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Optimizing this image alpha clearing routine

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Hey, I've got an image in memory, whose alphachannel I need to set to 0. The image is laid out like : RGBA, totalling 4 bytes for a pixel. I need to leave the RGB untouched, and set the A part to 0. There must be a very fast way to do this, but I surely haven't found it yet: Lets hope these code tags work: <code> unsigned char *imagePtr = getImagePtr(); unsigned int padding = 0; imagePtr+=3; for (row=0;row!=myImageInfo.iHeight;row++) { for (column=0;column!= myImageInfo.iWidth;column++) { *imagePtr = 0; imagePtr+=4; } imagePtr += padding; } </code> Does anybody know where to find info on how to optimize these relativly lowlevel functions? Or a specific tip for this situation? Thanks, Lucas

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