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gerrit-public.fairphone.software / platform / external / fonttools / 7842e56b97ce677b83bdab09cda48bc2d89ac75a / . / Lib / fontTools / ttLib / tables / ttProgram.py
blob: 8dd9faa6bf87144c510152d21d9a15e2390adef3 [file] [log] [blame]
Just7842e561999-12-16 21:34:53 +0000[diff] [blame^]1"""ttLib.tables.ttProgram.py -- Assembler/disassembler for TrueType bytecode programs."""
2
3import array
4
5
6# first, the list of instructions that eat bytes or words from the instruction stream
7
8streamInstructions = [
9# ------ ----------- ----- ------------------------ --- ------ ---------------------------------- --------------
10# opcode mnemonic argbits descriptive name pops pushes eats from instruction stream pushes
11# ------ ----------- ----- ------------------------ --- ------ ---------------------------------- --------------
12 (0x40, 'NPUSHB', 0, 'PushNBytes', 0, -1), # n, b1, b2,...bn b1,b2...bn
13 (0x41, 'NPUSHW', 0, 'PushNWords', 0, -1), # n, w1, w2,...w w1,w2...wn
14 (0xb0, 'PUSHB', 3, 'PushBytes', 0, -1), # b0, b1,..bn b0, b1, ...,bn
15 (0xb8, 'PUSHW', 3, 'PushWords', 0, -1), # w0,w1,..wn w0 ,w1, ...wn
16# ------ ----------- ----- ------------------------ --- ------ ---------------------------------- --------------
17]
18
19
20# next, the list of "normal" instructions
21
22instructions = [
23# ------ ----------- ----- ------------------------ --- ------ ---------------------------------- --------------
24# opcode mnemonic argbits descriptive name pops pushes pops pushes
25# ------ ----------- ----- ------------------------ --- ------ ---------------------------------- --------------
26 (0x7f, 'AA', 0, 'AdjustAngle', 1, 0), # p -
27 (0x64, 'ABS', 0, 'Absolute', 1, 1), # n |n|
28 (0x60, 'ADD', 0, 'Add', 2, 1), # n2, n1 (n1 + n2)
29 (0x27, 'ALIGNPTS', 0, 'AlignPts', 2, 0), # p2, p1 -
30 (0x3c, 'ALIGNRP', 0, 'AlignRelativePt', -1, 0), # p1, p2, ... , ploopvalue -
31 (0x5a, 'AND', 0, 'LogicalAnd', 2, 1), # e2, e1 b
32 (0x2b, 'CALL', 0, 'CallFunction', 1, 0), # f -
33 (0x67, 'CEILING', 0, 'Ceiling', 1, 1), # n ceil(n)
34 (0x25, 'CINDEX', 0, 'CopyXToTopStack', 1, 1), # k ek
35 (0x22, 'CLEAR', 0, 'ClearStack', -1, 0), # all items on the stack -
36 (0x4f, 'DEBUG', 0, 'DebugCall', 1, 0), # n -
37 (0x73, 'DELTAC1', 0, 'DeltaExceptionC1', -1, 0), # argn, cn, argn-1,cn-1, , arg1, c1 -
38 (0x74, 'DELTAC2', 0, 'DeltaExceptionC2', -1, 0), # argn, cn, argn-1,cn-1, , arg1, c1 -
39 (0x75, 'DELTAC3', 0, 'DeltaExceptionC3', -1, 0), # argn, cn, argn-1,cn-1, , arg1, c1 -
40 (0x5d, 'DELTAP1', 0, 'DeltaExceptionP1', -1, 0), # argn, pn, argn-1, pn-1, , arg1, p1 -
41 (0x71, 'DELTAP2', 0, 'DeltaExceptionP2', -1, 0), # argn, pn, argn-1, pn-1, , arg1, p1 -
42 (0x72, 'DELTAP3', 0, 'DeltaExceptionP3', -1, 0), # argn, pn, argn-1, pn-1, , arg1, p1 -
43 (0x24, 'DEPTH', 0, 'GetDepthStack', 0, 1), # - n
44 (0x62, 'DIV', 0, 'Divide', 2, 1), # n2, n1 (n1 * 64)/ n2
