Image display control apparatus

Claim 2

An image display control apparatus comprising; a display unit; an image memory having a picture element data storing capacity larger than the total number of picture elements on the screen of said display unit; write control means for writing a plurality of units of data into a plurality of memory locations of said image memory, each unit of data including at least two picture element data; a mapping memory for storing only address data for specifying the memory locations for the units of data in said image memory in order to correspondingly display the units of data on a plurality of display segments in the screen of said display unit; first means for reading out the address data from said mapping memory in a display order of said display unit; and second means for reading out from said image memory the units of data specified by the address data read out by the first reading means, and for supplying the read-out units of data to said display unit.

Claim 3

An image display control apparatus according to claim 1, wherein said first means for reading out includes means for reading out a plurality of address data from said mapping memory, and said second means for reading out includes means for reading out the plurality of units of picture elements data from said image memory, using the plurality of the read out address data.

Claim 4

An image display control apparatus according to claim 2, wherein at the memory locations of said mapping memory are stored the plurality of address data and arithmetic operation data for editing the plurality of picture element data designated by the address data, and said means for supplying the picture element data to said display unit includes means for editing the units of plurality of picture element data on the basis of the arithmetic operation data read out from said mapping memory.

Claim 5

A image display control apparatus according to claim 3, wherein said editing means includes a plurality of registers for storing the plurality of picture element data units read out of said image memory, a logic operation unit for executing an operation on the plurality of picture element data units supplied from said registers by using said arithmetic operation data, to thereby compose picture element data blocks, and a shift register for storing the output from said arithmetic operation unit.

Claim 6

An image display control apparatus according to claim 3, wherein the arithmetic operation data stored in the memory locations of said mapping memory contains masking data including start and end bits to designate a part of each of the picture element data units not to be displayed.

Claim 7

An image display control apparatus comprising: a display unit; an image memory including n image memory units for storing display image data of (n×X) columns and Y rows having (n×X×Y) picture elements data with (n×X) picture elements arranged in a horizontal direction and Y picture elements arranged in a vertical direction, each memory unit having a picture element data storing capacity of X in the horizontal direction and Y in the vertical direction; means for distributing said (n×X×Y) picture elements data to said n image memory units in such a manner that the units of n picture elements data in a first row are sequentially distributed to the image memory units and the units of n picture elements data in a second row adjacent to said first row shifted by one picture element data from those of said first row is sequentially distributed to the n image memory units; a mapping memory for storing only address data for specifying memory locations for the units of n picture elements data in said image memory units in order to correspondingly display the units of data on a plurality of display segments on a screen of said display unit; means for generating access direction designating data for designating an access direction of the picture element data stored in said n image memory units; first means for simultaneously accessing said n image memory units for reading out the picture elements data successively in the horizontal direction according to the access direction designating data; and second means for simultaneously accessing said n image memory units for reading out the picture elements data successively in the vertical direction according to the access direction designating data.

Claim 8

An image display control apparatus comprising: a display unit; an image memory including n image memory units for storing display image data of (n×X) columns and Y rows having (n×X×Y) picture elements data with (n×X) picture elements arranged in a horizontal direction and Y picture elements arranged in a vertical direction, each memory unit having a picture element data storing capacity of X in the horizontal direction and Y in the vertical direction; means for distributing said (n×X×Y) picture elements data to said n image memory units in such a manner that the units of n picture elements data in a first row are sequentially distributed to the image memory units and the units of n picture elements data in a second row adjacent to said first row shifted by one picture element data from those of said first row is sequentially distributed to the n image memory units; a mapping memory for storing only address data for specifying memory locations for the units of n picture elements data in said image memory units in order to correspondingly display the units of data on a plurality of display segments on a screen of said display unit; means for generating access direction designating data for designating an access direction of the picture element data stored in said n image memory units; first means for simultaneously accessing said n image memory units for reading out the picture elements data successively in the horizontal direction according to the access direction designating data; and second means for simultaneously accessing said n image memory units for reading out the picture elements data successively in the vertical direction according to the access direction designating data.

Claim 9

An image display control apparatus according to claim 6, wherein said first simultaneous accessing means includes control mens for selecting said access direction designating data on the basis of the locations of the picture element data in one of the n image memory units.

Claim 10

An image display control apparatus according to claim 6, wherein said distributing means includes picture element interchange means for interchanging the picture element data in their arranged order on the basis of the picture element locations in one of the n image memory units.

Claim 11

An image display control apparatus according to claim 6, wherein said image memory includes two image memory units, and said distributing means includes a flip-flop circuit for alternately generating first and second outputs which alternately designate the two image memory units.