| /* |
| * Copyright (C) 2009 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "PerspectiveTransformOperation.h" |
| |
| #include "AnimationUtilities.h" |
| #include <wtf/MathExtras.h> |
| #include <wtf/text/TextStream.h> |
| |
| namespace WebCore { |
| |
| bool PerspectiveTransformOperation::operator==(const TransformOperation& other) const |
| { |
| if (!isSameType(other)) |
| return false; |
| return m_p == downcast<PerspectiveTransformOperation>(other).m_p; |
| } |
| |
| Ref<TransformOperation> PerspectiveTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity) |
| { |
| if (from && !from->isSameType(*this)) |
| return *this; |
| |
| if (blendToIdentity) { |
| double p = floatValueForLength(m_p, 1); |
| p = WebCore::blend(p, 1.0, progress); // FIXME: this seems wrong. https://bugs.webkit.org/show_bug.cgi?id=52700 |
| return PerspectiveTransformOperation::create(Length(clampToPositiveInteger(p), Fixed)); |
| } |
| |
| const PerspectiveTransformOperation* fromOp = downcast<PerspectiveTransformOperation>(from); |
| Length fromP = fromOp ? fromOp->m_p : Length(m_p.type()); |
| Length toP = m_p; |
| |
| TransformationMatrix fromT; |
| TransformationMatrix toT; |
| fromT.applyPerspective(floatValueForLength(fromP, 1)); |
| toT.applyPerspective(floatValueForLength(toP, 1)); |
| toT.blend(fromT, progress); |
| TransformationMatrix::Decomposed4Type decomp; |
| toT.decompose4(decomp); |
| |
| if (decomp.perspectiveZ) { |
| double val = -1.0 / decomp.perspectiveZ; |
| return PerspectiveTransformOperation::create(Length(clampToPositiveInteger(val), Fixed)); |
| } |
| return PerspectiveTransformOperation::create(Length(0, Fixed)); |
| } |
| |
| void PerspectiveTransformOperation::dump(TextStream& ts) const |
| { |
| ts << type() << "(" << m_p << ")"; |
| } |
| |
| } // namespace WebCore |