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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkSGTrimEffect.h"
#include "SkCanvas.h"
#include "SkStrokeRec.h"
#include "SkTrimPathEffect.h"
namespace sksg {
TrimEffect::TrimEffect(sk_sp<GeometryNode> child)
: fChild(std::move(child)) {
this->observeInval(fChild);
}
TrimEffect::~TrimEffect() {
this->unobserveInval(fChild);
}
void TrimEffect::onClip(SkCanvas* canvas, bool antiAlias) const {
canvas->clipPath(fTrimmedPath, SkClipOp::kIntersect, antiAlias);
}
void TrimEffect::onDraw(SkCanvas* canvas, const SkPaint& paint) const {
SkASSERT(!paint.getPathEffect());
canvas->drawPath(fTrimmedPath, paint);
}
SkPath TrimEffect::onAsPath() const {
return fTrimmedPath;
}
SkRect TrimEffect::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) {
SkASSERT(this->hasInval());
const auto childbounds = fChild->revalidate(ic, ctm);
const auto path = fChild->asPath();
// TODO: relocate these funky semantics to a Skottie composite helper,
// and refactor TrimEffect as a thin SkTrimpPathEffect wrapper.
auto start = SkTMin(fStart, fEnd) + fOffset,
stop = SkTMax(fStart, fEnd) + fOffset;
sk_sp<SkPathEffect> trim;
if (stop - start < 1) {
start -= SkScalarFloorToScalar(start);
stop -= SkScalarFloorToScalar(stop);
trim = start <= stop
? SkTrimPathEffect::Make(start, stop, SkTrimPathEffect::Mode::kNormal)
: SkTrimPathEffect::Make(stop, start, SkTrimPathEffect::Mode::kInverted);
}
if (trim) {
fTrimmedPath.reset();
SkStrokeRec rec(SkStrokeRec::kHairline_InitStyle);
SkAssertResult(trim->filterPath(&fTrimmedPath, path, &rec, &childbounds));
} else {
fTrimmedPath = path;
}
return fTrimmedPath.computeTightBounds();
}
} // namespace sksg
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