diff options
Diffstat (limited to 'src/gui/painting/qdrawhelper_ssse3.cpp')
| -rw-r--r-- | src/gui/painting/qdrawhelper_ssse3.cpp | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/src/gui/painting/qdrawhelper_ssse3.cpp b/src/gui/painting/qdrawhelper_ssse3.cpp new file mode 100644 index 0000000000..e392de2541 --- /dev/null +++ b/src/gui/painting/qdrawhelper_ssse3.cpp @@ -0,0 +1,183 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <private/qdrawhelper_x86_p.h> + +#ifdef QT_HAVE_SSSE3 + +#include <private/qdrawingprimitive_sse2_p.h> + +QT_BEGIN_NAMESPACE + +inline static void blend_pixel(quint32 &dst, const quint32 src) +{ + if (src >= 0xff000000) + dst = src; + else if (src != 0) + dst = src + BYTE_MUL(dst, qAlpha(~src)); +} + + +/* The instruction palignr uses direct arguments, so we have to generate the code fo the different + shift (4, 8, 12). Checking the alignment inside the loop is unfortunatelly way too slow. + */ +#define BLENDING_LOOP(palignrOffset, length)\ + for (; x < length-3; x += 4) { \ + const __m128i srcVectorLastLoaded = _mm_load_si128((__m128i *)&src[x - minusOffsetToAlignSrcOn16Bytes + 4]);\ + const __m128i srcVector = _mm_alignr_epi8(srcVectorLastLoaded, srcVectorPrevLoaded, palignrOffset); \ + const __m128i srcVectorAlpha = _mm_and_si128(srcVector, alphaMask); \ + if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, alphaMask)) == 0xffff) { \ + _mm_store_si128((__m128i *)&dst[x], srcVector); \ + } else if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, nullVector)) != 0xffff) { \ + __m128i alphaChannel = _mm_shuffle_epi8(srcVector, alphaShuffleMask); \ + alphaChannel = _mm_sub_epi16(one, alphaChannel); \ + const __m128i dstVector = _mm_load_si128((__m128i *)&dst[x]); \ + __m128i destMultipliedByOneMinusAlpha; \ + BYTE_MUL_SSE2(destMultipliedByOneMinusAlpha, dstVector, alphaChannel, colorMask, half); \ + const __m128i result = _mm_add_epi8(srcVector, destMultipliedByOneMinusAlpha); \ + _mm_store_si128((__m128i *)&dst[x], result); \ + } \ + srcVectorPrevLoaded = srcVectorLastLoaded;\ + } + + +// Basically blend src over dst with the const alpha defined as constAlphaVector. +// nullVector, half, one, colorMask are constant across the whole image/texture, and should be defined as: +//const __m128i nullVector = _mm_set1_epi32(0); +//const __m128i half = _mm_set1_epi16(0x80); +//const __m128i one = _mm_set1_epi16(0xff); +//const __m128i colorMask = _mm_set1_epi32(0x00ff00ff); +//const __m128i alphaMask = _mm_set1_epi32(0xff000000); +// +// The computation being done is: +// result = s + d * (1-alpha) +// with shortcuts if fully opaque or fully transparent. +#define BLEND_SOURCE_OVER_ARGB32_SSSE3(dst, src, length, nullVector, half, one, colorMask, alphaMask) { \ + int x = 0; \ +\ + /* First, get dst aligned. */ \ + ALIGNMENT_PROLOGUE_16BYTES(dst, x, length) { \ + blend_pixel(dst[x], src[x]); \ + } \ +\ + const int minusOffsetToAlignSrcOn16Bytes = (reinterpret_cast<quintptr>(&(src[x])) >> 2) & 0x3;\ +\ + if (!minusOffsetToAlignSrcOn16Bytes) {\ + /* src is aligned, usual algorithm but with aligned operations.