Buffer format for GETIMAGE & PUTIMAGE

[andrew_4619]

I have an application that does some image rendering that was written a long time ago using quickwin under digital visual fortran. I recently bought Composer XE.

The app. renders the image and writes to a window on a pixel by pixel basis using SETPIXELRGB. This is works OK but is slow. Under DVF I had a utility to write to a buffer and then draw the buffer with PUTIMAGE which is fast.

The format of the buffer has changed it used to have 2bytes for the row width , 2 bytes for the number of rows and then pixel colour values on a row by row basis.

Now if I use IMAGESIZE the buffer is ROWS*COLUMNS*4 + 54 bytes long. Please could I have the information on the structure of this buffer. It looks to me likes bytes 19-22 are width and 23-26 are height and the pixel info. starts at bytes 55 but it will be rather difficult & time consuming to reverse engineer.

Thanks in advance
Andrew

[andrew_4619]

Having looked a bit harder is looks like a device independant bitmap with the 14 byte bitmap header folled by a 40 byte DIB header.

Is this format fixed within the Quickwin application or will it change dependant on the hardware the application is being run on?