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Re: Image transformations
From: |
Eli Zaretskii |
Subject: |
Re: Image transformations |
Date: |
Thu, 13 Jun 2019 20:11:21 +0300 |
> Date: Thu, 13 Jun 2019 17:58:04 +0100
> From: Alan Third <address@hidden>
> Cc: address@hidden
>
> Can you point me to the Windows API documentation and perhaps I can
> work out how exactly we need to approach this?
I want to use PlgBlt, see
https://docs.microsoft.com/en-us/windows/desktop/api/wingdi/nf-wingdi-plgblt
For that, I need to compute, for each of the original image's
vertices, the coordinates of the corresponding vertex of the
transformed image. That's why I was asking how to interpret the
matrix elements for transforming pixel coordinates.
I also want to know when no rotation is involved, so that I could use
the existing code (which only supports scaling and will be modified to
support cropping) on older Windows versions that cannot support
rotations (PlgBlt is not available on those platforms).
Thanks.
- Re: Image transformations, (continued)
- Re: Image transformations, Eli Zaretskii, 2019/06/13
- Re: Image transformations, Alp Aker, 2019/06/14
- Re: Image transformations, Richard Copley, 2019/06/14
- Re: Image transformations, YAMAMOTO Mitsuharu, 2019/06/14
- Re: Image transformations, Alp Aker, 2019/06/14
- Re: Image transformations, Alan Third, 2019/06/13
- Re: Image transformations, Eli Zaretskii, 2019/06/13
- Re: Image transformations, Richard Copley, 2019/06/13
- Re: Image transformations, Eli Zaretskii, 2019/06/13
- Re: Image transformations, Alan Third, 2019/06/13
- Re: Image transformations,
Eli Zaretskii <=
- Re: Image transformations, Alan Third, 2019/06/13
- Re: Image transformations, Eli Zaretskii, 2019/06/13
- Re: Image transformations, Alan Third, 2019/06/13
- Re: Image transformations, Eli Zaretskii, 2019/06/14
- Re: Image transformations, Stefan Monnier, 2019/06/14
- Re: Image transformations, Eli Zaretskii, 2019/06/14
- Re: Image transformations, Richard Copley, 2019/06/14
- Re: Image transformations, Eli Zaretskii, 2019/06/14
- Re: Image transformations, Richard Copley, 2019/06/14
- Re: Image transformations, Yuri Khan, 2019/06/14