JPS62272376A - Method and device for multiwindow display - Google Patents

Abstract

PURPOSE:To prevent another picture from being broken for scrolling by accessing only the area in a frame memory where a picture is stored. CONSTITUTION:Picture information A is stored in the background area BG of a frame memory 7, and a part (b) of picture information B is stored in a foreground area FG, and picture information A is displayed as a back window on a CRT 8, and foreground picture information (b) cut to a window shape is displayed there. When the upper part is transferred to the frame memory 7, this picture information b00 is stored up to the upper end of the area FG and a remainder part is written in the address of the area BG, but only the area FG is accessed by the output of a display control part 6 and picture data is written upward from the lower end of the area FG. Thus, picture information b0 is scrolled upward without breaking picture information A on the display of the CRT 8.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an image display method and device having a multi-window display function in an image display device. The present invention relates to a method and apparatus for scrolling images displayed on a computer.

[Prior art]

When image processing is performed using a word processor, a microcomputer, etc., a so-called multi-window display is performed in which a part of the display screen on which a certain image is displayed is cut out into a window shape and another image is displayed.

FIG. 4 is a schematic diagram showing a conventional multi-window display method. First, store multiple files in the window memory.
In the + example, two window areas are set, image information A and B are stored in each, and image information B is given a higher priority in the frame memory, as shown in Figure 4).
Specifically, after image information A is transferred and stored in the frame memory, image information B is transferred to the frame memory and stored in a superimposed manner on top of the image information B. If the stored contents of the frame memory are displayed as they are on a CRT display, as shown in FIG. is displayed.

FIG. 5 is a schematic diagram showing another method. First, similar to the example in Fig. 4, a plurality of window areas are set in the window memory, and in the example in Fig. 5 i8), two window areas are set, and image information A and B are stored in each. ), as in
The frames are transferred and stored in different storage areas of the frame memory. Then, by setting appropriate display start addresses for each, image information A and B stored in the frame memory are first displayed on the CRT display with image information A as the back window, as shown in FIG. 5(G). Then, image information B is displayed on the forewindow, a portion of which is cut out in the shape of a window.

(Problems to be Solved by the Invention) By the way, when displaying an image, if the entire image information cannot be displayed on one screen at the same time, a process of sequentially moving and displaying the image, So-called scrolling is necessary.There are two methods for performing this scrolling.

The first is to rewrite all of the image information stored in the display image memory (equivalent to the above-mentioned frame memory) as data to be displayed on the display device into image information after scrolling, and then display it. This is the way to do it.

The second method is to add only the changed information, that is, the image information that should be newly added and displayed after scrolling, to the image memory, and change the display start address accordingly, so that the newly added information can be added. This is a method of displaying information including the information on the display device.

In the first method described above, every time scrolling is performed, all the image data to be scrolled must be rewritten on the display image memory, and if the amount of information is large, the processing time becomes long and scrolling becomes difficult. The disadvantage is that the speed is slow.

On the other hand, the second method, when applicable to multi-window display, has the problem that image information other than the image information that is the object of scrolling may be destroyed.

This point will be specifically explained below.

FIG. 6 shows a case where a multi-window display similar to that shown in FIG. Consider the case where the image information in the forewindow is scrolled upward from a state in which the image is displayed.

In this case, the image information b1 of the part that should be newly displayed after scrolling shown in FIG.
is newly transferred to the frame memory and stored connected to the top of the image information screen. Therefore, at this point, the image information A in the part where image information b1 is stored in the frame memory is destroyed, so if this is displayed on the CRT display, the image information will scroll upwards as shown in Figure 6 (C1). The image information b1 for the scroll portion is displayed, but the image information b1 for the scroll portion is displayed doubly above it.

In addition, when performing a multi-window display similar to that shown in FIG. 5, as shown in Section 711(a), part of the image information B is transferred and stored in the frame memory as forewindow image information. Consider the case where foreground image information fgb is scrolled to the right from a state where it is displayed on a CRT display. In this case, the image information b2 of the portion to be newly displayed after scrolling, which is indicated by hatching in FIG. 7 1dl, is newly transferred to the frame memory and stored connected to the right side of the image information screen. If the display start address when giving data from the frame memory to the CRT display is shifted to the right, the image information will appear in the forewindow part of the CRT display screen, as shown in Figure 7 [C]. (image information 82 is added to the right side) and displayed. Such processing is similar when scrolling to the left.

However, regarding scrolling upward, Fig. 7 1dl
At the time when the image information b1 for the scroll amount shown in is transferred to the frame memory, as shown in the same figure), it is connected to the top of the image information and stored, so the size of the image information b2 in the vertical direction (Y direction) is When the value exceeds a certain level, image information A
The lower part of the is destroyed. Therefore, in such a state, C1
? ? On the display, as shown in FIG. 7 1dl, the image information is scrolled upwards and the image information b1 for the upward scroll is displayed, but the lower part of the image information A is destroyed and the scrolled portion of the image information b2 is displayed. appears at the bottom of image information A.

