Sk2DPathEffect.cpp revision 8a1c16ff38322f0210116fa7293eb8817c7e477e 
1/* libs/graphics/effects/Sk2DPathEffect.cpp
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#include "Sk2DPathEffect.h"
19#include "SkBlitter.h"
20#include "SkPath.h"
21#include "SkScan.h"
22
23class Sk2DPathEffectBlitter : public SkBlitter {
24public:
25    Sk2DPathEffectBlitter(Sk2DPathEffect* pe, SkPath* dst)
26        : fPE(pe), fDst(dst)
27    {}
28    virtual void blitH(int x, int y, int count)
29    {
30        fPE->nextSpan(x, y, count, fDst);
31    }
32private:
33    Sk2DPathEffect* fPE;
34    SkPath*         fDst;
35};
36
37////////////////////////////////////////////////////////////////////////////////////
38
39Sk2DPathEffect::Sk2DPathEffect(const SkMatrix& mat) : fMatrix(mat)
40{
41    mat.invert(&fInverse);
42}
43
44bool Sk2DPathEffect::filterPath(SkPath* dst, const SkPath& src, SkScalar* width)
45{
46    Sk2DPathEffectBlitter   blitter(this, dst);
47    SkPath                  tmp;
48    SkRect                  bounds;
49    SkIRect                 ir;
50
51    src.transform(fInverse, &tmp);
52    tmp.computeBounds(&bounds, SkPath::kExact_BoundsType);
53    bounds.round(&ir);
54    if (!ir.isEmpty()) {
55        // need to pass a clip to fillpath, required for inverse filltypes,
56        // even though those do not make sense for this patheffect
57        SkRegion clip(ir);
58
59        this->begin(ir, dst);
60        SkScan::FillPath(tmp, clip, &blitter);
61        this->end(dst);
62    }
63    return true;
64}
65
66void Sk2DPathEffect::nextSpan(int x, int y, int count, SkPath* path)
67{
68    const SkMatrix& mat = this->getMatrix();
69    SkPoint src, dst;
70
71    src.set(SkIntToScalar(x) + SK_ScalarHalf, SkIntToScalar(y) + SK_ScalarHalf);
72    do {
73        mat.mapPoints(&dst, &src, 1);
74        this->next(dst, x++, y, path);
75        src.fX += SK_Scalar1;
76    } while (--count > 0);
77}
78
79void Sk2DPathEffect::begin(const SkIRect& uvBounds, SkPath* dst) {}
80void Sk2DPathEffect::next(const SkPoint& loc, int u, int v, SkPath* dst) {}
81void Sk2DPathEffect::end(SkPath* dst) {}
82
83////////////////////////////////////////////////////////////////////////////////
84
85void Sk2DPathEffect::flatten(SkFlattenableWriteBuffer& buffer)
86{
87    buffer.writeMul4(&fMatrix, sizeof(fMatrix));
88}
89
90Sk2DPathEffect::Sk2DPathEffect(SkFlattenableReadBuffer& buffer)
91{
92    buffer.read(&fMatrix, sizeof(fMatrix));
93    fMatrix.invert(&fInverse);
94}
95
96SkFlattenable::Factory Sk2DPathEffect::getFactory()
97{
98    return CreateProc;
99}
100
101SkFlattenable* Sk2DPathEffect::CreateProc(SkFlattenableReadBuffer& buffer)
102{
103    return SkNEW_ARGS(Sk2DPathEffect, (buffer));
104}
105
106
107
108