JPS63243990A - Character transmission system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a character transfer method when characters are developed in a graphic display device, an electrophotographic printer, or the like.

(Prior Art) Conventionally, when characters are developed at high speed using a graphic display device, an electrophotographic printer, etc., for example, character images are transferred from a font memory that holds character images to a frame memory that holds information to be displayed on a display. It is to transfer. Normal characters include ANK, Kanji, etc., and since the amount of information is enormous, character pattern information is generally written in a predetermined area of the font memory 10, as shown in FIG. FIG. 4 shows an example of character pattern information written in a predetermined area of the font memory 1, in which the character pattern "Kan" is written in area a.

However, in order to actually display and print character information, spatial data as shown by diagonal lines around the character pattern is required at the time of transfer into the frame memory as shown in FIG. For this purpose, as shown in FIG. 6(A), write the spatial pattern information indicated by A into the frame memory,
Furthermore, as shown in Figure 6 (B), character pattern information (Kan)
is transferred to a predetermined location in frame memory. For this reason,
Figure 6 (A) and (B) shows the character pattern information transfer process.
This process had to be carried out in two stages as shown in Figure 2, which had the disadvantage that the character development speed was slow.

(Problems to be Solved by the Invention) As mentioned above, conventional character transfer methods such as graphic display devices and electrophotographic printers create a necessary space in the frame memory, and the font memory is stored in this space. Since the two-step process of transferring the character image from the source was performed, there was a drawback that the character development was slow. SUMMARY OF THE INVENTION The present invention aims to eliminate the above-mentioned drawbacks, and aims to provide a character transfer method that can rapidly develop character pattern information into a frame memory.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a character development system that reads character images from a font memory, transfers them to a frame memory, and develops the characters, which includes a character storage area of the font memory. address generating means for generating an address for accessing a predetermined area; determining means for determining whether the address is in the character storage area or a predetermined area other than the character storage area; When the address is in the predetermined area other than the specified area, select the pattern information held in the storage means and transfer it to the frame memory, and when the address is in the character storage area, select the pattern information held in the storage means and transfer it to the frame memory, and when the address is in the character storage area, select the pattern information held in the storage means and transfer it to the frame memory. A system is adopted comprising a selective transfer means for selecting the read foot data and transferring it to the frame memory.

(Operation) In the character transfer method of the present invention, the determining means determines whether an address for accessing a predetermined area including a character storage area of the font memory generated by the address generation means is in the character storage area or is outside the character storage area. It is determined whether the selected area is in the predetermined area and the result is passed to the selection transfer means. When the passed address is in the predetermined area other than the character storage area, the selection transfer means selects pattern information held in the storage means and transfers it to the frame memory;
When the address is in the character storage area, pattern information read from the address section of the font memory is selected and transferred to the frame memory.

(Example) An example of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing an embodiment of a character expansion system to which the character transfer method of the present invention is applied. 30 is an address generator that generates X and Y addresses for accessing a predetermined area of the font memory 60;
, a comparator 35 for comparing the contents of the X address counter 31 and the contents of the X coordinate window area specification register 33, and a comparator 36 for comparing the contents of the Y address counter 32 and the contents of the X coordinate window area specification register 34. There is. 4
0 is a transfer data selection write circuit that writes transfer pattern information to the frame memory 50 to the frame memory 5G, and the arithmetic unit 41, for example, a register 42 that holds pattern information of 8 bits all "O", pattern information from the register 42, It has a selection circuit 43 that selects and outputs either pattern information from the arithmetic unit 41 or pattern information from the frame memory 50, and a barrel shifter 44 that performs processing to eliminate boundaries within the frame memory 50. 50 is a frame memo I in which pattern information for display or printing is written; 60 is a font memory that holds character pattern information; 70 is another transfer data operation writing circuit; 80 is another frame memory; 90 is a font memory that holds character pattern information; It is a system bus. FIG. 2(A) shows the font memory 60
61 is a pattern area to be transferred to the frame memory 50, and 62 is a window area in which character pattern information is stored. FIG. 2(8) is a detailed schematic diagram of the frame memory 50, where 51 is a space section and 52 is character pattern information.

Next, the operation of this embodiment will be explained. The X, Y address counters 31 and 32 of the address generator 30 generate X, Y addresses for accessing the pattern area 61 to be transferred to the frame memory 50 of the font memory 60.

