More name table work.
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Pietro Gagliardi
parent
9731d2e836
commit
9b28bd5ecd
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@ -8,6 +8,42 @@ func (f *CTFont) IsRegistered() bool {
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return n.(*CFNumber).Uint32Value() == kCTFontManagerScopeNone
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}
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xx this type is in libFontRegistry.dylib; functions like x_list.Prepend() are called things like x_list_prepend() there
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type x_list struct {
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Data interface{}
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Next *x_list
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}
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func (x *x_list) Prepend(data interface{}) *x_list {
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y := malloc(sizeof (x_list))
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if y != nil {
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y.data = data
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y.next = x
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return y
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}
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return x
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}
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func (x *x_list) Reverse() *x_list {
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if x == nil {
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return nil
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}
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var old, next *x_list
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next = nil
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for {
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old = x
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x = old.next
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old.next = next
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next = old
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if x == nil {
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break
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}
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}
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return old
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}
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// based on CoreGraphics dylib's _CGFontCopyName
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// note that this is different from the public API function CGFontCopyPostScriptName() (which is font type-independent)
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// also note that in reality these keys are strings but the implementation of the function turns them into ints and only uses them as such
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@ -20,23 +56,27 @@ const (
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kCGFontNameKeyFontFamily = 0x1
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)
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func (f *CGFont) CopyName(key int) (string, bool) {
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var nameCount int
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var stringOffset int
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table := f.TableForTag('name')
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b := table.Bytes()
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n := table.Len()
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// the asm does some obtuse logic to get to these conditions, so I will simplify the logic here
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if n >= 4 {
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nameCount = int(uint16be(b[2:4]))
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} else {
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nameCount = 0
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xx this code looks weird, but we're imitating the assembly, or the effective effects thereof
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offCount := uint16(0)
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offStringOffset := uint16(2)
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if n > 1 {
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offCount = 2
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offStringOffset = 4
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}
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if n >= 6 {
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stringOffset = int(uint16be(b[4:6]))
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} else {
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stringOffset = 0
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count := uint16(0)
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if int(offCount) <= n {
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count = uint16be(b[offCount:offCount + 2])
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}
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offNameRecord := offStringOffset + 2
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stringOffset := uint16(0)
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if int(offNameRecord) <= n {
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stringOffset = uint16be(b[offStringOffset:offStringOffset + 2])
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}
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type NameRecord struct {
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@ -48,7 +88,93 @@ func (f *CGFont) CopyName(key int) (string, bool) {
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Offset uint16
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}
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pos := x
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var nameList *x_list
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addrStrings := offNameRecords + (12 * count)
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if addrStrings != stringOffset {
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goto hasLanguageTags
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}
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pos := offNameRecords
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if count == 0 {
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xx TODO note assembly logic here
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} else {
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for {
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var nr NameRecord
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nr.PlatformID = 0
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next := pos + 2
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if int(next) <= n {
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nr.PlatformID = uint16be(b[pos:pos + 2])
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pos = next
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}
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nr.PlatformSpecificID = 0
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next = pos + 2
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if int(next) <= n {
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nr.PlatformSpecificID = uint16be(b[pos:pos + 2])
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pos = next
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}
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nr.LanguageID = 0
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next = pos + 2
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if int(next) <= n {
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nr.LanguageID = uint16be(b[pos:pos + 2])
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pos = next
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}
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nr.NameID = 0
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next = pos + 2
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if int(next) <= n {
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nr.NameID = uint16be(b[pos:pos + 2])
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pos = next
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}
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nr.Length = 0
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next = pos + 2
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if int(next) <= n {
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nr.Length = uint16be(b[pos:pos + 2])
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pos = next
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}
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nr.Offset = 0
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next = pos + 2
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if int(next) <= n {
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nr.Offset = uint16be(b[pos:pos + 2])
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pos = next
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}
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strpos := stringOffset + nr.Offset
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if strpos >= n {
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xx TODO put comment about imitating the assembly comparisons here
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} else {
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realLen := nr.Length
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strend = strpos + nr.Length
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if strend > n {
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realLen = nr.Length - strpos
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strend = strpos + realLen
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}
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b := malloc(12 + realLen + 1)
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if b != nil {
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name := (*sfnt_name_t)(b)
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name.PlatformID = nr.PlatformID
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name.PlatformSpecificID = nr.PlatformSpecificID
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name.LanguageID = nr.LanguageID
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name.NameID = nr.NameID
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name.Length = realLen
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memcpy(&(name.Name), b[strpos:strend], realLen)
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name.Name[realLen] = 0
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nameList = nameList.Prepend(name)
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}
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}
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count--
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if count == 0 {
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break
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}
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}
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}
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nameList = nameList.Reverse()
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hasLanguageTags:
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}
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// based on libFontRegistry.dylib's __ZNK8OS2Table15DetermineWeightERf — OS2Table::DetermineWeight(float&) const
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