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16 Commits

Author SHA1 Message Date
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