Systems, methods and devices for rotating image tiles using line segment read buffers

A method for operating a device, the method comprising:

• storing a digital image in an image memory, wherein the digital image is sequenced into a plurality of tiles, and each of the plurality of tiles is sequenced into a plurality of lines;
• transferring a first line of a first tile of the plurality of tiles to a first line segment buffer wherein a size of the first tile comprises a number of lines, a number of pixels per line, and a number of bits per pixel, and wherein a size of the line segment buffer is equal to the number of pixels per line multiplied by the number of bits per pixel;
• transferring a second line of the first tile of the plurality of tiles to a second line segment buffer, wherein the first and second lines are different;
• sequentially reading the first line from the first line segment buffer and the second line from the second line segment buffer;
• separately rotating the first and second lines according to one of a 90 degree rotation, a 180 degree rotation, and a 270 degree rotation;
• transferring the rotated first and second lines to a write buffer simultaneously for aggregation as a rotated tile;
• determining an address in the image memory for the rotated tile;
• and writing the rotated tile to the image memory from the write buffer for storage at the address.

A system for rotating images, the system comprising:

• a processor coupled to memory and configured to implement:
• an image memory configured to store an image, wherein the image is sequenced into a plurality of tiles, and each of the plurality of tiles is sequenced into a plurality of lines;
• a first line segment buffer configured to read, from the image memory, a first line of a first tile of the plurality of tiles, wherein a size of the first tile comprises a number of lines, a number of pixels per line, and a number of bits per pixel, and wherein a size of the first line segment buffer is equal to the number of pixels per line multiplied by the number of bits per pixel;
• and
• a second line segment buffer configured to read, from the image memory, a second line of the first tile of the plurality of tiles, wherein the first and second lines are different, and wherein the processor is configured to sequentially read the first line from the first line segment buffer and the second line from the second line segment buffer, separately rotate the first and second lines based on an orientation selection, transfer the rotated first and second lines simultaneously to a write buffer for aggregation as a rotated tile;
• and
• determine an address in the image memory for the rotated tile, wherein the write buffer is configured to write the rotated tile to the image memory at the address.