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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
diff --git a/gfx/skia/src/effects/SkGradientShader.cpp b/gfx/skia/src/effects/SkGradientShader.cpp
--- a/gfx/skia/src/effects/SkGradientShader.cpp
+++ b/gfx/skia/src/effects/SkGradientShader.cpp
@@ -167,16 +167,17 @@ private:
mutable uint16_t* fCache16; // working ptr. If this is NULL, we need to recompute the cache values
mutable SkPMColor* fCache32; // working ptr. If this is NULL, we need to recompute the cache values
mutable uint16_t* fCache16Storage; // storage for fCache16, allocated on demand
mutable SkMallocPixelRef* fCache32PixelRef;
mutable unsigned fCacheAlpha; // the alpha value we used when we computed the cache. larger than 8bits so we can store uninitialized value
+ static SkPMColor PremultiplyColor(SkColor c0, U8CPU alpha);
static void Build16bitCache(uint16_t[], SkColor c0, SkColor c1, int count);
static void Build32bitCache(SkPMColor[], SkColor c0, SkColor c1, int count,
U8CPU alpha);
void setCacheAlpha(U8CPU alpha) const;
void initCommon();
typedef SkShader INHERITED;
};
@@ -512,16 +513,31 @@ static inline U8CPU dither_fixed_to_8(Sk
* For dithering with premultiply, we want to ceiling the alpha component,
* to ensure that it is always >= any color component.
*/
static inline U8CPU dither_ceil_fixed_to_8(SkFixed n) {
n >>= 8;
return ((n << 1) - (n | (n >> 8))) >> 8;
}
+SkPMColor Gradient_Shader::PremultiplyColor(SkColor c0, U8CPU paintAlpha)
+{
+ SkFixed a = SkMulDiv255Round(SkColorGetA(c0), paintAlpha);
+ SkFixed r = SkColorGetR(c0);
+ SkFixed g = SkColorGetG(c0);
+ SkFixed b = SkColorGetB(c0);
+
+ a = SkIntToFixed(a) + 0x8000;
+ r = SkIntToFixed(r) + 0x8000;
+ g = SkIntToFixed(g) + 0x8000;
+ b = SkIntToFixed(b) + 0x8000;
+
+ return SkPremultiplyARGBInline(a >> 16, r >> 16, g >> 16, b >> 16);
+}
+
void Gradient_Shader::Build32bitCache(SkPMColor cache[], SkColor c0, SkColor c1,
int count, U8CPU paintAlpha) {
SkASSERT(count > 1);
// need to apply paintAlpha to our two endpoints
SkFixed a = SkMulDiv255Round(SkColorGetA(c0), paintAlpha);
SkFixed da;
{
@@ -613,24 +629,24 @@ const uint16_t* Gradient_Shader::getCach
}
}
return fCache16;
}
const SkPMColor* Gradient_Shader::getCache32() const {
if (fCache32 == NULL) {
// double the count for dither entries
- const int entryCount = kCache32Count * 2;
+ const int entryCount = kCache32Count * 2 + 2;
const size_t allocSize = sizeof(SkPMColor) * entryCount;
if (NULL == fCache32PixelRef) {
fCache32PixelRef = SkNEW_ARGS(SkMallocPixelRef,
(NULL, allocSize, NULL));
}
- fCache32 = (SkPMColor*)fCache32PixelRef->getAddr();
+ fCache32 = (SkPMColor*)fCache32PixelRef->getAddr() + 1;
if (fColorCount == 2) {
Build32bitCache(fCache32, fOrigColors[0], fOrigColors[1],
kCache32Count, fCacheAlpha);
} else {
Rec* rec = fRecs;
int prevIndex = 0;
for (int i = 1; i < fColorCount; i++) {
int nextIndex = SkFixedToFFFF(rec[i].fPos) >> (16 - kCache32Bits);
@@ -644,28 +660,31 @@ const SkPMColor* Gradient_Shader::getCac
}
SkASSERT(prevIndex == kCache32Count - 1);
}
if (fMapper) {
SkMallocPixelRef* newPR = SkNEW_ARGS(SkMallocPixelRef,
(NULL, allocSize, NULL));
SkPMColor* linear = fCache32; // just computed linear data
- SkPMColor* mapped = (SkPMColor*)newPR->getAddr(); // storage for mapped data
+ SkPMColor* mapped = (SkPMColor*)newPR->getAddr() + 1; // storage for mapped data
SkUnitMapper* map = fMapper;
for (int i = 0; i < kCache32Count; i++) {
int index = map->mapUnit16((i << 8) | i) >> 8;
mapped[i] = linear[index];
mapped[i + kCache32Count] = linear[index + kCache32Count];
}
fCache32PixelRef->unref();
fCache32PixelRef = newPR;
- fCache32 = (SkPMColor*)newPR->getAddr();
+ fCache32 = (SkPMColor*)newPR->getAddr() + 1;
}
}
+ //Write the clamp colours into the first and last entries of fCache32
+ fCache32[-1] = PremultiplyColor(fOrigColors[0], fCacheAlpha);
+ fCache32[kCache32Count * 2] = PremultiplyColor(fOrigColors[fColorCount - 1], fCacheAlpha);
return fCache32;
}
/*
* Because our caller might rebuild the same (logically the same) gradient
* over and over, we'd like to return exactly the same "bitmap" if possible,
* allowing the client to utilize a cache of our bitmap (e.g. with a GPU).