45 (0x20, 'DUP', 0, 'DuplicateTopStack', 1, 2), # e e, e
46 (0x59, 'EIF', 0, 'EndIf', 0, 0), # - -
47 (0x1b, 'ELSE', 0, 'Else', 0, 0), # - -
48 (0x2d, 'ENDF', 0, 'EndFunctionDefinition', 0, 0), # - -
49 (0x54, 'EQ', 0, 'Equal', 2, 1), # e2, e1 b
50 (0x57, 'EVEN', 0, 'Even', 1, 1), # e b
51 (0x2c, 'FDEF', 0, 'FunctionDefinition', 1, 0), # f -
52 (0x4e, 'FLIPOFF', 0, 'SetAutoFlipOff', 0, 0), # - -
53 (0x4d, 'FLIPON', 0, 'SetAutoFlipOn', 0, 0), # - -
54 (0x80, 'FLIPPT', 0, 'FlipPoint', -1, 0), # p1, p2, ..., ploopvalue -
55 (0x82, 'FLIPRGOFF', 0, 'FlipRangeOff', 2, 0), # h, l -
56 (0x81, 'FLIPRGON', 0, 'FlipRangeOn', 2, 0), # h, l -
57 (0x66, 'FLOOR', 0, 'Floor', 1, 1), # n floor(n)
58 (0x46, 'GC', 1, 'GetCoordOnPVector', 1, 1), # p c
59 (0x88, 'GETINFO', 0, 'GetInfo', 1, 1), # selector result
60 (0x0d, 'GFV', 0, 'GetFVector', 0, 2), # - px, py
61 (0x0c, 'GPV', 0, 'GetPVector', 0, 2), # - px, py
62 (0x52, 'GT', 0, 'GreaterThan', 2, 1), # e2, e1 b
63 (0x53, 'GTEQ', 0, 'GreaterThanOrEqual', 2, 1), # e2, e1 b
64 (0x89, 'IDEF', 0, 'InstructionDefinition', 1, 0), # f -
65 (0x58, 'IF', 0, 'If', 1, 0), # e -
66 (0x8e, 'INSTCTRL', 0, 'SetInstrExecControl', 2, 0), # s, v -
67 (0x39, 'IP', 0, 'InterpolatePts', -1, 0), # p1, p2, ... , ploopvalue -
68 (0x0f, 'ISECT', 0, 'MovePtToIntersect', 5, 0), # a1, a0, b1, b0, p -
69 (0x30, 'IUP', 1, 'InterpolateUntPts', 0, 0), # - -
70 (0x1c, 'JMPR', 0, 'Jump', 1, 0), # offset -
71 (0x79, 'JROF', 0, 'JumpRelativeOnFalse', 2, 0), # e, offset -
72 (0x78, 'JROT', 0, 'JumpRelativeOnTrue', 2, 0), # e, offset -
73 (0x2a, 'LOOPCALL', 0, 'LoopAndCallFunction', 2, 0), # f, count -
74 (0x50, 'LT', 0, 'LessThan', 2, 1), # e2, e1 b
75 (0x51, 'LTEQ', 0, 'LessThenOrEqual', 2, 1), # e2, e1 b
76 (0x8b, 'MAX', 0, 'Maximum', 2, 1), # e2, e1 max(e1, e2)
77 (0x49, 'MD', 1, 'MeasureDistance', 2, 1), # p2,p1 d
78 (0x2e, 'MDAP', 1, 'MoveDirectAbsPt', 1, 0), # p -
79 (0xc0, 'MDRP', 5, 'MoveDirectRelPt', 1, 0), # p -
80 (0x3e, 'MIAP', 1, 'MoveIndirectAbsPt', 2, 0), # n, p -
81 (0x8c, 'MIN', 0, 'Minimum', 2, 1), # e2, e1 min(e1, e2)
82 (0x26, 'MINDEX', 0, 'MoveXToTopStack', 2, 1), # k ek
83 (0xe0, 'MIRP', 5, 'MoveIndirectRelPt', 1, 0), # n, p -
84 (0x4b, 'MPPEM', 0, 'MeasurePixelPerEm', 0, 1), # - ppem
85 (0x4c, 'MPS', 0, 'MeasurePointSize', 0, 1), # - pointSize
86 (0x3a, 'MSIRP', 1, 'MoveStackIndirRelPt', 2, 0), # d, p -
87 (0x63, 'MUL', 0, 'Multiply', 2, 1), # n2, n1 (n1 * n2)/64
88 (0x65, 'NEG', 0, 'Negate', 1, 1), # n -n
89 (0x55, 'NEQ', 0, 'NotEqual', 2, 1), # e2, e1 b
90 (0x5c, 'NOT', 0, 'LogicalNot', 1, 1), # e ( not e )
91 (0x6c, 'NROUND', 2, 'NoRound', 1, 1), # n1 n2
92 (0x56, 'ODD', 0, 'Odd', 1, 1), # e b
93 (0x5b, 'OR', 0, 'LogicalOr', 2, 1), # e2, e1 b
94 (0x21, 'POP', 0, 'PopTopStack', 1, 0), # e -
95 (0x45, 'RCVT', 0, 'ReadCVT', 1, 1), # location value
96 (0x7d, 'RDTG', 0, 'RoundDownToGrid', 0, 0), # - -
97 (0x7a, 'ROFF', 0, 'RoundOff', 0, 0), # - -
98 (0x8a, 'ROLL', 0, 'RollTopThreeStack', 3, 3), # a,b,c b,a,c
