JPS63301092A - Window controller - 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 transfers a plurality of windows consisting of image data stored in a work memory to a video memory by a display controller controlled by a CPU. The present invention relates to a window control device that outputs data from a memory and displays it as an image on the screen of a display device.

<Prior Art> Generally, a CRT display device such as an interactive graphic processing system such as CAD using a computer allocates multiple processes executed by the computer to individual windows in the work memory, and displays the image information of each window. , CPU-controlled C
The RT controller transfers it to any address in the video memory in any size, outputs it from this video memory, and outputs it to the C
It can be displayed in any desired form on the RT screen.

Conventionally, when changing or moving the size of multiple windows displayed as images on the screen of such a CRT display device, the operator looks at the screen and inputs the change size of the window and the coordinates of the destination using the keyboard or light bender. This is done manually by pressing several function keys.

<Problems to be Solved by the Invention> However, when changing the size and position of a plurality of windows on the screen of the above-mentioned conventional CRT display device in order to view them in an optimal state, the windows often overlap with each other. In such a case, in the area in the video memory corresponding to the overlapping part, the previously stored image data of the stationary window is rewritten with the image data of the moving window, so the image displayed on the CRT is The image of the stationary window at the bottom is erased by the image of the moving window at the top, and disappears as shown in FIG. Therefore, in order to see the lower image, you have to operate the keyboard again to move the upper window or switch the vertical relationship between the two windows, which may be a disadvantage of making the operation time-consuming and complicated. be. Furthermore, since the upper and lower images cannot be viewed at the same time in the overlapping area, there is nothing that can be done if it is necessary to perform some operation in such a state.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a window control that can eliminate the disadvantages and inconveniences of conventional screen operations by allowing the image of the lower window to be viewed through the upper window even in areas where multiple windows on a CRT screen overlap. The purpose is to provide equipment.

Means for Solving the Problems In order to achieve the above object, the window control device of the present invention is provided in a display controller controlled by a CPU and controls a plurality of windows consisting of image data stored in a work memory. a second register and a second register that store coordinate information and window sizes on the display screen of the display screen in the order of transfer; If it is determined that they overlap on the screen, the read image data corresponding to each pixel in the overlapping part of both windows is logically ORed or exclusive ORed and stored in the video memory. The present invention is characterized in that it includes a superimposing means for outputting image data from the video memory so that the superimposed images of the first and second windows can be viewed on the screen of the display device.

As illustrated in FIG. 1, the work memory contains windows A, 1, and
Image data A and B are stored in address order corresponding to each pixel from the upper left corner of window B, respectively, and the first and second registers 6.7 of the CrtT controller store the image data of the corners of windows A and H on the CRT screen. Coordinate information (X
a, Ya), (Xb.

Yb) and the size of windows A, H (L xa,
Lya).

(L xb, Lyb) are respectively stored.

When the window superimposition signal is input from the CPU, the superposition means inputs the contents of the first and second registers 6.7 [(Xa, Ya), (Lxa, Lya)] [(Xb,
Yb).

(L xb, Lyb)]
, B overlap on the CRT screen, and if it is determined that they overlap, then for the image data corresponding to each pixel of the overlapped part of both the read windows (see dashed line hatching in FIG. 1), A logical OR (see FIG. 2) or an exclusive OR (see FIG. 5) is taken and output to the corresponding address in the video memory. The output image data is output from the video memory to the CRT, and displayed on the screen so that the images of both windows superimposed are visible as illustrated in FIG. 4 or FIG. 6.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is a schematic block diagram showing an embodiment of a window control device for a CRT display device according to the present invention, in which 1 is a CPU that controls the entire CRT display device, and 2 is a CPU that is controlled by this CPU and stored in memory. A CRT controller 3 controls image data transfer, sending and receiving, horizontal and vertical synchronization signals, etc.; 3 a plurality of windows corresponding to the image data of each process executed by the CPU 1; data being processed; programs for transfer; A work memory 4 stores the image information of each window transferred from the work memory 3 by the CRT controller 2 at an address corresponding to the display position on the screen; 5 a video memory 5 stores the image information of each window transferred from the work memory 3 by the CRT controller 2; This is a CRT that displays image information output from the memory 4 as an image on the screen.

The work memory 3 includes a window A on the CRT screen shown in the video memory 4 of FIG.

Image data A and B corresponding to each pixel are stored in address order from the upper left corner (Xa, Ya), (Xb, Yb) of B in the scanning direction. On the other hand, the CRT controller 2 has first and second registers 6.7 that respectively store data related to the transfer of image data from the windows A and B in the order of transfer. Corner coordinate information (X
a, Ya) and the size of window A (L xa,
The second register 7 stores (Xb, Yb) and (L xb, Lyb) of window B.
is stored. Then, the CRT controller 2 first inputs the image data of the window A so that the starting point thereof is the corner coordinates (Xa, Ya) of the second register 6 of the video memory 4.
Then, the image data of window B is similarly transferred corresponding to the corner coordinates (X b, Y b) of the second register 7. The CRT controller 2 also serves as a superposition means, and when a window superposition signal is input from a keyboard (not shown) via cput, the It is determined whether the windows overlap on the screen, and if it is determined that they overlap (see the dashed line hatching in Figure 1), the image data corresponding to each pixel in the overlapping part of both windows to be transferred is shown in Figure 2. A circuit as shown in FIG. 2(b) calculates the logical sum and outputs the signal shown at 2 in FIG. 2(a) to the video memory 4.

