Patent ID: 7830393
Filing Date: 2010-11-09
Classification: G06T

Abstract:
1. A rectangular image drawing device configured to write brightness data of a background color into an address region in an image memory assigned to a first rectangular region on a screen other than an overlap between the first rectangular region and a second rectangular region, and write brightness data of a rectangular image into an address region of the image memory assigned to the second rectangular region, the rectangular image drawing device comprising: a computing unit configured to calculate the number of background-color pixels to be added to the rectangular image in the transverse direction on the basis of the amount of a transverse shift from the first rectangular region to the second rectangular region; and a writing unit configured to write brightness data of both the background-color pixels and the rectangular image into each line of the image memory simultaneously or successively, wherein the writing unit is configured to use burst transfer in writing, and if the amount of data to be written falls within a single burst unit, the writing unit writes the data simultaneously, and if the amount of data to be written extends over more than one burst unit, the writing unit writes the data successively.