sky/engine/platform/transforms/InterpolatedTransformOperation.cpp

/*
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#include "sky/engine/platform/transforms/InterpolatedTransformOperation.h"

#include "sky/engine/platform/transforms/IdentityTransformOperation.h"

namespace blink {

bool InterpolatedTransformOperation::operator==(const TransformOperation& o) const
{
    if (!isSameType(o))
        return false;
    const InterpolatedTransformOperation* t = static_cast<const InterpolatedTransformOperation*>(&o);
    return progress == t->progress && from == t->from && to == t->to;
}

void InterpolatedTransformOperation::apply(TransformationMatrix& transform, const FloatSize& borderBoxSize) const
{
    TransformationMatrix fromTransform;
    TransformationMatrix toTransform;
    from.apply(borderBoxSize, fromTransform);
    to.apply(borderBoxSize, toTransform);

    toTransform.blend(fromTransform, progress);
    transform.multiply(toTransform);
}

PassRefPtr<TransformOperation> InterpolatedTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity)
{
    if (from && !from->isSameType(*this))
        return this;

    TransformOperations thisOperations;
    thisOperations.operations().append(this);
    TransformOperations fromOperations;
    if (blendToIdentity)
        fromOperations.operations().append(IdentityTransformOperation::create());
    else
        fromOperations.operations().append(const_cast<TransformOperation*>(from));
    return InterpolatedTransformOperation::create(thisOperations, fromOperations, progress);
}

} // namespace blink