340 lines
10 KiB
Python
340 lines
10 KiB
Python
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# Copyright 2013 Google, Inc. All Rights Reserved.
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#
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# Google Author(s): Behdad Esfahbod, Roozbeh Pournader
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from fontTools import ttLib, cffLib
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from fontTools.misc.psCharStrings import T2WidthExtractor
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from fontTools.ttLib.tables.DefaultTable import DefaultTable
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from fontTools.merge.base import add_method, mergeObjects
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from fontTools.merge.cmap import computeMegaCmap
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from fontTools.merge.util import *
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import logging
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log = logging.getLogger("fontTools.merge")
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ttLib.getTableClass("maxp").mergeMap = {
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"*": max,
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"tableTag": equal,
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"tableVersion": equal,
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"numGlyphs": sum,
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"maxStorage": first,
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"maxFunctionDefs": first,
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"maxInstructionDefs": first,
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# TODO When we correctly merge hinting data, update these values:
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# maxFunctionDefs, maxInstructionDefs, maxSizeOfInstructions
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}
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headFlagsMergeBitMap = {
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"size": 16,
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"*": bitwise_or,
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1: bitwise_and, # Baseline at y = 0
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2: bitwise_and, # lsb at x = 0
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3: bitwise_and, # Force ppem to integer values. FIXME?
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5: bitwise_and, # Font is vertical
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6: lambda bit: 0, # Always set to zero
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11: bitwise_and, # Font data is 'lossless'
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13: bitwise_and, # Optimized for ClearType
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14: bitwise_and, # Last resort font. FIXME? equal or first may be better
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15: lambda bit: 0, # Always set to zero
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}
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ttLib.getTableClass("head").mergeMap = {
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"tableTag": equal,
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"tableVersion": max,
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"fontRevision": max,
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"checkSumAdjustment": lambda lst: 0, # We need *something* here
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"magicNumber": equal,
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"flags": mergeBits(headFlagsMergeBitMap),
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"unitsPerEm": equal,
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"created": current_time,
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"modified": current_time,
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"xMin": min,
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"yMin": min,
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"xMax": max,
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"yMax": max,
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"macStyle": first,
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"lowestRecPPEM": max,
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"fontDirectionHint": lambda lst: 2,
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"indexToLocFormat": first,
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"glyphDataFormat": equal,
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}
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ttLib.getTableClass("hhea").mergeMap = {
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"*": equal,
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"tableTag": equal,
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"tableVersion": max,
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"ascent": max,
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"descent": min,
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"lineGap": max,
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"advanceWidthMax": max,
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"minLeftSideBearing": min,
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"minRightSideBearing": min,
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"xMaxExtent": max,
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"caretSlopeRise": first,
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"caretSlopeRun": first,
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"caretOffset": first,
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"numberOfHMetrics": recalculate,
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}
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ttLib.getTableClass("vhea").mergeMap = {
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"*": equal,
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"tableTag": equal,
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"tableVersion": max,
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"ascent": max,
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"descent": min,
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"lineGap": max,
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"advanceHeightMax": max,
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"minTopSideBearing": min,
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"minBottomSideBearing": min,
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"yMaxExtent": max,
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"caretSlopeRise": first,
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"caretSlopeRun": first,
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"caretOffset": first,
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"numberOfVMetrics": recalculate,
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}
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os2FsTypeMergeBitMap = {
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"size": 16,
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"*": lambda bit: 0,
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1: bitwise_or, # no embedding permitted
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2: bitwise_and, # allow previewing and printing documents
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3: bitwise_and, # allow editing documents
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8: bitwise_or, # no subsetting permitted
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9: bitwise_or, # no embedding of outlines permitted
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}
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def mergeOs2FsType(lst):
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lst = list(lst)
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if all(item == 0 for item in lst):
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return 0
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# Compute least restrictive logic for each fsType value
