Merge pull request #421 from treeform/dev

Add TTC Font format.

pixie.nimble

@@ -9,10 +9,11 @@ requires "nim >= 1.4.8"
 requires "vmath >= 1.1.4"
 requires "chroma >= 0.2.5"
 requires "zippy >= 0.9.7"
-requires "flatty >= 0.2.4"
+requires "flatty >= 0.3.0"
 requires "nimsimd >= 1.0.0"
 requires "bumpy >= 1.1.0"
 
+
 task bindings, "Generate bindings":
 
   proc compile(libName: string, flags = "") =

src/pixie/fontformats/opentype.nim

@@ -1,5 +1,5 @@
-import flatty/binny, math, pixie/common, pixie/paths, sets, strutils, tables,
-    unicode, vmath
+import flatty/binny, flatty/encode, math, pixie/common, pixie/paths, sets,
+  strutils, tables, unicode, vmath
 
 ## See https://docs.microsoft.com/en-us/typography/opentype/spec/
 
@@ -86,6 +86,7 @@ type
     nameID*: uint16
     length*: uint16
     offset*: uint16
+    text*: string
 
   NameTable* = ref object
     format*: uint16
@@ -655,6 +656,17 @@ proc parseNameTable(buf: string, offset: int): NameTable =
     record.nameID = buf.readUint16(i + 6).swap()
     record.length = buf.readUint16(i + 8).swap()
     record.offset = buf.readUint16(i + 10).swap()
+    record.text = buf[
+      (offset + result.stringOffset.int + record.offset.int) ..<
+      (offset + result.stringOffset.int + record.offset.int + record.length.int)
+    ]
+    if record.platformID == 3 and
+      record.encodingID == 1 and
+      record.languageID == 1033:
+        record.text = fromUTF16BE(record.text)
+
+    record.text = record.text
+    result.nameRecords.add(record)
     i += 12
 
 proc parseOS2Table(buf: string, offset: int): OS2Table =
@@ -923,10 +935,19 @@ const cffStandardStrings = [
 const TOP_DICT_META = {
   0: "version",
   1: "notice",
-  1200: "copyright",
   2: "fullName",
   3: "familyName",
   4: "weight",
+  5: "fontBBox",
+
+  13: "uniqueId",
+  14: "xuid",
+  15: "charset",
+  16: "encoding",
+  17: "charStrings",
+  18: "private",
+
+  1200: "copyright",
   1201: "isFixedPitch",
   1202: "italicAngle",
   1203: "underlinePosition",
@@ -934,14 +955,7 @@ const TOP_DICT_META = {
   1205: "paintType",
   1206: "charstringType",
   1207: "fontMatrix",
-  13: "uniqueId",
-  5: "fontBBox",
   1208: "strokeWidth",
-  14: "xuid",
-  15: "charset",
-  16: "encoding",
-  17: "charStrings",
-  18: "private",
   1230: "ros",
   1231: "cidFontVersion",
   1232: "cidFontRevision",
@@ -2467,11 +2481,19 @@ proc isCCW*(opentype: OpenType): bool {.inline.} =
   ## CFF - true - counterclockwise
   opentype.cff == nil
 
-proc parseOpenType*(buf: string): OpenType {.raises: [PixieError].} =
+proc fullName*(opentype: OpenType): string =
+  ## Returns full name of the font if available.
+  if opentype.cff != nil:
+    return opentype.cff.topDict.fullName
+  for record in opentype.name.nameRecords:
+    if record.nameID == 6 and record.languageID == 1033:
+      return record.text
+
+proc parseOpenType*(buf: string, startLoc = 0): OpenType {.raises: [PixieError].} =
   result = OpenType()
   result.buf = buf
 
-  var i: int
+  var i: int = startLoc
 
   buf.eofCheck(i + 12)
 
@@ -2527,5 +2549,32 @@ proc parseOpenType*(buf: string): OpenType {.raises: [PixieError].} =
   except KeyError as e:
     raise newException(PixieError, "Missing required font table: " & e.msg)
 
