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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 "SkReadBuffer.h"
     12 #include "SkWriteBuffer.h"
     13 
     14 ///////////////////////////////////////////////////////////////////////////////
     15 
     16 void SkPathEffect::computeFastBounds(SkRect* dst, const SkRect& src) const {
     17     *dst = src;
     18 }
     19 
     20 bool SkPathEffect::asPoints(PointData* results, const SkPath& src,
     21                     const SkStrokeRec&, const SkMatrix&, const SkRect*) const {
     22     return false;
     23 }
     24 
     25 SkPathEffect::DashType SkPathEffect::asADash(DashInfo* info) const {
     26     return kNone_DashType;
     27 }
     28 
     29 ///////////////////////////////////////////////////////////////////////////////
     30 
     31 SkPairPathEffect::SkPairPathEffect(SkPathEffect* pe0, SkPathEffect* pe1)
     32         : fPE0(pe0), fPE1(pe1) {
     33     SkASSERT(pe0);
     34     SkASSERT(pe1);
     35     fPE0->ref();
     36     fPE1->ref();
     37 }
     38 
     39 SkPairPathEffect::~SkPairPathEffect() {
     40     SkSafeUnref(fPE0);
     41     SkSafeUnref(fPE1);
     42 }
     43 
     44 /*
     45     Format: [oe0-factory][pe1-factory][pe0-size][pe0-data][pe1-data]
     46 */
     47 void SkPairPathEffect::flatten(SkWriteBuffer& buffer) const {
     48     this->INHERITED::flatten(buffer);
     49     buffer.writeFlattenable(fPE0);
     50     buffer.writeFlattenable(fPE1);
     51 }
     52 
     53 SkPairPathEffect::SkPairPathEffect(SkReadBuffer& buffer) {
     54     fPE0 = buffer.readPathEffect();
     55     fPE1 = buffer.readPathEffect();
     56     // either of these may fail, so we have to check for nulls later on
     57 }
     58 
     59 ///////////////////////////////////////////////////////////////////////////////
     60 
     61 bool SkComposePathEffect::filterPath(SkPath* dst, const SkPath& src,
     62                              SkStrokeRec* rec, const SkRect* cullRect) const {
     63     // we may have failed to unflatten these, so we have to check
     64     if (!fPE0 || !fPE1) {
     65         return false;
     66     }
     67 
     68     SkPath          tmp;
     69     const SkPath*   ptr = &src;
     70 
     71     if (fPE1->filterPath(&tmp, src, rec, cullRect)) {
     72         ptr = &tmp;
     73     }
     74     return fPE0->filterPath(dst, *ptr, rec, cullRect);
     75 }
     76 
     77 ///////////////////////////////////////////////////////////////////////////////
     78 
     79 bool SkSumPathEffect::filterPath(SkPath* dst, const SkPath& src,
     80                              SkStrokeRec* rec, const SkRect* cullRect) const {
     81     // use bit-or so that we always call both, even if the first one succeeds
     82     return fPE0->filterPath(dst, src, rec, cullRect) |
     83            fPE1->filterPath(dst, src, rec, cullRect);
     84 }
     85