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/*
* This file is part of RUfl
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license
* Copyright 2005 James Bursa <james@semichrome.net>
* Copyright 2005 John-Mark Bell <jmb202@ecs.soton.ac.uk>
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "rufl_internal.h"
static int rufl_family_list_cmp(const void *keyval, const void *datum);
static rufl_code rufl_place_in_cache(unsigned int font, unsigned int font_size,
const char *encoding, font_f f);
/**
* Find a font family.
*/
rufl_code rufl_find_font_family(const char *font_family,
rufl_style font_style, unsigned int *font,
unsigned int *slanted, struct rufl_character_set **charset)
{
const char **family;
unsigned int f;
unsigned int weight, slant, used_weight;
unsigned int search_direction;
family = bsearch(font_family, rufl_family_list,
rufl_family_list_entries,
sizeof rufl_family_list[0], rufl_family_list_cmp);
if (!family)
return rufl_FONT_NOT_FOUND;
weight = (font_style & 0xf) - 1;
assert(weight <= 8);
slant = font_style & rufl_SLANTED ? 1 : 0;
struct rufl_family_map_entry *e =
&rufl_family_map[family - rufl_family_list];
used_weight = weight;
if (weight <= 2)
search_direction = -1;
else
search_direction = +1;
while (1) {
if (e->font[used_weight][slant] != NO_FONT) {
/* the weight and slant is available */
f = e->font[used_weight][slant];
break;
}
if (e->font[used_weight][1 - slant] != NO_FONT) {
/* slanted, and non-slanted weight exists, or vv. */
f = e->font[used_weight][1 - slant];
break;
}
if (used_weight == 0) {
/* searched down without finding a weight: search up */
used_weight = weight + 1;
search_direction = +1;
} else if (used_weight == 8) {
/* searched up without finding a weight: search down */
used_weight = weight - 1;
search_direction = -1;
} else {
/* try the next weight in the current direction */
used_weight += search_direction;
}
}
if (font)
(*font) = f;
if (slanted)
(*slanted) = slant;
if (charset)
(*charset) = rufl_font_list[f].charset;
return rufl_OK;
}
/**
* Find a sized font, placing in the cache if necessary.
*/
rufl_code rufl_find_font(unsigned int font, unsigned int font_size,
const char *encoding, font_f *fhandle)
{
font_f f;
char font_name[80];
unsigned int i;
rufl_code code;
assert(fhandle != NULL);
for (i = 0; i != rufl_CACHE_SIZE; i++) {
/* Comparing pointers for the encoding is fine, as the
* encoding string passed to us is either:
*
* a) NULL
* or b) statically allocated
* or c) resides in the font's umap, which is constant
* for the lifetime of the application.
*/
if (rufl_cache[i].font == font &&
rufl_cache[i].size == font_size &&
rufl_cache[i].encoding == encoding)
break;
}
if (i != rufl_CACHE_SIZE) {
/* found in cache */
f = rufl_cache[i].f;
rufl_cache[i].last_used = rufl_cache_time++;
} else {
/* not found */
if (font == rufl_CACHE_CORPUS) {
if (encoding)
snprintf(font_name, sizeof font_name,
"Corpus.Medium\\E%s", encoding);
else
snprintf(font_name, sizeof font_name,
"Corpus.Medium");
} else {
if (encoding)
snprintf(font_name, sizeof font_name,
"%s\\E%s",
rufl_font_list[font].identifier,
encoding);
else
snprintf(font_name, sizeof font_name, "%s",
rufl_font_list[font].identifier);
}
rufl_fm_error = xfont_find_font(font_name,
font_size, font_size, 0, 0, &f, 0, 0);
if (rufl_fm_error) {
LOG("xfont_find_font: 0x%x: %s",
rufl_fm_error->errnum,
rufl_fm_error->errmess);
return rufl_FONT_MANAGER_ERROR;
}
/* place in cache */
code = rufl_place_in_cache(font, font_size, encoding, f);
if (code != rufl_OK)
return code;
}
(*fhandle) = f;
return rufl_OK;
}
int rufl_family_list_cmp(const void *keyval, const void *datum)
{
const char *key = keyval;
const char * const *entry = datum;
return strcasecmp(key, *entry);
}
/**
* Place a font into the recent-use cache, making space if necessary.
*/
rufl_code rufl_place_in_cache(unsigned int font, unsigned int font_size,
const char *encoding, font_f f)
{
unsigned int i;
unsigned int max_age = 0;
unsigned int evict = 0;
for (i = 0; i != rufl_CACHE_SIZE; i++) {
if (rufl_cache[i].font == rufl_CACHE_NONE) {
evict = i;
break;
} else if (max_age < rufl_cache_time -
rufl_cache[i].last_used) {
max_age = rufl_cache_time -
rufl_cache[i].last_used;
evict = i;
}
}
if (rufl_cache[evict].font != rufl_CACHE_NONE) {
rufl_fm_error = xfont_lose_font(rufl_cache[evict].f);
if (rufl_fm_error)
return rufl_FONT_MANAGER_ERROR;
}
rufl_cache[evict].font = font;
rufl_cache[evict].size = font_size;
rufl_cache[evict].encoding = encoding;
rufl_cache[evict].f = f;
rufl_cache[evict].last_used = rufl_cache_time++;
return rufl_OK;
}
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