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