JPH02178696A - Graphic data control system - Google Patents

Abstract

PURPOSE:To shorten the saving and restoring processing time of attribute information and to improve the display processing performance for graphic data by saving and restoring only attribute information which is updated actually in graphic display attribute information which is provided for each graphic definition as an individual unit of graphic data. CONSTITUTION:When graphic data having hierarchic structure wherein while a display instruction group consisting of display instruction statements is executed, another display instruction group is called and executed is displayed, only graphic display attribute information to be updated is saved in a standby area 8 at the time of calling the called display instruction group and updating original graphic display attribute information. Then when the execution of the called display instruction group is completed and execution control returns to the calling origin display instruction group, graphic display attribute information on only the part updated by a saving the restoring processing control part 4 is taken out and the state of a display execution part 2 is restored to a state right before the calling origin display instruction group calls another display instruction group. Consequently, the amount of data of saved graphic display attribute information is reduced, the capacity of the standby area is decreased, and the saving the restoring processing time is shortened.

Description

[Detailed description of the invention] [Industrial application field] The present invention allows graphic data to be defined in a hierarchical structure.

The present invention relates to a graphic data management method in a graphic display processing device that performs graphic drawing.

(Prior Art) Conventionally, in the display processing of graphic data having a hierarchical structure, it has been necessary to save and save graphic display attribute information for each unit of one graphic definition.
A stack pointer indicating the data storage position in the storage area of the saved data was used to execute the recovery process for all graphic display attribute information data at once.

This conventional method is adopted in Hitachi's new ES-330, and is also used in PIXEL Nα33 from page 192 to 1.
The graphic data file structure of the graphic display described on page 96 employs this conventional method.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, when displaying graphic data that has a hierarchical structure, no consideration is given to the processing time for saving and restoring graphic display attribute information for each unit of graphic definition. Since the amount of data to be saved during the recovery processing time is large, it can no longer be ignored in terms of graphic data display processing performance.

There was a problem that the drawing speed of figures with deep hierarchical levels was slow.

An object of the present invention is to improve graphic data display processing performance by shortening the processing time for saving and restoring attribute information.

[Means to solve the problem]

We note that there are few forms in which the shape display attribute information for each shape definition, which is an individual unit of shape data, is usually significantly updated and used as a definition of shape data with a hierarchical structure. The amount of data to be saved and restored is reduced by saving and restoring only attribute information.

Through the above, the above objective is achieved. Furthermore, it is possible to reduce the capacity of the evacuation area.

[Effect]

The display instruction processing section 5 existing inside the display execution section 2 operates as shown in FIG. When it is detected that it is the final imperative, data recovery processing is performed for all the attribute information saved up to now in the current attribute table 6,
If it detects that it is a call instruction for a group of display commands defined by another figure, it performs the call process for the group of display commands defined, and if it detects that it is a display attribute definition command, and if this attribute definition command is in the top hierarchy. If it has not been issued in the display command group, the newly defined attribute information in the curse attribute table 6 is saved to the save area 8, and then the saved attribute information is updated in the current attribute table 6, and the display attribute definition is If it is detected that the command is a command, and this attribute definition command has been issued in the display command group of the highest hierarchy, the newly defined attribute information is updated in the current attribute table 6 without saving it. If one or more of the four cases does not apply, the process corresponding to the referenced instruction is executed.

And this is done repeatedly.

As a result, only the data whose graphic display attribute information has been updated is saved and restored.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 2 shows the configuration of this embodiment.The configuration includes a current attribute table 6 that manages and stores current attribute information, a save area 8 that temporarily stores graphic display attribute information, and a save area on the save area 8. A stack pointer 7 that indicates the storage location of the attribute information data that has been displayed, and a frame pointer that indicates the address in the save area 8 where the previous main text is stored every time a calling instruction that calls another display instruction group is executed. Saving possibility determination flag 3, which is a collection of flags that determines whether or not the attribute information data of the location 33 has been saved.
Has 1.

To explain the contents of this embodiment, when a call instruction for a group of display commands that define another figure is executed, the value of the current save possibility determination flag and the value of the frame pointer are saved to the save area 8, and All determination flags 31 are cleared. In addition, each time a display attribute definition command is processed, it is determined whether the save possibility determination flag 31 is set to a flag corresponding to data with newly defined attributes, and if the data is in the set state, that is, if the data is For example, the attribute information data on the current attribute table 6 is updated without performing the attribute information saving process. If the reset state is reached, that is, the data has not been saved, this flag is set and the data of the attribute information of the current attribute table is saved onto the save area 8, and the stack pointer 7 is incremented every time data is saved. After that, the data of the current attribute information is updated.

