From: Eli Zaretskii <eliz@gnu.org>
To: Alan Third <alan@idiocy.org>
Cc: emacs-devel@gnu.org
Subject: Re: Image transformations
Date: Thu, 13 Jun 2019 20:11:21 +0300 [thread overview]
Message-ID: <83d0jhz9za.fsf@gnu.org> (raw)
In-Reply-To: <20190613165804.GB11266@breton.holly.idiocy.org> (message from Alan Third on Thu, 13 Jun 2019 17:58:04 +0100)
> Date: Thu, 13 Jun 2019 17:58:04 +0100
> From: Alan Third <alan@idiocy.org>
> Cc: emacs-devel@gnu.org
>
> 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.
next prev parent reply other threads:[~2019-06-13 17:11 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-11 5:10 Image transformations Eli Zaretskii
2019-06-11 20:02 ` Alan Third
2019-06-12 15:30 ` Eli Zaretskii
2019-06-12 22:07 ` Alan Third
2019-06-12 22:15 ` Alan Third
2019-06-13 4:16 ` Alp Aker
2019-06-13 5:41 ` Eli Zaretskii
2019-06-13 9:19 ` Alp Aker
2019-06-13 13:05 ` Eli Zaretskii
2019-06-13 15:57 ` Alp Aker
2019-06-13 16:20 ` Eli Zaretskii
2019-06-13 19:00 ` Richard Copley
2019-06-13 19:29 ` Eli Zaretskii
2019-06-14 10:45 ` Alp Aker
2019-06-14 10:55 ` Richard Copley
2019-06-14 11:45 ` YAMAMOTO Mitsuharu
2019-06-14 11:59 ` Alp Aker
2019-06-13 16:12 ` Alan Third
2019-06-13 17:05 ` Eli Zaretskii
2019-06-13 19:35 ` Richard Copley
2019-06-13 5:48 ` Eli Zaretskii
2019-06-13 16:58 ` Alan Third
2019-06-13 17:11 ` Eli Zaretskii [this message]
2019-06-13 19:27 ` Alan Third
2019-06-13 19:39 ` Alan Third
2019-06-13 19:47 ` Eli Zaretskii
2019-06-13 22:26 ` Alan Third
2019-06-14 7:05 ` Eli Zaretskii
2019-06-14 9:57 ` Stefan Monnier
2019-06-14 10:57 ` Eli Zaretskii
2019-06-14 11:21 ` Richard Copley
2019-06-14 12:06 ` Eli Zaretskii
2019-06-14 12:49 ` Richard Copley
2019-06-14 14:16 ` Yuri Khan
2019-06-14 14:43 ` Eli Zaretskii
2019-06-14 15:55 ` Richard Copley
2019-06-15 11:00 ` Alan Third
2019-06-15 11:34 ` Eli Zaretskii
2019-06-15 10:42 ` Alan Third
2019-06-15 11:31 ` Eli Zaretskii
2019-06-16 15:22 ` Alan Third
2019-06-16 16:34 ` Eli Zaretskii
2019-06-17 21:13 ` Alan Third
2019-06-19 17:56 ` Eli Zaretskii
2019-06-24 17:54 ` Eli Zaretskii
2019-06-24 19:50 ` Stefan Monnier
2019-06-25 2:33 ` Eli Zaretskii
2019-06-25 3:28 ` Stefan Monnier
2019-06-25 4:34 ` Eli Zaretskii
2019-06-25 14:43 ` Stefan Monnier
2019-06-25 15:35 ` Eli Zaretskii
2019-06-26 0:28 ` YAMAMOTO Mitsuharu
2019-06-26 15:34 ` Eli Zaretskii
2019-06-27 3:37 ` YAMAMOTO Mitsuharu
2019-06-27 13:13 ` Eli Zaretskii
2019-06-25 18:33 ` Alan Third
2019-06-25 18:57 ` Eli Zaretskii
2019-06-27 13:59 ` Eli Zaretskii
2019-06-28 18:36 ` Alan Third
2019-06-28 19:50 ` Eli Zaretskii
2019-06-29 11:55 ` Eli Zaretskii
2019-06-29 19:51 ` Alan Third
2019-06-29 19:49 ` Alan Third
2019-06-29 19:53 ` Lars Ingebrigtsen
2019-06-30 14:38 ` Alan Third
2019-06-30 15:24 ` Lars Ingebrigtsen
2019-07-25 19:40 ` Lars Ingebrigtsen
2019-07-26 6:10 ` Eli Zaretskii
2019-07-26 6:46 ` Lars Ingebrigtsen
2019-07-26 8:06 ` Eli Zaretskii
2019-07-26 8:23 ` Lars Ingebrigtsen
2019-07-26 8:24 ` Lars Ingebrigtsen
2019-07-26 8:33 ` Eli Zaretskii
2019-07-26 8:58 ` Lars Ingebrigtsen
2019-07-26 9:13 ` Eli Zaretskii
2019-07-26 10:23 ` Lars Ingebrigtsen
2019-07-26 14:08 ` Stefan Monnier
2019-07-26 8:32 ` Eli Zaretskii
2019-06-29 21:05 ` Stefan Monnier
2019-06-30 15:12 ` Eli Zaretskii
2019-06-30 19:10 ` Alan Third
2019-07-01 14:55 ` Eli Zaretskii
2019-06-18 11:01 ` Tak Kunihiro
2019-06-13 17:41 ` Eli Zaretskii
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=83d0jhz9za.fsf@gnu.org \
--to=eliz@gnu.org \
--cc=alan@idiocy.org \
--cc=emacs-devel@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.