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 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 "PerspectiveTransformOperation.h"
28
29#include "AnimationUtilities.h"
30#include <wtf/MathExtras.h>
31#include <wtf/text/TextStream.h>
32
33namespace WebCore {
34
35bool PerspectiveTransformOperation::operator==(const TransformOperation& other) const
36{
37 if (!isSameType(other))
38 return false;
39 return m_p == downcast<PerspectiveTransformOperation>(other).m_p;
40}
41
42Ref<TransformOperation> PerspectiveTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity)
43{
44 if (from && !from->isSameType(*this))
45 return *this;
46
47 if (blendToIdentity) {
48 double p = floatValueForLength(m_p, 1);
49 p = WebCore::blend(p, 1.0, progress); // FIXME: this seems wrong. https://bugs.webkit.org/show_bug.cgi?id=52700
50 return PerspectiveTransformOperation::create(Length(clampToPositiveInteger(p), Fixed));
51 }
52
53 const PerspectiveTransformOperation* fromOp = downcast<PerspectiveTransformOperation>(from);
54 Length fromP = fromOp ? fromOp->m_p : Length(m_p.type());
55 Length toP = m_p;
56
57 TransformationMatrix fromT;
58 TransformationMatrix toT;
59 fromT.applyPerspective(floatValueForLength(fromP, 1));
60 toT.applyPerspective(floatValueForLength(toP, 1));
61 toT.blend(fromT, progress);
62 TransformationMatrix::Decomposed4Type decomp;
63 toT.decompose4(decomp);
64
65 if (decomp.perspectiveZ) {
66 double val = -1.0 / decomp.perspectiveZ;
67 return PerspectiveTransformOperation::create(Length(clampToPositiveInteger(val), Fixed));
68 }
69 return PerspectiveTransformOperation::create(Length(0, Fixed));
70}
71
72void PerspectiveTransformOperation::dump(TextStream& ts) const
73{
74 ts << type() << "(" << m_p << ")";
75}
76
77} // namespace WebCore
78