JP2000311076A - Data display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data display device which does not require the saving/ rewriting of picture element data on a part hidden by the overlap of windows and which can execute a high speed processing. SOLUTION: Video memories 1a-1c holding picture element data of windows are hierarchically stored in a video memory stack 11. The video memories are managed by a video memory management means 12. A host bus interface means 13 newly secures the video memory at the time of plotting the new window. Display position information on the screen of a monitor 4 is preserved with picture element data on the video memory. The pertinent video memory is positioned on the highest stage of the video memory stack and picture element data on the respective video memories are synthesized by a video synthesis means 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data display device for displaying pixel data at a high speed when a plurality of windows are simultaneously displayed.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram showing the configuration of a conventional data display device disclosed in, for example, Japanese Patent Application Laid-Open No. 8-28678. In the figure, 1 is a video memory, 2 is a host bus, 3 is a display controller, 4 is a monitor, 5 is a CPU, 6 is a system memory, 7 is an external memory, 8 is a keyboard, 9 is a mouse, and 10 is an I / O controller. It is.

Next, the operation will be described. The conventional data display device displays pixel data on the monitor 4 by:
The display controller 3 writes the pixel data recorded in the external memory 7 to the video memory 1 via the system memory 6, and the pixel data in the video memory 1 is displayed on the monitor 4. In this case, since there is only one video memory 1, when displaying a plurality of windows on the monitor 4 at the same time, the pixel data of the displayed portion of all the windows is stored in the one video memory 1.
And then drawing. For this reason, when displaying an image with overlapping windows, a method of saving the overlapping hidden parts to another memory is adopted, and when the window is erased or the position is changed, the pixel data of the previously hidden part is restored again. The method of writing to the video memory 1 has been adopted.

As a document describing a technique related to such a conventional data display device, for example, only one video memory (frame memory) is disclosed in Japanese Patent Application Laid-Open No. H8-286878. Japanese Unexamined Patent Publication No. Hei 10-31573 and a plurality of video memories are prepared, but Japanese Unexamined Patent Publication No. Hei 7-37078 discloses that these are used only for displaying one window.

[0005]

Since the conventional data display device is configured as described above, the entire pixel data displayed on the screen of the monitor 4 is stored in one video memory 1.
Since the pixel data is created and then sent to the monitor 4, when multiple windows are displayed at the same time, the overlapping and hidden parts of the windows must be saved to another memory once. When the hidden portion is displayed again, the pixel data of that portion is stored in the video memory 1 again.
In such a case, extra data transfer other than the pixel data to be drawn occurs, and the processing time is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. Independent video memories are individually prepared for each window, and a method of synthesizing these and drawing is adopted to obtain a window. It is an object of the present invention to provide a data display device capable of performing high-speed drawing processing by eliminating save / rewrite processing of pixel data in a portion hidden by overlap.

[0007]

A data display device according to the present invention stores a plurality of video memories hierarchically in a video memory stack, manages them in a stack format, and stores, in each video memory, pixels held by the video memories. The display position information of the data on the monitor screen is added, and by updating the display position information, the order of the video memories in the video memory stack is changed, and the pixel data of the video memory on the upper side of the video memory stack is displayed on the front of the monitor screen. Then, the pixel data of the lower video memory is positioned on the back of the monitor screen, and the pixel data held by each video memory is synthesized.

In the data display device according to the present invention, when a new window is displayed on the monitor screen, the pixel data is written into a newly secured video memory, and display position information on the monitor screen is added to the video memory. The video memory is located at the top of the stack.

In the data display device according to the present invention, when the display position of the window on the monitor screen is changed, only the display position information of the pixel data on the monitor screen added to the video memory is changed. is there.

In the data display device according to the present invention, when discarding the contents of the window, only the video memory holding the pixel data of the designated window is deleted from the video memory stack.

[0011] The data display device according to the present invention is provided with arithmetic means, performs processing by a predetermined arithmetic operation on pixel data stored in each video memory, and transfers the processed data to the video synthesizing means. It was done.

In the data display device according to the present invention, a window identifier indicating a video memory of a transfer destination is added to each pixel data, the window identifier is determined by window identifier determining means, and the window identifier is stored in the designated video memory. The pixel data is written.

