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."));
  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     FcPatternDestroy(pat);
  60     if (!match)
  61         return NULL;
  62
  63     out = g_new(RrFont, 1);
  64     out->inst = inst;
  65
  66     if (FcPatternGetBool(match, OB_SHADOW, 0, &out->shadow) != FcResultMatch)
  67         out->shadow = FALSE;
  68
  69     if (FcPatternGetInteger(match, OB_SHADOW_OFFSET, 0, &out->offset) !=
  70         FcResultMatch)
  71         out->offset = 1;
  72
  73     if (FcPatternGetInteger(match, OB_SHADOW_ALPHA, 0, &tint) != FcResultMatch)
  74         tint = 25;
  75     if (tint > 100) tint = 100;
  76     else if (tint < -100) tint = -100;
  77     out->tint = tint;
  78
  79     font = XftFontOpenPattern(RrDisplay(inst), match);
  80     if (!font) {
  81         FcPatternDestroy(match);
  82         g_free(out);
  83         return NULL;
  84     } else
  85         out->xftfont = font;
  86
  87     measure_font(out);
  88
  89     return out;
  90 }
  91
  92 RrFont *RrFontOpen(const RrInstance *inst, char *fontstring)
  93 {
  94     RrFont *out;
  95
  96     if (!started) {
  97         font_startup();
  98         started = TRUE;
  99     }
 100
 101     if ((out = openfont(inst, fontstring)))
 102         return out;
 103     g_warning(_("Unable to load font: %s\n"), fontstring);
 104     g_warning(_("Trying fallback font: %s\n"), "sans");
 105
 106     if ((out = openfont(inst, "sans")))
 107         return out;
 108     g_warning(_("Unable to load font: %s\n"), "sans");
 109
 110     return NULL;
 111 }
 112
 113 void RrFontClose(RrFont *f)
 114 {
 115     if (f) {
 116         g_message("freeing %p", f);
 117         XftFontClose(RrDisplay(f->inst), f->xftfont);
 118         g_free(f);
 119     }
 120 }
 121
 122 static void font_measure_full(const RrFont *f, const gchar *str,
 123                               gint *x, gint *y)
 124 {
 125     XGlyphInfo info;
 126
 127     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
 128                        (const FcChar8*)str, strlen(str), &info);
 129
 130     *x = (signed) info.xOff + (f->shadow ? ABS(f->offset) : 0);
 131     *y = info.height + (f->shadow ? ABS(f->offset) : 0);
 132 }
 133
 134 int RrFontMeasureString(const RrFont *f, const gchar *str)
 135 {
 136     gint x, y;
 137     font_measure_full (f, str, &x, &y);
 138     return x + 4;
 139 }
 140
 141 int RrFontHeight(const RrFont *f)
 142 {
 143     return f->xftfont->ascent + f->xftfont->descent +
 144         (f->shadow ? f->offset : 0);
 145 }
 146
 147 int RrFontMaxCharWidth(const RrFont *f)
 148 {
 149     return (signed) f->xftfont->max_advance_width;
 150 }
 151
 152 void RrFontDraw(XftDraw *d, RrTextureText *t, RrRect *area)
 153 {
 154     gint x,y,w,h;
 155     XftColor c;
 156     GString *text;
 157     gint mw, mh;
 158     size_t l;
 159     gboolean shortened = FALSE;
 160
 161     /* center vertically */
 162     y = area->y +
 163         (area->height - RrFontHeight(t->font)) / 2;
 164     /* the +2 and -4 leave a small blank edge on the sides */
 165     x = area->x + 2;
 166     w = area->width - 4;
 167     h = area->height;
 168
 169     text = g_string_new(t->string);
 170     l = g_utf8_strlen(text->str, -1);
 171     font_measure_full(t->font, text->str, &mw, &mh);
 172     while (l && mw > area->width) {
 173         shortened = TRUE;
 174         /* remove a character from the middle */
 175         text = g_string_erase(text, l-- / 2, 1);
 176         /* if the elipses are too large, don't show them at all */
 177         if (ELIPSES_LENGTH(t->font) > area->width)
 178             shortened = FALSE;
 179         font_measure_full(t->font, text->str, &mw, &mh);
 180         mw += ELIPSES_LENGTH(t->font);
 181     }
 182     if (shortened) {
 183         text = g_string_insert(text, (l + 1) / 2, ELIPSES);
 184         l += 3;
 185     }
 186     if (!l) return;
 187
 188     switch (t->justify) {
 189     case RR_JUSTIFY_LEFT:
 190         break;
 191     case RR_JUSTIFY_RIGHT:
 192         x += (w - mw);
 193         break;
 194     case RR_JUSTIFY_CENTER:
 195         x += (w - mw) / 2;
 196         break;
 197     }
 198
 199     l = strlen(text->str); /* number of bytes */
 200
 201     if (t->font->shadow) {
 202         if (t->font->tint >= 0) {
 203             c.color.red = 0;
 204             c.color.green = 0;
 205             c.color.blue = 0;
 206             c.color.alpha = 0xffff * t->font->tint / 100;
 207             c.pixel = BlackPixel(RrDisplay(t->font->inst),
 208                                  RrScreen(t->font->inst));
 209         } else {
 210             c.color.red = 0xffff;
 211             c.color.green = 0xffff;
 212             c.color.blue = 0xffff;
 213             c.color.alpha = 0xffff * -t->font->tint / 100;
 214             c.pixel = WhitePixel(RrDisplay(t->font->inst),
 215                                  RrScreen(t->font->inst));
 216         }
 217         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->font->offset,
 218                           t->font->xftfont->ascent + y + t->font->offset,
 219                           (FcChar8*)text->str, l);
 220     }
 221     c.color.red = t->color->r | t->color->r << 8;
 222     c.color.green = t->color->g | t->color->g << 8;
 223     c.color.blue = t->color->b | t->color->b << 8;
 224     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 225     c.pixel = t->color->pixel;
 226
 227     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 228                       t->font->xftfont->ascent + y,
 229                       (FcChar8*)text->str, l);
 230
 231     g_string_free(text, TRUE);
 232     return;
 233 }