opcodes.go

// Copyright 2012 The Freetype-Go Authors. All rights reserved.
// Use of this source code is governed by your choice of either the
// FreeType License or the GNU General Public License version 2 (or
// any later version), both of which can be found in the LICENSE file.

package truetype

// The Truetype opcodes are summarized at
// https://developer.apple.com/fonts/TTRefMan/RM07/appendixA.html

const (
	opSVTCA0    = 0x00 // Set freedom and projection Vectors To Coordinate Axis
	opSVTCA1    = 0x01 // .
	opSPVTCA0   = 0x02 // Set Projection Vector To Coordinate Axis
	opSPVTCA1   = 0x03 // .
	opSFVTCA0   = 0x04 // Set Freedom Vector to Coordinate Axis
	opSFVTCA1   = 0x05 // .
	opSPVTL0    = 0x06 // Set Projection Vector To Line
	opSPVTL1    = 0x07 // .
	opSFVTL0    = 0x08 // Set Freedom Vector To Line
	opSFVTL1    = 0x09 // .
	opSPVFS     = 0x0a // Set Projection Vector From Stack
	opSFVFS     = 0x0b // Set Freedom Vector From Stack
	opGPV       = 0x0c // Get Projection Vector
	opGFV       = 0x0d // Get Freedom Vector
	opSFVTPV    = 0x0e // Set Freedom Vector To Projection Vector
	opISECT     = 0x0f // moves point p to the InterSECTion of two lines
	opSRP0      = 0x10 // Set Reference Point 0
	opSRP1      = 0x11 // Set Reference Point 1
	opSRP2      = 0x12 // Set Reference Point 2
	opSZP0      = 0x13 // Set Zone Pointer 0
	opSZP1      = 0x14 // Set Zone Pointer 1
	opSZP2      = 0x15 // Set Zone Pointer 2
	opSZPS      = 0x16 // Set Zone PointerS
	opSLOOP     = 0x17 // Set LOOP variable
	opRTG       = 0x18 // Round To Grid
	opRTHG      = 0x19 // Round To Half Grid
	opSMD       = 0x1a // Set Minimum Distance
	opELSE      = 0x1b // ELSE clause
	opJMPR      = 0x1c // JuMP Relative
	opSCVTCI    = 0x1d // Set Control Value Table Cut-In
	opSSWCI     = 0x1e // Set Single Width Cut-In
	opSSW       = 0x1f // Set Single Width
	opDUP       = 0x20 // DUPlicate top stack element
	opPOP       = 0x21 // POP top stack element
	opCLEAR     = 0x22 // CLEAR the stack
	opSWAP      = 0x23 // SWAP the top two elements on the stack
	opDEPTH     = 0x24 // DEPTH of the stack
	opCINDEX    = 0x25 // Copy the INDEXed element to the top of the stack
	opMINDEX    = 0x26 // Move the INDEXed element to the top of the stack
	opALIGNPTS  = 0x27 // ALIGN PoinTS
	op_0x28     = 0x28 // deprecated
	opUTP       = 0x29 // UnTouch Point
	opLOOPCALL  = 0x2a // LOOP and CALL function
	opCALL      = 0x2b // CALL function
	opFDEF      = 0x2c // Function DEFinition
	opENDF      = 0x2d // END Function definition
	opMDAP0     = 0x2e // Move Direct Absolute Point
	opMDAP1     = 0x2f // .
	opIUP0      = 0x30 // Interpolate Untouched Points through the outline
	opIUP1      = 0x31 // .
	opSHP0      = 0x32 // SHift Point using reference point
	opSHP1      = 0x33 // .
	opSHC0      = 0x34 // SHift Contour using reference point
	opSHC1      = 0x35 // .
	opSHZ0      = 0x36 // SHift Zone using reference point
	opSHZ1      = 0x37 // .
	opSHPIX     = 0x38 // SHift point by a PIXel amount
	opIP        = 0x39 // Interpolate Point
	opMSIRP0    = 0x3a // Move Stack Indirect Relative Point
	opMSIRP1    = 0x3b // .
	opALIGNRP   = 0x3c // ALIGN to Reference Point
	opRTDG      = 0x3d // Round To Double Grid
	opMIAP0     = 0x3e // Move Indirect Absolute Point
	opMIAP1     = 0x3f // .
	opNPUSHB    = 0x40 // PUSH N Bytes
	opNPUSHW    = 0x41 // PUSH N Words
	opWS        = 0x42 // Write Store
	opRS        = 0x43 // Read Store
	opWCVTP     = 0x44 // Write Control Value Table in Pixel units
