Method for processing graphics data by a graphic controller

摘要

In a drawing processing apparatus and a drawing processing method for superposing a plurality of graphics present on the same plane, a data format is previously extracted in a data format extraction control section. A write data extracting section converts write data from a DDA section into the extracted data format. A read data extracting section converts read data from a drawing frame memory into the extracted data format. A data comparing section compares the data format-converted write data from the write data extracting section with the data format-converted read data from the read data extracting section. When the two pieces of data are the same, a drawing output section omits a process of writing the write data form the DDA section into the drawing frame memory.