155 lines
4.5 KiB
Factor
Executable File
155 lines
4.5 KiB
Factor
Executable File
! Copyright (C) 2007 Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: alien arrays byte-arrays combinators summary io.backend
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graphics.viewer io io.binary io.files kernel libc math
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math.functions math.bitwise namespaces opengl opengl.gl
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prettyprint sequences strings ui ui.gadgets.panes
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io.encodings.binary accessors grouping ;
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IN: graphics.bitmap
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! Currently can only handle 24bit bitmaps.
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! Handles row-reversed bitmaps (their height is negative)
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TUPLE: bitmap magic size reserved offset header-length width
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height planes bit-count compression size-image
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x-pels y-pels color-used color-important rgb-quads color-index array ;
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: bgr>bitmap ( array height width -- bitmap )
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bitmap new
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2over * 3 * >>size-image
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swap >>height
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swap >>width
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swap [ >>array ] [ >>color-index ] bi
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24 >>bit-count ;
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: 8bit>array ( bitmap -- array )
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[ rgb-quads>> 4 <sliced-groups> [ 3 head-slice ] map ]
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[ color-index>> >array ] bi [ swap nth ] with map concat ;
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: 4bit>array ( bitmap -- array )
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[ rgb-quads>> 4 <sliced-groups> [ 3 head-slice ] map ]
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[ color-index>> >array ] bi [ swap nth ] with map concat ;
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: raw-bitmap>array ( bitmap -- array )
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dup bit-count>>
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{
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{ 32 [ "32bit" throw ] }
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{ 24 [ color-index>> ] }
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{ 16 [ "16bit" throw ] }
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{ 8 [ 8bit>array ] }
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{ 4 [ 4bit>array ] }
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{ 2 [ "2bit" throw ] }
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{ 1 [ "1bit" throw ] }
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} case >byte-array ;
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ERROR: bitmap-magic ;
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M: bitmap-magic summary
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drop "First two bytes of bitmap stream must be 'BM'" ;
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: parse-file-header ( bitmap -- )
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2 read >string dup "BM" = [ bitmap-magic ] unless >>magic
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4 read le> >>size
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4 read le> >>reserved
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4 read le> >>offset drop ;
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: parse-bitmap-header ( bitmap -- )
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4 read le> >>header-length
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4 read signed-le> >>width
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4 read signed-le> >>height
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2 read le> >>planes
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2 read le> >>bit-count
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4 read le> >>compression
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4 read le> >>size-image
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4 read le> >>x-pels
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4 read le> >>y-pels
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4 read le> >>color-used
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4 read le> >>color-important drop ;
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: rgb-quads-length ( bitmap -- n )
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[ offset>> 14 - ] keep header-length>> - ;
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: color-index-length ( bitmap -- n )
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[ width>> ] keep [ planes>> * ] keep
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[ bit-count>> * 31 + 32 /i 4 * ] keep
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height>> abs * ;
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: parse-bitmap ( bitmap -- )
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dup rgb-quads-length read >>rgb-quads
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dup color-index-length read >>color-index drop ;
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: load-bitmap ( path -- bitmap )
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normalize-path binary [
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bitmap new
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dup parse-file-header
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dup parse-bitmap-header
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dup parse-bitmap
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] with-file-reader
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dup raw-bitmap>array >>array ;
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: save-bitmap ( bitmap path -- )
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binary [
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"BM" >byte-array write
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dup array>> length 14 + 40 + 4 >le write
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0 4 >le write
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54 4 >le write
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40 4 >le write
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{
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[ width>> 4 >le write ]
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[ height>> 4 >le write ]
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[ planes>> 1 or 2 >le write ]
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[ bit-count>> 24 or 2 >le write ]
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[ compression>> 0 or 4 >le write ]
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[ size-image>> 4 >le write ]
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[ x-pels>> 0 or 4 >le write ]
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[ y-pels>> 0 or 4 >le write ]
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[ color-used>> 0 or 4 >le write ]
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[ color-important>> 0 or 4 >le write ]
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[ rgb-quads>> write ]
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[ color-index>> write ]
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} cleave
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] with-file-writer ;
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M: bitmap draw-image ( bitmap -- )
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dup height>> 0 < [
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0 0 glRasterPos2i
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1.0 -1.0 glPixelZoom
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] [
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0 over height>> abs glRasterPos2i
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1.0 1.0 glPixelZoom
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] if
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[ width>> ] keep
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[
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[ height>> abs ] keep
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bit-count>> {
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! { 32 [ GL_BGRA GL_UNSIGNED_INT_8_8_8_8 ] } ! broken
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{ 24 [ GL_BGR GL_UNSIGNED_BYTE ] }
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{ 8 [ GL_BGR GL_UNSIGNED_BYTE ] }
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{ 4 [ GL_BGR GL_UNSIGNED_BYTE ] }
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} case
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] keep array>> glDrawPixels ;
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M: bitmap width ( bitmap -- ) width>> ;
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M: bitmap height ( bitmap -- ) height>> ;
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: bitmap. ( path -- )
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load-bitmap <graphics-gadget> gadget. ;
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: bitmap-window ( path -- gadget )
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load-bitmap <graphics-gadget> [ "bitmap" open-window ] keep ;
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: test-bitmap24 ( -- )
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"resource:extra/graphics/bitmap/test-images/thiswayup24.bmp" bitmap. ;
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: test-bitmap8 ( -- )
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"resource:extra/graphics/bitmap/test-images/rgb8bit.bmp" bitmap. ;
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: test-bitmap4 ( -- )
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"resource:extra/graphics/bitmap/test-images/rgb4bit.bmp" bitmap. ;
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: test-bitmap1 ( -- )
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"resource:extra/graphics/bitmap/test-images/1bit.bmp" bitmap. ;
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