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<body class='hmmessage'><div style="text-align: left;">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.<br><br>For example if I was loading an RGBA image I am hoping to be able to make 4 separate RasterIO calls. <br><br>Assuming a BGRA image looks like:<br><br>0 - blue byte<br>
8 - green byte<br>
16 - red byte<br>
24 - alpha byte<br>
32 - blue byte<br>
40 - green byte<br>
48 - red byte<br>
56 - alpha byte<br>
64 - ....<br><br>The first RasterIO call would read in the blue values and insert them at 0, 32, 64, etc making it look like:<br><br>0 - blue byte<br>
8 - <br>
16 - <br>
24 - <br>
32 - blue byte<br>
40 - <br>
48 - <br>
56 - <br>
64 - ....<br><br>The second RasterIO call would read the green values and insert them at 8, 40, etc making it look like:<br><br>0 - blue byte<br>
8 - green byte<br>
16 - <br>
24 - <br>
32 - blue byte<br>
40 - green byte<br>
48 - <br>
56 - <br>
64 - ....<br><br>Rinse and repeat for red and alpha.<br><br>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.<br><br>Thanks for the help.<br><br>Craig<br><br> <br></div></body>
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