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copied!<p>The Palm OS icon format is a variation of it's bitmap format. Palm OS supports a concept called bitmap families where multiple bitmaps of different color depths and pixel densities are bundled together, with the appropriate one chosen at runtime. An icon is just a bitmap stored in a 'tAIN' resource as part of the application. Bitmaps also can be compressed using either RLE or PackBits, an algorithm used in the original Mac OS.</p> <p>If you're using a tool like PilRC to compile your bitmaps, you should be sure to include a low density and a high density bitmap. Here's a sample icon definition that I've used in one of my own programs:</p> <pre><code>ICON BEGIN BITMAP "LargeSXSW06Icon_1bpp_72ppi__22x22.bmp" BPP 1 DENSITY 72 BITMAP "LargeSXSW06Icon_1bpp_144ppi_44x44.bmp" BPP 1 DENSITY 144 BITMAP "LargeSXSWIcon_8bpp_108ppi_33x33.bmp" BPP 8 COMPRESS TRANSPARENTINDEX 0 DENSITY 108 BITMAP "LargeSXSWIcon_8bpp_144ppi_44x44.bmp" BPP 8 COMPRESS TRANSPARENTINDEX 0 DENSITY 144 END SMALLICON BEGIN BITMAP "SmallIcon_1bpp_72ppi_15x9.bmp" BPP 1 DENSITY 72 BITMAP "SmallIcon_8bpp_72ppi_15x9.bmp" BPP 8 DENSITY 72 BITMAP "SmallSXSWIcon_8bpp_108ppi23x14.bmp" BPP 8 DENSITY 108 BITMAP "SmallSXSWIcon_8bpp_144ppi_30x18.bmp" BPP 8 DENSITY 144 END </code></pre> <p>I define two icons -- the standard large icon and a small icon that's used in the launcher in list view mode. The sizes are 22x22/44x44 for low and high density for the main icon, and 15x9/30x18 for the small icon. PilRC takes BMP files as input, but it outputs either .bin files for each resource or a combined PRC-format file with all the resources specified. The <a href="http://sourceforge.net/project/showfiles.php?group_id=7404" rel="nofollow noreferrer">PilRC source code</a> is the best reference to the actual binary format of the bitmap.</p>

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