Patent ID: 6774904
Filing Date: 2004-08-10
Classification: G06F,G09G

Abstract:
A method for scanning video graphics data, comprising the acts of:(a) dividing a screen into a number of rows and columns of blocks, each of the blocks having contents; (b) scanning a first row of blocks to read the contents of each one of the blocks in the first row; (c) checking a first register to determine whether an indication of a change in the contents of a first block has been stored in the first register; (d) checking a second register to determine whether an indication of a change in the contents of a last block has been stored in the a second register; (e) if the respective indications have been stored in the respective first and second registers, scanning at least a portion of the blocks between the first block having changed contents and the last block having changed contents to read the contents of each one of the scanned blocks; (f) if the respective indications have not been stored in the respective first and second registers, scanning a successive row of blocks to read the contents of each one of the blocks in the successive row; and (g) repeating acts (c) through (f).