JPH01154193A - High speed font development system of data processor - 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] This invention is applicable to word processors, personal computers, and DPS (data processing systems).
,Other keysRegarding the improvement of the font development method of various data processing devices that have the function of developing fonts of human-generated character codes and displaying them on the screen, in particular, processing of addition/deletion of character data in editor operations, that is, editing To significantly reduce the display processing time due to font development even when the layout of the display screen changes when characters are added, deleted, or moved on the screen to text data that has already been created. This invention relates to a high-speed font expansion method that enables high-speed font expansion and improves the operating efficiency of editors, etc.

BACKGROUND ART Conventionally, word processors, personal computers, and other data processing devices with a font development function have developed fonts one character at a time on the screen according to input character codes when editing.

However, in the conventional font expansion method, by adding or deleting one or more characters to the text data displayed on the screen, that is, a character string that has been edited to a certain extent, the layout of the entire screen is created. If this changes, it is necessary to redeploy the text for the planning aspect.

As a result, editing operations such as adding or deleting a single character require font development for the displayed characters on the entire screen, and the processing time for this font development makes it impossible to perform high-speed development.As a result, the editing process This has the disadvantage that the efficiency of the system also decreases.

For example, a case where full-screen font development processing is required is when there is no margin or the like in the edited character string and added characters cannot be absorbed. If there is a blank space at the end of a line due to a line break, etc., the characters added in that part can be expanded into fonts, and the rest of the display screen is not affected.

However, in actual editor operations, such cases are rare, and in many cases it is necessary to reprocess the entire screen.

First, a configuration example of a conventional data processing device having a font development function will be described.

FIG. 12 is a functional block diagram showing an example of the configuration of the main part 2 of a conventional data processing device having a font development function. In the drawing, 1 is the CPU, la is its memory, 2 is FHDC (floppy hard disk controller), 3 is HDD (hard disk driver), 4 is FDD (floppy disk driver), and 5 is A CRT controller, 6 a video memory, 7 a CRT display unit, 8 a printer controller, 9 a printer, and 10 a system bus.

The functions of each part of the data processing device, such as a word processor, shown in FIG. 12 are outlined as follows.

The CPUI and memory 1a constitute a system control section of the word processor.

That is, the memory 1a is an R memory that stores a program ROM that controls the entire system, fonts, and other data.
The CPU is the 12th system memory consisting of AM, etc.
Manage the entire system of diagrams.

FHDC2 is the floppy disk where fonts are stored.
A controller for extracting data from storage units such as disks and hard disks.

The HDD 3 is a driver that drives a hard disk, which is an external storage unit.

FDD4 is a driver that drives a floppy disk, which is also an external storage unit.

The CRT controller 5 is a BITBL
T) function, that is, for a rectangular image data area, it has a function to transfer the image data of that area as it is, and also has a function to control the display of the CRT display unit 7.

The video memory 6 is a memory that stores font-expanded data displayed on the CRT screen. The area actually displayed on the CRT screen (display memory area) is a part of this video memory 6, as will be described later, and includes the display area on the CR1 screen and the entire area of the video memory 6. This does not necessarily mean that there is a one-to-one correspondence.The CRT display unit 7 is a display means that visually displays one character data or image data in a dot pattern on its screen. This CRT display unit 7
A CRT controller 5 is connected to the CRT controller 5, which has a control function for displaying on the screen image data in which text data developed on the video memory 6 is developed into fonts, or image data such as calligraphy. are doing.

The printer controller 8 is a controller that develops image data or character codes developed on the video memory 6 into fonts and outputs them to the printer 9 .

The printer 9 is a dot image printing device such as a laser beam printer, an inkjet printer, or a thermal dot printer, and prints dot patterns. From the computer side,
The created text data and image data are given and a hard copy is created.

In a conventional data processing device having a font development function, such as a word processor or an OA device such as a personal computer, which has the configuration shown in FIG. The image data of the character pattern, which has already been developed into a font on the video memory 6, is transferred block by block at high speed.

