f
This commit is contained in:
treeform
parent
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commit
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1 changed files with 191 additions and 59 deletions
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@ -316,9 +316,6 @@ type
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size: uint8
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offsetSize: uint8
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CFFIndex = ref object
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objects: seq[string]
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CFFTopDict = ref object
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charStrings: int
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charset: int
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@ -330,8 +327,12 @@ type
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copyright: string
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encoding: int
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familyName: string
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fdArray: pointer
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fdSelect: pointer
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fdArray: int
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fdSelect: int
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fdArraySeq: seq[CFFTopDict]
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fdSelectSeq: seq[int]
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fontBBox: array[4, float32]
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fontMatrix: array[6, float32]
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fontName: string
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@ -342,9 +343,11 @@ type
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paintType: int
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private: array[2, float32]
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subrs: int
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subrsBias: int
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subrIndex: seq[string]
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defaultWidthX: int
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nominalWidthX: int
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ros: array[3, float32]
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ros: array[3, string]
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strokeWidth: int
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uidBase: pointer
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underlinePosition: int
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@ -356,18 +359,16 @@ type
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CFFTable = ref object
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## Contains the glyph outlines in PostScript format.
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header: CFFHeader
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nameIndex: CFFIndex
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topDictIndex: CFFIndex
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stringIndex: CFFIndex
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globalSubrIndex: CFFIndex
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nameIndex: seq[string]
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topDictIndex: seq[string]
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stringIndex: seq[string]
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globalSubrIndex: seq[string]
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topDict: CFFTopDict
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subrsBias: int
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subrIndex: CFFIndex
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charIndex: CFFIndex
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charIndex: seq[string]
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#charsets*: CFF..
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#charStringsIndex*: CFF..
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#privateDict*: CFF..
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isCID: bool
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OpenType* = ref object
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buf*: string
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@ -810,7 +811,7 @@ proc parseKernTable(buf: string, offset: int): KernTable =
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else:
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failUnsupported("Kern version")
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proc parseCFFIndex(buf: string, start: var int, stripZero = false): CFFIndex =
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proc parseCFFIndex(buf: string, start: var int, stripZero = false): seq[string] =
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proc getOffset(buf: string, offset, offSize: int): int =
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var v = 0
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@ -821,7 +822,6 @@ proc parseCFFIndex(buf: string, start: var int, stripZero = false): CFFIndex =
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# Compute all of the offsets first.
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var offsets: seq[int]
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result = CFFIndex()
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let count = buf.readUint16(start).swap().int
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var endOffset = 0
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var objectOffset = 0
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@ -844,7 +844,7 @@ proc parseCFFIndex(buf: string, start: var int, stripZero = false): CFFIndex =
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var value = buf[objectOffset + offsets[i] ..< objectOffset + offsets[i + 1]]
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if stripZero:
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value = value[0..^1] # ignore 0 at the end
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result.objects.add(value)
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result.add(value)
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start = endOffset
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const cffStandardStrings = [
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@ -935,24 +935,58 @@ proc shift[T](s: var seq[T]): T =
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## Pops from the front.
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result = s[0]
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s.delete(0)
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import print
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proc parseCFFCharstring(cff: CffTable, code: string): Path =
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proc calcCFFSubroutineBias(subrs: seq[string]): int =
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if subrs.len < 1240:
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107
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elif subrs.len < 33900:
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1131
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else:
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32768
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proc parseCFFCharstring(cff: CffTable, code: string, glyphIndex: int): Path =
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var p = newPath()
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var stack: seq[float32]
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# var nStems = 0
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var nStems = 0
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var haveWidth = false
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var x = 0f
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var y = 0f
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let
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subrs = cff.topDict.subrs
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subrsBias = cff.subrsBias
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var
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subrs: seq[string]
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subrsBias: int
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defaultWidthX: int
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nominalWidthX: int
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if cff.isCID:
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print cff.isCID
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let fdIndex = cff.topDict.fdSelectSeq[glyphIndex]
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print fdIndex
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let fdDict = cff.topDict.fdArraySeq[fdIndex]
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subrs = fdDict.subrIndex
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subrsBias = calcCFFSubroutineBias(subrs)
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defaultWidthX = fdDict.defaultWidthX
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nominalWidthX = fdDict.nominalWidthX
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else:
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subrs = cff.topDict.subrIndex
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subrsBias = cff.topDict.subrsBias
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defaultWidthX = cff.topDict.defaultWidthX
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nominalWidthX = cff.topDict.nominalWidthX
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var width = defaultWidthX.float32
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proc parseStems() =
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# The number of stem operators on the stack is always even.
