Parallel fast drawing of unrotated delta row encoded images

A computing device, comprising:

• L (L is two or more) processors;
• and
• a non-transitory data storage storing computer-readable instructions that, when executed by the L processors, cause the computing device to perform functions comprising:
• receiving image data encoded by delta row encoding, the image data indicating two dimensionally arranged plurality of pixels, the image data including delta data indicating difference between Nth row line and (N−1)th row line in the two dimensionally arranged plurality of pixels;
• dividing the two dimensionally arranged plurality of pixels by M (M equals to L or less) in a column direction to make M blocks of pixels including the first block to Mth block;
• assigning M processers to perform a parallel processing of accumulating the delta data for all the row lines of each of the M blocks of the image data to obtain the accumulated delta data, the accumulated delta data including a total delta between the first row line and the last row line in each of the blocks;
• obtaining the first row lines in the respective blocks using the total delta one by one starting from the second block;
• assigning M+1 processers to perform a parallel processing of decoding using the obtained first row lines to obtain the decoded data;
• and
• assigning M+1 processers to perform a parallel processing of rendering the image data using the decoded data.

A non-transitory computer-readable recording medium storing computer-readable instructions that, when executed by L (L is two or more) processors, cause a computing device to execute:

• receiving image data encoded by delta row encoding, the image data indicating two dimensionally arranged plurality of pixels, the image data including delta data indicating difference between Nth row line and (N−1)th row line in the two dimensionally arranged plurality of pixels;
• dividing the two dimensionally arranged plurality of pixels by M (M equals to L or less) in a column direction to make M blocks of pixels including the first block to Mth block;
• assigning M processers to perform a parallel processing of accumulating the delta data for all the row lines of each of the M blocks of the image data to obtain the accumulated delta data, the accumulated delta data including a total delta between the first row line and the last row line in each of the blocks;
• obtaining the first row lines in the respective blocks using the total delta one by one starting from the second block;
• assigning M+1 processers to perform a parallel processing of decoding using the obtained first row lines to obtain the decoded data;
• and
• assigning M+1 processers to perform a parallel processing of rendering the image data using the decoded data.