JPS63229490A - Character display 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] [Summary] Character attribute data of display characters (corresponding to the first and second logical bars) and a field definition character placed at the first character position of a field to control display within the field. In the character display method that develops the pattern of each character cell based on the logical screen data (logical screen buffer) in which the display attribute data (corresponding to the second logical buffer) and the display attribute data (corresponding to the second logical buffer) are arranged in character string order, Logical screen data is constructed by adding the display attribute data of the character before the field to the character attribute data and field display attribute data, respectively, and the logical screen data is searched for the field display attribute data to which the character cell belongs. This is not necessary and the string can be displayed quickly.

[Industrial application field]

The present invention relates to an improvement in a character display method that controls the display of character strings by providing display attribute data for each character in each field.

Additional patterns such as underline and overline.

In a character display method in which display attributes such as display colors are provided as data for each character and each field on a logical screen, the display attribute data of a field is placed as a field definition character at the first character cell position of that field.

Therefore, when logical screen data is read in the order of arrangement and a display pattern is developed, the logical screen may be searched for the field definition character to which the character cell belongs, resulting in a problem that the display speed becomes slow.

Therefore, there is a need for a character display method that solves this problem and displays character strings at high speed.

C. Prior Art] Fig. 5 is an explanatory diagram of a character display system, Fig. 6 is a diagram showing the contents of a conventional logical buffer, Fig. 7 is a block diagram of a conventional display control section, and Fig. 8 shows that the logical screen is a display screen. It is an explanatory diagram of a display method when the size is larger.

The logical screen consists of logical buffers provided for each character cell, which is the minimum display area, arranged in the order of character strings, in which attribute data of each character cell is stored, read in the order of arrangement, and developed into a pattern.

The character display method shown here is the field definition character (
(corresponds to the second logical buffer that stores display attribute data)
is assigned to the first character cell position of the field, and the character cells up to the next field definition character are defined to belong to that field.

The attribute data of each character cell will be explained below.

FIG. 5 shows logical screen data 50 expressed corresponding to the display screen 60. CAI to CA4 are character attribute data CA (hereinafter individual attribute data, logical buffer) representing attributes of displayed characters. etc., use numbers as subscripts to distinguish them)
, FA1, FA2 are field attribute data FA representing the display attributes of the character cell and the character cells up to the next field definition character, and are stored in the first logical buffer CB and second logical buffer FB, respectively, and are displayed. They are arranged corresponding to the scanning direction (character string) of the screen 60.

As shown in FIG. 6(1), the character attribute data CA is human attribute data (data omitted in the figure)2 display attribute data 51C2 display control attribute data.

The field attribute data FA consists of 6 bytes of character code data (the data areas on the logical buffer are referred to as ATRI~^TR6 in ascending order), and the field attribute data FA is composed of input attribute data I~^TR6 as shown in Fig. 6 (■). and display attribute data 51
It is composed of 6 bytes (ATRI to ATR6) of f,
In particular, display attribute data 51 indicated by ATR2 and ATR3
f, 51C specifies the display of additional patterns such as underground lines, overlines, vertical lines, halftone dots, etc. for the character cell 61;

Therefore, in the character cell 61 corresponding to the character attribute data CA, for example, a character pattern and a specified additional pattern are displayed, and in the character cell 61 corresponding to the field attribute data (for example, FA2), in the right half area 61b, the character pattern and the specified additional pattern are displayed. In the left half area 61a, the additional pattern specified by the display attribute data 51f is applied to the field attribute data placed immediately before (FAI; hereinafter, the immediately previous field attribute data is FAI).
.

The additional pattern specified by the corresponding logical buffer (FBI) is developed and displayed.

Therefore, at least when developing field attribute data A2 into a reading pattern, the immediately previous field attribute data FAI (field definition character) is searched on the logical screen data 50, and its display attribute data 51f1 is referred to.

On the other hand, there is a calculation mode in which field attribute data FAI and character attribute data CAI to CA3 belonging to the field are logically operated (various conditions are set depending on the device, such as logical phase) and displayed.
Each time A3 is read, as described above, the display attribute data FAI of the field placed immediately before is searched, and a predetermined calculation is performed based on the display attribute data 51f1.

A display control unit that displays character strings using the above character display method will be described below.

In FIG. 7, reference numeral 5 denotes a logical screen buffer, and the first and second logical buffers CB and FB each having a 6-byte configuration are arranged corresponding to the character string (scanning direction) on the display screen 60. , the contents of each logical buffer are addressed and read based on the row and number of digits, and 2 is provided with a line pointer 2c and a 1-digit pointer 2b for reading the logical screen buffer 5, and scans and reads out logical buffer units in the order of arrangement to read frames. This is a frame memory control unit that develops a pattern in memory 3, and stores the immediately previous field attribute data F.
When AI is required, it has an FA search unit 2a that searches by reversing the pointer, 3 is a frame memory that performs pattern development, 4 is a display control circuit that outputs the frame memory 3 to the scanning reading display unit 6, ■ is a display processor (display CPU) that controls each part above.
It is.

