Dogcows Code - chaz/openbox/blob - render/font.c

   1 #include "font.h"
   2 #include "color.h"
   3 #include "mask.h"
   4 #include "theme.h"
   5 #include "gettext.h"
   6
   7 #include <X11/Xft/Xft.h>
   8 #include <glib.h>
   9 #include <string.h>
  10 #include <stdlib.h>
  11
  12 #define ELIPSES "..."
  13 #define ELIPSES_LENGTH(font) \
  14     (font->elipses_length + (font->shadow ? font->offset : 0))
  15
  16 #define OB_SHADOW "shadow"
  17 #define OB_SHADOW_OFFSET "shadowoffset"
  18 #define OB_SHADOW_ALPHA "shadowtint"
  19
  20 FcObjectType objs[] = {
  21     { OB_SHADOW,        FcTypeBool    },
  22     { OB_SHADOW_OFFSET, FcTypeInteger },
  23     { OB_SHADOW_ALPHA,  FcTypeInteger  }
  24 };
  25
  26 static gboolean started = FALSE;
  27
  28 static void font_startup(void)
  29 {
  30     if (!XftInit(0)) {
  31         g_warning(_("Couldn't initialize Xft.\n"));
  32         exit(EXIT_FAILURE);
  33     }
  34     FcNameRegisterObjectTypes(objs, (sizeof(objs) / sizeof(objs[0])));
  35 }
  36
  37 static void measure_font(RrFont *f)
  38 {
  39     XGlyphInfo info;
  40
  41     /* measure an elipses */
  42     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  43                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  44     f->elipses_length = (signed) info.xOff;
  45 }
  46
  47 static RrFont *openfont(const RrInstance *inst, char *fontstring)
  48 {
  49     RrFont *out;
  50     FcPattern *pat, *match;
  51     XftFont *font;
  52     FcResult res;
  53     gint tint;
  54
  55     if (!(pat = XftNameParse(fontstring)))
  56         return NULL;
  57
  58     match = XftFontMatch(RrDisplay(inst), RrScreen(inst), pat, &res);
  59     if (!match)
  60         return NULL;
  61
  62     out = g_new(RrFont, 1);
  63     out->inst = inst;
  64
  65     if (FcPatternGetBool(match, OB_SHADOW, 0, &out->shadow) != FcResultMatch)
  66         out->shadow = FALSE;
  67
  68     if (FcPatternGetInteger(match, OB_SHADOW_OFFSET, 0, &out->offset) !=
  69         FcResultMatch)
  70         out->offset = 1;
  71
  72     if (FcPatternGetInteger(match, OB_SHADOW_ALPHA, 0, &tint) != FcResultMatch)
  73         tint = 25;
  74     if (tint > 100) tint = 100;
  75     else if (tint < -100) tint = -100;
  76     out->tint = tint;
  77
  78     font = XftFontOpenPattern(RrDisplay(inst), match);
  79     if (!font) {
  80         FcPatternDestroy(match);
  81         g_free(out);
  82         return NULL;
  83     } else
  84         out->xftfont = font;
  85
  86     measure_font(out);
  87
  88     return out;
  89 }
  90
  91 RrFont *RrFontOpen(const RrInstance *inst, char *fontstring)
  92 {
  93     RrFont *out;
  94
  95     if (!started) {
  96         font_startup();
  97         started = TRUE;
  98     }
  99
 100     if ((out = openfont(inst, fontstring)))
 101         return out;
 102     g_warning(_("Unable to load font: %s\n"), fontstring);
 103     g_warning(_("Trying fallback font: %s\n"), "sans");
 104
 105     if ((out = openfont(inst, "sans")))
 106         return out;
 107     g_warning(_("Unable to load font: %s\n"), "sans");
 108
 109     return NULL;
 110 }
 111
 112 void RrFontClose(RrFont *f)
 113 {
 114     if (f) {
 115         XftFontClose(RrDisplay(f->inst), f->xftfont);
 116         g_free(f);
 117     }
 118 }
 119
 120 static void font_measure_full(const RrFont *f, const gchar *str,
 121                               gint *x, gint *y)
 122 {
 123     XGlyphInfo info;
 124
 125     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
 126                        (const FcChar8*)str, strlen(str), &info);