The data display device according to the present invention is provided with a data selecting means for controlling and selecting the transfer processing of the pixel data in the video memory to the video synthesizing means.

A data display device according to the present invention includes a data compression means and a data decompression means, compresses pixel data input from a host bus interface means, stores the data in a video memory, and reads out the video data from the video memory. The pixel data is expanded and transferred to the video synthesizing means.

The data display device according to the present invention comprises a color palette and a pixel data conversion table. When writing pixel data to the video memory, the pixel data conversion table holds the color data format of the input pixel data. The conversion data is converted into the same color data format as the pixel data on the corresponding video memory.

The data display device according to the present invention includes data enlarging / reducing means for enlarging / reducing pixel data read from a video memory in accordance with a specified ratio, and transferring the pixel data to the video synthesizing means. Things.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of a data display device according to Embodiment 1 of the present invention. In the figure, reference numerals 1a, 1b, and 1c denote a plurality of video memories which are prepared for each of a plurality of windows to be displayed and hold pixel data for one window. Although this embodiment is equivalent to a conventional video memory, the first embodiment differs from the first embodiment in that a plurality of windows displayed on a monitor screen are prepared.

Reference numeral 2 denotes a host bus of the data display device;
Is a monitor on which a plurality of windows are displayed, 5 is a CPU for performing overall control of the data display device, and 6 is a CPU.
5 is a system memory accessed by 5; 7 is an external memory such as a hard disk device; 8 is a keyboard for inputting to the data display device; 9 is a mouse as a pointing device; These are I / O controllers, which are the same as those in the conventional data display device shown by the same reference numerals in FIG.

Reference numeral 11 denotes a video memory stack for hierarchically managing a plurality of video memories 1a to 1c in a stack format, and 12 updates position information indicating the display position of the pixel data on the screen of the monitor 4. This is a video memory management unit that manages each of the video memories 1a to 1c in the video memory stack 11, such as changing the order of the video memories 1a to 1c in the video memory stack 11. Reference numeral 13 provides an interface between the plurality of video memories 1a to 1c and the host bus 2. When a new window is displayed on the monitor 4, a new video memory 1a to 1c is provided.
A host bus for writing the pixel data to be displayed while securing 1c, adding information indicating the display position of the pixel data on the monitor screen, and positioning the video memories 1a to 1c at the top of the video memory stack 11. Interface means. 14 is a plurality of video memories 1a
1c are combined, and the pixel data of the video memories 1a to 1c, which are on the upper side of the video memory stack 11, are placed on the front of the screen of the monitor 4 and the video memory 1 on the lower side.
This is a video synthesizing means for synthesizing and displaying the pixel data of a to 1c on the back of the screen of the monitor 4.

FIG. 2 is a conceptual diagram for explaining the display of a plurality of windows in the data display device according to the first embodiment. FIG. 2A shows an example of a screen display on the monitor 4 and FIG. () Shows the state of each video memory 1a to 1c in the video memory stack 11 at that time. In the figure, 15a to 15c are a plurality of windows displayed on the screen of the monitor 4, and 16a to 16c are the pixels of the windows 15a to 15c stored in the respective video memories 1a to 1c in the video memory stack 11. Data.

Next, the operation will be described. In the data display device of the first embodiment, a new window 1
When opening 5a to 15c, the windows 15a to 15c
By assigning independent video memories 1a to 1c holding pixel data 16a to 16c for drawing c, and positioning the video memories 1a to 1c at the top of the video memory stack 11, the previously drawn window 15a A new window 15a to 15c is displayed on the front of the monitor 4 without discarding the pixel data 16a to 16c of the monitor 15c.

That is, when a new window (for example, window 15a) is opened, the host bus interface means 13 first sets the video memory 1a for storing the pixel data 16a to be displayed in the window 15a.
To secure. Next, the pixel data 16a is written into the video memory 1a, and position information on the screen of the monitor 4 where the pixel data 16a is displayed is added to the video memory 1a.
The host bus interface means 13 further positions (pushes) the video memory 1a at the top of the video memory stack 11. The video synthesizing unit 14 stores the pixel data 16a stored in the video memory 1a positioned at the top of the video memory stack 11.
However, the pixel data 16a to 16c of each of the windows 15a to 15c are synthesized and sent to the monitor 4 so as to be the foreground of the screen of the monitor 4. In this way, the newly opened window 15a is displayed in front of the windows 15b and 15c that have been displayed up to then.

