Sakurai/pdf.js
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Leave div commands on stack and change evaluation.

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This commit is contained in:
Brendan Dahl 2012-07-19 18:06:37 -07:00
parent ac005ed359
commit 8fccd19948
1 changed files with 34 additions and 23 deletions
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57
src/fonts.js
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@ -3422,25 +3422,35 @@ var Type1Parser = function type1Parser() {
var kEscapeCommand = 12;
// The initial stack can have numbers expressed with the div command which
// need to be calculated before conversion. Looking at the spec it doesn't
// appear div should even be allowed as a first command but there have been
// a number of fonts that have this.
function evaluateStack(stack) {
var newStack = [];
for (var i = 0, ii = stack.length; i < ii; i++) {
var token = stack[i];
if (token === 'div') {
var b = newStack.pop();
var a = newStack.pop();
newStack.push(a / b);
} else if (isInt(token)) {
newStack.push(token);
// Breaks up the stack by arguments and also calculates the value.
function breakUpArgs(stack, numArgs) {
var args = [];
var index = stack.length - 1;
for (var i = 0; i < numArgs; i++) {
if (index < 0) {
args.unshift({ arg: [0],
value: 0 });
warn('Malformed charstring stack: not enough values on stack.');
continue;
}
if (stack[index] === 'div') {
var a = stack[index - 2];
var b = stack[index - 1];
if (!isInt(a) || !isInt(b)) {
warn('Malformed charsting stack: expected ints on stack for div.');
a = 0;
b = 1;
}
args.unshift({ arg: [a, b, 'div'],
value: a / b });
index -= 3;
} else {
warn('Unsupported initial stack ' + stack);
args.unshift({ arg: stack.slice(index, index + 1),
value: stack[index] });
index--;
}
}
return newStack;
return args;
}
function decodeCharString(array) {
@ -3493,13 +3503,14 @@ var Type1Parser = function type1Parser() {
command = charStringDictionary['12'][escape];
} else {
if (value == 13) { // hsbw
charstring = evaluateStack(charstring);
if (charstring.length !== 2)
warn('Unsupported hsbw format.');
lsb = charstring[0];
width = charstring[1];
charstring.splice(0, 1);
charstring.push(lsb, 'hmoveto');
var args = breakUpArgs(charstring, 2);
lsb = args[0]['value'];
width = args[1]['value'];
// To convert to type2 we have to move the width value to the first
// part of the charstring and then use hmoveto with lsb.
charstring = args[1]['arg'];
charstring = charstring.concat(args[0]['arg']);
charstring.push('hmoveto');
continue;
} else if (value == 10) { // callsubr
if (charstring[charstring.length - 1] < 3) { // subr #0..2