In other words, when scrolling the screen, even if the display area changes, character patterns that have already been developed in fonts in the video memory (editing memory) do not need to be developed in fonts for the entire screen, and will be displayed anew. A display method that develops fonts is used only for character patterns that form areas.

FIG. 13 is a diagram for explaining the operation of character font development during screen scrolling in a data processing device having a conventional font development function. (1) shows the video memory and the characters in its display area before scrolling. An example of
(2) is a diagram showing an example of the display screen after scrolling. In the drawing, RAM is a video memory, DP is its display area, DP' is an overlapping display area after scrolling, and D
P' indicates a non-overlapping display area after scrolling, and the arrow indicates right scrolling.

For example, as shown in FIG. 13 (1), the video memory R
Assume that when a character string created on AM is expanded into a font and its display area (display memory area) DP is displayed on the screen, the user scrolls one character to the right as shown by the arrow.

In this case, as shown in Fig. 13 (2), for the area DP' that overlaps with the previous display area DP, a block transfer is performed using the pattern in which the font has already been developed as image data, and the area becomes a new display area. Fonts are developed only for the characters in the non-overlapping display area DP'.

In this way, in single-screen scrolling, a method has been known in the past in which font data that has already been developed on the video memory RAM is transferred in blocks as image data.

However, when editing, the pattern data on the video memory changes due to the addition/deletion of characters, so it is not possible to simply block transfer the font-developed image data as when scrolling the screen.

Therefore, with conventional display control methods, when adding or deleting text data on the editing screen, fonts must be expanded for full screen display, which results in a time-consuming process. , there was a problem that the processing speed decreased and the processing efficiency deteriorated.

Purpose Therefore, the high-speed font expansion method of the data processing device of the present invention solves the above-mentioned disadvantages of conventional font expansion methods, that is, adding one or more characters to an edited character string by editor operation, etc. By deleting, the layout of the display screen changes, so it is necessary to redo the font development for the planned area, which slows down the processing speed. This solves the problem of slowing down the processing speed. For areas that do not require changes, the image data that has already been expanded into fonts is transferred in blocks using the BitBlit function, which shortens the display and processing time and improves system processing efficiency. The purpose is to speed up.

■--For this purpose, the present invention includes an input device, a display device,
A text memory that stores data such as edited characters and symbols, a character pattern memory that stores pattern data such as characters and symbols, a video memory that stores font-developed image data, and a memory that is stored in the text memory. font development means for storing the image data in the video memory as image data based on the pattern data stored in the pattern memory.

When displaying the edited character string as image data on the screen of the display device, in a conventional data processing device having a function of performing bit blit transfer from the video memory to the display memory, displaying the edited character string as image data on the screen. When editing the text string, such as adding or deleting it,
an order-unchanged image data area detecting means for detecting an image data area in which the order of character strings on the video memory is not changed even after an editing operation, based on information on the added/deleted characters and their positions; change area detection means for detecting a display area in which the above image data is changed, and when character strings on the screen are added or deleted by editing operations, the order non-change image data area detection means detects detecting an image data area on the video memory whose order is not changed; bit-blit transferring the image data of the area to a display memory; detecting a display area where the image data is changed by the change area detecting means; Only in the display area, the changed characters are developed into image data and displayed by the font development means.

Next, an embodiment of the high-speed font development method of the data processing apparatus of the present invention will be described in detail with reference to the drawings.

First, the relationship between the video memory of the data processing device and the CR1 display area when performing the high-speed font development method of the present invention will be described.

Figure 2 shows the video memory and CR in the data processing device.
FIG. 2 is a memory configuration diagram illustrating the relationship between one display area. In the drawing, 6a is the CR1 display area on the video memory 6, SA is the start address of the video memory 6, and SA'
is the start address of the CR1 display area, L is the width of the video memory 6, and L' is the width of the CR1 display area.

As shown in FIG. 2, a CRT display area 6a with a start address SA' and a width L' is secured on the video memory 6 with a start address SA and a width L'.

In this way, scrolling in both vertical and horizontal directions is possible within the range of the video memory 6.

