lib/fonts/fonts.c

   1 /*
   2  * `Soft' font definitions
   3  *
   4  *    Created 1995 by Geert Uytterhoeven
   5  *    Rewritten 1998 by Martin Mares <mj@ucw.cz>
   6  *
   7  *      2001 - Documented with DocBook
   8  *      - Brad Douglas <brad@neruo.com>
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file COPYING in the main directory of this archive
  12  * for more details.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/string.h>
  18 #if defined(__mc68000__)
  19 #include <asm/setup.h>
  20 #endif
  21 #include <linux/font.h>
  22
  23 static const struct font_desc *fonts[] = {
  24 #ifdef CONFIG_FONT_8x8
  25         &font_vga_8x8,
  26 #endif
  27 #ifdef CONFIG_FONT_8x16
  28         &font_vga_8x16,
  29 #endif
  30 #ifdef CONFIG_FONT_6x11
  31         &font_vga_6x11,
  32 #endif
  33 #ifdef CONFIG_FONT_7x14
  34         &font_7x14,
  35 #endif
  36 #ifdef CONFIG_FONT_SUN8x16
  37         &font_sun_8x16,
  38 #endif
  39 #ifdef CONFIG_FONT_SUN12x22
  40         &font_sun_12x22,
  41 #endif
  42 #ifdef CONFIG_FONT_10x18
  43         &font_10x18,
  44 #endif
  45 #ifdef CONFIG_FONT_ACORN_8x8
  46         &font_acorn_8x8,
  47 #endif
  48 #ifdef CONFIG_FONT_PEARL_8x8
  49         &font_pearl_8x8,
  50 #endif
  51 #ifdef CONFIG_FONT_MINI_4x6
  52         &font_mini_4x6,
  53 #endif
  54 #ifdef CONFIG_FONT_6x10
  55         &font_6x10,
  56 #endif
  57 #ifdef CONFIG_FONT_TER16x32
  58         &font_ter_16x32,
  59 #endif
  60 #ifdef CONFIG_FONT_6x8
  61         &font_6x8,
  62 #endif
  63 };
  64
  65 #define num_fonts ARRAY_SIZE(fonts)
  66
  67 #ifdef NO_FONTS
  68 #error No fonts configured.
  69 #endif
  70
  71
  72 /**
  73  *      find_font - find a font
  74  *      @name: string name of a font
  75  *
  76  *      Find a specified font with string name @name.
  77  *
  78  *      Returns %NULL if no font found, or a pointer to the
  79  *      specified font.
  80  *
  81  */
  82 const struct font_desc *find_font(const char *name)
  83 {
  84         unsigned int i;
  85
  86         BUILD_BUG_ON(!num_fonts);
  87         for (i = 0; i < num_fonts; i++)
  88                 if (!strcmp(fonts[i]->name, name))
  89                         return fonts[i];
  90         return NULL;
  91 }
  92 EXPORT_SYMBOL(find_font);
  93
  94
  95 /**
  96  *      get_default_font - get default font
  97  *      @xres: screen size of X
  98  *      @yres: screen size of Y
  99  *      @font_w: bit array of supported widths (1 - FB_MAX_BLIT_WIDTH)
 100  *      @font_h: bit array of supported heights (1 - FB_MAX_BLIT_HEIGHT)
 101  *
 102  *      Get the default font for a specified screen size.
 103  *      Dimensions are in pixels.
 104  *
 105  *      font_w or font_h being NULL means all values are supported.
 106  *
 107  *      Returns %NULL if no font is found, or a pointer to the
 108  *      chosen font.
 109  *
 110  */
 111 const struct font_desc *get_default_font(int xres, int yres,
 112                                          unsigned long *font_w,
 113                                          unsigned long *font_h)
 114 {
 115         int i, c, cc, res;
 116         const struct font_desc *f, *g;
 117
 118         g = NULL;
 119         cc = -10000;
 120         for (i = 0; i < num_fonts; i++) {
 121                 f = fonts[i];
 122                 c = f->pref;
 123 #if defined(__mc68000__)
 124 #ifdef CONFIG_FONT_PEARL_8x8
 125                 if (MACH_IS_AMIGA && f->idx == PEARL8x8_IDX)
 126                         c = 100;
 127 #endif
 128 #ifdef CONFIG_FONT_6x11
 129                 if (MACH_IS_MAC && xres < 640 && f->idx == VGA6x11_IDX)
 130                         c = 100;
 131 #endif
 132 #endif
 133                 if ((yres < 400) == (f->height <= 8))
 134                         c += 1000;
 135
 136                 /* prefer a bigger font for high resolution */
 137                 res = (xres / f->width) * (yres / f->height) / 1000;
 138                 if (res > 20)
 139                         c += 20 - res;
 140
 141                 if ((!font_w || test_bit(f->width - 1, font_w)) &&
 142                     (!font_h || test_bit(f->height - 1, font_h)))
 143                         c += 1000;
 144
 145                 if (c > cc) {
 146                         cc = c;
 147                         g = f;
 148                 }
 149         }
 150         return g;
 151 }
 152 EXPORT_SYMBOL(get_default_font);
 153
 154 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
 155 MODULE_DESCRIPTION("Console Fonts");
 156 MODULE_LICENSE("GPL");