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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
|
/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrConfigConversionEffect.h"
#include "GrContext.h"
#include "GrTBackendEffectFactory.h"
#include "GrSimpleTextureEffect.h"
#include "gl/GrGLEffect.h"
#include "SkMatrix.h"
class GrGLConfigConversionEffect : public GrGLEffect {
public:
GrGLConfigConversionEffect(const GrBackendEffectFactory& factory,
const GrDrawEffect& drawEffect)
: INHERITED (factory) {
const GrConfigConversionEffect& effect = drawEffect.castEffect<GrConfigConversionEffect>();
fSwapRedAndBlue = effect.swapsRedAndBlue();
fPMConversion = effect.pmConversion();
}
virtual void emitCode(GrGLShaderBuilder* builder,
const GrDrawEffect&,
EffectKey key,
const char* outputColor,
const char* inputColor,
const TransformedCoordsArray& coords,
const TextureSamplerArray& samplers) SK_OVERRIDE {
builder->fsCodeAppendf("\t\t%s = ", outputColor);
builder->fsAppendTextureLookup(samplers[0], coords[0].c_str(), coords[0].type());
builder->fsCodeAppend(";\n");
if (GrConfigConversionEffect::kNone_PMConversion == fPMConversion) {
SkASSERT(fSwapRedAndBlue);
builder->fsCodeAppendf("\t%s = %s.bgra;\n", outputColor, outputColor);
} else {
const char* swiz = fSwapRedAndBlue ? "bgr" : "rgb";
switch (fPMConversion) {
case GrConfigConversionEffect::kMulByAlpha_RoundUp_PMConversion:
builder->fsCodeAppendf(
"\t\t%s = vec4(ceil(%s.%s * %s.a * 255.0) / 255.0, %s.a);\n",
outputColor, outputColor, swiz, outputColor, outputColor);
break;
case GrConfigConversionEffect::kMulByAlpha_RoundDown_PMConversion:
// Add a compensation(0.001) here to avoid the side effect of the floor operation.
// In Intel GPUs, the integer value converted from floor(%s.r * 255.0) / 255.0
// is less than the integer value converted from %s.r by 1 when the %s.r is
// converted from the integer value 2^n, such as 1, 2, 4, 8, etc.
builder->fsCodeAppendf(
"\t\t%s = vec4(floor(%s.%s * %s.a * 255.0 + 0.001) / 255.0, %s.a);\n",
outputColor, outputColor, swiz, outputColor, outputColor);
break;
case GrConfigConversionEffect::kDivByAlpha_RoundUp_PMConversion:
builder->fsCodeAppendf("\t\t%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(ceil(%s.%s / %s.a * 255.0) / 255.0, %s.a);\n",
outputColor, outputColor, outputColor, swiz, outputColor, outputColor);
break;
case GrConfigConversionEffect::kDivByAlpha_RoundDown_PMConversion:
builder->fsCodeAppendf("\t\t%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(floor(%s.%s / %s.a * 255.0) / 255.0, %s.a);\n",
outputColor, outputColor, outputColor, swiz, outputColor, outputColor);
break;
default:
GrCrash("Unknown conversion op.");
break;
}
}
SkString modulate;
GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor);
builder->fsCodeAppend(modulate.c_str());
}
static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
const GrConfigConversionEffect& conv = drawEffect.castEffect<GrConfigConversionEffect>();
return static_cast<EffectKey>(conv.swapsRedAndBlue()) | (conv.pmConversion() << 1);
}
private:
bool fSwapRedAndBlue;
GrConfigConversionEffect::PMConversion fPMConversion;
typedef GrGLEffect INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
GrConfigConversionEffect::GrConfigConversionEffect(GrTexture* texture,
bool swapRedAndBlue,
PMConversion pmConversion,
const SkMatrix& matrix)
: GrSingleTextureEffect(texture, matrix)
, fSwapRedAndBlue(swapRedAndBlue)
, fPMConversion(pmConversion) {
SkASSERT(kRGBA_8888_GrPixelConfig == texture->config() ||
kBGRA_8888_GrPixelConfig == texture->config());
// Why did we pollute our texture cache instead of using a GrSingleTextureEffect?
