116 lines
4 KiB
CoffeeScript
116 lines
4 KiB
CoffeeScript
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class @ImageTextMode
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@VERSION = '0.01'
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constructor: ( options ) ->
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@screen = []
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@palette = new ImageTextModePaletteVGA()
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@font = new ImageTextModeFont8x16()
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@[k] = v for own k, v of options
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parseUrl: ( url ) ->
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req = new XMLHttpRequest()
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req.open 'GET', url, false
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req.overrideMimeType 'text/plain; charset=x-user-defined'
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req.send null
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content = if req.status is 200 or req.status is 0 then req.responseText else ''
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@parse content
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unpackShort: ( data ) ->
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shrt = ( @getByteAt( data, 1 ) << 8 ) + @getByteAt( data, 0 )
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if shrt < 0
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shrt += 65536
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shrt
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unpackLong: ( data ) ->
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lng = ((( @getByteAt( data, 0 ) << 8 ) + @getByteAt( data, 1 ) << 8 ) + @getByteAt( data, 2 ) << 8 ) + @getByteAt( data, 3 )
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if lng < 0
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lng += 4294967296
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lng
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getByteAt: ( data, offset ) ->
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data.charCodeAt( offset ) & 0xFF
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# could we replace this with math.max ? Not worth it,called once per view
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# we COULD, but we'd do some crap like "Math.max.apply(null,blah) and that's not readable"
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getWidth: ->
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max = 0
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for y in [ 0 .. @screen.length - 1 ]
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max = @screen[ y ].length if @screen[ y ]? && @screen[ y ].length > max
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max
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getHeight: ->
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@screen.length
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parsePaletteData: ( data ) ->
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colors = []
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for i in [ 0 .. 45 ] by 3
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r = @getByteAt( data, i )
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r = r << 2 | r >> 4
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g = @getByteAt( data, i + 1 )
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g = g << 2 | g >> 4
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b = @getByteAt( data, i + 2 )
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b = b << 2 | b >> 4
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colors.push [ r, g, b ]
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@palette = new ImageTextModePalette( colors: colors )
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parseFontData: ( data, height = 16 ) ->
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chars = []
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for i in [ 0 ... data.length / height ]
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chr = []
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for j in [ 0 ... height ]
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chr.push @getByteAt( data, i * height + j )
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chars.push chr
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@font = new ImageTextModeFont( { chars: chars, height: height } )
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# the majority of time is spent in this routine
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# list comprehension seems to speed up from 1.8 seconds to 1.29 seconds from first comprehension / cleanup?
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renderCanvas: ( canvasElem ) ->
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w = @getWidth() * @font.width
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h = @getHeight() * @font.height
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canvas = document.createElement 'canvas'
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canvas.setAttribute 'width', w
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canvas.setAttribute 'height', h
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ctx = canvas.getContext '2d'
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for cy in [ 0 ... @screen.length ]
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if @screen[ cy ]?
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for cx in [ 0 ... @screen[ cy ].length ]
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pixel = @screen[ cy ][ cx ]
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curfillstyle = null
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if pixel?
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if pixel.attr?
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fg = pixel.attr & 15
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bg = ( pixel.attr & 240 ) >> 4
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else
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fg = pixel.fg
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bg = pixel.bg
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px = cx * @font.width
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py = cy * @font.height
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ctx.fillStyle = @palette.toRgbaString( @palette.colors[ bg ] )
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ctx.fillRect px, py, @font.width, @font.height
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ctx.fillStyle = @palette.toRgbaString( @palette.colors[ fg ] )
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chr = @font.chars[ pixel.ch.charCodeAt( 0 ) & 0xff ]
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i = 0
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for line in chr
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ctx.fillRect px + j, py + i, 1, 1 for j in [ 0 ... @font.width ] when line & (1 << @font.width - 1 - j )
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i += 1
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canvasElem.setAttribute 'width', w
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canvasElem.setAttribute 'height', h
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ctx = canvasElem.getContext '2d'
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ctx.drawImage canvas, 0, 0
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toBinaryArray: (str) ->
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buf = new ArrayBuffer(str.length * 2) # 2 bytes for each char
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bufView = new Uint8Array(buf)
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bufView[i] = str.charCodeAt(i) for i in [0...str.length]
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buf
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