The Tor Browser / file comparison
comparison: gfx/skia/trunk/src/pathops/SkPathWriter.cpp
gfx/skia/trunk/src/pathops/SkPathWriter.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:3df069b0e04d |
|---|---|
| 1 /* | |
| 2 * Copyright 2012 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 #include "SkPathOpsPoint.h" | |
| 8 #include "SkPathWriter.h" | |
| 9 | |
| 10 // wrap path to keep track of whether the contour is initialized and non-empty | |
| 11 SkPathWriter::SkPathWriter(SkPath& path) | |
| 12 : fPathPtr(&path) | |
| 13 , fCloses(0) | |
| 14 , fMoves(0) | |
| 15 { | |
| 16 init(); | |
| 17 } | |
| 18 | |
| 19 void SkPathWriter::close() { | |
| 20 if (!fHasMove) { | |
| 21 return; | |
| 22 } | |
| 23 bool callClose = isClosed(); | |
| 24 lineTo(); | |
| 25 if (fEmpty) { | |
| 26 return; | |
| 27 } | |
| 28 if (callClose) { | |
| 29 #if DEBUG_PATH_CONSTRUCTION | |
| 30 SkDebugf("path.close();\n"); | |
| 31 #endif | |
| 32 fPathPtr->close(); | |
| 33 fCloses++; | |
| 34 } | |
| 35 init(); | |
| 36 } | |
| 37 | |
| 38 void SkPathWriter::cubicTo(const SkPoint& pt1, const SkPoint& pt2, const SkPoint& pt3) { | |
| 39 lineTo(); | |
| 40 if (fEmpty && AlmostEqualUlps(fDefer[0], pt1) && AlmostEqualUlps(pt1, pt2) | |
| 41 && AlmostEqualUlps(pt2, pt3)) { | |
| 42 deferredLine(pt3); | |
| 43 return; | |
| 44 } | |
| 45 moveTo(); | |
| 46 fDefer[1] = pt3; | |
| 47 nudge(); | |
| 48 fDefer[0] = fDefer[1]; | |
| 49 #if DEBUG_PATH_CONSTRUCTION | |
| 50 SkDebugf("path.cubicTo(%1.9g,%1.9g, %1.9g,%1.9g, %1.9g,%1.9g);\n", | |
| 51 pt1.fX, pt1.fY, pt2.fX, pt2.fY, fDefer[1].fX, fDefer[1].fY); | |
| 52 #endif | |
| 53 fPathPtr->cubicTo(pt1.fX, pt1.fY, pt2.fX, pt2.fY, fDefer[1].fX, fDefer[1].fY); | |
| 54 fEmpty = false; | |
| 55 } | |
| 56 | |
| 57 void SkPathWriter::deferredLine(const SkPoint& pt) { | |
| 58 if (pt == fDefer[1]) { | |
| 59 return; | |
| 60 } | |
| 61 if (changedSlopes(pt)) { | |
| 62 lineTo(); | |
| 63 fDefer[0] = fDefer[1]; | |
| 64 } | |
| 65 fDefer[1] = pt; | |
| 66 } | |
| 67 | |
| 68 void SkPathWriter::deferredMove(const SkPoint& pt) { | |
| 69 fMoved = true; | |
| 70 fHasMove = true; | |
| 71 fEmpty = true; | |
| 72 fDefer[0] = fDefer[1] = pt; | |
| 73 } | |
| 74 | |
| 75 void SkPathWriter::deferredMoveLine(const SkPoint& pt) { | |
| 76 if (!fHasMove) { | |
| 77 deferredMove(pt); | |
| 78 } | |
| 79 deferredLine(pt); | |
| 80 } | |
| 81 | |
| 82 bool SkPathWriter::hasMove() const { | |
| 83 return fHasMove; | |
| 84 } | |
| 85 | |
| 86 void SkPathWriter::init() { | |
| 87 fEmpty = true; | |