+proc parseOpenTypeCollection*(buf: string): seq[OpenType] {.raises: [PixieError].} =
+  ## Reads a true/open type collection and returns seq of OpenType files.
+  var i: int
+  buf.eofCheck(i + 12)
+
+  let tag = buf[0 ..< 4]
+  if tag != "ttcf":
+    failUnsupported("invalid ttc file")
+
+  let
+    majorVersion = buf.readUint16(i + 4).swap()
+    minorVersion = buf.readUint16(i + 6).swap()
+    numFonts = buf.readUint32(i + 8).swap()
+
+  if majorVersion notin {1, 2} and minorVersion != 0:
+    failUnsupported("ttc version")
+
+  var tableDirectoryOffsets: seq[uint32]
+  i += 12
+  for n in 0 ..< numFonts:
+    buf.eofCheck(i + 4)
+    tableDirectoryOffsets.add(buf.readUint32(i).swap())
+    i += 4
+
+  for dir in tableDirectoryOffsets:
+    result.add(parseOpenType(buf, dir.int))
+
 when defined(release):
   {.pop.}

src/pixie/fonts.nim

@@ -706,6 +706,21 @@ proc readTypeface*(filePath: string): Typeface {.raises: [PixieError].} =
 
   result.filePath = filePath
 
+proc readTypefaces*(filePath: string): seq[Typeface] {.raises: [PixieError].} =
+  ## Loads a OpenType Collection (.ttc).
+  try:
+    for opentype in parseOpenTypeCollection(readFile(filePath)):
+      let typeface = Typeface()
+      typeface.opentype = opentype
+      result.add(typeface)
+  except IOError as e:
+    raise newException(PixieError, e.msg, e)
+
+proc name*(typeface: Typeface): string =
+  ## Returns the name of the font.
+  if typeface.opentype != nil:
+    return typeface.opentype.fullName
+
 proc readFont*(filePath: string): Font {.raises: [PixieError].} =
   ## Loads a font from a file.
   newFont(readTypeface(filePath))

tests/test_fonts.nim

@@ -1,4 +1,4 @@
-import pixie, pixie/fileformats/png, strformat, unicode
+import pixie, pixie/fileformats/png, strformat, unicode, os
 
 proc wh(image: Image): Vec2 =
   ## Return with and height as a size vector.
@@ -1196,3 +1196,54 @@ block:
   )
 
   doDiff(image, "customlineheight")
+
+block:
+  var font = readTypefaces("tests/fonts/PTSans.ttc")[0].newFont
+  font.size = 72
+  let image = newImage(200, 100)
+  image.fill(rgba(255, 255, 255, 255))
+  image.fillText(font, "AbCd")
+
+block:
+  var typefaces = readTypefaces("tests/fonts/PTSans.ttc")
+  for i, typeface in typefaces:
+    echo i, ": ", typeface.name
+
+when defined(windows):
+  block:
+    let files = @[
+      "/Windows/Fonts/batang.ttc",
+      "/Windows/Fonts/BIZ-UDGothicB.ttc",
+      "/Windows/Fonts/BIZ-UDGothicR.ttc",
+      "/Windows/Fonts/BIZ-UDMinchoM.ttc",
+      "/Windows/Fonts/cambria.ttc",
+      "/Windows/Fonts/gulim.ttc",
+      "/Windows/Fonts/meiryo.ttc",
+      "/Windows/Fonts/meiryob.ttc",
+      "/Windows/Fonts/mingliub.ttc",
+      "/Windows/Fonts/msgothic.ttc",
+      "/Windows/Fonts/msjh.ttc",
+      "/Windows/Fonts/msjhbd.ttc",
+      "/Windows/Fonts/msjhl.ttc",
+      "/Windows/Fonts/msmincho.ttc",
+      "/Windows/Fonts/msyh.ttc",
+      "/Windows/Fonts/msyhbd.ttc",
+      "/Windows/Fonts/msyhl.ttc",
+      "/Windows/Fonts/simsun.ttc",
+      "/Windows/Fonts/Sitka.ttc",
+      "/Windows/Fonts/SitkaB.ttc",
+      "/Windows/Fonts/SitkaI.ttc",
+      "/Windows/Fonts/SitkaZ.ttc",
+      "/Windows/Fonts/UDDigiKyokashoN-B.ttc",
+      "/Windows/Fonts/UDDigiKyokashoN-R.ttc",
+      "/Windows/Fonts/YuGothB.ttc",
+      "/Windows/Fonts/YuGothL.ttc",
+      "/Windows/Fonts/YuGothM.ttc",
+      "/Windows/Fonts/YuGothR.ttc",
+    ]
+    for file in files:
+      if fileExists(file):
+        echo file
+        var typefaces = readTypefaces(file)
+        for i, typeface in typefaces:
+          echo i, ": ", typeface.name