JPH0540459A - Display controller - Google Patents

Abstract

PURPOSE:To vary a window displayed on the screen of a display in various kinds of shape and to overlap another window on a certain window. CONSTITUTION:Coordinate data representing the start and completion of display of the window to be displayed are stored in memory 23, and a display switching control part 22 compares the coordinate data with coordinate to be displayed, and decides whether or not the window should be displayed. A display signal switching circuit 1 switches a display picture and the window based on the decision result of the display switching control part 22, and displays them on the display 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display control device, for example, a display control device for displaying a moving picture window on a multi-window.

[0002]

2. Description of the Related Art In a computer system, a multi-window for inserting another moving image or the like into an image displayed on a screen of a display is used. In this multi-window, for example, a moving image or the like is displayed in a still image to improve the usability of the display.

FIG. 2 shows a conventional display control device for performing such multi-window. The apparatus shown in the figure has a display signal switching circuit 1, a CRT controller 2, a register 3,
4, 5, 6, processor 7, and display switching control unit 8
And a display 9. Display signal switching circuit 1
Inputs the still image display signal 11 and the moving image display signal 12, switches the display signals 11 and 12 by the display signal switching control signal 13 which is the output signal of the display switching control unit 8, and displays them on the display 9. It is a signal switching circuit for transmitting the signal 14. Further, 15 is a still image display signal 1
A screen image of a still image that shows the contents of 1 in two dimensions, 1
6 shows a screen image of a moving image of the moving image display signal 12. The CRT controller 2 is composed of a known CRT controller and has a function of outputting a dot address signal of an image displayed on the display 9 and a raster address signal. Registers 3, 4, 5, and 6 are coordinates (x1, y1) indicating a rectangular area for displaying a moving image set by the processor 7,
It has the function of holding the value of (x2, y2), and registers 3
Is x1, the register 4 holds the value y1, the register 5 holds the value x2, and the register 6 holds the value y2. Display switching control unit 8
Is a circuit for controlling switching between a still image and a moving image. The dot address value output from the CRT controller 2 is greater than or equal to x1 output by the register 3 and less than x2 output by the register 5, and the raster address value is Is greater than or equal to y1 which is the value of the register 4 and less than y2 which is the value of the register 6, a function of turning the display signal switching control signal 13 on, and otherwise turning the display signal switching control signal 13 off. have.

Next, the operation will be described. First, the processor 7 sets the coordinates (x1
, Y1) and (x2, y2) in registers 3, 4,
Set to 5 and 6. The CRT controller 2 also outputs a dot address signal and a raster address signal. Regarding the dot address signal and the raster address signal, the contents of the display signals 11, 12, and 14 are displayed on the display 9
It is a signal indicating which position on the screen. As a result, the display switching controller 8 determines that the dot address value output from the CRT controller 2 is greater than or equal to x1 output by the register 3 and less than x2 output by the register 5, and the raster address value is the value in the register 4. It is determined whether or not the condition of being equal to or more than y1 and less than y2 which is the value of the register 6 is satisfied, and when satisfied, the display signal switching control signal 13 is turned on. Turn off 13. Display signal switching circuit 1
When the display signal switching control signal 13 is ON,
Select the video display and display the contents of the display signal 12 in the display signal 14
Is sent to the display 9. When the display signal switching control signal 13 is off, the still image display is selected and the content of the display signal 11 is sent to the display 9. As a result, (x1, y1
), (X2, y2), a moving image is displayed in a rectangular area indicated by (x2, y2), and a multi-window in which the moving image is displayed in a still image can be performed.

[0005]

However, in the conventional display control device, as described above, (x1, y1),
Since the display switching control unit 8 controls based on the coordinates indicated by (x2, y2), the moving image can be displayed only in the rectangular area. Therefore, another window cannot be overlapped on the moving image window.

Such an example is shown in FIG. That is, conventionally, since the moving image is always displayed in the rectangular area indicated by (x1, y1) and (x2, y2), the window B can be displayed in the overlapping portion C of the windows A and B. However, there is a problem in that operability is poor. The present invention has been made to solve the above conventional problems,
It is an object of the present invention to provide a display control device that can have various shapes in the image display area and has improved operability.

[0007]

A display control device of the present invention is a display control device for displaying a predetermined window on a screen of a display, and a memory for storing coordinates of display start and display end of the window. The display switching control unit that compares the coordinates in the memory with the coordinates to be displayed and determines whether to display the window based on the comparison result, and the display switching control unit based on the determination result of the display switching control unit. A display signal switching circuit for switching is provided.

