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120 Commits

Author SHA1 Message Date
jst 79dc2b616d Add functions for nearest-neighbor resize of NRGBA, NRGBA16. 2015-03-25 20:17:14 +01:00
jst ebea2e66be Support image.NRGBA, image.NRGBA16 in resize.Resize function. 2015-03-25 18:47:07 +01:00
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 4b952c4b95 Merge branch 'charlievieth-master' 2015-03-18 19:57:50 +01:00
jst d67851ed1f Explain optimization. 2015-03-18 19:56:53 +01:00
Charlie Vieth 962e93a6e5 Merge branch 'optimization' 2015-03-15 18:01:18 -04:00
Charlie Vieth 076a9ce3b9 Limit spawned goroutines to GOMAXPROCS(0). 
This change sets the number of spawned goroutines to the GOMAXPROCS
value set by the user.

Using more goroutines than available execution threads is slightly
detrimental to performance (~0.5%), and prevents users of the library
from controlling the number of spawned goroutines.
 2015-03-15 17:59:38 -04:00
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
Charlie Vieth b09281bd36 Update benchmarks to focus on conversion performance. 
Benchmark each interpolation function for RGBA and YCbCr images.
Reduce the image size used when benchmarking to reduce the influence of
memory performance on results.
 2015-03-15 17:40:38 -04:00
jst 8f44931448 Merge branch 'master' of https://github.com/nfnt/resize 2014-12-17 11:23:53 +01:00
jst 9485f5475a Return input image if output dimensions equal input dimensions. 2014-12-17 11:10:53 +01:00
jst 87b3f9b017 Merge pull request #23 from dlackty/patch-1 
Use SVG version badge for Travis CI
 2014-12-03 19:40:17 +01:00
Richard Lee f49722caca Use SVG version badge for Travis CI 2014-11-21 17:00:51 +08:00
jst 7e2ce0a2ea Go >=1.1 is needed for this package. 2014-10-24 14:47:00 +02:00
jst 13ea1287b3 Test using all available versions of Go. 2014-10-24 14:41:49 +02:00
jst 20c6afea04 Remove unnecessary benchmark 2014-09-15 11:58:05 +02:00
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
jst 03982f698d Merge branch 'charlievieth-master' 2014-08-13 20:13:24 +02:00
jst 220cad3343 Add simple test case for input image with non-trivial bounds. 2014-08-13 20:12:18 +02:00
jst 7f8a5419ae Merge branch 'master' of https://github.com/charlievieth/resize into charlievieth-master 2014-08-13 20:10:38 +02:00
Charlie Vieth df655f3f70 Merge branch 'YCC' 2014-08-12 16:11:40 -04:00
Charlie Vieth 08b124d541 Fix bound out of range panic. 2014-08-12 16:11:25 -04:00
Charlie Vieth 171c886e38 Merge branch 'YCC' 2014-08-12 14:41:55 -04:00
Charlie Vieth f03c78969b Fix YCC SubImage. 2014-08-12 14:41:20 -04:00
Charlie Vieth 3c164b34f4 Merge branch 'YCC' 2014-08-12 14:22:17 -04:00
Charlie Vieth acea8646b2 Fix error in YCC PixOffset and SubImage. 2014-08-12 14:22:06 -04:00
jst ccddecd1bf Merge branch 'charlievieth-master' 2014-08-05 18:01:45 +02:00
Charlie Vieth a5a6a66088 Merge branch 'refactor' 2014-07-30 02:09:28 -04:00
Charlie Vieth eefd4737aa Optimize YCbCr image resize 2014-07-30 02:08:58 -04:00
Charlie Vieth ee540982e0 Merge branch 'refactor' 2014-07-29 18:48:50 -04:00
Charlie Vieth 427b8d133e Optimized Nearest-Neighbor function - 2x faster 2014-07-29 18:32:58 -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 be07665345 Update README.md 2014-07-19 14:00:14 +02:00
jst 299762ed77 Add unit tests for converter.go 2014-07-19 13:31:16 +02:00
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 bdfbbead13 Merge branch 'anisus-master' 
Fixes #14, regression from 494d8de4e5
 2014-06-18 19:05:59 +02:00
Accipiter Nisus f3cac2f865 Fix to resize correctly when source image.Bounds().Min is not (0,0) 2014-06-16 13:53:36 +10:00
jst 8aee0d995b Update README.md to mention resize.Thumbnail. 2014-01-30 20:03:15 +01:00
jst 079ed2e48a Merge branch 'master' of https://github.com/matrixik/resize into matrixik-master 2014-01-30 19:40:14 +01:00
jst a83cb40860 Remove some redundancies. 2014-01-28 19:53:26 +01:00
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 9884534579 Cache kernel weights for each row. 
For each row the convolution kernel is evaluated at fixed positions around "u". By calculating these values once for each row, a huge speedup is achieved.
 2014-01-28 18:48:08 +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 45368ad0cd Multiply instead of dividing 2014-01-17 23:14:37 +01:00
jst 314cea6612 Avoid temporaries to save some cycles. 2014-01-17 22:54:15 +01:00
jst 7c5018c82b Extract method "resizeSlice" to reduce duplicate code. 2014-01-17 19:05:30 +01:00
Dobrosław Żybort b744503c5c Add: thumbnail helper function 2013-11-27 22:40:16 +01:00