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1 /* | 1 /* |
2 * Copyright 2010 Google Inc. | 2 * Copyright 2010 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 GrClip_DEFINED | 8 #ifndef GrClip_DEFINED |
9 #define GrClip_DEFINED | 9 #define GrClip_DEFINED |
10 | 10 |
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102 */ | 102 */ |
103 class GrClip { | 103 class GrClip { |
104 public: | 104 public: |
105 virtual bool quickContains(const SkRect&) const = 0; | 105 virtual bool quickContains(const SkRect&) const = 0; |
106 virtual void getConservativeBounds(int width, int height, SkIRect* devResult
, | 106 virtual void getConservativeBounds(int width, int height, SkIRect* devResult
, |
107 bool* isIntersectionOfRects = nullptr) co
nst = 0; | 107 bool* isIntersectionOfRects = nullptr) co
nst = 0; |
108 virtual bool apply(GrContext*, const GrPipelineBuilder&, GrDrawContext*, | 108 virtual bool apply(GrContext*, const GrPipelineBuilder&, GrDrawContext*, |
109 const SkRect* devBounds, GrAppliedClip*) const = 0; | 109 const SkRect* devBounds, GrAppliedClip*) const = 0; |
110 | 110 |
111 virtual ~GrClip() {} | 111 virtual ~GrClip() {} |
112 | |
113 protected: | |
114 /** | |
115 * Returns true if a clip can safely disable its scissor test for a particul
ar draw. | |
116 */ | |
117 static bool CanIgnoreScissor(const SkIRect& scissorRect, const SkRect& drawB
ounds) { | |
118 // This is the maximum distance that a draw may extend beyond a clip's s
cissor and still | |
119 // count as inside. We use a sloppy compare because the draw may have ch
osen its bounds in a | |
120 // different coord system. The rationale for 1e-3 is that in the coverag
e case (and barring | |
121 // unexpected rounding), as long as coverage stays below 0.5 * 1/256 we
ought to be OK. | |
122 constexpr SkScalar fuzz = 1e-3f; | |
123 SkASSERT(!scissorRect.isEmpty()); | |
124 SkASSERT(!drawBounds.isEmpty()); | |
125 return scissorRect.fLeft <= drawBounds.fLeft + fuzz && | |
126 scissorRect.fTop <= drawBounds.fTop + fuzz && | |
127 scissorRect.fRight >= drawBounds.fRight - fuzz && | |
128 scissorRect.fBottom >= drawBounds.fBottom - fuzz; | |
129 } | |
130 | |
131 friend class GrClipMaskManager; | |
132 }; | 112 }; |
133 | 113 |
134 /** | 114 /** |
135 * Specialized implementation for no clip. | 115 * Specialized implementation for no clip. |
136 */ | 116 */ |
137 class GrNoClip final : public GrClip { | 117 class GrNoClip final : public GrClip { |
138 private: | 118 private: |
139 bool quickContains(const SkRect&) const final { return true; } | 119 bool quickContains(const SkRect&) const final { return true; } |
140 void getConservativeBounds(int width, int height, SkIRect* devResult, | 120 void getConservativeBounds(int width, int height, SkIRect* devResult, |
141 bool* isIntersectionOfRects) const final; | 121 bool* isIntersectionOfRects) const final; |
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231 bool* isIntersectionOfRects) const final; | 211 bool* isIntersectionOfRects) const final; |
232 bool apply(GrContext*, const GrPipelineBuilder&, GrDrawContext*, | 212 bool apply(GrContext*, const GrPipelineBuilder&, GrDrawContext*, |
233 const SkRect* devBounds, GrAppliedClip*) const final; | 213 const SkRect* devBounds, GrAppliedClip*) const final; |
234 | 214 |
235 private: | 215 private: |
236 SkIPoint fOrigin; | 216 SkIPoint fOrigin; |
237 SkAutoTUnref<const SkClipStack> fStack; | 217 SkAutoTUnref<const SkClipStack> fStack; |
238 }; | 218 }; |
239 | 219 |
240 #endif | 220 #endif |
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