Therefore, the windows 15b, 15 held by the video memories 1b, 1c stored below the video memory stack 11 which has been displayed so far are stored.
The pixel data 16a of the window 15a to be newly drawn can be drawn on the foreground of the screen of the monitor 4 without retracting or destroying the pixel data 16b and 16c of c.

When moving a window hidden by another window to the foreground, the video memory stack 1
By changing the position of the window's video memory in 1 to the top, the specified window is displayed in the foreground. That is, when moving the position of the designated window (for example, window 15b) on the screen of the monitor 4, the video memory management means 12 is added to the video memory 1b holding the pixel data 16b of the window 15b. The location information is updated to new location information of the destination. As a result, the order of the video memories 1a to 1c in the video memory stack 11 is changed, and the video memory 1b is positioned at the top of the video memory stack 11. The video synthesizing means 14 obtains the new position information when obtaining the pixel data 16b to be displayed, and places the window 15b stored in the video memory 1b at a new drawing position (foreground) on the monitor 4 screen. Is displayed.

As described above, since the video memories 1a to 1c independently hold the pixel data 16a to 16c and their display position information, even if the window 15b is not at the forefront of the screen of the monitor 4, Windows 15a, 15
The window 15b can be moved without destroying / evacuating the data of c and without re-transferring the pixel data 16b to the display position of the new window 15b.

Further, when discarding the contents of the designated window (for example, window 15a), the video memory management means 12
Pixel data 1 of the window 15a designated to be deleted
Only the video memory 1a holding 6a is deleted.
Next, the video memory 1b, which is positioned below and adjacent to the position where the deleted video memory 1a is held in the video memory stack 11, is replaced and held. As described above, only the video memory 1a that has been used is deleted from the video memory stack 11, so that it is not necessary to re-transfer the pixel data of the area hidden because the window 15a was displayed.

As described above, according to the first embodiment,
Since all of the video memories 1a to 1c holding the pixel data 16a to 16c to be drawn are hierarchically stored in the video memory stack 11 for each of the windows 15a to 15c, when the windows 15a to 15c are newly opened, they are hidden. When moving the windows 15a to 15c to the foreground, or when discarding the contents of the designated windows 15a to 15c, the image data 16a to 16c of the portion hidden by the overlapping of the windows 15a to 15c.
Pixel data 16a to 16c are stored in the video memories 1a to 1c in order to save
Is not necessary, and the video memories 1a to 1a
Since the pixel data 16a to 16c held by 1c is the pixel data 16a to 16c for one window, the effect of saving the capacity of the video memories 1a to 1c can be obtained.

Embodiment 2 In the first embodiment, the pixel data 16a to 16c output from each of the video memories 1a to 1c in the video memory stack 11 are used.
Has been described above, the pixel data 16a to 16c output from each of the video memories 1a to 1c may be processed and then transferred to the video combining unit 14.

FIG. 3 shows such a second embodiment of the present invention.
Video memory 1a in the video memory stack 11 when displaying a plurality of windows in the data display device according to
FIGS. 3A to 3C are conceptual diagrams showing the states of FIGS. 1A to 1C, and the corresponding parts are denoted by the same reference numerals as in FIG. 2 and description thereof is omitted. In the figure, 1
7a, 17b and 17c are provided corresponding to the respective video memories 1a to 1c.
1c and the pixel data 16 stored in each of the video memories 1a to 1c.
a to 16c are processed by a predetermined calculation,
It is an arithmetic unit for transferring the processed pixel data 16a to 16c to the video synthesizing unit 14.

Next, the operation will be described. When sending the pixel data 16a to 16c to be drawn held in each of the video memories 1a to 1c in the video memory stack 11 to the video synthesizing means 14, first, the pixel data 16a
To 16c are input to arithmetic means 17a to 17c connected to the respective video memories 1a to 1c. The operation means 17a to 17c are associated with the video memories 1a to 1c.
A predetermined calculation is performed on the pixel data 16a to 16c input from 1c, and the processing is performed. As this processing, for example, a higher-level window is displayed in a translucent state and a lower-level window is superimposed and displayed at the same time.
Each of the calculation means 17a to 17c converts the pixel data 16a to 16c thus processed into a video
Transfer to

As described above, according to the second embodiment,
Since the pixel data 16a to 16c to be transferred from each of the video memories 1a to 1c to the video synthesizing means 14 can be processed, for example, the upper window can be made translucent and the lower window can be displayed at the same time. Chroma key display and the like are facilitated, and an effect that various windows can be displayed is obtained.

