| /* |
| * 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 COMPUTER, 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 "platform/transforms/PerspectiveTransformOperation.h" |
| |
| #include "platform/animation/AnimationUtilities.h" |
| #include "wtf/MathExtras.h" |
| |
| namespace blink { |
| |
| PassRefPtr<TransformOperation> PerspectiveTransformOperation::blend( |
| const TransformOperation* from, |
| double progress, |
| bool blendToIdentity) { |
| if (from && !from->isSameType(*this)) |
| return this; |
| |
| if (blendToIdentity) { |
| // FIXME: this seems wrong. https://bugs.webkit.org/show_bug.cgi?id=52700 |
| double p = blink::blend(m_p, 1., progress); |
| return PerspectiveTransformOperation::create(clampTo<int>(p, 0)); |
| } |
| |
| const PerspectiveTransformOperation* fromOp = |
| static_cast<const PerspectiveTransformOperation*>(from); |
| |
| TransformationMatrix fromT; |
| TransformationMatrix toT; |
| fromT.applyPerspective(fromOp ? fromOp->m_p : 0); |
| toT.applyPerspective(m_p); |
| toT.blend(fromT, progress); |
| |
| TransformationMatrix::DecomposedType decomp; |
| if (!toT.decompose(decomp)) { |
| // If we can't decompose, bail out of interpolation. |
| const PerspectiveTransformOperation* usedOperation = |
| progress > 0.5 ? this : fromOp; |
| return PerspectiveTransformOperation::create(usedOperation->perspective()); |
| } |
| |
| if (decomp.perspectiveZ) { |
| double val = -1.0 / decomp.perspectiveZ; |
| return PerspectiveTransformOperation::create(clampTo<int>(val, 0)); |
| } |
| return PerspectiveTransformOperation::create(0); |
| } |
| |
| PassRefPtr<TransformOperation> PerspectiveTransformOperation::zoom( |
| double factor) { |
| return create(m_p * factor); |
| } |
| |
| } // namespace blink |