nfnt
c3c062672a
Reverse alpha-premultiplication for image.RGBA, image.RGBA64 and generic images
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types.
2015-05-12 15:19:11 +02:00
jst
daa7cf45d3
Return NRGBA images.
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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.
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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 )
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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
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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.
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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
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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
