| 摘要 |
PROBLEM TO BE SOLVED: To render a foreground object at a high speed so that a background image is rendered at a part where no foreground object is rendered. SOLUTION: It is determined whether the rasterization result of a rendering object is cashed. If it is determined that the rasterization result of the rendering object is not cashed, an image and a mask for the image are generated from the rendering object. The generated image and the generated mask are stored in a cache. If it is determined that the rasterization result of the rendering object is cached, an image and a mask are extracted from the cache. The extracted image is rendered on a portion of the extracted mask so that a background image remains on a portion other than the portion of the extracted mask. COPYRIGHT: (C)2009,JPO&INPIT |