[0008]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a display control device of the present invention. The device shown in the figure has a display signal switching circuit 1
, CRT controller 2, display 9, processor 21, display switching control unit 22, and memory 23.
And a multiplexer 24 and registers 25 and 26.

Since the display signal switching circuit 1, the CRT controller 2 and the display 9 have the same construction as the conventional one, the corresponding parts are designated by the same reference numerals and the description thereof is omitted. The display switching control unit 22 is a circuit that controls switching between a still image and a moving image, as in the conventional case, and includes the CRT controller 2
And the output signals of the registers 25 and 26 are input, and the display signal switching control signal 27 is sent to the display signal switching circuit 1. The memory 23 is composed of a random access memory or the like, has a data width of (bit width of dot address) × 2, and has an address space for raster addresses. The data bus of the memory 23 is the data bus 2 of the processor 21.
8 and the registers 25 and 26. The multiplexer 24 is the CRT controller 2
And the raster address signal output from the processor 21
Is a switching circuit for switching a signal of the address bus from the processor 21 at a predetermined timing by the processor 21 and sending a memory address signal to the memory 23. Also, 29,
Reference numeral 30 denotes a screen image that two-dimensionally represents the contents of the still image display signal 31 and the moving image display signal 32 input to the display signal switching circuit 1, and the frame within the still image 29 is a moving image display designated area 33. Is shown.

Next, the operation will be described. First, the processor 21 writes the display start dot address x1 and the display end dot address x2 in the memory 23 for each raster. At this time, x1 = x2 = 0 is written in the memory 23 for the raster that does not display the moving image. FIG. 4 shows a setting example of the memory 23 for displaying a moving image in such a moving image display designation area 32. In this case, the memory addresses 0 to y1 -1 are rasters that do not display a moving image, y1 to y2 -1 are in the range of dot addresses x1 'to x2', and y2 to y3-.
Up to 1, a moving image is displayed in the range of dot addresses x1 "to x2 ', and from y3 to yMAX, a moving image is not displayed in a raster state.

Next, the CRT controller 2 outputs the dot address and the raster address. This dot address is directly input to the display switching controller 22, and the raster address is given to the memory 23 as a memory address via the multiplexer 24. The memory 23 outputs the dot addresses of the display start and the display end according to the memory address to the data bus, and registers 25 and 26 respectively.
To store. Then, the registers 25 and 26 output the display start and end dot addresses x1 and x2 to the display switching control unit 22. The display switching control unit 22 is CR
Dot address from T controller 2 and register 2
The dot addresses x1 and x2 from 5 and 26 are compared, and when the dot address ≧ x1 and the dot address <x2, the display signal switching control signal 27 is turned on, and when not, it is turned off. Accordingly, the display signal switching circuit 1 outputs the display signal 32 of the moving image 30 as the display signal 34 to the display 9 when the display signal switching control signal 27 is on, and outputs the display signal 32 of the moving image 30 when the display signal switching control signal 27 is off. , The display signal 31 of the still image 29 to the display signal 3 to the display 9
Output as 4. Therefore, the moving image 30 can be combined and displayed at an arbitrary position for each raster, and as a result, the moving image display area can be formed in various shapes in addition to the rectangle.

In the above embodiment, the dot address is designated in correspondence with the raster address, and the moving image is displayed based on the dot address. However, on the contrary,
Specify the raster address corresponding to the dot address,
You may comprise so that a moving image may be displayed based on this raster address. Further, in the above-described embodiment, the moving image is displayed in the still image. However, the present invention is not limited to the moving image only, and it is possible to display another still image in the still image. Play.

[0013]

As described above in detail, according to the display control device of the present invention, the coordinates of the display start and the display end of the window opened on the screen of the display are designated, and the designated coordinates are designated. , Compare the coordinates to be displayed,
Since it is determined whether or not the window is displayed and the window is displayed based on the result of the determination, the window can have various shapes in addition to the rectangle. As a result, for example, another window can be overlapped with the moving image window, and the operability can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a display control device of the present invention.

FIG. 2 is a block diagram of a conventional display control device.

FIG. 3 is an explanatory diagram of an overlapping state between a moving image window and another window.

FIG. 4 is a memory state diagram of the device of the present invention.

[Explanation of symbols]

 1 Display Signal Switching Circuit 9 Display 22 Display Switching Control Unit 23 Memory 29 Still Image 30 Video

Claims (1)

[Claims] 1. A display control device for displaying a predetermined window on a screen of a display, comprising: a memory for storing coordinates of start and end of display of the window; coordinates in the memory; and coordinates to be displayed. A display switching control unit that makes a comparison and determines whether to display the window based on the comparison result, and a display signal switching circuit that switches the display based on the determination result of the display switching control unit are provided. Characteristic display control device.