JPH0462677B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] The present invention is a display device that displays characters in the same character font in a plurality of windows. Two bits of information are provided for each character control information of the buffer, making it possible to perform font fault processing for all windows to be displayed.

[Industrial application field]

The present invention relates to a font processing method in a display device that displays a plurality of windows on a display screen and can independently display characters, etc. within the windows.

When editing a document by displaying multiple windows on a screen and displaying different information in each window, for example, the contents of one principle buffer may be displayed in multiple windows.
At this time, if a portion of the text and the entire text can be displayed in separate windows, the text can be edited efficiently.

[Conventional technology]

Conventionally, the following method has been adopted to display characters on a display device. As shown in FIG. 4, it has a logic buffer 1 that stores character control information and a font memory 2 that stores character fonts, and in addition to these, a control processor 3 that controls this display device, programs, etc. an external storage device 5 that stores character fonts that are not stored in the font memory 2, a display processor 6 that controls display content, a frame memory 7 that stores display content, and a memory 4 that stores character fonts that are not stored in the font memory 2. It consists of a CRT8 for display.

Here, a large amount of character control information is stored in the logic buffer 1, and the character control information 10 for one character is stored in the character code 11 that specifies the character.
, a character attribute 12 that specifies the font of a character, and a 1-bit font fault bit 13 that is used when a font fault occurs.

When actually displaying characters here, the display processor 6 reads the character font from the font memory 2 according to the character code and character attribute of the character control information of the part to be displayed in the logic buffer 1 and displays it. It is. On the other hand, if the character specified by the character control information 10 of the logic buffer 1 is not in the font memory 2, the font fault state is entered, and the display processor 6 sets the font fault bit 13 of the character control information to the ON state, and then writes the character to the font memory 2. Continue displaying the characters accumulated in 2. After the display of the characters stored in the font memory 2 is completed, the control processor 3 reads the character font of the character for which the font font bit 13 is in the ON state from the external storage device 5 and stores it in the font memory 2. , the display processor 6 displays this character. At this stage, the font fault bit 13 of the character control signal 10 is
This process is performed on all characters that have become font faults in the OFF state, and the font fault processing ends.

[Problem that the invention seeks to solve]

By the way, if the above-mentioned font fault processing method in the display device is applied to a display device that displays multiple windows and allows characters, etc. to be displayed independently within these windows, the same character can be displayed in multiple windows. In such a case, if a font fault occurs, the font fault bit in the character control information of the logic buffer will change from the ON state to the OFF state even if font fault processing is executed in any one window. Therefore, if font fault processing is executed in one window, font fault processing will not be performed in other windows that require the same character control information, and the characters will not be displayed. However, it cannot actually be used in a display device that displays multiple windows.

[Means for solving problems]

In the present invention, means for solving the above problems are as shown in FIG.
5, a font memory 16 for storing character fonts, and a logic buffer 18 for storing character control information 17, and the character control information 17 stored in the logic buffer 18 can be displayed on multiple windows with the same character. In a font fault processing method in a display device that reads a character font from the external storage device 15 in the case of a font fault for which there is no character font to be displayed in the font memory 16, the logic buffer is In addition to providing 2-bit information bits 19 and 20 for each character control information, when displaying the character control information 17 of the logic buffer 18 in all windows sequentially, if a font fault occurs, the character control information is One of the information bits 19 out of the 15 information bits is turned on, and after the above display is finished, the one information bit 1 is turned on for each window.
The character font of the character for which 9 is in the ON state is read from the external storage device 15 and the font memory 1
Character information 1 transferred to 6 and displayed and displayed
Turn on the other information bits 20 of 8, execute this operation for all windows, and after the display on all windows is completed, set the other information bits 19 of the character control information 17 on the logic buffer 18 to the ON state. The first information bit 19 of the character control information 17, which is in the ON state, is turned OFF.

[Effect]

According to the present invention, two information bits are provided for each character control information of the logic buffer, and when a font fault occurs, one of the information bits of the character control information is turned ON. After the above display is completed, the character font of the character for which the first information bit is ON is read from the external storage device and transferred to the font memory for each window, and the character information displayed is transferred to the font memory and displayed. Set other information bits to ON state, execute this operation for all windows, and after displaying in all windows is completed, the character whose other information bits are set to ON state among the character control information on the logical buffer The first information bit of the control information
Since it is set to OFF state and the same processing is executed for all windows, font fault processing can be executed for all windows.

〔Example〕

Hereinafter, an embodiment of a font fault processing method in a display device according to the present invention will be described.

