summaryrefslogtreecommitdiff
path: root/Build/source/texk/dvisvgm/dvisvgm-src/src/PsSpecialHandler.h
blob: 31436f7aa490dbaac14d92ef1cc80d970277b062 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/*************************************************************************
** PsSpecialHandler.h                                                   **
**                                                                      **
** This file is part of dvisvgm -- the DVI to SVG converter             **
** Copyright (C) 2005-2015 Martin Gieseking <martin.gieseking@uos.de>   **
**                                                                      **
** This program is free software; you can redistribute it and/or        **
** modify it under the terms of the GNU General Public License as       **
** published by the Free Software Foundation; either version 3 of       **
** the License, or (at your option) any later version.                  **
**                                                                      **
** This program 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 General Public License for more details.                         **
**                                                                      **
** You should have received a copy of the GNU General Public License    **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/

#ifndef DVISVGM_PSSPECIALHANDLER_H
#define DVISVGM_PSSPECIALHANDLER_H

#include <set>
#include <stack>
#include <string>
#include <vector>
#include "GraphicsPath.h"
#include "PSInterpreter.h"
#include "SpecialHandler.h"
#include "PSPattern.h"
#include "PSPreviewFilter.h"


class PSPattern;
class XMLElementNode;

class PsSpecialHandler : public SpecialHandler, public DVIEndPageListener, protected PSActions
{
	typedef GraphicsPath<double> Path;
	typedef std::vector<double>::const_iterator DoubleVecIt;
	typedef Color::ColorSpace ColorSpace;

	class ClippingStack
	{
		public:
			void pushEmptyPath ();
			void push (const Path &path, int saveID=-1);
			void replace (const Path &path);
			void dup (int saveID=-1);
			void pop (int saveID=-1, bool grestore=false);
			void clear ();
			bool empty () const {return _stack.empty();}
			bool clippathLoaded () const;
			void setClippathLoaded (bool loaded);
			const Path* top () const;
			Path* getPath (size_t id);
			int topID () const  {return _stack.empty() ? 0 : _stack.top().pathID;}

		private:
			struct Entry {
				int pathID;        ///< index referencing a path of the pool
				int saveID;        ///< if >=0, path was pushed by 'save', and saveID holds the ID of the
				bool cpathLoaded;  ///< true if clipping path was loaded into current path
				Entry (int pid, int sid) : pathID(pid), saveID(sid), cpathLoaded(false) {}
			};
			std::vector<Path> _paths;  ///< pool of all clipping paths
			std::stack<Entry> _stack;
	};

	enum PsSection {PS_NONE, PS_HEADERS, PS_BODY};

	public:
		PsSpecialHandler ();
		~PsSpecialHandler ();
		const char* name () const   {return "ps";}
		const char* info () const   {return "dvips PostScript specials";}
		const char** prefixes () const;
		void preprocess (const char *prefix, std::istream &is, SpecialActions *actions);
		bool process (const char *prefix, std::istream &is, SpecialActions *actions);
		void setDviScaleFactor (double dvi2bp) {_previewFilter.setDviScaleFactor(dvi2bp);}
		void enterBodySection ();

	public:
		static bool COMPUTE_CLIPPATHS_INTERSECTIONS;
		static bool SHADING_SEGMENT_OVERLAP;
		static int SHADING_SEGMENT_SIZE;
		static double SHADING_SIMPLIFY_DELTA;

	protected:
		void initialize ();
		void moveToDVIPos ();
		void executeAndSync (std::istream &is, bool updatePos);
		void processHeaderFile (const char *fname);
		void psfile (const std::string &fname, const std::map<std::string,std::string> &attr);
		void dviEndPage (unsigned pageno);
		void clip (Path &path, bool evenodd);
		void processSequentialPatchMesh (int shadingTypeID, ColorSpace cspace, VectorIterator<double> &it);
		void processLatticeTriangularPatchMesh (ColorSpace colorSpace, VectorIterator<double> &it);

