Sakurai/pdf.js
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Merge remote-tracking branch 'upstream/master' into smaskscale

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This commit is contained in:
Brendan Dahl 2011-12-16 10:11:40 -08:00
commit 3175e5498c
1 changed files with 14 additions and 26 deletions
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38
src/canvas.js
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@ -257,9 +257,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
this.ctx.scale(cw / mediaBox.width, ch / mediaBox.height);
this.textDivs = [];
this.textLayerQueue = [];
// Prevent textLayerQueue from being rendered while rendering a new page
if (this.textLayerTimer)
clearTimeout(this.textLayerTimer);
},
executeIRQueue: function canvasGraphicsExecuteIRQueue(codeIR,
@ -328,31 +325,22 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
return;
var self = this;
var renderTextLayer = function canvasRenderTextLayer() {
var textDivs = self.textDivs;
for (var i = 0, length = textDivs.length; i < length; ++i) {
if (textDivs[i].dataset.textLength > 1) { // avoid div by zero
textLayer.appendChild(textDivs[i]);
var textDivs = this.textDivs;
this.textLayerTimer = setInterval(function renderTextLayer() {
if (textDivs.length === 0) {
clearInterval(self.textLayerTimer);
return;
}
var textDiv = textDivs.shift();
if (textDiv.dataset.textLength > 1) { // avoid div by zero
textLayer.appendChild(textDiv);
// Adjust div width (via letterSpacing) to match canvas text
// Due to the .offsetWidth calls, this is slow
textDivs[i].style.letterSpacing =
((textDivs[i].dataset.canvasWidth - textDivs[i].offsetWidth) /
(textDivs[i].dataset.textLength - 1)) + 'px';
textDiv.style.letterSpacing =
((textDiv.dataset.canvasWidth - textDiv.offsetWidth) /
(textDiv.dataset.textLength - 1)) + 'px';
}
}
}
var textLayerQueue = this.textLayerQueue;
textLayerQueue.push(renderTextLayer);
// Lazy textLayer rendering (to prevent UI hangs)
// Only render queue if activity has stopped, where "no activity" ==
// "no beginDrawing() calls in the last N ms"
this.textLayerTimer = setTimeout(function renderTextLayerQueue() {
// Render most recent (==most relevant) layers first
for (var i = textLayerQueue.length - 1; i >= 0; i--) {
textLayerQueue.pop().call();
}
}, 500);
}, 0);
},
// Graphics state