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 "kernel/geom.h"
   6 #include "kernel/gettext.h"
   7 #define _(str) gettext(str)
   8
   9 #include <X11/Xft/Xft.h>
  10 #include <glib.h>
  11 #include <string.h>
  12
  13 #define ELIPSES "..."
  14 #define ELIPSES_LENGTH(font) \
  15     (font->elipses_length + (font->shadow ? font->offset : 0))
  16
  17 #define OB_SHADOW "shadow"
  18 #define OB_SHADOW_OFFSET "shadowoffset"
  19 #define OB_SHADOW_ALPHA "shadowtint"
  20
  21 FcObjectType objs[] = {
  22     { OB_SHADOW,        FcTypeBool    },
  23     { OB_SHADOW_OFFSET, FcTypeInteger },
  24     { OB_SHADOW_ALPHA,  FcTypeInteger  }
  25 };
  26
  27 static gboolean started = FALSE;
  28
  29 static void font_startup(void)
  30 {
  31     if (!XftInit(0)) {
  32         g_warning(_("Couldn't initialize Xft.\n"));
  33         exit(EXIT_FAILURE);
  34     }
  35     FcNameRegisterObjectTypes(objs, (sizeof(objs) / sizeof(objs[0])));
  36 }
  37
  38 static void measure_font(RrFont *f)
  39 {
  40     XGlyphInfo info;
  41
  42     /* measure an elipses */
  43     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  44                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  45     f->elipses_length = (signed) info.xOff;
  46 }
  47
  48 static RrFont *openfont(const RrInstance *inst, char *fontstring)
  49 {
  50     RrFont *out;
  51     FcPattern *pat, *match;
  52     XftFont *font;
  53     FcResult res;
  54     gint tint;
  55
  56     if (!(pat = XftNameParse(fontstring)))
  57         return NULL;
  58
  59     match = XftFontMatch(RrDisplay(inst), RrScreen(inst), pat, &res);
  60     FcPatternDestroy(pat);
  61     if (!match)
  62         return NULL;
  63
  64     out = g_new(RrFont, 1);
  65     out->inst = inst;
  66
  67     if (FcPatternGetBool(match, OB_SHADOW, 0, &out->shadow) != FcResultMatch)
  68         out->shadow = FALSE;
  69     g_message("shadow %d", out->shadow);
  70
  71     if (FcPatternGetInteger(match, OB_SHADOW_OFFSET, 0, &out->offset) !=
  72         FcResultMatch)
  73         out->offset = 1;
  74
  75     if (FcPatternGetInteger(match, OB_SHADOW_ALPHA, 0, &tint) != FcResultMatch)
  76         tint = 25;
  77     if (tint > 100) tint = 100;
  78     else if (tint < -100) tint = -100;
  79     out->tint = tint;
  80
  81     font = XftFontOpenPattern(RrDisplay(inst), match);
  82     FcPatternDestroy(match);
  83     if (!font) {
  84         g_free(out);
  85         return NULL;
  86     } else
  87         out->xftfont = font;
  88
  89     measure_font(out);
  90
  91     return out;
  92 }
  93
  94 RrFont *RrFontOpen(const RrInstance *inst, char *fontstring)
  95 {
  96     RrFont *out;
  97
  98     if (!started) {
  99         font_startup();
 100         started = TRUE;
 101     }
 102
 103     if ((out = openfont(inst, fontstring)))
 104         return out;
 105     g_warning(_("Unable to load font: %s\n"), fontstring);
 106     g_warning(_("Trying fallback font: %s\n"), "sans");
 107
 108     if ((out = openfont(inst, "sans")))
 109         return out;
 110     g_warning(_("Unable to load font: %s\n"), "sans");
 111
 112     return NULL;
 113 }
 114
 115 void RrFontClose(RrFont *f)
 116 {
 117     if (f) {
 118         XftFontClose(RrDisplay(f->inst), f->xftfont);
 119         g_free(f);
 120     }
 121 }
 122
 123 static void font_measure_full(const RrFont *f, const gchar *str,
 124                               gint *x, gint *y)
 125 {
 126     XGlyphInfo info;
 127
 128     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
 129                        (const FcChar8*)str, strlen(str), &info);
