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| 1 /* libs/graphics/effects/Sk1DPathEffect.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 "Sk1DPathEffect.h" | |
| 19 #include "SkPathMeasure.h" | |
| 20 | |
| 21 bool Sk1DPathEffect::filterPath(SkPath* dst, const SkPath& src, SkScalar* width) | |
| 22 { | |
| 23 SkPathMeasure meas(src, false); | |
| 24 do { | |
| 25 SkScalar length = meas.getLength(); | |
| 26 SkScalar distance = this->begin(length); | |
| 27 while (distance < length) | |
| 28 { | |
| 29 SkScalar delta = this->next(dst, distance, meas); | |
| 30 if (delta <= 0) | |
| 31 break; | |
| 32 distance += delta; | |
| 33 } | |
| 34 } while (meas.nextContour()); | |
| 35 return true; | |
| 36 } | |
| 37 | |
| 38 ////////////////////////////////////////////////////////////////////////////////
/////////// | |
| 39 | |
| 40 SkPath1DPathEffect::SkPath1DPathEffect(const SkPath& path, SkScalar advance, | |
| 41 SkScalar phase, Style style) : fPath(path) | |
| 42 { | |
| 43 if (advance <= 0 || path.isEmpty()) | |
| 44 { | |
| 45 SkDEBUGF(("SkPath1DPathEffect can't use advance <= 0\n")); | |
| 46 fAdvance = 0; // signals we can't draw anything | |
| 47 } | |
| 48 else | |
| 49 { | |
| 50 // cleanup their phase parameter, inverting it so that it becomes an | |
| 51 // offset along the path (to match the interpretation in PostScript) | |
| 52 if (phase < 0) | |
| 53 { | |
| 54 phase = -phase; | |
| 55 if (phase > advance) | |
| 56 phase = SkScalarMod(phase, advance); | |
| 57 } | |
| 58 else | |
| 59 { | |
| 60 if (phase > advance) | |
| 61 phase = SkScalarMod(phase, advance); | |
| 62 phase = advance - phase; | |
| 63 } | |
| 64 // now catch the edge case where phase == advance (within epsilon) | |
| 65 if (phase >= advance) | |
| 66 phase = 0; | |
| 67 SkASSERT(phase >= 0); | |
| 68 | |
| 69 fAdvance = advance; | |
| 70 fInitialOffset = phase; | |
| 71 | |
| 72 if ((unsigned)style >= kStyleCount) { | |
| 73 SkDEBUGF(("SkPath1DPathEffect style enum out of range %d\n", style))
; | |
| 74 } | |
| 75 fStyle = style; | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 bool SkPath1DPathEffect::filterPath(SkPath* dst, const SkPath& src, SkScalar* wi
dth) | |
| 80 { | |
| 81 if (fAdvance > 0) | |
| 82 { | |
| 83 *width = -1; | |
| 84 return this->INHERITED::filterPath(dst, src, width); | |
| 85 } | |
| 86 return false; | |
| 87 } | |
| 88 | |
| 89 static void morphpoints(SkPoint dst[], const SkPoint src[], int count, | |
| 90 SkPathMeasure& meas, SkScalar dist) | |
| 91 { | |
| 92 for (int i = 0; i < count; i++) | |
| 93 { | |
| 94 SkPoint pos; | |
| 95 SkVector tangent; | |
| 96 | |
| 97 SkScalar sx = src[i].fX; | |
| 98 SkScalar sy = src[i].fY; | |
| 99 | |
| 100 meas.getPosTan(dist + sx, &pos, &tangent); | |
| 101 | |
| 102 SkMatrix matrix; | |
| 103 SkPoint pt; | |
| 104 | |
| 105 pt.set(sx, sy); | |
| 106 matrix.setSinCos(tangent.fY, tangent.fX, 0, 0); | |
| 107 matrix.preTranslate(-sx, 0); | |
| 108 matrix.postTranslate(pos.fX, pos.fY); | |
| 109 matrix.mapPoints(&dst[i], &pt, 1); | |
| 110 } | |
| 111 } | |
| 112 | |
| 113 /* TODO | |
| 114 | |
