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Fixes drawImage for thumbs

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This commit is contained in:
Yury Delendik 2014-06-12 10:28:42 -05:00
parent 12a35f2878
commit a338a7966d
2 changed files with 41 additions and 1 deletions
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40
web/thumbnail_view.js
View File

@ -174,6 +174,17 @@ var ThumbnailView = function thumbnailView(container, id, defaultViewport) {
this.hasImage = true;
};
function getTempCanvas(width, height) {
var tempCanvas = ThumbnailView.tempImageCache;
if (!tempCanvas) {
tempCanvas = document.createElement('canvas');
ThumbnailView.tempImageCache = tempCanvas;
}
tempCanvas.width = width;
tempCanvas.height = height;
return tempCanvas;
}
this.setImage = function thumbnailViewSetImage(img) {
if (!this.pdfPage) {
var promise = PDFView.getPage(this.id);
@ -188,9 +199,36 @@ var ThumbnailView = function thumbnailView(container, id, defaultViewport) {
}
this.renderingState = RenderingStates.FINISHED;
var ctx = this.getPageDrawContext();
ctx.drawImage(img, 0, 0, img.width, img.height,
var reducedImage = img;
var reducedWidth = img.width;
var reducedHeight = img.height;
// drawImage does an awful job of rescaling the image, doing it gradually
var MAX_SCALE_FACTOR = 2.0;
if (Math.max(img.width / ctx.canvas.width,
img.height / ctx.canvas.height) > MAX_SCALE_FACTOR) {
reducedWidth >>= 1;
reducedHeight >>= 1;
reducedImage = getTempCanvas(reducedWidth, reducedHeight);
var reducedImageCtx = reducedImage.getContext('2d');
reducedImageCtx.drawImage(img, 0, 0, img.width, img.height,
0, 0, reducedWidth, reducedHeight);
while (Math.max(reducedWidth / ctx.canvas.width,
reducedHeight / ctx.canvas.height) > MAX_SCALE_FACTOR) {
reducedImageCtx.drawImage(reducedImage,
0, 0, reducedWidth, reducedHeight,
0, 0, reducedWidth >> 1, reducedHeight >> 1);
reducedWidth >>= 1;
reducedHeight >>= 1;
}
}
ctx.drawImage(reducedImage, 0, 0, reducedWidth, reducedHeight,
0, 0, ctx.canvas.width, ctx.canvas.height);
this.hasImage = true;
};
};
ThumbnailView.tempImageCache = null;

2
web/viewer.js
View File

@ -1260,6 +1260,8 @@ var PDFView = {
}
}
this.pdfDocument.cleanup();
ThumbnailView.tempImageCache = null;
},
getHighestPriority: function pdfViewGetHighestPriority(visible, views,