vbatts/grub
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2009-11-29 Vladimir Serbinenko <phcoder@gmail.com>

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Optimise glyph lookup by Basic Multilingual Plane lookup array.

	* font/font.c (struct grub_font): New member 'bmp_idx'.
	(font_init): Initialise 'bmp_idx'.
	(load_font_index): Fill 'bmp_idx'.
	(find_glyph): Make inline. Use bmp_idx for BMP characters.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-01-20 21:56:05 +01:00
commit bed35bdac7
2 changed files with 33 additions and 2 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2009-11-29 Vladimir Serbinenko <phcoder@gmail.com>
Optimise glyph lookup by Basic Multilingual Plane lookup array.
* font/font.c (struct grub_font): New member 'bmp_idx'.
(font_init): Initialise 'bmp_idx'.
(load_font_index): Fill 'bmp_idx'.
(find_glyph): Make inline. Use bmp_idx for BMP characters.
2010-01-20 Vladimir Serbinenko <phcoder@gmail.com>
* video/fb/video_fb.c (grub_video_fb_scroll): Optimise by avoiding

26
font/font.c
View file

@ -63,6 +63,7 @@ struct grub_font
short leading;
grub_uint32_t num_chars;
struct char_index_entry *char_index;
grub_uint16_t *bmp_idx;
};
/* Definition of font registry. */
@ -227,6 +228,7 @@ font_init (grub_font_t font)
font->descent = 0;
font->num_chars = 0;
font->char_index = 0;
font->bmp_idx = 0;
}
/* Open the next section in the file.
@ -320,6 +322,14 @@ load_font_index (grub_file_t file, grub_uint32_t sect_length, struct
* sizeof (struct char_index_entry));
if (! font->char_index)
return 1;
font->bmp_idx = grub_malloc (0x10000 * sizeof (grub_uint16_t));
if (! font->bmp_idx)
{
grub_free (font->char_index);
return 1;
}
grub_memset (font->bmp_idx, 0xff, 0x10000 * sizeof (grub_uint16_t));
#if FONT_DEBUG >= 2
grub_printf("num_chars=%d)\n", font->num_chars);
@ -346,6 +356,9 @@ load_font_index (grub_file_t file, grub_uint32_t sect_length, struct
return 1;
}
if (entry->code < 0x10000)
font->bmp_idx[entry->code] = i;
last_code = entry->code;
/* Read storage flags byte. */
@ -641,7 +654,7 @@ read_be_int16 (grub_file_t file, grub_int16_t * value)
/* Return a pointer to the character index entry for the glyph corresponding to
the codepoint CODE in the font FONT. If not found, return zero. */
static struct char_index_entry *
static inline struct char_index_entry *
find_glyph (const grub_font_t font, grub_uint32_t code)
{
struct char_index_entry *table;
@ -649,8 +662,17 @@ find_glyph (const grub_font_t font, grub_uint32_t code)
grub_size_t hi;
grub_size_t mid;
/* Do a binary search in `char_index', which is ordered by code point. */
table = font->char_index;
/* Use BMP index if possible. */
if (code < 0x10000)
{
if (font->bmp_idx[code] == 0xffff)
return 0;
return &table[font->bmp_idx[code]];
}
/* Do a binary search in `char_index', which is ordered by code point. */
lo = 0;
hi = font->num_chars - 1;