JPS63273894A - Display control - 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 <Industrial Application Field> The present invention relates to a display control method, particularly in a display system equipped with two or more screen memories that store overlay images in addition to a screen memory that stores graphic images. This invention relates to a display control method.

<Prior Art> As shown in FIG. 5, a graphic display is provided with a screen memory 1 for storing graphic images and a screen memory 2 for storing overlay images (for example, character images, character cursors, pop-up menu images, etc.). If these images overlap, for example, the overlay image is drawn with priority, so that the respective images are combined and drawn on the CRT.

<Problem to be solved by the invention> However, conventionally, only one overlay screen is provided, so if the graphic cursor is stored in the overlay screen memory, the graphic cursor will move when scrolling the overlay image (for example, a character image). On the other hand, if the graphic cursor image is stored in the graphic screen memory to prevent it from moving during scrolling, a graphic image must be generated every time the graphic cursor is moved and the contents of the graphic screen memory must be rewritten. However, there is a problem that the processing becomes difficult and the screen flickers.

Also, when displaying a pop-up menu image, save the overlay image that was displayed as a joint name in another storage area, then store the pop-up menu image in the overlay screen memory and draw it on the display screen, When a pop-up menu image is no longer needed, it is necessary to save the image and restore it to the overlay screen memory for drawing, which poses a problem in that the processing becomes difficult.

From the above, it is an object of the present invention to eliminate the movement of the graphic cursor when scrolling character images, eliminate flickering of the screen, and further improve operating efficiency by eliminating the need to save the original overlay image when displaying a pop-up menu image. The purpose of the present invention is to provide a display control method that allows for efficient display control.

〈Means for solving problems〉 FIG. 1 is a block diagram of an embodiment of the method of the present invention.

11 is a display processor, 12 is a graphic screen memory, 13 is a first overlay screen memory, 14 is a second overlay screen memory, 15 is a timing signal generation circuit, 16 is an overlay control section, and 17 is a cathode ray tube (CR).
T).

Function> Display processor 11 generates a graphic image and stores it in graphic screen memory 12, and also generates first and second overlay images and stores them in first and second overlay screen memories 13 and 14, respectively. .

Overlay control section 161. In the area where the images synchronously read out from the screen memories 12 to 14 overlap, the image with the highest priority is output to the CRT 17, thereby creating an image formed by overlapping the graphic image and each overlay image. is drawn on the CRT screen.

<Example> =3- FIG. 1 is a block diagram of an embodiment of the method of the present invention.

11 is a display processor configured with a microcomputer;
A graphic image is generated based on image data, a character image is generated based on character code data, and a cursor, pop-up menu image, etc. are generated and stored in a predetermined screen memory. 12 is a graphic screen memory for storing graphic images, 13.14
are first and second overlay screen memories that store overlay images, respectively; 15 is an overlay screen control flag;
16 is a timing signal generation circuit that generates a vertical synchronization signal, horizontal synchronization signal, etc.; 17 is a superimposition control unit that superimposes and outputs images stored in each screen memory based on priority; and 18 is a cathode ray tube ( CRT).

The overlay image flag 15 is a 2-bit overlay flag bit OLF 1°0LF as shown in FIG.
2, and this overlay flag bit 0LFI, 0L
Turn on the display of the first and second overlay images for each screen by F2 (OLFi = II I I+),
The display can be turned off (OLFi="O").

The screen memory 12 has one storage area corresponding to each picture element on one screen, and the three bits of this storage area are filled with red, blue, blue, and red, respectively.
It is designed to memorize the presence or absence of the green color component (1'' is present, °'0'' is absent). Also, screen memory 13.14
Similarly, it has one storage area (see FIG. 2(b)) corresponding to each picture element, and the three pits (color bit CLB) of this storage area
) stores the presence or absence of red, blue, and green color components, respectively, and the overlay bit OLB displays whether the main picture element, that is, the picture element of the overlay image, is displayed with priority over the picture element at the same coordinates of the graphic image. ("1") or display/display off information indicating whether the picture element of the overlay image is not displayed ("θ") is stored.

Note that the overlay control flag 15 turns on the display of both the first and second overlay images (OLFI="1", 0L
F2="1"), the second overlay image has a higher display priority. Therefore, the first, second
If both overlay images are set to display on, and "1'' is set in the overlay bit OLB of a picture element in the first and second overlay images, then the picture in the second overlay image The element will be displayed.

FIG. 3 shows the image control flag 0LFl of each overlay image,
For all combinations of 0LF2 and overlay pit OLC for each pixel of each overlay image, which image pixel is displayed on the CRT is shown.

The superimposition control unit 16 outputs the picture element with the highest priority to the CRT 17 in accordance with the diagram of FIG. An image formed by superimposing a graphic image and each overlay image is drawn on the CRT screen.

The overall operation of FIG. 1 will be explained below.

As shown in FIG. 4, the display processor 11 stores the graphic image GIM in the graphic screen memory 12, and stores the character image CTM and character cursor CCS.
(first overlay image) is stored in the first overlay screen memory 13, and the graphic cursor GC8 and pop-up menu image PUM (second overlay image) are stored.
is stored in the second overlay screen memory 14.

Note that the display processor 11 sets the overlay flag 0 of the overlay image flag 15 depending on whether to turn on or turn off the display of the first overlay image on a screen-by-screen basis.
Set LFI to "1" or +0, and set overlay flag 0LF2 to "1" or 2' depending on whether to turn on or off the display of the second overlay image on a screen-by-screen basis.
0''. Also, as shown in the chart shown in FIG.
T18 and (11) the overlay bit +1'' or +0° is determined depending on each picture element based on the on/off state of overlay flags 0LFI and 0LF2.