These X and Y addresses are compared with the contents of the X and Y coordinate window area specification registers 33 and 34 by comparators 35 and 36, and the comparison result is transferred information 200 (maximum 16 bits).
It is output to the selection circuit 43 as. That is, the contents held in the X and Y coordinate window area designation registers 33 and 34 are shown in FIG.
The address space of the window area 62 in which only one character pattern information shown in A) is stored is shown. Therefore, the comparators 35 and 36 detect whether the position in the font memory 60 specified by the X and Y addresses is outside or inside the window area 62. X, Y counter 31
．． The address No. 32 is transferred to the font memory 60 via the system bus 90, and pattern information is read from the font memory 60. The pattern information is system bus 9
Arithmetic unit 4 of data selection write circuit 40 transferred via 0
1 is passed through and output to the selection circuit 43. On the other hand, according to the transfer information 200 from the comparators 35 and 36, the X and Y addresses accessing the font memory 60 are in the window area 1.
If it is outside B2 and within the entire area 61, the selection circuit 4
3 selects pattern information from the register 42 and writes it into the frame memory 50.

The X, Y counters 31 and 32 are sequentially updated and pattern information is read from the font memory 60, but if it is outside the area 82, the same processing as above is performed. As a result, in the frame memory 50, the spatial portion 51 shown in FIG. 2 is created by the spatial data pattern. Next, if the transfer information 200 indicates that the X and Y addresses are within the window area 62, the selection circuit 43 transfers the X and Y addresses from the font memory 60 via the arithmetic unit 41.

The pattern information of the Y address part is selected and written into the frame memory 50. As a result, frame memory 5
0, character pattern information 52 shown in FIG. 2 is formed by the pattern information. By the way, when writing new pattern information into the frame memory 50 in consideration of the pattern information previously written in the frame memory 50, the pattern information read from the frame memory 50 is input to the arithmetic unit 41 via the barrel shifter 44. For this purpose, the arithmetic unit 41 performs a logical sum or logical product between the pattern information a information 100 from the font memory 60 and the pattern information [300 from the frame memory 50, and outputs the result of the calculation to the selection circuit 43. However, the barrel shifter 44 performs processing to eliminate boundaries within the frame memory 50 when reading memory data from the frame memory 50.

Note that the pattern information read from the frame memory 50 is output to a display device and a printer (not shown) via the system bus 90. In addition, the transfer data selection circuit 7
0 also performs the same operation as the transfer data selection/reading circuit 40.

According to this embodiment, when the pattern information fFi 52 is transferred from the font memory 60 to the frame memory 50, the necessary space 51 around the pattern information 52 is transferred to the frame memory 50 at the same time.
By reducing the processing time for transferring character pattern information from 0 to the frame memory 50, characters can be developed onto the frame memory 50 at high speed.

[Effects of the Invention] As described above, according to the character transfer method of the present invention, character pattern information can be expanded into a frame memory at high speed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a character expansion system to which the character transfer method of the present invention is applied, FIG. 2 is a detailed schematic diagram of the font memory and frame memory shown in FIG. 1, and FIG. A schematic diagram showing the structure of a conventional font memory, FIG. 4 is a diagram showing an example of storing characters in the font memory,
FIG. 5 is a diagram showing an example of character storage in a frame memory, and FIG. 6 is a diagram illustrating a conventional character transfer method. 30...Address generator 31...X address counter 32...Y address counter 33...X coordinate window area specification register 34...
Y-coordinate window area specification registers 35, 36...Comparators 40.70...Transfer data selection writing circuit 41...
・Arithmetic unit 42...Register 43...Selection circuit 44...
・Barrel shifter 50.80...Frame memory 60
...Font memory agent Patent attorney Nori Ken Chika Yudo Sanno - Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A character development system that reads a character image from a font memory, transfers it to a frame memory, and develops the character, comprising: an address generation means for generating an address for accessing a predetermined area including a character storage area of the font memory; determining means for determining whether the address is in the character storage area or the predetermined area other than the character storage area; selecting and transferring this to the frame memory; and when the address is in the character storage area, selecting pattern information read from the address section of the font memory and transferring it to the frame memory; A character transfer method characterized by comprising a transfer means.