Abstract: In a method and system for controlling rotation of a color image stored as sub-sampled image data in a memory, a controller includes a finite state machine (FSM) operable to fetch the sub-sampled image data and provide the sub-sampled data as a plurality of pixels to form the color image having a predefined angle of rotation. The FSM provides a predefined address of sub-sampled image data describing the color image stored in the memory to an addressing unit. The addressing unit is operable to read twice the sub-sampled image data located at the predefined address. A memory device is operable to push each read instance of the sub-sampled image data. A pipeline controlled by the FSM is operable to pull and selectively read the sub-sampled image data from the memory device for generating the plurality of pixels.

Abstract: Methods and systems are disclosed for preprocessing video display pixel data. A preprocessor is provided with a selectable gamma correction mode and a selectable palette lookup mode. In palette lookup mode, a LUT memory area is used for performing a palette lookup for each of the red, green, and blue components of video pixel data, concatenating the paletted red, green, and blue components, and outputting paletted preprocessed pixel data. In gamma correction mode, the preprocessor uses the same LUT memory area for performing gamma correction on each of the red, green, and blue components of video pixel data, concatenating the gamma-corrected red, green, and blue components, and outputting a gamma-corrected preprocessed pixel data.

Abstract: A visual display is provided on a data processing apparatus by storing and retrieving display information. The display information is stored by receiving write access addresses (33), translating the write access addresses into write memory addresses (15) and using the write memory addresses to store the display information (11). The read operation includes providing read access addresses (37), translating the read access addresses into memory read addresses (19) and using the memory read addresses to retrieve the display information (11).