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610 Commits

Author SHA1 Message Date
Sean Barrett 69d4c6738b Merge branch 'master' of http://github.com/rygorous/stb into working 2014-09-18 07:10:43 -07:00
Sean Barrett 17e82a4080 Merge branch 'master' into working 2014-09-18 07:10:18 -07:00
Fabian Giesen f36b7116e2 Fix a few bugs with subpixel shifts, shift_y in particular. 
1. In the presence of nonzero shift_x / shift_y,
   stbtt_GetGlyphBitmapBoxSubpixel would return a nonzero-sized bounding
   box for empty glyphs (e.g. spaces). Since such glyphs don't have any
   outlines, the rasterizer wouldn't do anything, resulting in a 1x1-pixel
   image with uninitialized memory.
2. GetGlyphBitmapBoxSubpixel added shift_y then flipped the y axis,
   whereas the rasterizer flipped the y axis then added shift_y.
   Consistently flip-then-add in both places. This also makes the pattern
   of floors/ceils in GetGlyphBitmapBoxSubpixel simpler.
3. The rasterizer added shift_y after multiplying by the vertical
   oversampling factor, instead of before.

Vertical shifts now work much better, in my tests anyway.
 2014-09-17 22:54:16 -07:00
Sean Barrett dea604b896 add stb_image_resize 2014-09-17 07:11:56 -07:00
Sean Barrett 37faf29f69 Merge branch 'resample' 2014-09-17 07:10:40 -07:00
Sean Barrett 7c0ae19a42 documentation, release data 2014-09-17 07:10:21 -07:00
Sean Barrett 0fc13e997b optimization attempts, no meaningful changes 2014-09-17 06:24:40 -07:00
Sean Barrett 8024673461 switch srgb convert to second ryg method, which is a bit faster (8% total speedup on upsampling test); 
remove extra table in slowpath
 2014-09-17 06:07:16 -07:00
Jorge Rodriguez a12d3dedf0 Some todo notes. 2014-09-16 10:50:41 -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
Jorge Rodriguez 7602c99e77 Quick formatting fix. 2014-09-15 11:29:40 -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 bdbf1e0ef4 uint32 images need to round with uint32 cast, not int cast 2014-09-14 15:01:10 -07:00
Sean Barrett 9f66b441bd new quickstart docs; 
reformat docs;
new simple uint32 test
 2014-09-14 14:55:23 -07:00
Jorge Rodriguez 3c261481a6 Add a very quick guide. 2014-09-13 14:33:13 -07:00
Jorge Rodriguez f0ba7f5f7e Get rid of old perf tests. 2014-09-13 13:42:50 -07:00
Jorge Rodriguez a0d4f79074 Merge pull request #7 from nothings/resample 
Resample
 2014-09-13 12:31:18 -07:00
Sean Barrett 385d7a417c delete some unused functions; 
get rid of stbir__inline for some functions that don't need it
 2014-09-13 08:50:10 -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 8849501a3f add documentation explaining why even a 64K table for srgb_to_uint8 would be inaccurate 2014-09-13 08:21:14 -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 adbbe8dabd move x loop inside switch in horizontal_downsample 2014-09-13 07:46:09 -07:00
Sean Barrett 7a8c9196d1 unroll vertical_upsample inner loop, and reverse loop nesting to minimize work 2014-09-13 07:41:39 -07:00
Sean Barrett 9c2ae9bdb8 cache filter-width derived computations that use floor/ceil because those were showing up like crazy on VC6 profile despite only being per-scanline-ish?!? 
unroll inner loop in horizontal_resample
 2014-09-13 07:29:04 -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 3ee97c221f compile as C 2014-09-13 06:12:40 -07:00
Sean Barrett 59898db411 tweak grammar 2014-09-13 06:05:00 -07:00
Sean Barrett a2f1cadde8 convert tabs to spaces so it's consistent with other stb libs 2014-09-13 06:03:48 -07:00
Sean Barrett 60064f9803 add stb_image_resize.h to readme 2014-09-13 05:56:06 -07:00
Sean Barrett 0fa5b5c66f rename cubic to cubicbspline; 
tweak filter type documentation
 2014-09-13 05:52:19 -07:00
Ken Miller 316beb987d Merge branch 'master' of https://github.com/kennethdmiller3/stb 2014-09-13 00:38:04 -05:00
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 99f3b78bbd Merge branch 'resample' of http://github.com/bsvino/stb into resample 2014-09-12 03:54:17 -07:00
Sean Barrett df128b7995 update STBIR__UNUSED_PARAM to match stb_image.h version 2014-09-12 03:53:36 -07:00
Jorge Rodriguez ca88b6fba6 Calculate and store vertical contributors first so that they can be normalized and optimized. 2014-09-11 12:45:18 -07:00
Jorge Rodriguez a25c1d2bbd Merge remote-tracking branch 'remotes/nothings/resample' into resample 2014-09-11 10:00:57 -07:00
Jorge Rodriguez 36b417f6b4 Optimizations: Skip zero-coefficient contributions. Reduce the size of the coefficients array when downsampling. 2014-09-11 09:53:14 -07:00
Sean Barrett 27f26f8337 Documentation; 
rename STBIR_FLAG_PREMULTIPLED_ALPHA to STBIR_FLAG_ALPHA_PREMULTIPLIED so that both flags have "ALPHA" first
 2014-09-11 03:02:20 -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 793818d1af Skip zero-coefficient contributors, a fairly decent speedup. 2014-09-10 20:26:14 -07:00
Jorge Rodriguez 46dc8f84fb Use vertical pixel width for the ring buffer. 2014-09-10 20:12:38 -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