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
|
/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkArenaAlloc.h"
#include "SkBlendModePriv.h"
#include "SkComposeShader.h"
#include "SkColorFilter.h"
#include "SkColorData.h"
#include "SkColorShader.h"
#include "SkRasterPipeline.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkString.h"
#include "../jumper/SkJumper.h"
sk_sp<SkShader> SkShader::MakeCompose(sk_sp<SkShader> dst, sk_sp<SkShader> src, SkBlendMode mode,
float lerpT) {
if (!src || !dst || SkScalarIsNaN(lerpT)) {
return nullptr;
}
lerpT = SkScalarPin(lerpT, 0, 1);
if (lerpT == 0) {
return dst;
} else if (lerpT == 1) {
if (mode == SkBlendMode::kSrc) {
return src;
}
if (mode == SkBlendMode::kDst) {
return dst;
}
}
return sk_sp<SkShader>(new SkComposeShader(std::move(dst), std::move(src), mode, lerpT));
}
///////////////////////////////////////////////////////////////////////////////
sk_sp<SkFlattenable> SkComposeShader::CreateProc(SkReadBuffer& buffer) {
sk_sp<SkShader> dst(buffer.readShader());
sk_sp<SkShader> src(buffer.readShader());
unsigned mode = buffer.read32();
float lerp = buffer.readScalar();
// check for valid mode before we cast to the enum type
if (!buffer.validate(mode <= (unsigned)SkBlendMode::kLastMode)) {
return nullptr;
}
return MakeCompose(std::move(dst), std::move(src), static_cast<SkBlendMode>(mode), lerp);
}
void SkComposeShader::flatten(SkWriteBuffer& buffer) const {
buffer.writeFlattenable(fDst.get());
buffer.writeFlattenable(fSrc.get());
buffer.write32((int)fMode);
buffer.writeScalar(fLerpT);
}
sk_sp<SkShader> SkComposeShader::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
return MakeCompose(xformer->apply(fDst.get()), xformer->apply(fSrc.get()),
fMode, fLerpT);
}
#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
bool SkComposeShader::asACompose(ComposeRec* rec) const {
if (!this->isJustMode()) {
return false;
}
if (rec) {
rec->fShaderA = fDst.get();
rec->fShaderB = fSrc.get();
rec->fBlendMode = fMode;
}
return true;
}
#endif
bool SkComposeShader::onAppendStages(const StageRec& rec) const {
struct Storage {
float fRGBA[4 * SkJumper_kMaxStride];
float fAlpha;
};
auto storage = rec.fAlloc->make<Storage>();
if (!as_SB(fSrc)->appendStages(rec)) {
return false;
}
// This outputs r,g,b,a, which we'll need later when we apply the mode, but we save it off now
// since fShaderB will overwrite them.
rec.fPipeline->append(SkRasterPipeline::store_rgba, storage->fRGBA);
if (!as_SB(fDst)->appendStages(rec)) {
return false;
}
// We now have our logical 'dst' in r,g,b,a, but we need it in dr,dg,db,da for the mode/lerp
// so we have to shuttle them. If we had a stage the would load_into_dst, then we could
// reverse the two shader invocations, and avoid this move...
rec.fPipeline->append(SkRasterPipeline::move_src_dst);
rec.fPipeline->append(SkRasterPipeline::load_rgba, storage->fRGBA);
if (!this->isJustLerp()) {
SkBlendMode_AppendStages(fMode, rec.fPipeline);
}
if (!this->isJustMode()) {
rec.fPipeline->append(SkRasterPipeline::lerp_1_float, &fLerpT);
}
return true;
}
#if SK_SUPPORT_GPU
#include "effects/GrConstColorProcessor.h"
#include "effects/GrXfermodeFragmentProcessor.h"
/////////////////////////////////////////////////////////////////////
std::unique_ptr<GrFragmentProcessor> SkComposeShader::asFragmentProcessor(
const GrFPArgs& args) const {
if (this->isJustMode()) {
SkASSERT(fMode != SkBlendMode::kSrc && fMode != SkBlendMode::kDst); // caught in factory
if (fMode == SkBlendMode::kClear) {
return GrConstColorProcessor::Make(GrColor4f::TransparentBlack(),
GrConstColorProcessor::InputMode::kIgnore);
}
}
std::unique_ptr<GrFragmentProcessor> fpA(as_SB(fDst)->asFragmentProcessor(args));
if (!fpA) {
return nullptr;
}
std::unique_ptr<GrFragmentProcessor> fpB(as_SB(fSrc)->asFragmentProcessor(args));
if (!fpB) {
return nullptr;
}
// TODO: account for fLerpT when it is < 1
return GrXfermodeFragmentProcessor::MakeFromTwoProcessors(std::move(fpB),
std::move(fpA), fMode);
}
#endif
|