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# If the value is uneven, that means a width is specified.
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print "parseStems", stack
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if stack.len mod 2 != 0 and not haveWidth:
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width = stack.shift() + nominalWidthX.float32
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nStems += stack.len shr 1
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stack.setLen(0)
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haveWidth = true
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proc parse(code: string) =
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var i = 0
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@ -961,6 +995,9 @@ proc parseCFFCharstring(cff: CffTable, code: string): Path =
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inc i
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case v:
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of 1, 3: # hstem vstem
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parseStems()
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of 4: # vmoveto
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if stack.len > 1 and not haveWidth:
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width = stack.shift() + nominalWidthX.float32
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@ -1005,7 +1042,8 @@ proc parseCFFCharstring(cff: CffTable, code: string): Path =
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of 10: # callsubr
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let codeIndex = stack.pop().int + subrsBias
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let subrCode = cff.subrIndex.objects[codeIndex]
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#print codeIndex, cff.subrIndex
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let subrCode = subrs[codeIndex]
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if subrCode.len > 0:
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parse(subrCode)
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@ -1018,6 +1056,13 @@ proc parseCFFCharstring(cff: CffTable, code: string): Path =
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haveWidth = true
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p.closePath()
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of 18: # hstemhm
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parseStems()
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of 19, 20: # hintmask, cntrmask
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parseStems()
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i += (nStems + 7) shr 3
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of 21: # rmoveto
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if stack.len > 2 and not haveWidth:
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width = stack.shift() + nominalWidthX.float32
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@ -1093,8 +1138,8 @@ proc parseCFFCharstring(cff: CffTable, code: string): Path =
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i += 2
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of 29: # callgsubr
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let codeIndex = stack.pop().int + subrsBias
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let subrCode = cff.globalSubrIndex.objects[codeIndex]
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let codeIndex = stack.pop().int + calcCFFSubroutineBias(cff.globalSubrIndex)
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let subrCode = cff.globalSubrIndex[codeIndex]
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if subrCode.len > 0:
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parse(subrCode)
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@ -1158,7 +1203,7 @@ proc parseCFFCharstring(cff: CffTable, code: string): Path =
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i += 1
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stack.add(float32(-(v - 251) * 256 - b1 - 108))
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else:
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failUnsupported("test me")
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#failUnsupported("test me")
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let
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b1 = code.readUint8(i + 0).int
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b2 = code.readUint8(i + 1).int
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@ -1169,9 +1214,10 @@ proc parseCFFCharstring(cff: CffTable, code: string): Path =
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((b1 shl 24) or (b2 shl 16) or (b3 shl 8) or b4).float32 / 65536f)
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parse(code)
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print $p
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return p
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proc parseCFFTable(buf: string, offset: int): CFFTable =
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proc parseCFFTable(buf: string, offset: int, maxp: MaxpTable): CFFTable =
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buf.eofCheck(offset + 32)
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result = CFFTable()
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@ -1190,16 +1236,6 @@ proc parseCFFTable(buf: string, offset: int): CFFTable =
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# contains binary glyphs
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result.globalSubrIndex = buf.parseCFFIndex(indexOffset)
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# Subroutines are encoded using the negative half of the number space.
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# See type 2 chapter 4.7 "Subroutine operators".
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result.subrsBias =
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if result.globalSubrIndex.objects.len < 1240:
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107
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elif result.globalSubrIndex.objects.len < 33900:
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1131
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else:
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32768
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# Parse a `CFF` DICT object.
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# A dictionary contains key-value pairs in a compact tokenized format.
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proc parseCFFDict(data: string, start, stop: int): seq[(int, seq[float64])] =
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@ -1335,12 +1371,12 @@ proc parseCFFTable(buf: string, offset: int): CFFTable =
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# "Top DICT"s found using an INDEX list.
