1 /* 2 * Copyright (C) 2009 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "config.h" 27 #include "core/platform/graphics/transforms/PerspectiveTransformOperation.h" 28 29 #include "core/platform/animation/AnimationUtilities.h" 30 #include "wtf/MathExtras.h" 31 32 using namespace std; 33 34 namespace WebCore { 35 36 PassRefPtr<TransformOperation> PerspectiveTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity) 37 { 38 if (from && !from->isSameType(*this)) 39 return this; 40 41 if (blendToIdentity) { 42 double p = floatValueForLength(m_p, 1); 43 p = WebCore::blend(p, 1.0, progress); // FIXME: this seems wrong. https://bugs.webkit.org/show_bug.cgi?id=52700 44 return PerspectiveTransformOperation::create(Length(clampToPositiveInteger(p), Fixed)); 45 } 46 47 const PerspectiveTransformOperation* fromOp = static_cast<const PerspectiveTransformOperation*>(from); 48 Length fromP = fromOp ? fromOp->m_p : Length(m_p.type()); 49 Length toP = m_p; 50 51 TransformationMatrix fromT; 52 TransformationMatrix toT; 53 fromT.applyPerspective(floatValueForLength(fromP, 1)); 54 toT.applyPerspective(floatValueForLength(toP, 1)); 55 toT.blend(fromT, progress); 56 TransformationMatrix::DecomposedType decomp; 57 toT.decompose(decomp); 58 59 if (decomp.perspectiveZ) { 60 double val = -1.0 / decomp.perspectiveZ; 61 return PerspectiveTransformOperation::create(Length(clampToPositiveInteger(val), Fixed)); 62 } 63 return PerspectiveTransformOperation::create(Length(0, Fixed)); 64 } 65 66 } // namespace WebCore 67
