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Sean Barrett 2014-09-17 07:10:21 -07:00
parent 0fc13e997b
commit 7c0ae19a42
1 changed files with 12 additions and 9 deletions
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stb_image_resize.h
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@ -5,6 +5,7 @@
Written with emphasis on usability, portability, and efficiency. (No
SIMD or threads, so it be easily outperformed by libs that use those.)
Only scaling and translation is supported, no rotations or shears.
Easy API downsamples w/Mitchell filter, upsamples w/cubic interpolation.
COMPILING & LINKING
In one C/C++ file that #includes this file, do this:
@ -29,6 +30,15 @@
ADDITIONAL DOCUMENTATION
SRGB & FLOATING POINT REPRESENTATION
Some srgb-related code in this library relies on floats being 32-bit
IEEE floating point, and relies on a specific bitpacking order of C
bitfields. If you are on a system that uses non-IEEE floats or packs
C bitfields in the opposite order, then you can use a slower fallback
codepath by defining STBIR_NON_IEEE_FLOAT. (We didn't make this choice
idly; using mostly-but-not-100%-portable-code for this is a massive
speedup, especially upsampling where colorspace conversion dominates.)
MEMORY ALLOCATION
The resize functions here perform a single memory allocation using
malloc. To control the memory allocation, before the #include that
@ -146,18 +156,11 @@
(For example, graphics hardware does not apply sRGB conversion
to the alpha channel.)
IEEE FLOAT OPTIMIZATIONS
Some optimizations in this library make use of IEEE floating point
numbers. If you are on a system that uses non-IEEE floats then you can
disable these optimizations and use a somewhat slower fallback with
#define STBIR_NON_IEEE_FLOAT
ADDITIONAL CONTRIBUTORS
Sean Barrett: API design, optimizations
REVISIONS
0.90 (2014-??-??) first released version
0.90 (2014-09-17) first released version
LICENSE
This software is in the public domain. Where that dedication is not
@ -167,7 +170,7 @@
TODO
Don't decode all of the image data when only processing a partial tile
Don't use full-width decode buffers when only processing a partial tile
When doing huge upscaling, break scanlines into smaller blocks that fit in L1 cache
When processing wide images, break processing into tiles so data fits in L1 cache
Installable filters?
Resize that respects alpha test coverage
(Reference code: FloatImage::alphaTestCoverage and FloatImage::scaleAlphaToCoverage: