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comparison: gfx/skia/trunk/src/gpu/effects/GrConvexPolyEffect.h
gfx/skia/trunk/src/gpu/effects/GrConvexPolyEffect.h
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- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:2115d1d6b4bd |
|---|---|
| 1 /* | |
| 2 * Copyright 2014 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 GrConvexPolyEffect_DEFINED | |
| 9 #define GrConvexPolyEffect_DEFINED | |
| 10 | |
| 11 #include "GrDrawTargetCaps.h" | |
| 12 #include "GrEffect.h" | |
| 13 #include "GrTypesPriv.h" | |
| 14 | |
| 15 class GrGLConvexPolyEffect; | |
| 16 class SkPath; | |
| 17 | |
| 18 /** | |
| 19 * An effect that renders a convex polygon. It is intended to be used as a coverage effect. | |
| 20 * Bounding geometry is rendered and the effect computes coverage based on the fragment's | |
| 21 * position relative to the polygon. | |
| 22 */ | |
| 23 class GrConvexPolyEffect : public GrEffect { | |
| 24 public: | |
| 25 enum { | |
| 26 kMaxEdges = 8, | |
| 27 }; | |
| 28 | |
| 29 /** | |
| 30 * edges is a set of n edge equations where n is limited to kMaxEdges. It contains 3*n values. | |
| 31 * The edges should form a convex polygon. The positive half-plane is considered to be the | |
| 32 * inside. The equations should be normalized such that the first two coefficients are a unit | |
| 33 * 2d vector. | |
| 34 * | |
| 35 * Currently the edges are specified in device space. In the future we may prefer to specify | |
| 36 * them in src space. There are a number of ways this could be accomplished but we'd probably | |
| 37 * have to modify the effect/shaderbuilder interface to make it possible (e.g. give access | |
| 38 * to the view matrix or untransformed positions in the fragment shader). | |
| 39 */ | |
| 40 static GrEffectRef* Create(GrEffectEdgeType edgeType, int n, const SkScalar edges[]) { | |
| 41 if (n <= 0 || n > kMaxEdges || kHairlineAA_GrEffectEdgeType == edgeType) { | |
| 42 return NULL; | |
| 43 } | |
| 44 return CreateEffectRef(AutoEffectUnref(SkNEW_ARGS(GrConvexPolyEffect, | |
| 45 (edgeType, n, edges)))); | |
| 46 } | |
| 47 | |
| 48 /** | |
| 49 * Creates an effect that clips against the path. If the path is not a convex polygon, is | |
| 50 * inverse filled, or has too many edges, this will return NULL. If offset is non-NULL, then | |
| 51 * the path is translated by the vector. | |
| 52 */ | |
| 53 static GrEffectRef* Create(GrEffectEdgeType, const SkPath&, const SkVector* offset = NULL); | |
| 54 | |
| 55 /** | |
| 56 * Creates an effect that fills inside the rect with AA edges.. | |
| 57 */ | |
| 58 static GrEffectRef* Create(GrEffectEdgeType, const SkRect&); | |
| 59 | |
| 60 virtual ~GrConvexPolyEffect(); | |
| 61 | |
| 62 static const char* Name() { return "ConvexPoly"; } | |
| 63 | |
| 64 GrEffectEdgeType getEdgeType() const { return fEdgeType; } | |
| 65 | |
| 66 int getEdgeCount() const { return fEdgeCount; } | |
| 67 | |
| 68 const SkScalar* getEdges() const { return fEdges; } | |
| 69 | |
| 70 typedef GrGLConvexPolyEffect GLEffect; | |
| 71 | |
| 72 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; | |
| 73 | |
| 74 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; | |
| 75 | |
| 76 private: | |
| 77 GrConvexPolyEffect(GrEffectEdgeType edgeType, int n, const SkScalar edges[]); | |
| 78 | |
| 79 virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE; | |
| 80 | |
| 81 GrEffectEdgeType fEdgeType; | |
| 82 int fEdgeCount; | |
| 83 SkScalar fEdges[3 * kMaxEdges]; | |
| 84 | |
| 85 GR_DECLARE_EFFECT_TEST; | |
| 86 | |
| 87 typedef GrEffect INHERITED; | |
| 88 }; | |
| 89 | |
| 90 | |
| 91 #endif |
