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Portable Network Graphic  |  1997-07-26  |  144KB  |  816x1056  |  8-bit (256 colors)
Labels: book | bulletin board | earth | poster | reckoner | sidewalk | sky | windowpane
OCR: Barstiyh whysetear the bytes tha earen't visihled Whinisomy sensefubitiogt arogdrawing graphics inathe hidden area of VRAM, possibly to be scrolled onto the screen from the right. If each line IS only 640 bytes, why not just clear these visible bytes? Secondly if you op want to clear the whole VRAM, then why bother with screen lines? Of course we need to know the physical length of the VRAM but then, if we' re clearing all the bytes on each line its just one big block of memory All we need to op calculate the size of the VRAM divide 1 by four and then starting at the start, clear that number of longs. Even though this involves clearing the whole VRAM it may be faster than just clearing the visible portion of the lines Drawing lines. Before we got into clearing the screen we were talking ab ...