPixmap& src_pixmap,
size_t dst_stride) {
const uint8_t* src_data = static_cast<const uint8_t*>(src_pixmap.addr());
size_t src_stride = src_pixmap.rowBytes();
DCHECK_LT(dst_stride, src_stride);
std::vector<uint8_t> dst_data(dst_stride * size.height());
CopyImagePlane(src_data, src_stride, dst_data.data(), dst_stride,
src_pixmap.info().minRowBytes(), size.height());
return dst_data;
}
void UnpackPixelDataWithStride(const gfx::Size& size,
const std::vector<uint8_t>& src_data,
size_t src_stride,
const SkPixmap& dst_pixmap) {
uint8_t* dst_data = static_cast<uint8_t*>(dst_pixmap.writable_addr());
size_t dst_stride = dst_pixmap.rowBytes();
DCHECK_GT(dst_stride, src_stride);
CopyImagePlane(src_data.data(), src_stride, dst_data, dst_stride,
dst_pixmap.info().minRowBytes(), size.height());
}
void SwizzleRedAndBlue(const SkPixmap& pixmap) {
DCHECK_EQ(pixmap.info().bytesPerPixel(), 4);
uint8_t* data = static_cast<uint8_t*>(pixmap.writable_addr());
size_t stride = pixmap.rowBytes();
for (int y = 0; y < pixmap.height(); ++y) {
size_t row_offset = y * stride;
for (int x = 0; x < pixmap.width(); ++x) {
size_t pixel_offset = row_offset + x * 4;
std::swap(UNSAFE_TODO(data[pixel_offset]),
UNSAFE_TODO(data[pixel_offset + 2]));
}
}
}
} // namespace gpu
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