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This is the trivial-thumbnail Reference Manual, version 1.1.0, generated automatically by Declt version 4.0 beta 2 "William Riker" on Mon Aug 15 06:04:35 2022 GMT+0.
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A tiny library to create thumbnails with ImageMagick. The binaries convert and mogrify need to be available on your system for this to work.
The main function to use is create.
(thumbnail:create #p"~/input.png" #p"~/input-thumb.png")
=> #p"~/input-thumb.png"
Of course it allows for different kinds of thumbnail generation with the crop argument:
(thumbnail:create #p"~/input.png" #p"~/input-thumb.png" :crop :WIDTH)
(thumbnail:create #p"~/input.png" #p"~/input-thumb.png" :crop :HEIGHT)
(thumbnail:create #p"~/input.png" #p"~/input-thumb.png" :crop T)
Using :WIDTH means that the image is first scaled down preserving the aspect ratio to fit into the given height and then crops the remaining width to fit the given width. :HEIGHT works similarly. T just crops the image without any scaling.
This library uses ImageMagick mostly because it can handle gif animations properly, which a lot of other tools cannot. Processing animation is calculation-intensive though, so if you want to disable that (resulting in a static gif), you can pass :preserve-gif NIL.
Trivial-Thumbnail attempts to locate the necessary binaries automatically, searching the usual paths such as /usr/bin, /usr/local/bin and C:/windows/system32/, C:/Program Files/ImageMagick*/. If it fails to find a suitable binary, it throws a warning at startup. When the binary is somewhere else, but still within your PATH, it should still work properly. Otherwise you will have to set *CONVERT-BIN* and *MOGRIFY-BIN* yourself.
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The main system appears first, followed by any subsystem dependency.
Tiny library to create image thumbnails with imagemagick.
Nicolas Hafner <shinmera@tymoon.eu>
Nicolas Hafner <shinmera@tymoon.eu>
(GIT https://github.com/Shinmera/trivial-thumbnail.git)
zlib
1.1.0
uiop (system).
thumbnail.lisp (file).
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Files are sorted by type and then listed depth-first from the systems components trees.
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trivial-thumbnail (system).
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trivial-thumbnail (system).
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Packages are listed by definition order.
common-lisp.
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Definitions are sorted by export status, category, package, and then by lexicographic order.
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String or pathname designating the location of the imagemagick CONVERT binary.
String or pathname designating the location of the imagemagick MOGRIFY binary.
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Runs imagemagick’s CONVERT on IN with the result to OUT using the command-line ARGS.
Creates a thumbnail of IN with the result to OUT.
IN — A pathname or string to the source image. Strings are parsed using
UIOP:PARSE-NATIVE-NAMESTRING.
OUT — A pathname or string to the source image or NIL. If NIL, OUT is the
same as IN, with ’thumb-’ prefixed to the pathname-name.
WIDTH — The width of the thumbnail in pixels.
HEIGHT — The height of the thumbnail in pixels.
CROP — How to create the thumbnail. Can be one of the following:
NIL Same as :CONTAIN
:CONTAIN Scale the image to fit the larger dimension.
:COVER Scale the image to fit the lower dimension, then crop.
:WIDTH Scale the image to HEIGHT and crop the width down to fit WIDTH.
:HEIGHT Scale the image to WIDTH and crop the height down to fit HEIGHT.
T Crop the image width and height to fit WIDTH and HEIGHT.
QUALITY — Percentage for the quality to use (0-100).
PRESERVE-GIF — Whether to run imagemagick with -coalesce, which preserves
GIF animations, but will take more time to compute.
IF-EXISTS — What to do if OUT exists. Can be one of the following:
NIL Don’t create a thumbnail and just return NIL.
:ERROR Signal an error.
:WARN Signal a warning.
:SUPERSEDE Overwrite the file.
Returns OUT.
Runs imagemagick’s MOGRIFY on IN using the command-line ARGS.
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Return a list of poissible alternative locations for the specified binary.
Iterates through the alternatives and, if one can be found by PROBE-FILE, sets the SYMBOL-VALUE of LABEL to that path. Otherwise signals a WARNING.
Wrapper around UIOP:RUN-PROGRAM that returns the string output of the command and
passes the argslist to UIOP:ESCAPE-COMMAND. Also accepts a pathname as the executable designator.
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