gfx/skia/trunk/src/gpu/effects/GrConvexPolyEffect.h@6474c204b198 (annotated)
gfx/skia/trunk/src/gpu/effects/GrConvexPolyEffect.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 2014 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 GrConvexPolyEffect_DEFINED |
| michael@0 | 9 | #define GrConvexPolyEffect_DEFINED |
| michael@0 | 10 | |
| michael@0 | 11 | #include "GrDrawTargetCaps.h" |
| michael@0 | 12 | #include "GrEffect.h" |
| michael@0 | 13 | #include "GrTypesPriv.h" |
| michael@0 | 14 | |
| michael@0 | 15 | class GrGLConvexPolyEffect; |
| michael@0 | 16 | class SkPath; |
| michael@0 | 17 | |
| michael@0 | 18 | /** |
| michael@0 | 19 | * An effect that renders a convex polygon. It is intended to be used as a coverage effect. |
| michael@0 | 20 | * Bounding geometry is rendered and the effect computes coverage based on the fragment's |
| michael@0 | 21 | * position relative to the polygon. |
| michael@0 | 22 | */ |
| michael@0 | 23 | class GrConvexPolyEffect : public GrEffect { |
| michael@0 | 24 | public: |
| michael@0 | 25 | enum { |
| michael@0 | 26 | kMaxEdges = 8, |
| michael@0 | 27 | }; |
| michael@0 | 28 | |
| michael@0 | 29 | /** |
| michael@0 | 30 | * edges is a set of n edge equations where n is limited to kMaxEdges. It contains 3*n values. |
| michael@0 | 31 | * The edges should form a convex polygon. The positive half-plane is considered to be the |
| michael@0 | 32 | * inside. The equations should be normalized such that the first two coefficients are a unit |
| michael@0 | 33 | * 2d vector. |
| michael@0 | 34 | * |
| michael@0 | 35 | * Currently the edges are specified in device space. In the future we may prefer to specify |
| michael@0 | 36 | * them in src space. There are a number of ways this could be accomplished but we'd probably |
| michael@0 | 37 | * have to modify the effect/shaderbuilder interface to make it possible (e.g. give access |
| michael@0 | 38 | * to the view matrix or untransformed positions in the fragment shader). |
| michael@0 | 39 | */ |
| michael@0 | 40 | static GrEffectRef* Create(GrEffectEdgeType edgeType, int n, const SkScalar edges[]) { |
| michael@0 | 41 | if (n <= 0 || n > kMaxEdges || kHairlineAA_GrEffectEdgeType == edgeType) { |
| michael@0 | 42 | return NULL; |
| michael@0 | 43 | } |
| michael@0 | 44 | return CreateEffectRef(AutoEffectUnref(SkNEW_ARGS(GrConvexPolyEffect, |
| michael@0 | 45 | (edgeType, n, edges)))); |
| michael@0 | 46 | } |
| michael@0 | 47 | |
| michael@0 | 48 | /** |
| michael@0 | 49 | * Creates an effect that clips against the path. If the path is not a convex polygon, is |
| michael@0 | 50 | * inverse filled, or has too many edges, this will return NULL. If offset is non-NULL, then |
| michael@0 | 51 | * the path is translated by the vector. |
| michael@0 | 52 | */ |
| michael@0 | 53 | static GrEffectRef* Create(GrEffectEdgeType, const SkPath&, const SkVector* offset = NULL); |
| michael@0 | 54 | |
| michael@0 | 55 | /** |
| michael@0 | 56 | * Creates an effect that fills inside the rect with AA edges.. |
| michael@0 | 57 | */ |
| michael@0 | 58 | static GrEffectRef* Create(GrEffectEdgeType, const SkRect&); |
| michael@0 | 59 | |
| michael@0 | 60 | virtual ~GrConvexPolyEffect(); |
| michael@0 | 61 | |
| michael@0 | 62 | static const char* Name() { return "ConvexPoly"; } |
| michael@0 | 63 | |
| michael@0 | 64 | GrEffectEdgeType getEdgeType() const { return fEdgeType; } |
| michael@0 | 65 | |
| michael@0 | 66 | int getEdgeCount() const { return fEdgeCount; } |
| michael@0 | 67 | |
| michael@0 | 68 | const SkScalar* getEdges() const { return fEdges; } |
| michael@0 | 69 | |
| michael@0 | 70 | typedef GrGLConvexPolyEffect GLEffect; |
| michael@0 | 71 | |
| michael@0 | 72 | virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; |
| michael@0 | 73 | |
| michael@0 | 74 | virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| michael@0 | 75 | |
| michael@0 | 76 | private: |
| michael@0 | 77 | GrConvexPolyEffect(GrEffectEdgeType edgeType, int n, const SkScalar edges[]); |
| michael@0 | 78 | |
| michael@0 | 79 | virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE; |
| michael@0 | 80 | |
| michael@0 | 81 | GrEffectEdgeType fEdgeType; |
| michael@0 | 82 | int fEdgeCount; |
| michael@0 | 83 | SkScalar fEdges[3 * kMaxEdges]; |
| michael@0 | 84 | |
| michael@0 | 85 | GR_DECLARE_EFFECT_TEST; |
| michael@0 | 86 | |
| michael@0 | 87 | typedef GrEffect INHERITED; |
| michael@0 | 88 | }; |
| michael@0 | 89 | |
| michael@0 | 90 | |
| michael@0 | 91 | #endif |
