Have you tried something like this? var pixelPos:int = col + row * totalCols; // or x + y * width buffer.position = pixelPos * 4; // each pixel takes 32 bits ==> 4 bytes var pixelValue:uint = buffer.readUnsignedInt();
Or, if the order is column-major (but I don't think it is) var pixelPos:int = row + col * totalRows; // or y + x * height buffer.position = pixelPos * 4; // each pixel takes 32 bits ==> 4 bytes var pixelValue:uint = buffer.readUnsignedInt(); Cheers Juan Pablo Califano 2009/3/17, Jiri <[email protected]>: > > Seems that the encoder use the BitmapData.getPixel(). So that doesnt give > me the insight I am hoping for :( > > J. > > Romuald Quantin wrote: > >> I guess you need some kind of specification, how the bytes for a >> bitmapdata are created and stored. >> >> I have no idea if you can find that. >> >> Basically they're doing that in the JPGEncoder andPNGEncoder? >> >> You might want to see what they're doing to get some details about what is >> stored and where. >> >> >> http://code.google.com/p/as3corelib/source/browse/trunk/src/com/adobe/images/JPGEncoder.as >> >> http://code.google.com/p/as3corelib/source/browse/trunk/src/com/adobe/images/PNGEncoder.as >> >> Romu >> >> Jiri wrote: >> >>> Hello, >>> >>> I have a BitmapData and use the draw() method to add sprite data. Then I >>> get the ByteArray through the BitmapData.getPixels() method. This byteArray >>> is compressed and cached. >>> >>> Then when i need it, i decompress the ByteArray and use the >>> BitmapData.setPixels() and add all that to a new Bitmap() >>> >>> Next I use the Bitmap.getPixel(MouseX , MouseY) to check if the pixel is >>> white or not. White meaning I cannot 'walk' there. >>> >>> My question is, can I skip the adding of the ByteArray to the Bitmap and >>> directly access the value corresponding to the x and y in the ByteArray. >>> >>> This would probably save me some computation time. >>> >>> How are the bytes stored, is it a multi dimensional array and if so, what >>> is the colum size? >>> >>> Thank you, >>> >>> Jiri >>> >>> _______________________________________________ >>> Flashcoders mailing list >>> [email protected] >>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >>> >>> >> _______________________________________________ >> Flashcoders mailing list >> [email protected] >> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >> >> _______________________________________________ > Flashcoders mailing list > [email protected] > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > _______________________________________________ Flashcoders mailing list [email protected] http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