| 88 fHasMove = false; | |
| 89 fMoved = false; | |
| 90 } | |
| 91 | |
| 92 bool SkPathWriter::isClosed() const { | |
| 93 return !fEmpty && SkDPoint::ApproximatelyEqual(fFirstPt, fDefer[1]); | |
| 94 } | |
| 95 | |
| 96 void SkPathWriter::lineTo() { | |
| 97 if (fDefer[0] == fDefer[1]) { | |
| 98 return; | |
| 99 } | |
| 100 moveTo(); | |
| 101 nudge(); | |
| 102 fEmpty = false; | |
| 103 #if DEBUG_PATH_CONSTRUCTION | |
| 104 SkDebugf("path.lineTo(%1.9g,%1.9g);\n", fDefer[1].fX, fDefer[1].fY); | |
| 105 #endif | |
| 106 fPathPtr->lineTo(fDefer[1].fX, fDefer[1].fY); | |
| 107 fDefer[0] = fDefer[1]; | |
| 108 } | |
| 109 | |
| 110 const SkPath* SkPathWriter::nativePath() const { | |
| 111 return fPathPtr; | |
| 112 } | |
| 113 | |
| 114 void SkPathWriter::nudge() { | |
| 115 if (fEmpty || !AlmostEqualUlps(fDefer[1].fX, fFirstPt.fX) | |
| 116 || !AlmostEqualUlps(fDefer[1].fY, fFirstPt.fY)) { | |
| 117 return; | |
| 118 } | |
| 119 fDefer[1] = fFirstPt; | |
| 120 } | |
| 121 | |
| 122 void SkPathWriter::quadTo(const SkPoint& pt1, const SkPoint& pt2) { | |
| 123 lineTo(); | |
| 124 if (fEmpty && AlmostEqualUlps(fDefer[0], pt1) && AlmostEqualUlps(pt1, pt2)) { | |
| 125 deferredLine(pt2); | |
| 126 return; | |
| 127 } | |
| 128 moveTo(); | |
| 129 fDefer[1] = pt2; | |
| 130 nudge(); | |
| 131 fDefer[0] = fDefer[1]; | |
| 132 #if DEBUG_PATH_CONSTRUCTION | |
| 133 SkDebugf("path.quadTo(%1.9g,%1.9g, %1.9g,%1.9g);\n", | |
| 134 pt1.fX, pt1.fY, fDefer[1].fX, fDefer[1].fY); | |
| 135 #endif | |
| 136 fPathPtr->quadTo(pt1.fX, pt1.fY, fDefer[1].fX, fDefer[1].fY); | |
| 137 fEmpty = false; | |
| 138 } | |
| 139 | |
| 140 bool SkPathWriter::someAssemblyRequired() const { | |
| 141 return fCloses < fMoves; | |
| 142 } | |
| 143 | |
| 144 bool SkPathWriter::changedSlopes(const SkPoint& pt) const { | |
| 145 if (fDefer[0] == fDefer[1]) { | |
| 146 return false; | |
| 147 } | |
| 148 SkScalar deferDx = fDefer[1].fX - fDefer[0].fX; | |
| 149 SkScalar deferDy = fDefer[1].fY - fDefer[0].fY; | |
| 150 SkScalar lineDx = pt.fX - fDefer[1].fX; | |
| 151 SkScalar lineDy = pt.fY - fDefer[1].fY; | |
| 152 return deferDx * lineDy != deferDy * lineDx; | |
| 153 } | |
| 154 | |
| 155 void SkPathWriter::moveTo() { | |
| 156 if (!fMoved) { | |
| 157 return; | |
| 158 } | |
| 159 fFirstPt = fDefer[0]; | |
| 160 #if DEBUG_PATH_CONSTRUCTION | |
| 161 SkDebugf("path.moveTo(%1.9g,%1.9g);\n", fDefer[0].fX, fDefer[0].fY); | |
| 162 #endif | |
| 163 fPathPtr->moveTo(fDefer[0].fX, fDefer[0].fY); | |
| 164 fMoved = false; | |
| 165 fMoves++; | |
| 166 } |