		/// scale given value by current PS scale factors
		double scale (double v) const {return v*(_sx*_cos*_cos + _sy*(1-_cos*_cos));}

		void applyscalevals (std::vector<double> &p) {_sx = p[0]; _sy = p[1]; _cos = p[2];}
		void clip (std::vector<double> &p)           {clip(p, false);}
		void clip (std::vector<double> &p, bool evenodd);
		void clippath (std::vector<double> &p);
		void closepath (std::vector<double> &p);
		void curveto (std::vector<double> &p);
		void eoclip (std::vector<double> &p)         {clip(p, true);}
		void eofill (std::vector<double> &p)         {fill(p, true);}
		void fill (std::vector<double> &p, bool evenodd);
		void fill (std::vector<double> &p)           {fill(p, false);}
		void grestore (std::vector<double> &p);
		void grestoreall (std::vector<double> &p);
		void gsave (std::vector<double> &p);
		void initclip (std::vector<double> &p);
		void lineto (std::vector<double> &p);
		void makepattern (std::vector<double> &p);
		void moveto (std::vector<double> &p);
		void newpath (std::vector<double> &p);
		void querypos (std::vector<double> &p)       {_currentpoint = DPair(p[0], p[1]);}
		void restore (std::vector<double> &p);
		void rotate (std::vector<double> &p);
		void save (std::vector<double> &p);
		void scale (std::vector<double> &p);
		void setcmykcolor (std::vector<double> &cmyk);
		void setdash (std::vector<double> &p);
		void setgray (std::vector<double> &p);
		void sethsbcolor (std::vector<double> &hsb);
		void setlinecap (std::vector<double> &p)     {_linecap = UInt8(p[0]);}
		void setlinejoin (std::vector<double> &p)    {_linejoin = UInt8(p[0]);}
		void setlinewidth (std::vector<double> &p)   {_linewidth = p[0] ? scale(p[0])*1.00375 : 0.5;}
		void setmatrix (std::vector<double> &p);
		void setmiterlimit (std::vector<double> &p)  {_miterlimit = p[0]*1.00375;}
		void setopacityalpha (std::vector<double> &p){_opacityalpha = p[0];}
		void setpattern (std::vector<double> &p);
		void setrgbcolor (std::vector<double> &rgb);
		void shfill (std::vector<double> &p);
		void stroke (std::vector<double> &p);
		void translate (std::vector<double> &p);
		void executed ();

	private:
		PSInterpreter _psi;
		SpecialActions *_actions;
		PSPreviewFilter _previewFilter;  ///< filter to extract information generated by the preview package
		PsSection _psSection;       ///< current section processed (nothing yet, headers, or body specials)
		XMLElementNode *_xmlnode;   ///< if != 0, created SVG elements are appended to this node
		XMLElementNode *_savenode;  ///< pointer to temporaryly store _xmlnode
		std::string _headerCode;    ///< collected literal PS header code
		Path _path;
		DPair _currentpoint;        ///< current PS position in bp units
		Color _currentcolor;        ///< current stroke/fill color
		double _sx, _sy;            ///< horizontal and vertical scale factors retrieved by operator "applyscalevals"
		double _cos;                ///< cosine of angle between (1,0) and transform(1,0)
		double _linewidth;          ///< current linewidth
		double _miterlimit;         ///< current miter limit
		double _opacityalpha;       ///< opacity level (0=fully transparent, ..., 1=opaque)
		UInt8 _linecap  : 2;        ///< current line cap (0=butt, 1=round, 2=projecting square)
		UInt8 _linejoin : 2;        ///< current line join (0=miter, 1=round, 2=bevel)
		double _dashoffset;         ///< current dash offset
		std::vector<double> _dashpattern;
		ClippingStack _clipStack;
		std::map<int, PSPattern*> _patterns;
		PSTilingPattern *_pattern;  ///< current pattern
};

#endif