SkPathEffect.cpp revision aefdd062717dd6182e0f87d727c807af4314d445 
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) {
33    buffer.writeFlattenable(fPE0);
34    buffer.writeFlattenable(fPE1);
35}
36
37SkPairPathEffect::SkPairPathEffect(SkFlattenableReadBuffer& buffer) {
38    fPE0 = (SkPathEffect*)buffer.readFlattenable();
39    fPE1 = (SkPathEffect*)buffer.readFlattenable();
40    // either of these may fail, so we have to check for nulls later on
41}
42
43///////////////////////////////////////////////////////////////////////////////
44
45bool SkComposePathEffect::filterPath(SkPath* dst, const SkPath& src,
46                                     SkScalar* width) {
47    // we may have failed to unflatten these, so we have to check
48    if (!fPE0 || !fPE1) {
49        return false;
50    }
51
52    SkPath          tmp;
53    const SkPath*   ptr = &src;
54
55    if (fPE1->filterPath(&tmp, src, width)) {
56        ptr = &tmp;
57    }
58    return fPE0->filterPath(dst, *ptr, width);
59}
60
61///////////////////////////////////////////////////////////////////////////////
62
63bool SkSumPathEffect::filterPath(SkPath* dst, const SkPath& src,
64                                 SkScalar* width) {
65    // use bit-or so that we always call both, even if the first one succeeds
66    return  fPE0->filterPath(dst, src, width) | fPE1->filterPath(dst, src, width);
67}
68
69///////////////////////////////////////////////////////////////////////////////
70
71#include "SkStroke.h"
72
73SkStrokePathEffect::SkStrokePathEffect(const SkPaint& paint)
74    : fWidth(paint.getStrokeWidth()), fMiter(paint.getStrokeMiter()),
75      fStyle(SkToU8(paint.getStyle())), fJoin(SkToU8(paint.getStrokeJoin())),
76      fCap(SkToU8(paint.getStrokeCap())) {
77}
78
79SkStrokePathEffect::SkStrokePathEffect(SkScalar width, SkPaint::Style style,
80                           SkPaint::Join join, SkPaint::Cap cap, SkScalar miter)
81        : fWidth(width), fMiter(miter), fStyle(SkToU8(style)),
82          fJoin(SkToU8(join)), fCap(SkToU8(cap)) {
83    if (miter < 0) {  // signal they want the default
84        fMiter = SkIntToScalar(4);
85    }
86}
87
88bool SkStrokePathEffect::filterPath(SkPath* dst, const SkPath& src,
89                                    SkScalar* width) {
90    if (fWidth < 0 || fStyle == SkPaint::kFill_Style) {
91        return false;
92    }
93
94    if (fStyle == SkPaint::kStroke_Style && fWidth == 0) {  // hairline
95        *width = 0;
96        return true;
97    }
98
99    SkStroke    stroke;
100
101    stroke.setWidth(fWidth);
102    stroke.setMiterLimit(fMiter);
103    stroke.setJoin((SkPaint::Join)fJoin);
104    stroke.setCap((SkPaint::Cap)fCap);
105    stroke.setDoFill(fStyle == SkPaint::kStrokeAndFill_Style);
106
107    stroke.strokePath(src, dst);
108    return true;
109}
110
111SkFlattenable::Factory SkStrokePathEffect::getFactory() {
112    return CreateProc;
113}
114
115SkFlattenable* SkStrokePathEffect::CreateProc(SkFlattenableReadBuffer& buffer) {
116    return SkNEW_ARGS(SkStrokePathEffect, (buffer));
117}
118
119void SkStrokePathEffect::flatten(SkFlattenableWriteBuffer& buffer) {
120    buffer.writeScalar(fWidth);
121    buffer.writeScalar(fMiter);
122    buffer.write8(fStyle);
123    buffer.write8(fJoin);
124    buffer.write8(fCap);
125}
126
127SkStrokePathEffect::SkStrokePathEffect(SkFlattenableReadBuffer& buffer) {
128    fWidth = buffer.readScalar();
129    fMiter = buffer.readScalar();
130    fStyle = buffer.readU8();
131    fJoin = buffer.readU8();
132    fCap = buffer.readU8();
133}
134
135///////////////////////////////////////////////////////////////////////////////
136
137SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkPathEffect)
138    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkComposePathEffect)
139    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkStrokePathEffect)
140    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSumPathEffect)
141SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
142
143