In the display control section configured as described above, the frame memory control section 2 reads the field or character attribute data FA, CA while incrementing the values of the column and row pointers 2b and 2c, and also reads the field or character attribute data FA and CA. The previous field attribute data FAI is detected by reversing the data, and a predetermined pattern is developed in the frame memory 3 based on each attribute data.

[Problem that the invention seeks to solve]

As mentioned above, the conventional method of retrieving the immediately previous field attribute data each time has a problem in that the display speed is slow.

Therefore, it is sufficient to hold the immediately previous field attribute data in the frame memory control unit, but there are cases where the field attribute data at the origin (upper left corner) of the display screen is placed at the end (lower right corner) of the logical screen. Also, as shown in Figure 8,
If the logical screen data 53 is set larger than the display screen and is scrolled or displayed in a window, the specified position (X1, Y1) and the number of vertical and horizontal characters (number of bytes)
Since the inside of the display area 62 is read by, for example, the field attribute data FAn, FAm immediately before the character attribute data CAn, CAm does not exist in the display area 62, and therefore, searching the logical screen buffer 53 backwards can be avoided. There wasn't.

An object of the present invention is to provide a character display method that solves the above problems and displays characters at high speed.

[Means for solving problems]

For the above purpose, the character display method of the present invention uses the second logical buffer placed immediately before among the plurality of second logical buffers (FB1, FB2''), as shown in FIG.
Display attribute data (51
f1) is stored in the third logical buffer (12).
and the second logical buffer (CB1, CB2.FB2
') respectively to configure a logical screen buffer (13), and each added third logical buffer (12) is added to the first or second logical buffer (CB1, CB2.F
B2) and a frame memory control section that reads the display pattern of the corresponding character cell and develops the display pattern of the corresponding character cell.

[Effect]

The first and second logical buffers (respectively display characters,
When creating logical screen data by adding a third logical buffer 12 to each field definition character (corresponding to a field definition character), the third logical buffer 12 to which display attribute data 51f1 of the field definition character placed immediately before is added. Store in.

When logical screen data is expanded into a reading pattern and displayed, the third logical buffer 12 is read together with the first and second logical buffers as attribute data of the character cell.

Therefore, the display attribute data 51fl of the immediately preceding field definition character is immediately referenced without having to be searched, so that the display speed can be improved.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 2 to 4.

FIG. 2 is a diagram showing the contents of the logic buffer of the embodiment, FIG. 3 is a block diagram of the display control section of the embodiment, and FIG. 4 is an operation flowchart.

FIG. 2 shows the contents of the logic buffer of the embodiment, that is, attribute data for each character cell (1).

As shown in (n), a 2-byte third logical buffer 12 (data areas ATR7, ATR8) is added to the conventional first and second logical buffers that store character attribute data CA and field attribute data FA. Been,
Data area ATR of the previous field attribute data FA1
2, display attribute data 51f1 shown in ATR3 is stored.

As a result, the first and second logical buffers CB, FB
Each has an 8-byte configuration.

Hereinafter, the first and second logical buffers each having an 8-byte configuration to which the logical buffer 12 is added will be distinguished by symbols cb and fb, respectively, and the character attribute data and field attribute data will be distinguished by ca and fa, respectively.

In the block diagram of the display control unit of the embodiment shown in FIG. 3, 7 is a frame memory control unit, in which the first and second logical buffers ca and fb specify a line of the logical screen buffer 13 configured line by line. It is equipped with a line pointer 7C and a digit pointer 7b for specifying a digit, and while advancing these pointers, field attribute data fa and character attribute data e are
10 is an application program provided with display data; 8 is a main CPU which generates and displays a logical buffer based on a request from the application program IO; 14 (Display CP
U1).

Reference numeral 1 denotes a display CPU, which secures a logical screen buffer area for one screen in memory 9 based on a request from the main CPU, and transfers display data specified from an application program 10 to the first and second logical buffers cb, storing each attribute data in a predetermined area of fb, and transcribing the display attribute data 51f1 of the immediately preceding field attribute data fal to data areas ATR7 and ATR8, respectively;
9 is a memory that stores the logical screen buffer 13;
The same reference numerals represent the same objects throughout all other figures.

The display operation will be described below with reference to FIG. 4, taking additional pattern display as an example.

[Creating attribute data]

■ At the request of application program 10, display cpu10
generates a logical screen buffer 13 including first and second logical buffers cb and fb of 8 bytes provided in the memory 9 based on a logical screen creation program (not shown), and based on specified display data, Enter field attribute data fa and character attribute data ca.