99 (0x68, 'ROUND', 2, 'Round', 1, 1), # n1 n2
100 (0x43, 'RS', 0, 'ReadStore', 1, 1), # n v
101 (0x3d, 'RTDG', 0, 'RoundToDoubleGrid', 0, 0), # - -
102 (0x18, 'RTG', 0, 'RoundToGrid', 0, 0), # - -
103 (0x19, 'RTHG', 0, 'RoundToHalfGrid', 0, 0), # - -
104 (0x7c, 'RUTG', 0, 'RoundUpToGrid', 0, 0), # - -
105 (0x77, 'S45ROUND', 0, 'SuperRound45Degrees', 1, 0), # n -
106 (0x7e, 'SANGW', 0, 'SetAngleWeight', 1, 0), # weight -
107 (0x85, 'SCANCTRL', 0, 'ScanConversionControl', 1, 0), # n -
108 (0x8d, 'SCANTYPE', 0, 'ScanType', 1, 0), # n -
109 (0x48, 'SCFS', 0, 'SetCoordFromStackFP', 2, 0), # c, p -
110 (0x1d, 'SCVTCI', 0, 'SetCVTCutIn', 1, 0), # n -
111 (0x5e, 'SDB', 0, 'SetDeltaBaseInGState', 1, 0), # n -
112 (0x86, 'SDPVTL', 1, 'SetDualPVectorToLine', 2, 0), # p2, p1 -
113 (0x5f, 'SDS', 0, 'SetDeltaShiftInGState', 1, 0), # n -
114 (0x0b, 'SFVFS', 0, 'SetFVectorFromStack', 2, 0), # y, x -
115 (0x04, 'SFVTCA', 1, 'SetFVectorToAxis', 0, 0), # - -
116 (0x08, 'SFVTL', 1, 'SetFVectorToLine', 2, 0), # p2, p1 -
117 (0x0e, 'SFVTPV', 0, 'SetFVectorToPVector', 0, 0), # - -
118 (0x34, 'SHC', 1, 'ShiftContourByLastPt', 1, 0), # c -
119 (0x32, 'SHP', 1, 'ShiftPointByLastPoint', -1, 0), # p1, p2, ..., ploopvalue -
120 (0x38, 'SHPIX', 0, 'ShiftZoneByPixel', -1, 0), # d, p1, p2, ..., ploopvalue -
121 (0x36, 'SHZ', 1, 'ShiftZoneByLastPoint', 1, 0), # e -
122 (0x17, 'SLOOP', 0, 'SetLoopVariable', 1, 0), # n -
123 (0x1a, 'SMD', 0, 'SetMinimumDistance', 1, 0), # distance -
124 (0x0a, 'SPVFS', 0, 'SetPVectorFromStack', 2, 0), # y, x -
125 (0x02, 'SPVTCA', 1, 'SetPVectorToAxis', 0, 0), # - -
126 (0x06, 'SPVTL', 1, 'SetPVectorToLine', 2, 0), # p2, p1 -
127 (0x76, 'SROUND', 0, 'SuperRound', 1, 0), # n -
128 (0x10, 'SRP0', 0, 'SetRefPoint0', 1, 0), # p -
129 (0x11, 'SRP1', 0, 'SetRefPoint1', 1, 0), # p -
130 (0x12, 'SRP2', 0, 'SetRefPoint2', 1, 0), # p -
131 (0x1f, 'SSW', 0, 'SetSingleWidth', 1, 0), # n -
132 (0x1e, 'SSWCI', 0, 'SetSingleWidthCutIn', 1, 0), # n -
133 (0x61, 'SUB', 0, 'Subtract', 2, 1), # n2, n1 (n1 - n2)
134 (0x00, 'SVTCA', 1, 'SetFPVectorToAxis', 0, 0), # - -
135 (0x23, 'SWAP', 0, 'SwapTopStack', 2, 2), # e2, e1 e1, e2
136 (0x13, 'SZP0', 0, 'SetZonePointer0', 1, 0), # n -
137 (0x14, 'SZP1', 0, 'SetZonePointer1', 1, 0), # n -
138 (0x15, 'SZP2', 0, 'SetZonePointer2', 1, 0), # n -
139 (0x16, 'SZPS', 0, 'SetZonePointerS', 1, 0), # n -
140 (0x29, 'UTP', 0, 'UnTouchPt', 1, 0), # p -
141 (0x70, 'WCVTF', 0, 'WriteCVTInFUnits', 2, 0), # n, l -
142 (0x44, 'WCVTP', 0, 'WriteCVTInPixels', 2, 0), # v, l -
143 (0x42, 'WS', 0, 'WriteStore', 2, 0), # v, l -
144# ------ ----------- ----- ------------------------ --- ------ ---------------------------------- --------------
145]
146
147
148def bitRepr(value, bits):
149 s = ""
150 for i in range(bits):
151 s = "01"[value & 0x1] + s
152 value = value >> 1
153 return s
154
155def makeOpcodeDict(instructionList):
156 opcodeDict = {}
157 for op, mnemonic, argbits, name, pops, pushes in instructionList:
