Chinmaya, You can roll your own BMP reading function(s) using the file format given here:
http://astronomy.swin.edu.au/~pbourke/dataformats/bmp/ http://www.javaworld.com/javatips/jw-javatip43_p.html You'll have to convert 24-bit images to Palm OS's hi-colour (565) format to take each byte as a percentage of 0x3f (6 bits) or 0x1f (5 bits) and bit shift, like R = (((RGB >> 16) & 0xff) * 0x1f >> 8) and you may also have to map 8-bit BMP palettes to Palm's system palette (or some other palette) by calculating each colour's relative difference using a colour distance function given below: http://www.compuphase.com/cmetric.htm I think you can get the system palette using the function WinPalette. It says in the Palm OS developer docs: "You can attach a custom color table to a bitmap, and if you do, the bitmap is drawn using that color table. However, this is a performance drain." So palette mapping speeds things up a bit. To speed up the colour mapping when you load an 8-bit image, you can create an index-lookup table, to map the BMP's palette indexes to indexes pointing to the closest matching colours in the target palette, using that colour distance function. It's then a case of setting the data for the Palm Bitmap, using BmpGetBits(BitmapType*), casting the void* to UInt8* or UInt16* depending on the colour depth and setting the values. A word of warning; if you attempt to use WinGetBitmap with WinCreateOffscreenWindow and nativeFormat, you may find your 565 data won't be in RGB format! I had a go on a Treo Sim and found it was in BGR (I think this is platform/device-specific) Hope that helps you. It's a start at least, if nothing else. Regards, David -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Chinmaya Sent: 20 January 2006 07:17 To: Palm Developer Forum Subject: Bitmap format Hi All Developers, I have a lot of basic queries on PalmOS, as I want to know a lot on it.Palm developers please help me and tell me the best answers to my questions , so that my basic fundas on Palm will be clear. I will send queries one by one in Palm Forum site. 1. I have a question on BMP format, i.e. "What's difference between Windows bitmap and Palmos bitmap?" If both are same then OK. As I know, both are not same(Bcoz, palmos bmp size is different from windows bmp format.). If both differ,then how palm converts the window bmp to a palm bmp ? Thanks in Advance!............. Regards, Chinmaya (India) -- For information on using the PalmSource Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/ -- For information on using the PalmSource Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
