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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef GrConvexPolyEffect_DEFINED | 8 #ifndef GrConvexPolyEffect_DEFINED |
9 #define GrConvexPolyEffect_DEFINED | 9 #define GrConvexPolyEffect_DEFINED |
10 | 10 |
11 #include "GrDrawTargetCaps.h" | 11 #include "GrDrawTargetCaps.h" |
12 #include "GrEffect.h" | 12 #include "GrEffect.h" |
13 | 13 |
14 class GrGLConvexPolyEffect; | 14 class GrGLConvexPolyEffect; |
15 class SkPath; | 15 class SkPath; |
16 | 16 |
17 /** | 17 /** |
18 * An effect that renders a convex polygon. It is intended to be used as a cover
age effect. | 18 * An effect that renders a convex polygon. It is intended to be used as a cover
age effect. |
19 * Bounding geometry is rendered and the effect computes coverage based on the f
ragment's | 19 * Bounding geometry is rendered and the effect computes coverage based on the f
ragment's |
20 * position relative to the polygon. | 20 * position relative to the polygon. |
21 */ | 21 */ |
22 class GrConvexPolyEffect : public GrEffect { | 22 class GrConvexPolyEffect : public GrEffect { |
23 public: | 23 public: |
24 /** This could be expanded to include a AA hairline mode. If so, unify with
GrBezierEffect's | |
25 enum. */ | |
26 enum EdgeType { | 24 enum EdgeType { |
27 kFillNoAA_EdgeType, | 25 kFillNoAA_EdgeType, |
28 kFillAA_EdgeType, | 26 kFillAA_EdgeType, |
| 27 kInverseFillNoAA_EdgeType, |
| 28 kInverseFillAA_EdgeType, |
29 | 29 |
30 kLastEdgeType = kFillAA_EdgeType, | 30 kLastEdgeType = kInverseFillAA_EdgeType, |
31 }; | 31 }; |
32 | 32 |
33 enum { | 33 enum { |
34 kEdgeTypeCnt = kLastEdgeType + 1, | 34 kEdgeTypeCnt = kLastEdgeType + 1, |
35 kMaxEdges = 8, | 35 kMaxEdges = 8, |
36 }; | 36 }; |
37 | 37 |
38 /** | 38 /** |
39 * edges is a set of n edge equations where n is limited to kMaxEdges. It co
ntains 3*n values. | 39 * edges is a set of n edge equations where n is limited to kMaxEdges. It co
ntains 3*n values. |
40 * The edges should form a convex polygon. The positive half-plane is consid
ered to be the | 40 * The edges should form a convex polygon. The positive half-plane is consid
ered to be the |
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57 /** | 57 /** |
58 * Creates an effect that clips against the path. If the path is not a conve
x polygon, is | 58 * Creates an effect that clips against the path. If the path is not a conve
x polygon, is |
59 * inverse filled, or has too many edges, this will return NULL. If offset i
s non-NULL, then | 59 * inverse filled, or has too many edges, this will return NULL. If offset i
s non-NULL, then |
60 * the path is translated by the vector. | 60 * the path is translated by the vector. |
61 */ | 61 */ |
62 static GrEffectRef* Create(EdgeType, const SkPath&, const SkVector* offset=
NULL); | 62 static GrEffectRef* Create(EdgeType, const SkPath&, const SkVector* offset=
NULL); |
63 | 63 |
64 /** | 64 /** |
65 * Creates an effect that fills inside the rect with AA edges.. | 65 * Creates an effect that fills inside the rect with AA edges.. |
66 */ | 66 */ |
67 static GrEffectRef* CreateForAAFillRect(const SkRect&); | 67 static GrEffectRef* Create(EdgeType, const SkRect&); |
68 | 68 |
69 virtual ~GrConvexPolyEffect(); | 69 virtual ~GrConvexPolyEffect(); |
70 | 70 |
71 static const char* Name() { return "ConvexPoly"; } | 71 static const char* Name() { return "ConvexPoly"; } |
72 | 72 |
73 EdgeType getEdgeType() const { return fEdgeType; } | 73 EdgeType getEdgeType() const { return fEdgeType; } |
74 | 74 |
75 int getEdgeCount() const { return fEdgeCount; } | 75 int getEdgeCount() const { return fEdgeCount; } |
76 | 76 |
77 const SkScalar* getEdges() const { return fEdges; } | 77 const SkScalar* getEdges() const { return fEdges; } |
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91 int fEdgeCount; | 91 int fEdgeCount; |
92 SkScalar fEdges[3 * kMaxEdges]; | 92 SkScalar fEdges[3 * kMaxEdges]; |
93 | 93 |
94 GR_DECLARE_EFFECT_TEST; | 94 GR_DECLARE_EFFECT_TEST; |
95 | 95 |
96 typedef GrEffect INHERITED; | 96 typedef GrEffect INHERITED; |
97 }; | 97 }; |
98 | 98 |
99 | 99 |
100 #endif | 100 #endif |
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