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/* libs/graphics/effects/Sk2DPathEffect.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include "Sk2DPathEffect.h"
#include "SkBlitter.h"
#include "SkPath.h"
#include "SkScan.h"
class Sk2DPathEffectBlitter : public SkBlitter {
public:
Sk2DPathEffectBlitter(Sk2DPathEffect* pe, SkPath* dst)
: fPE(pe), fDst(dst)
{}
virtual void blitH(int x, int y, int count)
{
fPE->nextSpan(x, y, count, fDst);
}
private:
Sk2DPathEffect* fPE;
SkPath* fDst;
};
////////////////////////////////////////////////////////////////////////////////////
Sk2DPathEffect::Sk2DPathEffect(const SkMatrix& mat) : fMatrix(mat)
{
mat.invert(&fInverse);
}
bool Sk2DPathEffect::filterPath(SkPath* dst, const SkPath& src, SkScalar* width)
{
Sk2DPathEffectBlitter blitter(this, dst);
SkPath tmp;
SkIRect ir;
src.transform(fInverse, &tmp);
tmp.getBounds().round(&ir);
if (!ir.isEmpty()) {
// need to pass a clip to fillpath, required for inverse filltypes,
// even though those do not make sense for this patheffect
SkRegion clip(ir);
this->begin(ir, dst);
SkScan::FillPath(tmp, clip, &blitter);
this->end(dst);
}
return true;
}
void Sk2DPathEffect::nextSpan(int x, int y, int count, SkPath* path)
{
const SkMatrix& mat = this->getMatrix();
SkPoint src, dst;
src.set(SkIntToScalar(x) + SK_ScalarHalf, SkIntToScalar(y) + SK_ScalarHalf);
do {
mat.mapPoints(&dst, &src, 1);
this->next(dst, x++, y, path);
src.fX += SK_Scalar1;
} while (--count > 0);
}
void Sk2DPathEffect::begin(const SkIRect& uvBounds, SkPath* dst) {}
void Sk2DPathEffect::next(const SkPoint& loc, int u, int v, SkPath* dst) {}
void Sk2DPathEffect::end(SkPath* dst) {}
////////////////////////////////////////////////////////////////////////////////
void Sk2DPathEffect::flatten(SkFlattenableWriteBuffer& buffer)
{
char storage[SkMatrix::kMaxFlattenSize];
uint32_t size = fMatrix.flatten(storage);
buffer.write32(size);
buffer.write(storage, size);
}
Sk2DPathEffect::Sk2DPathEffect(SkFlattenableReadBuffer& buffer)
{
char storage[SkMatrix::kMaxFlattenSize];
uint32_t size = buffer.readS32();
SkASSERT(size <= sizeof(storage));
buffer.read(storage, size);
fMatrix.unflatten(storage);
fMatrix.invert(&fInverse);
}
SkFlattenable::Factory Sk2DPathEffect::getFactory()
{
return CreateProc;
}
SkFlattenable* Sk2DPathEffect::CreateProc(SkFlattenableReadBuffer& buffer)
{
return SkNEW_ARGS(Sk2DPathEffect, (buffer));
}
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