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for i in range(len(lst)):
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# unset bit 1 (no embedding permitted) if either bit 2 or 3 is set
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if lst[i] & 0x000C:
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lst[i] &= ~0x0002
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# set bit 2 (allow previewing) if bit 3 is set (allow editing)
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elif lst[i] & 0x0008:
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lst[i] |= 0x0004
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# set bits 2 and 3 if everything is allowed
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elif lst[i] == 0:
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lst[i] = 0x000C
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fsType = mergeBits(os2FsTypeMergeBitMap)(lst)
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# unset bits 2 and 3 if bit 1 is set (some font is "no embedding")
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if fsType & 0x0002:
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fsType &= ~0x000C
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return fsType
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ttLib.getTableClass("OS/2").mergeMap = {
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"*": first,
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"tableTag": equal,
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"version": max,
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"xAvgCharWidth": first, # Will be recalculated at the end on the merged font
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"fsType": mergeOs2FsType, # Will be overwritten
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"panose": first, # FIXME: should really be the first Latin font
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"ulUnicodeRange1": bitwise_or,
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"ulUnicodeRange2": bitwise_or,
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"ulUnicodeRange3": bitwise_or,
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"ulUnicodeRange4": bitwise_or,
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"fsFirstCharIndex": min,
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"fsLastCharIndex": max,
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"sTypoAscender": max,
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"sTypoDescender": min,
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"sTypoLineGap": max,
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"usWinAscent": max,
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"usWinDescent": max,
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# Version 1
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"ulCodePageRange1": onlyExisting(bitwise_or),
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"ulCodePageRange2": onlyExisting(bitwise_or),
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# Version 2, 3, 4
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"sxHeight": onlyExisting(max),
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"sCapHeight": onlyExisting(max),
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"usDefaultChar": onlyExisting(first),
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"usBreakChar": onlyExisting(first),
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"usMaxContext": onlyExisting(max),
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# version 5
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"usLowerOpticalPointSize": onlyExisting(min),
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"usUpperOpticalPointSize": onlyExisting(max),
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}
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@add_method(ttLib.getTableClass("OS/2"))
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def merge(self, m, tables):
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DefaultTable.merge(self, m, tables)
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if self.version < 2:
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# bits 8 and 9 are reserved and should be set to zero
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self.fsType &= ~0x0300
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if self.version >= 3:
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# Only one of bits 1, 2, and 3 may be set. We already take
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# care of bit 1 implications in mergeOs2FsType. So unset
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# bit 2 if bit 3 is already set.
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if self.fsType & 0x0008:
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self.fsType &= ~0x0004
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return self
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ttLib.getTableClass("post").mergeMap = {
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"*": first,
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"tableTag": equal,
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"formatType": max,
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"isFixedPitch": min,
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"minMemType42": max,
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"maxMemType42": lambda lst: 0,
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"minMemType1": max,
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"maxMemType1": lambda lst: 0,
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"mapping": onlyExisting(sumDicts),
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"extraNames": lambda lst: [],
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}
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ttLib.getTableClass("vmtx").mergeMap = ttLib.getTableClass("hmtx").mergeMap = {
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"tableTag": equal,
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"metrics": sumDicts,
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}
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ttLib.getTableClass("name").mergeMap = {
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"tableTag": equal,
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"names": first, # FIXME? Does mixing name records make sense?
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}
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ttLib.getTableClass("loca").mergeMap = {
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"*": recalculate,
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"tableTag": equal,
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}
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ttLib.getTableClass("glyf").mergeMap = {
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"tableTag": equal,
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"glyphs": sumDicts,
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"glyphOrder": sumLists,
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"_reverseGlyphOrder": recalculate,
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"axisTags": equal,
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}
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@add_method(ttLib.getTableClass("glyf"))
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def merge(self, m, tables):
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for i, table in enumerate(tables):
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for g in table.glyphs.values():
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if i:
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# Drop hints for all but first font, since
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# we don't map functions / CVT values.
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g.removeHinting()
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# Expand composite glyphs to load their
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# composite glyph names.
