44 lines
1.6 KiB
Factor
44 lines
1.6 KiB
Factor
! Copyright (c) 2012 Anonymous
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! See http://factorcode.org/license.txt for BSD license.
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USING: arrays fry kernel math.matrices sequences ;
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IN: rosetta-code.bitmap
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! http://rosettacode.org/wiki/Basic_bitmap_storage
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! Show a basic storage type to handle a simple RGB raster
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! graphics image, and some primitive associated functions.
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! If possible provide a function to allocate an uninitialised
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! image, given its width and height, and provide 3 additional
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! functions:
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! * one to fill an image with a plain RGB color,
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! * one to set a given pixel with a color,
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! * one to get the color of a pixel.
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! (If there are specificities about the storage or the
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! allocation, explain those.)
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! Various utilities
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: meach ( matrix quot -- ) [ each ] curry each ; inline
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: meach-index ( matrix quot -- )
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[ swap 2array ] prepose
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[ curry each-index ] curry each-index ; inline
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: mmap ( matrix quot -- matrix' ) [ map ] curry map ; inline
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: mmap! ( matrix quot -- matrix' ) [ map! ] curry map! ; inline
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: mmap-index ( matrix quot -- matrix' )
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[ swap 2array ] prepose
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[ curry map-index ] curry map-index ; inline
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: matrix-dim ( matrix -- i j ) [ length ] [ first length ] bi ;
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: set-Mi,j ( elt {i,j} matrix -- ) [ first2 swap ] dip nth set-nth ;
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: Mi,j ( {i,j} matrix -- elt ) [ first2 swap ] dip nth nth ;
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! The storage functions
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: <raster-image> ( width height -- image )
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zero-matrix [ drop { 0 0 0 } ] mmap ;
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: fill-image ( {R,G,B} image -- image )
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swap '[ drop _ ] mmap! ;
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: set-pixel ( {R,G,B} {i,j} image -- ) set-Mi,j ; inline
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: get-pixel ( {i,j} image -- pixel ) Mi,j ; inline
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