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/*
* 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 "third_party/blink/renderer/platform/transforms/perspective_transform_operation.h"
#include "third_party/blink/renderer/platform/geometry/blend.h"
#include "third_party/blink/renderer/platform/wtf/math_extras.h"
namespace blink {
scoped_refptr<TransformOperation> PerspectiveTransformOperation::Blend(
const TransformOperation* from,
double progress,
bool blend_to_identity) {
if (from && !from->IsSameType(*this))
return this;
if (blend_to_identity) {
// FIXME: this seems wrong. https://bugs.webkit.org/show_bug.cgi?id=52700
double p = blink::Blend(p_, 1., progress);
return PerspectiveTransformOperation::Create(clampTo<int>(p, 0));
}
const PerspectiveTransformOperation* from_op =
static_cast<const PerspectiveTransformOperation*>(from);
TransformationMatrix from_t;
TransformationMatrix to_t;
from_t.ApplyPerspective(from_op ? from_op->p_ : 0);
to_t.ApplyPerspective(p_);
to_t.Blend(from_t, progress);
TransformationMatrix::DecomposedType decomp;
if (!to_t.Decompose(decomp)) {
// If we can't decompose, bail out of interpolation.
const PerspectiveTransformOperation* used_operation =
progress > 0.5 ? this : from_op;
return PerspectiveTransformOperation::Create(used_operation->Perspective());
}
if (decomp.perspective_z) {
double val = -1.0 / decomp.perspective_z;
return PerspectiveTransformOperation::Create(clampTo<int>(val, 0));
}
return PerspectiveTransformOperation::Create(0);
}
scoped_refptr<TransformOperation> PerspectiveTransformOperation::Zoom(
double factor) {
return Create(p_ * factor);
}
} // namespace blink
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