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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++ // Qt-Security score:significant reason:default
++
++ #include <qimage.h>
++ #include <private/qimage_p.h>
++ #include <private/qsimd_p.h>
++
++ #ifdef QT_COMPILER_SUPPORTS_SSSE3
++
++ QT_BEGIN_NAMESPACE
++
++ // Convert a scanline of RGB888 (src) to RGB32 (dst)
++ // src must be at least len * 3 bytes
++ // dst must be at least len * 4 bytes
++ Q_GUI_EXPORT void QT_FASTCALL qt_convert_rgb888_to_rgb32_ssse3(quint32 *dst, const uchar *src, int len)
++ {
++ int i = 0;
++
++ // Prologue, align dst to 16 bytes.
++ ALIGNMENT_PROLOGUE_16BYTES(dst, i, len) {
++ dst[i] = qRgb(src[0], src[1], src[2]);
++ src += 3;
++ }
++
++ // Mask the 4 first colors of the RGB888 vector
++ const __m128i shuffleMask = _mm_set_epi8(char(0xff), 9, 10, 11, char(0xff), 6, 7, 8, char(0xff), 3, 4, 5, char(0xff), 0, 1, 2);
++
++ // Mask the 4 last colors of a RGB888 vector with an offset of 1 (so the last 3 bytes are RGB)
++ const __m128i shuffleMaskEnd = _mm_set_epi8(char(0xff), 13, 14, 15, char(0xff), 10, 11, 12, char(0xff), 7, 8, 9, char(0xff), 4, 5, 6);
++
++ // Mask to have alpha = 0xff
++ const __m128i alphaMask = _mm_set1_epi32(0xff000000);
++
++ const __m128i *inVectorPtr = (const __m128i *)src;
++ __m128i *dstVectorPtr = (__m128i *)(dst + i);
++
++ for (; i < (len - 15); i += 16) { // one iteration in the loop converts 16 pixels
++ /*
++ RGB888 has 5 pixels per vector, + 1 byte from the next pixel. The idea here is
++ to load vectors of RGB888 and use palignr to select a vector out of two vectors.
++
++ After 3 loads of RGB888 and 3 stores of RGB32, we have 4 pixels left in the last
++ vector of RGB888, we can mask it directly to get a last store or RGB32. After that,
++ the first next byte is a R, and we can loop for the next 16 pixels.
++
++ The conversion itself is done with a byte permutation (pshufb).
++ */
++ __m128i firstSrcVector = _mm_lddqu_si128(inVectorPtr);
++ __m128i outputVector = _mm_shuffle_epi8(firstSrcVector, shuffleMask);
++ _mm_store_si128(dstVectorPtr, _mm_or_si128(outputVector, alphaMask));
++ ++inVectorPtr;
++ ++dstVectorPtr;
++
++ // There are 4 unused bytes left in srcVector, we need to load the next 16 bytes
++ // and load the next input with palignr
++ __m128i secondSrcVector = _mm_lddqu_si128(inVectorPtr);
++ __m128i srcVector = _mm_alignr_epi8(secondSrcVector, firstSrcVector, 12);
++ outputVector = _mm_shuffle_epi8(srcVector, shuffleMask);
++ _mm_store_si128(dstVectorPtr, _mm_or_si128(outputVector, alphaMask));
++ ++inVectorPtr;
++ ++dstVectorPtr;
++ firstSrcVector = secondSrcVector;
++
++ // We now have 8 unused bytes left in firstSrcVector
++ secondSrcVector = _mm_lddqu_si128(inVectorPtr);
++ srcVector = _mm_alignr_epi8(secondSrcVector, firstSrcVector, 8);
++ outputVector = _mm_shuffle_epi8(srcVector, shuffleMask);
++ _mm_store_si128(dstVectorPtr, _mm_or_si128(outputVector, alphaMask));
++ ++inVectorPtr;
++ ++dstVectorPtr;
++
++ // There are now 12 unused bytes in firstSrcVector.
++ // We can mask them directly, almost there.
++ outputVector = _mm_shuffle_epi8(secondSrcVector, shuffleMaskEnd);
++ _mm_store_si128(dstVectorPtr, _mm_or_si128(outputVector, alphaMask));
++ ++dstVectorPtr;
++ }
++ src = (const uchar *)inVectorPtr;
++
++ SIMD_EPILOGUE(i, len, 15) {
++ dst[i] = qRgb(src[0], src[1], src[2]);
++ src += 3;
++ }
++ }
++
++ void convert_RGB888_to_RGB32_ssse3(QImageData *dest, const QImageData *src, Qt::ImageConversionFlags)
++ {
++ Q_ASSERT(src->format == QImage::Format_RGB888 || src->format == QImage::Format_BGR888);
++ if (src->format == QImage::Format_BGR888)
++ Q_ASSERT(dest->format == QImage::Format_RGBX8888 || dest->format == QImage::Format_RGBA8888 || dest->format == QImage::Format_RGBA8888_Premultiplied);
++ else
++ Q_ASSERT(dest->format == QImage::Format_RGB32 || dest->format == QImage::Format_ARGB32 || dest->format == QImage::Format_ARGB32_Premultiplied);
++ Q_ASSERT(src->width == dest->width);
++ Q_ASSERT(src->height == dest->height);
++
++ const uchar *src_data = (uchar *) src->data;
++ quint32 *dest_data = (quint32 *) dest->data;
++
++ for (int i = 0; i < src->height; ++i) {
++ qt_convert_rgb888_to_rgb32_ssse3(dest_data, src_data, src->width);
++ src_data += src->bytes_per_line;
++ dest_data = (quint32 *)((uchar*)dest_data + dest->bytes_per_line);
++ }
++ }
++
++ QT_END_NAMESPACE
++
++ #endif // QT_COMPILER_SUPPORTS_SSSE3