Wrote the initial version of the final code for converting Core Text traits into libui traits.
This commit is contained in:
Pietro Gagliardi
parent
2481610ee4
commit
3108f65b39
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// 1 november 2017
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#import "uipriv_darwin.h"
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static BOOL fontRegistered(CTFontDescriptorRef desc)
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{
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CFNumberRef scope;
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CTFontManagerScope val;
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scope = (CFNumberRef) CTFontDescriptorCopyAttribute(desc, kCTFontRegistrationScopeAttribute);
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if (scope == NULL)
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// header says this should be treated as the same as not registered
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return NO;
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if (CFNumberGetValue(scope, kCFNumberSInt32Type, &val) == false) {
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// TODO
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CFRelease(scope);
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return NO;
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}
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CFRelease(scope);
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// examination of Core Text shows this is accurate
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return val != kCTFontManagerScopeNone;
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}
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static BOOL getTraits(CTFontDescriptorRef desc, CTFontSymbolicTraits *symbolic, double *weight, double *width)
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{
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CFDictionaryRef traits = NULL;
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CFNumberRef num = NULL;
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traits = (CFDictionaryRef) CTFontDescriptorCopyAttribute(desc, kCTFontTraitsAttribute);
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if (traits == NULL)
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return NO;
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num = (CFNumberRef) CFDictionaryGetValue(traits, kCTFontSymbolicTrait);
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if (num == NULL)
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goto fail;
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if (CFNumberGetValue(num, kCFNumberSInt32Type, symbolic) == false)
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goto fail;
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num = (CFNumberRef) CFDictionaryGetValue(traits, kCTFontWeightTrait);
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if (num == NULL)
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goto fail;
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if (CFNumberGetValue(num, kCFNumberDoubleType, weight) == false)
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goto fail;
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num = (CFNumberRef) CFDictionaryGetValue(traits, kCTFontWidthTrait);
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if (num == NULL)
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goto fail;
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if (CFNumberGetValue(num, kCFNumberDoubleType, width) == false)
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goto fail;
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CFRelease(traits);
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return YES;
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fail:
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CFRelease(traits);
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return NO;
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}
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// Core Text doesn't seem to differentiate between Italic and Oblique.
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// Pango's Core Text code just does a g_strrstr() (backwards case-sensitive search) for "Oblique" in the font's style name (see https://git.gnome.org/browse/pango/tree/pango/pangocoretext-fontmap.c); let's do that too I guess
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static uiDrawTextFontItalic guessItalicOblique(CTFontDescriptorRef desc)
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{
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CFStringRef styleName;
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BOOL isOblique;
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isOblique = NO; // default value
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styleName = (CFStringRef) CTFontDescriptorCopyAttribute(desc, kCTFontStyleNameAttribute);
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if (styleName != NULL) {
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CFRange range;
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range = CFStringFind(styleName, CFSTR("Oblique"), kCFCompareBackwards);
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if (range.location != kCFNotFound)
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isOblique = YES;
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CFRelease(styleName);
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}
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if (isOblique)
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return uiDrawFontItalicOblique;
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return uiDrawFontItalicItalic;
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}
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// Core Text does (usWidthClass - 0.5) x 10
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// this roughly maps to our values with increments of 0.1, except for the fact 0 and 10 are allowed by Core Text, despite being banned by TrueType and OpenType themselves
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// we'll just treat them as identical to 1 and 9, respectively
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static const uiDrawFontStretch os2WidthsToStretches[] = {
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uiDrawTextStretchUltraCondensed,
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uiDrawTextStretchUltraCondensed,
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uiDrawTextStretchExtraCondensed,
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uiDrawTextStretchCondensed,
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uiDrawTextStretchSemiCondensed,
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uiDrawTextStretchNormal,
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uiDrawTextStretchSemiExpanded,
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uiDrawTextStretchExpanded,
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uiDrawTextStretchExtraExpanded,
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uiDrawTextStretchUltraExpanded,
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uiDrawTextStretchUltraExpanded,
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};
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static const CFStringRef exceptions[] = {
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CFSTR("LucidaGrande"),
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CFSTR(".LucidaGrandeUI"),
