JPS6347793A - Buffer management system for image display device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Conventional technology Problems to be solved by the invention Means for solving the problems (Fig. 1) Working example (a) One example Explanation (Fig. 2) (b) Description of other embodiments Effects of the invention (Summary) The first processor writes image data to the image data storage buffer, and the second processor reads out the written image data. In an image display device that performs display processing, image data is divided into blocks and written, and a display completion flag is provided for each block.
The two processors perform write control so that both processors can operate in parallel.

[Industrial application field]

The present invention relates to a management method for an image data buffer provided between a pair of processors in an image display device capable of displaying images such as characters, figures, images, etc. on the same screen.

In recent years, bitmap displays that can display characters, figures, and images on the same screen have been widely used.

Such bitmap displays are required to have highly functional operations such as a multi-window function, and accordingly, high-speed data wls processing and display processing are required.

[Conventional technology]

A conventional image display device includes a first processor 1 for editing and a second processor 3 for display, as shown in FIG. 3(A).
The memory 2 is provided with a command #MJjA2a for storing commands and an image data buffer 2b for storing image data.

A bitmap memory 4 is connected to the second processor 3, and the contents of the bitmap memory 4 are displayed on a display 5.

As shown in FIG. 3(B), the first processor 1 performs image data editing processing in response to input from a keyboard, tablet left, mouse, etc. (not shown), and stores commands and image data in a command area 2a of the memory 2. and write to the image data buffer 2b. On the other hand, the second processor 3 refers to the memory 2, displays the image data in the image data buffer 2b according to the command in the command area 2a, generates an image pattern corresponding to the image data, and stores it in the bitmap memory 4. By writing, an image pattern corresponding to the image data is displayed on the display 5.

In this way, a type of distributed function configuration in which the first processor 1 performs editing processing and the second processor 3 performs display processing can execute each processing at high speed.

[Problem that the invention seeks to solve]

However, in the prior art, as shown in FIG. 3(B), the first processor 1 uses the image data buffer 2
A problem arose in that the first processor 1 could not perform the next editing process or write operation until the second processor 3 finished displaying the image data written in the image data stored in the second processor 3, making it impossible to achieve higher speed.

An object of the present invention is to provide a buffer management system for an image display device that allows the display processing of the second processor 3 and the editing processing of the first processor 10 to operate in parallel, thereby increasing the speed.

Measures to solve problem C] FIG. 1 is a diagram explaining the principle of the present invention.

In the figure, the same parts as those shown in FIG. 3 are indicated by the same symbols, BD is block image data, and F is a display completion flag provided for each block.

In the present invention, the first processor I writes image data to the image data buffer 2b in units of blocks, and the second processor 3 writes the image data to the image data buffer 2b.
The image data is displayed in blocks,
Upon completion of the display processing of the block BD, the second processor 3 rewrites the display completion flag F of the block in the buffer 2b to indicate completion of display. Furthermore, the first processor 1 refers to the display completion flag F and performs editing and writing of image data.

[Effect]

In the present invention, since the image data is converted into a professional format and a display completion flag F is provided, the first processor 1 can recognize the block that the second processor 3 has completed displaying by referring to the display completion flag F.

Therefore, even if the second processor 3 is in the process of displaying another block, it can edit and write the block that has finished displaying, and the first processor 1 can complete the display process of all image data in the buffer 2b. Editing and writing of image data can be done without waiting, and speeding up can be achieved.

〔Example〕

(a) Description of one embodiment FIG. 2 is a configuration diagram of an embodiment of the present invention.

In the figure, the same parts as those shown in FIGS. 1 and 3 are indicated by the same symbols, and P is a pointer for indicating the next block with respect to block BD.

The first processor 1 writes the image data of each block to the buffer 2b and stores it in the command area 2a. Commands stored in the command area 2a are organized into a command chain.

In accordance with the command indicated in the command area 2a, the second processor 3 reads the blocked image data from the buffer 2b, converts it into an image pattern, and writes it to the position on the bitmap memory 4 specified by the command. .

In the example shown in FIG. 2, the command for the command area 2a is to write to the first line of the focus map memory 4 (WR
I put LINE (1) ', it says to write on the second line (
The ridge device LINE (2) ' is the image data to be written, and the first line is 'ABC'1. The second line is 'DEF
).

Therefore, the second processor 3
(1)) Reads the image data (ABC1) indicated by the pointer P, converts them into character patterns, and writes them to the first line of the bitmap memory 4. As a result, rABcJ is displayed on the first line of the display 5. be done.

When the display processing of one block is completed, the second processor 3 sets the flag F of the block to "1".

Thereafter, the second processor 3 similarly reads the next command from the command area 2a according to the command chain, reads the next block according to the pointer P, and performs display processing.

On the other hand, the first processor 1 confirms that the flag F of the block in the buffer 2b is 1'', and thereby
Other edited image data can be written to the block whose flag F is "1". Along with this writing, the flag F of the current block is returned to "θ" and the corresponding command is stored in the command storage area 2a.

Therefore, the second processor 3 reads the character string rDEF in the second line.
Even during the display processing of J, the first processor 1 can write to the block whose flag F is "1".

At this time, it is not necessary to write the image data of the first line, and this can be set by a command.

In this way, data that has been displayed can be edited even during image data display processing, and display editing can be performed at high speed.

(b) Description of Other Embodiments In the above-described embodiments, character display was used as an example, but images and figures may also be used, and these may be written in blocks.

In addition, not only the WRITE command but also the partial ERASE command,
It may also be a window write command or the like.

Although the present invention has been described above using examples, the present invention can be modified in various ways according to the gist of the present invention, and these are not excluded from the present invention.

〔Effect of the invention〕

As described above, according to the present invention, the first processor and the second processor can be operated in parallel, and the display and editing of characters, graphics, etc. can be speeded up.

Further, it has the effect that it can be realized by simple means of blocking data and setting flags, and is useful in practice.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention. FIG. 3 is an explanatory diagram of the prior art. In the figure, 1--first processor; 2-.-memory, 2a...--1~--Command area, 2b----Image data Basof1. 3--second processor; 4.--Bitmap memory, 5.--Display.

Claims (1)

[Claims] A first processor (1) writes image data to an image data accumulation buffer (2b) of a memory (2), and a second processor (3) writes image data to an image data accumulation buffer (2b) of a memory (2). In an image display device configured to perform display processing on image data, write an image pattern into a bitmap memory (4), and display the contents of the bitmap memory (4) on a display (5), the first processor ( Write the image data from 1) to the image data storage buffer (2b) in blocks, set a display flag in the block, and perform display processing on the block by the second processor (3). After the display processing is completed, A buffer management method for an image display device, characterized in that the display completion flag is rewritten to display completion, and the first processor (1) refers to the display completion flag and writes image data.