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Merge pull request #9986 from Snuffleupagus/issue-9984

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Attempt to combine separate beginText/endText sequences in `getTextContent` (issue 9984)
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Tim van der Meij 2018-09-01 21:21:29 +02:00 • committed by GitHub
commit c94df0fef3
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4 changed files with 47 additions and 7 deletions
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46
src/core/evaluator.js
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@ -1510,6 +1510,17 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
textContentItem.str.length = 0;
}
function isIdenticalSetFont(name, size) {
return (textState.font &&
name === textState.fontName && size === textState.fontSize);
}
function handleBeginText() {
flushTextContentItem();
textState.textMatrix = IDENTITY_MATRIX.slice();
textState.textLineMatrix = IDENTITY_MATRIX.slice();
}
function enqueueChunk() {
let length = textContent.items.length;
if (length > 0) {
@ -1535,6 +1546,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
task.ensureNotTerminated();
timeSlotManager.reset();
var stop, operation = {}, args = [];
let pendingBeginText = false;
while (!(stop = timeSlotManager.check())) {
// The arguments parsed by read() are not used beyond this loop, so
// we can reuse the same array on every iteration, thus avoiding
@ -1545,16 +1557,30 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
break;
}
textState = stateManager.state;
var fn = operation.fn;
var fn = operation.fn | 0;
args = operation.args;
var advance, diff;
switch (fn | 0) {
if (pendingBeginText) {
if (fn === OPS.setFont) {
const fontNameArg = args[0].name, fontSizeArg = args[1];
// For multiple identical Tf (setFont) commands, first check if
// the following command is Tm (setTextMatrix) before continuing.
if (isIdenticalSetFont(fontNameArg, fontSizeArg)) {
continue;
}
}
if (fn !== OPS.setTextMatrix) {
handleBeginText();
}
pendingBeginText = false;
}
switch (fn) {
case OPS.setFont:
// Optimization to ignore multiple identical Tf commands.
var fontNameArg = args[0].name, fontSizeArg = args[1];
if (textState.font && fontNameArg === textState.fontName &&
fontSizeArg === textState.fontSize) {
if (isIdenticalSetFont(fontNameArg, fontSizeArg)) {
break;
}
@ -1642,9 +1668,15 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
textState.wordSpacing = args[0];
break;
case OPS.beginText:
flushTextContentItem();
textState.textMatrix = IDENTITY_MATRIX.slice();
textState.textLineMatrix = IDENTITY_MATRIX.slice();
// Optimization to attempt to combine separate BT/ET sequences,
// by checking the next operator(s) before flushing text content
// and resetting the text/textLine matrices (see above).
if (combineTextItems) {
pendingBeginText = true;
break;
}
handleBeginText();
break;
case OPS.showSpacedText:
var items = args[0];