Next, the case of 1 normal font development will be described. The processing in this case is similar to that of the conventional font development method.

FIG. 3 is a diagram showing the correspondence between the video memory and the actual CR7 display screen in the case of normal font development.
(1) shows the video memory 6, and (2) shows the actual CR7 display screen. The symbols in the drawing are the same as those in FIG. 2, and X and Y indicate the coordinates of the display start position of the CRT display area 6a.

During normal font development, as shown in FIG. 3 (1), each character is placed at a predetermined position within the display area 6a.
Develop the character pattern.

During this expansion process, the CPU shown in FIG.
Information such as the source address, destination address, character size, etc. is given from I to the CRT controller 5, and the CRT controller 5 uses the bit blit function, that is, the data transfer function in block units (rectangular area), to 6, the data in which the font has been expanded into the image data is transferred.

The CRT controller 5 can support the entire area of the video memory 6 shown in FIG. 3(1), that is, the entire memory space, and in the case of FIG. 3(1), the display start coordinates ( By specifying
The data in the CRT display area 6a is transferred to the actual CR
A display as shown in FIG. 3 (2) is obtained on the T screen.

And if we change the values of these coordinates (x, y).

arbitrarily and instantly in any area on the video memory 6.
It can be displayed on a CRT screen.

Next, a description will be given of processing that is characteristic of the high-speed font expansion method of the present invention, that is, display processing when an editor adds characters.

In this case, display processing includes adding one or more characters to the beginning of a line, adding one or more characters to the beginning of a line, and adding one or more characters to the beginning of the second and subsequent lines. , and 1 at the beginning of the second and subsequent lines.
There are quite a number of cases, such as when adding a character or characters.

First, the case of adding (inserting) one character to the beginning of the first line will be described.

FIG. 4 shows the high-speed font expansion method of this invention.
This is a diagram showing the correspondence between the video memory 6 and the actual CRT display screen when adding one character to the beginning of a line during editing. (1) is the video memory 6, and (2) and (3) are the actual CRT display screens.
The RT display screen (CR'T display memory) is shown. The symbols in the drawing are the same as those in FIG. 2, and 6a' is the CR7 display area on the video memory 6 after the change, ■ is the position of the added character, and ■ is the character newly expanded in font to the image data. Indicates the location of

As shown in FIG. 4 (1), on the video memory 6,
Assume that a character string has been created, and the data in the display area 6a surrounded by broken lines is output and displayed on the CRT screen.

In this display state, an editing operation is performed, and a new English character II A is added to the beginning of the line (position ■) of the already created character string.
Suppose we add #.

In the conventional font development method, the English characters II A are placed at the beginning of the line.
When adding I+, I moved the created character string "Aiue" one character to the right and moved the last character "O" down one line to the left edge, but with this method,
Since the layout of the entire screen must be changed, all characters will be reorganized and font development will be performed for each character.

In the high-speed font expansion method of the present invention, first, the entire display area is scrolled to the left by one character, and an area 6a' surrounded by a solid line is set as a new display area.

Therefore, on the CRT screen, as shown in Figure 4 (2),
The first column will be a space, and the second to fifth columns will display the image data of the characters that were displayed in the first to fourth columns before scrolling.

Next, in order from the top of the first column of this FIG. 4 (2), that is, the left end (from position ■ to position ■), rr A tp.

``O'', ``ko'', ``so'', etc. are developed into fonts.

Therefore, as shown in FIG. 4(3), a display screen is obtained in which the English letter "A" is added to the beginning of the line.

If such processing is performed, the processing time will be the transfer time to columns 1 to 4 before scrolling, that is, the transfer time to the rectangular image area (columns 2 to 5 after scrolling), and the transfer time for the first column (from position ■ to position ■) In other words, it is only the sum of the font development time of the leftmost portion.

As a result, processing time is significantly reduced compared to a conventional font development method in which all characters are developed into fonts.

The reason for this is that in the font development method of the present invention, transfer to a rectangular image area (an area where font data is not changed) can be completed instantly by simply changing the display start address of the CRT controller 5. Because it does.

