| 摘要 |
<p>It is determined whether the rasterization result of a rendering object (3902) is cashed. If it is determined that the rasterization result of the rendering object is not cashed, an image (3904) and a mask (3905) 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.</p> |
