Index: skia/effects/Sk1DPathEffect.cpp |
=================================================================== |
--- skia/effects/Sk1DPathEffect.cpp (revision 16859) |
+++ skia/effects/Sk1DPathEffect.cpp (working copy) |
@@ -1,206 +0,0 @@ |
-/* libs/graphics/effects/Sk1DPathEffect.cpp |
-** |
-** Copyright 2006, The Android Open Source Project |
-** |
-** Licensed under the Apache License, Version 2.0 (the "License"); |
-** you may not use this file except in compliance with the License. |
-** You may obtain a copy of the License at |
-** |
-** http://www.apache.org/licenses/LICENSE-2.0 |
-** |
-** Unless required by applicable law or agreed to in writing, software |
-** distributed under the License is distributed on an "AS IS" BASIS, |
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
-** See the License for the specific language governing permissions and |
-** limitations under the License. |
-*/ |
- |
-#include "Sk1DPathEffect.h" |
-#include "SkPathMeasure.h" |
- |
-bool Sk1DPathEffect::filterPath(SkPath* dst, const SkPath& src, SkScalar* width) |
-{ |
- SkPathMeasure meas(src, false); |
- do { |
- SkScalar length = meas.getLength(); |
- SkScalar distance = this->begin(length); |
- while (distance < length) |
- { |
- SkScalar delta = this->next(dst, distance, meas); |
- if (delta <= 0) |
- break; |
- distance += delta; |
- } |
- } while (meas.nextContour()); |
- return true; |
-} |
- |
-/////////////////////////////////////////////////////////////////////////////////////////// |
- |
-SkPath1DPathEffect::SkPath1DPathEffect(const SkPath& path, SkScalar advance, |
- SkScalar phase, Style style) : fPath(path) |
-{ |
- if (advance <= 0 || path.isEmpty()) |
- { |
- SkDEBUGF(("SkPath1DPathEffect can't use advance <= 0\n")); |
- fAdvance = 0; // signals we can't draw anything |
- } |
- else |
- { |
- // cleanup their phase parameter, inverting it so that it becomes an |
- // offset along the path (to match the interpretation in PostScript) |
- if (phase < 0) |
- { |
- phase = -phase; |
- if (phase > advance) |
- phase = SkScalarMod(phase, advance); |
- } |
- else |
- { |
- if (phase > advance) |
- phase = SkScalarMod(phase, advance); |
- phase = advance - phase; |
- } |
- // now catch the edge case where phase == advance (within epsilon) |
- if (phase >= advance) |
- phase = 0; |
- SkASSERT(phase >= 0); |
- |
- fAdvance = advance; |
- fInitialOffset = phase; |
- |
- if ((unsigned)style >= kStyleCount) { |
- SkDEBUGF(("SkPath1DPathEffect style enum out of range %d\n", style)); |
- } |
- fStyle = style; |
- } |
-} |
- |
-bool SkPath1DPathEffect::filterPath(SkPath* dst, const SkPath& src, SkScalar* width) |
-{ |
- if (fAdvance > 0) |
- { |
- *width = -1; |
- return this->INHERITED::filterPath(dst, src, width); |
- } |
- return false; |
-} |
- |
-static void morphpoints(SkPoint dst[], const SkPoint src[], int count, |
- SkPathMeasure& meas, SkScalar dist) |
-{ |
- for (int i = 0; i < count; i++) |
- { |
- SkPoint pos; |
- SkVector tangent; |
- |
- SkScalar sx = src[i].fX; |
- SkScalar sy = src[i].fY; |
- |
- meas.getPosTan(dist + sx, &pos, &tangent); |
- |
- SkMatrix matrix; |
- SkPoint pt; |
- |
- pt.set(sx, sy); |
- matrix.setSinCos(tangent.fY, tangent.fX, 0, 0); |
- matrix.preTranslate(-sx, 0); |
- matrix.postTranslate(pos.fX, pos.fY); |
- matrix.mapPoints(&dst[i], &pt, 1); |
- } |
-} |
- |
-/* TODO |
- |
-Need differentially more subdivisions when the follow-path is curvy. Not sure how to |
-determine that, but we need it. I guess a cheap answer is let the caller tell us, |
-but that seems like a cop-out. Another answer is to get Rob Johnson to figure it out. |
-*/ |
-static void morphpath(SkPath* dst, const SkPath& src, SkPathMeasure& meas, SkScalar dist) |
-{ |
- SkPath::Iter iter(src, false); |
- SkPoint srcP[4], dstP[3]; |
- SkPath::Verb verb; |
- |
- while ((verb = iter.next(srcP)) != SkPath::kDone_Verb) |
- { |
- switch (verb) { |
- case SkPath::kMove_Verb: |
- morphpoints(dstP, srcP, 1, meas, dist); |
- dst->moveTo(dstP[0]); |
- break; |
- case SkPath::kLine_Verb: |
- srcP[2] = srcP[1]; |
- srcP[1].set(SkScalarAve(srcP[0].fX, srcP[2].fX), |
- SkScalarAve(srcP[0].fY, srcP[2].fY)); |
- // fall through to quad |
- case SkPath::kQuad_Verb: |
- morphpoints(dstP, &srcP[1], 2, meas, dist); |
- dst->quadTo(dstP[0], dstP[1]); |
- break; |
- case SkPath::kCubic_Verb: |
- morphpoints(dstP, &srcP[1], 3, meas, dist); |
- dst->cubicTo(dstP[0], dstP[1], dstP[2]); |
- break; |
- case SkPath::kClose_Verb: |
- dst->close(); |
- break; |
- default: |
- SkASSERT(!"unknown verb"); |
- break; |
- } |
- } |
-} |
- |
-SkPath1DPathEffect::SkPath1DPathEffect(SkFlattenableReadBuffer& buffer) |
-{ |
- fAdvance = buffer.readScalar(); |
- if (fAdvance > 0) { |
- fPath.unflatten(buffer); |
- fInitialOffset = buffer.readScalar(); |
- fStyle = (Style) buffer.readU8(); |
- } |
-} |
- |
-SkScalar SkPath1DPathEffect::begin(SkScalar contourLength) |
-{ |
- return fInitialOffset; |
-} |
- |
-void SkPath1DPathEffect::flatten(SkFlattenableWriteBuffer& buffer) |
-{ |
- buffer.writeScalar(fAdvance); |
- if (fAdvance > 0) { |
- fPath.flatten(buffer); |
- buffer.writeScalar(fInitialOffset); |
- buffer.write8(fStyle); |
- } |
-} |
- |
-SkScalar SkPath1DPathEffect::next(SkPath* dst, SkScalar distance, SkPathMeasure& meas) |
-{ |
- switch (fStyle) { |
- case kTranslate_Style: |
- { |
- SkPoint pos; |
- meas.getPosTan(distance, &pos, NULL); |
- dst->addPath(fPath, pos.fX, pos.fY); |
- } |
- break; |
- case kRotate_Style: |
- { |
- SkMatrix matrix; |
- meas.getMatrix(distance, &matrix); |
- dst->addPath(fPath, matrix); |
- } |
- break; |
- case kMorph_Style: |
- morphpath(dst, fPath, meas, distance); |
- break; |
- default: |
- SkASSERT(!"unknown Style enum"); |
- break; |
- } |
- return fAdvance; |
-} |
- |