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Convert canvas thumbnails to PNG #6299

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merged 1 commit into from
Sep 10, 2015
Merged

Convert canvas thumbnails to PNG #6299

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23 changes: 17 additions & 6 deletions web/pdf_thumbnail_view.js
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Original file line number Diff line number Diff line change
Expand Up @@ -180,15 +180,9 @@ var PDFThumbnailView = (function PDFThumbnailViewClosure() {
_getPageDrawContext:
function PDFThumbnailView_getPageDrawContext(noCtxScale) {
var canvas = document.createElement('canvas');
canvas.id = this.renderingId;

canvas.className = 'thumbnailImage';
canvas.setAttribute('aria-label', mozL10n.get('thumb_page_canvas',
{page: this.id}, 'Thumbnail of Page {{page}}'));

this.canvas = canvas;
this.div.setAttribute('data-loaded', true);
this.ring.appendChild(canvas);

var ctx = canvas.getContext('2d');
var outputScale = getOutputScale(ctx);
Expand All @@ -199,6 +193,14 @@ var PDFThumbnailView = (function PDFThumbnailViewClosure() {
if (!noCtxScale && outputScale.scaled) {
ctx.scale(outputScale.sx, outputScale.sy);
}
this.image = document.createElement('img');
this.image.id = this.renderingId;
this.image.style.height = canvas.style.height;
this.image.style.width = canvas.style.width;
this.image.className = 'thumbnailImage';
this.image.setAttribute('aria-label', mozL10n.get('thumb_page_canvas',
{ page: this.id }, 'Thumbnail of Page {{page}}'));
this.ring.appendChild(this.image);
return ctx;
},

Expand Down Expand Up @@ -230,6 +232,11 @@ var PDFThumbnailView = (function PDFThumbnailViewClosure() {
rejectRenderPromise(error);
return;
}

self.image.src = self.canvas.toDataURL();
self.canvas.width = 0;
self.canvas.height = 0;
delete self.canvas;
self.renderingState = RenderingStates.FINISHED;

if (!error) {
Expand Down Expand Up @@ -312,6 +319,10 @@ var PDFThumbnailView = (function PDFThumbnailViewClosure() {
}
ctx.drawImage(reducedImage, 0, 0, reducedWidth, reducedHeight,
0, 0, canvas.width, canvas.height);
this.image.src = canvas.toDataURL();
this.canvas.width = 0;
this.canvas.height = 0;
delete this.canvas;
}
};

Expand Down