The magic of pointers

Our friend, Mr. Smith, has progressed a lot from his first steps in Delphi. Now he is playing with graphics. He wants to build a virtual reality app that would allow you to walk through the Antarctica forests. While he's getting some success, he has problems displaying the correct colors on the screen.

A part of his code is producing textures in Blue-Green-Red (BGR) byte order, while the graphics driver needs them in the more standard Red-Green-Blue (RGB) order. He already wrote some code to fix this problem, but his solution is a bit too slow. He'd like to push a frame or two more from the system and so I promised that I'd help him optimize the converter. I'd be glad to do it, as his problem neatly fits into the story ...

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