JPH03246767A - Managing method for memory for data display - Google Patents

Abstract

PURPOSE:To eliminate display latency time for page loading by automatically performing the deletion of a page and the pre-reading of it interlocking with window opening for data display and page turning in the same data. CONSTITUTION:Data consisting of plural pages are read out from a hard disk 28 to buffer memories 20-27, and are transferred to video memories 12-19, and one page per data is displayed on a data display part 11 simultaneously, and when a certain page in the data is displayed by performing the page turning, a prescribed number of displayed pages are deleted from the buffer memories 20-27 for page display, and the same number of pages is pre-read. The data in the memories 20-27 are deleted considering window priority and the history of the page loading centering the page being displayed of the data being opened at present at every instruction of data display or occurrence of the page turning in the same data, which releases the memories 20-27, and the pre-reading of the page is performed in the memory. In such a way, the display time of the page can be shortened.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has a data storage unit, a data display unit, and a plurality of page display buffer memories, and a plurality of data is transferred from the data storage unit to the page display buffer memory. A document display device having a multi-window function that reads out one page per document and displays it simultaneously on a document display section, one page at a time, and that reads in advance to display a certain page of the document by turning the page. Concerning memory management methods.

[Conventional technology]

Conventionally, as a page display memory management method for a document display device with a multi-window function, when the product of the number of documents and the number of materials exceeds the number of pages in the page display buffer memory, a fixed number of pages corresponding to the number of memory surfaces is first set. A method is adopted in which fixed negative numbers are loaded from a hard disk or the like, and when a page that is not in memory is designated by a page turn by a user operation or an instruction to display another material, a fixed negative number is loaded again from that page.

[Problem to be solved by the invention]

The above-described conventional document display memory management method has disadvantages in that it takes a long display time due to page loading that occurs when pages are turned, and the user interface is poor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data display memory management method that reduces page display time.

Means for Solving Problem 121] In the material display memory management method of the present invention, the currently displayed page is set as n, and pages are turned in the direction of older numbers for materials excluding the material with the highest window priority. In the case n-i, ... n-1, n+j, ..., n+1 (
However, i and j are positive integers of 1 or more) discarded in page order,
When turning pages in the direction of smaller numbers, n+j,...
Criterion 1 discards pages in the order of n+1, n-i, ... n-1; Criterion 2 discards pages of materials with the lowest window priority if there are pages with the same order in criterion 1; If you want to turn the pages in the direction of the highest number for the highest material, use n-i,...
・, n-1, n+j, ..., discard in page order of n+1,
When turning pages in the direction of smaller numbers, n+j,...
A priority order is established consisting of Criterion 3, which discards pages in the order of n+1, n-i, -, n-1, and Criterion 4, which discards the currently displayed page in descending order of window priority, and allows multiple documents to be opened at the same time. As a result, pages corresponding to the number of insufficient memory surfaces are applied in the order of criteria 1, criteria 2, criteria 3, and criteria 4, and then discarded.

[For production]

Each time a document display instruction or a page break occurs within the document, the document is discarded from memory based on the currently displayed page of the currently open document, taking into account the window priority and page load history. Since the page is prefetched at that point, the page display time is shortened.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a block diagram of an embodiment of a data display device to which the data display memory management method of the present invention is applied, and Fig. 2 shows page turning from the first page in the direction of increasing page numbers and up to four pages. Buffer memory 20 for page display when two documents are opened at the same time
It is a figure showing the contents of ~27. Note that the middle section in FIG. 2 indicates the page currently being displayed.

The material display device of this embodiment includes a material display section 11, video memories 12, 13 . . . , 19, page display buffer memories 20, 21 . . . , 27, a hard disk 28 as a data storage section, video memories 12 to 19, page display buffer memories 20 to 27, and a control section 29 that controls reading/writing of the hard disk 28. A document consisting of pages is read from the hard disk 28 to the page display buffer memories 20 to 27 and then stored in the video memory 1.
2 to 19, and simultaneously display one page per document on the document display section 11, and when displaying a certain page of the document by turning the page, a predetermined number of pages from the page display buffer memories 20 to 27 are displayed. The displayed page is discarded and the same number of pages are read in advance.

Next, the operation of this embodiment will be explained using an example in which pre-reading is performed up to 2 pages and displaying pages are stored only 1 page.

