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     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         XftFontClose(RrDisplay(f->inst), f->xftfont);
 117         g_free(f);
 118     }
 119 }
 120
 121 static void font_measure_full(const RrFont *f, const gchar *str,
 122                               gint *x, gint *y)
 123 {
 124     XGlyphInfo info;
 125
 126     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
 127                        (const FcChar8*)str, strlen(str), &info);
 128
 129     *x = (signed) info.xOff + (f->shadow ? ABS(f->offset) : 0);
 130     *y = info.height + (f->shadow ? ABS(f->offset) : 0);
 131 }
 132
 133 int RrFontMeasureString(const RrFont *f, const gchar *str)
 134 {
 135     gint x, y;
 136     font_measure_full (f, str, &x, &y);
 137     return x;
 138 }
 139
 140 int RrFontHeight(const RrFont *f)
 141 {
 142     return f->xftfont->ascent + f->xftfont->descent +
 143         (f->shadow ? f->offset : 0);
 144 }
 145
 146 int RrFontMaxCharWidth(const RrFont *f)
 147 {
 148     return (signed) f->xftfont->max_advance_width;
 149 }
 150
 151 void RrFontDraw(XftDraw *d, RrTextureText *t, Rect *area)
 152 {
 153     gint x,y,w,h;
 154     XftColor c;
 155     GString *text;
 156     gint mw, em, mh;
 157     size_t l;
 158     gboolean shortened = FALSE;
 159
 160     /* center vertically */
 161     y = area->y +
 162         (area->height - RrFontHeight(t->font)) / 2;
 163     /* the +2 and -4 leave a small blank edge on the sides */
 164     x = area->x + 2;
 165     w = area->width - 4;
 166     h = area->height;
 167
 168     text = g_string_new(t->string);
 169     l = g_utf8_strlen(text->str, -1);
 170     font_measure_full(t->font, text->str, &mw, &mh);
 171     while (l && mw > area->width) {
 172         shortened = TRUE;
 173         /* remove a character from the middle */
 174         text = g_string_erase(text, l-- / 2, 1);
 175         em = ELIPSES_LENGTH(t->font);
 176         /* if the elipses are too large, don't show them at all */
 177         if (em > area->width)
 178             shortened = FALSE;
 179         font_measure_full(t->font, text->str, &mw, &mh);
 180         mw += em;
 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     return;
 231 }