bug#776: 22 carbon: mac-allow-anti-aliasing does not always work with bold fonts

bug#776: 22 carbon: mac-allow-anti-aliasing does not always work with bold fonts

[David Reitter]

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PS.: On my request, the user tested this with a more recent build as  
well (Aquamacs distro of 22, Carbon) and sent these two screenshots.
I cannot reproduce it: bold fonts, for me, look substantially different.


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Begin forwarded message:

From: Plipe Exty <explicit.type@gmail.com>
Date: 25 August 2008 08:47:17 EDT
To: aquamacs-bugs@aquamacs.org
Subject: [Aquamacs-bugs] Turning off anti-aliasing for bold fonts

With (setq mac-allow-anti-aliasing nil) I'm able to turn off anti- 
aliasing
for most fonts, except for bold ones. This results in ugly views where  
some
parts of the text are anti-aliased, and some aren't. I assume this is  
a bug,
unless there is a separate option to turn off anti-aliasing for bold  
fonts.

-exty

In GNU Emacs 22.2.50.2 (i386-apple-darwin9.2.2, Carbon Version 1.6.0)
of 2008-06-17 on plume.sr.unh.edu - Aquamacs Distribution 1.4
Windowing system distributor `Apple Inc.', version 10.5.4
configured using `configure  '--without-x' '--prefix=/usr/local''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  display-time-mode: t
  savehist-mode: t
  aquamacs-styles-mode: t
  smart-frame-positioning-mode: t
  recentf-mode: t
  encoded-kbd-mode: t
  osx-key-mode: t
  show-paren-mode: t
  delete-selection-mode: t
  pc-selection-mode: t
  cua-mode: t
  tooltip-mode: t
  tool-bar-mode: 0
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<vc-diff> <help-echo> C-x o C-n C-n C-p C-n v a r SPC
<help-echo> <down-mouse-1> <mouse-1> f d k s j C-x
v v v a r SPC c a r ; <return> C-x C-s C-x v + = <backspace>
= <backspace> C-x v = C-g C-x v = y C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p
C-p C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-p C-p C-p C-p C-p C-p C-p C-p C-p
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-x k <return> C-p C-p C-p C-p
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p
C-p C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n <switch-frame> C-x k <return>
<help-echo> C-x C-f c o n <tab> <return> <down-mouse-1>
<mouse-movement> <mouse-1> C-x C-f i n <tab> <tab>
<backspace> <backspace> <tab> <tab> m <backspace> c
<backspace> s c <tab> l <backspace> a l <tab> <return>
C-x k <return> <switch-frame> <help-echo> <help-echo>
<tool-bar> <customize> <help-echo> <wheel-down> <double-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <wheel-down>
<double-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-down> <wheel-up> <wheel-down>
<wheel-up> <help-echo> <help-echo> <switch-frame> <help-echo>
<help-echo> <help-echo> <help-echo> <switch-frame>
<switch-frame> <down-mouse-1> <mouse-movement> <mouse-1>
<down-mouse-1> <mouse-1> C-p / / C-x C-s C-n C-n C-n
<switch-frame> <down-mouse-1> <mouse-movement> <mouse-1>
<switch-frame> <menu-bar> <tools> <gdb> C-g <menu-bar>
<tools> <compile> C-g <menu-bar> <tools> <compile>
C-g <menu-bar> <help-menu> <send-emacs-bug-report>
<down-mouse-1> <mouse-movement> <mouse-1> C-x C-f <tab>
<tab> <help-echo> <menu-bar> <help-menu> <send-ema
cs-bug-report>

Recent messages:
Loading compile...done
Quit [2 times]
Loading emacsbug...done
Mark set
Sending...
Loading mailclient...done
Loading browse-url...done
Sending...done
Mark set
Making completion list...

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bug#776: 22 carbon: mac-allow-anti-aliasing does not always work with bold fonts

[YAMAMOTO Mitsuharu]

>>>>> On Mon, 25 Aug 2008 14:34:20 -0400, David Reitter <david.reitter@gmail.com> said:

> Begin forwarded message:

> From: Plipe Exty <explicit.type@gmail.com>
> Date: 25 August 2008 08:47:17 EDT
> To: aquamacs-bugs@aquamacs.org
> Subject: [Aquamacs-bugs] Turning off anti-aliasing for bold fonts

> With (setq mac-allow-anti-aliasing nil) I'm able to turn off anti-
> aliasing for most fonts, except for bold ones. This results in ugly
> views where some parts of the text are anti-aliased, and some
> aren't. I assume this is a bug, unless there is a separate option to
> turn off anti-aliasing for bold fonts.

