Rotating image data

Claim 5

The method of claim 2 , wherein the color is a gray scale level.

Claim 6

The method of claim 2 , wherein the number of bits specifying the color is two (2), the word size is thirty two (32) bits, the size of a side of the square region is four (4) pixels, the expansion constant is a hexadecimal value 0x41041, and the filter constant is a hexadecimal value 0x03030303.

Claim 7

The method of claim 2 , wherein the number of bits specifying the color is one (1), the word size is sixty four (64) bits, and the size of a side of the square region is eight (8) pixels.

Claim 8

The method of claim 2 , wherein the number of bits specifying the color is four (4), the word size is sixteen (16) bits, and the size of a side of the square region is two (2) pixels.

Claim 9

The method of claim 2 , wherein the number of bits specifying the color is four (4), the word size is sixty four (64) bits, and the size of a side of the square region is four (4) pixels.

Claim 10

The method of claim 2 , wherein the tasks performed for each row further comprises: setting a group of bits representing a color of a last pixel in the row to zero before expanding the row; and resetting a group of bits representing the color of the last pixel in the row to an original value after expanding the row.

Claim 11

A computer-readable medium having computer-executable instructions for a computer to perform a method comprising: dividing an area of image data into square regions of pixels based on a word size and a bits per pixel size, said square having a plurality of rows; rotating each row of each square region by expanding one or more bytes containing a plurality of pixel values into an expanded row word having one or more bytes; combining each expanded row word to provided a rotated square region; and translating the rotated square region to provide a rotated area of image data.

Claim 12

A computer-readable medium having computer-executable instructions for a computer to perform a method comprising: dividing an area of image data into square regions of pixels based on a word size and a bits per pixel size, said square having a plurality of rows; rotating each row of each square region by expanding one or more bytes containing a plurality of pixel values into an expanded row word having one or more bytes; combining each expanded row word to provided a rotated square region; and translating the rotated square region to provide a rotated area of image data.

Claim 13

A computer-readable medium having computer-executable instructions for a computer having a word size to perform a method for rotating an area of image data, the method comprising: dividing the area into a square region of pixels, said pixels having a number of bits specifying a color, said square having a plurality of rows, a size of a side of said square region being determined by the word size of the computer and the number of bits specifying the color; for each row in the square area executing the tasks of: expanding one or more bytes representing a row into a word by multiplying the value represented by the one or more bytes by an expansion constant determined by the word size and the number of bits specifying the color, masking bits in the word by performing a logical AND of the word with a filter constant determined by the number of bits specifying the color, and left shifting the word by a number of places determined by the index of the row in the square and the number of bits specifying color and placing the result into one of a plurality of expansion rows; performing a logical OR of the plurality of expansion rows to produce a rotated square region of pixels; and performing a translation along an X and Y axis to place the rotated square region into a rotated image buffer.

Claim 14

A computer-readable medium having computer-executable instructions for a computer having a word size to perform a method for rotating an area of image data, the method comprising: dividing the area into a square region of pixels, said pixels having a number of bits specifying a color, said square having a plurality of rows, a size of a side of said square region being determined by the word size of the computer and the number of bits specifying the color; for each row in the square area executing the tasks of: expanding one or more bytes representing a row into a word by multiplying the value represented by the one or more bytes by an expansion constant determined by the word size and the number of bits specifying the color, masking bits in the word by performing a logical AND of the word with a filter constant determined by the number of bits specifying the color, and left shifting the word by a number of places determined by the index of the row in the square and the number of bits specifying color and placing the result into one of a plurality of expansion rows; performing a logical OR of the plurality of expansion rows to produce a rotated square region of pixels; and performing a translation along an X and Y axis to place the rotated square region into a rotated image buffer.

Claim 15

The computer readable medium of claim 10 , wherein the color is a gray scale level.

Claim 16

The computer readable medium of claim 10 , wherein the number of bits specifying the color is two (2), the word size is thirty two (32) bits, the size of a side of the square region is four (4) pixels, the expansion constant is a hexadecimal value 0x41041, and the filter constant is a hexadecimal value 0x03030303.

Claim 17

The computer readable medium of claim 10 , wherein the number of bits specifying the color is one (1), the word size is sixty four (64) bits, and the size of a side of the square region is eight (8) pixels.

Claim 18

The computer readable medium of claim 10 , wherein the number of bits specifying the color is four (4), the word size is sixteen (16) bits, and the size of a side of the square region is two (2) pixels.

Claim 19

The computer readable medium of claim 10 , wherein the number of bits specifying the color is four (4), the word size is sixty four (64) bits, and the size of a side of the square region is four (4) pixels.

Claim 20

The computer readable medium of claim 10 , wherein the tasks performed for each row further comprises: setting a group of bits representing a color of a last pixel in the row to zero before expanding the row; and resetting a group of bits representing the color of the last pixel in the row to an original value after expanding the row.