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Optimized CanvasGraphics_executeOperatorList 66% faster

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p01 2014-06-02 14:40:33 +02:00
parent d4a01f6034
commit 35e418c603
1 changed files with 19 additions and 14 deletions
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33
src/display/canvas.js
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@ -394,6 +394,8 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
// Defines the time the executeOperatorList is going to be executing
// before it stops and shedules a continue of execution.
var EXECUTION_TIME = 15;
// Defines the number of steps before checking the execution time
var EXECUTION_STEPS = 10;
function CanvasGraphics(canvasCtx, commonObjs, objs, imageLayer) {
this.ctx = canvasCtx;
@ -726,18 +728,21 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var argsArrayLen = argsArray.length;
// Sometimes the OperatorList to execute is empty.
if (argsArrayLen == i) {
if (argsArrayLen === i) {
return i;
}
var endTime = Date.now() + EXECUTION_TIME;
var chunkOperations = (argsArrayLen - i > EXECUTION_STEPS &&
typeof continueCallback === 'function');
var endTime = chunkOperations ? Date.now() + EXECUTION_TIME : 0;
var steps = 0;
var commonObjs = this.commonObjs;
var objs = this.objs;
var fnId;
while (true) {
if (stepper && i === stepper.nextBreakPoint) {
if (stepper !== undefined && i === stepper.nextBreakPoint) {
stepper.breakIt(i, continueCallback);
return i;
}
@ -750,16 +755,13 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var deps = argsArray[i];
for (var n = 0, nn = deps.length; n < nn; n++) {
var depObjId = deps[n];
var common = depObjId.substring(0, 2) == 'g_';
var common = depObjId[0] === 'g' && depObjId[1] === '_';
var objsPool = common ? commonObjs : objs;
// If the promise isn't resolved yet, add the continueCallback
// to the promise and bail out.
if (!common && !objs.isResolved(depObjId)) {
objs.get(depObjId, continueCallback);
return i;
}
if (common && !commonObjs.isResolved(depObjId)) {
commonObjs.get(depObjId, continueCallback);
if (!objsPool.isResolved(depObjId)) {
objsPool.get(depObjId, continueCallback);
return i;
}
}
@ -768,15 +770,18 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
i++;
// If the entire operatorList was executed, stop as were done.
if (i == argsArrayLen) {
if (i === argsArrayLen) {
return i;
}
// If the execution took longer then a certain amount of time and
// `continueCallback` is specified, interrupt the execution.
if (continueCallback && Date.now() > endTime) {
continueCallback();
return i;
if (chunkOperations && ++steps > EXECUTION_STEPS) {
if (Date.now() > endTime) {
continueCallback();
return i;
}
steps = 0;
}
// If the operatorList isn't executed completely yet OR the execution