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CFSTR("STHeiti"),
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CFSTR("STXihei"),
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CFSTR("TimesNewRomanPSMT"),
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NULL,
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};
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static void trySecondaryOS2Values(CTFontDescriptorRef desc, uiDrawFontDescriptor *out, BOOL *hasWeight, BOOL *hasWidth)
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{
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CTFontRef font;
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CFDataRef os2;
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uint16_t usWeightClass, usWidthClass;
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CFStringRef psname;
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CFStringRef *ex;
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*hasWeight = NO;
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*hasWidth = NO;
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// only applies to unregistered fonts
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if (fontRegistered(desc))
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return;
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font = CTFontCreateWithFontDescriptor(desc, 0.0, NULL);
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os2 = CTFontCopyTable(font, kCTFontTableOS2, kCTFontTableOptionNoOptions);
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if (os2 == NULL) {
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// no OS2 table, so no secondary values
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CFRelease(font);
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return;
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}
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if (CFDataGetLength(os2) > 77) {
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const UInt8 *b;
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b = CFDataGetBytePtr(os2);
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usWeightClass = ((uint16_t) (b[4])) << 8;
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usWeightClass |= (uint16_t) (b[5]);
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if (usWeightClass <= 1000) {
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if (usWeightClass < 11)
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usWeigthClass *= 100;
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*hasWeight = YES;
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}
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usWidthClass = ((uint16_t) (b[6])) << 8;
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usWidthClass |= (uint16_t) (b[7]);
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if (usWidthClass <= 10)
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*hasWidth = YES;
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} else {
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usWeightClass = 0;
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*hasWeight = YES;
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usWidthClass = 0;
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*hasWidth = YES;
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}
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if (*hasWeight)
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// we can just use this directly
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out->Weight = usWeightClass;
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if (*hasWidth)
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out->Stretch = os2WidthsToStretches[usWidthClass];
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CFRelease(os2);
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// don't use secondary weights in the event of special predefined names
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psname = CTFontCopyPostScriptName(font);
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for (ex = exceptions; *ex != NULL; ex++)
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if (CFEqual(psname, *ex)) {
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*hasWeight = NO;
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break;
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}
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CFRelease(psname);
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CFRelease(font);
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}
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static const CFStringRef subfamilyKeys[] = {
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kCTFontSubFamilyNameKey,
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// TODO explicitly mark these as undocumented
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CFSTR("CTFontPreferredSubFamilyName"),
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kCTFontFullNameKey,
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CFSTR("CTFontPreferredFamilyName"),
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kCTFontFamilyNameKey,
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NULL,
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};
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static BOOL testTTFOTFSubfamilyNames(CTFontDescriptorRef desc, CFStringRef want)
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{
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CFNumberRef num;
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CTFontFormat type;
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CGFontRef font;
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CFString *key;
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num = (CFNumberRef) CTFontDescriptorCopyAttribute(desc, kCTFontFormatAttribute);
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if (num == NULL) {
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// TODO
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return NO;
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}
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if (CFNumberGetValue(num, kCFNumberSInt32Type, &type) == false) {
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// TODO
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CFRelease(num);
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return NO;
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}
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CFRelease(num);
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switch (type) {
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case kCTFontFormatOpenTypePostScript:
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case kCTFontFormatOpenTypeTrueType:
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case kCTFontFormatTrueType:
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break;
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default:
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return NO;
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}
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font = CTFontCreateWithFontDescriptor(desc, 0.0, NULL);
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for (key = subfamilyKeys; *key != NULL; key++) {
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CFStringRef val;
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CFRange range;
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val = CTFontCopyName(font, *key);
