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bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS
From: |
Po Lu |
Subject: |
bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS |
Date: |
Fri, 15 Jul 2022 16:23:09 +0800 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.91 (gnu/linux) |
Gerd Möllmann <gerd.moellmann@gmail.com> writes:
> If we insert the max values for x, y, w, h in the original, we have
>
> int byte = (12 - 1) * (16/8 + (16%8 != 0 ? 1 : 0) + (16 - 1)/8
>
> which is
>
> = 11 * (2 + (0 ? 1 : 0) + 15/8
> = 11 * 2 + 1
> = 23
>
> which would be the right /byte/ to access in the bitmap. But
> "bits[byte]" doesn't access the 23rd byte of the bitmap but the 23rd
> unsigned short, which is byte 46 and 47. That cannot possibly be
> right, or?
Yes, you're right here. I think that code does want to access the
individual bytes.
> The NSBezierPath stuff I don't know. I gather, from a short look at
> the docs, that one can "record" stuff that should be drawn in such an
> object. The path can then later be used to actually draw. Looks a
> tad complicated to me to draw single pixels as a rectangle of size 1,
> but what do I know...
Believe it or not, it's the only way to record such a pixel without
resulting in annoying scaling artifacts from the OS trying to scale the
image up to monitor resolution.
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/14
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Eli Zaretskii, 2022/07/14
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/14
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/14
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Eli Zaretskii, 2022/07/14
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/14
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS,
Po Lu <=
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Eli Zaretskii, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Robert Pluim, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Eli Zaretskii, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Andreas Schwab, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/16
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Andreas Schwab, 2022/07/15