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if g.isComposite() or g.isVarComposite():
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g.expand(table)
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return DefaultTable.merge(self, m, tables)
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ttLib.getTableClass("prep").mergeMap = lambda self, lst: first(lst)
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ttLib.getTableClass("fpgm").mergeMap = lambda self, lst: first(lst)
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ttLib.getTableClass("cvt ").mergeMap = lambda self, lst: first(lst)
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ttLib.getTableClass("gasp").mergeMap = lambda self, lst: first(
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lst
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) # FIXME? Appears irreconcilable
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@add_method(ttLib.getTableClass("CFF "))
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def merge(self, m, tables):
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if any(hasattr(table.cff[0], "FDSelect") for table in tables):
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raise NotImplementedError("Merging CID-keyed CFF tables is not supported yet")
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for table in tables:
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table.cff.desubroutinize()
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newcff = tables[0]
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newfont = newcff.cff[0]
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private = newfont.Private
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newDefaultWidthX, newNominalWidthX = private.defaultWidthX, private.nominalWidthX
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storedNamesStrings = []
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glyphOrderStrings = []
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glyphOrder = set(newfont.getGlyphOrder())
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for name in newfont.strings.strings:
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if name not in glyphOrder:
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storedNamesStrings.append(name)
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else:
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glyphOrderStrings.append(name)
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chrset = list(newfont.charset)
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newcs = newfont.CharStrings
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log.debug("FONT 0 CharStrings: %d.", len(newcs))
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for i, table in enumerate(tables[1:], start=1):
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font = table.cff[0]
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defaultWidthX, nominalWidthX = (
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font.Private.defaultWidthX,
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font.Private.nominalWidthX,
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)
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widthsDiffer = (
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defaultWidthX != newDefaultWidthX or nominalWidthX != newNominalWidthX
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)
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font.Private = private
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fontGlyphOrder = set(font.getGlyphOrder())
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for name in font.strings.strings:
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if name in fontGlyphOrder:
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glyphOrderStrings.append(name)
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cs = font.CharStrings
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gs = table.cff.GlobalSubrs
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log.debug("Font %d CharStrings: %d.", i, len(cs))
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chrset.extend(font.charset)
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if newcs.charStringsAreIndexed:
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for i, name in enumerate(cs.charStrings, start=len(newcs)):
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newcs.charStrings[name] = i
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newcs.charStringsIndex.items.append(None)
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for name in cs.charStrings:
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if widthsDiffer:
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c = cs[name]
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defaultWidthXToken = object()
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extractor = T2WidthExtractor([], [], nominalWidthX, defaultWidthXToken)
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extractor.execute(c)
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width = extractor.width
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if width is not defaultWidthXToken:
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c.program.pop(0)
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else:
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width = defaultWidthX
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if width != newDefaultWidthX:
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c.program.insert(0, width - newNominalWidthX)
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newcs[name] = cs[name]
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newfont.charset = chrset
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newfont.numGlyphs = len(chrset)
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newfont.strings.strings = glyphOrderStrings + storedNamesStrings
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return newcff
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@add_method(ttLib.getTableClass("cmap"))
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def merge(self, m, tables):
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# TODO Handle format=14.
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if not hasattr(m, "cmap"):
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computeMegaCmap(m, tables)
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cmap = m.cmap
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cmapBmpOnly = {uni: gid for uni, gid in cmap.items() if uni <= 0xFFFF}
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self.tables = []
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module = ttLib.getTableModule("cmap")
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if len(cmapBmpOnly) != len(cmap):
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# format-12 required.
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cmapTable = module.cmap_classes[12](12)
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cmapTable.platformID = 3
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cmapTable.platEncID = 10
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cmapTable.language = 0
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cmapTable.cmap = cmap
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self.tables.append(cmapTable)
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# always create format-4
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cmapTable = module.cmap_classes[4](4)
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cmapTable.platformID = 3
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cmapTable.platEncID = 1
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cmapTable.language = 0
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cmapTable.cmap = cmapBmpOnly
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# ordered by platform then encoding
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self.tables.insert(0, cmapTable)
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self.tableVersion = 0
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self.numSubTables = len(self.tables)
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return self
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