158 if argbits:
159 argoffset = op
160 for i in range(1 << argbits):
161 opcodeDict[op+i] = mnemonic, argbits, argoffset, name
162 else:
163 opcodeDict[op] = mnemonic, 0, 0, name
164 return opcodeDict
165
166streamOpcodeDict = makeOpcodeDict(streamInstructions)
167opcodeDict = makeOpcodeDict(instructions)
168
169tt_instructions_error = "TT instructions error"
170
171
172class Program:
173
174 def __init__(self):
175 pass
176
177 def fromBytecode(self, bytecode):
178 self.bytecode = array.array("B")
179 self.bytecode.fromstring(bytecode)
180
181 def fromAssembly(self, assembly):
182 self.assembly = assembly
183
184 def getBytecode(self):
185 if not hasattr(self, "bytecode"):
186 self._assemble()
187 return self.bytecode.tostring()
188
189 def getAssembly(self):
190 if not hasattr(self, "assembly"):
191 self._disassemble()
192 return self.assembly
193
194 def _assemble(self):
195 xxx
196
197 def _disassemble(self):
198 assembly = []
199 i = 0
200 bytecode = self.bytecode
201 numBytecode = len(bytecode)
202 while i < numBytecode:
203 op = bytecode[i]
204 arg = 0
205 try:
206 mnemonic, argbits, argoffset, name = opcodeDict[op]
207 except KeyError:
208 try:
209 mnemonic, argbits, argoffset, name = streamOpcodeDict[op]
210 except KeyError:
211 raise tt_instructions_error, "illegal opcode: 0x%.2x" % op
212 pushbytes = pushwords = 0
213 if argbits:
214 if mnemonic == "PUSHB":
215 pushbytes = op - argoffset + 1
216 else:
217 pushwords = op - argoffset + 1
218 else:
219 i = i + 1
220 if mnemonic == "NPUSHB":
221 pushbytes = bytecode[i]
222 else:
223 pushwords = bytecode[i]
224 i = i + 1
225 assembly.append(mnemonic + "[ ]")
226 for j in range(pushbytes):
227 assembly.append(`bytecode[i]`)
228 i = i + 1
229 for j in range(0, pushwords, 2):
230 assembly.append(`(bytecode[i] << 8) + bytecode[i+1]`)
231 i = i + 2
232 else:
233 if argbits:
234 assembly.append(mnemonic + "[%s]" % bitRepr(op - argoffset, argbits))
235 else:
236 assembly.append(mnemonic + "[ ]")
237 i = i + 1
238 self.assembly = assembly
239 del self.bytecode
240
241
242fpgm = '@\01476&%\037\023\022\015\014\005\004\002, \260\003%E#E#ah\212 Eh \212#D`D-,KRXED\033!!Y-, EhD \260\001` E\260Fvh\030\212E`D-,\260\022+\260\002%E\260\002%Ej\260@\213`\260\002%#D!!!-,\260\023+\260\002%E\260\002%Ej\270\377\300\214`\260\002%#D!!!-,\261\000\003%EhTX\260\003%E\260\003%E`h \260\004%#D\260\004%#D\033\260\003% Eh \212#D\260\003%Eh`\260\003%#DY-,\260\003% Eh \212#D\260\003%Eh`\260\003%#D-,KRXED\033!!Y-,F#F`\212\212F# F\212`\212a\270\377\200b# \020#\212\261KK\212pE` \260\000PX\260\001a\270\377\272\213\033\260F\214Y\260\020`h\001:-, E\260\003%FRX?\033!\021Y-,KS#KQZX E\212`D\033!!Y-,KS#KQZX8\033!!Y-'
243gpgm = '@\022\011\003\207@\005\200\004\207\000\010\007\202\001\010\004\202\000\010\000\020\320\355\020\336\355\001\020\336\375\032}\336\032\030\375\31610'
244
245p = Program()
246p.fromBytecode(fpgm)
247for line in p.getAssembly():
248 print line
249