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Fix shaper ordering logic

This commit is contained in:
Behdad Esfahbod 2011-08-08 21:36:24 +02:00
parent cc797e0d53
commit 670c873499
1 changed files with 34 additions and 46 deletions
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80
src/hb-shape.cc
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@ -45,8 +45,8 @@ typedef hb_bool_t (*hb_shape_func_t) (hb_font_t *font,
const char *shaper_options);
#define HB_SHAPER_IMPLEMENT(name) {#name, hb_##name##_shape}
static const struct hb_shaper_pair_t {
const char name[16];
static struct hb_shaper_pair_t {
char name[16];
hb_shape_func_t func;
} shapers[] = {
/* v--- Add new shapers in the right place here */
@ -65,49 +65,42 @@ static struct static_shaper_list_t
static_shaper_list_t (void)
{
char *env = getenv ("HB_SHAPER_LIST");
shaper_list = NULL;
if (!env || !*env) {
fallback:
ASSERT_STATIC ((ARRAY_LENGTH (shapers) + 1) * sizeof (*shaper_list) <= sizeof (static_buffer));
shaper_list = (const char **) static_buffer;
unsigned int i;
for (i = 0; i < ARRAY_LENGTH (shapers); i++)
shaper_list[i] = shapers[i].name;
shaper_list[i] = NULL;
return;
if (env && *env)
{
/* Reorder shaper list to prefer requested shaper list. */
unsigned int i = 0;
char *end, *p = env;
for (;;) {
end = strchr (p, ',');
if (!end)
end = p + strlen (p);
for (unsigned int j = i; j < ARRAY_LENGTH (shapers); j++)
if (end - p == strlen (shapers[j].name) &&
0 == strncmp (shapers[j].name, p, end - p))
{
/* Reorder this shaper to position i */
struct hb_shaper_pair_t t = shapers[j];
memmove (&shapers[i + 1], &shapers[i], sizeof (shapers[i]) * (j - i));
shapers[i] = t;
i++;
}
if (!*end)
break;
else
p = end + 1;
}
}
unsigned int count = 3; /* initial, fallback, null */
for (const char *p = env; (p = strchr (p, ',')) && p++; )
count++;
unsigned int len = strlen (env);
if (count > 100 || len > 1000)
goto fallback;
len += count * sizeof (*shaper_list) + 1;
char *buffer = len < sizeof (static_buffer) ? static_buffer : (char *) malloc (len);
shaper_list = (const char **) buffer;
buffer += count * sizeof (*shaper_list);
len -= count * sizeof (*shaper_list);
strncpy (buffer, env, len);
count = 0;
shaper_list[count++] = buffer;
for (char *p = buffer; (p = strchr (p, ',')) && (*p = '\0', TRUE) && p++; )
shaper_list[count++] = p;
shaper_list[count++] = "fallback";
shaper_list[count] = NULL;
}
~static_shaper_list_t (void)
{
if ((char *) shaper_list != static_buffer)
free (shaper_list);
ASSERT_STATIC ((ARRAY_LENGTH (shapers) + 1) * sizeof (*shaper_list) <= sizeof (shaper_list));
unsigned int i;
for (i = 0; i < ARRAY_LENGTH (shapers); i++)
shaper_list[i] = shapers[i].name;
shaper_list[i] = NULL;
}
const char **shaper_list;
char static_buffer[32];
const char *shaper_list[ARRAY_LENGTH (shapers) + 1];
} static_shaper_list;
const char **
@ -124,11 +117,6 @@ hb_shape_full (hb_font_t *font,
const char *shaper_options,
const char **shaper_list)
{
/* TODO
* This function, and shaper_list handling need to be redone. */
if (likely (!shaper_list))
shaper_list = static_shaper_list.shaper_list;
if (likely (!shaper_list)) {
for (unsigned int i = 0; i < ARRAY_LENGTH (shapers); i++)
if (likely (shapers[i].func (font, buffer,