Next, when a display command is executed that specifies that it is the last of a group of display commands that define a figure, the frame pointer 33
The attribute information data is restored from the save area 8 onto the current attribute table 6 until the value of the stack pointer 7 and the value of the stack pointer 7 match. Note that the value of the stack pointer 7 is decremented each time data is recovered. If the values of the frame pointer 33 and the stack pointer 7 match, the value of the frame pointer and the value of the save possibility determination flag that were saved when the call instruction of the display instruction group was previously executed are restored.

FIG. 3 is a diagram summarizing the above processing operations.

Here, the data format of the attribute information to be saved is the start address 30 of the save attribute data indicating the start address of the data to be saved in the current attribute table 6, and the save attribute data 32 which is the data of the attribute information to be saved. By defining the number of attribute data to be saved as 50 indicating the length of the attribute information data to be saved, it is possible to recognize which location of the attribute information data has been saved.

This relationship is shown in FIG.

FIG. 5 is a diagram illustrating the flow of data in the save area 8 in which the attribute information in this embodiment is specifically saved as described above.

FIG. 5 will be explained.

(a) shows the initial state of the evacuation area 8. In (b), a call instruction for a group of display instructions defining another graphic is executed, and the state is at the end of processing, and at this point, the values of the frame pointer 33 and the stack pointer 7 are the same.

Here, 60 is the value of the saved evacuation determination flag, and 61 is the value of the saved frame pointer. (C) shows the state after one display attribute definition command has been executed from the point in time (b).

Only stack pointer 7 is incremented. Further, 62 is the data of the attribute information saved by the display attribute definition command.Next (d) shows the time when the display attribute definition command is executed again from the time point (c). As in (C), it can be seen that only the stack pointer 7 is incremented. Finally, (e) is (d
) indicates the state when a call command for a display command group that defines another figure is newly executed, and the values of the save possibility determination flag and frame pointer are each newly saved to 64.65. be done.

According to this embodiment, by saving the values of the frame pointer and the evacuation determination flag, there is no need to perform decrement processing for the frame pointer and reset control of the evacuation determination flag during attribute information recovery processing. This has the effect of shortening the recovery processing time.

〔Effect of the invention〕

According to the present invention, the amount of data of graphic display attribute information saved in the save area 8 is reduced compared to the conventional method, and the capacity of the save area and save/recovery processing time are reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the schematic configuration and processing method of the present invention;
FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is an explanatory diagram of operation, and FIG. 4 is a supplementary explanatory diagram of FIG. 2. FIG. 5 is a diagram showing a specific example of the operation contents of this embodiment. 7...Stack pointer, 8...Evacuation area, 9~
11... Collection of saved attribute information, 30... Start address of saved attribute data, 31... Saving possibility determination flag, 32... Saved attribute data, 33... Frame pointer, 34, 42, 60, 64... Saved save availability determination flag, 35, 43, 61.65... Saved frame pointer, 50... Number of saved attribute data.

Claims (1)

[Claims] 1. A display command storage section (1) that stores display instructions for graphic display, a save area (8) that temporarily stores graphic display attribute information, and a current attribute that manages the current attribute information. It has an evacuation/recovery processing control unit (4) that performs evacuation and recovery processing of the table (6) and evacuation area (8), and a display instruction that refers to and processes the display instruction statement in the display instruction storage unit (1). A display execution section (2) consisting of a processing section (5) and an output display section (3) that outputs and displays the execution results of the display execution section (2).
When displaying graphic data with a hierarchical structure in which a group of display commands consisting of one or more display command statements is executed, another group of display commands is called and executed in a graphic drawing device consisting of the following: When the called display command group updates the graphic display attribute information at the time of calling the calling display command group, only the updated graphic display attribute information is saved by the save (17)/recovery processing control unit (4). Area (8
) (21), and when execution of the called display command group is finished and execution control is returned to the calling display command group, the evacuation/recovery processing control unit (4) is stored in the evacuation area (8).
extracts all the graphic display attribute information of only the updated part up to this point and restores the state of the display execution unit (2) to the state immediately before the calling display command group called another display command group. A graphic data management method that is characterized by the ability to