| 115 Need differentially more subdivisions when the follow-path is curvy. Not sure ho
w to | |
| 116 determine that, but we need it. I guess a cheap answer is let the caller tell us
, | |
| 117 but that seems like a cop-out. Another answer is to get Rob Johnson to figure it
out. | |
| 118 */ | |
| 119 static void morphpath(SkPath* dst, const SkPath& src, SkPathMeasure& meas, SkSca
lar dist) | |
| 120 { | |
| 121 SkPath::Iter iter(src, false); | |
| 122 SkPoint srcP[4], dstP[3]; | |
| 123 SkPath::Verb verb; | |
| 124 | |
| 125 while ((verb = iter.next(srcP)) != SkPath::kDone_Verb) | |
| 126 { | |
| 127 switch (verb) { | |
| 128 case SkPath::kMove_Verb: | |
| 129 morphpoints(dstP, srcP, 1, meas, dist); | |
| 130 dst->moveTo(dstP[0]); | |
| 131 break; | |
| 132 case SkPath::kLine_Verb: | |
| 133 srcP[2] = srcP[1]; | |
| 134 srcP[1].set(SkScalarAve(srcP[0].fX, srcP[2].fX), | |
| 135 SkScalarAve(srcP[0].fY, srcP[2].fY)); | |
| 136 // fall through to quad | |
| 137 case SkPath::kQuad_Verb: | |
| 138 morphpoints(dstP, &srcP[1], 2, meas, dist); | |
| 139 dst->quadTo(dstP[0], dstP[1]); | |
| 140 break; | |
| 141 case SkPath::kCubic_Verb: | |
| 142 morphpoints(dstP, &srcP[1], 3, meas, dist); | |
| 143 dst->cubicTo(dstP[0], dstP[1], dstP[2]); | |
| 144 break; | |
| 145 case SkPath::kClose_Verb: | |
| 146 dst->close(); | |
| 147 break; | |
| 148 default: | |
| 149 SkASSERT(!"unknown verb"); | |
| 150 break; | |
| 151 } | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 SkPath1DPathEffect::SkPath1DPathEffect(SkFlattenableReadBuffer& buffer) | |
| 156 { | |
| 157 fAdvance = buffer.readScalar(); | |
| 158 if (fAdvance > 0) { | |
| 159 fPath.unflatten(buffer); | |
| 160 fInitialOffset = buffer.readScalar(); | |
| 161 fStyle = (Style) buffer.readU8(); | |
| 162 } | |
| 163 } | |
| 164 | |
| 165 SkScalar SkPath1DPathEffect::begin(SkScalar contourLength) | |
| 166 { | |
| 167 return fInitialOffset; | |
| 168 } | |
| 169 | |
| 170 void SkPath1DPathEffect::flatten(SkFlattenableWriteBuffer& buffer) | |
| 171 { | |
| 172 buffer.writeScalar(fAdvance); | |
| 173 if (fAdvance > 0) { | |
| 174 fPath.flatten(buffer); | |
| 175 buffer.writeScalar(fInitialOffset); | |
| 176 buffer.write8(fStyle); | |
| 177 } | |
| 178 } | |
| 179 | |
| 180 SkScalar SkPath1DPathEffect::next(SkPath* dst, SkScalar distance, SkPathMeasure&
meas) | |
| 181 { | |
| 182 switch (fStyle) { | |
| 183 case kTranslate_Style: | |
| 184 { | |
| 185 SkPoint pos; | |
| 186 meas.getPosTan(distance, &pos, NULL); | |
| 187 dst->addPath(fPath, pos.fX, pos.fY); | |
| 188 } | |
| 189 break; | |
| 190 case kRotate_Style: | |
| 191 { | |
| 192 SkMatrix matrix; | |
| 193 meas.getMatrix(distance, &matrix); | |
| 194 dst->addPath(fPath, matrix); | |
| 195 } | |
| 196 break; | |
| 197 case kMorph_Style: | |
| 198 morphpath(dst, fPath, meas, distance); | |
| 199 break; | |
| 200 default: | |
| 201 SkASSERT(!"unknown Style enum"); | |
| 202 break; | |
| 203 } | |
| 204 return fAdvance; | |
| 205 } | |
| 206 | |
| OLD | NEW |
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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/