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| |
| #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 |