* To do that, we maintain a private cache of built-bitmaps, based on our
@@ -875,28 +894,38 @@ void Linear_Gradient::shadeSpan(int x, i
dx = dxStorage[0];
} else {
SkASSERT(fDstToIndexClass == kLinear_MatrixClass);
dx = SkScalarToFixed(fDstToIndex.getScaleX());
}
if (SkFixedNearlyZero(dx)) {
// we're a vertical gradient, so no change in a span
- unsigned fi = proc(fx) >> (16 - kCache32Bits);
- sk_memset32_dither(dstC, cache[toggle + fi],
- cache[(toggle ^ TOGGLE_MASK) + fi], count);
+ if (proc == clamp_tileproc) {
+ if (fx < 0) {
+ sk_memset32(dstC, cache[-1], count);
+ } else if (fx > 0xFFFF) {
+ sk_memset32(dstC, cache[kCache32Count * 2], count);
+ } else {
+ unsigned fi = proc(fx) >> (16 - kCache32Bits);
+ sk_memset32_dither(dstC, cache[toggle + fi],
+ cache[(toggle ^ TOGGLE_MASK) + fi], count);
+ }
+ } else {
+ unsigned fi = proc(fx) >> (16 - kCache32Bits);
+ sk_memset32_dither(dstC, cache[toggle + fi],
+ cache[(toggle ^ TOGGLE_MASK) + fi], count);
+ }
} else if (proc == clamp_tileproc) {
SkClampRange range;
- range.init(fx, dx, count, 0, 0xFF);
+ range.init(fx, dx, count, cache[-1], cache[kCache32Count * 2]);
if ((count = range.fCount0) > 0) {
- sk_memset32_dither(dstC,
- cache[toggle + range.fV0],
- cache[(toggle ^ TOGGLE_MASK) + range.fV0],
- count);
+ // Do we really want to dither the clamp values?
+ sk_memset32(dstC, range.fV0, count);
dstC += count;
}
if ((count = range.fCount1) > 0) {
int unroll = count >> 3;
fx = range.fFx1;
for (int i = 0; i < unroll; i++) {
NO_CHECK_ITER; NO_CHECK_ITER;
NO_CHECK_ITER; NO_CHECK_ITER;
@@ -905,20 +934,17 @@ void Linear_Gradient::shadeSpan(int x, i
}
if ((count &= 7) > 0) {
do {
NO_CHECK_ITER;
} while (--count != 0);
}
}
if ((count = range.fCount2) > 0) {
- sk_memset32_dither(dstC,
- cache[toggle + range.fV1],
- cache[(toggle ^ TOGGLE_MASK) + range.fV1],
- count);
+ sk_memset32(dstC, range.fV1, count);
}
} else if (proc == mirror_tileproc) {
do {
unsigned fi = mirror_8bits(fx >> 8);
SkASSERT(fi <= 0xFF);
fx += dx;
*dstC++ = cache[toggle + fi];
toggle ^= TOGGLE_MASK;
@@ -1670,19 +1699,24 @@ public:
}
SkScalar b = (SkScalarMul(fDiff.fX, fx) +
SkScalarMul(fDiff.fY, fy) - fStartRadius) * 2;
SkScalar db = (SkScalarMul(fDiff.fX, dx) +
SkScalarMul(fDiff.fY, dy)) * 2;
if (proc == clamp_tileproc) {
for (; count > 0; --count) {
SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura, fOneOverTwoA, posRoot);
- SkFixed index = SkClampMax(t, 0xFFFF);
- SkASSERT(index <= 0xFFFF);
- *dstC++ = cache[index >> (16 - kCache32Bits)];
+ if (t < 0) {
+ *dstC++ = cache[-1];
+ } else if (t > 0xFFFF) {
+ *dstC++ = cache[kCache32Count * 2];
+ } else {
+ SkASSERT(t <= 0xFFFF);
+ *dstC++ = cache[t >> (16 - kCache32Bits)];
+ }
fx += dx;
fy += dy;
b += db;
}
} else if (proc == mirror_tileproc) {
for (; count > 0; --count) {
SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura, fOneOverTwoA, posRoot);
SkFixed index = mirror_tileproc(t);
|
