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Re: Image transformations

From: Stefan Monnier
Subject: Re: Image transformations
Date: Tue, 25 Jun 2019 10:43:22 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

>> Part of the reason for my question above is to figure out if the
>> implementation of the API is likely to have such matrix inversion
>> code internally
> How can we possibly know for sure, on all supported platforms?

I'm not looking for "know for sure", just for a general understanding of
how things usually work.

>> (since it seems quite possible that sometimes one is
>> preferable and sometimes the other).
> I admit I don't see why we would have different preferences.

I'm asking about the other side of the API, i.e. not us but the
implementors of Cairo, etc...

It's really just out of curiosity, not directly related to what our code
should do: does the "inverse matrix" indicate that the Windows guys use
"fundamentally" different algorithms than the Cairo guys, or just that
inverting the matrix is considered "par for the course" because
sometimes you need one and sometimes you need the other.


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