bug#39736: closed (27.0.60; wrong display of scaled checkerd pattern image)

[GNU bug Tracking System]

Your message dated Tue, 4 Aug 2020 21:51:34 +0200 (CEST)
with message-id <20200804195130.GA5470@breton.holly.idiocy.org>
and subject line Re: bug#38394: Fwd: Use different image filtering when zooming 
in vs zooming out
has caused the debbugs.gnu.org bug report #38394,
regarding 27.0.60; wrong display of scaled checkerd pattern image
to be marked as done.

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help-debbugs@gnu.org.)


-- 
38394: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=38394
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> --- Begin Message ---
>
>
>
> Subject: 
>
> 27.0.60; wrong display of scaled checkerd pattern image
>
>
>
>
> Date: 
>
> Sat, 22 Feb 2020 23:26:54 +0900
>
>
>
>
> A scaled checkered pattern image is converted into a solid gray image.
> I expect a large chechered pattern.
> Evaluating the form below, a solid gray square is displayed.
>
> (let ((data "\
> P1
> 8 8
> 01010101
> 10101010
> 01010101
> 10101010
> 01010101
> 10101010
> 01010101
> 10101010
> "))
>   (insert-image (create-image data 'pbm t :scale 8)))
>
> The form below temporally displays another image.
> The upper side is gray, the lower-left corner is black,
> and the lower-right corner is white.
> Once the text cursor gets on the image, the whole image is displayed as
> a gray square.
>
> (let ((data "P1\n2 2\n01\n10")
>       (buf (generate-new-buffer "tmp")))
>   (switch-to-buffer buf)
>   (insert "\na")
>   (goto-char (point-min))
>   (redisplay)
>   (insert-image (create-image data 'pbm t :scale 16)))
>
>
> In GNU Emacs 27.0.60 (build 1, x86_64-w64-mingw32)
>  of 2019-12-29 built on CIRROCUMULUS
> Repository revision: 21c3020fcec0a32122d2680a391864a75393031b
> Repository branch: emacs-27
> Windowing system distributor 'Microsoft Corp.', version 10.0.18363
> System Description: Microsoft Windows 10 Pro (v10.0.1909.18363.657)
>
> Recent messages:
>
> Configured using:
>  'configure --without-dbus --host=x86_64-w64-mingw32
>  --without-compress-install -C 'CFLAGS=-O2 -static -g3''
>
> Configured features:
> XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY W32NOTIFY ACL GNUTLS LIBXML2
> HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS MODULES THREADS PDUMPER LCMS2 GMP
>
> Important settings:
>   value of $LANG: JPN
>   locale-coding-system: cp932
>
> Major mode: Lisp Interaction
>
> Minor modes in effect:
>   tooltip-mode: t
>   global-eldoc-mode: t
>   eldoc-mode: t
>   electric-indent-mode: t
>   mouse-wheel-mode: t
>   tool-bar-mode: t
>   menu-bar-mode: t
>   file-name-shadow-mode: t
>   global-font-lock-mode: t
>   font-lock-mode: t
>   blink-cursor-mode: t
>   auto-composition-mode: t
>   auto-encryption-mode: t
>   auto-compression-mode: t
>   line-number-mode: t
>   transient-mark-mode: t
>
> Load-path shadows:
> None found.
>
> Features:
> (thingatpt xref project ring gnutls network-stream nsm mailalias
> smtpmail auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs json
> map cl-extra misearch multi-isearch pp shadow sort mail-extr emacsbug
> message rmc puny dired dired-loaddefs format-spec rfc822 mml mml-sec
> password-cache epa derived epg epg-config gnus-util rmail rmail-loaddefs
> text-property-search time-date subr-x seq byte-opt gv bytecomp
> byte-compile cconv mm-decode mm-bodies mm-encode mail-parse rfc2231
> mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
> mm-util mail-prsvr mail-utils term/bobcat help-fns radix-tree cl-print
> debug backtrace help-mode easymenu find-func cl-loaddefs cl-lib
> japan-util tooltip eldoc electric uniquify ediff-hook vc-hooks
> lisp-float-type mwheel dos-w32 ls-lisp disp-table term/w32-win w32-win
> w32-vars term/common-win tool-bar dnd fontset image regexp-opt fringe
> tabulated-list replace newcomment text-mode elisp-mode lisp-mode
> prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer
> select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
> term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang
> misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
> cp51932 hebrew greek romanian slovak czech european ethiopic indian
> cyrillic chinese composite charscript charprop case-table epa-hook
> jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs
> button faces cus-face macroexp files text-properties overlay sha1 md5
> base64 format env code-pages mule custom widget hashtable-print-readable
> backquote threads w32notify w32 lcms2 multi-tty make-network-process
> emacs)
>
> Memory information:
> ((conses 16 69135 12815)
>  (symbols 48 7851 5)
>  (strings 32 22941 1828)
>  (string-bytes 1 729921)
>  (vectors 16 15072)
>  (vector-slots 8 259276 24684)
>  (floats 8 37 321)
>  (intervals 56 709 0)
>  (buffers 1000 18))
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#38394: Fwd: Use different image filtering when zooming in vs zooming out
>
>
>
>
> Date: 
>
> Tue, 4 Aug 2020 21:51:34 +0200 (CEST)
>
>
>
>
> On Tue, Aug 04, 2020 at 10:52:47AM +0200, Lars Ingebrigtsen wrote:
> > Alan Third <alan@idiocy.org> writes:
> > 
> > > It should be possible, I just don't know how. I've never done any
> > > Cairo work before...
> > >
> > > Turned out to be pretty simple. Patch attached.
> > 
> > Then I think this should be applied to Emacs 28, and we'll get some
> > feedback on whether people prefer it this way or not.
>
> I worked out how to do it under NS too, so I've added that and pushed
> to master.
> -- 
> Alan Third
>
>
> --- End Message ---