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comparison: gfx/skia/trunk/src/effects/SkDiscretePathEffect.cpp
gfx/skia/trunk/src/effects/SkDiscretePathEffect.cpp
- branch
- TOR_BUG_9701
- changeset 14
- 925c144e1f1f
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| -1:000000000000 | 0:2ce6fc019781 |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2006 The Android Open Source Project | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 | |
| 9 | |
| 10 #include "SkDiscretePathEffect.h" | |
| 11 #include "SkReadBuffer.h" | |
| 12 #include "SkWriteBuffer.h" | |
| 13 #include "SkPathMeasure.h" | |
| 14 #include "SkRandom.h" | |
| 15 | |
| 16 static void Perterb(SkPoint* p, const SkVector& tangent, SkScalar scale) { | |
| 17 SkVector normal = tangent; | |
| 18 normal.rotateCCW(); | |
| 19 normal.setLength(scale); | |
| 20 *p += normal; | |
| 21 } | |
| 22 | |
| 23 | |
| 24 SkDiscretePathEffect::SkDiscretePathEffect(SkScalar segLength, SkScalar deviation) | |
| 25 : fSegLength(segLength), fPerterb(deviation) | |
| 26 { | |
| 27 } | |
| 28 | |
| 29 bool SkDiscretePathEffect::filterPath(SkPath* dst, const SkPath& src, | |
| 30 SkStrokeRec* rec, const SkRect*) const { | |
| 31 bool doFill = rec->isFillStyle(); | |
| 32 | |
| 33 SkPathMeasure meas(src, doFill); | |
| 34 uint32_t seed = SkScalarRoundToInt(meas.getLength()); | |
| 35 SkLCGRandom rand(seed ^ ((seed << 16) | (seed >> 16))); | |
| 36 SkScalar scale = fPerterb; | |
| 37 SkPoint p; | |
| 38 SkVector v; | |
| 39 | |
| 40 do { | |
| 41 SkScalar length = meas.getLength(); | |
| 42 | |
| 43 if (fSegLength * (2 + doFill) > length) { | |
| 44 meas.getSegment(0, length, dst, true); // to short for us to mangle | |
| 45 } else { | |
| 46 int n = SkScalarRoundToInt(length / fSegLength); | |
| 47 SkScalar delta = length / n; | |
| 48 SkScalar distance = 0; | |
| 49 | |
| 50 if (meas.isClosed()) { | |
| 51 n -= 1; | |
| 52 distance += delta/2; | |
| 53 } | |
| 54 | |
| 55 if (meas.getPosTan(distance, &p, &v)) { | |
| 56 Perterb(&p, v, SkScalarMul(rand.nextSScalar1(), scale)); | |
| 57 dst->moveTo(p); | |
| 58 } | |
| 59 while (--n >= 0) { | |
| 60 distance += delta; | |
| 61 if (meas.getPosTan(distance, &p, &v)) { | |
| 62 Perterb(&p, v, SkScalarMul(rand.nextSScalar1(), scale)); | |
| 63 dst->lineTo(p); | |
| 64 } | |
| 65 } | |
| 66 if (meas.isClosed()) { | |
| 67 dst->close(); | |
| 68 } | |
| 69 } | |
| 70 } while (meas.nextContour()); | |
| 71 return true; | |
| 72 } | |
| 73 | |
| 74 void SkDiscretePathEffect::flatten(SkWriteBuffer& buffer) const { | |
| 75 this->INHERITED::flatten(buffer); | |
| 76 buffer.writeScalar(fSegLength); | |
| 77 buffer.writeScalar(fPerterb); | |
| 78 } | |
| 79 | |
| 80 SkDiscretePathEffect::SkDiscretePathEffect(SkReadBuffer& buffer) { | |
| 81 fSegLength = buffer.readScalar(); | |
| 82 fPerterb = buffer.readScalar(); | |
| 83 } |
