forked from mirrors/gecko-dev
cc2040bf21
Done with: ./mach static-analysis check --checks="-*, modernize-concat-nested-namespaces" --fix . and then clang-format on the files Differential Revision: https://phabricator.services.mozilla.com/D58217 --HG-- extra : moz-landing-system : lando
65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "Swizzle.h"
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#include <emmintrin.h>
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#include <tmmintrin.h>
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namespace mozilla::gfx {
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template <bool aSwapRB>
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void UnpackRowRGB24(const uint8_t* aSrc, uint8_t* aDst, int32_t aLength);
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template <bool aSwapRB>
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void UnpackRowRGB24_SSSE3(const uint8_t* aSrc, uint8_t* aDst, int32_t aLength) {
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// Because this implementation will read an additional 4 bytes of data that
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// is ignored and masked over, we cannot use the accelerated version for the
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// last 1-5 pixels (3-15 bytes remaining) to guarantee we don't access memory
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// outside the buffer (we read in 16 byte chunks).
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if (aLength < 6) {
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UnpackRowRGB24<aSwapRB>(aSrc, aDst, aLength);
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return;
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}
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// Because we are expanding, we can only process the data back to front in
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// case we are performing this in place.
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int32_t alignedRow = (aLength - 2) & ~3;
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int32_t remainder = aLength - alignedRow;
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const uint8_t* src = aSrc + alignedRow * 3;
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uint8_t* dst = aDst + alignedRow * 4;
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// Handle 2-5 remaining pixels.
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UnpackRowRGB24<aSwapRB>(src, dst, remainder);
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__m128i mask;
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if (aSwapRB) {
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mask = _mm_set_epi8(15, 9, 10, 11, 14, 6, 7, 8, 13, 3, 4, 5, 12, 0, 1, 2);
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} else {
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mask = _mm_set_epi8(15, 11, 10, 9, 14, 8, 7, 6, 13, 5, 4, 3, 12, 2, 1, 0);
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}
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__m128i alpha = _mm_set1_epi32(0xFF000000);
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// Process all 4-pixel chunks as one vector.
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src -= 4 * 3;
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dst -= 4 * 4;
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while (src >= aSrc) {
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__m128i px = _mm_loadu_si128(reinterpret_cast<const __m128i*>(src));
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px = _mm_shuffle_epi8(px, mask);
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px = _mm_or_si128(px, alpha);
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_mm_storeu_si128(reinterpret_cast<__m128i*>(dst), px);
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src -= 4 * 3;
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dst -= 4 * 4;
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}
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}
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// Force instantiation of swizzle variants here.
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template void UnpackRowRGB24_SSSE3<false>(const uint8_t*, uint8_t*, int32_t);
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template void UnpackRowRGB24_SSSE3<true>(const uint8_t*, uint8_t*, int32_t);
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} // namespace mozilla::gfx
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