18 Commits

Author	SHA1	Message	Date
jst	daa7cf45d3	Return NRGBA images. ... Resizing images with alpha channels is easier for NRGBA, NRGBA64 image types. Support for these is added by providing the necessary resize functions.	2015-03-25 18:38:23 +01:00
jst	53e9ca890b	Fix typos.	2015-03-18 20:19:43 +01:00
jst	d67851ed1f	Explain optimization.	2015-03-18 19:56:53 +01:00
Charlie Vieth	d8255b0421	Optimize bound checks. ... Optimizing the bound checks resulted in an overall 14% increase in conversion performance.	2015-03-15 17:44:39 -04:00
jst	0c6a628df5	Resolve image artifacts due to wrong coefficient index lookup.	2014-09-15 11:50:59 +02:00
jst	581d15cb53	Fix parallel computation.	2014-08-20 21:12:39 +02:00
jst	e950449c49	Fix wrong boundary calculation (bug #17) ... This fix doesn't currently work concurrently. This will be fixed in another commit.	2014-08-20 20:54:59 +02:00
Charlie Vieth	08b124d541	Fix bound out of range panic.	2014-08-12 16:11:25 -04:00
Charlie Vieth	eefd4737aa	Optimize YCbCr image resize	2014-07-30 02:08:58 -04:00
Charlie Vieth	80b3fc2b3f	Pre-calculate start offset, optimize bound check ... Increased performance by 30% for RGBA and 45% for Gray images, minor performance increase for 16-bit images. The start offset calculated by createWeights are stored in a slice and passed to the resize functions to prevent duplication of effort.	2014-07-29 16:53:35 -04:00
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	314cea6612	Avoid temporaries to save some cycles.	2014-01-17 22:54:15 +01:00
jst	a32116ce4a	Add documentation	2012-12-11 20:35:02 +01:00
jst	2d6edc049a	Change ordering	2012-12-11 19:57:34 +01:00
jst	cfcbeb4bb2	Use replicated border in genericConverter	2012-12-10 21:26:34 +01:00
jst	dc1fcd1d24	gofmt	2012-12-10 19:52:41 +01:00
jst	378e366327	Replicate border instead of using a constant ... Constant border could lead to wrong values alpha values with certain configurations.	2012-12-10 19:27:21 +01:00
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