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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 #include "SkPathEffect.h"
     10 #include "SkPath.h"
     11 #include "SkFlattenableBuffers.h"
     12 
     13 ///////////////////////////////////////////////////////////////////////////////
     14 
     15 void SkPathEffect::computeFastBounds(SkRect* dst, const SkRect& src) const {
     16     *dst = src;
     17 }
     18 
     19 bool SkPathEffect::asPoints(PointData* results, const SkPath& src,
     20                     const SkStrokeRec&, const SkMatrix&, const SkRect*) const {
     21     return false;
     22 }
     23 
     24 ///////////////////////////////////////////////////////////////////////////////
     25 
     26 SkPairPathEffect::SkPairPathEffect(SkPathEffect* pe0, SkPathEffect* pe1)
     27         : fPE0(pe0), fPE1(pe1) {
     28     SkASSERT(pe0);
     29     SkASSERT(pe1);
     30     fPE0->ref();
     31     fPE1->ref();
     32 }
     33 
     34 SkPairPathEffect::~SkPairPathEffect() {
     35     SkSafeUnref(fPE0);
     36     SkSafeUnref(fPE1);
     37 }
     38 
     39 /*
     40     Format: [oe0-factory][pe1-factory][pe0-size][pe0-data][pe1-data]
     41 */
     42 void SkPairPathEffect::flatten(SkFlattenableWriteBuffer& buffer) const {
     43     this->INHERITED::flatten(buffer);
     44     buffer.writeFlattenable(fPE0);
     45     buffer.writeFlattenable(fPE1);
     46 }
     47 
     48 SkPairPathEffect::SkPairPathEffect(SkFlattenableReadBuffer& buffer) {
     49     fPE0 = buffer.readPathEffect();
     50     fPE1 = buffer.readPathEffect();
     51     // either of these may fail, so we have to check for nulls later on
     52 }
     53 
     54 ///////////////////////////////////////////////////////////////////////////////
     55 
     56 bool SkComposePathEffect::filterPath(SkPath* dst, const SkPath& src,
     57                              SkStrokeRec* rec, const SkRect* cullRect) const {
     58     // we may have failed to unflatten these, so we have to check
     59     if (!fPE0 || !fPE1) {
     60         return false;
     61     }
     62 
     63     SkPath          tmp;
     64     const SkPath*   ptr = &src;
     65 
     66     if (fPE1->filterPath(&tmp, src, rec, cullRect)) {
     67         ptr = &tmp;
     68     }
     69     return fPE0->filterPath(dst, *ptr, rec, cullRect);
     70 }
     71 
     72 ///////////////////////////////////////////////////////////////////////////////
     73 
     74 bool SkSumPathEffect::filterPath(SkPath* dst, const SkPath& src,
     75                              SkStrokeRec* rec, const SkRect* cullRect) const {
     76     // use bit-or so that we always call both, even if the first one succeeds
     77     return fPE0->filterPath(dst, src, rec, cullRect) |
     78            fPE1->filterPath(dst, src, rec, cullRect);
     79 }
     80