Returns the known image formats.
graphics-ports
list-known-image-formats screen-spec &optional for-writing-too => formats
screen-spec⇩ |
A CAPI object, a plist, or nil . |
for-writing-too⇩ |
A generalized boolean. |
formats⇩ |
A list of keywords. |
The function list-known-image-formats
returns a list of keywords which specify known image formats.
screen-spec is an object that convert-to-screen can recognize, typically a pane or simply nil
.
If for-writing-too is not supplied or is nil
, then formats is a list of formats that can be loaded. All the formats in the list can be loaded, but on Cocoa and Windows the list is not exhaustive, and it may be possible to load formats that are not listed.
If for-writing-too is supplied as non-nil, then formats is a list of types that externalize-and-write-image can write. In this case the list is exhaustive on all platforms, and externalize-and-write-image can write a format if and only if it appears in the list.
All platforms (except Motif) can read and write :bmp
, :jpg
, :png
and :tiff
images, and also recognize :jpeg
as an alias for :jpg
, so the list will always include all of these keywords.
convert-to-screen
externalize-and-write-image
13 Drawing - Graphics Ports
CAPI User Guide and Reference Manual (Unix version) - 01 Dec 2021 19:33:02