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| 1 /* libs/graphics/effects/SkDiscretePathEffect.cpp | |
| 2 ** | |
| 3 ** Copyright 2006, The Android Open Source Project | |
| 4 ** | |
| 5 ** Licensed under the Apache License, Version 2.0 (the "License"); | |
| 6 ** you may not use this file except in compliance with the License. | |
| 7 ** You may obtain a copy of the License at | |
| 8 ** | |
| 9 ** http://www.apache.org/licenses/LICENSE-2.0 | |
| 10 ** | |
| 11 ** Unless required by applicable law or agreed to in writing, software | |
| 12 ** distributed under the License is distributed on an "AS IS" BASIS, | |
| 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 14 ** See the License for the specific language governing permissions and | |
| 15 ** limitations under the License. | |
| 16 */ | |
| 17 | |
| 18 #include "SkDiscretePathEffect.h" | |
| 19 #include "SkBuffer.h" | |
| 20 #include "SkPathMeasure.h" | |
| 21 #include "SkRandom.h" | |
| 22 | |
| 23 static void Perterb(SkPoint* p, const SkVector& tangent, SkScalar scale) | |
| 24 { | |
| 25 SkVector normal = tangent; | |
| 26 normal.rotateCCW(); | |
| 27 normal.setLength(scale); | |
| 28 *p += normal; | |
| 29 } | |
| 30 | |
| 31 | |
| 32 SkDiscretePathEffect::SkDiscretePathEffect(SkScalar segLength, SkScalar deviatio
n) | |
| 33 : fSegLength(segLength), fPerterb(deviation) | |
| 34 { | |
| 35 } | |
| 36 | |
| 37 bool SkDiscretePathEffect::filterPath(SkPath* dst, const SkPath& src, SkScalar*
width) | |
| 38 { | |
| 39 bool doFill = *width < 0; | |
| 40 | |
| 41 SkPathMeasure meas(src, doFill); | |
| 42 uint32_t seed = SkScalarRound(meas.getLength()); | |
| 43 SkRandom rand(seed ^ ((seed << 16) | (seed >> 16))); | |
| 44 SkScalar scale = fPerterb; | |
| 45 SkPoint p; | |
| 46 SkVector v; | |
| 47 | |
| 48 do { | |
| 49 SkScalar length = meas.getLength(); | |
| 50 | |
| 51 if (fSegLength * (2 + doFill) > length) | |
| 52 { | |
| 53 meas.getSegment(0, length, dst, true); // to short for us to mangle | |
| 54 } | |
| 55 else | |
| 56 { | |
| 57 int n = SkScalarRound(SkScalarDiv(length, fSegLength)); | |
| 58 SkScalar delta = length / n; | |
| 59 SkScalar distance = 0; | |
| 60 | |
| 61 if (meas.isClosed()) | |
| 62 { | |
| 63 n -= 1; | |
| 64 distance += delta/2; | |
| 65 } | |
| 66 meas.getPosTan(distance, &p, &v); | |
| 67 Perterb(&p, v, SkScalarMul(rand.nextSScalar1(), scale)); | |
| 68 dst->moveTo(p); | |
| 69 while (--n >= 0) | |
| 70 { | |
| 71 distance += delta; | |
| 72 meas.getPosTan(distance, &p, &v); | |
| 73 Perterb(&p, v, SkScalarMul(rand.nextSScalar1(), scale)); | |
| 74 dst->lineTo(p); | |
| 75 } | |
| 76 if (meas.isClosed()) | |
| 77 dst->close(); | |
| 78 } | |
| 79 } while (meas.nextContour()); | |
| 80 return true; | |
| 81 } | |
| 82 | |
| 83 SkFlattenable::Factory SkDiscretePathEffect::getFactory() | |
| 84 { | |
| 85 return CreateProc; | |
| 86 } | |
| 87 | |
| 88 SkFlattenable* SkDiscretePathEffect::CreateProc(SkFlattenableReadBuffer& buffer) | |
| 89 { | |
| 90 return SkNEW_ARGS(SkDiscretePathEffect, (buffer)); | |
| 91 } | |
| 92 | |
| 93 void SkDiscretePathEffect::flatten(SkFlattenableWriteBuffer& buffer) | |
| 94 { | |
| 95 buffer.writeScalar(fSegLength); | |
| 96 buffer.writeScalar(fPerterb); | |
| 97 } | |
| 98 | |
| 99 SkDiscretePathEffect::SkDiscretePathEffect(SkFlattenableReadBuffer& buffer) | |
| 100 { | |
| 101 fSegLength = buffer.readScalar(); | |
| 102 fPerterb = buffer.readScalar(); | |
| 103 } | |
| 104 | |
| 105 | |
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Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/