| /* |
| * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "config.h" |
| #include "RotateTransformOperation.h" |
| |
| #include "AnimationUtilities.h" |
| #include <algorithm> |
| #include <wtf/MathExtras.h> |
| #include <wtf/text/TextStream.h> |
| |
| namespace WebCore { |
| |
| bool RotateTransformOperation::operator==(const TransformOperation& other) const |
| { |
| if (!isSameType(other)) |
| return false; |
| const RotateTransformOperation& r = downcast<RotateTransformOperation>(other); |
| return m_x == r.m_x && m_y == r.m_y && m_z == r.m_z && m_angle == r.m_angle; |
| } |
| |
| Ref<TransformOperation> RotateTransformOperation::blend(const TransformOperation* from, const BlendingContext& context, bool blendToIdentity) |
| { |
| if (blendToIdentity) { |
| if (context.compositeOperation == CompositeOperation::Accumulate) |
| return RotateTransformOperation::create(m_x, m_y, m_z, m_angle, type()); |
| return RotateTransformOperation::create(m_x, m_y, m_z, m_angle - m_angle * context.progress, type()); |
| } |
| auto outputType = sharedPrimitiveType(from); |
| if (!outputType) |
| return *this; |
| |
| const RotateTransformOperation* fromOp = downcast<RotateTransformOperation>(from); |
| const RotateTransformOperation* toOp = this; |
| |
| // Interpolation of primitives and derived transform functions |
| // |
| // https://drafts.csswg.org/css-transforms-2/#interpolation-of-transform-functions |
| // |
| // For interpolations with the primitive rotate3d(), the direction vectors of the transform functions get |
| // normalized first. If the normalized vectors are not equal and both rotation angles are non-zero the transform |
| // functions get converted into 4x4 matrices first and interpolated as defined in section Interpolation of Matrices |
| // afterwards. Otherwise the rotation angle gets interpolated numerically and the rotation vector of the non-zero |
| // angle is used or (0, 0, 1) if both angles are zero. |
| |
| auto normalizedVector = [](const RotateTransformOperation& op) -> FloatPoint3D { |
| auto length = std::hypot(op.m_x, op.m_y, op.m_z); |
| return { static_cast<float>(op.m_x / length), static_cast<float>(op.m_y / length), static_cast<float>(op.m_z / length) }; |
| }; |
| |
| double fromAngle = fromOp ? fromOp->m_angle : 0.0; |
| double toAngle = toOp->m_angle; |
| auto fromNormalizedVector = fromOp ? normalizedVector(*fromOp) : FloatPoint3D(0, 0, 1); |
| auto toNormalizedVector = normalizedVector(*toOp); |
| if (!fromAngle || !toAngle || fromNormalizedVector == toNormalizedVector) { |
| auto vector = (!fromAngle && toAngle) ? toNormalizedVector : fromNormalizedVector; |
| return RotateTransformOperation::create(vector.x(), vector.y(), vector.z(), WebCore::blend(fromAngle, toAngle, context), *outputType); |
| } |
| |
| // Create the 2 rotation matrices |
| TransformationMatrix fromT; |
| TransformationMatrix toT; |
| fromT.rotate3d((fromOp ? fromOp->m_x : 0), |
| (fromOp ? fromOp->m_y : 0), |
| (fromOp ? fromOp->m_z : 1), |
| (fromOp ? fromOp->m_angle : 0)); |
| |
| toT.rotate3d((toOp ? toOp->m_x : 0), |
| (toOp ? toOp->m_y : 0), |
| (toOp ? toOp->m_z : 1), |
| (toOp ? toOp->m_angle : 0)); |
| |
| // Blend them |
| toT.blend(fromT, context.progress, context.compositeOperation); |
| |
| // Extract the result as a quaternion |
| TransformationMatrix::Decomposed4Type decomp; |
| toT.decompose4(decomp); |
| |
| // Convert that to Axis/Angle form |
| double x = -decomp.quaternionX; |
| double y = -decomp.quaternionY; |
| double z = -decomp.quaternionZ; |
| double length = std::hypot(x, y, z); |
| double angle = 0; |
| |
| if (length > 0.00001) { |
| x /= length; |
| y /= length; |
| z /= length; |
| angle = rad2deg(acos(decomp.quaternionW) * 2); |
| } else { |
| x = 0; |
| y = 0; |
| z = 1; |
| } |
| return RotateTransformOperation::create(x, y, z, angle, ROTATE_3D); |
| } |
| |
| void RotateTransformOperation::dump(TextStream& ts) const |
| { |
| ts << type() << "(" << TextStream::FormatNumberRespectingIntegers(m_x) << ", " << TextStream::FormatNumberRespectingIntegers(m_y) << ", " << TextStream::FormatNumberRespectingIntegers(m_z) << ", " << TextStream::FormatNumberRespectingIntegers(m_angle) << "deg)"; |
| } |
| |
| } // namespace WebCore |