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// 1 november 2017
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#import "uipriv_darwin.h"
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#import "attrstr.h"
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// This is the part of the font style matching and normalization code
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// that handles fonts that use a traits dictionary.
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//
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// Matching stupidity: Core Text requires an **exact match for the
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// entire traits dictionary**, otherwise it will **drop ALL the traits**.
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//
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// Normalization stupidity: Core Text uses its own scaled values for
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// weight and width, but the values are different if the font is not
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// registered and if said font is TrueType or OpenType. The values
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// for all other cases do have some named constants starting with
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// OS X 10.11, but even these aren't very consistent in practice.
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//
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// Of course, none of this is documented anywhere, so I had to do
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// both trial-and-error AND reverse engineering to figure out what's
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// what. We'll just convert Core Text's values into libui constants
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// and use those for matching.
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static BOOL fontRegistered(uiprivFontStyleData *d)
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{
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if (![d hasRegistrationScope])
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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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// examination of Core Text shows this is accurate
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return [d registrationScope] != kCTFontManagerScopeNone;
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}
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// Core Text does (usWidthClass / 10) - 0.5 here.
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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 uiTextStretch os2WidthsToStretches[] = {
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uiTextStretchUltraCondensed,
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uiTextStretchUltraCondensed,
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uiTextStretchExtraCondensed,
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uiTextStretchCondensed,
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uiTextStretchSemiCondensed,
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uiTextStretchNormal,
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uiTextStretchSemiExpanded,
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uiTextStretchExpanded,
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uiTextStretchExtraExpanded,
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uiTextStretchUltraExpanded,
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uiTextStretchUltraExpanded,
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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(uiprivFontStyleData *d, uiFontDescriptor *out, BOOL *hasWeight, BOOL *hasWidth)
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{
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CFDataRef os2;
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uint16_t usWeightClass, usWidthClass;
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CFStringRef psname;
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const 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(d))
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return;
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os2 = [d table:kCTFontTableOS2];
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if (os2 == NULL)
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// no OS2 table, so no secondary values
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return;
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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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usWeightClass *= 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 = [d postScriptName];
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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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}
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static BOOL testTTFOTFSubfamilyName(CFStringRef name, CFStringRef want)
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{
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CFRange range;
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if (name == NULL)
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return NO;
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range.location = 0;
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range.length = CFStringGetLength(name);
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return CFStringFindWithOptions(name, want, range,
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(kCFCompareCaseInsensitive | kCFCompareBackwards | kCFCompareNonliteral), NULL) != false;
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}
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static BOOL testTTFOTFSubfamilyNames(uiprivFontStyleData *d, CFStringRef want)
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{
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switch ([d fontFormat]) {
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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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if (testTTFOTFSubfamilyName([d preferredSubFamilyName], want))
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return YES;
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if (testTTFOTFSubfamilyName([d subFamilyName], want))
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return YES;
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if (testTTFOTFSubfamilyName([d fullName], want))
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return YES;
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if (testTTFOTFSubfamilyName([d preferredFamilyName], want))
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return YES;
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return testTTFOTFSubfamilyName([d familyName], want);
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}
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// work around a bug in libFontRegistry.dylib
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static BOOL shouldReallyBeThin(uiprivFontStyleData *d)
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{
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return testTTFOTFSubfamilyNames(d, CFSTR("W1"));
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}
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// work around a bug in libFontRegistry.dylib
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static BOOL shouldReallyBeSemiCondensed(uiprivFontStyleData *d)
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{
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return testTTFOTFSubfamilyNames(d, CFSTR("Semi Condensed"));
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}
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void uiprivProcessFontTraits(uiprivFontStyleData *d, uiFontDescriptor *out)
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{
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double weight, width;
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BOOL hasWeight, hasWidth;
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hasWeight = NO;
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hasWidth = NO;
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trySecondaryOS2Values(d, out, &hasWeight, &hasWidth);
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weight = [d weight];
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width = [d width];
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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 = uiTextWeightThin;
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else if (weight <= -0.5)
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out->Weight = uiTextWeightUltraLight;
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else if (weight <= -0.3)
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out->Weight = uiTextWeightLight;
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else if (weight <= -0.23) {
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out->Weight = uiTextWeightBook;
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if (shouldReallyBeThin(d))
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out->Weight = uiTextWeightThin;
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} else if (weight <= 0.0)
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out->Weight = uiTextWeightNormal;
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else if (weight <= 0.23)
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out->Weight = uiTextWeightMedium;
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else if (weight <= 0.3)
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out->Weight = uiTextWeightSemiBold;
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else if (weight <= 0.4)
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out->Weight = uiTextWeightBold;
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else if (weight <= 0.5)
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out->Weight = uiTextWeightUltraBold;
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else if (weight <= 0.7)
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out->Weight = uiTextWeightHeavy;
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else
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out->Weight = uiTextWeightUltraHeavy;
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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 = uiTextStretchUltraCondensed;
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if (shouldReallyBeSemiCondensed(d))
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out->Stretch = uiTextStretchSemiCondensed;
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} else if (width <= -0.5)
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out->Stretch = uiTextStretchExtraCondensed;
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else if (width <= -0.2)
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out->Stretch = uiTextStretchCondensed;
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else if (width <= -0.1)
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out->Stretch = uiTextStretchSemiCondensed;
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else if (width <= 0.0)
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out->Stretch = uiTextStretchNormal;
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else if (width <= 0.1)
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out->Stretch = uiTextStretchSemiExpanded;
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else if (width <= 0.2)
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out->Stretch = uiTextStretchExpanded;
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else if (width <= 0.6)
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out->Stretch = uiTextStretchExtraExpanded;
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else
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out->Stretch = uiTextStretchUltraExpanded;
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}
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