Fast raster image process by detecting constant color lines in perpendicular direction

An image forming device, including one or more processors, and a non-transitory data storage storing computer-readable instructions that, when executed by the one or more processors, cause the image forming device to perform functions comprising:

• obtaining first raster line data as data of a first raster line including a plurality of pixels arranged in a first direction from raster data;
• generating raster line segment data as data of a raster line segment including a plurality of pixels arranged in a second direction perpendicular to the first direction from the received N number (N being an integer equal to or greater than 2) of the first raster lines;
• determining whether the plurality of pixels have an identical pixel value, the plurality of pixels constituting the raster line segment;
• encoding the raster line segment where the plurality of pixels have the identical pixel value;
• storing second raster line data as data of the second raster line including a plurality of pixels arranged in the second direction, the second raster line being produced by connecting the plurality of raster line segments;
• and
• rendering the second raster lines while decoding the encoded raster line segment.

A non-transitory computer-readable recording medium storing computer-readable instructions that, when executed by the one or more processors, cause an image forming device to execute:

• obtaining first raster line data as data of a first raster line including a plurality of pixels arranged in a first direction from raster data;
• generating raster line segment data as data of a raster line segment including a plurality of pixels arranged in a second direction perpendicular to the first direction from the received N number (N being an integer equal to or greater than 2) of the first raster lines;
• determining whether the plurality of pixels have an identical pixel value, the plurality of pixels constituting the raster line segment;
• encoding the raster line segment where the plurality of pixels have the identical pixel value;
• storing second raster line data as data of the second raster line including a plurality of pixels arranged in the second direction, the second raster line being produced by connecting the plurality of raster line segments;
• and
• rendering the second raster lines while decoding the encoded raster line segment.