• file
• revisions
• annotate
• diff
• comparison
• raw

gfx/skia/trunk/src/gpu/effects/GrConvolutionEffect.h@6474c204b198 (annotated)

gfx/skia/trunk/src/gpu/effects/GrConvolutionEffect.h

Wed, 31 Dec 2014 06:09:35 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 06:09:35 +0100

changeset 0

6474c204b198

permissions

-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0	1	/*
michael@0	2	* Copyright 2012 Google Inc.
michael@0	3	*
michael@0	4	* Use of this source code is governed by a BSD-style license that can be
michael@0	5	* found in the LICENSE file.
michael@0	6	*/
michael@0	7
michael@0	8	#ifndef GrConvolutionEffect_DEFINED
michael@0	9	#define GrConvolutionEffect_DEFINED
michael@0	10
michael@0	11	#include "Gr1DKernelEffect.h"
michael@0	12
michael@0	13	class GrGLConvolutionEffect;
michael@0	14
michael@0	15	/**
michael@0	16	* A convolution effect. The kernel is specified as an array of 2 * half-width
michael@0	17	* + 1 weights. Each texel is multiplied by it's weight and summed to determine
michael@0	18	* the output color. The output color is modulated by the input color.
michael@0	19	*/
michael@0	20	class GrConvolutionEffect : public Gr1DKernelEffect {
michael@0	21
michael@0	22	public:
michael@0	23
michael@0	24	/// Convolve with an arbitrary user-specified kernel
michael@0	25	static GrEffectRef* Create(GrTexture* tex,
michael@0	26	Direction dir,
michael@0	27	int halfWidth,
michael@0	28	const float* kernel,
michael@0	29	bool useBounds,
michael@0	30	float bounds[2]) {
michael@0	31	AutoEffectUnref effect(SkNEW_ARGS(GrConvolutionEffect, (tex,
michael@0	32	dir,
michael@0	33	halfWidth,
michael@0	34	kernel,
michael@0	35	useBounds,
michael@0	36	bounds)));
michael@0	37	return CreateEffectRef(effect);
michael@0	38	}
michael@0	39
michael@0	40	/// Convolve with a Gaussian kernel
michael@0	41	static GrEffectRef* CreateGaussian(GrTexture* tex,
michael@0	42	Direction dir,
michael@0	43	int halfWidth,
michael@0	44	float gaussianSigma,
michael@0	45	bool useBounds,
michael@0	46	float bounds[2]) {
michael@0	47	AutoEffectUnref effect(SkNEW_ARGS(GrConvolutionEffect, (tex,
michael@0	48	dir,
michael@0	49	halfWidth,
michael@0	50	gaussianSigma,
michael@0	51	useBounds,
michael@0	52	bounds)));
michael@0	53	return CreateEffectRef(effect);
michael@0	54	}
michael@0	55
michael@0	56	virtual ~GrConvolutionEffect();
michael@0	57
michael@0	58	const float* kernel() const { return fKernel; }
michael@0	59
michael@0	60	const float* bounds() const { return fBounds; }
michael@0	61	bool useBounds() const { return fUseBounds; }
michael@0	62
michael@0	63	static const char* Name() { return "Convolution"; }
michael@0	64
michael@0	65	typedef GrGLConvolutionEffect GLEffect;
michael@0	66
michael@0	67	virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
michael@0	68
michael@0	69	virtual void getConstantColorComponents(GrColor*, uint32_t* validFlags) const {
michael@0	70	// If the texture was opaque we could know that the output color if we knew the sum of the
michael@0	71	// kernel values.
michael@0	72	*validFlags = 0;
michael@0	73	}
michael@0	74
michael@0	75	enum {
michael@0	76	// This was decided based on the min allowed value for the max texture
michael@0	77	// samples per fragment program run in DX9SM2 (32). A sigma param of 4.0
michael@0	78	// on a blur filter gives a kernel width of 25 while a sigma of 5.0
michael@0	79	// would exceed a 32 wide kernel.
michael@0	80	kMaxKernelRadius = 12,
michael@0	81	// With a C++11 we could have a constexpr version of WidthFromRadius()
michael@0	82	// and not have to duplicate this calculation.
michael@0	83	kMaxKernelWidth = 2 * kMaxKernelRadius + 1,
michael@0	84	};
michael@0	85
michael@0	86	protected:
michael@0	87
michael@0	88	float fKernel[kMaxKernelWidth];
michael@0	89	bool fUseBounds;
michael@0	90	float fBounds[2];
michael@0	91
michael@0	92	private:
michael@0	93	GrConvolutionEffect(GrTexture*, Direction,
michael@0	94	int halfWidth,
michael@0	95	const float* kernel,
michael@0	96	bool useBounds,
michael@0	97	float bounds[2]);
michael@0	98
michael@0	99	/// Convolve with a Gaussian kernel
michael@0	100	GrConvolutionEffect(GrTexture*, Direction,
michael@0	101	int halfWidth,
michael@0	102	float gaussianSigma,
michael@0	103	bool useBounds,
michael@0	104	float bounds[2]);
michael@0	105
michael@0	106	virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
michael@0	107
michael@0	108	GR_DECLARE_EFFECT_TEST;
michael@0	109
michael@0	110	typedef Gr1DKernelEffect INHERITED;
michael@0	111	};
michael@0	112
michael@0	113	#endif