294 lines
8.3 KiB
Go
294 lines
8.3 KiB
Go
// Copyright 2012 The Freetype-Go Authors. All rights reserved.
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// Use of this source code is governed by your choice of either the
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// FreeType License or the GNU General Public License version 2 (or
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// any later version), both of which can be found in the LICENSE file.
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package truetype
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// The Truetype opcodes are summarized at https://developer.apple.com/fonts/TTRefMan/RM07/appendixA.html
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// TODO: the opXXX constants without end-of-line comments are not yet implemented.
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const (
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opSVTCA0 = 0x00 // Set freedom and projection Vectors To Coordinate Axis
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opSVTCA1 = 0x01 // .
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opSPVTCA0 = 0x02 // Set Projection Vector To Coordinate Axis
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opSPVTCA1 = 0x03 // .
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opSFVTCA0 = 0x04 // Set Freedom Vector to Coordinate Axis
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opSFVTCA1 = 0x05 // .
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opSPVTL0 = 0x06
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opSPVTL1 = 0x07
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opSFVTL0 = 0x08
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opSFVTL1 = 0x09
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opSPVFS = 0x0a // Set Projection Vector From Stack
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opSFVFS = 0x0b // Set Freedom Vector From Stack
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opGPV = 0x0c // Get Projection Vector
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opGFV = 0x0d // Get Freedom Vector
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opSFVTPV = 0x0e // Set Freedom Vector To Projection Vector
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opISECT = 0x0f
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opSRP0 = 0x10
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opSRP1 = 0x11
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opSRP2 = 0x12
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opSZP0 = 0x13
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opSZP1 = 0x14
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opSZP2 = 0x15
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opSZPS = 0x16
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opSLOOP = 0x17 // Set LOOP variable
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opRTG = 0x18 // Round To Grid
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opRTHG = 0x19 // Round To Half Grid
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opSMD = 0x1a // Set Minimum Distance
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opELSE = 0x1b // ELSE clause
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opJMPR = 0x1c // JuMP Relative
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opSCVTCI = 0x1d
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opSSWCI = 0x1e
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opSSW = 0x1f
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opDUP = 0x20 // DUPlicate top stack element
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opPOP = 0x21 // POP top stack element
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opCLEAR = 0x22 // CLEAR the stack
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opSWAP = 0x23 // SWAP the top two elements on the stack
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opDEPTH = 0x24 // DEPTH of the stack
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opCINDEX = 0x25 // Copy the INDEXed element to the top of the stack
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opMINDEX = 0x26 // Move the INDEXed element to the top of the stack
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opALIGNPTS = 0x27
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op_0x28 = 0x28
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opUTP = 0x29
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opLOOPCALL = 0x2a // LOOP and CALL function
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opCALL = 0x2b // CALL function
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opFDEF = 0x2c // Function DEFinition
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opENDF = 0x2d // END Function definition
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opMDAP0 = 0x2e
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opMDAP1 = 0x2f
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opIUP0 = 0x30
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opIUP1 = 0x31
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opSHP0 = 0x32
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opSHP1 = 0x33
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opSHC0 = 0x34
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opSHC1 = 0x35
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opSHZ0 = 0x36
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opSHZ1 = 0x37
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opSHPIX = 0x38
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opIP = 0x39
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opMSIRP0 = 0x3a
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opMSIRP1 = 0x3b
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opALIGNRP = 0x3c
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opRTDG = 0x3d // Round To Double Grid
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opMIAP0 = 0x3e
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opMIAP1 = 0x3f
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opNPUSHB = 0x40 // PUSH N Bytes
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opNPUSHW = 0x41 // PUSH N Words
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opWS = 0x42 // Write Store
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opRS = 0x43 // Read Store
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opWCVTP = 0x44
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opRCVT = 0x45
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opGC0 = 0x46
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opGC1 = 0x47
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opSCFS = 0x48
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opMD0 = 0x49
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opMD1 = 0x4a
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opMPPEM = 0x4b
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opMPS = 0x4c
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opFLIPON = 0x4d
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opFLIPOFF = 0x4e
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opDEBUG = 0x4f // DEBUG call
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opLT = 0x50 // Less Than
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opLTEQ = 0x51 // Less Than or EQual
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opGT = 0x52 // Greater Than
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opGTEQ = 0x53 // Greater Than or EQual
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opEQ = 0x54 // EQual
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opNEQ = 0x55 // Not EQual
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opODD = 0x56 // ODD
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opEVEN = 0x57 // EVEN
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opIF = 0x58 // IF test
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opEIF = 0x59 // End IF
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opAND = 0x5a // logical AND
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opOR = 0x5b // logical OR
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opNOT = 0x5c // logical NOT
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opDELTAP1 = 0x5d
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opSDB = 0x5e
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opSDS = 0x5f
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opADD = 0x60 // ADD
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opSUB = 0x61 // SUBtract
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opDIV = 0x62 // DIVide
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opMUL = 0x63 // MULtiply
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opABS = 0x64 // ABSolute value
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opNEG = 0x65 // NEGate
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opFLOOR = 0x66 // FLOOR
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opCEILING = 0x67 // CEILING
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opROUND00 = 0x68 // ROUND value
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opROUND01 = 0x69 // .
