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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPathEffect.h"
#include "SkPath.h"
#include "SkBuffer.h"
///////////////////////////////////////////////////////////////////////////////
SkPairPathEffect::SkPairPathEffect(SkPathEffect* pe0, SkPathEffect* pe1)
: fPE0(pe0), fPE1(pe1) {
SkASSERT(pe0);
SkASSERT(pe1);
fPE0->ref();
fPE1->ref();
}
SkPairPathEffect::~SkPairPathEffect() {
SkSafeUnref(fPE0);
SkSafeUnref(fPE1);
}
/*
Format: [oe0-factory][pe1-factory][pe0-size][pe0-data][pe1-data]
*/
void SkPairPathEffect::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeFlattenable(fPE0);
buffer.writeFlattenable(fPE1);
}
SkPairPathEffect::SkPairPathEffect(SkFlattenableReadBuffer& buffer) {
fPE0 = (SkPathEffect*)buffer.readFlattenable();
fPE1 = (SkPathEffect*)buffer.readFlattenable();
// either of these may fail, so we have to check for nulls later on
}
///////////////////////////////////////////////////////////////////////////////
bool SkComposePathEffect::filterPath(SkPath* dst, const SkPath& src,
SkScalar* width) {
// we may have failed to unflatten these, so we have to check
if (!fPE0 || !fPE1) {
return false;
}
SkPath tmp;
const SkPath* ptr = &src;
if (fPE1->filterPath(&tmp, src, width)) {
ptr = &tmp;
}
return fPE0->filterPath(dst, *ptr, width);
}
///////////////////////////////////////////////////////////////////////////////
bool SkSumPathEffect::filterPath(SkPath* dst, const SkPath& src,
SkScalar* width) {
// use bit-or so that we always call both, even if the first one succeeds
return fPE0->filterPath(dst, src, width) | fPE1->filterPath(dst, src, width);
}
///////////////////////////////////////////////////////////////////////////////
#include "SkStroke.h"
/** \class SkStrokePathEffect
SkStrokePathEffect simulates stroking inside a patheffect, allowing the
caller to have explicit control of when to stroke a path. Typically this is
used if the caller wants to stroke before another patheffect is applied
(using SkComposePathEffect or SkSumPathEffect).
*/
class SkStrokePathEffect : public SkPathEffect {
public:
SkStrokePathEffect(const SkPaint&);
SkStrokePathEffect(SkScalar width, SkPaint::Style, SkPaint::Join,
SkPaint::Cap, SkScalar miterLimit = -1);
// overrides
virtual bool filterPath(SkPath* dst, const SkPath& src, SkScalar* width);
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkStrokePathEffect)
protected:
SkStrokePathEffect(SkFlattenableReadBuffer&);
virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
private:
SkScalar fWidth, fMiter;
uint8_t fStyle, fJoin, fCap;
typedef SkPathEffect INHERITED;
// illegal
SkStrokePathEffect(const SkStrokePathEffect&);
SkStrokePathEffect& operator=(const SkStrokePathEffect&);
};
SkStrokePathEffect::SkStrokePathEffect(const SkPaint& paint)
: fWidth(paint.getStrokeWidth()), fMiter(paint.getStrokeMiter()),
fStyle(SkToU8(paint.getStyle())), fJoin(SkToU8(paint.getStrokeJoin())),
fCap(SkToU8(paint.getStrokeCap())) {
}
SkStrokePathEffect::SkStrokePathEffect(SkScalar width, SkPaint::Style style,
SkPaint::Join join, SkPaint::Cap cap, SkScalar miter)
: fWidth(width), fMiter(miter), fStyle(SkToU8(style)),
fJoin(SkToU8(join)), fCap(SkToU8(cap)) {
if (miter < 0) { // signal they want the default
fMiter = SkIntToScalar(4);
}
}
bool SkStrokePathEffect::filterPath(SkPath* dst, const SkPath& src,
SkScalar* width) {
if (fWidth < 0 || fStyle == SkPaint::kFill_Style) {
return false;
}
if (fStyle == SkPaint::kStroke_Style && fWidth == 0) { // hairline
*width = 0;
return true;
}
SkStroke stroke;
stroke.setWidth(fWidth);
stroke.setMiterLimit(fMiter);
stroke.setJoin((SkPaint::Join)fJoin);
stroke.setCap((SkPaint::Cap)fCap);
stroke.setDoFill(fStyle == SkPaint::kStrokeAndFill_Style);
stroke.strokePath(src, dst);
return true;
}
void SkStrokePathEffect::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeScalar(fWidth);
buffer.writeScalar(fMiter);
buffer.write8(fStyle);
buffer.write8(fJoin);
buffer.write8(fCap);
}
SkStrokePathEffect::SkStrokePathEffect(SkFlattenableReadBuffer& buffer) {
fWidth = buffer.readScalar();
fMiter = buffer.readScalar();
fStyle = buffer.readU8();
fJoin = buffer.readU8();
fCap = buffer.readU8();
}
///////////////////////////////////////////////////////////////////////////////
SK_DEFINE_FLATTENABLE_REGISTRAR(SkComposePathEffect)
//SK_DEFINE_FLATTENABLE_REGISTRAR(SkStrokePathEffect)
SK_DEFINE_FLATTENABLE_REGISTRAR(SkSumPathEffect)
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