JPH03132796A - Display controller - Google Patents

Abstract

PURPOSE:To generate a new kind of character font and to increase the number of kinds of characters to be displayed by performing logical operation between a character pattern which is already written in a work memory and a character pattern to be written in the work memory from a 1st memory. CONSTITUTION:A character pattern ROM 5 is a read only memory ROM stored with character patterns of, for example, English letter 'ABCDEF...' as dot images. The work memory 7 is an area wherein the character patterns stored in the character pattern ROM 5 are read out and processed by a logical operation part 9 to generate new character fonts. The logical operation part 9 generates the new character patterns to be transferred from the character pattern ROM 5 to the work memory 7. For example, the new character font of reverse print characters, etc., are generated. Namely, when the logical operation part 9 overwrites an English letter 'A' in coordinates (1,1) and then the dots of 'A' in the X-Y coordinates become 0, so that the reverse print character of the English letter 'A' is generated.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a display control device that creates various documents and displays the created documents, and particularly relates to a display control device that uses existing character patterns. The present invention relates to a display control device that creates and displays a new type of character font.

(Prior Art) In recent years, the number of personal computers, word processors, workstations, etc. equipped with a document creation function is increasing. The conventional display control device equipped with the above document creation function reads pattern data of characters to be displayed from a character pattern ROM, converts the pattern data into a video signal, and outputs the video signal to a CRT for display. The characters used for creating the document are pattern data stored in the character pattern ROM, so in order to increase the number of characters used for creating characters, the character pattern R
It was necessary to add an OM or to add a magnetic disk storing the same pattern data. For this reason,
There is a risk that the mechanism of the device will become complicated due to the addition of a character pattern ROM or the like.

(Problems to be Solved by the Invention) In conventional devices, when increasing the number of characters used for document creation, it was necessary to add a character pattern ROM or magnetic disk. The addition of character pattern ROMs or magnetic disks may complicate the device and increase maintenance costs, and a countermeasure has been desperately needed.

The present invention has been made in view of the above, and its purpose is to create a new type of character font and change the characters to be displayed without complicating the device or increasing maintenance costs. An object of the present invention is to provide a display control device that improves the performance of the device by increasing the number of types.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the present invention provides a first memory storing a character pattern, and a character pattern stored in the first memory. A new type of character font is created by performing a logical operation on the work memory in which is written, the character pattern already written in this work memory, and the character pattern to be written in the work memory from the first memory. The gist of the present invention is to include a font creation means and a display means for storing and displaying a character font created by the font creation means in a second memory.

(Function) In the display control device having the above configuration, the character pattern stored in the first memory is extracted from the character pattern already written in the work memory to which it is written and the memory of the node 1 in the work memory. Performs a logical operation on the character pattern to be written. This logical operation creates a new type of character font, stores the character font in the second memory, and displays it. You can create character fonts.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram showing control according to an embodiment of the display control device of the present invention.

The display control device includes a CPU, a main memory 3°, a character pattern ROM 5 (first memory), a work memory 7 (second memory), and a logic operation unit 9 (font creation means).
to create a new character font.

The above-mentioned CPUI controls the entire device including the logic operation section 9, which will be described later.

The main memory 3 stores a control program for controlling the operation of the CPUI, character types, and the like. The main memory 3 will be explained using the memory map shown in FIG. Code data of characters to be displayed is stored in an upper address of the main memory 3, and a storage address of a character pattern in a character pattern ROM 5, which will be described later, is calculated from this code data. At the next address of the display character code, a character offset X1 character offset Y of the X and Y coordinates indicating the writing start position of the character to be originally displayed is stored for the character size. The address next to the above character offsets X and Y is character size X, which indicates the size of the character to be displayed.
At the next address, bitmap memories X and Y indicating the X and Y coordinates of a bitmap memory 15 of the actual display size, which will be described later, are stored. Additionally, the next address stores the encoded character type to be displayed. If this character type matches the original font, the character size X, Y is transferred from the character offsets X, Y to the XY coordinates of a bitmap memory 15, which will be described later, and displayed on the CRT 19.

Returning to FIG. 1, the character pattern ROM 5 is a read-only ROM in which, for example, a character pattern of English letters "rABCDEF..." is stored as a dot image.

The work memory 7 is an area where character patterns stored in the character pattern ROM 5 are read out by the logic operation section 9 to create new character fonts. Note that the work memory 7 may be any memory provided with an area in which character fonts can be created.

The logic operation unit 9 creates a new character pattern to be transferred from the character pattern ROM 5 to the work memory 7, for example, creates a new character font such as white characters and uppercase characters. Creation of a new character font by the logical operation unit 9 will be explained using FIGS. 3(a) to 3(g).

First, change the English letters “ABcD...” in Figure 3(a) to the third
When creating the white characters shown in FIG. (d)) is transferred to the origin of the XY coordinates of the work memory 7, which is 0, to the position Pi shown in FIG. 3(e). Next, the logic operation unit 9 sets the Y coordinate to 0, shifts the X coordinate to o, 1°2, and calculates P2. Transfer the alphabetic character rAJ from the character pattern ROM 5 to the position P3. Further, the logic operation unit 9 sets the Y coordinate to 1 and shifts the X coordinate to o, 1°2, so that the values are Q+, Q2 . Transfer the alphabetic character rAJ from the character pattern ROM 5 to the position Q3. Similarly, the logic operation unit 9 sets the Y coordinate to 2 and the X coordinate to 0.1.
2 and transfers the alphabetic character rAJ from the character pattern ROM 5, overwriting a total of nine times (FIG. 3(i)).

