draw.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <X11/Xlib.h>
   6
   7 #include "draw.h"
   8 #include "util.h"
   9
  10 Draw *
  11 draw_create(Display *dpy, int screen, Window win, unsigned int w, unsigned int h) {
  12         Draw *draw = (Draw *)calloc(1, sizeof(Draw));
  13         draw->dpy = dpy;
  14         draw->screen = screen;
  15         draw->win = win;
  16         draw->w = w;
  17         draw->h = h;
  18         draw->drawable = XCreatePixmap(dpy, win, w, h, DefaultDepth(dpy, screen));
  19         draw->gc = XCreateGC(dpy, win, 0, NULL);
  20         XSetLineAttributes(dpy, draw->gc, 1, LineSolid, CapButt, JoinMiter);
  21         return draw;
  22 }
  23
  24 void
  25 draw_resize(Draw *draw, unsigned int w, unsigned int h) {
  26         if(!draw)
  27                 return;
  28         draw->w = w;
  29         draw->h = h;
  30         XFreePixmap(draw->dpy, draw->drawable);
  31         draw->drawable = XCreatePixmap(draw->dpy, draw->win, w, h, DefaultDepth(draw->dpy, draw->screen));
  32 }
  33
  34 void
  35 draw_free(Draw *draw) {
  36         XFreePixmap(draw->dpy, draw->drawable);
  37         XFreeGC(draw->dpy, draw->gc);
  38         free(draw);
  39 }
  40
  41 Fnt *
  42 draw_font_create(Draw *draw, const char *fontname) {
  43         Fnt *font;
  44         char *def, **missing;
  45         int n;
  46
  47         if(!draw)
  48                 return NULL;
  49         font = (Fnt *)calloc(1, sizeof(Fnt));
  50         font->set = XCreateFontSet(draw->dpy, fontname, &missing, &n, &def);
  51         if(missing) {
  52                 while(n--)
  53                         fprintf(stderr, "draw: missing fontset: %s\n", missing[n]);
  54                 XFreeStringList(missing);
  55         }
  56         if(font->set) {
  57                 XFontStruct **xfonts;
  58                 char **font_names;
  59                 XExtentsOfFontSet(font->set);
  60                 n = XFontsOfFontSet(font->set, &xfonts, &font_names);
  61                 while(n--) {
  62                         font->ascent = MAX(font->ascent, (*xfonts)->ascent);
  63                         font->descent = MAX(font->descent,(*xfonts)->descent);
  64                         xfonts++;
  65                 }
  66         }
  67         else {
  68                 if(!(font->xfont = XLoadQueryFont(draw->dpy, fontname))
  69                 && !(font->xfont = XLoadQueryFont(draw->dpy, "fixed")))
  70                         die("error, cannot load font: '%s'\n", fontname);
  71                 font->ascent = font->xfont->ascent;
  72                 font->descent = font->xfont->descent;
  73         }
  74         font->h = font->ascent + font->descent;
  75         return font;
  76 }
  77
  78 void
  79 draw_font_free(Draw *draw, Fnt *font) {
  80         if(!draw || !font)
  81                 return;
  82         if(font->set)
  83                 XFreeFontSet(draw->dpy, font->set);
  84         else
  85                 XFreeFont(draw->dpy, font->xfont);
  86         free(font);
  87 }
  88
  89 Col *
  90 draw_col_create(Draw *draw, const char *colname) {
  91         Col *col = (Col *)calloc(1, sizeof(Col));
  92         Colormap cmap = DefaultColormap(draw->dpy, draw->screen);
  93         XColor color;
  94
  95         if(!XAllocNamedColor(draw->dpy, cmap, colname, &color, &color))
  96                 die("error, cannot allocate color '%s'\n", colname);
  97         col->rgb = color.pixel;
  98         return col;
  99 }
 100
 101 void
 102 draw_col_free(Draw *draw, Col *col) {
 103         if(!col)
 104                 return;
