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
|
/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGaussianConvolutionFragmentProcessor_DEFINED
#define GrGaussianConvolutionFragmentProcessor_DEFINED
#include "Gr1DKernelEffect.h"
/**
* A 1D Gaussian convolution effect. The kernel is computed as an array of 2 * half-width weights.
* Each texel is multiplied by it's weight and summed to determine the filtered color. The output
* color is set to a modulation of the filtered and input colors.
*/
class GrGaussianConvolutionFragmentProcessor : public Gr1DKernelEffect {
public:
/// Convolve with a Gaussian kernel
static sk_sp<GrFragmentProcessor> Make(GrTexture* tex,
Direction dir,
int halfWidth,
float gaussianSigma,
bool useBounds,
int* bounds) {
return sk_sp<GrFragmentProcessor>(new GrGaussianConvolutionFragmentProcessor(
tex, dir, halfWidth, gaussianSigma, useBounds, bounds));
}
static sk_sp<GrFragmentProcessor> Make(GrContext* context,
sk_sp<GrTextureProxy> proxy,
Direction dir,
int halfWidth,
float gaussianSigma,
bool useBounds,
int* bounds) {
return sk_sp<GrFragmentProcessor>(new GrGaussianConvolutionFragmentProcessor(
context, std::move(proxy), dir, halfWidth, gaussianSigma, useBounds, bounds));
}
~GrGaussianConvolutionFragmentProcessor() override;
const float* kernel() const { return fKernel; }
const int* bounds() const { return fBounds; }
bool useBounds() const { return fUseBounds; }
const char* name() const override { return "GaussianConvolution"; }
// This was decided based on the min allowed value for the max texture
// samples per fragment program run in DX9SM2 (32). A sigma param of 4.0
// on a blur filter gives a kernel width of 25 while a sigma of 5.0
// would exceed a 32 wide kernel.
static const int kMaxKernelRadius = 12;
// With a C++11 we could have a constexpr version of WidthFromRadius()
// and not have to duplicate this calculation.
static const int kMaxKernelWidth = 2 * kMaxKernelRadius + 1;
private:
/// Convolve with a Gaussian kernel
GrGaussianConvolutionFragmentProcessor(GrTexture*, Direction, int halfWidth,
float gaussianSigma, bool useBounds, int bounds[2]);
GrGaussianConvolutionFragmentProcessor(GrContext*, sk_sp<GrTextureProxy>, Direction,
int halfWidth, float gaussianSigma, bool useBounds,
int bounds[2]);
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
bool onIsEqual(const GrFragmentProcessor&) const override;
GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
// TODO: Inline the kernel constants into the generated shader code. This may involve pulling
// some of the logic from SkGpuBlurUtils into this class related to radius/sigma calculations.
float fKernel[kMaxKernelWidth];
bool fUseBounds;
int fBounds[2];
typedef Gr1DKernelEffect INHERITED;
};
#endif
|