Embodiment 3 FIG. Further, in each of the above-described embodiments, a case has been described in which each of the video memories 1a to 1c of the transfer destination in the video memory stack 11 of the pixel data 16a to 16c of the window displayed on the monitor screen is not specified. The pixel data 16a to 16c transferred from the host bus interface means 13.
May be written to the selected and designated video memories 1a to 1c.

FIG. 4 shows such a third embodiment of the present invention.
Video memory 1a in the video memory stack 11 when displaying a plurality of windows in the data display device according to
FIGS. 3A to 3C are conceptual diagrams showing the states of FIGS. 1A to 1C, and the corresponding parts are denoted by the same reference numerals as in FIG. 2 and description thereof is omitted. In the figure, 1
8a, 18b and 18c are provided corresponding to the respective video memories 1a to 1c, are disposed between the host bus interface means 13 and the respective video memories 1a to 1c and are directly connected to the respective video memories 1a to 1c. A window identifier indicating the video memory 1a to 1c of the transfer destination added to the pixel data 16a to 16c of each window is determined, and based on the determination result of the window identifier, each pixel data 16a to 16c is assigned to the specified video. It is a window identifier determining means to be written into the memories 1a to 1c.

Next, the operation will be described. The pixel data 16a to 16 of the window to be displayed on the monitor screen transferred through the host bus interface means 13.
A window identifier for identifying the transfer destination video memory 1a to 1c in which the pixel data 16a to 16c is stored is added to c. Each of the window identifier determination units 18a to 18c determines a window identifier added to the pixel data 16a to 16c from the host bus interface unit 13. As a result, if the window identifiers 18a to 18c match the window identifiers assigned to the video memories 1a to 1c to which they are connected, the respective pixel data 16a to 18c are determined.
16c to the window identifier determining means 18a to 18c.
Is written to the connected video memories 1a to 1c.
On the other hand, if they do not match, each window identifier determining means 18a to 18c
Is not written to the video memories 1a to 1c to which the window identifier determining means 18a to 18c are connected.

As described above, according to the third embodiment,
Video memory 1a-1 in video memory stack 11
c can be designated by the window identifier, and the pixel data 16a to 16c to be displayed can be transferred.
For example, it is possible to update the contents of a window that is hidden by other windows or only partially displayed on the monitor screen, and by specifying a plurality of window identifiers, the same pixel data 16a to 16a can be updated.
16c can be simultaneously written to the plurality of video memories 1a to 1c.

Embodiment 4 FIG. Further, in each of the above-described embodiments, a case has been described in which, when transferring the pixel data 16a to 16c to the video synthesizing means 14, it is not particularly determined whether or not the data is a display area data. It is determined whether or not 16c is the data of the display area,
Only when the data is within the display area, the pixel data 16a to 16c may be transferred to the video synthesizing unit 14.

FIG. 5 shows such a fourth embodiment of the present invention.
Video memory 1a in the video memory stack 11 when displaying a plurality of windows in the data display device according to
FIGS. 3A to 3C are conceptual diagrams showing the states of FIGS. 1A to 1C, and the corresponding parts are denoted by the same reference numerals as in FIG. 2 and description thereof is omitted. In the figure, 1
9a, 19b and 19c are provided corresponding to the respective video memories 1a to 1c.
When the pixel data 16a to 16c on each of the video memories 1a to 1c is transferred to the video synthesizing unit 14, the video memories 1a to 1c are arranged between the video memories 1a to 1c.
This is a data mask circuit as data selection means for controlling and selecting the transfer processing of the pixel data 16a to 16c held in 1c to the video synthesis means 14.

