Jorge Rodriguez
cf6f69cdc9
Fix the calculation of the input image shift when using subpixel regions. Includes some more tests which had incorrect results before and now work fine.
2015-11-08 16:40:32 -08:00
Sean Barrett
0fc13e997b
optimization attempts, no meaningful changes
2014-09-17 06:24:40 -07:00
Jorge Rodriguez
cbf5ebbd35
Install ryg's float -> uint8 sRGB conversion code, which is much faster.
2014-09-16 10:36:19 -07:00
Jorge Rodriguez
600d80387e
Make a guess at the value before doing the binary search, cuts the number of conditionals by half. Not as much gain as I hoped but something.
2014-09-15 14:01:11 -07:00
Sean Barrett
dd28033b34
don't encode alpha channel twice when alpha is different colorspace from other channels
2014-09-15 07:23:22 -07:00
Sean Barrett
9f66b441bd
new quickstart docs;
...
reformat docs;
new simple uint32 test
2014-09-14 14:55:23 -07:00
Jorge Rodriguez
f0ba7f5f7e
Get rid of old perf tests.
2014-09-13 13:42:50 -07:00
Sean Barrett
f711fdcb0f
disable performance test in test code, back to regression test path
2014-09-13 08:22:15 -07:00
Sean Barrett
9a6af9a8d3
replace int(floor()) with int(), since that produces same results for non-negative values and is much faster on 32-bit x86
2014-09-13 08:12:37 -07:00
Sean Barrett
1dcca19ae0
because of we divide by /255 not /256, we lose numerical precision, so can't guarantee that box filter results round to same results as naive
2014-09-13 08:06:39 -07:00
Sean Barrett
972456cb63
explicit performance tests variants
2014-09-13 06:53:53 -07:00
Sean Barrett
c9600c012f
unroll channel loops in downsampler
2014-09-13 06:23:07 -07:00
Sean Barrett
0fa5b5c66f
rename cubic to cubicbspline;
...
tweak filter type documentation
2014-09-13 05:52:19 -07:00
Sean Barrett
29b36b3dea
rename filters, document them
2014-09-12 05:28:24 -07:00
Sean Barrett
da2aa8f6b7
checkboard test to verify srgb
2014-09-12 05:04:38 -07:00
Sean Barrett
a9778b8dbd
tweak docs; fix compile error in UNUSED_PARAM stuff
2014-09-12 04:46:41 -07:00
Sean Barrett
7a4f1f4665
update with new tests for srgb conversion
2014-09-11 02:10:37 -07:00
Sean Barrett
16d68d14f8
fix stbir__linear_to_srgb_uchar:
...
1. table stored threshhold of transition from i to i+1, but wants to be i-1 to i
2. table was computed by dividing uchar by 256.0 instead of 255.0, causing it to be 100% wrong
2014-09-11 02:05:53 -07:00
Sean Barrett
30c7a981ec
compile as C;
...
fix some unsigned/signed comparisons;
avoid round() since it's not in pre-C99 C;
remove MAX_CHANNELS since I never ended up needing it;
rename STBIR_EPSILON to STBIR_ALPHA_EPSILON;
don't use STBIR_ALPHA_EPSILON on float input (can't remove it properly due to numeric precision, and they can do it themselves);
optimize subtraction of STBIR_ALPHA_EPSILON;
sorry i forgot to commit these separately!;
2014-09-11 01:47:50 -07:00
Sean Barrett
1208730e1e
Merge branch 'resample' of http://github.com/bsvino/stb into resample
2014-09-11 01:15:09 -07:00
Jorge Rodriguez
953a637841
Use a carefully shaped trapezoid instead of a box filter to avoid jumps between pixel values.
2014-09-10 19:08:11 -07:00
Sean Barrett
4e580cf9ed
fix compile
2014-09-10 15:11:35 -07:00
Jorge Rodriguez
c9d67446d2
Reverse allocation routines parameter order so that the context is at the back.