1 to 3 show an embodiment of a font fault processing method in a display device according to the present invention. In this embodiment, the display device has a logic buffer 18 storing accumulated character control information and a font memory 16 storing character fonts, as shown in FIG.
A control processor 21 that controls this display device, a memory 22 that stores programs, etc., an external storage device 15 that stores character fonts that are not stored in the font memory 16, a display processor 23 that controls display contents, and a display processor 23 that stores display contents. frame memory 24, and CRT2 that actually displays characters, etc.
It consists of 5.

In this embodiment, it is assumed that two windows can be displayed simultaneously on the CRT 25. Further, in this embodiment, each character control information 17 of the logic buffer 18 includes a character code 26 that specifies a character, a character attribute 27 that specifies the font of the character, a font bit 19, and a flag 20. Information bits are provided.

Next, the case where characters are displayed on this display device will be explained. In this case, two windows, ie, one window and the other, are displayed simultaneously on the CRT 25 to display the character data accumulated in the logic buffer 18. The contents of the display are shown in FIG. That is, the windows 30 and 31 are assumed to display overlapping portions in the area in which the character control information of the logical buffer 18 is stored. For the sake of simplicity, let us assume that the overlapping parts are a, b, c, and d, and the letters ``a'', ``i'', ``u'', and ``e'' will be placed in these parts, respectively, as shown in Figure 2. Assume that it is stored.

When display starts, the display processor 23 first refers to the character information stored in the logic buffer 18 in the font memory 16 and displays it in the window 30.
will be displayed as characters. Here, it is assumed that the character "u" does not exist in the font memory 16 and a font fault has occurred. Then the display processor 23
turns on the font fault bit 20 of the character control information for the character "U". Next, the control processor 23 continues displaying the window 30,
When this is finished, the window 31 continues to be displayed.

The character "U" that overlaps with the window 30 in the middle of this display does not exist in the font memory 16,
A font fault occurs. Then, the display processor turns on the font fault bit 20 of the character control information for the character "U". Further, assuming that the new character "O" does not exist in the font memory 16, the display processor 23 turns on the font font bit 19 of the character control information for the character "O". The control processor 23 then continues displaying the window 31. window 31
When the display of
The character font of the character "U" which has become ON is taken out from the external storage device 15 and the font memory 16
Store in. Then, the display processor 23 turns on the plug 19 and displays the character "u" on the CRT using the stored character font.

When the display of the window 30 is completed, the display processor 23 next displays the font fault of the window 31. In this case, as in the case described above, the character fonts of the characters "U" and "O" for which the font font bit 20 is in the ON state are taken out from the external storage device 15 and stored in the font memory 16. Therefore, the display processor 23 turns on the plug 19 and displays the characters "U" and "O" on the CRT using the stored character font.
Display.

When all the windows have been displayed, the display processor 23 selects the font fault bit 20 of the character control information whose flag 19 is in the ON state among the character control information 17 in the logic buffer 18.
and flag 19 are turned off, and the font fault processing is ended.

Therefore, according to this embodiment, even if a plurality of windows are displayed for one logical buffer, font fault processing can be executed in each window.

〔Effect of the invention〕

As explained above, according to the present invention, the font fault method in the display device is such that 2 bits of information are provided for each character control information of the logical buffer, and when a font fault occurs, the character control information is One of the information bits is turned on, and after the above display is finished, the character font of the character whose one information bit is turned on is read from the external storage device and stored in the font memory for each window. Transfer and display, turn on the other information bits of the displayed text information, execute this operation on all windows, and after the display on all windows is finished,
Among the character control information on the logical buffer, the above-mentioned one information bit of the character control information is set to OFF state while the other information bits are set to ON state.
Even when a plurality of windows are displayed for one logic buffer, font fault processing can be executed in each window.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of the present invention, FIG. 2 is a diagram showing an embodiment of a font fault processing method in a display device according to the present invention, and FIG. 3 is a diagram showing the characters of the embodiment shown in FIG. 2. A diagram showing control information, FIG. 4, is a diagram similar to FIG. 2 showing a conventional technique. 14... Information bit, 15... External storage device,
16... Font memory, 17... Character control information, 18... Logic buffer.

Claims (1)

[Claims] 1. An external storage device, a font memory for storing character fonts, and a logical buffer for storing character control information, and the character control information stored in the logical buffer can be stored in multiple windows. The display device reads the character font from the external storage device into the font memory and displays it in the font fault state where there is no character font to be displayed in the font memory. In the processing method, two information bits are provided for each character control information of the logic buffer, and when displaying the character control information of the logic buffer sequentially in all windows, if a font fault occurs, the above characters are One of the information bits in the control information is turned on, and after the above display is finished, the character font of the character whose one information bit is turned on is read from the external storage device for each window. Transfers to font memory and displays other information bits of the displayed character information.
ON state, execute this operation for all windows, and after the display in all windows is completed, the above one character control information whose other information bits are ON state among the character control information on the logical buffer. A font fault processing method in a display device characterized by turning off information bits of the display device.