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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:51 +0000 |
commit | 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e (patch) | |
tree | 32451fa3cdd9321fb2591fada9891b2cb70a9cd1 /grub-core/gfxmenu/font.c | |
parent | Initial commit. (diff) | |
download | grub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.tar.xz grub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.zip |
Adding upstream version 2.06.upstream/2.06upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | grub-core/gfxmenu/font.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/grub-core/gfxmenu/font.c b/grub-core/gfxmenu/font.c new file mode 100644 index 0000000..756c24f --- /dev/null +++ b/grub-core/gfxmenu/font.c @@ -0,0 +1,116 @@ +/* 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> +#include <grub/gfxmenu_view.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; + grub_uint32_t *logical; + grub_ssize_t logical_len, visual_len; + struct grub_unicode_glyph *visual, *ptr; + grub_err_t err; + + 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, 0, 0, 0, 0, 0); + grub_free (logical); + if (visual_len < 0) + return grub_errno; + + err = GRUB_ERR_NONE; + for (ptr = visual, x = left_x; ptr < visual + visual_len; ptr++) + { + struct grub_font_glyph *glyph; + glyph = grub_font_construct_glyph (font, ptr); + if (!glyph) + { + err = grub_errno; + goto out; + } + err = grub_font_draw_glyph (glyph, color, x, baseline_y); + if (err) + goto out; + x += glyph->device_width; + } + +out: + for (ptr = visual; ptr < visual + visual_len; ptr++) + grub_unicode_destroy_glyph (ptr); + grub_free (visual); + + return err; +} + +/* 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_unicode_destroy_glyph (&glyph); + } + grub_free (logical); + + return width; +} |