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[coretext] Start adding support for features 

Unlike AAT, looks like with CoreText very few OT features can be mapped.
:(
This commit is contained in:
Behdad Esfahbod 2013-08-07 21:08:54 -04:00
parent bdd8873fd8
commit a782a5e9a3
1 changed files with 55 additions and 12 deletions
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67
src/hb-coretext.cc
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@ -205,25 +205,68 @@ _hb_coretext_shape (hb_shape_plan_t *shape_plan,
pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1));
}
}
unsigned int *log_clusters = (unsigned int *) (pchars + chars_len);
if (num_features)
{
/* Need log_clusters to assign features. */
chars_len = 0;
for (unsigned int i = 0; i < buffer->len; i++)
{
hb_codepoint_t c = buffer->info[i].codepoint;
unsigned int cluster = buffer->info[i].cluster;
log_clusters[chars_len++] = cluster;
if (c >= 0x10000 && c < 0x110000)
log_clusters[chars_len++] = cluster; /* Surrogates. */
}
}
#undef utf16_index
CFStringRef string_ref = CFStringCreateWithCharactersNoCopy (kCFAllocatorDefault,
CFStringRef string_ref = CFStringCreateWithCharactersNoCopy (NULL,
pchars, chars_len,
kCFAllocatorNull);
CFDictionaryRef attrs = CFDictionaryCreate (kCFAllocatorDefault,
(const void**) &kCTFontAttributeName,
(const void**) &font_data->ct_font,
1, /* count of attributes */
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
/* TODO: support features */
CFAttributedStringRef attr_string = CFAttributedStringCreate (kCFAllocatorDefault, string_ref, attrs);
CFMutableAttributedStringRef attr_string = CFAttributedStringCreateMutable (NULL, chars_len);
CFAttributedStringReplaceString (attr_string, CFRangeMake (0, 0), string_ref);
CFRelease (string_ref);
CFRelease (attrs);
CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
kCTFontAttributeName, font_data->ct_font);
for (unsigned int i = 0; i < num_features; i++)
{
CFStringRef a = NULL;
unsigned int v = features[i].value;
switch (features[i].tag)
{
case HB_TAG ('l','i','g','a'): a = kCTLigatureAttributeName; v = v ? 1 : 0; break;
case HB_TAG ('d','l','i','g'): a = kCTLigatureAttributeName; v = v ? 2 : 1; break;
case HB_TAG ('e','x','p','t'): a = kCTCharacterShapeAttributeName; v = v ? 11 : 16; break;
case HB_TAG ('j','s','7','8'): a = kCTCharacterShapeAttributeName; v = v ? 3 : 16; break;
case HB_TAG ('j','s','8','3'): a = kCTCharacterShapeAttributeName; v = v ? 4 : 16; break;
case HB_TAG ('j','s','9','0'): a = kCTCharacterShapeAttributeName; v = v ? 5 : 16; break;
case HB_TAG ('s','m','p','l'): a = kCTCharacterShapeAttributeName; v = v ? 2 : 16; break;
case HB_TAG ('t','r','a','d'): a = kCTCharacterShapeAttributeName; v = v ? 1 : 16; break;
}
if (!a)
continue;
CFTypeRef vref = CFNumberCreate (NULL, kCFNumberIntType, &v);
unsigned int start = features[i].start;
unsigned int end = features[i].end;
for (unsigned int j = 0; j < chars_len; j++)
{
if (log_clusters[j] < start || log_clusters[j] >= end)
continue;
unsigned int range_start = j;
while (j < chars_len && log_clusters[j] >= start && log_clusters[j] < end)
j++;
CFAttributedStringSetAttribute (attr_string, CFRangeMake (range_start, j - range_start), a, vref);
}
CFRelease (vref);
}
CTLineRef line = CTLineCreateWithAttributedString (attr_string);
CFRelease (attr_string);