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      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 "Sk2DPathEffect.h"
     11 #include "SkReadBuffer.h"
     12 #include "SkWriteBuffer.h"
     13 #include "SkPath.h"
     14 #include "SkRegion.h"
     15 
     16 Sk2DPathEffect::Sk2DPathEffect(const SkMatrix& mat) : fMatrix(mat) {
     17     fMatrixIsInvertible = mat.invert(&fInverse);
     18 }
     19 
     20 bool Sk2DPathEffect::filterPath(SkPath* dst, const SkPath& src,
     21                                 SkStrokeRec*, const SkRect*) const {
     22     if (!fMatrixIsInvertible) {
     23         return false;
     24     }
     25 
     26     SkPath  tmp;
     27     SkIRect ir;
     28 
     29     src.transform(fInverse, &tmp);
     30     tmp.getBounds().round(&ir);
     31     if (!ir.isEmpty()) {
     32         this->begin(ir, dst);
     33 
     34         SkRegion rgn;
     35         rgn.setPath(tmp, SkRegion(ir));
     36         SkRegion::Iterator iter(rgn);
     37         for (; !iter.done(); iter.next()) {
     38             const SkIRect& rect = iter.rect();
     39             for (int y = rect.fTop; y < rect.fBottom; ++y) {
     40                 this->nextSpan(rect.fLeft, y, rect.width(), dst);
     41             }
     42         }
     43 
     44         this->end(dst);
     45     }
     46     return true;
     47 }
     48 
     49 void Sk2DPathEffect::nextSpan(int x, int y, int count, SkPath* path) const {
     50     if (!fMatrixIsInvertible) {
     51         return;
     52     }
     53 
     54     const SkMatrix& mat = this->getMatrix();
     55     SkPoint src, dst;
     56 
     57     src.set(SkIntToScalar(x) + SK_ScalarHalf, SkIntToScalar(y) + SK_ScalarHalf);
     58     do {
     59         mat.mapPoints(&dst, &src, 1);
     60         this->next(dst, x++, y, path);
     61         src.fX += SK_Scalar1;
     62     } while (--count > 0);
     63 }
     64 
     65 void Sk2DPathEffect::begin(const SkIRect& uvBounds, SkPath* dst) const {}
     66 void Sk2DPathEffect::next(const SkPoint& loc, int u, int v, SkPath* dst) const {}
     67 void Sk2DPathEffect::end(SkPath* dst) const {}
     68 
     69 ///////////////////////////////////////////////////////////////////////////////
     70 
     71 void Sk2DPathEffect::flatten(SkWriteBuffer& buffer) const {
     72     this->INHERITED::flatten(buffer);
     73     buffer.writeMatrix(fMatrix);
     74 }
     75 
     76 Sk2DPathEffect::Sk2DPathEffect(SkReadBuffer& buffer) {
     77     buffer.readMatrix(&fMatrix);
     78     fMatrixIsInvertible = fMatrix.invert(&fInverse);
     79 }
     80 
     81 ///////////////////////////////////////////////////////////////////////////////
     82 
     83 bool SkLine2DPathEffect::filterPath(SkPath* dst, const SkPath& src,
     84                             SkStrokeRec* rec, const SkRect* cullRect) const {
     85     if (this->INHERITED::filterPath(dst, src, rec, cullRect)) {
     86         rec->setStrokeStyle(fWidth);
     87         return true;
     88     }
     89     return false;
     90 }
     91 
     92 void SkLine2DPathEffect::nextSpan(int u, int v, int ucount, SkPath* dst) const {
     93     if (ucount > 1) {
     94         SkPoint    src[2], dstP[2];
     95 
     96         src[0].set(SkIntToScalar(u) + SK_ScalarHalf, SkIntToScalar(v) + SK_ScalarHalf);
     97         src[1].set(SkIntToScalar(u+ucount) + SK_ScalarHalf, SkIntToScalar(v) + SK_ScalarHalf);
     98         this->getMatrix().mapPoints(dstP, src, 2);
     99 
    100         dst->moveTo(dstP[0]);
    101         dst->lineTo(dstP[1]);
    102     }
    103 }
    104 
    105 SkLine2DPathEffect::SkLine2DPathEffect(SkReadBuffer& buffer) : INHERITED(buffer) {
    106     fWidth = buffer.readScalar();
    107 }
    108 
    109 void SkLine2DPathEffect::flatten(SkWriteBuffer &buffer) const {
    110     this->INHERITED::flatten(buffer);
    111     buffer.writeScalar(fWidth);
    112 }
    113 
    114 ///////////////////////////////////////////////////////////////////////////////
    115 
    116 SkPath2DPathEffect::SkPath2DPathEffect(const SkMatrix& m, const SkPath& p)
    117     : INHERITED(m), fPath(p) {
    118 }
    119 
    120 SkPath2DPathEffect::SkPath2DPathEffect(SkReadBuffer& buffer)
    121         : INHERITED(buffer) {
    122     buffer.readPath(&fPath);
    123 }
    124 
    125 void SkPath2DPathEffect::flatten(SkWriteBuffer& buffer) const {
    126     this->INHERITED::flatten(buffer);
    127     buffer.writePath(fPath);
    128 }
    129 
    130 void SkPath2DPathEffect::next(const SkPoint& loc, int u, int v,
    131                               SkPath* dst) const {
    132     dst->addPath(fPath, loc.fX, loc.fY);
    133 }
    134