In addition, in the display example of FIG. 4, for ease of understanding, the case where one line of character strings is 5 digits is shown, but on the actual display screen, for example, one line of character strings is shown. The number of characters that can be displayed on one screen is extremely large, with 40 to 60 digits and 20 to 40 lines per display.

Therefore, even if the number of characters added is 1, for example 2 to 4 characters, or n characters at the beginning of a line, the number of characters that can be transferred using the BitBlit function is greater than the number of characters that require font development. Extremely common.

For example, if one line of character string is 60 digits, even if 4 characters are added to the beginning of the line, the number of characters to be bit blit transferred is 56 (=60-4) characters, and the number of characters that require font expansion is 4 characters. Only.

In this case, if the current number of display lines is 40, the rectangular area to be bit blit transferred is 56 x 40 (=224
0 characters), and the number of characters expanded in the font is 4X40
(=160 characters).

As described above, the processing time reduction effect obtained by the high-speed font development method of the present invention is remarkable when compared with the conventional method in which all characters are developed into fonts.

Here, the main configuration of a data processing device for implementing the high-speed font development method of the present invention will be described.

FIG. 1 is a functional block diagram showing an example of the configuration of essential parts of a data processing device for implementing the high-speed font expansion method of the present invention. In the drawing, 11 is a current display start address register, 12 is a change address calculation circuit, 13 is a new display start address register, 1
Reference numeral 4 indicates a display change area calculation circuit, and reference numeral 15 indicates a text extraction circuit.

FIG. 1 shows a non-order change image data area detecting means for detecting an image data area in which the order of character strings on a video memory is not changed even after editing processing such as addition or deletion is performed, and a CRT. The main part configuration is shown including a change area detection means for detecting a display area in which image data on a video memory is changed with respect to a character string displayed as image data on a screen.

The current display start address register 11 contains the previous second address.
The coordinate information of the display start address SA' explained in the figure is saved.

When a created character string is changed or changed by editor operation, the changed address is determined based on the information on the addition or deletion of the n characters (the same applies to movements that require addition and deletion at the same time) and the information on the position. The arithmetic circuit 12 calculates the display start address to be changed. Note that this change address calculation circuit 12 simultaneously calculates information on the scroll area, that is, the direction of movement and the amount of movement thereof.

The calculated new display start address is saved in the new display start address register 13 at the next stage. This new display start address information is stored in the CRT controller 5.
bit blit transfer of the unmodified area is performed.

The display change area arithmetic circuit 14 uses the new display start address saved in the new display start address register 13 and the current display start address saved in the previous current display start address register 11.
Calculate the position of the display area where new font development should be performed.

Specifically, it detects the display area of image data that can be transferred using the BitBlit function and the area where font development should be performed on the image data, and then
Performs all arithmetic processing related to positional information necessary for bit blit transfer and font development.

Information on the display area where the calculated font expansion should be performed is as follows:
The extracted character code is applied to the text extraction circuit 15 and is expanded into a font in the display area of the changed image data.

The circuit shown in FIG. 1 performs such processing to calculate the required information, and quickly executes the process of adding one character to the beginning of a line as shown in FIG. 4 (3).

The above explanation is the process for adding one character to the beginning of a line.

Next, the case of adding one character between character strings will be explained. For drawings, refer to FIGS. 5 to 8. Throughout the drawings, ■ is the current position of the character "A", ■' is the position after the character "A" has been moved, ■ is the position of 1'" to be inserted, and ■ is the position of the character that will be newly developed in the font. shows.

Figures 5 (1) and (2) show the correspondence between the video memory 6 and the actual CRT display screen when adding one character between character strings at the time of editing in the high-speed font expansion method of the present invention. In the figure, (1) is the video memory 6, (2
) indicates an actual CRT display screen.

In this embodiment, the display state shown in FIG. 3 (1) is shown in FIG.
This is a case where the numbers at 1 n are inserted between ``a'' and ``i'' in the 1st line.

