1 /* 2 * Copyright (C) Research In Motion Limited 2010. All rights reserved. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 */ 19 20 #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_SVG_SVG_MARKER_DATA_H_ 21 #define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_SVG_SVG_MARKER_DATA_H_ 22 23 #include "third_party/blink/renderer/core/svg/svg_path_consumer.h" 24 #include "third_party/blink/renderer/platform/graphics/path.h" 25 #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" 26 #include "third_party/blink/renderer/platform/wtf/math_extras.h" 27 28 namespace blink { 29 30 enum SVGMarkerType { kStartMarker, kMidMarker, kEndMarker }; 31 32 class LayoutSVGResourceMarker; 33 class SVGPathByteStream; 34 35 struct MarkerPosition { 36 DISALLOW_NEW(); MarkerPositionMarkerPosition37 MarkerPosition(SVGMarkerType use_type, 38 const FloatPoint& use_origin, 39 float use_angle) 40 : type(use_type), origin(use_origin), angle(use_angle) {} 41 SelectMarkerMarkerPosition42 LayoutSVGResourceMarker* SelectMarker( 43 LayoutSVGResourceMarker* marker_start, 44 LayoutSVGResourceMarker* marker_mid, 45 LayoutSVGResourceMarker* marker_end) const { 46 switch (type) { 47 case kStartMarker: 48 return marker_start; 49 case kMidMarker: 50 return marker_mid; 51 case kEndMarker: 52 return marker_end; 53 } 54 NOTREACHED(); 55 return nullptr; 56 } 57 58 SVGMarkerType type; 59 FloatPoint origin; 60 float angle; 61 }; 62 63 class SVGMarkerDataBuilder : private SVGPathConsumer { 64 STACK_ALLOCATED(); 65 66 public: SVGMarkerDataBuilder(Vector<MarkerPosition> & positions)67 explicit SVGMarkerDataBuilder(Vector<MarkerPosition>& positions) 68 : positions_(positions), 69 last_moveto_index_(0), 70 last_element_type_(kPathElementMoveToPoint) {} 71 72 // Build marker data for a Path. 73 void Build(const Path&); 74 75 // Build marker data for a SVGPathByteStream. 76 // 77 // A SVGPathByteStream is semantically higher-level than a Path, and thus 78 // this allows those higher-level constructs (for example arcs) to be handled 79 // correctly. This should be used in cases where the original path data can 80 // contain such higher-level constructs. 81 void Build(const SVGPathByteStream&); 82 83 private: 84 // SVGPathConsumer 85 void EmitSegment(const PathSegmentData&) override; 86 87 static void UpdateFromPathElement(void* info, const PathElement*); 88 89 enum AngleType { 90 kBisecting, 91 kInbound, 92 kOutbound, 93 }; 94 95 double CurrentAngle(AngleType) const; 96 AngleType DetermineAngleType(bool ends_subpath) const; 97 98 void UpdateAngle(bool ends_subpath); 99 100 struct SegmentData { 101 FloatSize start_tangent; // Tangent in the start point of the segment. 102 FloatSize end_tangent; // Tangent in the end point of the segment. 103 FloatPoint position; // The end point of the segment. 104 }; 105 106 static void ComputeQuadTangents(SegmentData&, 107 const FloatPoint& start, 108 const FloatPoint& control, 109 const FloatPoint& end); 110 SegmentData ExtractPathElementFeatures(const PathElement&) const; 111 void UpdateFromPathElement(const PathElement&); 112 void Flush(); 113 114 Vector<MarkerPosition>& positions_; 115 unsigned last_moveto_index_; 116 PathElementType last_element_type_; 117 FloatPoint origin_; 118 FloatPoint subpath_start_; 119 FloatSize in_slope_; 120 FloatSize out_slope_; 121 FloatSize last_moveto_out_slope_; 122 }; 123 124 } // namespace blink 125 126 #endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_SVG_SVG_MARKER_DATA_H_ 127