MatrixTransformOperation.cpp   [plain text]

/*
 * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
 * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "MatrixTransformOperation.h"

#include "TextStream.h"
#include <algorithm>

namespace WebCore {

bool MatrixTransformOperation::operator==(const TransformOperation& other) const
{
    if (!isSameType(other))
        return false;
    const MatrixTransformOperation& m = downcast<MatrixTransformOperation>(other);
    return m_a == m.m_a && m_b == m.m_b && m_c == m.m_c && m_d == m.m_d && m_e == m.m_e && m_f == m.m_f;
}

static Ref<TransformOperation> createOperation(TransformationMatrix& to, TransformationMatrix& from, double progress)
{
    to.blend(from, progress);
    return MatrixTransformOperation::create(to);
}

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

    // convert the TransformOperations into matrices
    TransformationMatrix fromT;
    TransformationMatrix toT(m_a, m_b, m_c, m_d, m_e, m_f);
    if (from) {
        const MatrixTransformOperation& m = downcast<MatrixTransformOperation>(*from);
        fromT.setMatrix(m.m_a, m.m_b, m.m_c, m.m_d, m.m_e, m.m_f);
    }

    if (blendToIdentity)
        return createOperation(fromT, toT, progress);
    return createOperation(toT, fromT, progress);
}

void MatrixTransformOperation::dump(TextStream& ts) const
{
    ts << "("
        << TextStream::FormatNumberRespectingIntegers(m_a) << ", "
        << TextStream::FormatNumberRespectingIntegers(m_b) << ", "
        << TextStream::FormatNumberRespectingIntegers(m_c) << ", "
        << TextStream::FormatNumberRespectingIntegers(m_d) << ", "
        << TextStream::FormatNumberRespectingIntegers(m_e) << ", "
        << TextStream::FormatNumberRespectingIntegers(m_f) << ")";
}

} // namespace WebCore