A method and system for rendering rectangle drawing objects are provided. For at least a first rectangle drawing object and a second rectangle drawing object, a determination is made if the second rectangle drawing object satisfies a predetermined condition with respect to the first rectangle drawing object. If the predetermined condition is satisfied, one-line raster image data associated with the second rectangle drawing object is generated and stored in a data buffer. The one-line raster image data indicates a filling color of the second rectangle drawing object over a first extent in a first direction. Subsequently, the one-line raster image data may be used a number of times over a second extent in a second direction perpendicular to the first direction to fill a drawing region corresponding to at least the second rectangle drawing object.

An image processing system for sequentially executing processes includes a process execution control apparatus to control an execution of the processes, and an image generation-output control apparatus to control an execution of image generation-output operation. The process execution control apparatus includes a control-side drawing information generator to generate drawing information to be referred when an image forming apparatus performs the image generation-output operation. The image generation-output control apparatus includes an output-side drawing information generator corresponding to the control-side drawing information generator. The control-side drawing information generator excludes an execution result of a designated process item from execution results of a plurality of process items, to be executed for generating the drawing information, to generate designated-information-excluded image information. When process contents of the designated process item is set at the image generation-output control apparatus, the output-side drawing information generator executes the plurality of process items based on the designated-information-excluded image information.