147 lines
5.0 KiB
Python
147 lines
5.0 KiB
Python
from __future__ import print_function, division, absolute_import
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from fontTools.misc.py23 import *
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from fontTools.misc import sstruct
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from fontTools.misc.textTools import readHex
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from .sbixGlyph import *
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import struct
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sbixBitmapSetHeaderFormat = """
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>
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ppem: H # The PPEM for which this strike was designed (e.g., 9,
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# 12, 24)
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resolution: H # The screen resolution (in dpi) for which this strike
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# was designed (e.g., 72)
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"""
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sbixBitmapOffsetEntryFormat = """
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>
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ulOffset: L # 00 00 07 E0 # Offset from start of first offset entry to each bitmap
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"""
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sbixBitmapSetHeaderFormatSize = sstruct.calcsize(sbixBitmapSetHeaderFormat)
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sbixBitmapOffsetEntryFormatSize = sstruct.calcsize(sbixBitmapOffsetEntryFormat)
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class Strike(object):
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def __init__(self, rawdata=None, ppem=0, resolution=72):
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self.data = rawdata
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self.ppem = ppem
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self.resolution = resolution
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self.bitmaps = {}
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def decompile(self, ttFont):
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if self.data is None:
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from fontTools import ttLib
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raise ttLib.TTLibError
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if len(self.data) < sbixBitmapSetHeaderFormatSize:
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from fontTools import ttLib
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raise(ttLib.TTLibError, "Strike header too short: Expected %x, got %x.") \
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% (sbixBitmapSetHeaderFormatSize, len(self.data))
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# read Strike header from raw data
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sstruct.unpack(sbixBitmapSetHeaderFormat, self.data[:sbixBitmapSetHeaderFormatSize], self)
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# calculate number of bitmaps
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firstBitmapOffset, = struct.unpack(">L", \
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self.data[sbixBitmapSetHeaderFormatSize : sbixBitmapSetHeaderFormatSize + sbixBitmapOffsetEntryFormatSize])
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self.numBitmaps = (firstBitmapOffset - sbixBitmapSetHeaderFormatSize) // sbixBitmapOffsetEntryFormatSize - 1
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# ^ -1 because there's one more offset than bitmaps
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# build offset list for single bitmap offsets
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self.bitmapOffsets = []
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for i in range(self.numBitmaps + 1): # + 1 because there's one more offset than bitmaps
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start = i * sbixBitmapOffsetEntryFormatSize + sbixBitmapSetHeaderFormatSize
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myOffset, = struct.unpack(">L", self.data[start : start + sbixBitmapOffsetEntryFormatSize])
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self.bitmapOffsets.append(myOffset)
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# iterate through offset list and slice raw data into bitmaps
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for i in range(self.numBitmaps):
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myBitmap = Bitmap(rawdata=self.data[self.bitmapOffsets[i] : self.bitmapOffsets[i+1]], gid=i)
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myBitmap.decompile(ttFont)
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self.bitmaps[myBitmap.glyphName] = myBitmap
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del self.bitmapOffsets
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del self.data
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def compile(self, ttFont):
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self.bitmapOffsets = ""
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self.bitmapData = ""
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glyphOrder = ttFont.getGlyphOrder()
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# first bitmap starts right after the header
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bitmapOffset = sbixBitmapSetHeaderFormatSize + sbixBitmapOffsetEntryFormatSize * (len(glyphOrder) + 1)
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for glyphName in glyphOrder:
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if glyphName in self.bitmaps:
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# we have a bitmap for this glyph
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myBitmap = self.bitmaps[glyphName]
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else:
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# must add empty bitmap for this glyph
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myBitmap = Bitmap(glyphName=glyphName)
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myBitmap.compile(ttFont)
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myBitmap.ulOffset = bitmapOffset
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self.bitmapData += myBitmap.rawdata
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bitmapOffset += len(myBitmap.rawdata)
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self.bitmapOffsets += sstruct.pack(sbixBitmapOffsetEntryFormat, myBitmap)
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# add last "offset", really the end address of the last bitmap
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dummy = Bitmap()
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dummy.ulOffset = bitmapOffset
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self.bitmapOffsets += sstruct.pack(sbixBitmapOffsetEntryFormat, dummy)
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# pack header
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self.data = sstruct.pack(sbixBitmapSetHeaderFormat, self)
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# add offsets and image data after header
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self.data += self.bitmapOffsets + self.bitmapData
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def toXML(self, xmlWriter, ttFont):
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xmlWriter.begintag("strike")
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xmlWriter.newline()
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xmlWriter.simpletag("ppem", value=self.ppem)
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xmlWriter.newline()
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xmlWriter.simpletag("resolution", value=self.resolution)
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xmlWriter.newline()
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glyphOrder = ttFont.getGlyphOrder()
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for i in range(len(glyphOrder)):
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if glyphOrder[i] in self.bitmaps:
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self.bitmaps[glyphOrder[i]].toXML(xmlWriter, ttFont)
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# TODO: what if there are more bitmaps than glyphs?
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xmlWriter.endtag("strike")
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xmlWriter.newline()
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def fromXML(self, name, attrs, content, ttFont):
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if name in ["ppem", "resolution"]:
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setattr(self, name, int(attrs["value"]))
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elif name == "bitmap":
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if "format" in attrs:
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myFormat = attrs["format"]
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else:
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myFormat = None
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if "glyphname" in attrs:
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myGlyphName = attrs["glyphname"]
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else:
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from fontTools import ttLib
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raise ttLib.TTLibError("Bitmap must have a glyph name.")
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if "originOffsetX" in attrs:
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myOffsetX = int(attrs["originOffsetX"])
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else:
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myOffsetX = 0
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if "originOffsetY" in attrs:
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myOffsetY = int(attrs["originOffsetY"])
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else:
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myOffsetY = 0
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myBitmap = Bitmap(
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glyphName=myGlyphName,
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imageFormatTag=myFormat,
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originOffsetX=myOffsetX,
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originOffsetY=myOffsetY,
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)
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for element in content:
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if isinstance(element, tuple):
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name, attrs, content = element
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myBitmap.fromXML(name, attrs, content, ttFont)
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myBitmap.compile(ttFont)
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self.bitmaps[myBitmap.glyphName] = myBitmap
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else:
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from fontTools import ttLib
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raise ttLib.TTLibError("can't handle '%s' element" % name)
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