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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 "SkSGMerge.h"
#include "SkCanvas.h"
#include "SkPathOps.h"
namespace sksg {
Merge::Merge(std::vector<sk_sp<GeometryNode>>&& geos, Mode mode)
: fGeos(std::move(geos))
, fMode(mode) {
for (const auto& geo : fGeos) {
geo->addInvalReceiver(this);
}
}
Merge::~Merge() {
for (const auto& geo : fGeos) {
geo->removeInvalReceiver(this);
}
}
void Merge::onDraw(SkCanvas* canvas, const SkPaint& paint) const {
canvas->drawPath(fMerged, paint);
}
SkPath Merge::onAsPath() const {
return fMerged;
}
static SkPathOp mode_to_op(Merge::Mode mode) {
switch (mode) {
case Merge::Mode::kUnion:
return kUnion_SkPathOp;
case Merge::Mode::kIntersect:
return kIntersect_SkPathOp;
case Merge::Mode::kDifference:
return kDifference_SkPathOp;
case Merge::Mode::kReverseDifference:
return kReverseDifference_SkPathOp;
case Merge::Mode::kXOR:
return kXOR_SkPathOp;
default:
break;
}
return kUnion_SkPathOp;
}
SkRect Merge::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) {
SkASSERT(this->hasInval());
const auto op = mode_to_op(fMode);
SkOpBuilder builder;
fMerged.reset();
for (const auto& geo : fGeos) {
geo->revalidate(ic, ctm);
if (fMode == Mode::kMerge) {
fMerged.addPath(geo->asPath());
} else {
builder.add(geo->asPath(), geo == fGeos.front() ? kUnion_SkPathOp : op);
}
}
if (fMode != Mode::kMerge) {
builder.resolve(&fMerged);
}
return fMerged.computeTightBounds();
}
} // namespace sksg
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