application/octet-stream
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2.69 KB
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83 lines
;; Contains some functions for working with image data
;;
;; Should only contain some basic functions, as well as some
;; functions which can then be extended via modules, like the
;; generic functions image/save! and image/load! which by default
;; will probably only every support BMP files.
;;
;; Some simple drawing routines (line/box/circle) and some simple
;; filters (scale/blur) would also be good to have here.
[def image/decoders @[]]
[def image/encoders @[]]
[defn image/add-encoder! [ext enc]
[def ext [string->keyword [lowercase ext]]]
[tree/set! image/encoders ext enc]]
[defn image/add-decoder! [ext dec]
[def ext [string->keyword [lowercase ext]]]
[tree/set! image/decoders ext dec]]
[defn image/get-encoder [path]
[def ext [string->keyword [lowercase [path/extension path]]]]
[tree/ref image/encoders ext]]
[defn image/get-decoder [path]
[def ext [string->keyword [lowercase [path/extension path]]]]
[tree/ref image/decoders ext]]
[defn image/new [width height]
[def buffer [buffer/allocate [* width height 4]]]
@[ :width width
:height height
:pixel-buffer buffer
:pixels [buffer/view/u32* buffer]]]
[defn image/ref [img x y]
[def i [+ [int x] [* [int y] [tree/ref img :width]]]]
[buffer/view/ref [tree/ref img :pixels] i]]
[defn image/set! [img x y value]
[def i [+ [int x] [* [int y] [tree/ref img :width]]]]
[buffer/view/set! [tree/ref img :pixels] i value]]
[defn image/fill! [img value]
[def p [tree/ref img :pixels]]
[for [i 0 [* [tree/ref img :width]
[tree/ref img :height]]]
[buffer/view/set! p i value]]
[return img]]
[defn image/map! [img fun]
[def p [tree/ref img :pixels]]
[for [i 0 [* [tree/ref img :width]
[tree/ref img :height]]]
[buffer/view/set! p i [fun [buffer/view/ref p i]]]]
[return img]]
[defn image/dup [img]
[def ret [image/new [tree/ref img :width]
[tree/ref img :height]]]
[def in [tree/ref img :pixels]]
[def out [tree/ref ret :pixels]]
[for [i 0 [* [tree/ref img :width]
[tree/ref img :height]]]
[buffer/view/set! out i [buffer/view/ref in i]]]
[return ret]]
[defn image/save! [img path]
[def enc [image/get-encoder path]]
[if enc
[file/write [enc img] path]
[exception :missing-encoder "Currently there is no encoder loaded for that image format" path]]]
[defn image/test []
[def w 256]
[def h 256]
[def out [image/new w h]]
[for [x 0 w]
[for [y 0 h]
[image/set! out x y [logior x [ash y 8] [ash [logxor x y] 16]]]]]
[return out]]