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proc gatherCFFTopDicts(
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cff: CFFTable,
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maxp: MaxpTable,
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data: string,
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start: int,
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cffIndex,
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strings: seq[string]
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): seq[CFFTopDict] =
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for iTopDict in 0 ..< cffIndex.len:
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let
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cffTopDict = CFFTopDict()
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@ -1378,6 +1414,20 @@ proc parseCFFTable(buf: string, offset: int): CFFTable =
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result[i] = topDict[key][i].float32
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else:
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return default
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proc getArrStr[N: int](
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topDict: Table[string, seq[float64]],
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key: string,
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default: array[N, string],
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strings: seq[string]
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): array[N, string] =
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if key in topDict:
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for i in 0 ..< result.len:
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let index = topDict[key][i].int
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result[i] = getCFFString(strings, index)
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else:
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return default
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cffTopDict.charStrings = topDict.getInt("charStrings", 0)
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cffTopDict.charset = topDict.getInt("charset", 0)
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cffTopDict.charstringType = topDict.getInt("charstringType", 2)
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@ -1388,8 +1438,8 @@ proc parseCFFTable(buf: string, offset: int): CFFTable =
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cffTopDict.copyright = topDict.getStr("copyright", "")
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cffTopDict.encoding = topDict.getInt("encoding", 0)
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cffTopDict.familyName = topDict.getStr("familyName", "")
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# cffTopDict.fdArray: pointer
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# cffTopDict.fdSelect: pointer
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cffTopDict.fdArray = topDict.getInt("fdArray", 0)
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cffTopDict.fdSelect = topDict.getInt("fdSelect", 0)
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cffTopDict.fontBBox = topDict.getArr("fontBBox", [0f, 0f, 0f, 0f])
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cffTopDict.fontMatrix = topDict.getArr("fontMatrix",
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[0.001f, 0f, 0f, 0.001f, 0f, 0f])
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@ -1402,14 +1452,20 @@ proc parseCFFTable(buf: string, offset: int): CFFTable =
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cffTopDict.private = topDict.getArr("private", [0f, 0f])
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var privateSize = cffTopDict.private[0].int
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var privateOffset = cffTopDict.private[1].int
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var privateDict = parseCFFPrivateDict(
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buf[privateOffset + start ..< privateOffset + start + privateSize],
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strings
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)
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cffTopDict.defaultWidthX = privateDict.getInt("defaultWidthX", 0)
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cffTopDict.nominalWidthX = privateDict.getInt("nominalWidthX", 0)
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cffTopDict.subrs = privateDict.getInt("subrs", 0)
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# cffTopDict.ros: array[3, float32]
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if privateOffset != 0:
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var privateDict = parseCFFPrivateDict(
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buf[privateOffset + start ..< privateOffset + start + privateSize],
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strings
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)
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cffTopDict.defaultWidthX = privateDict.getInt("defaultWidthX", 0)
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cffTopDict.nominalWidthX = privateDict.getInt("nominalWidthX", 0)
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cffTopDict.subrs = privateDict.getInt("subrs", 0)
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if cffTopDict.subrs > 0:
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var subrOffset = cffTopDict.private[1].int + cffTopDict.subrs
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var subrOffset2 = subrOffset + offset
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cffTopDict.subrIndex = buf.parseCFFIndex(subrOffset2)
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cffTopDict.ros = topDict.getArrStr("ros", ["", "", ""], strings)
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cffTopDict.strokeWidth = topDict.getInt("strokeWidth", 0)
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# cffTopDict.uidBase: pointer
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cffTopDict.underlinePosition = topDict.getInt("underlinePosition", -100)
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@ -1419,20 +1475,95 @@ proc parseCFFTable(buf: string, offset: int): CFFTable =
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cffTopDict.weight = topDict.getStr("weight", "")
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result.add(cffTopDict)
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let topDicts = result.gatherCFFTopDicts(
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buf, offset, result.topDictIndex.objects, result.stringIndex.objects)
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let topDicts = result.gatherCFFTopDicts(maxp,
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buf, offset, result.topDictIndex, result.stringIndex)
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if topDicts.len == 0:
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failUnsupported("CFF no topDict")
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if topDicts.len > 1:
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failUnsupported("CFF multiple topDict")
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result.topDict = topDicts[0]
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# TODO: isCIDFont?
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# Subroutines are encoded using the negative half of the number space.
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# See type 2 chapter 4.7 "Subroutine operators".