SkASSERT(swapRedAndBlue || kNone_PMConversion != pmConversion);
}
const GrBackendEffectFactory& GrConfigConversionEffect::getFactory() const {
return GrTBackendEffectFactory<GrConfigConversionEffect>::getInstance();
}
bool GrConfigConversionEffect::onIsEqual(const GrEffect& s) const {
const GrConfigConversionEffect& other = CastEffect<GrConfigConversionEffect>(s);
return this->texture(0) == s.texture(0) &&
other.fSwapRedAndBlue == fSwapRedAndBlue &&
other.fPMConversion == fPMConversion;
}
void GrConfigConversionEffect::getConstantColorComponents(GrColor* color,
uint32_t* validFlags) const {
this->updateConstantColorComponentsForModulation(color, validFlags);
}
///////////////////////////////////////////////////////////////////////////////
GR_DEFINE_EFFECT_TEST(GrConfigConversionEffect);
GrEffectRef* GrConfigConversionEffect::TestCreate(SkRandom* random,
GrContext*,
const GrDrawTargetCaps&,
GrTexture* textures[]) {
PMConversion pmConv = static_cast<PMConversion>(random->nextULessThan(kPMConversionCnt));
bool swapRB;
if (kNone_PMConversion == pmConv) {
swapRB = true;
} else {
swapRB = random->nextBool();
}
AutoEffectUnref effect(SkNEW_ARGS(GrConfigConversionEffect,
(textures[GrEffectUnitTest::kSkiaPMTextureIdx],
swapRB,
pmConv,
GrEffectUnitTest::TestMatrix(random))));
return CreateEffectRef(effect);
}
///////////////////////////////////////////////////////////////////////////////
void GrConfigConversionEffect::TestForPreservingPMConversions(GrContext* context,
PMConversion* pmToUPMRule,
PMConversion* upmToPMRule) {
*pmToUPMRule = kNone_PMConversion;
*upmToPMRule = kNone_PMConversion;
SkAutoTMalloc<uint32_t> data(256 * 256 * 3);
uint32_t* srcData = data.get();
uint32_t* firstRead = data.get() + 256 * 256;
uint32_t* secondRead = data.get() + 2 * 256 * 256;
// Fill with every possible premultiplied A, color channel value. There will be 256-y duplicate
// values in row y. We set r,g, and b to the same value since they are handled identically.
for (int y = 0; y < 256; ++y) {
for (int x = 0; x < 256; ++x) {
uint8_t* color = reinterpret_cast<uint8_t*>(&srcData[256*y + x]);
color[3] = y;
color[2] = GrMin(x, y);
color[1] = GrMin(x, y);
color[0] = GrMin(x, y);
}
}
GrTextureDesc desc;
desc.fFlags = kRenderTarget_GrTextureFlagBit |
kNoStencil_GrTextureFlagBit;
desc.fWidth = 256;
desc.fHeight = 256;
desc.fConfig = kRGBA_8888_GrPixelConfig;
SkAutoTUnref<GrTexture> readTex(context->createUncachedTexture(desc, NULL, 0));
if (!readTex.get()) {
return;
}
SkAutoTUnref<GrTexture> tempTex(context->createUncachedTexture(desc, NULL, 0));
if (!tempTex.get()) {
return;
}
desc.fFlags = kNone_GrTextureFlags;
SkAutoTUnref<GrTexture> dataTex(context->createUncachedTexture(desc, data, 0));
if (!dataTex.get()) {
return;
}
static const PMConversion kConversionRules[][2] = {
{kDivByAlpha_RoundDown_PMConversion, kMulByAlpha_RoundUp_PMConversion},
{kDivByAlpha_RoundUp_PMConversion, kMulByAlpha_RoundDown_PMConversion},
};
GrContext::AutoWideOpenIdentityDraw awoid(context, NULL);
bool failed = true;
for (size_t i = 0; i < GR_ARRAY_COUNT(kConversionRules) && failed; ++i) {
*pmToUPMRule = kConversionRules[i][0];
*upmToPMRule = kConversionRules[i][1];
static const SkRect kDstRect = SkRect::MakeWH(SkIntToScalar(256), SkIntToScalar(256));
static const SkRect kSrcRect = SkRect::MakeWH(SK_Scalar1, SK_Scalar1);
// We do a PM->UPM draw from dataTex to readTex and read the data. Then we do a UPM->PM draw
// from readTex to tempTex followed by a PM->UPM draw to readTex and finally read the data.
