r8

• Switch to VapourSynth API V4
• Add an AviSynth+ plugin (API V8 required)
• Add custom kernels (Functionality is about the same as in AkarinVS's fork, but it's implemented in a different way internally) (VapourSynth plugin only)
• Add force/force_h/force_v parameter to force sampling even if the resolution stays the same (VapourSynth plugin only)

Custom kernels usage example:

# Debilinear
core.descale.Descale(src, w, h, custom_kernel=lambda x: 1.0 - x, taps=1)

# Delanczos
import math
def sinc(x):
    return 1.0 if x == 0 else math.sin(x * math.pi) / (x * math.pi)
taps = 3
core.descale.Descale(src, w, h, custom_kernel=lambda x: sinc(x) * sinc(x / taps), taps=taps)

r7

• Support all constant input formats (internally clips are converted to float before processing and converted back to their original format afterwards; all subsamplings are supported, but for now, left-aligned chroma is always assumed; the python wrapper is now only needed if you don't want to descale chroma)
• Add a generic Descale filter that takes a string kernel parameter to make it simpler to write wrapper functions
• Add opt parameter to manually select optimizations
• Split the code for the VapourSynth plugin and descale
• Change license to MIT

r6

• Fix memory leak
• Fix potential array bound violation

Hopefully, this is the last bugfix release for a while.

r5

• Statically link libwinpthread instead of libpthread on Windows

Identical to r4 for other platforms than Windows.

r4

• Lazily generate matrices and do decomposition inside get_frame, to make use of the VS thread pool when multiple descale instances are called (Users of getnative.py benefit greatly from this)
• Fixed rounding on the pixel grid for negative values (Could affect some left/top pixels, but visible difference is probably next to non-existent)

r3

• Restructured the vertical pass to be less stupid with a much better memory access pattern
• Added AVX2 optimizations
• The defaults for Debicubic are now b=0.0 and c=0.5 to be consistent with the new defaults of VapourSynth's resizer
• Added Despline64

r2

• Fixed a bug in the python wrapper of Debicubic that caused c to always equal b
• Added native support for YUV444PS and RGBS to the plugin
• Added some sanity checks

Cross-compiled with gcc for Windows.

r1

Cross-compiled with gcc for Windows with statically linked libgcc, libstdc++, and libwinpthread.