jsbmp - JavaScript Bitmap Generator
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Create Windows bitmap (.BMP) files with JavaScript.

Please note that this is not a high-level image composition library: included functions do little more than pack raw pixel data.

It supports 24-bit uncompressed (BI_RGB):

    // 5x1 pixel progression from black to light grey
    var greys = bmp_rgb(5, 1, ['000000','333333', '666666', '999999', 'cccccc']);

And 8-bit run-length encoded (BI_RLE8):

    // 2000x2 pixel line, blue on top and red below
    var bluelineredline = bmp_rle8(2000, 2, [['0000FF', 2000], ['FF0000', 2000]]);

Cool Examples
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 * [A Mario sprite generated from X PixMap v2 text data](xpm2.html)
 * [A tiled background with dynamic size and colours](bg.html)

Compatibility
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Tested with Firefox 3.0.11, Internet Explorer 8 and Safari version something.

Please note that, although version 8 finally adds `data` URI support to Internet Explorer, it is limited to URIs 32,000-odd characters long. (Consider that one pixel in an uncompressed bitmap takes up 4+ bytes, for a maximum base64-encoded size of ~80x80.)

Sources
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Bitmap generation:

 * [jsbmp.js](jsbmp.js)

Supporting files:

* [datauri.js](datauri.js) - generate `data` URIs
* [xpm2.js](xpm2.js) - parse XPM v2 text

Extra:

* [jsbmpblock.js](jsbmpblock.js) - has one function, `block(width, height, colour)`, which is more or less a minified/optimized `bmp_rle8()`. Firefox only; [demo](block2.html).