103 lines
2.6 KiB
HTML
103 lines
2.6 KiB
HTML
<html>
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<head>
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<script>
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/*
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Convert a PNG into raw HGR bytes.
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Copyleft 2018 Michaelangel007
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Shell:
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python -m SimpleHTTPServer
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Web Browser:
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http://localhost:8000/pic2hgr.html
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*/
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function main()
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{
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var canvas = document.getElementById( 'canvas' );
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var context = canvas.getContext( '2d' );
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var w = canvas.width;
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var h = canvas.height;
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var pic = new Image();
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pic.onload = function()
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{
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context.drawImage( pic, 0, 0 );
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var data = context.getImageData( 0, 0, w, h );
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var texels = data.data;
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var addr;
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var byte = 0;
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var bit = 1;
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var line = "";
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var text = "";
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var cr = 0;
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var phase = 0;
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var hi = 0;
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// "Mr. Robot" -> "Mr. Crack"
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// X=$00 .. $0D (14 bytes)
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var y0 = 0;
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var y1 = 44;
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console.log( "image.size = " + texels.length );
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console.log( "image.w = " + pic.width );
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console.log( "image.h = " + pic.height );
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for( var y = y0; y < y1; y++ )
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{
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addr = 0x2000 + ((y/64)&63)*0x28 + (y%8)*0x400 + ((y/8)&7)*0x80;
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line = addr.toString( 16 ) + ":";
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cr = 0;
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phase = 0;
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for( var x = 0; x < 280; x++ )
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{
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j = (y*w + x)*4;
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r = texels[ j + 0 ];
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g = texels[ j + 1 ];
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b = texels[ j + 2 ];
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if( b >= 220 )
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byte |= bit;
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bit <<= 1;
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bit &= 0x7F;
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if( !bit ) // over-flow to next byte?
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{
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//hi = ((g > 232) && (b < g) && (r < g)) ? 0 : 0x80;
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hi = 0x80; // blue
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// hi = 0x00; // green
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line = line + (byte | hi).toString( 16 ) + ' ';
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cr++;
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if( cr % 8 === 0 )
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{
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addr += 8;
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if( cr < 0x28 )
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line = line + '\n' + addr.toString( 16 ) + ":";
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}
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byte = 0;
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bit = 1;
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}
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}
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text = text + line + '\n';
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}
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console.log( text );
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var log = document.getElementById( 'log' );
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log.innerHTML = text;
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};
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pic.src = 'mr_crack_and_his_crack_factory_280x192.png';
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}
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</script>
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</head>
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<body onload="main();">
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<canvas id='canvas' width="280" height="192"></canvas>
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<pre id='log'></pre>
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</body>
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</html>
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