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if (val == NULL)
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continue;
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range.location = 0;
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range.length = CFStringGetLength(val);
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if (CFStringFindWithOptions(val, want, range,
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(kCFCompareCaseInsensitive | kCFCompareBackwards | kCFCompareNonliteral), NULL) != false) {
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CFRelease(val);
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CFRelease(font);
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return YES;
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}
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CFRelease(val);
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}
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CFRelease(font);
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return NO;
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}
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// work around a bug in libFontRegistry.dylib
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static BOOL shouldReallyBeThin(CTFontDescriptorRef desc)
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{
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return testTTFOTFSubfamilyNames(desc, CFSTR("W1"));
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}
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// work around a bug in libFontRegistry.dylib
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static BOOL shouldReallyBeSemiCondensed(CTFontDescriptorRef desc)
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{
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return testTTFOTFSubfamilyNames(desc, CFSTR("Semi Condensed"));
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}
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void processFontTraits(CTFontDescriptorRef desc, uiDrawFontDescriptor *out)
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{
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CTFontSymbolicTraits symbolic;
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double weight;
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double width;
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BOOL hasWeight, hasWidth;
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uint16_t usWeightClasss, usWidthClass;
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CTFontRef font;
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if (!getTraits(desc, &symbolic, &weight, &width)) {
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// TODO
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goto fail;
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}
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out->Italic = uiDrawTextItalicNormal;
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if ((symbolic & kCTFontItalicTrait) != 0)
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out->Italic = guessItalicOblique(desc);
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hasWeight = NO;
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hasWidth = NO;
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trySecondaryOS2Values(desc, out, &hasWeight, &hasWidth);
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if (!hasWeight)
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// TODO this scale is a bit lopsided
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if (weight <= -0.7)
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out->Weight = uiDrawTextWeightThin;
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else if (weight <= -0.5)
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out->Weight = uiDrawTextWeightUltraLight;
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else if (weight <= -0.3)
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out->Weight = uiDrawTextWeightLight;
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else if (weight <= -0.23) {
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out->Weight = uiDrawTextWeightBook;
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if (shouldReallyBeThin(desc))
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out->Weight = uiDrawTextWeightThin;
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} else if (weight <= 0.0)
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out->Weight = uiDrawTextWeightNormal;
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else if (weight <= 0.23)
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out->Weight = uiDrawTextWeightMedium;
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else if (weight <= 0.3)
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out->Weight = uiDrawTextWeightSemiBold;
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else if (weight <= 0.4)
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out->Weight = uiDrawTextWeightBold;
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else if (weight <= 0.5)
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out->Weight = uiDrawTextWeightUltraBold;
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else if (weight <= 0.7)
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out->Weight = uiDrawTextWeightHeavy;
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else
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out->Weight = uiDrawTextWeightUltraHeavy;
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if (!hasWidth)
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// TODO this scale is a bit lopsided
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if (width <= -0.7) {
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out->Stretch = uiDrawTextStretchUltraCondensed;
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if (shouldReallyBeSemiCondensed(desc))
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out->Stretch = uiDrawTextStretchSemiCondensed;
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} else if (width <= -0.5)
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out->Stretch = uiDrawTextStretchExtraCondensed;
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else if (width <= -0.2)
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out->Stretch = uiDrawTextStretchCondensed;
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else if (width <= -0.1)
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out->Stretch = uiDrawTextStretchSemiCondensed;
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else if (width <= 0.0)
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out->Stretch = uiDrawTextStretchNormal;
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else if (width <= 0.1)
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out->Stretch = uiDrawTextStretchSemiExpanded;
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else if (width <= 0.2)
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out->Stretch = uiDrawTextStretchExpanded;
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else if (width <= 0.6)
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out->Stretch = uiDrawTextStretchExtraExpanded;
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else
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out->Stretch = uiDrawTextStretchUltraExpanded;
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}
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