in src/core/type1_parser.js [90:324]
convert(encoded, subrs, seacAnalysisEnabled) {
const count = encoded.length;
let error = false;
let wx, sbx, subrNumber;
for (let i = 0; i < count; i++) {
let value = encoded[i];
if (value < 32) {
if (value === 12) {
value = (value << 8) + encoded[++i];
}
switch (value) {
case 1: // hstem
if (!HINTING_ENABLED) {
this.stack = [];
break;
}
error = this.executeCommand(2, COMMAND_MAP.hstem);
break;
case 3: // vstem
if (!HINTING_ENABLED) {
this.stack = [];
break;
}
error = this.executeCommand(2, COMMAND_MAP.vstem);
break;
case 4: // vmoveto
if (this.flexing) {
if (this.stack.length < 1) {
error = true;
break;
}
// Add the dx for flex and but also swap the values so they are
// the right order.
const dy = this.stack.pop();
this.stack.push(0, dy);
break;
}
error = this.executeCommand(1, COMMAND_MAP.vmoveto);
break;
case 5: // rlineto
error = this.executeCommand(2, COMMAND_MAP.rlineto);
break;
case 6: // hlineto
error = this.executeCommand(1, COMMAND_MAP.hlineto);
break;
case 7: // vlineto
error = this.executeCommand(1, COMMAND_MAP.vlineto);
break;
case 8: // rrcurveto
error = this.executeCommand(6, COMMAND_MAP.rrcurveto);
break;
case 9: // closepath
// closepath is a Type1 command that does not take argument and is
// useless in Type2 and it can simply be ignored.
this.stack = [];
break;
case 10: // callsubr
if (this.stack.length < 1) {
error = true;
break;
}
subrNumber = this.stack.pop();
if (!subrs[subrNumber]) {
error = true;
break;
}
error = this.convert(subrs[subrNumber], subrs, seacAnalysisEnabled);
break;
case 11: // return
return error;
case 13: // hsbw
if (this.stack.length < 2) {
error = true;
break;
}
// To convert to type2 we have to move the width value to the
// first part of the charstring and then use hmoveto with lsb.
wx = this.stack.pop();
sbx = this.stack.pop();
this.lsb = sbx;
this.width = wx;
this.stack.push(wx, sbx);
error = this.executeCommand(2, COMMAND_MAP.hmoveto);
break;
case 14: // endchar
this.output.push(COMMAND_MAP.endchar[0]);
break;
case 21: // rmoveto
if (this.flexing) {
break;
}
error = this.executeCommand(2, COMMAND_MAP.rmoveto);
break;
case 22: // hmoveto
if (this.flexing) {
// Add the dy for flex.
this.stack.push(0);
break;
}
error = this.executeCommand(1, COMMAND_MAP.hmoveto);
break;
case 30: // vhcurveto
error = this.executeCommand(4, COMMAND_MAP.vhcurveto);
break;
case 31: // hvcurveto
error = this.executeCommand(4, COMMAND_MAP.hvcurveto);
break;
case (12 << 8) + 0: // dotsection
// dotsection is a Type1 command to specify some hinting feature
// for dots that do not take a parameter and it can safely be
// ignored for Type2.
this.stack = [];
break;
case (12 << 8) + 1: // vstem3
if (!HINTING_ENABLED) {
this.stack = [];
break;
}
// [vh]stem3 are Type1 only and Type2 supports [vh]stem with
// multiple parameters, so instead of returning [vh]stem3 take a
// shortcut and return [vhstem] instead.
error = this.executeCommand(2, COMMAND_MAP.vstem);
break;
case (12 << 8) + 2: // hstem3
if (!HINTING_ENABLED) {
this.stack = [];
break;
}
// See vstem3.
error = this.executeCommand(2, COMMAND_MAP.hstem);
break;
case (12 << 8) + 6: // seac
// seac is like type 2's special endchar but it doesn't use the
// first argument asb, so remove it.
if (seacAnalysisEnabled) {
const asb = this.stack.at(-5);
this.seac = this.stack.splice(-4, 4);
this.seac[0] += this.lsb - asb;
error = this.executeCommand(0, COMMAND_MAP.endchar);
} else {
error = this.executeCommand(4, COMMAND_MAP.endchar);
}
break;
case (12 << 8) + 7: // sbw
if (this.stack.length < 4) {
error = true;
break;
}
// To convert to type2 we have to move the width value to the
// first part of the charstring and then use rmoveto with
// (dx, dy). The height argument will not be used for vmtx and
// vhea tables reconstruction -- ignoring it.
this.stack.pop(); // wy
wx = this.stack.pop();
const sby = this.stack.pop();
sbx = this.stack.pop();
this.lsb = sbx;
this.width = wx;
this.stack.push(wx, sbx, sby);
error = this.executeCommand(3, COMMAND_MAP.rmoveto);
break;
case (12 << 8) + 12: // div
if (this.stack.length < 2) {
error = true;
break;
}
const num2 = this.stack.pop();
const num1 = this.stack.pop();
this.stack.push(num1 / num2);
break;
case (12 << 8) + 16: // callothersubr
if (this.stack.length < 2) {
error = true;
break;
}
subrNumber = this.stack.pop();
const numArgs = this.stack.pop();
if (subrNumber === 0 && numArgs === 3) {
const flexArgs = this.stack.splice(-17, 17);
this.stack.push(
flexArgs[2] + flexArgs[0], // bcp1x + rpx
flexArgs[3] + flexArgs[1], // bcp1y + rpy
flexArgs[4], // bcp2x
flexArgs[5], // bcp2y
flexArgs[6], // p2x
flexArgs[7], // p2y
flexArgs[8], // bcp3x
flexArgs[9], // bcp3y
flexArgs[10], // bcp4x
flexArgs[11], // bcp4y
flexArgs[12], // p3x
flexArgs[13], // p3y
flexArgs[14] // flexDepth
// 15 = finalx unused by flex
// 16 = finaly unused by flex
);
error = this.executeCommand(13, COMMAND_MAP.flex, true);
this.flexing = false;
this.stack.push(flexArgs[15], flexArgs[16]);
} else if (subrNumber === 1 && numArgs === 0) {
this.flexing = true;
}
break;
case (12 << 8) + 17: // pop
// Ignore this since it is only used with othersubr.
break;
case (12 << 8) + 33: // setcurrentpoint
// Ignore for now.
this.stack = [];
break;
default:
warn('Unknown type 1 charstring command of "' + value + '"');
break;
}
if (error) {
break;
}
continue;
} else if (value <= 246) {
value -= 139;
} else if (value <= 250) {
value = (value - 247) * 256 + encoded[++i] + 108;
} else if (value <= 254) {
value = -((value - 251) * 256) - encoded[++i] - 108;
} else {
value =
((encoded[++i] & 0xff) << 24) |
((encoded[++i] & 0xff) << 16) |
((encoded[++i] & 0xff) << 8) |
((encoded[++i] & 0xff) << 0);
}
this.stack.push(value);
}
return error;
}