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 #include <stdlib.h>
  13
  14 #define ELIPSES "..."
  15 #define ELIPSES_LENGTH(font) \
  16     (font->elipses_length + (font->shadow ? font->offset : 0))
  17
  18 #define OB_SHADOW "shadow"
  19 #define OB_SHADOW_OFFSET "shadowoffset"
  20 #define OB_SHADOW_ALPHA "shadowtint"
  21
  22 FcObjectType objs[] = {
  23     { OB_SHADOW,        FcTypeBool    },
  24     { OB_SHADOW_OFFSET, FcTypeInteger },
  25     { OB_SHADOW_ALPHA,  FcTypeInteger  }
  26 };
  27
  28 static gboolean started = FALSE;
  29
  30 static void font_startup(void)
  31 {
  32     if (!XftInit(0)) {
  33         g_warning(_("Couldn't initialize Xft.\n"));
  34         exit(EXIT_FAILURE);
  35     }
  36     FcNameRegisterObjectTypes(objs, (sizeof(objs) / sizeof(objs[0])));
  37 }
  38
  39 static void measure_font(RrFont *f)
  40 {
  41     XGlyphInfo info;
  42
  43     /* measure an elipses */
  44     XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont,
  45                        (FcChar8*)ELIPSES, strlen(ELIPSES), &info);
  46     f->elipses_length = (signed) info.xOff;
  47 }
  48
  49 static RrFont *openfont(const RrInstance *inst, char *fontstring)
  50 {
  51     RrFont *out;
  52     FcPattern *pat, *match;
  53     XftFont *font;
  54     FcResult res;
  55     gint tint;
  56
  57     if (!(pat = XftNameParse(fontstring)))
  58         return NULL;
  59
  60     match = XftFontMatch(RrDisplay(inst), RrScreen(inst), pat, &res);
  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
  70     if (FcPatternGetInteger(match, OB_SHADOW_OFFSET, 0, &out->offset) !=
  71         FcResultMatch)
  72         out->offset = 1;
  73
  74     if (FcPatternGetInteger(match, OB_SHADOW_ALPHA, 0, &tint) != FcResultMatch)
  75         tint = 25;
  76     if (tint > 100) tint = 100;
  77     else if (tint < -100) tint = -100;
  78     out->tint = tint;
  79
  80     font = XftFontOpenPattern(RrDisplay(inst), match);
  81     if (!font) {
  82         FcPatternDestroy(match);
  83         g_free(out);
  84         return NULL;
  85     } else
  86         out->xftfont = font;
  87
  88     measure_font(out);
  89
  90     return out;
  91 }
  92
  93 RrFont *RrFontOpen(const RrInstance *inst, char *fontstring)
  94 {
  95     RrFont *out;
  96
  97     if (!started) {
  98         font_startup();
  99         started = TRUE;
 100     }
 101
 102     if ((out = openfont(inst, fontstring)))
 103         return out;
 104     g_warning(_("Unable to load font: %s\n"), fontstring);
 105     g_warning(_("Trying fallback font: %s\n"), "sans");
 106
 107     if ((out = openfont(inst, "sans")))
 108         return out;
 109     g_warning(_("Unable to load font: %s\n"), "sans");
 110
 111     return NULL;
 112 }
 113
 114 void RrFontClose(RrFont *f)
 115 {
 116     if (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;
 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, Rect *area)
 153 {
 154     gint x,y,w,h;
 155     XftColor c;
 156     GString *text;
 157     gint mw, em, 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         em = ELIPSES_LENGTH(t->font);
 177         /* if the elipses are too large, don't show them at all */
 178         if (em > area->width)
 179             shortened = FALSE;
 180         font_measure_full(t->font, text->str, &mw, &mh);
 181         mw += em;
 182     }
 183     if (shortened) {
 184         text = g_string_insert(text, (l + 1) / 2, ELIPSES);
 185         l += 3;
 186     }
 187     if (!l) return;
 188
 189     switch (t->justify) {
 190     case RR_JUSTIFY_LEFT:
 191         break;
 192     case RR_JUSTIFY_RIGHT:
 193         x += (w - mw);
 194         break;
 195     case RR_JUSTIFY_CENTER:
 196         x += (w - mw) / 2;
 197         break;
 198     }
 199
 200     l = strlen(text->str); /* number of bytes */
 201
 202     if (t->font->shadow) {
 203         if (t->font->tint >= 0) {
 204             c.color.red = 0;
 205             c.color.green = 0;
 206             c.color.blue = 0;
 207             c.color.alpha = 0xffff * t->font->tint / 100;
 208             c.pixel = BlackPixel(RrDisplay(t->font->inst),
 209                                  RrScreen(t->font->inst));
 210         } else {
 211             c.color.red = 0xffff;
 212             c.color.green = 0xffff;
 213             c.color.blue = 0xffff;
 214             c.color.alpha = 0xffff * -t->font->tint / 100;
 215             c.pixel = WhitePixel(RrDisplay(t->font->inst),
 216                                  RrScreen(t->font->inst));
 217         }
 218         XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->font->offset,
 219                           t->font->xftfont->ascent + y + t->font->offset,
 220                           (FcChar8*)text->str, l);
 221     }
 222     c.color.red = t->color->r | t->color->r << 8;
 223     c.color.green = t->color->g | t->color->g << 8;
 224     c.color.blue = t->color->b | t->color->b << 8;
 225     c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
 226     c.pixel = t->color->pixel;
 227
 228     XftDrawStringUtf8(d, &c, t->font->xftfont, x,
 229                       t->font->xftfont->ascent + y,
 230                       (FcChar8*)text->str, l);
 231     return;
 232 }