Attached image contains a newline in the header after "RIFF" which the regexp in image-type-header-regexps fails to match. This makes create-image return nil for such an image when FILE-OR-DATA is DATA and DATA-P is non-nil.
004.webp
Description: image/webp
The following patch fixes the issue for me,
diff --git a/lisp/image.el b/lisp/image.el
index 29c39c5dd5..9221057bce 100644
--- a/lisp/image.el
+++ b/lisp/image.el
@@ -51,7 +51,7 @@ image-type-header-regexps
("\\`\\(?:MM\0\\*\\|II\\*\0\\)" . tiff)
("\\`[\t\n\r ]*%!PS" . postscript)
("\\`\xff\xd8" . jpeg) ; used to be (image-jpeg-p . jpeg)
- ("\\`RIFF....WEBPVP8" . webp)
+ ("\\`RIFF[^z-a][^z-a][^z-a][^z-a]WEBPVP8" . webp)
(,(let* ((incomment-re "\\(?:[^-]\\|-[^-]\\)")
(comment-re (concat "\\(?:!--" incomment-re "*-->[ \t\r\n]*<\\)")))
(concat "\\(?:<\\?xml[ \t\r\n]+[^>]*>\\)?[ \t\r\n]*<"
[ [^z-a] is documented in (info "(elisp) Regexp Special"). ]
In GNU Emacs 29.0.60 (build 2, x86_64-pc-linux-gnu, X toolkit, Xaw
scroll bars) of 2023-03-23 built on astatine
Repository revision: be8147c53f9dd2d896c27d5b32bf4f38b0af9b3f
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Debian GNU/Linux bookworm/sid
Configured using:
'configure --with-sound=alsa --with-x-toolkit=lucid --with-json
--without-xaw3d --without-gconf --without-libsystemd --without-cairo'
Configured features:
ACL DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XFT
XIM XINPUT2 XPM LUCID ZLIB
Important settings:
value of $LC_MONETARY: ta_IN.UTF-8
value of $LC_NUMERIC: ta_IN.UTF-8
value of $LANG: en_GB.UTF-8
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
hexl-follow-ascii: t
csv-field-index-mode: t
recentf-mode: t
shell-dirtrack-mode: t
server-mode: t
paredit-mode: t
eros-mode: t
flymake-mode: t
pdf-occur-global-minor-mode: t
minibuffer-depth-indicate-mode: t
repeat-mode: t
display-time-mode: t
display-battery-mode: t
delete-selection-mode: t
xterm-mouse-mode: t
straight-use-package-mode: t
straight-package-neutering-mode: t
tooltip-mode: t
global-eldoc-mode: t
eldoc-mode: t
show-paren-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
use-hard-newlines: t
tab-bar-history-mode: t
tab-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
undelete-frame-mode: t
transient-mark-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
abbrev-mode: t
Load-path shadows:
None found.
Features:
(ruler-mode hl-line hexl expand-region text-mode-expansions
cc-mode-expansions the-org-mode-expansions python-el-fgallina-expansions
er-basic-expansions expand-region-core ...)
Memory information:
((conses 16 5541494 789498)
(symbols 48 70186 141)
(strings 32 495814 72788)
(string-bytes 1 144111870)
(vectors 16 216791)
(vector-slots 8 4288415 706143)
(floats 8 37436 2621)
(intervals 56 497259 17293)
(buffers 976 448))
--- End Message ---