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