зеркало из https://github.com/mozilla/gecko-dev.git
66 строки
2.2 KiB
C++
66 строки
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "Swizzle.h"
|
|
|
|
#include <emmintrin.h>
|
|
#include <tmmintrin.h>
|
|
|
|
namespace mozilla::gfx {
|
|
|
|
template <bool aSwapRB>
|
|
void UnpackRowRGB24(const uint8_t* aSrc, uint8_t* aDst, int32_t aLength);
|
|
|
|
template <bool aSwapRB>
|
|
void UnpackRowRGB24_SSSE3(const uint8_t* aSrc, uint8_t* aDst, int32_t aLength) {
|
|
// Because this implementation will read an additional 4 bytes of data that
|
|
// is ignored and masked over, we cannot use the accelerated version for the
|
|
// last 1-5 pixels (3-15 bytes remaining) to guarantee we don't access memory
|
|
// outside the buffer (we read in 16 byte chunks).
|
|
if (aLength < 6) {
|
|
UnpackRowRGB24<aSwapRB>(aSrc, aDst, aLength);
|
|
return;
|
|
}
|
|
|
|
// Because we are expanding, we can only process the data back to front in
|
|
// case we are performing this in place.
|
|
int32_t alignedRow = (aLength - 2) & ~3;
|
|
int32_t remainder = aLength - alignedRow;
|
|
|
|
const uint8_t* src = aSrc + alignedRow * 3;
|
|
uint8_t* dst = aDst + alignedRow * 4;
|
|
|
|
// Handle 2-5 remaining pixels.
|
|
UnpackRowRGB24<aSwapRB>(src, dst, remainder);
|
|
|
|
__m128i mask;
|
|
if (aSwapRB) {
|
|
mask = _mm_set_epi8(15, 9, 10, 11, 14, 6, 7, 8, 13, 3, 4, 5, 12, 0, 1, 2);
|
|
} else {
|
|
mask = _mm_set_epi8(15, 11, 10, 9, 14, 8, 7, 6, 13, 5, 4, 3, 12, 2, 1, 0);
|
|
}
|
|
|
|
__m128i alpha = _mm_set1_epi32(0xFF000000);
|
|
|
|
// Process all 4-pixel chunks as one vector.
|
|
src -= 4 * 3;
|
|
dst -= 4 * 4;
|
|
while (src >= aSrc) {
|
|
__m128i px = _mm_loadu_si128(reinterpret_cast<const __m128i*>(src));
|
|
px = _mm_shuffle_epi8(px, mask);
|
|
px = _mm_or_si128(px, alpha);
|
|
_mm_storeu_si128(reinterpret_cast<__m128i*>(dst), px);
|
|
src -= 4 * 3;
|
|
dst -= 4 * 4;
|
|
}
|
|
}
|
|
|
|
// Force instantiation of swizzle variants here.
|
|
template void UnpackRowRGB24_SSSE3<false>(const uint8_t*, uint8_t*, int32_t);
|
|
template void UnpackRowRGB24_SSSE3<true>(const uint8_t*, uint8_t*, int32_t);
|
|
|
|
} // namespace mozilla::gfx
|