The present invention has been made in view of the above-mentioned problems, and it is possible to scroll images displayed in a window independently and at a relatively high speed by multi-window display without causing the above-mentioned problems. The purpose of the present invention is to provide a method and device for multi-window display.

[Means for solving problems]

In the present invention, the frame memory, which is the image memory for display, is divided, and the frame memory is accessed using information specifying each area and storage location information commonly assigned to each area, so that the frame memory can be accessed on the display screen. Even if an image in a certain window is scrolled, only the area in the frame memory where the image is stored is accessed.

The present invention provides a method in which each image information of a plurality of window areas set in a window memory is transferred and stored in a frame memory, and the contents stored in the frame memory are displayed in a multi-window on a display screen. Each area is divided into a plurality of areas with common data storage location information, each area is given area information that specifies each area, and the area information given to the frame memory is used to store the image to be scrolled. The area information of the frame memory is fixed to the area information of the frame memory, and the part on the window memory corresponding to the part to be added and displayed on the display screen after scrolling of the image to be scrolled is written to the frame memory according to the storage position information, and it is made to correspond to the amount of scrolling. The present invention is characterized in that scrolling is performed by reading the contents of the frame memory and displaying them on the display screen according to storage position information whose display start position has been changed.

[Effect]

In the present invention, even if an image in a window on the display screen is scrolled, only the area in the frame memory where that image is stored is accessed, so other images are not destroyed during scrolling. There's nothing wrong with that.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof.

FIG. 1 is a block diagram showing the configuration of an apparatus for implementing the multi-window display method according to the present invention.

In the figure, reference numeral 1 denotes a main control section, which interprets instructions, command one-character codes, etc. input from the keyboard 9 and performs corresponding processing, or gives instructions and commands to each section, and transfers data.

The scanner 3 reads the original image, and the image data obtained thereby is written and stored in the window memory 5 by the window memory control section 4. The window memory control section 4 also reads the image data stored in the window memory 5, performs image processing such as enlargement/reduction, and outputs the image data to the display control section 6.

Although the details will be described later, the display control section 6 writes the image information given from the window memory control section 4 and the data given from the main control section 1 to the frame memory 7, and also stores the image information in the frame memory 7. data to CRT
Processing such as displaying on the display 8 is performed.

In addition, 9 in the figure is an encoding/decoding circuit, which converts and compresses image information into encoded data in order to record it on the optical disk 11, and also decodes the encoded data compressed and stored on the optical disk 11 to generate image data. Convert to Reference numeral 10 denotes an optical disk control section, which controls the writing of code data onto the optical disk 11 and the reading of code data from the optical disk 11.

As shown in FIG. 3 (bl), the frame memory 7 has its storage area divided into two parts, one of which is used as a background area BG, and each area is accessed with the most significant bit 0" at the top of the area. Addresses are assigned, and each address is assigned so that the other is the foreground area FG, and the address is accessed at the topmost pinbi l'' above the area, and the storage capacity of the double-head areas BG and FG,
7. The number of addresses in both directions is the same, and the upper address of the storage location is the same. Therefore, when accessing the frame memory 7, it is possible to access both the foreground area FG and the background area BG with the same lower focus by changing only the most significant bit.

FIG. 2 is a block diagram showing the configuration of the display control section 6 in more detail.

The display control section 6 includes a display address generation circuit 21, a multiplexer 22, gates 23, 24, and the like.

The display address generation circuit 21 includes an FG/BG management register 210 for managing each of the foreground area FG and background area BG.
The BG management register is the starting address (
The FG management register stores the start address (lower focus) of the image information stored in the foreground area FG of the frame memory 7, and the X and Y direction display addresses. number, and furthermore, an address indicating which address on the image information stored in the bank ground area BG is to be displayed is stored.

Further, from this display address generation circuit 21, a foreground display signal F-DIS which becomes high level when displaying the foreground FG on the CIIT display 8 is generated.
P is output to the first gate 23.

The multiplexer 22 is supplied with the address output from both registers of the display address generation circuit 21 mentioned above and the drawing address, and both are supplied with the display signal DISP (the content of the frame memo IJ7 is
frame memory 7 depending on the high level/low level of
It is switched and output as frame memory address FB-AD.

In addition to the foreground display signal F-DrSP, the first gate 23 receives a display signal DIS from the main control section 1.
P and foreground read/write signal F-11W
(becomes high level when writing/reading data to/from the foreground area FG) is given.

Therefore, the output of the first gate 23 becomes high level when the stored contents of the foreground area FG are displayed on the CRT display 8.

