| /* |
| * 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. |
| */ |
| |
| #ifndef SVGMarkerData_h |
| #define SVGMarkerData_h |
| |
| #include "platform/graphics/Path.h" |
| #include "wtf/Allocator.h" |
| #include "wtf/MathExtras.h" |
| |
| namespace blink { |
| |
| enum SVGMarkerType { StartMarker, MidMarker, EndMarker }; |
| |
| struct MarkerPosition { |
| DISALLOW_NEW_EXCEPT_PLACEMENT_NEW(); |
| MarkerPosition(SVGMarkerType useType, |
| const FloatPoint& useOrigin, |
| float useAngle) |
| : type(useType), origin(useOrigin), angle(useAngle) {} |
| |
| SVGMarkerType type; |
| FloatPoint origin; |
| float angle; |
| }; |
| |
| class LayoutSVGResourceMarker; |
| |
| class SVGMarkerData { |
| STACK_ALLOCATED(); |
| |
| public: |
| SVGMarkerData(Vector<MarkerPosition>& positions, bool autoStartReverse) |
| : m_positions(positions), |
| m_elementIndex(0), |
| m_autoStartReverse(autoStartReverse) {} |
| |
| static void updateFromPathElement(void* info, const PathElement* element) { |
| SVGMarkerData* markerData = static_cast<SVGMarkerData*>(info); |
| |
| // First update the outslope for the previous element. |
| markerData->updateOutslope(element->points[0]); |
| |
| // Record the marker for the previous element. |
| if (markerData->m_elementIndex > 0) { |
| SVGMarkerType markerType = |
| markerData->m_elementIndex == 1 ? StartMarker : MidMarker; |
| markerData->m_positions.append( |
| MarkerPosition(markerType, markerData->m_origin, |
| markerData->currentAngle(markerType))); |
| } |
| |
| // Update our marker data for this element. |
| markerData->updateMarkerDataForPathElement(element); |
| ++markerData->m_elementIndex; |
| } |
| |
| void pathIsDone() { |
| m_positions.append( |
| MarkerPosition(EndMarker, m_origin, currentAngle(EndMarker))); |
| } |
| |
| static inline LayoutSVGResourceMarker* markerForType( |
| const SVGMarkerType& type, |
| LayoutSVGResourceMarker* markerStart, |
| LayoutSVGResourceMarker* markerMid, |
| LayoutSVGResourceMarker* markerEnd) { |
| switch (type) { |
| case StartMarker: |
| return markerStart; |
| case MidMarker: |
| return markerMid; |
| case EndMarker: |
| return markerEnd; |
| } |
| |
| ASSERT_NOT_REACHED(); |
| return nullptr; |
| } |
| |
| private: |
| float currentAngle(SVGMarkerType type) const { |
| // For details of this calculation, see: |
| // http://www.w3.org/TR/SVG/single-page.html#painting-MarkerElement |
| FloatPoint inSlope(m_inslopePoints[1] - m_inslopePoints[0]); |
| FloatPoint outSlope(m_outslopePoints[1] - m_outslopePoints[0]); |
| |
| double inAngle = rad2deg(inSlope.slopeAngleRadians()); |
| double outAngle = rad2deg(outSlope.slopeAngleRadians()); |
| |
| switch (type) { |
| case StartMarker: |
| if (m_autoStartReverse) |
| outAngle += 180; |
| return clampTo<float>(outAngle); |
| case MidMarker: |
| // WK193015: Prevent bugs due to angles being non-continuous. |
| if (fabs(inAngle - outAngle) > 180) |
| inAngle += 360; |
| return clampTo<float>((inAngle + outAngle) / 2); |
| case EndMarker: |
| return clampTo<float>(inAngle); |
| } |
| |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| |
| void updateOutslope(const FloatPoint& point) { |
| m_outslopePoints[0] = m_origin; |
| m_outslopePoints[1] = point; |
| } |
| |
| void updateMarkerDataForPathElement(const PathElement* element) { |
| FloatPoint* points = element->points; |
| |
| switch (element->type) { |
| case PathElementAddQuadCurveToPoint: |
| m_inslopePoints[0] = points[0]; |
| m_inslopePoints[1] = points[1]; |
| m_origin = points[1]; |
| break; |
| case PathElementAddCurveToPoint: |
| m_inslopePoints[0] = points[1]; |
| m_inslopePoints[1] = points[2]; |
| m_origin = points[2]; |
| break; |
| case PathElementMoveToPoint: |
| m_subpathStart = points[0]; |
| case PathElementAddLineToPoint: |
| updateInslope(points[0]); |
| m_origin = points[0]; |
| break; |
| case PathElementCloseSubpath: |
| updateInslope(points[0]); |
| m_origin = m_subpathStart; |
| m_subpathStart = FloatPoint(); |
| } |
| } |
| |
| void updateInslope(const FloatPoint& point) { |
| m_inslopePoints[0] = m_origin; |
| m_inslopePoints[1] = point; |
| } |
| |
| Vector<MarkerPosition>& m_positions; |
| unsigned m_elementIndex; |
| FloatPoint m_origin; |
| FloatPoint m_subpathStart; |
| FloatPoint m_inslopePoints[2]; |
| FloatPoint m_outslopePoints[2]; |
| bool m_autoStartReverse; |
| }; |
| |
| } // namespace blink |
| |
| #endif // SVGMarkerData_h |