When the user instructs the displayed material D1, the control unit 2
9 reads the first page pH from the hard disk 28 and stores it in the page display buffer memory 20 and at the same time stores it in the video memory 12, so that the first page pH is displayed on the display section 11.
The second page P12 and the third page P, 3 are read out from the hard disk 28 regardless of the presence or absence of a second page display instruction from the user, and are stored in the page display buffer memory 2.
1.22 (Figure 2 (1)). When the user turns the page and instructs to display the second page PI2, the control unit 29 copies the second page P1□ from the page display buffer memory 21 to the video memory 12, thereby displaying the second page on the display unit 11. Then, the fourth page P, 4 is read out from the hard disk 28 and stored in the page display buffer 1 memory 23 (FIG. 2 (2)). When the user instructs to display the document D2 in this state, the control unit 29 displays the first page P21.
is read from the hard disk 28 and stored in the page display buffer memory 24 and simultaneously stored in the video memory 13, the first page P2□ is displayed on the display section 11,
Thereafter, the second page P22 and the third page P23 are read from the hard disk 28 and stored in the page display buffer memory 25 respectively.
．． 26 (Fig. 2 (3)). In this state, when the user instructs to display document D3, the control unit 29 displays the first page p.
3t is read from the hard disk 28 and stored in the page display buffer memory 27 and simultaneously stored in the video memory 14, so that the first page P31 is displayed on the display section 11. That t-mugi, page 2 from hard disk 28 P3□
Because two pages of memory are insufficient to prefetch the third page P33, the control unit 29 selects the previous page, which is the only previous page, among all the documents excluding document D3, which has the highest window priority, and D2. The first page pH and the fourth page P14, which has the lowest window priority among the next and next pages, are discarded, and the second page P32 and third page P33 are read from the hard disk 28 and stored in the page display buffer memory 20 and 23, respectively. Store it (Figure 2 (4)). In this state, when the user turns the page and instructs to display the second page P32, the control unit 29 transfers the page display buffer memory 20 to the video memory 1.
4, the second page P32 is displayed on the display section 11 (FIG. 2 (5)). After that, there is not enough memory for one page to prefetch the fourth page P, 4, so there is no previous page in each of the materials except the material D3 with the highest window priority, and the control unit 29 discards the third page P23, which is the only subsequent page, and reads the fourth page P34 from the hard disk 28 and stores it in the page display buffer memory 26 (FIG. 2 (5)).

Table 1 shows a memory management table for instructing the display of material D4 in this state.

(Margin below) In Table 1, the window priority is for reference only.

is the lowest, and Material D2. D3. ..., and document D8 is the highest.

When document D4 is opened, the first page P41 is displayed, and the second page P41 is displayed.
42 and the third page P43 are read in advance. Since three memory areas are added, first, the previous page (n-1) entry is searched from the lowest window priority and the first page P31 is discarded.

Next, the next page (n+2) is searched for from the lowest window priority and the fourth page P34 is discarded. The third page, P43, is the document D4 with the highest window priority.
, so it is not discarded, but the item on the next page (n+1) is searched for from the lowest window priority and the third page PI3 is discarded. As a result of the above, page display buffer memory 20 to 2
The contents of 7 are as shown in Figure 2 (6).

Below, discard and read ahead will be discussed in the same way. If eight documents are opened, the page display buffer memories 20 to 27 will be filled with only the currently displayed page, so if the ninth document is opened, the document with the lowest window priority will be displayed. The middle pages are discarded and no pre-reading is performed.

When turning pages in the direction of smaller numbers, the process is basically the same except that the page is discarded or read ahead in the opposite direction.

(Effects of the Invention) As explained above, the present invention provides a window oven for displaying materials, and a window oven for displaying materials. In addition, as long as you do not open the document window on top of the memory capacity, you will not be able to load the page again if you specify to display the previous page after loading the page as in the conventional method. This has the effect of making it possible to realize a comfortable user interface.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of a data display device to which the data display memory management method of the present invention is applied, and Fig. 2 shows page turning from the first page to the highest page numbers and up to four pages. Buffer memory 20 for page display when two documents are opened at the same time
It is a figure showing the contents of ~27. 11... Material display section, 12-19... Video memory, 20-27... Buffer memory for page display, 28...
Hard disk, 29...control unit,

Claims (1)

[Scope of Claims] 1. It has a data storage unit, a data display unit, and a plurality of page display buffer memories, and reads out a plurality of data consisting of a plurality of pages from the data storage unit to the page display buffer memory, and reads each data item from the data storage unit to the page display buffer memory. 1
This is a document display device that has a multi-window function that simultaneously displays pages on the document display section, and when displaying a certain page of the document by turning the page, a predetermined number of displays are displayed from the page display buffer memory. Discard the completed pages,
In a document display device that reads the same number of pages in advance, if the currently displayed page is n, and pages are turned in the direction of older numbers for documents excluding the document with the highest window priority, n-i...・, n-1, n+j,...
When discarding pages in the order of n+1 (where i and j are positive integers greater than or equal to 1) and turning pages in the direction of smaller numbers, n+j,
. . . , n+1, n-i, . . . , n-1. Criterion 1 is to discard pages in the order of page order. Criterion 2 is to discard pages of materials with the lowest window priority if there are pages with the same order in criterion 1. and when turning pages in the direction of the highest number for the document with the highest window priority, n-
When discarding pages in the order of i,..., n-1, n+j,..., n+1, and turning pages in the direction of smaller numbers, n+j,
..., n+1, n-i, ..., n-1, and criterion 4, which discards the currently displayed page in descending order of window priority. A memory management method for displaying materials in which pages corresponding to the number of memory surfaces that are insufficient due to simultaneous opening of materials are applied and discarded in the order of criteria 1, criteria 2, criteria 3, and criteria 4.