108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
|
/* font.c - Font API and font file loader. */
|
||
|
|
/*
|
||
|
|
* GRUB -- GRand Unified Bootloader
|
||
|
|
* Copyright (C) 2003,2005,2006,2007,2008,2009,2010 Free Software Foundation, Inc.
|
||
|
|
*
|
||
|
|
* GRUB is free software: you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation, either version 3 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* GRUB is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <grub/bufio.h>
|
||
|
|
#include <grub/dl.h>
|
||
|
|
#include <grub/file.h>
|
||
|
|
#include <grub/font.h>
|
||
|
|
#include <grub/misc.h>
|
||
|
|
#include <grub/mm.h>
|
||
|
|
#include <grub/types.h>
|
||
|
|
#include <grub/video.h>
|
||
|
|
#include <grub/bitmap.h>
|
||
|
|
#include <grub/charset.h>
|
||
|
|
#include <grub/unicode.h>
|
||
|
|
#include <grub/fontformat.h>
|
||
|
|
|
||
|
|
/* Draw a UTF-8 string of text on the current video render target.
|
||
|
|
The x coordinate specifies the starting x position for the first character,
|
||
|
|
while the y coordinate specifies the baseline position.
|
||
|
|
If the string contains a character that FONT does not contain, then
|
||
|
|
a glyph from another loaded font may be used instead. */
|
||
|
|
grub_err_t
|
||
|
|
grub_font_draw_string (const char *str, grub_font_t font,
|
||
|
|
grub_video_color_t color,
|
||
|
|
int left_x, int baseline_y)
|
||
|
|
{
|
||
|
|
int x;
|
||
|
|
struct grub_font_glyph *glyph;
|
||
|
|
grub_uint32_t *logical;
|
||
|
|
grub_ssize_t logical_len, visual_len;
|
||
|
|
struct grub_unicode_glyph *visual, *ptr;
|
||
|
|
|
||
|
|
logical_len = grub_utf8_to_ucs4_alloc (str, &logical, 0);
|
||
|
|
if (logical_len < 0)
|
||
|
|
return grub_errno;
|
||
|
|
|
||
|
|
visual_len = grub_bidi_logical_to_visual (logical, logical_len, &visual, 0, 0);
|
||
|
|
grub_free (logical);
|
||
|
|
if (visual_len < 0)
|
||
|
|
return grub_errno;
|
||
|
|
|
||
|
|
for (ptr = visual, x = left_x; ptr < visual + visual_len; ptr++)
|
||
|
|
{
|
||
|
|
grub_err_t err;
|
||
|
|
glyph = grub_font_construct_glyph (font, ptr);
|
||
|
|
if (!glyph)
|
||
|
|
return grub_errno;
|
||
|
|
err = grub_font_draw_glyph (glyph, color, x, baseline_y);
|
||
|
|
grub_free (glyph);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
x += glyph->device_width;
|
||
|
|
}
|
||
|
|
|
||
|
|
grub_free (visual);
|
||
|
|
|
||
|
|
return GRUB_ERR_NONE;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Get the width in pixels of the specified UTF-8 string, when rendered in
|
||
|
|
in the specified font (but falling back on other fonts for glyphs that
|
||
|
|
are missing). */
|
||
|
|
int
|
||
|
|
grub_font_get_string_width (grub_font_t font, const char *str)
|
||
|
|
{
|
||
|
|
int width = 0;
|
||
|
|
grub_uint32_t *ptr;
|
||
|
|
grub_ssize_t logical_len;
|
||
|
|
grub_uint32_t *logical;
|
||
|
|
|
||
|
|
logical_len = grub_utf8_to_ucs4_alloc (str, &logical, 0);
|
||
|
|
if (logical_len < 0)
|
||
|
|
{
|
||
|
|
grub_errno = GRUB_ERR_NONE;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (ptr = logical; ptr < logical + logical_len;)
|
||
|
|
{
|
||
|
|
struct grub_unicode_glyph glyph;
|
||
|
|
|
||
|
|
ptr += grub_unicode_aglomerate_comb (ptr,
|
||
|
|
logical_len - (ptr - logical),
|
||
|
|
&glyph);
|
||
|
|
width += grub_font_get_constructed_device_width (font, &glyph);
|
||
|
|
|
||
|
|
grub_free (glyph.combining);
|
||
|
|
}
|
||
|
|
|
||
|
|
return width;
|
||
|
|
}
|