Next, the operation will be described. Each of the video memories 1a to 1c stored in the video memory stack 11
When transferring the above pixel data 16a to 16c to the video synthesizing means 14, first, the pixel data 16a to 16c read from the video memories 1a to 1c are converted into data masks connected to the respective video memories 1a to 1c. The signals are input to the circuits 19a to 19c. Data mask circuit 19a
When the pixel data 16a to 16c are input from the video memories 1a to 1c, the pixel data 16a
16c to the video synthesizing means 14 are controlled and sorted out. That is, it is determined whether or not the pixel data 16a to 16c is data of the display area. as a result,
If the data is within the display area, the pixel data 16 a to 16 c is transferred to the video combining means 14. On the other hand, if the data is outside the display area, the pixel data 16a input to the data mask circuits 19a to 19c
16c are discarded and not transferred to the video synthesizing means 14.

As described above, according to the fourth embodiment,
Pixel data 16a-1 transferred to the video synthesizing means 14
6c can be selected depending on whether it is data in the display area or not, so that it is possible to suppress the display of a specific window and to display only a specific area on the video memories 1a to 1c. The effect is obtained.

Embodiment 5 Further, in each of the above-described embodiments, the case where the pixel data 16a to 16c are stored as they are in the video memories 1a to 1c has been described, but the pixel data 16a to 16c are compressed and stored in the video memories 1a to 1c. The pixel data 16a to 16c stored and read from the video memories 1a to 1c may be expanded and transferred to the video synthesizing unit 14.

FIG. 6 shows such a fifth embodiment of the present invention.
Video memory 1a in the video memory stack 11 when displaying a plurality of windows in the data display device according to
FIGS. 3A to 3C are conceptual diagrams showing the states of FIGS. 1A to 1C, and the corresponding parts are denoted by the same reference numerals as in FIG. 2 and description thereof is omitted. In the figure, 2
Reference numerals 0a, 20b, and 20c are provided corresponding to the respective video memories 1a to 1c. Pixels 0a, 20b, and 20c are arranged between the host bus interface unit 13 and the video memories 1a to 1c. The data 16a to 16c are compressed, and the compressed data is stored in the corresponding video memory 1a to 1c in the video memory stack 11.
Is a data compression means to be stored in the. Also, 21a, 21
b, 21c are provided corresponding to each of the video memories 1a to 1c, are disposed between the video memories 1a to 1c and the video synthesizing means 14, and are provided from the video memories 1a to 1c in the video memory stack 11. Read out,
This is a data decompression unit that decompresses the compressed pixel data 16 a to 16 c and transfers it to the video synthesizing unit 14.

Next, the operation will be described. The pixel data 16a to 16c of each window is stored in the video memories
When storing the pixel data 16a to 16c transferred from the host bus interface means 13 into the data compression means 20a to 20c connected to each video memory 1a to 1c.
20c. The data compression means 20a to 20c compress the input pixel data 16a to 16c by a predetermined method, and store the compressed data in the video memories 1a to 1c. on the other hand,
When displaying each window, the pixel data 1 stored in each of the video memories 1a to 1c in a compressed state is displayed.
6a to 16c, and reads out the respective video memories 1a to 1c.
The data is input to the data decompression means 21a to 21c connected to 1c. The data decompressing means 21a to 21c decompress the input pixel data 16a to 16c by the method reverse to the above-mentioned compression and convert it to the original data format, and convert it to the video synthesizing means 1.
Transfer to 4.

As described above, according to the fifth embodiment,
Since the data amount of the pixel data 16a to 16c on the video memories 1a to 1c can be reduced by compressing the pixel data 16a to 16c, the video memory 1a holding the pixel data 16a to 16c for displaying one window. The effect is obtained that the memory capacity of ~ 1c can be reduced.

Embodiment 6 FIG. In each of the above embodiments, the pixel data 16a transferred to the video memories 1a to 1c via the host bus interface means 13 is used.
16 to 16c have the same color data format as the pixel data 16a to 16c displayed on the monitor screen via the video synthesizing means 14, but the pixel data 16a displayed on the monitor screen has been described. ~ 16
It is also possible to input the pixel data 16a to 16c from the host bus interface means 13 in a color data format different from c.

