137 lines
3.9 KiB
Factor
Executable File
137 lines
3.9 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
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io.backend graphics.viewer io io.binary io.files kernel libc
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math math.functions namespaces opengl opengl.gl prettyprint
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sequences strings ui ui.gadgets.panes io.encodings.binary
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accessors ;
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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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: raw-bitmap>string ( str n -- str )
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{
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{ 32 [ "32bit" throw ] }
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{ 24 [ ] }
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{ 16 [ "16bit" throw ] }
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{ 8 [ "8bit" throw ] }
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{ 4 [ "4bit" throw ] }
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{ 2 [ "2bit" throw ] }
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{ 1 [ "1bit" throw ] }
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} case ;
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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 le> >>width
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4 read 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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T{ bitmap } clone
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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 color-index>> over bit-count>>
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raw-bitmap>string >byte-array >>array ;
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: save-bitmap ( bitmap path -- )
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binary [
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"BM" 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>> 4 >le write ]
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[ y-pels>> 4 >le write ]
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[ color-used>> 4 >le write ]
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[ color-important>> 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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} 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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