17e82a4080
Merge branch 'master' into working
ago%!(EXTRA string=11 years)
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.
ago%!(EXTRA string=11 years)
dea604b896
add stb_image_resize
ago%!(EXTRA string=11 years)
37faf29f69
Merge branch 'resample'
ago%!(EXTRA string=11 years)
7c0ae19a42
documentation, release data
ago%!(EXTRA string=11 years)
0fc13e997b
optimization attempts, no meaningful changes
ago%!(EXTRA string=11 years)
8024673461
switch srgb convert to second ryg method, which is a bit faster (8% total speedup on upsampling test);
...
remove extra table in slowpath
ago%!(EXTRA string=11 years)
a12d3dedf0
Some todo notes.
ago%!(EXTRA string=11 years)
cbf5ebbd35
Install ryg's float -> uint8 sRGB conversion code, which is much faster.
ago%!(EXTRA string=11 years)
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.
ago%!(EXTRA string=11 years)
7602c99e77
Quick formatting fix.
ago%!(EXTRA string=11 years)
dd28033b34
don't encode alpha channel twice when alpha is different colorspace from other channels
ago%!(EXTRA string=11 years)
bdbf1e0ef4
uint32 images need to round with uint32 cast, not int cast
ago%!(EXTRA string=11 years)
9f66b441bd
new quickstart docs;
...
reformat docs;
new simple uint32 test
ago%!(EXTRA string=11 years)
3c261481a6
Add a very quick guide.
ago%!(EXTRA string=11 years)
f0ba7f5f7e
Get rid of old perf tests.
ago%!(EXTRA string=11 years)
a0d4f79074
Merge pull request #7 from nothings/resample
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Resample
ago%!(EXTRA string=11 years)
385d7a417c
delete some unused functions;
...
get rid of stbir__inline for some functions that don't need it
ago%!(EXTRA string=11 years)
f711fdcb0f
disable performance test in test code, back to regression test path
ago%!(EXTRA string=11 years)
8849501a3f
add documentation explaining why even a 64K table for srgb_to_uint8 would be inaccurate
ago%!(EXTRA string=11 years)
9a6af9a8d3
replace int(floor()) with int(), since that produces same results for non-negative values and is much faster on 32-bit x86
ago%!(EXTRA string=11 years)
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
ago%!(EXTRA string=11 years)
adbbe8dabd
move x loop inside switch in horizontal_downsample
ago%!(EXTRA string=11 years)
7a8c9196d1
unroll vertical_upsample inner loop, and reverse loop nesting to minimize work
ago%!(EXTRA string=11 years)
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
ago%!(EXTRA string=11 years)
972456cb63
explicit performance tests variants
ago%!(EXTRA string=11 years)
c9600c012f
unroll channel loops in downsampler
ago%!(EXTRA string=11 years)
3ee97c221f
compile as C
ago%!(EXTRA string=11 years)
59898db411
tweak grammar
ago%!(EXTRA string=11 years)
a2f1cadde8
convert tabs to spaces so it's consistent with other stb libs
ago%!(EXTRA string=11 years)
60064f9803
add stb_image_resize.h to readme
ago%!(EXTRA string=11 years)
0fa5b5c66f
rename cubic to cubicbspline;
...
tweak filter type documentation
ago%!(EXTRA string=11 years)
316beb987d
Merge branch 'master' of https://github.com/kennethdmiller3/stb
ago%!(EXTRA string=11 years)
29b36b3dea
rename filters, document them
ago%!(EXTRA string=11 years)
da2aa8f6b7
checkboard test to verify srgb
ago%!(EXTRA string=11 years)
a9778b8dbd
tweak docs; fix compile error in UNUSED_PARAM stuff
ago%!(EXTRA string=11 years)
99f3b78bbd
Merge branch 'resample' of http://github.com/bsvino/stb into resample
ago%!(EXTRA string=11 years)
df128b7995
update STBIR__UNUSED_PARAM to match stb_image.h version
ago%!(EXTRA string=11 years)
ca88b6fba6
Calculate and store vertical contributors first so that they can be normalized and optimized.
ago%!(EXTRA string=11 years)
a25c1d2bbd
Merge remote-tracking branch 'remotes/nothings/resample' into resample
ago%!(EXTRA string=11 years)
36b417f6b4
Optimizations: Skip zero-coefficient contributions. Reduce the size of the coefficients array when downsampling.
ago%!(EXTRA string=11 years)
27f26f8337
Documentation;
...
rename STBIR_FLAG_PREMULTIPLED_ALPHA to STBIR_FLAG_ALPHA_PREMULTIPLIED so that both flags have "ALPHA" first
ago%!(EXTRA string=11 years)
7a4f1f4665
update with new tests for srgb conversion
ago%!(EXTRA string=11 years)
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
ago%!(EXTRA string=11 years)
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!;
ago%!(EXTRA string=11 years)
1208730e1e
Merge branch 'resample' of http://github.com/bsvino/stb into resample
ago%!(EXTRA string=11 years)
793818d1af
Skip zero-coefficient contributors, a fairly decent speedup.
ago%!(EXTRA string=11 years)
46dc8f84fb
Use vertical pixel width for the ring buffer.
ago%!(EXTRA string=11 years)
953a637841
Use a carefully shaped trapezoid instead of a box filter to avoid jumps between pixel values.
ago%!(EXTRA string=11 years)
671f04bd7e
debugging truetype crash
ago%!(EXTRA string=11 years)
Sean Barrett
Fabian Giesen
Jorge Rodriguez
Jorge Rodriguez
Ken Miller