include/grace/canvasP.h

   1 /*
   2  * Grace - GRaphing, Advanced Computation and Exploration of data
   3  *
   4  * Home page: http://plasma-gate.weizmann.ac.il/Grace/
   5  *
   6  * Copyright (c) 1996-2003 Grace Development Team
   7  *
   8  * Maintained by Evgeny Stambulchik
   9  *
  10  *
  11  *                           All Rights Reserved
  12  *
  13  *    This program is free software; you can redistribute it and/or modify
  14  *    it under the terms of the GNU General Public License as published by
  15  *    the Free Software Foundation; either version 2 of the License, or
  16  *    (at your option) any later version.
  17  *
  18  *    This program is distributed in the hope that it will be useful,
  19  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *    GNU General Public License for more details.
  22  *
  23  *    You should have received a copy of the GNU General Public License
  24  *    along with this program; if not, write to the Free Software
  25  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #ifndef __CANVASP_H_
  29 #define __CANVASP_H_
  30
  31 #include <stdio.h>
  32
  33 #include <t1lib.h>
  34
  35 #include <grace/canvas.h>
  36
  37 #define COLOR_NONE      0
  38 #define COLOR_AUX       1
  39 #define COLOR_MAIN      2
  40
  41 #if defined(DEBUG_T1LIB)
  42 #  define T1LOGFILE LOGFILE
  43 #else
  44 #  define T1LOGFILE NO_LOGFILE
  45 #endif
  46
  47 #define T1_DEFAULT_BITMAP_PAD  8
  48
  49 #define T1_AALEVELS_LOW   5
  50 #define T1_AALEVELS_HIGH 17
  51
  52 #define fRGB2fSRGB(c) (c <= 0.0031308 ? 12.92*c:1.055*pow(c, 1.0/2.4) - 0.055)
  53
  54 /* Drawing properties */
  55 typedef struct {
  56     Pen pen;
  57     int bgcolor;
  58     int lines;
  59     double linew;
  60     int linecap;
  61     int linejoin;
  62     double charsize;
  63     int font;
  64     int fillrule;
  65 } DrawProps;
  66
  67 typedef struct {
  68     char *alias;
  69     char used;
  70     char chars_used[256];
  71 } FontDB;
  72
  73 typedef struct {
  74     int active;
  75     view v;
  76     view fv;
  77 } BBox_type;
  78
  79 typedef struct _CSGlyphCache {
  80     VPoint start;
  81     VPoint stop;
  82     GLYPH *glyph;
  83 } CSGlyphCache;
  84
  85 /* Canvas */
  86 struct _Canvas {
  87     /* drawing properties */
  88     DrawProps draw_props;
  89
  90     /* page background fill */
  91     int pagefill;
  92
  93     /* colors */
  94     unsigned int ncolors;
  95     CMap_entry *cmap;
  96
  97     /* patterns */
  98     unsigned int npatterns;
  99     PMap_entry *pmap;
 100
 101     /* linestyles */
 102     unsigned int nlinestyles;
 103     LMap_entry *lmap;
 104
 105     /* fonts */
 106     unsigned int nfonts;
 107     FontDB *FontDBtable;
 108     char **DefEncoding;
 109
 110     /* clipping */
 111     int clipflag;
 112     view clipview;
 113
 114     int draw_mode;
 115     int drypass;
 116
 117     BBox_type bboxes[2];
 118
 119     int max_path_length;
 120
 121     /* device array */
 122     unsigned int ndevices;
 123     Device_entry **device_table;
 124
 125     /* current device */
 126     Device_entry *curdevice;
 127
 128     /* "device ready" flag */
 129     int device_ready;
 130
 131     /* output stream */
 132     FILE *prstream;
 133
 134     /* info */
 135     char *username;
 136     char *docname;
 137     char *description;
 138
 139     /* user-supplied procedure for parsing composite strings */
 140     CanvasCSParseProc csparse_proc;
 141     /* user-supplied procedure for mapping font ids */
 142     CanvasFMapProc fmap_proc;
 143
 144     /* font size scale */
 145     double fscale;
 146     /* line width scale */
 147     double lscale;
 148
 149     /* user data */
 150     void *udata;
 151
 152     /* cached values of the grayscale AA levels and validity flags */
 153     int aacolors_low_ok;
 154     unsigned long aacolors_low[T1_AALEVELS_LOW];
 155     int aacolors_high_ok;
 156     unsigned long aacolors_high[T1_AALEVELS_HIGH];
 157 };
 158
 159 int clip_line(const Canvas *canvas,
 160     const VPoint *vp1, const VPoint *vp2, VPoint *vp1c, VPoint *vp2c);
 161 int points_overlap(const Canvas *canvas, const VPoint *vp1, const VPoint *vp2);
 162
 163 void canvas_dev_drawpixel(Canvas *canvas, const VPoint *vp);
 164 void canvas_dev_drawpolyline(Canvas *canvas,
 165     const VPoint *vps, int n, int mode);
 166 void canvas_dev_fillpolygon(Canvas *canvas, const VPoint *vps, int nc);
 167 void canvas_dev_drawarc(Canvas *canvas,
 168     const VPoint *vp1, const VPoint *vp2, double a1, double a2);
 169 void canvas_dev_fillarc(Canvas *canvas,
 170     const VPoint *vp1, const VPoint *vp2, double a1, double a2, int mode);
 171 void canvas_dev_putpixmap(Canvas *canvas, const VPoint *vp, const CPixmap *pm);
 172 void canvas_dev_puttext(Canvas *canvas,
 173     const VPoint *vp, const char *s, int len, int font, const TextMatrix *tm,
 174     int underline, int overline, int kerning);
 175
 176 void canvas_stats_reset(Canvas *canvas);
 177
 178 int initgraphics(Canvas *canvas, const CanvasStats *cstats);
 179 void leavegraphics(Canvas *canvas, const CanvasStats *cstats);
 180
 181 int is_valid_bbox(const view *v);
 182
 183 void reset_bboxes(Canvas *canvas);
 184 void update_bboxes(Canvas *canvas, const VPoint *vp);
 185 int update_bboxes_with_view(Canvas *canvas, const view *v);
 186 int update_bboxes_with_vpoints(Canvas *canvas,
 187     const VPoint *vps, int n, double lw);
 188
 189 int is_valid_color(const RGB *rgb);
 190 int find_color(const Canvas *canvas, const RGB *rgb);
 191 int realloc_color(Canvas *canvas, int n);
 192 void canvas_color_trans(Canvas *canvas, CMap_entry *cmap);
 193 int make_color_scale(Canvas *canvas,
 194     unsigned int fg, unsigned int bg,
 195     unsigned int ncolors, unsigned long *colors);
 196 int get_colortype(const Canvas *canvas, unsigned int cindex);
 197 int add_color(Canvas *canvas, const RGB *rgb, int ctype);
 198
 199 int canvas_set_pattern(Canvas *canvas, unsigned int n, const Pattern *pat);
 200 int canvas_set_linestyle(Canvas *canvas, unsigned int n, const LineStyle *ls);
 201
 202 int init_t1(Canvas *canvas);
 203 void initialize_patterns(Canvas *canvas);
 204 void initialize_linestyles(Canvas *canvas);
 205
 206 void get_page_viewport(const Canvas *canvas, double *vx, double *vy);
 207
 208 Device_entry *get_curdevice_props(const Canvas *canvas);
 209
 210 #endif /* __CANVASP_H_ */