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| 1 /* | |
| 2 * Copyright 2013 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #ifndef GrEdgeEffect_DEFINED | |
| 9 #define GrEdgeEffect_DEFINED | |
| 10 | |
| 11 #include "GrEffect.h" | |
| 12 | |
| 13 class GrGLEdgeEffect; | |
| 14 | |
| 15 /** | |
| 16 * The output of this effect is one of three different edge types: hairlines, qu
ads, | |
| 17 * and hairline quads. | |
| 18 */ | |
| 19 | |
| 20 class GrEdgeEffect : public GrEffect { | |
| 21 public: | |
| 22 enum EdgeType { | |
| 23 /* 1-pixel wide line | |
| 24 2D implicit device coord line eq (a*x + b*y +c = 0). 4th component un
used. */ | |
| 25 kHairLine_EdgeType = 0, | |
| 26 /* Quadratic specified by 0=u^2-v canonical coords. u and v are the firs
t | |
| 27 two components of the vertex attribute. Coverage is based on signed | |
| 28 distance with negative being inside, positive outside. The edge is sp
ecified in | |
| 29 window space (y-down). If either the third or fourth component of the
interpolated | |
| 30 vertex coord is > 0 then the pixel is considered outside the edge. Th
is is used to | |
| 31 attempt to trim to a portion of the infinite quad. Requires shader de
rivative | |
| 32 instruction support. */ | |
| 33 kQuad_EdgeType, | |
| 34 /* Similar to above but for hairline quadratics. Uses unsigned distance. | |
| 35 Coverage is min(0, 1-distance). 3rd & 4th component unused. Requires | |
| 36 shader derivative instruction support. */ | |
| 37 kHairQuad_EdgeType, | |
| 38 | |
| 39 kLast_EdgeType = kHairQuad_EdgeType | |
| 40 }; | |
| 41 static const int kEdgeTypeCount = kLast_EdgeType + 1; | |
| 42 | |
| 43 static GrEffectRef* Create(EdgeType type) { | |
| 44 // we go through this so we only have one copy of each effect | |
| 45 static GrEffectRef* gEdgeEffectRef[kEdgeTypeCount] = { | |
| 46 CreateEffectRef(AutoEffectUnref(SkNEW_ARGS(GrEdgeEffect, (kHairLine_
EdgeType)))), | |
| 47 CreateEffectRef(AutoEffectUnref(SkNEW_ARGS(GrEdgeEffect, (kQuad_Edge
Type)))), | |
| 48 CreateEffectRef(AutoEffectUnref(SkNEW_ARGS(GrEdgeEffect, (kHairQuad_
EdgeType)))), | |
| 49 }; | |
| 50 static SkAutoTUnref<GrEffectRef> gUnref0(gEdgeEffectRef[0]); | |
| 51 static SkAutoTUnref<GrEffectRef> gUnref1(gEdgeEffectRef[1]); | |
| 52 static SkAutoTUnref<GrEffectRef> gUnref2(gEdgeEffectRef[2]); | |
| 53 | |
| 54 gEdgeEffectRef[type]->ref(); | |
| 55 return gEdgeEffectRef[type]; | |
| 56 } | |
| 57 | |
| 58 virtual ~GrEdgeEffect() {} | |
| 59 | |
| 60 static const char* Name() { return "Edge"; } | |
| 61 | |
| 62 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags
) const SK_OVERRIDE; | |
| 63 | |
| 64 typedef GrGLEdgeEffect GLEffect; | |
| 65 | |
| 66 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; | |
| 67 | |
| 68 EdgeType edgeType() const { return fEdgeType; } | |
| 69 | |
| 70 private: | |
| 71 GrEdgeEffect(EdgeType edgeType); | |
| 72 | |
| 73 virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE { | |
| 74 const GrEdgeEffect& qee = CastEffect<GrEdgeEffect>(other); | |
| 75 return qee.fEdgeType == fEdgeType; | |
| 76 } | |
| 77 | |
| 78 EdgeType fEdgeType; | |
| 79 | |
| 80 GR_DECLARE_EFFECT_TEST; | |
| 81 | |
| 82 typedef GrEffect INHERITED; | |
| 83 }; | |
| 84 | |
| 85 #endif | |
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Chromium Code Reviews
Issue 13344002:
Move edge GrEffects to locally defined classes (Closed)
Base URL: http://skia.googlecode.com/svn/trunk/