17 Commits

Author	SHA1	Message	Date
jst	016a61cd31	Optimize data-locality for a huge increase in processing speed. ... This is a complete rewrite! The tight scaling loop needs data locality for optimal performance. The old version used lots of pointer redirections to access image data which was bad for data locality. By providing the complete loop for each image type, this problem is solved. Unfortunately this increases code duplication but the result should be worth it: I could measure a ~6x speed-up for certain test cases!	2014-07-19 13:19:31 +02:00
jst	446eea2f7b	Remove LUT based filters. ... Caching kernel weights makes using the LUT based approach obsolete. Now they seem to be even slower than their counterparts.	2014-01-28 18:54:57 +01:00
jst	8f586c4f06	Add benchmarks to compare execution times. ... Run "go test -bench LargeJpegThumb" to benchmark all functions at once.	2014-01-18 11:55:34 +01:00
jst	252ccc84a2	Add benchmarks for Lanczos3Lut to compare it with Lanczos3 performance.	2013-07-08 20:55:46 +02:00
jst	da95f74904	go fmt	2013-03-10 11:55:50 +01:00
jst	852f4a47e7	Merge branch 'no-image-shift' of http://github.com/jsummers/nfnt.resize ... Merge branch 'fix-canvas-size-issue'	2013-03-10 11:33:44 +01:00
jst	84039c403b	Test for correct canvas size.	2013-03-10 10:58:08 +01:00
Jason Summers	3d9094eb9e	Center the resized image on the canvas, instead of shifting it slightly	2012-11-27 20:38:19 -05:00
jst	3e06045c3f	Speed up computation: Try to avoid Image.At() as much as possible -> specialized color access for some image types	2012-09-21 20:02:25 +02:00
jst	e548f52385	Blur input image during downscaling by scaling the filter kernel to prevent moires in the output image	2012-09-19 21:03:56 +02:00
jst	d0b2b9bc39	Added MitchellNetravali, changed Lanczos a bit	2012-09-19 19:32:00 +02:00
jst	3fc31c95cc	Kernel simplified	2012-09-15 19:30:32 +02:00
jst	339b8fd43a	Speed up calculation by avoiding dynamic casting	2012-09-01 00:21:10 +02:00
jst	9041d4db18	Function signature changed again, no need for multiple return value	2012-08-09 18:58:57 +02:00
jst	14d51db8b4	Changed function signature to include error handling. Filters simplified.	2012-08-08 21:32:51 +02:00
nfnt	fdc4a64918	Tests added	2012-08-03 18:12:26 +02:00
nfnt	428642c9f1	initial commit	2012-08-02 21:59:40 +02:00