FIG. 7 shows such a sixth embodiment of the present invention.
Video memory 1a in the video memory stack 11 when displaying a plurality of windows in the data display device according to
FIGS. 3A to 3C are conceptual diagrams showing the states of FIGS. 1A to 1C, and the corresponding parts are denoted by the same reference numerals as in FIG. 2 and description thereof is omitted. In the figure, 2
2a, 22b, and 22c are provided corresponding to the respective video memories 1a to 1c. The pixels 2a, 22b, and 22c are arranged between the host bus interface unit 13 and the video memories 1a to 1c. The color data format of the data 16a to 16c is stored in the corresponding video memory 1a to 1c in the video memory stack 11.
This is a color pallet that performs data conversion to match the color data format of the pixel data 16a to 16c stored in 1c. Reference numerals 23a, 23b, and 23c are pixel data conversion tables prepared corresponding to the respective color pallets 22a to 22c, and each of the color pallets 22a to 22c holds conversion data used for conversion of a color data format. .

Next, the operation will be described. The pixel data 16a to 16c on the video memories 1a to 1c of the windows displayed on the monitor screen via the video synthesizing means 14.
Is different from the color data format of the pixel data 16a to 16c to be displayed, which is transferred via the host bus interface means 13, and the pixel data 16a to be displayed.
16c to the video memory 1a-1
The conversion data for converting the pixel data 16a to 16c on C into the color data format is transferred via the host bus interface unit 13. The conversion data for converting the color data format transferred via the host bus interface means 13 is stored in each video memory 1a.
1c are stored in the pixel data conversion tables 23a to 23c associated with the color palettes 22a to 22c.

Next, the pixel data 1 of the window to be displayed
Processing for writing 6a to 16c into the video memories 1a to 1c is performed. The pixel data 16a to 16c are input via the host bus interface 13 and sent to the color pallets 22a to 22c. Color palette 22
In a to 22c, the color data format of the pixel data 16a to 16c transferred from the host bus interface unit 13 is converted using the conversion data stored in the color data conversion tables 23a to 23c associated with the respective data. The data format is converted so as to match the color data format of the pixel data 16a to 16c stored in the associated video memories 1a to 1c. The pixel data 16a to 16c that have undergone this data format conversion are:
The data is written on each of the video memories 1a to 1c.

As described above, according to the sixth embodiment,
The pixel data 16 on the system memory 6 shown in FIG.
The color data format of the video memories 1a to 16c
Even if the color data format of the pixel data 16a to 16c on 1c is different, the color palettes 22a to 22c perform data conversion using the conversion data stored in the pixel data conversion tables 23a to 23c.
Pixel data 1 from host bus interface means 13
An effect is obtained in that the input of 6a to 16c can be performed in a color data format different from the pixel data 16a to 16c stored in the video memories 1a to 1c.

Embodiment 7 FIG. In each of the above embodiments, a case has been described in which the pixel data 16a to 16c stored in the video memories 1a to 1c are drawn on the monitor screen in the same size via the video combining means 14. Alternatively, the pixel data 16a to 16c stored in the video memories 1a to 1c may be enlarged / reduced and drawn on a monitor screen.

FIG. 8 shows such a seventh embodiment of the present invention.
Video memory 1a in the video memory stack 11 when displaying a plurality of windows in the data display device according to
FIGS. 3A to 3C are conceptual diagrams showing the states of FIGS. 1A to 1C, and the corresponding parts are denoted by the same reference numerals as in FIG. 2 and description thereof is omitted. In the figure, 2
4a, 24b and 24c are provided corresponding to the respective video memories 1a to 1c.
1c and the pixel data 16a stored in each of the video memories 1a to 1c.
16c is a data enlarging / reducing means for performing an enlarging / reducing process in accordance with a designated ratio and transferring it to the video synthesizing means 14.

Next, the operation will be described. Pixel data 16a to 16c stored in video memories 1a to 1c
When drawing pixel data 16a-16c on the video memories 1a-1c on the monitor screen, the enlargement / reduction ratio when the pixel data 16a-16c on the video memory 1a-1c is actually drawn on the monitor screen is set via the host bus interface means 13. Then, the pixel data 16a to 16c are set in the data enlarging / reducing means 24a to 24c connected to the video memories 1a to 1c of the transfer destination. Next, the pixel data 16a to 16c to be displayed are written to the designated transfer destination video memories 1a to 1c.