	opRCVT      = 0x45 // Read Control Value Table entry
	opGC0       = 0x46 // Get Coordinate projected onto the projection vector
	opGC1       = 0x47 // .
	opSCFS      = 0x48 // Sets Coordinate From the Stack using projection vector and freedom vector
	opMD0       = 0x49 // Measure Distance
	opMD1       = 0x4a // .
	opMPPEM     = 0x4b // Measure Pixels Per EM
	opMPS       = 0x4c // Measure Point Size
	opFLIPON    = 0x4d // set the auto FLIP Boolean to ON
	opFLIPOFF   = 0x4e // set the auto FLIP Boolean to OFF
	opDEBUG     = 0x4f // DEBUG call
	opLT        = 0x50 // Less Than
	opLTEQ      = 0x51 // Less Than or EQual
	opGT        = 0x52 // Greater Than
	opGTEQ      = 0x53 // Greater Than or EQual
	opEQ        = 0x54 // EQual
	opNEQ       = 0x55 // Not EQual
	opODD       = 0x56 // ODD
	opEVEN      = 0x57 // EVEN
	opIF        = 0x58 // IF test
	opEIF       = 0x59 // End IF
	opAND       = 0x5a // logical AND
	opOR        = 0x5b // logical OR
	opNOT       = 0x5c // logical NOT
	opDELTAP1   = 0x5d // DELTA exception P1
	opSDB       = 0x5e // Set Delta Base in the graphics state
	opSDS       = 0x5f // Set Delta Shift in the graphics state
	opADD       = 0x60 // ADD
	opSUB       = 0x61 // SUBtract
	opDIV       = 0x62 // DIVide
	opMUL       = 0x63 // MULtiply
	opABS       = 0x64 // ABSolute value
	opNEG       = 0x65 // NEGate
	opFLOOR     = 0x66 // FLOOR
	opCEILING   = 0x67 // CEILING
	opROUND00   = 0x68 // ROUND value
	opROUND01   = 0x69 // .
	opROUND10   = 0x6a // .
	opROUND11   = 0x6b // .
	opNROUND00  = 0x6c // No ROUNDing of value
	opNROUND01  = 0x6d // .
	opNROUND10  = 0x6e // .
	opNROUND11  = 0x6f // .
	opWCVTF     = 0x70 // Write Control Value Table in Funits
	opDELTAP2   = 0x71 // DELTA exception P2
	opDELTAP3   = 0x72 // DELTA exception P3
	opDELTAC1   = 0x73 // DELTA exception C1
	opDELTAC2   = 0x74 // DELTA exception C2
	opDELTAC3   = 0x75 // DELTA exception C3
	opSROUND    = 0x76 // Super ROUND
	opS45ROUND  = 0x77 // Super ROUND 45 degrees
	opJROT      = 0x78 // Jump Relative On True
	opJROF      = 0x79 // Jump Relative On False
	opROFF      = 0x7a // Round OFF
	op_0x7b     = 0x7b // deprecated
	opRUTG      = 0x7c // Round Up To Grid
	opRDTG      = 0x7d // Round Down To Grid
	opSANGW     = 0x7e // Set ANGle Weight
	opAA        = 0x7f // Adjust Angle
	opFLIPPT    = 0x80 // FLIP PoinT
	opFLIPRGON  = 0x81 // FLIP RanGe ON
	opFLIPRGOFF = 0x82 // FLIP RanGe OFF
	op_0x83     = 0x83 // deprecated
	op_0x84     = 0x84 // deprecated
	opSCANCTRL  = 0x85 // SCAN conversion ConTRoL
	opSDPVTL0   = 0x86 // Set Dual Projection Vector To Line
	opSDPVTL1   = 0x87 // .
	opGETINFO   = 0x88 // GET INFOrmation
	opIDEF      = 0x89 // Instruction DEFinition
	opROLL      = 0x8a // ROLL the top three stack elements
	opMAX       = 0x8b // MAXimum of top two stack elements
	opMIN       = 0x8c // MINimum of top two stack elements
	opSCANTYPE  = 0x8d // SCANTYPE
	opINSTCTRL  = 0x8e // INSTRuction execution ConTRoL
	op_0x8f     = 0x8f
	op_0x90     = 0x90
	op_0x91     = 0x91
	op_0x92     = 0x92
	op_0x93     = 0x93
	op_0x94     = 0x94
	op_0x95     = 0x95
	op_0x96     = 0x96
	op_0x97     = 0x97
	op_0x98     = 0x98
	op_0x99     = 0x99
	op_0x9a     = 0x9a
	op_0x9b     = 0x9b
	op_0x9c     = 0x9c
	op_0x9d     = 0x9d
	op_0x9e     = 0x9e
	op_0x9f     = 0x9f
	op_0xa0     = 0xa0
	op_0xa1     = 0xa1
	op_0xa2     = 0xa2
	op_0xa3     = 0xa3
	op_0xa4     = 0xa4
	op_0xa5     = 0xa5
	op_0xa6     = 0xa6
	op_0xa7     = 0xa7
	op_0xa8     = 0xa8
	op_0xa9     = 0xa9