 105         free(col);
 106 }
 107
 108 void
 109 draw_setfont(Draw *draw, Fnt *font) {
 110         if(!draw)
 111                 return;
 112         draw->font = font;
 113 }
 114
 115 void
 116 draw_setfg(Draw *draw, Col *col) {
 117         if(!draw)
 118                 return;
 119         draw->fg = col;
 120 }
 121
 122 void
 123 draw_setbg(Draw *draw, Col *col) {
 124         if(!draw)
 125                 return;
 126         draw->bg = col;
 127 }
 128
 129 void
 130 draw_rect(Draw *draw, int x, int y, unsigned int w, unsigned int h, Bool filled, Bool empty, Bool invert) {
 131         int dx;
 132
 133         if(!draw || !draw->font || !draw->fg || !draw->bg)
 134                 return;
 135         XSetForeground(draw->dpy, draw->gc, invert ? draw->bg->rgb : draw->fg->rgb);
 136         dx = (draw->font->ascent + draw->font->descent + 2) / 4;
 137         if(filled)
 138                 XFillRectangle(draw->dpy, draw->drawable, draw->gc, x+1, y+1, dx+1, dx+1);
 139         else if(empty)
 140                 XDrawRectangle(draw->dpy, draw->drawable, draw->gc, x+1, y+1, dx, dx);
 141 }
 142
 143 void
 144 draw_text(Draw *draw, int x, int y, unsigned int w, unsigned int h, const char *text, Bool invert) {
 145         char buf[256];
 146         int i, tx, ty, len, olen;
 147         TextExtents tex;
 148
 149         if(!draw || !draw->fg || !draw->bg)
 150                 return;
 151         XSetForeground(draw->dpy, draw->gc, invert ? draw->fg->rgb : draw->bg->rgb);
 152         XFillRectangle(draw->dpy, draw->drawable, draw->gc, x, y, w, h);
 153         if(!text || !draw->font)
 154                 return;
 155         olen = strlen(text);
 156         draw_getextents(draw, text, olen, &tex);
 157         ty = y + (h / 2) - tex.yOff;
 158         tx = x + tex.xOff;
 159         /* shorten text if necessary */
 160         for(len = MIN(olen, sizeof buf); len && tex.w > w - tex.h; len--)
 161                 draw_getextents(draw, text, len, &tex);
 162         if(!len)
 163                 return;
 164         memcpy(buf, text, len);
 165         if(len < olen)
 166                 for(i = len; i && i > len - 3; buf[--i] = '.');
 167         XSetForeground(draw->dpy, draw->gc, invert ? draw->bg->rgb : draw->fg->rgb);
 168         if(draw->font->set)
 169                 XmbDrawString(draw->dpy, draw->drawable, draw->font->set, draw->gc, tx, ty, buf, len);
 170         else
 171                 XDrawString(draw->dpy, draw->drawable, draw->gc, tx, ty, buf, len);
 172 }
 173
 174 void
 175 draw_map(Draw *draw, int x, int y, unsigned int w, unsigned int h) {
 176         if(!draw)
 177                 return;
 178         XCopyArea(draw->dpy, draw->drawable, draw->win, draw->gc, x, y, w, h, x, y);
 179         XSync(draw->dpy, False);
 180 }
 181
 182
 183 void
 184 draw_getextents(Draw *draw, const char *text, unsigned int len, TextExtents *extents) {
 185         XRectangle r;
 186
 187         if(!draw || !draw->font || !text)
 188                 return;
 189         if(draw->font->set) {
 190                 XmbTextExtents(draw->font->set, text, len, NULL, &r);
 191                 extents->xOff = r.x;
 192                 extents->yOff = r.y;
 193                 extents->w = r.width;
 194                 extents->h = r.height;
 195         }
 196         else {
 197                 extents->h = draw->font->ascent + draw->font->descent;
 198                 extents->w = XTextWidth(draw->font->xfont, text, len);
 199                 extents->xOff = extents->h / 2;
 200                 extents->yOff = (extents->h / 2) + draw->font->ascent;
 201         }
 202 }