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CGFontCopyName() is too intricate to recreate. We might have to wind up calling it directly...

This commit is contained in:
Pietro Gagliardi 2017-10-21 02:54:39 -04:00
parent 9b28bd5ecd
commit 2858c56528
1 changed files with 55 additions and 4 deletions
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59
doc/export/ctweights
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@ -8,7 +8,7 @@ func (f *CTFont) IsRegistered() bool {
return n.(*CFNumber).Uint32Value() == kCTFontManagerScopeNone
}
xx this type is in libFontRegistry.dylib; functions like x_list.Prepend() are called things like x_list_prepend() there
// this type is in libFontRegistry.dylib; functions like x_list.Prepend() are called things like x_list_prepend() there
type x_list struct {
Data interface{}
Next *x_list
@ -44,6 +44,23 @@ func (x *x_list) Reverse() *x_list {
return old
}
func (x *x_list) Concat(y *x_list) *x_list {
if x == nil {
return y
}
start := x
z := x
for {
x = z
z = z.next
if z == nil {
break
}
}
x.next = y
return start
}
// based on CoreGraphics dylib's _CGFontCopyName
// note that this is different from the public API function CGFontCopyPostScriptName() (which is font type-independent)
// 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
@ -60,7 +77,7 @@ func (f *CGFont) CopyName(key int) (string, bool) {
b := table.Bytes()
n := table.Len()
xx this code looks weird, but we're imitating the assembly, or the effective effects thereof
// this code looks weird, but we're imitating the assembly, or the effective effects thereof
offCount := uint16(0)
offStringOffset := uint16(2)
if n > 1 {
@ -96,7 +113,7 @@ func (f *CGFont) CopyName(key int) (string, bool) {
}
pos := offNameRecords
if count == 0 {
xx TODO note assembly logic here
// TODO note assembly logic here
} else {
for {
var nr NameRecord
@ -145,7 +162,7 @@ func (f *CGFont) CopyName(key int) (string, bool) {
strpos := stringOffset + nr.Offset
if strpos >= n {
xx TODO put comment about imitating the assembly comparisons here
// TODO put comment about imitating the assembly comparisons here
} else {
realLen := nr.Length
strend = strpos + nr.Length
@ -175,6 +192,40 @@ func (f *CGFont) CopyName(key int) (string, bool) {
nameList = nameList.Reverse()
hasLanguageTags:
add_localized_names := func(platformID uint16, platformSpecificID uint16, to *x_list) *x_list {
out := (*x_list)(nil)
if nameList == nil {
xx TODO logic verbatim etc.
} else {
x := nameList
for {
name := (*sfnt_name_t)(x.data)
if name.PlatformID != platformID {
xx TODO
} else {
if platformSpecificID == 0xFFFF || name.PlatformSpecificID == platformSpecificID {
out = out.Prepend(name)
}
}
x = x.next
if x == nil {
break
}
}
}
out = out.Reverse()
return to.Concat(out)
}
localized := (*x_list)(nil)
localized = add_localized_names(0x1, 0xFFFF, localized)
localized = add_localized_names(0, 0xFFFF, localized)
localized = add_localized_names(0x3, 0xFFFF, localized)
localized = add_localized_names(0x1, 0, localized)
localized = add_localized_names(0x3, 0x9, localized)
localized = add_localized_names(0x3, 0x409, localized)
sysLocale := CFLocaleGetSystem()
}
// based on libFontRegistry.dylib's __ZNK8OS2Table15DetermineWeightERf — OS2Table::DetermineWeight(float&) const