The output of the first gate described above is input directly and inverted to the second gate 24, and its output becomes high level when the foreground area FG of the frame memory 7 is accessed. The output of this second gate is output to the frame memory 7 as the most significant MS-bit of the frame memory 7, that is, area information specifying the blue areas FG and BG.

Next, the method of the present invention implemented in the apparatus of the present invention having the above-mentioned configuration will be described below with reference to the schematic diagram of FIG.

As shown in FIG. 3 (al), image information A for the bank window and image information B for the forewindow are written in two window areas set in the window memory 5, and image information A is used for the frame. A part of the image information @B is transferred to the background area BG of the memory 7 and a part of the image information @B is transferred to the foreground area FG of the frame memory 7 and stored therein.

Then, as shown in FIG. 3 (C1), the display control unit 6 displays the image information A on the CRT display 8 as a back window, and the image information TUB is displayed on the fore window cut out in the form of a window. ing.

At this time, accesses such as storing image information in the blue areas BG and FG and displaying it on the CRT display 8 are performed using the lower bits and the lower bits managed by the FG management register and the BG management register of the FG/BG management register 210, respectively. The most significant bit Ms-bi output from the gate 24 of
t respectively.

In such a state, for example, when scrolling upward the image information displayed as the forewindow on the CRT display 8, the upper part bO of the image information B shown by hunting in FIG. The image information is transferred to the memory 7 and written as shown in FIG.
/ Subtract the setting value of the FD management register of the BG management register 210 by the number of Y-direction addresses of the image information bO and execute CR.
By displaying it on the T display 8, the screen shown in FIG.
The image information is scrolled upwards as shown in t.

Furthermore, for example, when scrolling to the upper part indicated by boo in FIG.
0 is the foreground area F, as shown in FIG. 3(d).
The upper end of G is stored, and the remaining part is written to the address of the bank ground area BG. Since only the foreground area FG is accessed with the - bit, image data given an address in the background area BG above the upper end of the foreground area FG is written upward from the lower end of the foreground area PG.

Therefore, the display on the CRT display 8 is as shown in FIG.
), the image information A of the back window is not destroyed and is scrolled upward until the image information bo7!l<bo, boo.

〔effect〕

As described above, according to the present invention, the display contents of one window can be scrolled at high speed on a multi-window display screen, and destruction of the display contents of one window can also be avoided at this time.

In addition, although the above-mentioned embodiment describes the case where the back window is fixed and the fore window is scrolled, the same effect can be obtained when the fore window is fixed and the bank window is scrolled.

Furthermore, in the above embodiment, the case where the frame memory is divided into two and two windows are displayed was explained, but when displaying a larger number of windows in multiple windows, the amount of space in the frame memory is divided according to the number of windows. The present invention can be easily applied by providing a management register and configuring the storage area of the frame memory to be divided according to the upper several bits of the address used to access the frame memory.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the multi-window display device of the present invention, FIG. 2 is a block diagram showing the configuration of its display control section, FIG. 3 is an explanatory diagram of the operation of the device of the present invention, and Section 4.5
．． 6 and 7 are explanatory diagrams of the prior art. 1... Main control section 4... Window memory control section 5... Window memory 6... Display control section
7... Frame memory B... CRT display agent Patent attorney Noboru Kono (a) (d) kJ, 3 Figures (a) (b)
(C) also 4I21 (d) (b)
(C) (a) (b) 裟 (b) (C) Atsushi 6 Figure (C) (rl) 7 Figure

Claims (1)

[Scope of Claims] 1. A method for transferring and storing each image information of a plurality of window areas set in a window memory in a frame memory, and displaying the stored contents of the frame memory in a multi-window on a display screen, comprising: The frame memory is divided into a plurality of areas with common data storage location information for each area, area information that specifies each area is attached to each area, and the area information given to the frame memory is used to determine the area to be scrolled. Fix the area information of the frame memory where the image is stored, write the part on the window memory corresponding to the part that will be added to the display screen after scrolling the image to be scrolled to the frame memory according to the storage position information, and scroll. A multi-window display method characterized in that scrolling is performed by reading out the contents of a frame memory and displaying it on a display screen according to storage position information in which the display start position is changed in accordance with the amount of display. 2. In a device that transfers and stores each image information of a plurality of window areas set in a window memory to a frame memory, and displays the stored contents of the frame memory in a multi-window on a display screen, the frame memory Display of image data stored in each area of the frame memory should be accessed using an address consisting of area information specifying each area divided into a plurality of areas and storage location information of data common to each area. a register for managing information represented by storage location information on the frame memory for display on a screen; and a register for selectively outputting corresponding area information when each area of the frame memory is accessed. What is claimed is: 1. A multi-window display device comprising: area information output means for providing area information to the frame memory; and means for writing/reading image data to/from the frame memory according to information in the register.