1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
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.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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
|
