Line data    Source code

       1             : /**
       2             : Copyright (c) 2022 Roman Katuntsev <sbkarr@stappler.org>
       3             : Copyright (c) 2023 Stappler LLC <admin@stappler.dev>
       4             : 
       5             : Permission is hereby granted, free of charge, to any person obtaining a copy
       6             : of this software and associated documentation files (the "Software"), to deal
       7             : in the Software without restriction, including without limitation the rights
       8             : to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
       9             : copies of the Software, and to permit persons to whom the Software is
      10             : furnished to do so, subject to the following conditions:
      11             : 
      12             : The above copyright notice and this permission notice shall be included in
      13             : all copies or substantial portions of the Software.
      14             : 
      15             : THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      16             : IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      17             : FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
      18             : AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      19             : LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
      20             : OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
      21             : THE SOFTWARE.
      22             : **/
      23             : 
      24             : #ifndef STAPPLER_TESS_SPTESSLINE_H_
      25             : #define STAPPLER_TESS_SPTESSLINE_H_
      26             : 
      27             : #include "SPTess.h"
      28             : 
      29             : namespace STAPPLER_VERSIONIZED stappler::geom {
      30             : 
      31             : enum class LineCup {
      32             :         Butt,
      33             :         Round,
      34             :         Square
      35             : };
      36             : 
      37             : enum class LineJoin {
      38             :         Miter,
      39             :         Round,
      40             :         Bevel
      41             : };
      42             : 
      43             : enum class DrawStyle {
      44             :         None = 0,
      45             :         Fill = 1,
      46             :         Stroke = 2,
      47             :         FillAndStroke = 3,
      48             : };
      49             : 
      50       28332 : SP_DEFINE_ENUM_AS_MASK(DrawStyle)
      51             : 
      52             : // Helper class, that transform lines in SVG notation (bezier2/3, arcs) into series of segments,
      53             : // then output this segments to contour in tesselator
      54             : struct LineDrawer {
      55             :         // `e` defines relative error in terms of maximum allowed distance between the point,
      56             :         // where line should be in perfect implementation, and the segment in output
      57             :         // For perfect VG quality, it should be around 0.75 of screen pixel
      58             :         LineDrawer(float e, Rc<Tesselator> &&fill, Rc<Tesselator> &&stroke,
      59             :                         float lineWidth = 1.0f, LineJoin lineJoin = LineJoin::Miter, LineCup lineCup = LineCup::Butt);
      60             : 
      61             :         void drawBegin(float x, float y);
      62             :         void drawLine(float x, float y);
      63             :         void drawQuadBezier(float x1, float y1, float x2, float y2);
      64             :         void drawCubicBezier(float x1, float y1, float x2, float y2, float x3, float y3);
      65             :         void drawArc(float rx, float ry, float angle, bool largeArc, bool sweep, float x, float y);
      66             :         void drawClose(bool closed);
      67             : 
      68             :         void push(float x, float y);
      69             :         void pushStroke(const Vec2 &v0, const Vec2 &v1, const Vec2 &v2);
      70             : 
      71             :         struct BufferNode {
      72             :                 BufferNode *next;
      73             :                 BufferNode *prev;
      74             :                 Vec2 point;
      75             :         };
      76             : 
      77             :         DrawStyle style = DrawStyle::None;
      78             :         LineJoin lineJoin = LineJoin::Miter;
      79             :         LineCup lineCup = LineCup::Butt;
      80             :         float distanceError = 0.0f;
      81             :         float angularError = 0.0f;
      82             :         float strokeWidth = 0.0f;
      83             :         size_t count = 0;
      84             :         Vec2 origin[2];
      85             :         BufferNode buffer[3];
      86             :         BufferNode *target = nullptr;
      87             : 
      88             :         Rc<Tesselator> fill;
      89             :         Tesselator::Cursor fillCursor;
      90             : 
      91             :         Rc<Tesselator> stroke;
      92             :         Tesselator::Cursor strokeCursor;
      93             : 
      94             :         float _miterLimit = 4.0f;
      95             : };
      96             : 
      97             : }
      98             : 
      99             : #endif /* STAPPLER_TESS_SPTESSLINE_H_ */