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result.topDict.subrsBias =
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if result.globalSubrIndex.len < 1240:
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107
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elif result.globalSubrIndex.len < 33900:
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1131
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else:
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32768
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if result.topDict.ros[0] != "" and result.topDict.ros[1] != "":
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result.isCID = true
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var fdArrayOffset = result.topDict.fdArray + offset
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var fdSelectOffset = result.topDict.fdSelect + offset
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if fdArrayOffset == 0 or fdSelectOffset == 0:
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failUnsupported("CFF CID tables are missing")
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var fdArrayIndex = parseCFFIndex(buf, fdArrayOffset)
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result.topDict.fdArraySeq = result.gatherCFFTopDicts(maxp, buf, offset, fdArrayIndex, result.stringIndex)
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proc parseCFFFDSelect(buf: string, start, nGlyphs, fdArrayCount: int): seq[int] =
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print "here", buf.len, start, nGlyphs, fdArrayCount
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var at = start
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var format = buf.readUint8(at)
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inc at
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print format
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# if (format === 0) {
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# // Simple list of nGlyphs elements
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# for (var iGid = 0; iGid < nGlyphs; iGid++) {
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# fdIndex = parser.parseCard8();
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# if (fdIndex >= fdArrayCount) {
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# throw new Error('CFF table CID Font FDSelect has bad FD index value ' + fdIndex + ' (FD count ' + fdArrayCount + ')');
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# }
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# fdSelect.push(fdIndex);
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# }
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if format == 3:
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# Ranges
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var nRanges = buf.readUint16(at).swap().int
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at += 2
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var first = buf.readUint16(at).swap().int
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at += 2
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print nRanges, first
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if first != 0:
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failUnsupported("CFF Table CID Font FDSelect format 3 range has bad initial GID")
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var next = 0
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for iRange in 0 ..< nRanges:
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var fdIndex = buf.readUint8(at).int
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inc at
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next = buf.readUint16(at).swap().int
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at += 2
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if fdIndex >= fdArrayCount:
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failUnsupported("CFF table CID Font FDSelect has bad FD index value")
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if next > nGlyphs:
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failUnsupported("CFF Table CID Font FDSelect format 3 range has bad GID")
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while first < next:
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result.add(fdIndex)
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inc first
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first = next
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if next != nGlyphs:
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failUnsupported("CFF Table CID Font FDSelect format 3 range has bad final GID")
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else:
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failUnsupported("CFF Table CID Font FDSelect format")
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result.topDict.fdSelectSeq = parseCFFFDSelect(buf, fdSelectOffset, maxp.numGlyphs.int, result.topDict.fdArraySeq.len)
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print result.topDict.fdSelectSeq.len
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print result.topDict.subrs
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if result.topDict.subrs != 0:
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var subrOffset =
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offset + result.topDict.private[1].int + result.topDict.subrs
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result.subrIndex = buf.parseCFFIndex(subrOffset)
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result.topDict.subrIndex = buf.parseCFFIndex(subrOffset)
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result.topDict.subrsBias = calcCFFSubroutineBias(result.topDict.subrIndex)
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proc parseCFFIndexLowMemory(buf: string, offset: int): seq[int] =
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proc getOffset(dataView: string, offset, offSize: int): int =
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@ -1482,11 +1613,11 @@ proc parseCFFTable(buf: string, offset: int): CFFTable =
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break
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sid += 1
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else:
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failUnsupported("CFF charset format")
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failUnsupported("CFF charset format: " & $format)
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# Why do we need this anyways?
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var charset = parseCFFCharset(
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buf, offset + result.topDict.charset, nGlyphs, result.stringIndex.objects)
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#var charset = parseCFFCharset(
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# buf, offset + result.topDict.charset, nGlyphs, result.stringIndex.objects)
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var start = offset + result.topDict.charStrings
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result.charIndex = buf.parseCFFIndex(start)
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@ -2251,11 +2382,12 @@ proc parseGlyfGlyph(opentype: OpenType, glyphId: uint16): Path =
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else:
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parseGlyphPath(opentype.buf, i, numberOfContours)
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import print
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proc parseCffGlyph(opentype: OpenType, glyphId: uint16): Path =
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let cff = opentype.cff
|
||||
let charstring = cff.charIndex.objects[glyphId]
|
||||
return cff.parseCFFCharstring(charstring)
|
||||
let charstring = cff.charIndex[glyphId]
|
||||
print glyphId
|
||||
return cff.parseCFFCharstring(charstring, glyphId.int)
|
||||
|
||||
proc parseGlyph(opentype: OpenType, rune: Rune): Path {.inline.} =
|
||||
if opentype.glyf != nil:
|
||||
|
|
@ -2371,7 +2503,7 @@ proc parseOpenType*(buf: string): OpenType {.raises: [PixieError].} =
|
|||
result.glyf =
|
||||
parseGlyfTable(buf, result.tableRecords["glyf"].offset.int, result.loca)
|
||||
elif "CFF " in result.tableRecords:
|
||||
result.cff = parseCFFTable(buf, result.tableRecords["CFF "].offset.int)
|
||||
result.cff = parseCFFTable(buf, result.tableRecords["CFF "].offset.int, result.maxp)
|
||||
|
||||
else:
|
||||
failUnsupported("glyph outlines")
|
||||
|
|
|
|||
Loading…
Reference in a new issue