SkPathEffect.cpp revision 54924243c1b65b3ee6d8fa064b50a9b1bb2a19a5 
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 "SkPathEffect.h"
11#include "SkPath.h"
12#include "SkBuffer.h"
13
14///////////////////////////////////////////////////////////////////////////////
15
16SkPairPathEffect::SkPairPathEffect(SkPathEffect* pe0, SkPathEffect* pe1)
17        : fPE0(pe0), fPE1(pe1) {
18    SkASSERT(pe0);
19    SkASSERT(pe1);
20    fPE0->ref();
21    fPE1->ref();
22}
23
24SkPairPathEffect::~SkPairPathEffect() {
25    SkSafeUnref(fPE0);
26    SkSafeUnref(fPE1);
27}
28
29/*
30    Format: [oe0-factory][pe1-factory][pe0-size][pe0-data][pe1-data]
31*/
32void SkPairPathEffect::flatten(SkFlattenableWriteBuffer& buffer) const {
33    this->INHERITED::flatten(buffer);
34    buffer.writeFlattenable(fPE0);
35    buffer.writeFlattenable(fPE1);
36}
37
38SkPairPathEffect::SkPairPathEffect(SkFlattenableReadBuffer& buffer) {
39    fPE0 = (SkPathEffect*)buffer.readFlattenable();
40    fPE1 = (SkPathEffect*)buffer.readFlattenable();
41    // either of these may fail, so we have to check for nulls later on
42}
43
44///////////////////////////////////////////////////////////////////////////////
45
46bool SkComposePathEffect::filterPath(SkPath* dst, const SkPath& src,
47                                     SkScalar* width) {
48    // we may have failed to unflatten these, so we have to check
49    if (!fPE0 || !fPE1) {
50        return false;
51    }
52
53    SkPath          tmp;
54    const SkPath*   ptr = &src;
55
56    if (fPE1->filterPath(&tmp, src, width)) {
57        ptr = &tmp;
58    }
59    return fPE0->filterPath(dst, *ptr, width);
60}
61
62///////////////////////////////////////////////////////////////////////////////
63
64bool SkSumPathEffect::filterPath(SkPath* dst, const SkPath& src,
65                                 SkScalar* width) {
66    // use bit-or so that we always call both, even if the first one succeeds
67    return  fPE0->filterPath(dst, src, width) | fPE1->filterPath(dst, src, width);
68}
69
70///////////////////////////////////////////////////////////////////////////////
71
72#include "SkStroke.h"
73
74SkStrokePathEffect::SkStrokePathEffect(const SkPaint& paint)
75    : fWidth(paint.getStrokeWidth()), fMiter(paint.getStrokeMiter()),
76      fStyle(SkToU8(paint.getStyle())), fJoin(SkToU8(paint.getStrokeJoin())),
77      fCap(SkToU8(paint.getStrokeCap())) {
78}
79
80SkStrokePathEffect::SkStrokePathEffect(SkScalar width, SkPaint::Style style,
81                           SkPaint::Join join, SkPaint::Cap cap, SkScalar miter)
82        : fWidth(width), fMiter(miter), fStyle(SkToU8(style)),
83          fJoin(SkToU8(join)), fCap(SkToU8(cap)) {
84    if (miter < 0) {  // signal they want the default
85        fMiter = SkIntToScalar(4);
86    }
87}
88
89bool SkStrokePathEffect::filterPath(SkPath* dst, const SkPath& src,
90                                    SkScalar* width) {
91    if (fWidth < 0 || fStyle == SkPaint::kFill_Style) {
92        return false;
93    }
94
95    if (fStyle == SkPaint::kStroke_Style && fWidth == 0) {  // hairline
96        *width = 0;
97        return true;
98    }
99
100    SkStroke    stroke;
101
102    stroke.setWidth(fWidth);
103    stroke.setMiterLimit(fMiter);
104    stroke.setJoin((SkPaint::Join)fJoin);
105    stroke.setCap((SkPaint::Cap)fCap);
106    stroke.setDoFill(fStyle == SkPaint::kStrokeAndFill_Style);
107
108    stroke.strokePath(src, dst);
109    return true;
110}
111
112void SkStrokePathEffect::flatten(SkFlattenableWriteBuffer& buffer) const {
113    this->INHERITED::flatten(buffer);
114    buffer.writeScalar(fWidth);
115    buffer.writeScalar(fMiter);
116    buffer.write8(fStyle);
117    buffer.write8(fJoin);
118    buffer.write8(fCap);
119}
120
121SkStrokePathEffect::SkStrokePathEffect(SkFlattenableReadBuffer& buffer) {
122    fWidth = buffer.readScalar();
123    fMiter = buffer.readScalar();
124    fStyle = buffer.readU8();
125    fJoin = buffer.readU8();
126    fCap = buffer.readU8();
127}
128
129///////////////////////////////////////////////////////////////////////////////
130
131SK_DEFINE_FLATTENABLE_REGISTRAR(SkComposePathEffect)
132SK_DEFINE_FLATTENABLE_REGISTRAR(SkStrokePathEffect)
133SK_DEFINE_FLATTENABLE_REGISTRAR(SkSumPathEffect)
134
135