| /* |
| * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann |
| * <zimmermann@kde.org> |
| * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org> |
| * Copyright (C) 2007 Eric Seidel <eric@webkit.org> |
| * Copyright (C) Research In Motion Limited 2010. 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 "core/svg/SVGPathQuery.h" |
| |
| #include "core/svg/SVGPathByteStreamSource.h" |
| #include "core/svg/SVGPathConsumer.h" |
| #include "core/svg/SVGPathData.h" |
| #include "core/svg/SVGPathParser.h" |
| #include "platform/graphics/PathTraversalState.h" |
| |
| namespace blink { |
| |
| namespace { |
| |
| class SVGPathTraversalState final : public SVGPathConsumer { |
| public: |
| SVGPathTraversalState(PathTraversalState::PathTraversalAction traversalAction, |
| float desiredLength = 0) |
| : m_traversalState(traversalAction), m_segmentIndex(0) { |
| m_traversalState.m_desiredLength = desiredLength; |
| } |
| |
| unsigned segmentIndex() const { return m_segmentIndex; } |
| float totalLength() const { return m_traversalState.m_totalLength; } |
| FloatPoint computedPoint() const { return m_traversalState.m_current; } |
| |
| bool processSegment(bool hasMoreData) { |
| m_traversalState.processSegment(); |
| if (m_traversalState.m_success) |
| return true; |
| if (hasMoreData) |
| m_segmentIndex++; |
| return false; |
| } |
| |
| private: |
| void emitSegment(const PathSegmentData&) override; |
| |
| PathTraversalState m_traversalState; |
| unsigned m_segmentIndex; |
| }; |
| |
| void SVGPathTraversalState::emitSegment(const PathSegmentData& segment) { |
| switch (segment.command) { |
| case PathSegMoveToAbs: |
| m_traversalState.m_totalLength += |
| m_traversalState.moveTo(segment.targetPoint); |
| break; |
| case PathSegLineToAbs: |
| m_traversalState.m_totalLength += |
| m_traversalState.lineTo(segment.targetPoint); |
| break; |
| case PathSegClosePath: |
| m_traversalState.m_totalLength += m_traversalState.closeSubpath(); |
| break; |
| case PathSegCurveToCubicAbs: |
| m_traversalState.m_totalLength += m_traversalState.cubicBezierTo( |
| segment.point1, segment.point2, segment.targetPoint); |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| } |
| |
| void executeQuery(const SVGPathByteStream& pathByteStream, |
| SVGPathTraversalState& traversalState) { |
| SVGPathByteStreamSource source(pathByteStream); |
| SVGPathNormalizer normalizer(&traversalState); |
| |
| bool hasMoreData = source.hasMoreData(); |
| while (hasMoreData) { |
| PathSegmentData segment = source.parseSegment(); |
| ASSERT(segment.command != PathSegUnknown); |
| |
| normalizer.emitSegment(segment); |
| |
| hasMoreData = source.hasMoreData(); |
| if (traversalState.processSegment(hasMoreData)) |
| break; |
| } |
| } |
| |
| } // namespace |
| |
| SVGPathQuery::SVGPathQuery(const SVGPathByteStream& pathByteStream) |
| : m_pathByteStream(pathByteStream) {} |
| |
| unsigned SVGPathQuery::getPathSegIndexAtLength(float length) const { |
| SVGPathTraversalState traversalState( |
| PathTraversalState::TraversalSegmentAtLength, length); |
| executeQuery(m_pathByteStream, traversalState); |
| return traversalState.segmentIndex(); |
| } |
| |
| float SVGPathQuery::getTotalLength() const { |
| SVGPathTraversalState traversalState( |
| PathTraversalState::TraversalTotalLength); |
| executeQuery(m_pathByteStream, traversalState); |
| return traversalState.totalLength(); |
| } |
| |
| FloatPoint SVGPathQuery::getPointAtLength(float length) const { |
| SVGPathTraversalState traversalState( |
| PathTraversalState::TraversalPointAtLength, length); |
| executeQuery(m_pathByteStream, traversalState); |
| return traversalState.computedPoint(); |
| } |
| |
| } // namespace blink |