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
|
/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkLumaColorFilter.h"
#include "SkPM4f.h"
#include "SkColorData.h"
#include "SkRasterPipeline.h"
#include "SkString.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#endif
void SkLumaColorFilter::onAppendStages(SkRasterPipeline* p,
SkColorSpace* dst,
SkArenaAlloc* scratch,
bool shaderIsOpaque) const {
p->append(SkRasterPipeline::luminance_to_alpha);
}
sk_sp<SkColorFilter> SkLumaColorFilter::Make() {
return sk_sp<SkColorFilter>(new SkLumaColorFilter);
}
SkLumaColorFilter::SkLumaColorFilter() : INHERITED() {}
sk_sp<SkFlattenable> SkLumaColorFilter::CreateProc(SkReadBuffer&) {
return Make();
}
void SkLumaColorFilter::flatten(SkWriteBuffer&) const {}
#ifndef SK_IGNORE_TO_STRING
void SkLumaColorFilter::toString(SkString* str) const {
str->append("SkLumaColorFilter ");
}
#endif
#if SK_SUPPORT_GPU
class LumaColorFilterEffect : public GrFragmentProcessor {
public:
static std::unique_ptr<GrFragmentProcessor> Make() {
return std::unique_ptr<GrFragmentProcessor>(new LumaColorFilterEffect);
}
const char* name() const override { return "Luminance-to-Alpha"; }
std::unique_ptr<GrFragmentProcessor> clone() const override { return Make(); }
private:
class GLSLProcessor : public GrGLSLFragmentProcessor {
public:
static void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*) {}
void emitCode(EmitArgs& args) override {
if (nullptr == args.fInputColor) {
args.fInputColor = "float4(1)";
}
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
fragBuilder->codeAppendf("\tfloat luma = dot(float3(%f, %f, %f), %s.rgb);\n",
SK_ITU_BT709_LUM_COEFF_R,
SK_ITU_BT709_LUM_COEFF_G,
SK_ITU_BT709_LUM_COEFF_B,
args.fInputColor);
fragBuilder->codeAppendf("\t%s = float4(0, 0, 0, luma);\n",
args.fOutputColor);
}
private:
typedef GrGLSLFragmentProcessor INHERITED;
};
LumaColorFilterEffect() : INHERITED(kConstantOutputForConstantInput_OptimizationFlag) {
this->initClassID<LumaColorFilterEffect>();
}
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
return new GLSLProcessor;
}
virtual void onGetGLSLProcessorKey(const GrShaderCaps& caps,
GrProcessorKeyBuilder* b) const override {
GLSLProcessor::GenKey(*this, caps, b);
}
bool onIsEqual(const GrFragmentProcessor&) const override { return true; }
GrColor4f constantOutputForConstantInput(GrColor4f input) const override {
float luma = SK_ITU_BT709_LUM_COEFF_R * input.fRGBA[0] +
SK_ITU_BT709_LUM_COEFF_G * input.fRGBA[1] +
SK_ITU_BT709_LUM_COEFF_B * input.fRGBA[2];
return GrColor4f(0, 0, 0, luma);
}
typedef GrFragmentProcessor INHERITED;
};
std::unique_ptr<GrFragmentProcessor> SkLumaColorFilter::asFragmentProcessor(GrContext*,
SkColorSpace*) const {
return LumaColorFilterEffect::Make();
}
#endif
|