Each of the screen memories 12 to 14 is provided with an image reading section (not shown), and each image reading section reads data from each screen memory in synchronization with the beam scan of the CRT based on a timing signal input from the timing signal generation circuit 16. The image is read for each picture element and input to the superimposition control section 17. or,
The overlay control section 17 has an overlay image control flag 15.
The first and second overlay flag pits 0LFI, 0
LF2 is applied.

When the overlay control unit 17 receives picture element data (3 bits of color information and 1 pit of overlay pit information) for each picture element from the screen memories 12 to 14 in synchronization with the scanning of the beam, the image shown in FIG. Color information included in pixel data of a predetermined image among the graphic image or the first and second overlay images is output based on the chart shown. For example, (i) If OL F 1 = "O", 0LF2 - "0", the picture elements of the graphic image are output regardless of whether the overlay bits of the first and second overlay images are on or off, and ( ii) OL F 1-"1",0LF2-"O'"
and the overlay bit OLC of the first overlay image
If is '0', output the picture element of the graphic image,
Overlay bit OLC of the first overlay image is “1”
If so, output the picture element of the first overlay image, (iii) OL F 1 = “O”, 0LF2 = “1”
”, and the overlay bit OL of the second overlay image
If C is 11011, the picture element of the graphic image is output, and the overlay bit OLC of the second overlay image is +
1", outputs the pixel of the second overlay image, (iψ0LF1-"1", 0LF2="1°1, the overlay bit OL of the first and second overlay image
If C is both 11011, the picture element of the graphic image is output, and the overlay bit of the first overlay image is "1".
', if the overlay bit of the second overlay image is "0", the picture element of the first overlay image is output, and if the overlay bit of the second overlay image is "1", it is related to the overlay bit of the first overlay image. The picture elements of the second overlay image are output instead.

When image data is input from the superposition control section 17, the CRT 18 performs brightness modulation control based on the image data.
As a result, an image formed by superimposing the graphic image and each overlay image is drawn on the screen.

Therefore, as shown in FIG. 4, the graphic image GEM is stored in the graphic screen memory 12, and the character image CIM
and character cursor CC8 to the first overlay screen memory 1
3, the graphic cursor GC3 is stored in the second overlay screen memory 14, the overlay flags 0LF1.0LF2 are turned on ("1"), and the overlay pit OLC is a storage area that stores each character and cursor image part. 11111, (1) a graphic cursor, (11) a character that does not overlap with the graphic cursor, and a graphic image that does not overlap with the character cursor and each 6j1 cursor and character are respectively drawn on the display screen.

If the character image is scrolled in this state, the character image and the character cursor are scrolled together, but the graphic cursor is not moved.

Furthermore, even when moving the graphic cursor, the second overlay screen memory 1 of the graphic cursor is
4, and there is no need to rewrite the graphic image in the graphic screen memory 12 as the graphic cursor moves, as in the conventional case.

In the state in which the superimposed images are displayed as described above, when displaying the pop-up menu image PUM in an overlapping manner, the display processor 11 generates the pop-up menu image upon request, and also displays the overlay pits of the image as 11111. and stored in the second overlay screen memory 14.

As a result, the display screen displays (1) a graphic cursor and a pop-up menu image, and (11) a graphic cursor, a character that does not overlap with the pop-up menu image, a character cursor, and (each cursor, a pop-up menu image, and a character image). Non-overlapping graphic images are drawn on the display screen.In other words, the pop-up menu image can be displayed without saving the first overlay image as in the past, and when the menu image display is to be deleted, the first overlay image can be displayed. It is only necessary to delete the pop-up menu image from the second overlay screen memory 14, and there is no need to save or restore the first overlay image as in the conventional method, which simplifies the process.

Although the above example is a case in which two overlay screen memories are provided, it is also possible to provide three or more overlay screen memories. Furthermore, although the above description has been made assuming that the graphic images and overlay images are all generated by the display processor, the graphic images may be generated by a separate graphic engine if a separate graphic engine is provided for generating the graphic images.

<Effects of the Invention> According to the present invention, since a graphic image and two or more overlay images are stored and drawn in their respective screen memories, the graphic cursor does not move when scrolling character images. It has been possible to provide a display control method which can perform an operation without flickering on the screen even when a graphic cursor is moved, and which does not require saving an overlay image when displaying a pop-up menu image.

[Brief explanation of the drawing]

Figure 1 is a block diagram of an embodiment of the method of the present invention, Figure 2 (,)
is an explanatory diagram of the overlay image control flag, Fig. 2 is an explanatory diagram of the storage area according to the picture element, Fig. 3 is an explanatory diagram of which picture element of the image is output, and Fig. 4 is an example of image storage. FIG. 5 is an explanatory diagram of conventional drawbacks. 11. Display processor, 12. Graphic screen memory, 13. 14. 1st. 2nd overlay screen memory, 15.
...Overlay image control flag, 17..Overlay control unit, 18..Cathode ray tube (CRT) Patent applicant: Fanuc Corporation Representative Patent attorney: Chiki Saito (Fig. 2) Fig. 2 ('b) 3 Figure 1 - Part 1 27. '';-7,71,'S,!0, Rent/Schiff;・Edited・Special opening UG3-273894 (6) Figure 5

Claims (2)

[Claims] (1) Store a graphic image and two or more overlay images in their respective screen memories, and for areas where images read out synchronously from each screen memory overlap, output an image with a higher priority and convert it into a graphic image. A display control method characterized by drawing an image formed by overlapping each overlay image on a display screen. (2) A patent characterized in that the priority order is specified by data that controls display on/off of the overlay image on a screen-by-screen basis and data that controls display on/off of the overlay image on a pixel-by-pixel basis. A display control method according to claim 1.