In this case as well, the display start address (x, y) is set to (X
-N, Y), and the first column is displayed as a space, as shown in FIG. 5(1). Note that N indicates the number of dots in the horizontal direction of one character, and M indicates the number of dots in the vertical direction.

Therefore, on the CRT screen, as shown in FIG. 5(2), the first column is a space, and the second to fifth columns display the characters of the first to fourth columns before scrolling.

Next, expand the font on the first line.

Figures 6 (1) and (2) show the correspondence between the video memory 6 and the actual CRT display screen when fonts are developed on the first line in the display state shown in Figure 5 (2) above. In the figure, (
1) shows the video memory 6, and (2) shows the actual CRT display screen.

In this Figure 6 (1), the character "A" at position ■' and the position ■
It is only necessary to expand rz 1 pt of Figure 6 (2)
A display screen like this will appear.

Next, in Figure 6 (1), for the remaining 2nd row and below, the characters that are out of the display area on the right side (the 6th column) are placed in the area where the space is displayed in the 1st column. Expand the font.

Figures 7 (1) and (2) show the video memory 6 and actual CRT display when fonts are expanded in the first column for the second row and below in the display state of No. 6@I (2) above. This is a diagram showing the correspondence relationship with the screen, (1) is the video memory 6, (2)
indicates an actual CRT display screen.

As shown in FIG. 7(1), the display address of the first column of the second row is (X-N, Y+1).

Therefore, at this address position (position ■), the characters
Expand the font and write the address (X-N, Y+2) in the 1st column of the 3rd row, and (X-N, Y) in the 1st column of the 4th row in the same way.
+3) ,..., respectively, the letter ゛'ko'',
The fonts are expanded sequentially.

Thereafter, similarly, the characters arranged in six columns of each row are sequentially expanded into fonts at the position (■) of the first column of the next row.

Through such processing, as shown in FIG. 7 (2),
A display screen is obtained in which the number "1" is inserted between "A" and "I" on the first line.

As shown above, when inserting one character into a line consisting of
For image data of characters whose arrangement order is the same as before insertion, simply change the display start address and perform block transfer. All you have to do is expand the font.

The following FIG. 8 is a flowchart showing the flow of font development processing when one character is inserted into the first line character string in the high-speed font development method of the present invention. In the drawings, #1 to #5 indicate steps.

As already mentioned, in the display state shown in Figure 3 (1),
When the number It I I+ is inserted between "A" and "I" in the first line by the editing process, a new display address is calculated by the circuit shown in FIG.

In the display state of Figure 3 (1), the display start address is locus II (X, Y), and the characters "A" and "" on the first line
When inserting the number "1" between "1" and "1", a new display start address is required. In this case, the coordinates (X-N, Y) are calculated.

In step #1 of the flowchart of FIG. 8, the display start address is changed to the left by one character based on this new address information. That is, as shown in step #1 of FIG. 8, the coordinates are (x, y)→(X-N, Y).

Through this process of changing the display address, the display address shown in Fig. 3 (
The image data on the video memory 6 of 1) is shown in FIG.
As in 1), it changes instantly.

In the next step #2, the character "A" is developed in font at the space display position of the first line, that is, the address (X-N, Y). Image data of the character "A" is developed at position ■' in FIG. 6(1).

In the next step #3, the second column of the first row, i.e. the position ■
Expand the numbers II I II.

By processing steps #2 and #3, the position
The character "A" is developed at the position ``, and the number n 1 +t is developed at the position ■, and the display screen changes as shown in FIG. 6(2).

In step #4, for the first column, the position of the second row ■
, expand the letter ``o''.

In this state, the image data on the video memory 6 is
As shown in FIG. 7(1), the position (2) in the first column of the second row, that is, the start address, is the coordinate (X-N, Y+M).

In step #5, the corresponding characters are expanded into fonts only for the first column in the same manner. In other words, at the address (X − N, Y + n M) of the first column,
The fonts are expanded sequentially.

In this state, the image on the video memory 6 contains the characters "ko" and "ko" only in the first column position, as shown in FIG.
``So''... is expanded into a font.

