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Make readVersion16Dot16 work.

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treeform 2021-09-02 10:30:45 -07:00
parent 0b8df86337
commit 439c14ee5b
1 changed files with 32 additions and 17 deletions
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49
src/pixie/fontformats/opentype.nim
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@ -359,6 +359,17 @@ proc readLongDateTime(buf: string, offset: int): float64 =
## January 1, 1904, UTC.
buf.readInt64(offset).swap().float64 - 2082844800
proc readVersion16Dot16(buf: string, offset: int): float32 =
## Version16Dot16 is a packed value: the upper 16 bits comprise a major
## version number, and the lower 16 bits, a minor version
let
data = buf.readUint32(offset + 0).swap()
majorDigit = (data and 0x000F0000) shr 16
minorDigit = (data and 0x0000F000) shr 12
if majorDigit > 9 or minorDigit > 9:
failUnsupported("invalid version format")
majorDigit.float32 + minorDigit.float32 / 10
proc parseCmapTable(buf: string, offset: int): CmapTable =
var i = offset
buf.eofCheck(i + 4)
@ -516,23 +527,27 @@ proc parseMaxpTable(buf: string, offset: int): MaxpTable =
buf.eofCheck(offset + 32)
result = MaxpTable()
result.version = buf.readFixed32(offset + 0)
if result.version != 1.0:
result.version = buf.readVersion16Dot16(offset + 0)
case result.version
of 0.5:
result.numGlyphs = buf.readUint16(offset + 4).swap()
of 1.0:
result.numGlyphs = buf.readUint16(offset + 4).swap()
result.maxPoints = buf.readUint16(offset + 6).swap()
result.maxContours = buf.readUint16(offset + 8).swap()
result.maxCompositePoints = buf.readUint16(offset + 10).swap()
result.maxCompositeContours = buf.readUint16(offset + 12).swap()
result.maxZones = buf.readUint16(offset + 14).swap()
result.maxTwilightPoints = buf.readUint16(offset + 16).swap()
result.maxStorage = buf.readUint16(offset + 18).swap()
result.maxFunctionDefs = buf.readUint16(offset + 20).swap()
result.maxInstructionDefs = buf.readUint16(offset + 22).swap()
result.maxStackElements = buf.readUint16(offset + 24).swap()
result.maxSizeOfInstructions = buf.readUint16(offset + 26).swap()
result.maxComponentElements = buf.readUint16(offset + 28).swap()
result.maxComponentDepth = buf.readUint16(offset + 30).swap()
else:
failUnsupported("Maxp version")
result.numGlyphs = buf.readUint16(offset + 4).swap()
result.maxPoints = buf.readUint16(offset + 6).swap()
result.maxContours = buf.readUint16(offset + 8).swap()
result.maxCompositePoints = buf.readUint16(offset + 10).swap()
result.maxCompositeContours = buf.readUint16(offset + 12).swap()
result.maxZones = buf.readUint16(offset + 14).swap()
result.maxTwilightPoints = buf.readUint16(offset + 16).swap()
result.maxStorage = buf.readUint16(offset + 18).swap()
result.maxFunctionDefs = buf.readUint16(offset + 20).swap()
result.maxInstructionDefs = buf.readUint16(offset + 22).swap()
result.maxStackElements = buf.readUint16(offset + 24).swap()
result.maxSizeOfInstructions = buf.readUint16(offset + 26).swap()
result.maxComponentElements = buf.readUint16(offset + 28).swap()
result.maxComponentDepth = buf.readUint16(offset + 30).swap()
proc parseHmtxTable(
buf: string, offset: int, hhea: HheaTable, maxp: MaxpTable
@ -1220,7 +1235,7 @@ proc parsePostTable(buf: string, offset: int): PostTable =
buf.eofCheck(offset + 14)
result = PostTable()
result.version = buf.readFixed32(offset + 0)
result.version = buf.readVersion16Dot16(offset + 0)
result.italicAngle = buf.readFixed32(offset + 4)
result.underlinePosition = buf.readInt16(offset + 8).swap()
result.underlineThickness = buf.readInt16(offset + 10).swap()