When displaying the pixel data 16a to 16c on the monitor screen, first, the pixel data 16a to 16c on the video memories 1a to 1c are converted by the data enlarging / reducing means 24a to 24c.
The video data is transferred to the video synthesizing means 14 via 24c. At this time, the data expansion / reduction means 24a to 24c
If the reduction ratio is set, the display image on the monitor screen is enlarged or reduced according to the enlargement or reduction ratio. The pixel data 16a to 16c that have been subjected to the enlargement / reduction processing are transferred to the video synthesizing unit 14, where they are synthesized and drawn on a monitor screen.

As described above, according to the seventh embodiment,
Since the enlargement / reduction processing is performed when the pixel data 16a to 16c are drawn, the enlargement / reduction processing is performed on the video memories 1a to 1c.
There is no need to write the drawn image after the reduction again, and an effect that only a specific window can be drawn while being enlarged or reduced can be obtained.

In the above embodiments, the case where each means is operated independently is described. However, it is needless to say that these means may be operated in combination. In this case, a result obtained by combining the above processes is obtained.

[0055]

As described above, according to the present invention, a plurality of video memories are hierarchically stored in a video memory stack, managed in a stack format, and the order of the video memories is changed by updating the display position information. Then, since the pixel data of each video memory is synthesized by positioning on the monitor screen according to the order of the video memory in the video memory stack, the pixels of the portion hidden by the overlap of the windows displayed on the monitor screen When saving data or drawing a hidden part again, there is no need to write pixel data to the video memory for that purpose, and a data display that allows multiple windows to be drawn on the monitor screen at high speed There is an effect that the device can be obtained.

According to the present invention, when a new window is drawn on the monitor screen, a new video memory is secured, and the pixel data and the display position information of the pixel data on the monitor screen are stored therein. Since the video memory is located at the top of the video memory stack, the newly drawn window is drawn on the front of the monitor screen without saving or destroying the pixel data of the window that was being displayed until then. There is an effect that it becomes possible to do.

According to the present invention, only the display position information of the pixel data on the monitor screen, which is added to the video memory, is changed. There is an effect that the window can be moved without saving or destroying the data of the window and without re-transmitting the pixel data of the window moving to the new display position.

According to the present invention, when a window is erased, only the video memory holding the pixel data of the designated window is deleted from the video memory stack, so that it is hidden by the window to be deleted. Without re-transmitting the pixel data of the area
The effect is that the contents of the specified window can be destroyed.

According to the present invention, the pixel data read from the video memory is processed by the predetermined arithmetic processing and then transferred to the video synthesizing means.
There is an effect that various windows can be displayed, such as simultaneous display of a lower window and a translucent upper window, and chroma key display.

According to the present invention, the window identifier indicating the video memory of the transfer destination added to each pixel data is determined, and the pixel data is written to the specified video memory. This has the effect that the contents of windows that are hidden below or only partially displayed can be updated.

According to the present invention, since the transfer processing of the pixel data on the video memory to the video synthesizing means is controlled and selected by the data selecting means, the display of a specific window is suppressed, and the video memory is controlled. There is an effect that it is possible to display only the specific area above.

According to the present invention, the pixel data input from the host bus interface means is compressed and stored in the video memory, and the pixel data read from the video memory is decompressed and transferred to the video synthesizing means. With the configuration, the amount of pixel data on the video memory is reduced, and the video memory can be reduced in capacity.

According to the present invention, when pixel data is written to the video memory, the color data format of the input pixel data is converted into the same color data format as the pixel data on the video memory. Because
There is an effect that the pixel data can be input in a color data format different from the pixel data stored in the video memory.

According to the present invention, the pixel data read from the video memory is enlarged / compressed in accordance with the specified ratio.
Since the image data is configured to be reduced and transferred to the video synthesizing means, it is possible to draw only a predetermined window by enlarging / reducing, without writing the enlarged / reduced pixel data in the video memory. This has the effect.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a data display device according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram illustrating display of a plurality of windows according to the first embodiment.

FIG. 3 is a conceptual diagram illustrating display of a plurality of windows according to a second embodiment of the present invention.

FIG. 4 is a conceptual diagram illustrating display of a plurality of windows according to a third embodiment of the present invention.