The operation of the window control device of the CRT display device having the above configuration will now be described with reference to FIGS. 3 and 4.

The work memory 3 stores image data A and B corresponding to the images of the two rectangular windows A and H shown in FIG. is the corner coordinate of window A (Xa,
Ya), size (L xa, L ya) and corner coordinates of window B (xb, yb).

It is assumed that the sizes (L xb, Lyb) are stored as shown in FIG. In step St, the CRT controller 2 sequentially reads image data corresponding to each pixel of both windows A and B from the work memory 3 based on the contents of both registers 6.7, and in step S2, reads the image data corresponding to each pixel of both windows A and B.
Whether or not superimposition processing is necessary is determined based on whether the window superimposition signal is manually generated from U1. When it is determined that the overlapping process is not necessary, in step S3, the image data of window A read first is output, and then the image data of window B read later is output, while when it is determined that the overlapping process is necessary. , In step S4, the overlapping portion of the window A read out earlier and the window B read out later is determined (see dashed line hatching in FIG. 1),
Both image data corresponding to each pixel in this part are logically summed and output. The output image data is written to the corresponding address of the video memory 4 in step S5, and if step S3 is passed, it is first written to the area of the video memory 4 corresponding to the part that matches the above-mentioned type. The image data of window A that was created is rewritten with the image data of window B. On the other hand, if step S4 is passed, window A will be rewritten in the above area.

Image data in which B is superimposed is written. In this way, the image data written to the video memory 4 is transferred to the CRT.
CR'l'' by the display command signal from controller 2
5, and if it goes through step S3, it is shown in Figure 7(b).
If step S4 is performed in the upward position as shown in FIG. 4(b), both images are displayed in a superimposed state so as to be visible, respectively.

FIG. 5 is a diagram showing another embodiment in which exclusive OR is performed on image data of the overlapping portions of windows A and B. In this embodiment, the exclusive OR of each pixel output X of window A and each pixel output y of window B is performed using a circuit as shown in FIG. The output is output to the memory, and the relationship between human power and output is as shown in FIG. 5(a). FIG. 6 shows an example of image display according to this embodiment, in which characters and figures are displayed in white on a black background in overlapping areas, and in black in areas where characters and figures overlap.

According to the above embodiment, the operator can simply press the window superimposition command key on the keyboard once, as shown in FIG. 4(b).
Even in areas where windows overlap, as shown in the screen in Figure 6, the image of the lower window can be viewed through the upper window, making it easy to view the image of the lower window without having to move or replace the upper window as in the conventional method. Note that the number of registers in the display controller of the present invention is not limited to two as in the embodiment, but may be provided as many as the number of windows. It can also be displayed.

<Effects of the Invention> As is clear from the above description, the window control device of the present invention has first and second windows that store coordinate information and sizes on the display screen of a plurality of windows consisting of image data stored in the work memory. A second register is provided in the display controller, and a superposition means that receives a window superposition signal from the CPU determines whether or not both windows overlap on the screen based on the contents of both registers, and it is determined that they overlap. , performs a logical OR or exclusive OR on the read image data corresponding to each pixel in the overlapping portion of both windows, outputs the result to the video memory, and outputs the image data in the video memory to the display. Therefore, even if the first and second windows overlap on the display screen, you can see the image of the lower window through the image of the upper window, and you can view the image of the upper window without the hassle of conventional operations. You can easily operate the screen without moving or replacing the images, which greatly contributes to improved operability.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing an embodiment of a window control device for a CRT display device according to the present invention, FIG. 2 is an explanatory diagram of the OR circuit of the above embodiment, and FIG. 3 shows the operation of the above embodiment. Flow chart, FIG. 4 is a diagram showing a screen display example of the above embodiment, FIG. 5 is an explanatory diagram of the exclusive OR circuit of the embodiment of the present invention, and FIG. 6 is a screen display of the above embodiment. FIG. 7 is a diagram showing an example of a conventional image display. 1...CPU, 2...CRT controller, 3.
...Work memory, 4...Video memory, 5...(
, RT16...second register, 7...second renostar,
A, B...window. Figure 7(a)

Claims (1)

[Claims] (1) A display controller controlled by the CPU transfers multiple windows consisting of image data stored in work memory to video memory, outputs them from this video memory, and displays them as images on the screen of a display device. A window control device, which is provided in the display controller and includes a first register and a second register that store coordinate information of each window on the display screen and the size of the window, and receives a window superimposition signal from the CPU. Then, based on the contents of the first and second registers, it is determined whether or not the two windows overlap on the screen, and if it is determined that they overlap, each pixel corresponding to the overlapped portion of the read windows is determined. a superimposing means for performing a logical OR or an exclusive OR on the image data and outputting the result to the video memory, so that the images of the first and second windows superimposed can be viewed on the screen of the display device. A window control device characterized by: