handle ushort-component pngs, throw errors on adam7 interlaced pngs for now
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7c01c09f21
commit
8dff4776c6
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@ -26,6 +26,9 @@ CONSTANT: indexed-color 3
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CONSTANT: greyscale-alpha 4
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CONSTANT: truecolor-alpha 6
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CONSTANT: interlace-none 0
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CONSTANT: interlace-adam7 1
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: <loading-png> ( -- image )
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loading-png new
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V{ } clone >>chunks ;
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@ -86,8 +89,8 @@ ERROR: unimplemented-color-type image ;
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: png-bytes-per-pixel ( loading-png -- n )
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dup color-type>> {
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{ 2 [ scale-bit-depth 3 * ] }
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{ 6 [ scale-bit-depth 4 * ] }
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{ truecolor [ scale-bit-depth 3 * ] }
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{ truecolor-alpha [ scale-bit-depth 4 * ] }
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[ unknown-color-type ]
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} case ; inline
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@ -118,20 +121,41 @@ ERROR: unimplemented-color-type image ;
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lines dup first length 0 <array> prefix
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[ n 1 - 0 <array> prepend ] map
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2 clump [
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n swap first2 [ ] [ n 1 - swap nth ] [ [ 0 n 1 - ] dip set-nth ] tri
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n swap first2
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[ ]
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[ n 1 - swap nth ]
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[ [ 0 n 1 - ] dip set-nth ] tri
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png-unfilter-line
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] map B{ } concat-as ;
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ERROR: unimplemented-interlace ;
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: reverse-interlace ( byte-array loading-png -- byte-array )
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{
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{ interlace-none [ ] }
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{ interlace-adam7 [ unimplemented-interlace ] }
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[ unimplemented-interlace ]
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} case ;
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: png-image-bytes ( loading-png -- byte-array )
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[ png-bytes-per-pixel ]
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[ inflate-data ]
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[ [ inflate-data ] [ interlace-method>> ] bi reverse-interlace ]
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[ png-group-width ] tri group reverse-png-filter ;
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ERROR: unknown-component-type n ;
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: png-component ( loading-png -- obj )
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bit-depth>> {
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{ 8 [ ubyte-components ] }
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{ 16 [ ushort-components ] }
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[ unknown-component-type ]
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} case ;
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: loading-png>image ( loading-png -- image )
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[ image new ] dip {
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[ png-image-bytes >>bitmap ]
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[ [ width>> ] [ height>> ] bi 2array >>dim ]
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[ drop ubyte-components >>component-type ]
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[ png-component >>component-type ]
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} cleave ;
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: decode-greyscale ( loading-png -- image )
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