JDK-8125256 : JPEG loading is really slow for thumbnails
- Type: Bug
- Component: javafx
- Sub-Component: graphics
- Affected Version: 8
- Priority: P3
- Status: Resolved
- Resolution: Fixed
- Submitted: 2012-08-30
- Updated: 2015-06-17
- Resolved: 2012-08-30
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| JDK 8 |
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8Fixed  |
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Description
When loading images with new Image(<URL>, <thumb_width>, <thumb_height>, true, true) when the source image is much bigger than the thumbnail size. We are really slow at this especially on embedded Beagle. We used to have support for libjpeg sub-sampling for 50%, 25% etc but after some digging it was removed in a bug fix in Feb 2010 RT-7536 so we need to put this back in. It turned out the old code was incorrect because it asked libjpeg for a exact fraction when the docs say only 1/1, 1/2, 1/4 and 1/8 are supported. I have attached a test case. Test numbers for before and after fix are: BEAGLE 3.0 LOAD at 100% took = 3915ms LOAD at 50% took = 8658ms LOAD at 25% took = 6987ms LOAD at 12.5% took = 5938ms LOAD at 6.25% took = 5485ms LOAD at 60x60 THUMBNAIL took = 5184ms after fix LOAD at 100% took = 3995ms LOAD at 50% took = 1354ms LOAD at 25% took = 630ms LOAD at 12.5% took = 514ms LOAD at 6.25% took = 590ms LOAD at 60x60 THUMBNAIL took = 523ms This shows a nice 8x to 10x improvement for all requested sizes 50% or less. On desktop this is only a 4x-5x but still nice.
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