fonts.c

S3C44B0X下的LCD （framebuffer）驱动资料与相关代码

/*
 * linux/drivers/video/fonts.c -- `Soft' font definitions
 *
 *    Created 1995 by Geert Uytterhoeven
 *    Rewritten 1998 by Martin Mares <[e-mail]>
 *
 *	2001 - Documented with DocBook
 *	- Brad Douglas <[e-mail]>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */


#include <linux/config.h>
#include <linux/types.h>
#include <linux/string.h>
#if defined(__mc68000__) || defined(CONFIG_APUS)
#include <asm/setup.h>
#endif
#include <video/font.h>

#define NO_FONTS

static struct fbcon_font_desc *fbcon_fonts[] = {
#ifdef CONFIG_FONT_8x8
#undef NO_FONTS
    &font_vga_8x8,
#endif
#ifdef CONFIG_FONT_8x16
#undef NO_FONTS
    &font_vga_8x16,
#endif
#ifdef CONFIG_FONT_6x11
#if defined(CONFIG_FBCON_MAC) || defined(CONFIG_FB_SBUS)
#undef NO_FONTS
#endif
    &font_vga_6x11,
#endif
#ifdef CONFIG_FONT_SUN8x16
#undef NO_FONTS
    &font_sun_8x16,
#endif
#ifdef CONFIG_FONT_SUN12x22
#if defined(CONFIG_FB_SBUS) || defined(CONFIG_FBCON_CFB8) || defined(CONFIG_FBCON_CFB16) || defined(CONFIG_FBCON_CFB24) || defined(CONFIG_FBCON_CFB32)
#undef NO_FONTS
#endif
    &font_sun_12x22,
#endif
#ifdef CONFIG_FONT_ACORN_8x8
#undef NO_FONTS
    &font_acorn_8x8,
#endif
#ifdef CONFIG_FONT_PEARL_8x8
#undef NO_FONTS
    &font_pearl_8x8,
#endif
};

#define num_fonts (sizeof(fbcon_fonts)/sizeof(*fbcon_fonts))

#ifdef NO_FONTS
#error No fonts configured.
#endif


/**
 *	fbcon_find_font - find a font
 *	@name: string name of a font
 *
 *	Find a specified font with string name @name.
 *
 *	Returns %NULL if no font found, or a pointer to the
 *	specified font.
 *
 */

struct fbcon_font_desc *fbcon_find_font(char *name)
{
   unsigned int i;

   for (i = 0; i < num_fonts; i++)
      if (!strcmp(fbcon_fonts[i]->name, name))
	  return fbcon_fonts[i];
   return NULL;
}


/**
 *	fbcon_get_default_font - get default font
 *	@xres: screen size of X
 *	@yres: screen size of Y
 *
 *	Get the default font for a specified screen size.
 *	Dimensions are in pixels.
 *
 *	Returns %NULL if no font is found, or a pointer to the
 *	chosen font.
 *
 */

struct fbcon_font_desc *fbcon_get_default_font(int xres, int yres)
{
    int i, c, cc;
    struct fbcon_font_desc *f, *g;

    g = NULL;
    cc = -10000;
    for(i=0; i<num_fonts; i++) {
	f = fbcon_fonts[i];
	c = f->pref;
#if defined(__mc68000__) || defined(CONFIG_APUS)
#ifdef CONFIG_FONT_PEARL_8x8
	if (MACH_IS_AMIGA && f->idx == PEARL8x8_IDX)
	    c = 100;
#endif
#ifdef CONFIG_FONT_6x11
	if (MACH_IS_MAC && xres < 640 && f->idx == VGA6x11_IDX)
	    c = 100;
#endif
#endif
	if ((yres < 400) == (f->height <= 8))
	    c += 1000;
	if (c > cc) {
	    cc = c;
	    g = f;
	}
    }
    return g;
}