When this process is repeated until the last row, the eighth
When the flow shown in the figure is completed, a display screen corresponding to the editing process is obtained as shown in FIG. 7(2). In other words, display processing when one character is added to the beginning of a line is quickly executed.

In the embodiment shown in FIG. 4 and the embodiments shown in FIGS. 5 to 8, the case where only one character is added at the beginning of a line or between characters has been described in detail.

However, it is not limited to one character, but it is also possible to add a plurality of characters (n characters), and the processing in this case is basically the same as that for one character.

Furthermore, in the above embodiment, one or more characters are added to the beginning of the first line or between characters.

However, not only in the case of the first line mentioned above, but if one or more characters are added to the beginning of any line from the second line onward, one or more characters may also be added to the beginning of any line from the second line onward. It can be implemented in the same way even when adding .

First, the process for adding (inserting) one character to the beginning of the second line will be described.

Figures 9 (1) to (3) show the correspondence between the video memory 6 and the actual CRT display screen when adding one character to the beginning of the second line at the time of editing in the high-speed font expansion method of the present invention. In the figure shown, (1) is the video memory 6, (
2) and (3) show actual CRT display screens (CRT display memory). The symbols in the drawings are the same as in Figure 2,
Also, ■ indicates the position of a character to be added, and ■ indicates the position of a character newly expanded in font to the image data.

As shown in FIG. 9(1), on the video memory 6,
Assume that a character string has been created, and the data in the display area 6a surrounded by broken lines is output and displayed on the CRT screen.

In this display state, it is assumed that an editing operation is performed and a new English character ``'B'' is added to the beginning of the second line (position ■) of the already created character string.

In the high-speed font expansion method of this invention, as in the case of FIG. 4, the entire display area is first expanded.

Scroll to the left by one character and set the area 6a/ surrounded by the solid line as a new display area.

Therefore, on the CRT screen, as shown in Figure 9 (2),
The first column will be a space, and the second to fifth columns will display the image data of the characters that were displayed in the first to fourth columns before scrolling.

First, in the first line (1) of FIG. 9, that is, the top line, the display start position is shifted to the left by one column, and the image data of the character "AIUEO" in that line is transferred as a block.

Next, in the first column of the second row (position ■), expand the font of the newly added character II B y), and below, part 3
Starting from the first column of the row (position ■), "here", "so..."
Develop the font for each character of and ″.

Therefore, as shown in FIG. 9(3), a display screen is obtained in which the English letters II B jj are added to the beginning of the second line (position ■).

In this case, the processing time is the time to transfer the characters "AIUEO" in the first line, and the time to transfer them to the 1st to 4th columns before scrolling in the 2nd line and below, that is, the rectangular image area (columns 2 to 5 after scrolling). , and the font development time of the first column (from position ■ to position ■), that is, the left end portion.

Further, the process for adding (inserting) one character between the characters in the second line is as follows.

Figures 10 (1) and (2) are diagrams showing examples of CRT display screens when adding one character between characters in the second line during editing in the high-speed font development method of the present invention.
1) shows the CRT display screen before editing, and (2) shows the CRT display screen after editing. In the drawing, ■ indicates the insertion position of the added character.

As shown in FIG. 10 (1), by editing operation,
Add the alphabetic character II G 4' to the position ■ of the second row and second column, that is, the position where the image of the single character "K" is currently displayed, to create a character string as shown in Figure 10 (2). Suppose you want to change it.

Figures 11 (1) to (4) explain the order in which character strings on the video memory 6 are changed when one character is added between characters in the second line at the time of editing in the high-speed font expansion method of the present invention. It is a diagram. In the drawing, ■ indicates the insertion position of the added character, and ■ to ■ indicate the position of the newly developed character.

As shown in Figure 10 (2), at position ■ in the second row and second column,
In the process of adding the alphabetic character II G Hl, the display start address on the video memory 6 is moved one character to the left, and the first column is all displayed with spaces, as shown in Figure 11 (1). be done.

