I have a BGRA buffer in memory, and a multi-band RGBA TIF image. Is it possible to use RasterIO to read in values from each band and neatly interleave them in my buffer.
For example if I was loading an RGBA image I am hoping to be able to make 4 separate RasterIO calls. Assuming a BGRA image looks like: 0 - blue byte 8 - green byte 16 - red byte 24 - alpha byte 32 - blue byte 40 - green byte 48 - red byte 56 - alpha byte 64 - .... The first RasterIO call would read in the blue values and insert them at 0, 32, 64, etc making it look like: 0 - blue byte 8 - 16 - 24 - 32 - blue byte 40 - 48 - 56 - 64 - .... The second RasterIO call would read the green values and insert them at 8, 40, etc making it look like: 0 - blue byte 8 - green byte 16 - 24 - 32 - blue byte 40 - green byte 48 - 56 - 64 - .... Rinse and repeat for red and alpha. Is this possible, or is there a much much simpler way that I'm overlooking? I've been looking at the paramaters for RasterIO but can't seem to get it to work. I do understand that I can just read the values into a separate buffer and memcpy them over to my image buffer. I was trying to minimize the total number of times the same data has to be copied. Thanks for the help. Craig
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