 127
 128     *x = (signed) info.xOff + (f->shadow ? ABS(f->offset) : 0);
 129     *y = info.height + (f->shadow ? ABS(f->offset) : 0);
 130 }
 131
 132 int RrFontMeasureString(const RrFont *f, const gchar *str)
 133 {
 134     gint x, y;
 135     font_measure_full (f, str, &x, &y);
 136     return x + 4;
 137 }
 138
 139 int RrFontHeight(const RrFont *f)
 140 {
 141     return f->xftfont->ascent + f->xftfont->descent +
 142         (f->shadow ? f->offset : 0);
 143 }
 144
 145 int RrFontMaxCharWidth(const RrFont *f)
 146 {
 147     return (signed) f->xftfont->max_advance_width;
 148 }
 149
 150 void RrFontDraw(XftDraw *d, RrTextureText *t, RrRect *area)
 151 {
 152     gint x,y,w,h;
 153     XftColor c;
 154     GString *text;
 155     gint mw, em, mh;
 156     size_t l;
 157     gboolean shortened = FALSE;
 158
 159     /* center vertically */
 160     y = area->y +
 161         (area->height - RrFontHeight(t->font)) / 2;
 162     /* the +2 and -4 leave a small blank edge on the sides */
 163     x = area->x + 2;
 164     w = area->width - 4;
 165     h = area->height;
 166
 167     text = g_string_new(t->string);
 168     l = g_utf8_strlen(text->str, -1);
 169     font_measure_full(t->font, text->str, &mw, &mh);
 170     while (l && mw > area->width) {
 171         shortened = TRUE;
 172         /* remove a character from the middle */
 173         text = g_string_erase(text, l-- / 2, 1);
 174         em = ELIPSES_LENGTH(t->font);
 175         /* if the elipses are too large, don't show them at all */
 176         if (em > area->width)
 177             shortened = FALSE;
 178         font_measure_full(t->font, text->str, &mw, &mh);
 179         mw += em;
 180     }
 181     if (shortened) {
 182         text = g_string_insert(text, (l + 1) / 2, ELIPSES);
 183         l += 3;
 184     }
 185     if (!l) return;
 186
 187     switch (t->justify) {
 188     case RR_JUSTIFY_LEFT:
 189         break;
 190     case RR_JUSTIFY_RIGHT:
 191         x += (w - mw);
 192         break;
 193     case RR_JUSTIFY_CENTER:
 194         x += (w - mw) / 2;
 195         break;
 196     }
 197
 198     l = strlen(text->str); /* number of bytes */
 199
 200     if (t->font->shadow) {
 201         if (t->font->tint >= 0) {
 202             c.color.red = 0;
 203             c.color.green = 0;
 204             c.color.blue = 0;
 205             c.color.alpha = 0xffff * t->font->tint / 100;
 206             c.pixel = BlackPixel(RrDisplay(t->font->inst),
 207                                  RrScreen(t->font->inst));
 208         } else {
 209             c.color.red = 0xffff;
 210             c.color.green = 0xffff;
 211             c.color.blue = 0xffff;
 212             c.color.alpha = 0xffff * -t->font->tint / 100;
 213             c.pixel = WhitePixel(RrDisplay(t->font->inst),
 214                                  RrScreen(t->font->inst));
 215         }
 216         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->font->offset,
 217                           t->font->xftfont->ascent + y + t->font->offset,
 218                           (FcChar8*)text->str, l);
 219     }
 220     c.color.red = t->color->r | t->color->r << 8;
 221     c.color.green = t->color->g | t->color->g << 8;
 222     c.color.blue = t->color->b | t->color->b << 8;
 223     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 224     c.pixel = t->color->pixel;
 225
 226     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 227                       t->font->xftfont->ascent + y,
 228                       (FcChar8*)text->str, l);
 229     return;
 230 }