// We then verify that two reads produced the same values.
AutoEffectUnref pmToUPM1(SkNEW_ARGS(GrConfigConversionEffect, (dataTex,
false,
*pmToUPMRule,
SkMatrix::I())));
AutoEffectUnref upmToPM(SkNEW_ARGS(GrConfigConversionEffect, (readTex,
false,
*upmToPMRule,
SkMatrix::I())));
AutoEffectUnref pmToUPM2(SkNEW_ARGS(GrConfigConversionEffect, (tempTex,
false,
*pmToUPMRule,
SkMatrix::I())));
SkAutoTUnref<GrEffectRef> pmToUPMEffect1(CreateEffectRef(pmToUPM1));
SkAutoTUnref<GrEffectRef> upmToPMEffect(CreateEffectRef(upmToPM));
SkAutoTUnref<GrEffectRef> pmToUPMEffect2(CreateEffectRef(pmToUPM2));
context->setRenderTarget(readTex->asRenderTarget());
GrPaint paint1;
paint1.addColorEffect(pmToUPMEffect1);
context->drawRectToRect(paint1, kDstRect, kSrcRect);
readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, firstRead);
context->setRenderTarget(tempTex->asRenderTarget());
GrPaint paint2;
paint2.addColorEffect(upmToPMEffect);
context->drawRectToRect(paint2, kDstRect, kSrcRect);
context->setRenderTarget(readTex->asRenderTarget());
GrPaint paint3;
paint3.addColorEffect(pmToUPMEffect2);
context->drawRectToRect(paint3, kDstRect, kSrcRect);
readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, secondRead);
failed = false;
for (int y = 0; y < 256 && !failed; ++y) {
for (int x = 0; x <= y; ++x) {
if (firstRead[256 * y + x] != secondRead[256 * y + x]) {
failed = true;
break;
}
}
}
}
if (failed) {
*pmToUPMRule = kNone_PMConversion;
*upmToPMRule = kNone_PMConversion;
}
}
const GrEffectRef* GrConfigConversionEffect::Create(GrTexture* texture,
bool swapRedAndBlue,
PMConversion pmConversion,
const SkMatrix& matrix) {
if (!swapRedAndBlue && kNone_PMConversion == pmConversion) {
// If we returned a GrConfigConversionEffect that was equivalent to a GrSimpleTextureEffect
// then we may pollute our texture cache with redundant shaders. So in the case that no
// conversions were requested we instead return a GrSimpleTextureEffect.
return GrSimpleTextureEffect::Create(texture, matrix);
} else {
if (kRGBA_8888_GrPixelConfig != texture->config() &&
kBGRA_8888_GrPixelConfig != texture->config() &&
kNone_PMConversion != pmConversion) {
// The PM conversions assume colors are 0..255
return NULL;
}
AutoEffectUnref effect(SkNEW_ARGS(GrConfigConversionEffect, (texture,
swapRedAndBlue,
pmConversion,
matrix)));
return CreateEffectRef(effect);
}
}
|