FIG. 5 is a conceptual diagram illustrating display of a plurality of windows according to Embodiment 4 of the present invention.

FIG. 6 is a conceptual diagram illustrating display of a plurality of windows according to a fifth embodiment of the present invention.

FIG. 7 is a conceptual diagram illustrating display of a plurality of windows according to a sixth embodiment of the present invention.

FIG. 8 is a conceptual diagram illustrating display of a plurality of windows according to a seventh embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of a conventional data display device.

[Explanation of symbols]

1a, 1b, 1c video memory, 2 host bus, 4
Monitor, 11 video memory stack, 12 video memory management means, 13 host bus interface means, 14 video synthesis means, 15a, 15b, 15c
Window, 16a, 16b, 16c pixel data, 1
7a, 17b, 17c Calculation means, 18a, 18b, 1
8c window identifier determining means, 19a, 19b, 1
9c data mask circuit (data selection means), 20a,
20b, 20c Data compression means, 21a, 21b, 2
1c Data expansion means, 22a, 22b, 22c color palette, 23a, 23b, 23c Pixel data conversion table, 24a, 24b, 24c Data expansion / reduction means.

Claims (10)

[Claims] 1. Each of which is displayed on a screen on a monitor.
A plurality of video memories that hold pixel data for a window and to which information indicating a display position of the pixel data on the screen of the monitor is added; and a plurality of the video memories are hierarchically associated with the display positions of the windows. A video memory stack to be stored, host bus interface means for providing an interface between a plurality of the video memories and a host bus, and a display position of the pixel data held in the video memory on a monitor screen. A video memory management means for updating the information shown to change the order of the video memories in the video memory stack; and a plurality of the pixel data held by the video memories.
A video to be synthesized such that a window based on pixel data on the video memory positioned at an upper position of the video memory stack is on the front of the monitor screen, and a window based on pixel data on the video memory positioned on a lower position is on the back of the monitor screen. A data display device comprising a synthesizing unit. 2. When a new window is displayed on a monitor, the host bus interface means secures a new video memory, writes pixel data of the window to be displayed, and displays the pixel data on the monitor screen. 2. The data display device according to claim 1, wherein information indicating a display position is added, and the video memory is positioned at the top of the video memory stack. 3. The monitor according to claim 1, wherein the video memory management means changes the display position of the window on the monitor screen, and the video memory management means adds the relevant pixel on the monitor screen to the video memory holding the pixel data of the window. 3. The data display device according to claim 1, wherein only information indicating a data display position is changed. 4. When the video memory management means discards the contents of the window displayed on the monitor screen,
4. A data display according to claim 1, wherein only the video memory holding the pixel data of the designated window is deleted from the video memory stack. apparatus. 5. The image processing apparatus according to claim 1, further comprising a processing unit that performs processing by a predetermined calculation on the pixel data stored in each video memory, and transfers the processed pixel data to a video combining unit. The data display device according to any one of claims 1 to 4. 6. A window identifier which determines a window identifier indicating a transfer destination video memory added to pixel data of each window and writes the pixel data to a specified video memory based on a result of the determination of the window identifier. 2. The apparatus according to claim 1, further comprising a determination unit.
The data display device according to any one of claims 1 to 5. 7. A method for transferring pixel data on a video memory to a video synthesizing unit, the data selecting unit transferring only data in a display area in the pixel data on the video memory to the video synthesizing unit. The data display device according to any one of claims 1 to 6, wherein: 8. A data compression means for compressing pixel data input from the host bus interface means and storing the compressed data in a corresponding video memory in a video memory stack, and a compressed data read from the video memory. 8. The data display device according to claim 1, further comprising a data decompressing unit that decompresses the pixel data in the state and transfers the decompressed pixel data to the video synthesizing unit. 9. A color palette for converting the color data format of the pixel data input from the host bus interface means into the same color data format as the pixel data on the corresponding video memory in the video memory stack; 9. A pixel data conversion table, which is prepared in correspondence with the above, and has a color data palette that holds conversion data used for conversion of the color data format. The data display device according to the above. 10. A data enlargement / reduction means for enlarging / reducing pixel data stored in each video memory in accordance with a designated ratio and transferring the data to a video synthesizing means. The data display device according to claim 9.