\ + See the SSE2 version for more documentation on the algorithm itself. */\ + const __m128i alphaShuffleMask = _mm_set_epi8(0xff,15,0xff,15,0xff,11,0xff,11,0xff,7,0xff,7,0xff,3,0xff,3);\ + for (; x < length-3; x += 4) { \ + const __m128i srcVector = _mm_load_si128((__m128i *)&src[x]); \ + const __m128i srcVectorAlpha = _mm_and_si128(srcVector, alphaMask); \ + if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, alphaMask)) == 0xffff) { \ + _mm_store_si128((__m128i *)&dst[x], srcVector); \ + } else if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, nullVector)) != 0xffff) { \ + __m128i alphaChannel = _mm_shuffle_epi8(srcVector, alphaShuffleMask); \ + alphaChannel = _mm_sub_epi16(one, alphaChannel); \ + const __m128i dstVector = _mm_load_si128((__m128i *)&dst[x]); \ + __m128i destMultipliedByOneMinusAlpha; \ + BYTE_MUL_SSE2(destMultipliedByOneMinusAlpha, dstVector, alphaChannel, colorMask, half); \ + const __m128i result = _mm_add_epi8(srcVector, destMultipliedByOneMinusAlpha); \ + _mm_store_si128((__m128i *)&dst[x], result); \ + } \ + } /* end for() */\ + } else if ((length - x) >= 8) {\ + /* We use two vectors to extract the src: prevLoaded for the first pixels, lastLoaded for the current pixels. */\ + __m128i srcVectorPrevLoaded = _mm_load_si128((__m128i *)&src[x - minusOffsetToAlignSrcOn16Bytes]);\ + const int palignrOffset = minusOffsetToAlignSrcOn16Bytes << 2;\ +\ + const __m128i alphaShuffleMask = _mm_set_epi8(0xff,15,0xff,15,0xff,11,0xff,11,0xff,7,0xff,7,0xff,3,0xff,3);\ + switch (palignrOffset) {\ + case 4:\ + BLENDING_LOOP(4, length)\ + break;\ + case 8:\ + BLENDING_LOOP(8, length)\ + break;\ + case 12:\ + BLENDING_LOOP(12, length)\ + break;\ + }\ + }\ + for (; x < length; ++x) \ + blend_pixel(dst[x], src[x]); \ +} + +void qt_blend_argb32_on_argb32_ssse3(uchar *destPixels, int dbpl, + const uchar *srcPixels, int sbpl, + int w, int h, + int const_alpha) +{ + const quint32 *src = (const quint32 *) srcPixels; + quint32 *dst = (quint32 *) destPixels; + if (const_alpha == 256) { + const __m128i alphaMask = _mm_set1_epi32(0xff000000); + const __m128i nullVector = _mm_setzero_si128(); + const __m128i half = _mm_set1_epi16(0x80); + const __m128i one = _mm_set1_epi16(0xff); + const __m128i colorMask = _mm_set1_epi32(0x00ff00ff); + + for (int y = 0; y < h; ++y) { + BLEND_SOURCE_OVER_ARGB32_SSSE3(dst, src, w, nullVector, half, one, colorMask, alphaMask); + dst = (quint32 *)(((uchar *) dst) + dbpl); + src = (const quint32 *)(((const uchar *) src) + sbpl); + } + } else if (const_alpha != 0) { + // dest = (s + d * sia) * ca + d * cia + // = s * ca + d * (sia * ca + cia) + // = s * ca + d * (1 - sa*ca) + const_alpha = (const_alpha * 255) >> 8; + const __m128i nullVector = _mm_setzero_si128(); + const __m128i half = _mm_set1_epi16(0x80); + const __m128i one = _mm_set1_epi16(0xff); + const __m128i colorMask = _mm_set1_epi32(0x00ff00ff); + const __m128i constAlphaVector = _mm_set1_epi16(const_alpha); + for (int y = 0; y < h; ++y) { + BLEND_SOURCE_OVER_ARGB32_WITH_CONST_ALPHA_SSE2(dst, src, w, nullVector, half, one, colorMask, constAlphaVector) + dst = (quint32 *)(((uchar *) dst) + dbpl); + src = (const quint32 *)(((const uchar *) src) + sbpl); + } + } +} + +QT_END_NAMESPACE + +#endif // QT_HAVE_SSSE3 |