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
|
/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrBicubicTextureEffect_DEFINED
#define GrBicubicTextureEffect_DEFINED
#include "GrSingleTextureEffect.h"
#include "GrTextureDomain.h"
#include "gl/GrGLProcessor.h"
class GrGLBicubicEffect;
class GrInvariantOutput;
class GrBicubicEffect : public GrSingleTextureEffect {
public:
enum {
kFilterTexelPad = 2, // Given a src rect in texels to be filtered, this number of
// surrounding texels are needed by the kernel in x and y.
};
virtual ~GrBicubicEffect();
const float* coefficients() const { return fCoefficients; }
const char* name() const SK_OVERRIDE { return "Bicubic"; }
void getGLProcessorKey(const GrGLCaps&, GrProcessorKeyBuilder*) const SK_OVERRIDE;
GrGLFragmentProcessor* createGLInstance() const SK_OVERRIDE;
const GrTextureDomain& domain() const { return fDomain; }
/**
* Create a simple filter effect with custom bicubic coefficients and optional domain.
*/
static GrFragmentProcessor* Create(GrTexture* tex, const SkScalar coefficients[16],
const SkRect* domain = NULL) {
if (NULL == domain) {
static const SkShader::TileMode kTileModes[] = { SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode };
return Create(tex, coefficients, GrCoordTransform::MakeDivByTextureWHMatrix(tex),
kTileModes);
} else {
return SkNEW_ARGS(GrBicubicEffect, (tex, coefficients,
GrCoordTransform::MakeDivByTextureWHMatrix(tex),
*domain));
}
}
/**
* Create a Mitchell filter effect with specified texture matrix and x/y tile modes.
*/
static GrFragmentProcessor* Create(GrTexture* tex, const SkMatrix& matrix,
SkShader::TileMode tileModes[2]) {
return Create(tex, gMitchellCoefficients, matrix, tileModes);
}
/**
* Create a filter effect with custom bicubic coefficients, the texture matrix, and the x/y
* tilemodes.
*/
static GrFragmentProcessor* Create(GrTexture* tex, const SkScalar coefficients[16],
const SkMatrix& matrix,
const SkShader::TileMode tileModes[2]) {
return SkNEW_ARGS(GrBicubicEffect, (tex, coefficients, matrix, tileModes));
}
/**
* Create a Mitchell filter effect with a texture matrix and a domain.
*/
static GrFragmentProcessor* Create(GrTexture* tex, const SkMatrix& matrix,
const SkRect& domain) {
return SkNEW_ARGS(GrBicubicEffect, (tex, gMitchellCoefficients, matrix, domain));
}
/**
* Determines whether the bicubic effect should be used based on the transformation from the
* local coords to the device. Returns true if the bicubic effect should be used. filterMode
* is set to appropriate filtering mode to use regardless of the return result (e.g. when this
* returns false it may indicate that the best fallback is to use kMipMap, kBilerp, or
* kNearest).
*/
static bool ShouldUseBicubic(const SkMatrix& localCoordsToDevice,
GrTextureParams::FilterMode* filterMode);
private:
GrBicubicEffect(GrTexture*, const SkScalar coefficients[16],
const SkMatrix &matrix, const SkShader::TileMode tileModes[2]);
GrBicubicEffect(GrTexture*, const SkScalar coefficients[16],
const SkMatrix &matrix, const SkRect& domain);
bool onIsEqual(const GrFragmentProcessor&) const SK_OVERRIDE;
void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE;
float fCoefficients[16];
GrTextureDomain fDomain;
GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
static const SkScalar gMitchellCoefficients[16];
typedef GrSingleTextureEffect INHERITED;
};
#endif
|
