JPS61116386A - Character pattern writing control 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 [Field of Industrial Application] The present invention relates to a control system for writing a character pattern into a display memory in displaying characters composed of character patterns made up of dots.

2. Description of the Related Art In order to display Chinese characters and other characters on a cathode ray tube display device or print them on paper, a system in which the characters are formed by an array of predetermined shaped dots (these are called dots) is widely used.

In one system of such a device, for each character,
It has a character pattern that represents the do-no-do structure of a certain standard character shape as bit string data, and when displaying a character, it displays one dot at a time in a predetermined area on the display memory, referring to the character pattern as the original form. A character pattern is written, and the control section of the display device displays the contents of the display memory as is in correspondence with \dots.

When writing dots to the display memory, in addition to cases in which the original character pattern is transferred as is, there are cases in which the character pattern is converted and written so that it can be enlarged and displayed.In the latter case, the original character pattern is For one dot of the pattern,
Since it is necessary to write a plurality of dots into the display memory, it is necessary to speed up the display memory writing process, especially in the latter case, in order to display at high speed.

[Prior art and problems to be solved by the invention] FIG. 2 is a block diagram showing an example of the configuration of a display system.

The storage device 1 stores data such as documents, character patterns, and if necessary, programs and other control information.

The processing device 2 reads the required information from the storage device 1,
Characters in a document or the like to be displayed are sequentially extracted, and the character pattern of the characters is read out from the storage device 1.

Next, a display character pattern is written into the display memory 3 according to the character pattern. The reference point of the address on the display memory 3 to be written at this time is determined by the document data.

The display device 4 is a so-called dot printer or a cathode ray tube display device capable of displaying dots, and outputs a display according to the contents of the display memory 3. For example, in the case of a printer, a black dot is output when the bit is "1", and a white dot is output when the bit is "0", depending on the bit in the display memory.

FIG. 3 (al) shows an example of a character pattern using the kanji character ``character'' as an example; each square corresponds to one dot, and the numbers are bit values representing that dot.

When displaying, for example, a quadruple-width character (twice the width and height) using such a character pattern as its original form, it is necessary to enlarge one bit of the character pattern to four dots in the display memory.

Therefore, as shown in Figure 3 (bl), the character pattern °1"
The display memory stores A-B-C- corresponding to each bit of
Write 4 ゛1゛ bits like ゛.

Similarly, in the case of “0”, four “0” dots are located as shown in E-F-G-11, but if the display memory 3 is cleared to “0” in advance, or In many cases, such as when overwriting information in the address, it is sufficient to simply advance the address without actually writing.

FIG. 4 is a diagram showing an example of the flow of the display character pattern writing process as described above.

In step 10 of the process, a character pattern is read from the storage device l, and in step 11, various control variables necessary for the following process are initialized.

In step 12, one bit of the character pattern is extracted and inspected. Assume that the character pattern is processed, for example, starting from the upper left bit (25 in FIG. 3 (al)), moving to the right, and sequentially moving downward line by line.

If the bit is °1", proceed to step 13, write the "1" bit to the display memory 3, and then write the bit °0'.
If so, proceed directly to step 14.

In step 14, it is determined whether it is necessary to update the dot address in the display memory 3 in the vertical direction (Fig. 3 (from BL 8 to B direction)), and if necessary, it is updated in step 15 and the process loops to the steering knob 12. .

If there is no address update in the vertical direction or if the processing has already been completed a predetermined number of times, in step 16 the address is updated in the horizontal direction (see Figure 3).
Update the address of bl from B to C) and proceed to step 1.
At step 7, it is determined whether the processing for one bit of the character pattern has been completed, and if it has not been completed, the process returns to step 12.

When the processing for one bit on the character pattern is completed, it is determined in step 18 whether the processing for the current character pattern has been completed, and if it is not completed, in step 19 the address of the check bit of the character pattern is set to the next focus address. , and return to step 12.

When processing of one character pattern is completed, proceed to step 10.
to begin processing the next character.

As has been made clear from the above explanation, in conventional processing, even in the case of the °0' bit of a character pattern, which does not require writing to the display memory, it is used for display in the same way as in the case of the °1' bit. Since memory dot address update processing is performed, there is a problem in that processing time is wasted.

[Means for solving problems]

The problem described above is that when a character has a character pattern consisting of dots that constitute a character, and when writing the display character pattern to the display memory dot by dot according to the character pattern, the dots are not written to the display memory. Address calculation is solved by the character pattern writing control method of the present invention, which is configured to omit part of the dot address calculation when writing dots.

[Effect]

That is, in processing the 0" bit of a character pattern that does not require writing to the display memory, the dot address calculation only requires obtaining the first dot address in processing the next bit of the character pattern. Therefore, the system is configured so that unnecessary calculations can be omitted.

With this configuration, in Figure 3 (in the BLO example), the dot address advances directly from point E as E-G-, 1, and
Processing speeds up because the process does not go through points.

〔Example〕

FIG. 1 is a flowchart of processing in an embodiment of the present invention.

Read the character pattern in step 10, and step 11
After performing the necessary initial settings in step 20, one bit of the character pattern is inspected in step 20.

When the checked bit is 1, the processing from step 13 onwards is carried out as in the conventional case.

If the checked bit is 0, according to the present invention, the process of updating the dot address in the display memory in the vertical direction is omitted and the process directly proceeds from step 20 to step 16.

Therefore, when the bit of the character pattern is 0, the update of the dot address in the horizontal direction is repeated the required number of times, and processing can immediately proceed to the inspection of the next bit of the character pattern.

〔Effect of the invention〕

As is clear from the above description, the present invention has a significant industrial effect of speeding up the character pattern writing process for displaying enlarged characters on various display devices.

[Brief explanation of drawings]

Fig. 1 is a flowchart of processing according to an embodiment of the present invention, Fig. 2 is a block diagram of an example of the configuration of a display system, Fig. 3 is an explanatory diagram of character patterns, etc., and Fig. 4 is a flowchart of conventional processing. . In the figure, 1 is a storage device, 2 is a processing device, 3 is a display memory, 4 is a display device, and 10 to 20 are processing steps. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] When writing a display character pattern to the display memory dot by dot according to the character pattern, when dots are not written to the display memory, the dot address calculation is as follows: A character pattern writing control method characterized in that the character pattern writing control method is configured to omit a part of dot address calculation when writing.