(2) Transfer the display attribute data 51f1 of the field placed immediately before to the data areas ATR7 and ATR8.

As described above, the logical screen data in which each character cell has the display attribute data 51f1 of the field placed immediately before is developed in the display control section and displayed in the following manner.

(11) Set the row 1 digit pointer at the starting point of the specified display area, address the predetermined logical buffer, and read the 8-byte attribute data.

(2) Read the type of attribute data written in the data area ATRI and identify whether it is character attribute data ca or field attribute data fa.

(3) If the read attribute data is character attribute data, ■
When calculation mode is specified, ATR7, AT
A logical operation is performed on the display attribute data 51c and 51fl written in R8, ^TR2, and ATR3, and an additional pattern is developed together with the character pattern based on the result.

(2) When not in calculation mode, an additional pattern is developed based on ATR2 and ATR3 (display attribute data 51c).

(4) The read attribute data is field attribute data fa
In this case, based on ATR7 and ATR8, character cell 61
Perform pattern development on the left half area of ATR2, AT
Pattern development for the right half area is performed based on R3.

(5) After the pattern expansion of the character cell 61Q is completed, the column and row pointers 2b and 2c are incremented to perform pattern expansion of the next character cell.

As described above, since all attribute data has the display attribute data 51f1 of the field attribute data fal placed immediately before, there is no need to go back and search the logical screen buffer 13, and the display can be performed at high speed. .

In all of the above explanations, it is assumed that the process returns to the same end point of the logical screen as the previous point at the origin of the logical screen.

〔Effect of the invention〕

As explained above, in the present invention, each attribute data corresponding to a character cell has the display attribute data of the field definition character placed immediately before, so there is no need to go back and search the logical screen data. The effect of being able to display character strings at high speed without any problems is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle of the present invention. FIG. 2 is a diagram showing the contents of the logical buffer of the embodiment, in which (1) is a diagram representing character attribute data, (I1) is a diagram representing field attribute data, FIG. 3 is a block diagram of the display control unit of the embodiment, FIG. 4 is an operation flowchart, FIG. 5 is an explanatory diagram of a character display method, and FIG. 6 is a diagram showing the contents of a conventional logic buffer. ) is a diagram representing character attribute data, (n) is a diagram representing field attribute data, FIG. 7 is a block diagram of a conventional display control unit, and FIG. 8 is an explanatory diagram of a display method when the logical screen is larger than the display area. It is. In the figure, 1 is a display processor (display CPU), 3 is a frame memory, 5 is a logical screen buffer, 6 is a display section, 7 is a frame memory control section, 7b is a digit pointer, 7C is a row pointer, 9 is a memory, 10 is an application program, 12 is an added third logical buffer, 13 is a logical screen buffer, 14 is a display control unit, 61 is a character cell, 50 is a logical screen, 51f is display attribute data of a field, and 51f1 is placed immediately before. 51c is display attribute data of character attribute data, l FB
1, FB2 is the second logical buffer, FBI is the second logical buffer placed immediately before, e==[cBl ~CB
/ is the first logical buffer that stores character attribute data, FA is field attribute data, FAI is the field attribute data placed immediately before, FA2 is the read field attribute data, CA;
CAL to CA4 are character attribute data. Field □□-→ Fig. 1 (1) Diagram representing character attribute data (11) Diagram representing field attribute data Diagram showing the contents of the logical buffer of the embodiment Display control unit block diagram of the embodiment Fig. 3 艷layer 乍Flowchart Figure 4 Figure 5 (1) Figure representing character attribute data (■) Figure representing field attribute data Figure 6 showing the contents of the Kawasaki buffer

Claims (1)

[Scope of Claims] A first logical buffer (CB1, CB2) allocated for each display character and storing character attribute data consisting of character data and display attribute data; allocated for each field definition character; A second logical buffer (FB1, FB2) storing display attribute data (51f) that controls the field between the field definition character and the field definition character placed next is stored for each character cell in the minimum display area. reads the logical screen buffers arranged in the order of character strings provided in In a character display method that controls the display of character cells corresponding to first and second logical buffers (CB1, CB2, FB2) by referring to attribute data (51f1), the second logical buffer placed immediately before The third logical buffer (12) storing the display attribute data (51f1) of (FB1) is transferred to the first and second logical buffers (CB1).
, CB2, FB2) to form a logical screen buffer (13), and each added third logical buffer (12) is added to the first or second logical buffer (CB1, CB2, FB2).
) and a frame memory control unit that reads the display pattern of the corresponding character cell and develops the display attribute data (51f1) of the second logic buffer located immediately before.
) for each character cell.
A character display method characterized by performing display control based on 3).