Add bitmapfilter.blend #8859
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Add bitmapfilter.blend #8859
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This can perform arbitrary channel mixing between two images. Alpha blend & maximum functions are demonstrated in the test. However, it should make most of the usual photo editing blends possible. (for dissolve, fill a mask bitmap with random values, which may be expensive to do from circuitpython code; we can specifically accelerate it if we need to)
I've identified that this is a bottleneck when I am refining documentation; by returning a bare minimum of data to allow the doc build to complete, I can do more builds in less time. To use, `env NO_BINDINGS_MATRIX= make html`
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Along with some pure Python functions to build the 4096-entry look up table, this should allow most photo editing layer blend modes to be implemented.
This is a almost a superset of
bitmaptools.alphablendexcept that only RGB565_SWAPPED is supported and instead of having a skip index there is an optional mask bitmap; we should decide what to do about this. Part of that would include benchmarking the alternatives.