Add support for 'yank-media' on MS-Windows

Adds the capacity to handle types different from strings to the
clipboard management functions on MS-Windows, and some logic
required to convert media types names and content to be what
yank-media and the modes that use it expect (bug#71909).
* lisp/term/w32-win.el (w32--selection-target-translations): New
variable that holds the name translations for media types.
(w32--translate-selection-target): New function, translate the
name of a media type.
(w32--translate-reverse-selection-target): New function, reverse
translation.
(w32--get-selection): Modified to translate target names when
asked for targets, and retrieve media types when asked for them.
(w32--mime-type-textual-p): New function, checks if a MIME type
is textual.
* lisp/textmodes/sgml-mode.el (html-mode--image-yank-handler):
Fixed the image save mechanism, that added line feed characters
on MS-Windows, breaking binary formats.
* src/w32image.c (gdiplus_init): Modified to fetch more
functions fromm gdiplus.
(get_encoder_clsid): Renamed to 'w32_gdip_get_encoder_clsid'
and made nonstatic.
(gdiplus_startup): Renamed to 'w32_gdiplus_startup' and
made nonstatic.
* src/w32select.c (stdfmt_name): Made global, was static
function.
(convert_dibv5_to_png): New function to convert DIBV5 clipboard
format to PNG.
(get_clipboard_format_name): New function get the name of a
format given its index.
(Fw32__get_clipboard_data_media): New function, retrieves and
converts media content.
(syms_of_w32select): Export new lisp functions.
* src/w32gdiplus.h: New file, for definitions in w32image.c
* doc/lispref/frames.texi: Updated with MS-Windows support.
* etc/NEWS: Added entry about new feature.

1 files changed, 8 insertions, 8 deletions

diff --git a/doc/lispref/frames.texi b/doc/lispref/frames.texi
index 1b463eb51e5..bf4d5c05f3a 100644
--- a/doc/lispref/frames.texi
+++ b/doc/lispref/frames.texi
@@ -4759,14 +4759,14 @@ to encoding or decoding by any coding system.
 @section Yanking Media
 @cindex yank media from window-system selections
 
-  Data saved within window system selections is not restricted to
-plain text.  It is possible for selection data to encompass images or
-other binary data of the like, as well as rich text content instanced
-by HTML, and also PostScript.  Since the selection data types incident
-to this data are at variance with those for plain text, the insertion
-of such data is facilitated by a set of functions dubbed
-@dfn{yank-media handlers}, which are registered by each major mode
-undertaking its insertion and called where warranted upon the
+  Data saved within window system selections and the MS-Windows
+clipboard is not restricted to plain text.  It is possible for selection
+data to encompass images or other binary data of the like, as well as
+rich text content instanced by HTML, and also PostScript.  Since the
+selection data types incident to this data are at variance with those
+for plain text, the insertion of such data is facilitated by a set of
+functions dubbed @dfn{yank-media handlers}, which are registered by each
+major mode undertaking its insertion and called where warranted upon the
 execution of the @code{yank-media} command.
 
 @defun yank-media-handler types handler