epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 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 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 9 | |
| 10 | #include "SkCornerPathEffect.h" |
| 11 | #include "SkPath.h" |
| 12 | #include "SkPoint.h" |
djsollen@google.com | c73dd5c | 2012-08-07 15:54:32 +0000 | [diff] [blame] | 13 | #include "SkFlattenableBuffers.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 14 | |
reed@google.com | 548a1f3 | 2012-12-18 16:12:09 +0000 | [diff] [blame] | 15 | SkCornerPathEffect::SkCornerPathEffect(SkScalar radius) : fRadius(radius) {} |
| 16 | SkCornerPathEffect::~SkCornerPathEffect() {} |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 17 | |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 18 | static bool ComputeStep(const SkPoint& a, const SkPoint& b, SkScalar radius, |
| 19 | SkPoint* step) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 20 | SkScalar dist = SkPoint::Distance(a, b); |
| 21 | |
| 22 | step->set(b.fX - a.fX, b.fY - a.fY); |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 23 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 24 | if (dist <= radius * 2) { |
| 25 | step->scale(SK_ScalarHalf); |
| 26 | return false; |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 27 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 28 | step->scale(SkScalarDiv(radius, dist)); |
| 29 | return true; |
| 30 | } |
| 31 | } |
| 32 | |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 33 | bool SkCornerPathEffect::filterPath(SkPath* dst, const SkPath& src, |
reed@google.com | 4bbdeac | 2013-01-24 21:03:11 +0000 | [diff] [blame] | 34 | SkStrokeRec*, const SkRect*) const { |
reed@google.com | 548a1f3 | 2012-12-18 16:12:09 +0000 | [diff] [blame] | 35 | if (0 == fRadius) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 36 | return false; |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 37 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 38 | |
| 39 | SkPath::Iter iter(src, false); |
| 40 | SkPath::Verb verb, prevVerb = (SkPath::Verb)-1; |
| 41 | SkPoint pts[4]; |
| 42 | |
| 43 | bool closed; |
| 44 | SkPoint moveTo, lastCorner; |
| 45 | SkVector firstStep, step; |
| 46 | bool prevIsValid = true; |
| 47 | |
| 48 | // to avoid warnings |
| 49 | moveTo.set(0, 0); |
| 50 | firstStep.set(0, 0); |
| 51 | lastCorner.set(0, 0); |
| 52 | |
| 53 | for (;;) { |
reed@google.com | 4a3b714 | 2012-05-16 17:16:46 +0000 | [diff] [blame] | 54 | switch (verb = iter.next(pts, false)) { |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 55 | case SkPath::kMove_Verb: |
| 56 | // close out the previous (open) contour |
| 57 | if (SkPath::kLine_Verb == prevVerb) { |
| 58 | dst->lineTo(lastCorner); |
| 59 | } |
| 60 | closed = iter.isClosedContour(); |
| 61 | if (closed) { |
| 62 | moveTo = pts[0]; |
| 63 | prevIsValid = false; |
| 64 | } else { |
| 65 | dst->moveTo(pts[0]); |
| 66 | prevIsValid = true; |
| 67 | } |
| 68 | break; |
| 69 | case SkPath::kLine_Verb: { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 70 | bool drawSegment = ComputeStep(pts[0], pts[1], fRadius, &step); |
| 71 | // prev corner |
| 72 | if (!prevIsValid) { |
| 73 | dst->moveTo(moveTo + step); |
| 74 | prevIsValid = true; |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 75 | } else { |
| 76 | dst->quadTo(pts[0].fX, pts[0].fY, pts[0].fX + step.fX, |
| 77 | pts[0].fY + step.fY); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 78 | } |
| 79 | if (drawSegment) { |
| 80 | dst->lineTo(pts[1].fX - step.fX, pts[1].fY - step.fY); |
| 81 | } |
| 82 | lastCorner = pts[1]; |
| 83 | prevIsValid = true; |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 84 | break; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 85 | } |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 86 | case SkPath::kQuad_Verb: |
| 87 | // TBD - just replicate the curve for now |
| 88 | if (!prevIsValid) { |
| 89 | dst->moveTo(pts[0]); |
| 90 | prevIsValid = true; |
| 91 | } |
| 92 | dst->quadTo(pts[1], pts[2]); |
| 93 | lastCorner = pts[2]; |
| 94 | firstStep.set(0, 0); |
| 95 | break; |
| 96 | case SkPath::kCubic_Verb: |
| 97 | if (!prevIsValid) { |
| 98 | dst->moveTo(pts[0]); |
| 99 | prevIsValid = true; |
| 100 | } |
| 101 | // TBD - just replicate the curve for now |
| 102 | dst->cubicTo(pts[1], pts[2], pts[3]); |
| 103 | lastCorner = pts[3]; |
| 104 | firstStep.set(0, 0); |
| 105 | break; |
| 106 | case SkPath::kClose_Verb: |
| 107 | if (firstStep.fX || firstStep.fY) { |
| 108 | dst->quadTo(lastCorner.fX, lastCorner.fY, |
| 109 | lastCorner.fX + firstStep.fX, |
| 110 | lastCorner.fY + firstStep.fY); |
| 111 | } |
| 112 | dst->close(); |
| 113 | break; |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 114 | case SkPath::kConic_Verb: |
| 115 | SkASSERT(0); |
| 116 | break; |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 117 | case SkPath::kDone_Verb: |
| 118 | goto DONE; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 119 | } |
| 120 | |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 121 | if (SkPath::kMove_Verb == prevVerb) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 122 | firstStep = step; |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 123 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 124 | prevVerb = verb; |
| 125 | } |
| 126 | DONE: |
| 127 | return true; |
| 128 | } |
| 129 | |
djsollen@google.com | 5492424 | 2012-03-29 15:18:04 +0000 | [diff] [blame] | 130 | void SkCornerPathEffect::flatten(SkFlattenableWriteBuffer& buffer) const { |
| 131 | this->INHERITED::flatten(buffer); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 132 | buffer.writeScalar(fRadius); |
| 133 | } |
| 134 | |
mike@reedtribe.org | 3334c3a | 2011-04-20 11:39:28 +0000 | [diff] [blame] | 135 | SkCornerPathEffect::SkCornerPathEffect(SkFlattenableReadBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 136 | fRadius = buffer.readScalar(); |
| 137 | } |