Patent ID: 8847981

Claim:
A method for accumulative vector drawing using buffering, implemented by an apparatus for the accumulative vector drawing using the buffering, the method comprising: receiving a plurality of graphics commands; sequentially storing the plurality of graphics commands in a buffer; determining a valid definite drawing command that is temporally stored most recently in the buffer among the plurality of graphics commands; rendering, by a video unit having a graphics processor and a memory, the valid definite drawing command on a display, calculating a clipping area of the valid definite drawing command and reflecting the clipping area when rendering unrendered graphics commands, among the plurality of graphics commands, that are temporally stored in the buffer after the valid definite drawing command; and sequentially rendering the unrendered graphics commands temporally stored in the buffer after the valid definite drawing command on the display in an order in which the unrendered graphics commands temporally stored in the buffer after the valid definite drawing command were stored in the buffer, wherein the determining the valid definite drawing command comprises: determining whether an estimated exposed area of one of the plurality of graphics commands exceeds a predetermined threshold; if the estimated exposed area of the one of the plurality of graphics commands exceeds the predetermined threshold, determining whether the estimated exposed area covers all exposed areas of unrendered graphics commands temporally stored in the buffer after the one of the plurality of graphics commands; and if the estimated exposed area covers all exposed areas of the unrendered graphics commands temporally stored in the buffer after the one of the plurality of graphics commands, determining that the one of the plurality of graphics commands is the valid definite drawing command, and wherein the valid definite drawing command is a drawing command that definitely clips an area drawn under a figure drawn.