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blit.r

REBOL [ Title: "Blit-r" Date: 17-Jan-2013 Version: 1.0.0 File: %blit.r Author: "Vincent Ecuyer" Purpose: {A simple 16 modes blitter function} Usage: { This 'blit function simulates a simple 16 modes blitter: blit destination brush mask op-mode performs the following logical operation on the destination image: (brush and mask) op-mode (destination and not mask) Where brush is: image! : an image smaller or of the same size that destination block! : a VID effect block in this format [size _pair!_ _effects sequence_] (example: [size 100x100 emboss colorize 255.0.255]) Mask is: none : no mask tuple! : bitplanes selection (red (or 255.0.0) = red only, white (or 255.255.255) = red + green + blue) image! : a mask to applies (M and ...) to the brush and destination block! : for faster operation, an image! and its precalculated complement (negative) in a block and Op-Mode is: (integer! or word!) 0000 - 0 - 'clear : clears destination (fills with black) 0001 - 1 - 'nor : brush nor destination 0010 - 2 - 'not-but : not brush but destination 0011 - 3 - 'invert-brush : not brush 0100 - 4 - 'but-not : brush but not destination 0101 - 5 - 'invert : not destination 0110 - 6 - 'xor : brush <> destination 0111 - 7 - 'nand : brush nand destination 1000 - 8 - 'and : brush and destination 1001 - 9 - 'iff : brush <=> destination 1010 - 10 - 'none : destination 1011 - 11 - 'imp : brush => destination 1100 - 12 - 'replace : brush 1101 - 13 - 'if : brush <= destination 1110 - 14 - 'or : brush or destination 1111 - 15 - 'fill : fills destination (fills with white) } Library: [ level: 'advanced platform: 'all type: [demo function] domain: [graphics] tested-under: [ view 2.7.8.2.5 on [Macintosh osx-x86] ] support: none license: 'apache-v2.0 see-also: none ] ] blit: func [ "Apply a blitter operation to an image. Returns saved area." image [image!] "Image to modify" brush [image! block!] "Brush or effect" mask [image! tuple! block! none!] "Mask, bitplanes or block of mask / not mask" mode [word! integer!] "Blitter mode: 0 to 15 or op name" /restore area [block! none!] "Restore a previous saved area." /local n ][ all [restore area foreach [offset data] area [change at head image offset data]] mode: either word? mode [ index? find [ clear nor not-but invert-brush but-not invert xor nand and iff none imp replace if or fill ] mode ][mode + 1] area: copy/part image brush/size mask: switch type?/word mask [ tuple! [reduce [ make image! reduce [brush/size mask] make image! reduce [brush/size 255.255.255 xor mask 255] ]] image! [reduce [ mask mask xor make image! reduce [brush/size 255.255.255] ]] none! [reduce [ make image! reduce [brush/size 255.255.255 255] make image! reduce [brush/size 0.0.0] ]] block! [mask] ] if block? brush [ layout compose [brush: image (area) effect next next brush] brush: to-image brush ] change image do pick [ [; 0 clear mask/2 and area ][; 1 nor (brush xor n: make image! reduce [brush/size 255.255.255]) and (area xor n) and mask/1 or (mask/2 and area) ][; 2 not-but brush xor mask/1 and area and mask/1 or (mask/2 and area) ][; 3 invert-brush brush xor mask/1 and mask/1 or (mask/2 and area) ][; 4 but-not area xor mask/1 and brush and mask/1 or (mask/2 and area) ][; 5 invert mask/1 xor area ][; 6 xor brush and mask/1 xor area ][; 7 nand brush xor mask/1 and mask/1 or (mask/1 xor area) ][; 8 and brush or mask/2 and area ][; 9 iff (brush xor make image! reduce [brush/size 255.255.255]) and mask/1 xor area ][; 10 none area ][; 11 imp brush xor mask/1 and mask/1 or area ][; 12 replace brush and mask/1 or (mask/2 and area) ][; 13 if brush and mask/1 or (mask/1 xor area) ][; 14 or brush and mask/1 or area ][; 15 fill mask/1 or area ] ] mode reduce [index? image area] ] ;Demo: right-click to change mode blit-demo: does [ ;Base image img: load http://www.rebol.com/view/demos/nyc.jpg ;Brush creation img3: copy/part img2: copy img 100x100 ;Mask creation layout [i: box img3/size white effect [oval]] i: to-image i i: reduce [i i xor make image! reduce [i/size 255.255.255]] s: none mode: 0 view layout [ backcolor rebolor image img2 rate 5 feel [ engage: func [f a e][ if find [over down] a [ s: blit/restore skip img2 img3/size / -2 + e/offset img3 i mode s show f ] if a = 'alt-down [ mode: mode + 1 // 16 mode-name/text: pick [ "0 clear" "1 brush nor image" "2 not-but" "3 invert brush" "4 but-not" "5 invert image" "6 brush xor image" "7 brush nand image" "8 brush and image" "9 brush <=> image" "10 none" "11 brush => image" "12 replace" "13 image => brush" "14 brush or image" "15 fill" ] mode + 1 show mode-name ] ] ] across vtext "Effect: " mode-name: vtext 200 "0 clear" ] ]
halt ;; to terminate script if DO'ne from webpage
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