 130
 131     *x = (signed) info.xOff + (f->shadow ? ABS(f->offset) : 0);
 132     *y = info.height + (f->shadow ? ABS(f->offset) : 0);
 133 }
 134
 135 int RrFontMeasureString(const RrFont *f, const gchar *str)
 136 {
 137     gint x, y;
 138     font_measure_full (f, str, &x, &y);
 139     return x;
 140 }
 141
 142 int RrFontHeight(const RrFont *f)
 143 {
 144     return f->xftfont->ascent + f->xftfont->descent +
 145         (f->shadow ? f->offset : 0);
 146 }
 147
 148 int RrFontMaxCharWidth(const RrFont *f)
 149 {
 150     return (signed) f->xftfont->max_advance_width;
 151 }
 152
 153 void RrFontDraw(XftDraw *d, RrTextureText *t, Rect *area)
 154 {
 155     gint x,y,w,h;
 156     XftColor c;
 157     GString *text;
 158     gint mw, em, mh;
 159     size_t l;
 160     gboolean shortened = FALSE;
 161
 162     /* center vertically */
 163     y = area->y +
 164         (area->height - RrFontHeight(t->font)) / 2;
 165     /* the +2 and -4 leave a small blank edge on the sides */
 166     x = area->x + 2;
 167     w = area->width - 4;
 168     h = area->height;
 169
 170     text = g_string_new(t->string);
 171     l = g_utf8_strlen(text->str, -1);
 172     font_measure_full(t->font, text->str, &mw, &mh);
 173     while (l && mw > area->width) {
 174         shortened = TRUE;
 175         /* remove a character from the middle */
 176         text = g_string_erase(text, l-- / 2, 1);
 177         em = ELIPSES_LENGTH(t->font);
 178         /* if the elipses are too large, don't show them at all */
 179         if (em > area->width)
 180             shortened = FALSE;
 181         font_measure_full(t->font, text->str, &mw, &mh);
 182         mw += em;
 183     }
 184     if (shortened) {
 185         text = g_string_insert(text, (l + 1) / 2, ELIPSES);
 186         l += 3;
 187     }
 188     if (!l) return;
 189
 190     switch (t->justify) {
 191     case RR_JUSTIFY_LEFT:
 192         break;
 193     case RR_JUSTIFY_RIGHT:
 194         x += (w - mw);
 195         break;
 196     case RR_JUSTIFY_CENTER:
 197         x += (w - mw) / 2;
 198         break;
 199     }
 200
 201     l = strlen(text->str); /* number of bytes */
 202
 203     if (t->font->shadow) {
 204         if (t->font->tint >= 0) {
 205             c.color.red = 0;
 206             c.color.green = 0;
 207             c.color.blue = 0;
 208             c.color.alpha = 0xffff * t->font->tint / 100;
 209             c.pixel = BlackPixel(RrDisplay(t->font->inst),
 210                                  RrScreen(t->font->inst));
 211         } else {
 212             c.color.red = 0xffff;
 213             c.color.green = 0xffff;
 214             c.color.blue = 0xffff;
 215             c.color.alpha = 0xffff * -t->font->tint / 100;
 216             c.pixel = WhitePixel(RrDisplay(t->font->inst),
 217                                  RrScreen(t->font->inst));
 218         }
 219         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->font->offset,
 220                           t->font->xftfont->ascent + y + t->font->offset,
 221                           (FcChar8*)text->str, l);
 222     }
 223     c.color.red = t->color->r | t->color->r << 8;
 224     c.color.green = t->color->g | t->color->g << 8;
 225     c.color.blue = t->color->b | t->color->b << 8;
 226     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 227     c.pixel = t->color->pixel;
 228
 229     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 230                       t->font->xftfont->ascent + y,
 231                       (FcChar8*)text->str, l);
 232     return;
 233 }