2014-09-09 22:57:15 -07:00
Jorge Rodriguez
41e6aad693
Avoid repeated adds and ensure correct round-trip result.
2014-09-09 21:57:46 -07:00
Jorge Rodriguez
969ff7c850
Make sure calculate_memory matches with the allocations. Fix some errant asserts.
2014-09-09 20:51:29 -07:00
Jorge Rodriguez
4b69c0637e
If alpha is zero then sneakily replace it with a very small nonzero so that the color data is preserved.
...
Pre-process n1 so that we don't have to do it later on. Can't do n0 since it's used to find the coefficient index.
2014-09-09 18:38:05 -07:00
Jorge Rodriguez
084baed15c
Replace premul test with better premul test that doesn't require visual inspection.
2014-09-09 16:30:06 -07:00
Jorge Rodriguez
497eab8339
Normalize downsample coefficients.
2014-09-09 15:22:29 -07:00
Jorge Rodriguez
43fbc1d5e3
Rearrange the algebra on two of the filters to avoid repeating decimals which cause precision loss. Use int32 to test filters because it's more accurate.
2014-09-09 14:10:14 -07:00
Jorge Rodriguez
ca241daefa
Use rounding to try to preserve the original value. Fix test case.
2014-09-09 12:16:23 -07:00
Jorge Rodriguez
118f28557e
Tests to ensure images of a solid color stay the same solid color after resampling.
2014-09-07 16:47:02 -07:00
Jorge Rodriguez
e6c47ec657
Fix kernel lookup for downsampling.
2014-09-07 12:57:53 -07:00
Jorge Rodriguez
8cc6a3abfc
If there's no context we're using the simple API functions - fall back to malloc and free.
2014-09-07 10:02:51 -07:00
Sean Barrett
36db03f390
tighten bounds on filter normalization test
2014-09-07 05:31:40 -07:00
Sean Barrett
7f8ac35e42
check whether filter kernels are normalized
2014-09-07 05:29:43 -07:00
Sean Barrett
7da729bfce
restore correct definition of box
2014-09-07 04:07:07 -07:00
Sean Barrett
08ca345839
Merge branch 'resample2' into resample
2014-09-07 03:36:16 -07:00
Sean Barrett
cd1fbacbb6
rename NEAREST to BOX
...
write test for BOX
2014-09-07 03:19:18 -07:00
Jorge Rodriguez
586e84087c
Correctly specify alpha channels.
2014-09-06 21:50:28 -07:00
Jorge Rodriguez
38ce5494bc
Clarify some comments. Make stbir__resize_arbitrary an internal function. Update test cases to use actual API functions.
2014-09-06 20:17:19 -07:00
Sean Barrett
41555b5d53
update test cases to work on things other than barbara.png
2014-09-06 14:58:32 -07:00
Jorge Rodriguez
fb059fcece
Progress report.
2014-09-06 10:57:21 -07:00
Jorge Rodriguez
75bdd2da83
Fix malloc context and whitespace.
2014-09-06 08:48:46 -07:00
Sean Barrett
aee30095c7
refactor internal interfaces to avoid passing things multiple times;
...
finish prepping 'stbir__info' even before calculate_memory;
get rid of 'noinfo' functions since now calculate_memory doesn't need 'em;
add new binary-searched sRGB function (untested)
2014-09-01 16:52:04 -07:00
Sean Barrett
732fec68ee
tweak new API, get it partly working
2014-08-31 08:55:41 -07:00
Sean Barrett
664d8961f5
new API partially in-use
2014-08-31 08:34:05 -07:00
Sean Barrett
2549d8156e
in-progress refactoring
2014-08-31 07:23:34 -07:00
Sean Barrett
6ef563d089
rename to stb_image_resize.h
2014-08-18 09:12:59 -07:00
Sean Barrett
eb0781fda0
add comments describing the purpose of the s,t-rectangle tests
2014-08-18 09:01:33 -07:00
Sean Barrett
9ba3dc1fc5
make resample tests work in VC6
2014-08-18 08:56:44 -07:00