After the above-mentioned overwriting, the CPUI controls the logical operation to be an exclusive OR, so that the logical operation section 9 calculates the X coordinate and the Y coordinate.
When the English character rAJ is superimposed on the coordinate 1, the dot of rAJ at the X and Y coordinates 1 becomes 0, and a white character of the English character rAJ is created (FIG. 3(g)). English characters rBCD...
・'' is also performed in the same manner as above.

Next, when creating the bold letters shown in FIG. As 0, the English letter r from the character pattern ROM5 at the X coordinate of 0.1
Transfer AJ. Also, the Y coordinate is 1.2 and the X coordinate is 0.
1, the English character rAJ is transferred from the character pattern ROM 5 and overwritten four times in total. The CPUI transfers the bold character (FIG. 3(h)) created by overwriting to the bitmap memory 15 by the character size from the xyX coordinate origin and displays it.

The number of times the white characters and bold characters are overwritten is 9 times and 4 times, respectively, but it is of course possible to change the number of times the overwriting is performed depending on the type of character to be created.

The above logic operation section 9 etc. are connected to the CPU via the system bus 11.
is connected to perform data transfer.

Returning to FIG. 1 again, the display control device includes a display controller 13. It has a bitmap memory 15 (second memory), a parallel-to-serial converter 17, and a CRT 19.

The display controller 13 outputs a rask address to the bitmap memory 15 in response to a control signal from the CPUI, and controls the display of character data transferred to the bitmap memory 15.

The bitmap memory 15 stores character patterns directly transferred from the character pattern ROM 5 or white characters and bold characters created in the work memory 7 as dot images.

Although the bitmap memory 15 is used in this embodiment, it is needless to say that the memory is not limited to a bitmap memory and may be any memory having the above-mentioned functions.

The stored character patterns and the like of the dot image are transferred to the parallel-to-serial converter 17 in response to the rask address.

The parallel-serial converter 17 converts the input dot image character pattern etc. into a video signal and outputs it to the CRT 19 to be displayed on the CRT 19.

Next, the operation of this embodiment will be explained using the processing flowchart shown in FIG.

First, after power is turned on to the apparatus, when characters to be used for document creation are specified, the CPUI calculates the address in the character pattern ROM 5 of the character pattern to be displayed from the display character code in the main memory 3 (step 100). next,
The character type in the main memory 3 is checked to see if it is the original font (step 110). If the character pattern specified by matching is not the original font, the process proceeds to step 140;
If it is the original font, the CPUI will use the character pattern ROM5.
From there, only the character size is transferred to the bitmap memory 15 (step 12o).

Proceeding to step 140, the CPUI initializes the work memory 7. When the specified character pattern is a white character, the CPU sets the logical operation to OR and executes step 1.
70, if it is an uppercase character, the CPUI sets the logical operation to OR and proceeds to step 280 (steps 140-1).
60, 280) Proceeding to step 170, the logical operation section 9 transfers the English character rAJ from the character pattern ROM 5 to the X coordinate of the work memory 7 and the origin which is 0 of the X coordinate.

After the transfer, the logic operation section 9 counts up the X coordinate, transfers the English character rAJ from the character pattern ROM 5 to each of the X coordinates 1.2, and then counts up the X coordinate. Repeat the above loop from 0 to 2 for the X coordinate until the X coordinate is 1.2, transfer rAJ from the character pattern ROM 5, and overwrite it a total of 9 times (steps 170 to 230).
.

After overwriting, the CPU performs a logical operation using an exclusive OR (X
OR), and the logic operation unit 9 transfers rAJ from the character pattern ROM 5 to the X coordinate and the X coordinate 1. As a result of the transfer, the dot "A" at the position where the X coordinate is 1 is inverted and a white character is created (step 240
~260).

The CPUI transfers the white character font created in the work memory 7 to the bitmap memory 15 (step 270).

On the other hand, when proceeding to step 290 for creating a bold character, the logic operation section 9 sets the X coordinate to O and transfers the English character rAJ from the character pattern ROM 5 to each of the X coordinates 0 and 1, as described in steps 170 to 230. Furthermore, when the X coordinate is 1, the logical operation unit 9 transfers the English letter rAJ from the character pattern ROM 5 to each of the X coordinates 0 and 1 and overwrites the letter a total of four times to create the bold letter rAJ. After overwriting, the CPUI transfers the created bold character rAJ from the xyX coordinates 0 to the bitmap memory 15 (step 2).
90-360).

The white characters etc. transferred to the bitmap memory 15 are
The data is sent to the parallel-to-serial converter 17 according to the rask address of the display controller 13 and displayed on the CRT 19.

Although this embodiment uses overwriting as a method for creating white characters or bold characters, it is needless to say that the method is not limited to this.

Further, as an example of application of this embodiment, it is also possible to apply it to document creation using a printer device or the like by improving the software of the logic operation section 9 for printing.

As described above, the present invention can be implemented with various changes within the scope of the invention.

[Effects of the Invention] As explained above, according to the present invention, a new type of character font can be created and the types of characters to be displayed can be changed without complicating the device and without increasing maintenance costs. By increasing , the performance of the device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing control according to an embodiment of the display control device of the present invention, FIG. 2 is a diagram showing a memory map of the main memory, FIG. 3 is a diagram showing a display example according to the present invention, and FIG. is a flowchart showing the operation of the present invention. 1...CPU 3...Main memory 5
...Character pattern ROM 7...Work memory 9
...Logic operation section 767-

Claims (1)

[Claims] A first memory storing a character pattern;
A work memory in which the character pattern stored in the memory of A display control device comprising: font creation means for creating a new type of character font; and display means for storing and displaying the character font created by the font creation means in a second memory. .