Sk2DPathEffect.cpp revision 0e747d6d0a794242bd214fa44a6a179baeadfdf9 
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    SkIRect                 ir;
49
50    src.transform(fInverse, &tmp);
51    tmp.getBounds().round(&ir);
52    if (!ir.isEmpty()) {
53        // need to pass a clip to fillpath, required for inverse filltypes,
54        // even though those do not make sense for this patheffect
55        SkRegion clip(ir);
56
57        this->begin(ir, dst);
58        SkScan::FillPath(tmp, clip, &blitter);
59        this->end(dst);
60    }
61    return true;
62}
63
64void Sk2DPathEffect::nextSpan(int x, int y, int count, SkPath* path)
65{
66    const SkMatrix& mat = this->getMatrix();
67    SkPoint src, dst;
68
69    src.set(SkIntToScalar(x) + SK_ScalarHalf, SkIntToScalar(y) + SK_ScalarHalf);
70    do {
71        mat.mapPoints(&dst, &src, 1);
72        this->next(dst, x++, y, path);
73        src.fX += SK_Scalar1;
74    } while (--count > 0);
75}
76
77void Sk2DPathEffect::begin(const SkIRect& uvBounds, SkPath* dst) {}
78void Sk2DPathEffect::next(const SkPoint& loc, int u, int v, SkPath* dst) {}
79void Sk2DPathEffect::end(SkPath* dst) {}
80
81////////////////////////////////////////////////////////////////////////////////
82
83void Sk2DPathEffect::flatten(SkFlattenableWriteBuffer& buffer)
84{
85    buffer.writeMul4(&fMatrix, sizeof(fMatrix));
86}
87
88Sk2DPathEffect::Sk2DPathEffect(SkFlattenableReadBuffer& buffer)
89{
90    buffer.read(&fMatrix, sizeof(fMatrix));
91    fMatrix.invert(&fInverse);
92}
93
94SkFlattenable::Factory Sk2DPathEffect::getFactory()
95{
96    return CreateProc;
97}
98
99SkFlattenable* Sk2DPathEffect::CreateProc(SkFlattenableReadBuffer& buffer)
100{
101    return SkNEW_ARGS(Sk2DPathEffect, (buffer));
102}
103
104
105
106