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/*
* Copyright (C) 2013 Stefano Pigozzi <stefano.pigozzi@gmail.com>
*
* This file is part of libass.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#ifdef CONFIG_CORETEXT
#include <CoreFoundation/CoreFoundation.h>
#include <CoreText/CoreText.h>
#include "ass_coretext.h"
static char *cfstr2buf(CFStringRef string)
{
const char *buf_ptr = CFStringGetCStringPtr(string, kCFStringEncodingUTF8);
if (buf_ptr) {
return strdup(buf_ptr);
} else {
size_t buf_len = CFStringGetLength(string) + 1;
char *buf = malloc(buf_len);
CFStringGetCString(string, buf, buf_len, kCFStringEncodingUTF8);
return buf;
}
}
static void destroy_font(void *priv)
{
CFCharacterSetRef set = priv;
CFRelease(set);
}
static int check_glyph(void *priv, uint32_t code)
{
CFCharacterSetRef set = priv;
if (!set)
return 1;
if (code == 0)
return 1;
return CFCharacterSetIsLongCharacterMember(set, code);
}
static char *get_font_file(CTFontDescriptorRef fontd)
{
CFURLRef url = CTFontDescriptorCopyAttribute(fontd, kCTFontURLAttribute);
CFStringRef path = CFURLCopyFileSystemPath(url, kCFURLPOSIXPathStyle);
char *buffer = cfstr2buf(path);
CFRelease(path);
CFRelease(url);
return buffer;
}
static void get_name(CTFontDescriptorRef fontd, CFStringRef attr,
char **array, int *idx)
{
CFStringRef name = CTFontDescriptorCopyAttribute(fontd, attr);
if (name) {
array[*idx] = cfstr2buf(name);
CFRelease(name);
*idx += 1;
}
}
static void get_trait(CFDictionaryRef traits, CFStringRef attribute,
float *trait)
{
CFNumberRef cftrait = CFDictionaryGetValue(traits, attribute);
if (!CFNumberGetValue(cftrait, kCFNumberFloatType, trait))
*trait = 0.0;
}
static void get_font_traits(CTFontDescriptorRef fontd,
ASS_FontProviderMetaData *meta)
{
float weight, slant, width;
CFDictionaryRef traits =
CTFontDescriptorCopyAttribute(fontd, kCTFontTraitsAttribute);
get_trait(traits, kCTFontWeightTrait, &weight);
get_trait(traits, kCTFontSlantTrait, &slant);
get_trait(traits, kCTFontWidthTrait, &width);
CFRelease(traits);
// Printed all of my system fonts (see if'deffed code below). Here is how
// CoreText 'normalized' weights maps to CSS/libass:
// opentype: 0 100 200 300 400 500 600 700 800 900
// css: LIGHT REG MED SBOLD BOLD BLACK EXTRABL
// libass: LIGHT MEDIUM BOLD
// coretext: -0.4 0.0 0.23 0.3 0.4 0.62
if (weight >= 0.62)
meta->weight = 800;
else if (weight >= 0.4)
meta->weight = 700;
else if (weight >= 0.3)
meta->weight = 600;
else if (weight >= 0.23)
meta->weight = 500;
else if (weight >= -0.4)
meta->weight = 400;
else
meta->weight = 200;
if (slant > 0.03)
meta->slant = FONT_SLANT_ITALIC;
else
meta->slant = FONT_SLANT_NONE;
if (width <= -0.2)
meta->width = FONT_WIDTH_CONDENSED;
else if (width >= 0.2)
meta->width = FONT_WIDTH_EXPANDED;
else
meta->width = FONT_WIDTH_NORMAL;
#if 0
char *name[1];
int idx = 0;
get_name(fontd, kCTFontDisplayNameAttribute, name, &idx);
char *file = get_font_file(fontd);
printf(
"Font traits for: %-40s [%-50s] "
"<slant: %f, %03d>, <weight: (%f, %03d)>, <width: %f, %03d>\n",
name[0], file,
slant, meta->slant, weight, meta->weight, width, meta->width);
free(name[0]);
free(file);
#endif
}
static void scan_fonts(ASS_Library *lib, ASS_FontProvider *provider)
{
ASS_FontProviderMetaData meta;
char *families[1];
char *identifiers[1];
char *fullnames[1];
CTFontCollectionRef coll = CTFontCollectionCreateFromAvailableFonts(NULL);
CFArrayRef fontsd = CTFontCollectionCreateMatchingFontDescriptors(coll);
for (int i = 0; i < CFArrayGetCount(fontsd); i++) {
CTFontDescriptorRef fontd = CFArrayGetValueAtIndex(fontsd, i);
int index = -1;
char *path = get_font_file(fontd);
if (strcmp("", path) == 0) {
// skip the font if the URL field in the font descriptor is empty
free(path);
continue;
}
memset(&meta, 0, sizeof(meta));
get_font_traits(fontd, &meta);
get_name(fontd, kCTFontFamilyNameAttribute, families, &meta.n_family);
meta.families = families;
int zero = 0;
get_name(fontd, kCTFontNameAttribute, identifiers, &zero);
get_name(fontd, kCTFontDisplayNameAttribute, fullnames, &meta.n_fullname);
meta.fullnames = fullnames;
CFCharacterSetRef chset =
CTFontDescriptorCopyAttribute(fontd, kCTFontCharacterSetAttribute);
ass_font_provider_add_font(provider, &meta, path, index,
identifiers[0], (void*)chset);
for (int j = 0; j < meta.n_family; j++)
free(meta.families[j]);
for (int j = 0; j < meta.n_fullname; j++)
free(meta.fullnames[j]);
free(identifiers[0]);
free(path);
}
CFRelease(fontsd);
CFRelease(coll);
}
static ASS_FontProviderFuncs coretext_callbacks = {
NULL,
check_glyph,
destroy_font,
NULL
};
ASS_FontProvider *
ass_coretext_add_provider(ASS_Library *lib, ASS_FontSelector *selector)
{
ASS_FontProvider *provider =
ass_font_provider_new(selector, &coretext_callbacks, NULL);
scan_fonts(lib, provider);
return provider;
}
#endif
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