Next, the character string "AIUEO" in the first line is moved one character at a time to the left by block transfer, and the image data is arranged as shown in FIG. 11(2).

Furthermore, as shown in Fig. 11 (3), the image of the character "K" is developed in font at the position ■ of the second row and first column, and the image of the English character II CI+ to be added is placed at the right position ■. The font is expanded.

Next, in the 3rd row and 1st column of Fig. 11 (4), that is, the leftmost column (position ■), write ``ko'', ``so'', '', and '' in order from the top.
Develop each character in the font.

When this process is repeated until the last line currently displayed, image data with the English character at Cu added to the second column of the second line, as shown in No. 11@(4), is obtained. It will be done.

By creating image data arrayed as shown in FIG. 11 (4) on the video memory 6, an image of a character string as shown in FIG. 10 (2) is displayed on the display screen. It turns out.

In addition, as mentioned above, at the beginning of the second line or between the characters,
It goes without saying that the process for adding one character is the same even when adding one character at the beginning of the third or subsequent lines or between characters.

Additionally, the process for adding only one character at the beginning of the second line or between the characters is the same as for adding multiple characters, and can be easily executed by simply changing the display start position. can do.

Furthermore, the same applies not only to adding one character or n characters but also to deleting one character or n characters.

For example, in the display state shown in FIG. 3 (1) above, when deleting the character "A" in the first column of the first row, the new display area 6a'
Move in the opposite direction to the left.

That is, in the display state of FIG. 3 (1), change the display start address from (x, y) to (X+N, Y), and in the case of this display example, make the new 5th column full space, Thereafter, only the characters in the first column from the second line onward are sequentially expanded into the font in the last column (fifth column) one line before.

The same goes for deleting the character 1'' in the 2nd column of the 1st row.
In the display state shown in Figure 3 (1), enter the display start address (
X, Y) to (X+N, Y), and for the first line, expand the font of the character “A” in the first column, and from the second line onwards, change the characters in the first column to that first line. Previous last column (5
Expand the font to column (column).

As shown above, even when deleting one character (n characters),
The number of characters that require font development is extremely small compared to conventional methods.

As already mentioned, in the above embodiment, the case where the character string for one line displayed on one screen is five digits has been described.

However, on an actual CRT screen, one line of character string displayed is
For example, the number of characters that can be displayed on one screen is extremely large compared to the embodiment, such as 40 to 60 digits and 20 to 40 display lines.

Therefore, the number of characters added by editing operation is 1
The number of characters in the display area for which image data can be transferred using the bit blit function, even if there are n characters such as 2 to 4 characters, is limited to characters that require font development. It is clear that the number is significantly larger than the actual number.

As described above in detail, the present invention includes an input device, a display device, a text memory that stores data such as edited characters and symbols, and a character pattern memory that stores pattern data such as characters and symbols. , a video memory in which font-expanded image data is stored;
font development means for storing the data stored in the text memory as image data in the video memory according to the pattern data stored in the pattern memory, and displaying the edited character string as image data on the screen of the display device. When displaying on the screen, in a conventional data processing device having a function of bit blit transfer from the video memory to the display memory, when editing processing such as adding or deleting the character string displayed as image data on the screen, , an order-unchanged image data area detecting means for detecting an image data area in which the order of character strings on the video memory is not changed even after an editing operation, based on the added/deleted characters and their position information; change area detection means for detecting a display area in which the image data on the memory is changed; and when a character string on the screen is added or deleted by an editing operation, the order non-change image data area detection means is provided. detecting an image data area on the video memory whose order is not changed, bit-blit transferring the image data of the area to a display memory, and detecting a display area where the image data is changed by the change area detection means; Only in this display area, the changed characters are developed into image data and displayed by the font development means.

- According to the high-speed font development method of this invention, even if the screen layout changes due to the addition/deletion of characters during editor operation, font development is performed only for the image data area where the arrangement order of character strings has changed. For other display areas, image data for the entire display screen can be obtained at high speed by bit-blit transfer. Therefore, the processing time is significantly reduced compared to the conventional method in which font development must be performed on the image data of the entire screen every time a character is added/deleted.

