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27 #include "platform/transforms/PerspectiveTransformOperation.h"
29 #include "platform/animation/AnimationUtilities.h"
30 #include "wtf/MathExtras.h"
34 PassRefPtr<TransformOperation> PerspectiveTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity)
36 if (from && !from->isSameType(*this))
39 if (blendToIdentity) {
40 double p = blink::blend(m_p, 1., progress); // FIXME: this seems wrong. https://bugs.webkit.org/show_bug.cgi?id=52700
41 return PerspectiveTransformOperation::create(clampToPositiveInteger(p));
44 const PerspectiveTransformOperation* fromOp = static_cast<const PerspectiveTransformOperation*>(from);
46 TransformationMatrix fromT;
47 TransformationMatrix toT;
48 fromT.applyPerspective(fromOp ? fromOp->m_p : 0);
49 toT.applyPerspective(m_p);
50 toT.blend(fromT, progress);
51 TransformationMatrix::DecomposedType decomp;
52 toT.decompose(decomp);
54 if (decomp.perspectiveZ) {
55 double val = -1.0 / decomp.perspectiveZ;
56 return PerspectiveTransformOperation::create(clampToPositiveInteger(val));
58 return PerspectiveTransformOperation::create(0);