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opROUND10 = 0x6a // .
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opROUND11 = 0x6b // .
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opNROUND00 = 0x6c // No ROUNDing of value
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opNROUND01 = 0x6d // .
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opNROUND10 = 0x6e // .
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opNROUND11 = 0x6f // .
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opWCVTF = 0x70
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opDELTAP2 = 0x71
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opDELTAP3 = 0x72
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opDELTAC1 = 0x73
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opDELTAC2 = 0x74
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opDELTAC3 = 0x75
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opSROUND = 0x76 // Super ROUND
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opS45ROUND = 0x77 // Super ROUND 45 degrees
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opJROT = 0x78 // Jump Relative On True
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opJROF = 0x79 // Jump Relative On False
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opROFF = 0x7a // Round OFF
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op_0x7b = 0x7b
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opRUTG = 0x7c // Round Up To Grid
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opRDTG = 0x7d // Round Down To Grid
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opSANGW = 0x7e // Set ANGle Weight
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opAA = 0x7f // Adjust Angle
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opFLIPPT = 0x80
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opFLIPRGON = 0x81
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opFLIPRGOFF = 0x82
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op_0x83 = 0x83
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op_0x84 = 0x84
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opSCANCTRL = 0x85
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opSDPVTL0 = 0x86
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opSDPVTL1 = 0x87
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opGETINFO = 0x88
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opIDEF = 0x89 // Instruction DEFinition
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opROLL = 0x8a // ROLL the top three stack elements
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opMAX = 0x8b // MAXimum of top two stack elements
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opMIN = 0x8c // MINimum of top two stack elements
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opSCANTYPE = 0x8d
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opINSTCTRL = 0x8e
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op_0x8f = 0x8f
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op_0x90 = 0x90
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op_0x91 = 0x91
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op_0x92 = 0x92
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op_0x93 = 0x93
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op_0x94 = 0x94
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op_0x95 = 0x95
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op_0x96 = 0x96
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op_0x97 = 0x97
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op_0x98 = 0x98
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op_0x99 = 0x99
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op_0x9a = 0x9a
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op_0x9b = 0x9b
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op_0x9c = 0x9c
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op_0x9d = 0x9d
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op_0x9e = 0x9e
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op_0x9f = 0x9f
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op_0xa0 = 0xa0
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op_0xa1 = 0xa1
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op_0xa2 = 0xa2
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op_0xa3 = 0xa3
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op_0xa4 = 0xa4
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op_0xa5 = 0xa5
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op_0xa6 = 0xa6
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op_0xa7 = 0xa7
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op_0xa8 = 0xa8
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op_0xa9 = 0xa9
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op_0xaa = 0xaa
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op_0xab = 0xab
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op_0xac = 0xac
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op_0xad = 0xad
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op_0xae = 0xae
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op_0xaf = 0xaf
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opPUSHB000 = 0xb0 // PUSH Bytes
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opPUSHB001 = 0xb1 // .
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opPUSHB010 = 0xb2 // .
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opPUSHB011 = 0xb3 // .
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opPUSHB100 = 0xb4 // .
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opPUSHB101 = 0xb5 // .
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opPUSHB110 = 0xb6 // .
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opPUSHB111 = 0xb7 // .
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opPUSHW000 = 0xb8 // PUSH Words
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opPUSHW001 = 0xb9 // .
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opPUSHW010 = 0xba // .
