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add image size constraint

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constrain image file size and scale down image if necessary
This commit is contained in:
Georg Fischer 2013-09-28 13:29:35 +02:00
parent 97c8e633ac
commit 5bc03c7ce7
1 changed files with 24 additions and 0 deletions
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24
scripts/src/image.js
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@ -5,6 +5,9 @@ define(
var signals;
var image;
var initialized = false;
// max 2k px per side, so 2000 * 2000
var max_image_area = 4000000;
function init( shared )
{
@ -22,6 +25,8 @@ define(
function imageLoaded()
{
constrainImageSize( image );
signals['image-loaded'].dispatch( image );
initialized = true;
}
@ -39,6 +44,25 @@ define(
setTimeout( imageLoaded, 10 );
}
}
function constrainImageSize( img )
{
var ratio = 0;
var image_width = img.width;
var image_height = img.height;
var image_area = image_width * image_height;
if ( image_area > max_image_area )
{
ratio = max_image_area / image_area;
image_width *= ratio;
image_height *= ratio;
img.naturalWidth = Math.floor( image_width );
img.naturalWidth = Math.floor( image_height );
}
}
return { init: init };
}