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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/animation/animatable/AnimatablePath.h"
#include "core/style/DataEquivalency.h"
#include "core/svg/SVGPathBlender.h"
#include "core/svg/SVGPathByteStreamBuilder.h"
#include "core/svg/SVGPathByteStreamSource.h"
#include <memory>
namespace blink {
bool AnimatablePath::usesDefaultInterpolationWith(
const AnimatableValue* value) const {
// Default interpolation is used if the paths have different lengths,
// or the paths have a segment with different types (ignoring "relativeness").
const StylePath* toPath = toAnimatablePath(value)->path();
if (!m_path || !toPath)
return true;
SVGPathByteStreamSource fromSource(path()->byteStream());
SVGPathByteStreamSource toSource(toPath->byteStream());
while (fromSource.hasMoreData()) {
if (!toSource.hasMoreData())
return true;
PathSegmentData fromSeg = fromSource.parseSegment();
PathSegmentData toSeg = toSource.parseSegment();
DCHECK_NE(fromSeg.command, PathSegUnknown);
DCHECK_NE(toSeg.command, PathSegUnknown);
if (toAbsolutePathSegType(fromSeg.command) !=
toAbsolutePathSegType(toSeg.command))
return true;
}
return toSource.hasMoreData();
}
PassRefPtr<AnimatableValue> AnimatablePath::interpolateTo(
const AnimatableValue* value,
double fraction) const {
if (usesDefaultInterpolationWith(value))
return defaultInterpolateTo(this, value, fraction);
std::unique_ptr<SVGPathByteStream> byteStream = SVGPathByteStream::create();
SVGPathByteStreamBuilder builder(*byteStream);
SVGPathByteStreamSource fromSource(path()->byteStream());
SVGPathByteStreamSource toSource(
toAnimatablePath(value)->path()->byteStream());
SVGPathBlender blender(&fromSource, &toSource, &builder);
bool ok = blender.blendAnimatedPath(fraction);
ALLOW_UNUSED_LOCAL(ok);
return AnimatablePath::create(StylePath::create(std::move(byteStream)));
}
bool AnimatablePath::equalTo(const AnimatableValue* value) const {
return dataEquivalent(m_path.get(), toAnimatablePath(value)->path());
}
} // namespace blink
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