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//
// ZFont.m
// FontLabel
//
// Created by Kevin Ballard on 7/2/09.
// Copyright © 2009 Zynga Game Networks
//
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#import "ZFont.h"
@interface ZFont ()
@property (nonatomic, readonly) CGFloat ratio;
- (NSString *)copyNameTableEntryForID:(UInt16)nameID;
@end
@implementation ZFont
@synthesize cgFont=_cgFont, pointSize=_pointSize, ratio=_ratio;
+ (ZFont *)fontWithCGFont:(CGFontRef)cgFont size:(CGFloat)fontSize {
return [[[self alloc] initWithCGFont:cgFont size:fontSize] autorelease];
}
+ (ZFont *)fontWithUIFont:(UIFont *)uiFont {
NSParameterAssert(uiFont != nil);
CGFontRef cgFont = CGFontCreateWithFontName((CFStringRef)uiFont.fontName);
ZFont *zFont = [[self alloc] initWithCGFont:cgFont size:uiFont.pointSize];
CGFontRelease(cgFont);
return [zFont autorelease];
}
- (id)initWithCGFont:(CGFontRef)cgFont size:(CGFloat)fontSize {
if ((self = [super init])) {
_cgFont = CGFontRetain(cgFont);
_pointSize = fontSize;
_ratio = fontSize/CGFontGetUnitsPerEm(cgFont);
}
return self;
}
- (id)init {
NSAssert(NO, @"-init is not valid for ZFont");
return nil;
}
- (CGFloat)ascender {
return ceilf(self.ratio * CGFontGetAscent(self.cgFont));
}
- (CGFloat)descender {
return floorf(self.ratio * CGFontGetDescent(self.cgFont));
}
- (CGFloat)leading {
return (self.ascender - self.descender);
}
- (CGFloat)capHeight {
return ceilf(self.ratio * CGFontGetCapHeight(self.cgFont));
}
- (CGFloat)xHeight {
return ceilf(self.ratio * CGFontGetXHeight(self.cgFont));
}
- (NSString *)familyName {
if (_familyName == nil) {
_familyName = [self copyNameTableEntryForID:1];
}
return _familyName;
}
- (NSString *)fontName {
if (_fontName == nil) {
_fontName = [self copyNameTableEntryForID:4];
}
return _fontName;
}
- (NSString *)postScriptName {
if (_postScriptName == nil) {
_postScriptName = [self copyNameTableEntryForID:6];
}
return _postScriptName;
}
- (ZFont *)fontWithSize:(CGFloat)fontSize {
if (fontSize == self.pointSize) return self;
NSParameterAssert(fontSize > 0.0);
return [[[ZFont alloc] initWithCGFont:self.cgFont size:fontSize] autorelease];
}
- (BOOL)isEqual:(id)object {
if (![object isKindOfClass:[ZFont class]]) return NO;
ZFont *font = (ZFont *)object;
return (font.cgFont == self.cgFont && font.pointSize == self.pointSize);
}
- (NSString *)copyNameTableEntryForID:(UInt16)aNameID {
CFDataRef nameTable = CGFontCopyTableForTag(self.cgFont, 'name');
NSAssert1(nameTable != NULL, @"CGFontCopyTableForTag returned NULL for 'name' tag in font %@",
[(id)CFCopyDescription(self.cgFont) autorelease]);
const UInt8 * const bytes = CFDataGetBytePtr(nameTable);
NSAssert1(OSReadBigInt16(bytes, 0) == 0, @"name table for font %@ has bad version number",
[(id)CFCopyDescription(self.cgFont) autorelease]);
const UInt16 count = OSReadBigInt16(bytes, 2);
const UInt16 stringOffset = OSReadBigInt16(bytes, 4);
const UInt8 * const nameRecords = &bytes[6];
UInt16 nameLength = 0;
UInt16 nameOffset = 0;
NSStringEncoding encoding = 0;
for (UInt16 idx = 0; idx < count; idx++) {
const uintptr_t recordOffset = 12 * idx;
const UInt16 nameID = OSReadBigInt16(nameRecords, recordOffset + 6);
if (nameID != aNameID) continue;
const UInt16 platformID = OSReadBigInt16(nameRecords, recordOffset + 0);
const UInt16 platformSpecificID = OSReadBigInt16(nameRecords, recordOffset + 2);
encoding = 0;
// for now, we only support a subset of encodings
switch (platformID) {
case 0: // Unicode
encoding = NSUTF16StringEncoding;
break;
case 1: // Macintosh
switch (platformSpecificID) {
case 0:
encoding = NSMacOSRomanStringEncoding;
break;
}
case 3: // Microsoft
switch (platformSpecificID) {
case 1:
encoding = NSUTF16StringEncoding;
break;
}
}
if (encoding == 0) continue;
nameLength = OSReadBigInt16(nameRecords, recordOffset + 8);
nameOffset = OSReadBigInt16(nameRecords, recordOffset + 10);
break;
}
NSString *result = nil;
if (nameOffset > 0) {
const UInt8 *nameBytes = &bytes[stringOffset + nameOffset];
result = [[NSString alloc] initWithBytes:nameBytes length:nameLength encoding:encoding];
}
CFRelease(nameTable);
return result;
}
- (void)dealloc {
CGFontRelease(_cgFont);
[_familyName release];
[_fontName release];
[_postScriptName release];
[super dealloc];
}
@end
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