Systems and methods for efficiently displaying graphics on a display device regardless of physical orientation

A system for copying a portrait-oriented graphic in a system memory to a landscape-oriented frame buffer for a default landscape-oriented display device, said system comprising:

• a processor, said processor comprising an L2 cache and a write-combine cache;
• a system memory coupled to said processor, said system memory comprising a portrait-oriented shadow memory;
• a landscape-oriented frame buffer coupled to said processor;
• and
• computer instructions for said processor to load a plurality of blocks comprising pixels from system memory into the L2 cache, process said pixels into two or more sub-columns comprising pixels that will be written to consecutive memory locations of the frame buffer, and write said sub-columns to a frame buffer via the write-combine cache.

A computer-readable medium having computer-readable instructions for copying a portrait-oriented graphic in a system memory to a landscape-oriented frame buffer for a default landscape-oriented display device, said computer-readable instructions comprising:

• instructions for reading a first plurality of blocks from the system memory into an L2 cache, said plurality of blocks comprising:
• a first plurality of pixels, comprising a sub-column of vertical pixels in the graphic, said first plurality of pixels to reside in consecutive memory locations of the frame buffer;
• and
• a second plurality of pixels, comprising a sub-column of pixels in the graphic adjacent to the first plurality of pixels, said second plurality of pixels to reside in consecutive memory locations of the frame buffer;
• instructions for writing said first plurality of pixels to the frame buffer via a write-combine cache;
• and
• instructions for writing said second plurality of pixels to the frame buffer via the write-combine cache.

A system for copying a portrait-oriented graphic in a system memory to a landscape-oriented frame buffer for a default landscape-oriented display device, said system comprising:

• means for loading a plurality of blocks of pixels (a band) into an L2 cache;
• means for processing the band into sub-columns of pixels in the graphic having consecutive memory locations on the frame buffer;
• and
• means for writing said sub-columns of pixels to the graphic via a write-combine cache.

A hardware device for copying a portrait-oriented graphic in a portrait-oriented first memory location to a landscape-oriented second memory location, said hardware device comprising:

• a processor, said processor comprising an L2 cache and a write-combine cache;
• a first memory coupled to said processor, said first memory having portrait-oriented addressing such that the pixels of the graphic, from left to right in rows running from top to bottom, are stored in consecutive memory locations in said first memory;
• a second memory coupled to said processor, said second memory having landscape-oriented addressing such that the pixels of the graphic must be remapped;
• computer instructions for said processor to load a plurality of blocks comprising pixels from said first memory into the L2 cache;
• process said pixels into two or more sub-columns comprising pixels that will be written to consecutive memory locations of the second memory, and write said sub-columns to said second memory via the write-combine cache.