Display controller for rotation of image data

摘要

In one embodiment, a display controller comprises control logic that rotates a frame image by two-dimensional blocks of pixels when the frame image is rotated from an original orientation.

主权项

1. A display controller implemented in at least hardware, the display controller comprising:
control logic configured to rotate a frame image by two-dimensional blocks of pixels when the frame image is rotated from an original orientation; wherein the control logic includes rotation logic configured to rotate the frame image by:
retrieving data representing the frame image from a memory in two-dimensional block transactions wherein a two-dimensional block transaction includes retrieving pixels from multiple pixel lines in the memory where less than a full line of pixels in each of the multiple pixel lines are retrieved during each two-dimensional block transaction; andwherein the retrieving includes reading out the pixels from the memory in a rotated order based on the two-dimensional blocks, wherein each pixel is retrieved once from the memory, and displaying the pixels on a display screen in the rotated order.