	op_0xaa     = 0xaa
	op_0xab     = 0xab
	op_0xac     = 0xac
	op_0xad     = 0xad
	op_0xae     = 0xae
	op_0xaf     = 0xaf
	opPUSHB000  = 0xb0 // PUSH Bytes
	opPUSHB001  = 0xb1 // .
	opPUSHB010  = 0xb2 // .
	opPUSHB011  = 0xb3 // .
	opPUSHB100  = 0xb4 // .
	opPUSHB101  = 0xb5 // .
	opPUSHB110  = 0xb6 // .
	opPUSHB111  = 0xb7 // .
	opPUSHW000  = 0xb8 // PUSH Words
	opPUSHW001  = 0xb9 // .
	opPUSHW010  = 0xba // .
	opPUSHW011  = 0xbb // .
	opPUSHW100  = 0xbc // .
	opPUSHW101  = 0xbd // .
	opPUSHW110  = 0xbe // .
	opPUSHW111  = 0xbf // .
	opMDRP00000 = 0xc0 // Move Direct Relative Point
	opMDRP00001 = 0xc1 // .
	opMDRP00010 = 0xc2 // .
	opMDRP00011 = 0xc3 // .
	opMDRP00100 = 0xc4 // .
	opMDRP00101 = 0xc5 // .
	opMDRP00110 = 0xc6 // .
	opMDRP00111 = 0xc7 // .
	opMDRP01000 = 0xc8 // .
	opMDRP01001 = 0xc9 // .
	opMDRP01010 = 0xca // .
	opMDRP01011 = 0xcb // .
	opMDRP01100 = 0xcc // .
	opMDRP01101 = 0xcd // .
	opMDRP01110 = 0xce // .
	opMDRP01111 = 0xcf // .
	opMDRP10000 = 0xd0 // .
	opMDRP10001 = 0xd1 // .
	opMDRP10010 = 0xd2 // .
	opMDRP10011 = 0xd3 // .
	opMDRP10100 = 0xd4 // .
	opMDRP10101 = 0xd5 // .
	opMDRP10110 = 0xd6 // .
	opMDRP10111 = 0xd7 // .
	opMDRP11000 = 0xd8 // .
	opMDRP11001 = 0xd9 // .
	opMDRP11010 = 0xda // .
	opMDRP11011 = 0xdb // .
	opMDRP11100 = 0xdc // .
	opMDRP11101 = 0xdd // .
	opMDRP11110 = 0xde // .
	opMDRP11111 = 0xdf // .
	opMIRP00000 = 0xe0 // Move Indirect Relative Point
	opMIRP00001 = 0xe1 // .
	opMIRP00010 = 0xe2 // .
	opMIRP00011 = 0xe3 // .
	opMIRP00100 = 0xe4 // .
	opMIRP00101 = 0xe5 // .
	opMIRP00110 = 0xe6 // .
	opMIRP00111 = 0xe7 // .
	opMIRP01000 = 0xe8 // .
	opMIRP01001 = 0xe9 // .
	opMIRP01010 = 0xea // .
	opMIRP01011 = 0xeb // .
	opMIRP01100 = 0xec // .
	opMIRP01101 = 0xed // .
	opMIRP01110 = 0xee // .
	opMIRP01111 = 0xef // .
	opMIRP10000 = 0xf0 // .
	opMIRP10001 = 0xf1 // .
	opMIRP10010 = 0xf2 // .
	opMIRP10011 = 0xf3 // .
	opMIRP10100 = 0xf4 // .
	opMIRP10101 = 0xf5 // .
	opMIRP10110 = 0xf6 // .
	opMIRP10111 = 0xf7 // .
	opMIRP11000 = 0xf8 // .
	opMIRP11001 = 0xf9 // .
	opMIRP11010 = 0xfa // .
	opMIRP11011 = 0xfb // .
	opMIRP11100 = 0xfc // .
	opMIRP11101 = 0xfd // .
	opMIRP11110 = 0xfe // .
	opMIRP11111 = 0xff // .
)

// popCount is the number of stack elements that each opcode pops.
var popCount = [256]uint8{
	// 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f
	0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 0, 0, 0, 5, // 0x00 - 0x0f
	1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, // 0x10 - 0x1f
	1, 1, 0, 2, 0, 1, 1, 2, 0, 1, 2, 1, 1, 0, 1, 1, // 0x20 - 0x2f
	0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 2, 2, 0, 0, 2, 2, // 0x30 - 0x3f
	0, 0, 2, 1, 2, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 0, // 0x40 - 0x4f
	2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 2, 2, 1, 1, 1, 1, // 0x50 - 0x5f
	2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x60 - 0x6f
	2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 0, 0, 0, 0, 1, 1, // 0x70 - 0x7f
	0, 2, 2, 0, 0, 1, 2, 2, 1, 1, 3, 2, 2, 1, 2, 0, // 0x80 - 0x8f
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x90 - 0x9f
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xa0 - 0xaf
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xb0 - 0xbf
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xc0 - 0xcf
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xd0 - 0xdf
	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xe0 - 0xef
	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xf0 - 0xff
}