Use cascade list attribute to customize font fallback in Core Text

cascadelist.m

#import <ApplicationServices/ApplicationServices.h>
#import <Foundation/Foundation.h>

int main(int argc, char *argv[])
{
    if (argc != 2)
        return 0;

    NSAutoreleasePool *pool = [NSAutoreleasePool new];
    CFStringRef name = (CFStringRef) [NSString stringWithUTF8String: argv[1]];

    CFMutableDictionaryRef attributes = CFDictionaryCreateMutable(NULL, 0,
        &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
    CFDictionaryAddValue(attributes, kCTFontFamilyNameAttribute, name);

    const void *descriptors[] = { CTFontDescriptorCreateWithNameAndSize(CFSTR("STHeitiSC-Light"), 0) };
    CFArrayRef list = CFArrayCreate(kCFAllocatorDefault, descriptors, 1, &kCFTypeArrayCallBacks);
    CFDictionaryAddValue(attributes, kCTFontCascadeListAttribute, list);
    CFRelease(list);

    CTFontDescriptorRef descriptor = CTFontDescriptorCreateWithAttributes(attributes);
    CFRelease(attributes);

    CTFontRef font = CTFontCreateWithFontDescriptor(descriptor, 0.0, 0);
    CFRelease(descriptor);
    NSDictionary *stringAttributes = [NSDictionary dictionaryWithObject: (id) font
                                                                 forKey: (NSString *) kCTFontAttributeName];
    CFRelease(font);
    CFAttributedStringRef attrStr = CFAttributedStringCreate(kCFAllocatorDefault, CFSTR("test中文"), (CFDictionaryRef) stringAttributes);
    CFRelease(stringAttributes);
    CTLineRef line = CTLineCreateWithAttributedString(attrStr);
    CFRelease(attrStr);

    CFShow(line);
    CFRelease(line);
    return 0;
}