qt-everywhere-src-5.15.1/qtmultimedia/src/multimedia/video/qvideoframeconversionhelper_sse2.cpp

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#include "qvideoframeconversionhelper_p.h"

#ifdef QT_COMPILER_SUPPORTS_SSE2

QT_BEGIN_NAMESPACE

void QT_FASTCALL qt_convert_BGRA32_to_ARGB32_sse2(const QVideoFrame &frame, uchar *output)
{
    FETCH_INFO_PACKED(frame)
    MERGE_LOOPS(width, height, stride, 4)
    quint32 *argb = reinterpret_cast<quint32*>(output);

    const __m128i zero = _mm_setzero_si128();

    for (int y = 0; y < height; ++y) {
        const quint32 *bgra = reinterpret_cast<const quint32*>(src);

        int x = 0;
        ALIGN(16, argb, x, width) {
            *argb = qConvertBGRA32ToARGB32(*bgra);
            ++bgra;
            ++argb;
        }

        for (; x < width - 3; x += 4) {
            __m128i pixelData = _mm_loadu_si128(reinterpret_cast<const __m128i*>(bgra));
            bgra += 4;
            __m128i gaComponents = _mm_unpacklo_epi8(pixelData, zero);
            __m128i brComponents = _mm_unpackhi_epi8(pixelData, zero);
            gaComponents = _mm_shufflelo_epi16(_mm_shufflehi_epi16(gaComponents, _MM_SHUFFLE(0, 1, 2, 3)), _MM_SHUFFLE(0, 1, 2, 3)); // swap GA
            brComponents = _mm_shufflelo_epi16(_mm_shufflehi_epi16(brComponents, _MM_SHUFFLE(0, 1, 2, 3)), _MM_SHUFFLE(0, 1, 2, 3)); // swap BR
            pixelData = _mm_packus_epi16(gaComponents, brComponents);
            _mm_store_si128(reinterpret_cast<__m128i*>(argb), pixelData);
            argb += 4;
        }

        // leftovers
        for (; x < width; ++x) {
            *argb = qConvertBGRA32ToARGB32(*bgra);
            ++bgra;
            ++argb;
        }

        src += stride;
    }
}

QT_END_NAMESPACE

#endif