Therefore, high-speed editor processing becomes possible and operational efficiency is significantly improved, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing an example of the configuration of essential parts of a data processing device for implementing the high-speed font expansion method of the present invention. Figure 2 shows the video memory and CR in the data processing device.
A memory configuration diagram explaining the relationship between the T display areas, and FIG. 3 is a diagram showing the correspondence between the video memory and the actual CRT display screen in the case of normal font development.
(1) is the video memory 6, (2) is the actual CRT display screen, and FIG. 4 is the high-speed font expansion method of the present invention.
This is a diagram showing the correspondence between the video memory 6 and the actual CRT display screen when adding one character to the beginning of a line during editing. (1) is the video memory 6, and (2) and (3) are the actual CRT display screens.
RT display screen (CRT display memory), Figures 5 (1) and (2) show the video memory 6 and the actual display when adding one character between character strings at the time of editing in the high-speed font development method of this invention. This is a diagram showing the correspondence relationship with the CRT display screen, in which (1) is the video memory 6, (2
) is the actual CRT display screen, and Figure 6 (1) and (2) are
This is a diagram showing the correspondence relationship between the video memory 6 and the actual CRT display screen when the font is developed on the first line in the display state shown in FIG. 5 (2).
2) is the actual CRT display screen, and Figure 7 (1) and (2) are the display conditions of Figure 6 (2) above, and the fonts for the 1st column of the 2nd line and below are expanded. FIG. 8 is a diagram showing the correspondence between the video memory 6 and an actual CRT display screen, in which (1) is the video memory 6, (2) is the actual CRT display screen, and FIG. 9 (1) to (3) are flowcharts showing the flow of font expansion processing when inserting one character into the character string in the first line. (1) is a diagram showing the correspondence relationship between the video memory 6 and the actual CRT display screen when adding one character to the beginning of a line.
2) and (3) are the actual CRT display screen (CR1 display memory), and Figure 10 (1) and (2) are the high-speed font development method of this invention that shows one character between the characters on the second line when editing. This is a diagram showing an example of a CRT display screen when adding (
1) is the CRT display screen before editing, (2) is the CRT display screen after editing. FIG. 12 is a functional block diagram showing an example of the main configuration of a data processing device having a conventional font expansion function; FIG. The figure is a diagram for explaining the operation of character font development during screen scrolling in a data processing device having a conventional font development function. (1) is an example of the video memory and the characters in its display area before scrolling. ,
(2) is a diagram showing an example of a display screen after scrolling. In the drawing, 11 is a current display start address register, 12 is a change address calculation circuit, 13 is a new display start address register, 14 is a display change area calculation circuit,
15 is a text extraction circuit. Patent applicant Ricoh Co., Ltd. 2 Figure 3 Monument 4 Miban 5 (2) Monument 6 Figure 9 Figure 10 Figure 11 Dano 13 Figure

Claims (1)

[Claims] An input device, a display device, a text memory that stores edited data such as characters and symbols, a character pattern memory that stores pattern data such as characters and symbols, and a video that stores font-developed image data. font development means for storing the data stored in the text memory as image data in the video memory using the pattern data stored in the pattern memory; Editing, such as adding or deleting, to a character string displayed as image data on the screen in a data processing device having a function of transferring bits from the video memory to the display memory when displaying on the screen of the display device. Non-order change image data area detection means for detecting an image data area in which the order of character strings on the video memory is not changed even after an editing operation, based on the added/deletion characters and their position information during processing; and change area detection means for detecting a display area in which the image data on the video memory is changed, and when a character string on the screen is added or deleted by an editing operation, the out-of-order detection means is provided. The changed image data area detecting means detects an image data area on the video memory whose order is not changed, the image data of the area is bit-blitz transferred to the display memory, and the changed area detecting means displays the image data changed. A high-speed font development method, characterized in that an area is detected, and changed characters are developed and displayed as image data by the font development means only for the display area.