SkPathEffect.cpp revision e16efc1882ab34a0bb3ae361a2d37f840044cf87 
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
15SK_DEFINE_INST_COUNT(SkPathEffect)
16
17void SkPathEffect::computeFastBounds(SkRect* dst, const SkRect& src) const {
18    *dst = src;
19}
20
21bool SkPathEffect::asPoints(PointData* results, const SkPath& src,
22                    const SkStrokeRec&, const SkMatrix&, const SkRect*) const {
23    return false;
24}
25
26///////////////////////////////////////////////////////////////////////////////
27
28SkPairPathEffect::SkPairPathEffect(SkPathEffect* pe0, SkPathEffect* pe1)
29        : fPE0(pe0), fPE1(pe1) {
30    SkASSERT(pe0);
31    SkASSERT(pe1);
32    fPE0->ref();
33    fPE1->ref();
34}
35
36SkPairPathEffect::~SkPairPathEffect() {
37    SkSafeUnref(fPE0);
38    SkSafeUnref(fPE1);
39}
40
41/*
42    Format: [oe0-factory][pe1-factory][pe0-size][pe0-data][pe1-data]
43*/
44void SkPairPathEffect::flatten(SkFlattenableWriteBuffer& buffer) const {
45    this->INHERITED::flatten(buffer);
46    buffer.writeFlattenable(fPE0);
47    buffer.writeFlattenable(fPE1);
48}
49
50SkPairPathEffect::SkPairPathEffect(SkFlattenableReadBuffer& buffer) {
51    fPE0 = buffer.readFlattenableT<SkPathEffect>();
52    fPE1 = buffer.readFlattenableT<SkPathEffect>();
53    // either of these may fail, so we have to check for nulls later on
54}
55
56///////////////////////////////////////////////////////////////////////////////
57
58bool SkComposePathEffect::filterPath(SkPath* dst, const SkPath& src,
59                             SkStrokeRec* rec, const SkRect* cullRect) const {
60    // we may have failed to unflatten these, so we have to check
61    if (!fPE0 || !fPE1) {
62        return false;
63    }
64
65    SkPath          tmp;
66    const SkPath*   ptr = &src;
67
68    if (fPE1->filterPath(&tmp, src, rec, cullRect)) {
69        ptr = &tmp;
70    }
71    return fPE0->filterPath(dst, *ptr, rec, cullRect);
72}
73
74///////////////////////////////////////////////////////////////////////////////
75
76bool SkSumPathEffect::filterPath(SkPath* dst, const SkPath& src,
77                             SkStrokeRec* rec, const SkRect* cullRect) const {
78    // use bit-or so that we always call both, even if the first one succeeds
79    return fPE0->filterPath(dst, src, rec, cullRect) |
80           fPE1->filterPath(dst, src, rec, cullRect);
81}
82