49d411a3d1
- also for excluding some things in the build, as I may not need to support PCBoard at revision. Actually, I don't. Later I can add that support, but for now, I need the Revision bits working.
117 lines
3.5 KiB
CoffeeScript
117 lines
3.5 KiB
CoffeeScript
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class @ImageTextModeXBin extends @ImageTextMode
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# Header constants
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PALETTE = 1
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FONT = 2
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COMPRESSED = 4
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NON_BLINK = 8
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FIVETWELVE_CHARS = 16
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# Compression type constants
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NO_COMPRESSION = 0
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CHARACTER_COMPRESSION = 64
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ATTRIBUTE_COMPRESSION = 128
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FULL_COMPRESSION = 192
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# Compression byte constants
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COMPRESSION_TYPE = 192
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COMPRESSION_COUNTER = 63
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constructor: ( options ) ->
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super
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@header = { width: 0, height: 0, fontisze: 0, flags: 0 }
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this[k] = v for own k, v of options
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parse: ( content ) ->
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@screen = []
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headerData = content.substr( 0, 11 )
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if headerData.length isnt 11 || !headerData.match( '^XBIN\x1a' )
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throw new Error( 'File is not an XBin' )
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@header.width = @unpackShort( headerData.substr( 5, 2 ) )
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@header.height = @unpackShort( headerData.substr( 7, 2 ) )
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@header.fontsize = @getByteAt( headerData.substr( 9, 1 ) )
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@header.flags = @getByteAt( headerData.substr( 10, 1 ) )
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offset = 11
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if @header.flags & PALETTE
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@parsePaletteData( content.substr( offset, 48 ) );
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offset += 48
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if @header.flags & FONT
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fontlength = @header.fontsize
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if @header.flags & FIVETWELVE_CHARS
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fontlength *= 512
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else
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fontlength *= 256
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@parseFontData( content.substr( offset, fontlength ), @header.fontsize );
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offset += fontlength
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if @header.flags & COMPRESSED
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@_parse_compressed( content.substr( offset ) )
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else
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@_parse_uncompressed( content.substr( offset ) )
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_parse_compressed: ( data ) ->
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x = 0
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y = 0
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@screen[ y ] = []
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data = data.split( '' )
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while info = data.shift()
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info = @getByteAt( info, 0 )
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break if info == 26
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type = info & COMPRESSION_TYPE
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counter = ( info & COMPRESSION_COUNTER ) + 1
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ch = null
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attr = null
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while counter-- > 0
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switch type
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when NO_COMPRESSION
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ch = data.shift()
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attr = data.shift()
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when CHARACTER_COMPRESSION
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ch = data.shift() if !ch?
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attr = data.shift()
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when ATTRIBUTE_COMPRESSION
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attr = data.shift() if !attr?
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ch = data.shift()
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else
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ch = data.shift() if !ch?
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attr = data.shift() if !attr?
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@screen[ y ][ x ] = { ch: ch, attr: @getByteAt( attr, 0 ) }
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x++
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if x == @header.width
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x = 0
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y++
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break if y == @header.height
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@screen[ y ] = [] if !@screen[ y ]?
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_parse_uncompressed: ( data ) ->
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x = 0
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y = 0
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@screen[ y ] = []
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for i in [ 0 .. data.length - 2 ] by 2
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ch = data.substr( i, 1 )
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break if ch == "\x1a"
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attr = @getByteAt( data, i + 1 )
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@screen[ y ][ x ] = { 'ch': ch, 'attr': attr }
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x++
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if x == @header.width
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x = 0
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y++
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break if y == @header.height
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@screen[ y ] = [] if !@screen[ y ]?
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getWidth: ->
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return @header.width
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getHeight: ->
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return @header.height
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