That variable controls the selection of underlying text renderer
rather than anti-aliasing directly.  I've once suggested its renaming
at emacs-devel, but there was no response.

  http://lists.gnu.org/archive/html/emacs-devel/2006-04/msg01176.html

To control anti-aliasing, some description in Emacs Info (`Mac Font
Specs' node) might be useful.

     Mac OS X 10.2 or later can use two types of text renderings: Quartz
  2D (aka Core Graphics) and QuickDraw.  By default, Emacs uses the
  former on such versions.  It can be changed by setting
  `mac-allow-anti-aliasing' to `t' (Quartz 2D) or `nil' (QuickDraw).
  Both ATSUI and QuickDraw Text drawings are affected by the value of
  this variable.

     Appearance of text in small sizes will also be affected by the "Turn
  off text smoothing for font sizes N and smaller" setting in the General
  pane (Mac OS X 10.1 or 10.2) or in the Appearance pane (10.3 or later)
  of the System Preferences.  This threshold can alternatively be set
  just for Emacs (i.e., not as the system-wide setting) using the
  `defaults' command:

       defaults write org.gnu.Emacs AppleAntiAliasingThreshold N

Also, if you prefer overstriking bold by Emacs to synthetic bold by
ATSUI for Monaco for example, it can be specified as:

  (add-to-list 'face-ignored-fonts "\\`-[^-]*-monaco-bold-")

				     YAMAMOTO Mitsuharu
				mituharu@math.s.chiba-u.ac.jp

bug#776: 22 carbon: mac-allow-anti-aliasing does not always work with bold fonts

[Plipe Exty]

Thanks YAMAMOTO! A small change to your tip and it works in Aquamacs Emacs:

defaults write org.gnu.AquamacsEmacs AppleAntiAliasingThreshold N

David, I think this whole process should be explained in Aquamacs' help.

Cheers,
-exty

YAMAMOTO Mitsuharu wrote:
>>>>>> On Mon, 25 Aug 2008 14:34:20 -0400, David Reitter <david.reitter@gmail.com> said:
> 
>> Begin forwarded message:
> 
>> From: Plipe Exty <explicit.type@gmail.com>
>> Date: 25 August 2008 08:47:17 EDT
>> To: aquamacs-bugs@aquamacs.org
>> Subject: [Aquamacs-bugs] Turning off anti-aliasing for bold fonts
> 
>> With (setq mac-allow-anti-aliasing nil) I'm able to turn off anti-
>> aliasing for most fonts, except for bold ones. This results in ugly
>> views where some parts of the text are anti-aliased, and some
>> aren't. I assume this is a bug, unless there is a separate option to
>> turn off anti-aliasing for bold fonts.
> 
> That variable controls the selection of underlying text renderer
> rather than anti-aliasing directly.  I've once suggested its renaming
> at emacs-devel, but there was no response.
> 
>   http://lists.gnu.org/archive/html/emacs-devel/2006-04/msg01176.html
> 
> To control anti-aliasing, some description in Emacs Info (`Mac Font
> Specs' node) might be useful.
> 
>      Mac OS X 10.2 or later can use two types of text renderings: Quartz
>   2D (aka Core Graphics) and QuickDraw.  By default, Emacs uses the
>   former on such versions.  It can be changed by setting
>   `mac-allow-anti-aliasing' to `t' (Quartz 2D) or `nil' (QuickDraw).
>   Both ATSUI and QuickDraw Text drawings are affected by the value of
>   this variable.
> 
>      Appearance of text in small sizes will also be affected by the "Turn
>   off text smoothing for font sizes N and smaller" setting in the General
>   pane (Mac OS X 10.1 or 10.2) or in the Appearance pane (10.3 or later)
>   of the System Preferences.  This threshold can alternatively be set
>   just for Emacs (i.e., not as the system-wide setting) using the
>   `defaults' command:
> 
>        defaults write org.gnu.Emacs AppleAntiAliasingThreshold N
> 
> Also, if you prefer overstriking bold by Emacs to synthetic bold by
> ATSUI for Monaco for example, it can be specified as:
> 
>   (add-to-list 'face-ignored-fonts "\\`-[^-]*-monaco-bold-")
> 
> 				     YAMAMOTO Mitsuharu
> 				mituharu@math.s.chiba-u.ac.jp