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opPUSHW011 = 0xbb // .
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opPUSHW100 = 0xbc // .
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opPUSHW101 = 0xbd // .
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opPUSHW110 = 0xbe // .
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opPUSHW111 = 0xbf // .
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opMDRP00000 = 0xc0
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opMDRP00001 = 0xc1
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opMDRP00010 = 0xc2
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opMDRP00011 = 0xc3
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opMDRP00100 = 0xc4
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opMDRP00101 = 0xc5
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opMDRP00110 = 0xc6
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opMDRP00111 = 0xc7
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opMDRP01000 = 0xc8
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opMDRP01001 = 0xc9
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opMDRP01010 = 0xca
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opMDRP01011 = 0xcb
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opMDRP01100 = 0xcc
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opMDRP01101 = 0xcd
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opMDRP01110 = 0xce
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opMDRP01111 = 0xcf
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opMDRP10000 = 0xd0
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opMDRP10001 = 0xd1
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opMDRP10010 = 0xd2
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opMDRP10011 = 0xd3
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opMDRP10100 = 0xd4
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opMDRP10101 = 0xd5
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opMDRP10110 = 0xd6
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opMDRP10111 = 0xd7
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opMDRP11000 = 0xd8
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opMDRP11001 = 0xd9
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opMDRP11010 = 0xda
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opMDRP11011 = 0xdb
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opMDRP11100 = 0xdd
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opMDRP11101 = 0xdc
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opMDRP11110 = 0xde
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opMDRP11111 = 0xdf
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opMIRP00000 = 0xe0
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opMIRP00001 = 0xe1
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opMIRP00010 = 0xe2
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opMIRP00011 = 0xe3
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opMIRP00100 = 0xe4
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opMIRP00101 = 0xe5
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opMIRP00110 = 0xe6
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opMIRP00111 = 0xe7
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opMIRP01000 = 0xe8
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opMIRP01001 = 0xe9
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opMIRP01010 = 0xea
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opMIRP01011 = 0xeb
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opMIRP01100 = 0xec
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opMIRP01101 = 0xed
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opMIRP01110 = 0xee
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opMIRP01111 = 0xef
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opMIRP10000 = 0xf0
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opMIRP10001 = 0xf1
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opMIRP10010 = 0xf2
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opMIRP10011 = 0xf3
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opMIRP10100 = 0xf4
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opMIRP10101 = 0xf5
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opMIRP10110 = 0xf6
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opMIRP10111 = 0xf7
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opMIRP11000 = 0xf8
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opMIRP11001 = 0xf9
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opMIRP11010 = 0xfa
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opMIRP11011 = 0xfb
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opMIRP11100 = 0xfd
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opMIRP11101 = 0xfc
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opMIRP11110 = 0xfe
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opMIRP11111 = 0xff
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)
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// popCount is the number of stack elements that each opcode pops.
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var popCount = [256]uint8{
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// 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f
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0, 0, 0, 0, 0, 0, q, q, q, q, 2, 2, 0, 0, 0, q, // 0x00 - 0x0f
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q, q, q, q, q, q, q, 1, 0, 0, 1, 0, 1, q, q, q, // 0x10 - 0x1f
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1, 1, 0, 2, 0, 1, 1, q, q, q, 2, 1, 1, 0, q, q, // 0x20 - 0x2f
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q, q, q, q, q, q, q, q, q, q, q, q, q, 0, q, q, // 0x30 - 0x3f
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0, 0, 2, 1, q, q, q, q, q, q, q, q, q, q, q, 0, // 0x40 - 0x4f
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2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 2, 2, 1, q, q, q, // 0x50 - 0x5f
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2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x60 - 0x6f
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q, q, q, q, q, q, 1, 1, 2, 2, 0, q, 0, 0, 1, 1, // 0x70 - 0x7f
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q, q, q, q, q, q, q, q, q, 1, 3, 2, 2, q, q, q, // 0x80 - 0x8f
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q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0x90 - 0x9f
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q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0xa0 - 0xaf
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xb0 - 0xbf
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q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0xc0 - 0xcf
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q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0xd0 - 0xdf
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q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0xe0 - 0xef
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q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, q, // 0xf0 - 0xff
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}
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// popCount[opcode] == q means that that opcode is not yet implemented.
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const q = 255
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