GNU bug report logs - #47040
27.1; PNG binary transparency is ignored

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Package: emacs; Reported by: ynyaaa@HIDDEN; Keywords: moreinfo; dated Wed, 10 Mar 2021 10:47:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Eli Zaretskii <eliz@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
In-Reply-To: <87czw7jbgq.fsf@HIDDEN> (message from Lars Ingebrigtsen on Wed, 
 10 Mar 2021 16:05:25 +0100)
Subject: Re: bug#47040: 27.1; PNG binary transparency is ignored
References: <86o8fr1e3d.fsf@HIDDEN> <87czw7jbgq.fsf@HIDDEN>
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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Date: Wed, 10 Mar 2021 16:05:25 +0100
> Cc: 47040 <at> debbugs.gnu.org
> 
> > Red pixels in the both images have 0 for alpha value, so they should be
> > transparent and invisible, but transparent1.png is displayed as a red
> > square with a green frame in a emacs buffer.
> >
> > transparent2.png is displayed as a white square with a green frame as
> > expected.
> >
> > When they are displayed in a chrome browser, inner squares of the both
> > images are displayed as transparent.
> 
> I'm unable to reproduce this in Emacs 27.1 in Debian/bullseye, so this
> may be a Windows-specific problem.  It may also be fixed in Emacs 28,
> since the transparency code has gotten a lot of work.  Would it be
> possible for you to check in Emacs 28 whether this problem is still
> present there?
> 
> If not, can somebody else with Windows and Emacs 28 check whether the
> problem is still present?

The problem is still present when using the default libpng, but not if
I use the w32 native image API.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#47040; Package emacs. Full text available.
Added tag(s) moreinfo. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: ynyaaa@HIDDEN
Subject: Re: bug#47040: 27.1; PNG binary transparency is ignored
References: <86o8fr1e3d.fsf@HIDDEN>
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Date: Wed, 10 Mar 2021 16:05:25 +0100
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 Content preview: ynyaaa@HIDDEN writes: > Red pixels in the both images have
 0 for alpha value, so they should be > transparent and invisible,
 but transparent1.png
 is displayed as a red > square with a green frame in a emacs buffer. > >
 tra [...] 
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ynyaaa@HIDDEN writes:

> Red pixels in the both images have 0 for alpha value, so they should be
> transparent and invisible, but transparent1.png is displayed as a red
> square with a green frame in a emacs buffer.
>
> transparent2.png is displayed as a white square with a green frame as
> expected.
>
> When they are displayed in a chrome browser, inner squares of the both
> images are displayed as transparent.

I'm unable to reproduce this in Emacs 27.1 in Debian/bullseye, so this
may be a Windows-specific problem.  It may also be fixed in Emacs 28,
since the transparency code has gotten a lot of work.  Would it be
possible for you to check in Emacs 28 whether this problem is still
present there?

If not, can somebody else with Windows and Emacs 28 check whether the
problem is still present?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#47040; Package emacs. Full text available.

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From: ynyaaa@HIDDEN
To: bug-gnu-emacs@HIDDEN
Subject: 27.1; PNG binary transparency is ignored
Date: Wed, 10 Mar 2021 19:45:58 +0900
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--=-=-=
Content-Type: text/plain


If a PNG file has a aplpha plain composeed of only 0 or 255,
its transparency is ignored.

The attached file transparent1.png is a red sqaure framed with a green
line, where red pixels have 0 for alpha value and green pixels have 255
for alpha value.
transparent2.png is a similar image, but the alpha values for green
pixels are 254.

Red pixels in the both images have 0 for alpha value, so they should be
transparent and invisible, but transparent1.png is displayed as a red
square with a green frame in a emacs buffer.

transparent2.png is displayed as a white square with a green frame as
expected.

When they are displayed in a chrome browser, inner squares of the both
images are displayed as transparent.


--=-=-=
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Content-Disposition: attachment; filename=transparent1.png
Content-Transfer-Encoding: base64

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--=-=-=
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Content-Disposition: attachment; filename=transparent2.png
Content-Transfer-Encoding: base64

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--=-=-=
Content-Type: text/plain



In GNU Emacs 27.1 (build 1, x86_64-w64-mingw32)
 of 2020-08-22 built on CIRROCUMULUS
Repository revision: 86d8d76aa36037184db0b2897c434cdaab1a9ae8
Repository branch: HEAD
Windowing system distributor 'Microsoft Corp.', version 10.0.18363
System Description: Microsoft Windows 10 Pro (v10.0.1909.18363.1379)

Recent messages:

Configured using:
 'configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static''

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY W32NOTIFY ACL GNUTLS LIBXML2
HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS MODULES THREADS JSON 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:
(mule-util eieio-opt cl-extra speedbar sb-image ezimage dframe apropos
image-mode exif dired-aux gnutls network-stream nsm mailalias smtpmail
auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs json map
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 help-fns radix-tree cl-print debug
backtrace help-mode easymenu find-func cl-loaddefs cl-lib term/bobcat
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 81166 41710)
 (symbols 48 9599 0)
 (strings 32 27679 2980)
 (string-bytes 1 803013)
 (vectors 16 15294)
 (vector-slots 8 285442 20934)
 (floats 8 48 289)
 (intervals 56 1355 1190)
 (buffers 1000 28))

--=-=-=--




Acknowledgement sent to ynyaaa@HIDDEN:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#47040; Package emacs. Full text available.
Please note: This is a static page, with minimal formatting, updated once a day.
Click here to see this page with the latest information and nicer formatting.
Last modified: Wed, 10 Mar 2021 15:30:02 UTC

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