JPH04128883A - Drawing system of display device - Google Patents

Abstract

PURPOSE:To speed up drawing operation by inputting display attribute data as an address of a control table and obtaining a corresponding registration destination address and corresponding drawing instruction data, and then reading pattern data out of a composite pattern memory. CONSTITUTION:Screen data is read out of a logical screen buffer 21 and the registration destination memory address of a character pattern memory 24 is obtained from a character code in the data. Then the display attribute data is used as the address to access the control table 12, the registration destination memory address and drawing instruction data in the composite pattern memory 11 are obtained, and those two pairs of addresses and drawing instruction data and further other drawing information are outputted to a bit mover 25. The bit mover 25 takes the corresponding character pattern data and composite pattern data out and puts them together and performs arithmetic processing with drawing instructions to drawn an image in a specific area on a bit map memory 27.

Description

[Detailed Description of the Invention] [Summary] Regarding a drawing method that draws multiple types of fixed patterns in the same display area, the aim is to draw at high speed, and in a display device that displays characters with display attributes, it is possible to A combination pattern memory that stores in advance various combination pattern data obtained by combining pattern data of plural types of first display attributes related to character patterns among the display attributes in different combinations; Display attribute data consisting of a second display attribute related to a drawing method is input as an address, and a registration destination address in the composite pattern memory of composite pattern data corresponding to the first display attribute in the input address is input. and a management table storing drawing command data corresponding to the second display attribute, respectively, and inputting the display attribute data as an address into the management table based on the drawing pattern designation information. and drawing means for inputting the registration destination address into the synthetic pattern memory and thereby drawing the synthetic pattern data read from the synthetic pattern memory based on the drawing command data obtained from the management table. Configure.

[Industrial application field]

The present invention relates to a drawing method in a display device, and particularly to a drawing method for drawing a plurality of types of fixed patterns in the same display area.

When displaying characters on a screen, a character pattern is drawn in the display memory (bitmap memory) using a rectangular area transfer device (hereinafter referred to as a bit mover) in units of screens (character logical screens) divided by rows/columns. method is used.

When drawing multiple types of display attributes along with character patterns on this screen, it takes time to draw one character when determining the bits of each attribute individually and instructing the bit mover to draw them. . Therefore, there is a need for a drawing method that speeds up the drawing of multiple patterns in the same display area.

[Conventional technology]

FIG. 4 shows a configuration diagram of an example of a drawing method in a conventional display device. In the figure, 21 is a logical screen buffer in which screen data to be displayed is stored in units of logical screens. This stored screen data includes character codes and display attributes.
Furthermore, display attributes include ■Shading settings, shading type, and overline.

There are attributes related to character patterns such as underline, vertical ruled line, and ruled line type, and (2) attributes related to drawing methods such as inversion and transparency/opaque.

22 is a display control section, 23 is a font management section, and 24 is a character pattern memory. The display control unit 22 notifies the font management unit 23 of the character code sent from the logical screen buffer 21 to acquire the address of the character pattern memory 24, and also acquires the address of the character pattern memory 24, and also updates the display attribute code sent from the logical screen buffer 21. One of them is selected and the address of the attribute pattern memory 26 is acquired, and these addresses are further notified to the bit mover 25 as drawing information along with the screen size, display area (XY coordinates), etc.

That is, the display control unit 22 first obtains the address of the attribute pattern (the address of the character pattern memory 24) from the variable CatrO (step 51), according to the processing flowchart shown in FIG. Here, as mentioned above, the display attributes include attributes related to character patterns and attributes related to drawing methods, of which the former is indicated by the 6-bit variable catro as shown in Figure 6, and the latter is indicated by catr ] in the same figure. It is expressed as a two-pit variable.

As shown in FIG. 5, the display control unit 22 then changes the variable cat
Step 52) to determine whether the value of bit 0 of rt is "0" or "1"; if "l", determine whether the value of the next bit 1 is "0" or "1" (step 53); Even if the value of bit 0 is “0”, the value of the next bit 1 is “0”
It is determined whether the value is "1" (step 54). As a result, when the 2 bits of the variable catr 1 are "11", a drawing command is set in the bit mover 25 to synthesize the reverse of the storage destination data and the composite data of characters and attribute patterns (Step 55), "lO" If it is "01", set the drawing command to synthesize the reverse data of the composite data of the character and attribute pattern (step 56), and if it is "01", set the bit mover 2.
In step 57), set a drawing command to synthesize the data in the storage destination and the composite data of characters and attribute patterns.
00'', a drawing command for synthesizing characters and attribute patterns is set in the bit mover 25 (step 58).

By setting this drawing command, the bit mover 25 scans and reads out the character pattern memory 24 and the attribute pattern memory 26, respectively, and synthesizes each pattern data.
If the attribute related to the drawing method is "reverse", the inverted data is written to the bitmap memory 27, and if it is "inverted 1 synthesis", the inverted data of the composite pattern data and the stored pattern data in the bitmap memory 27 (data at the storage destination) are written.
The bitmap memory 27 is synthesized with the readout data.
write to.

Hereinafter, in the same manner as above, if there are other display attributes, the bit mover 2
Access 5. As a result, characters displayed in the same area are sequentially drawn in an overlapping manner for each display attribute. In other words, even if underlining and shading are specified, they will not be drawn at the same time, but will be drawn sequentially.

Note that if enlargement/reduction is specified, the font management unit 23 reads the character pattern from the character pattern memory 24 into the work area, and uses the enlarged/reduced work area as a pattern memory address in the display control unit. Notify 22. In this case, during the enlargement/reduction process, two sets of attribute pattern memory addresses are acquired and the attribute pattern is drawn first.

[Invention or problem to be solved]

However, in the conventional drawing method described above, each display attribute is individually determined, and the attributes related to the drawing method, such as pattern inversion, are determined bit by bit and then the drawing command is set to the bit mover 25. There is a problem in that it takes time to draw characters, especially when displaying in full screen or scrolling.

The present invention has been made in view of the above points, and an object of the present invention is to provide a drawing method for a display device that can perform drawing at high speed.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a display device for displaying characters with display attributes, as shown in the principle block diagram of FIG.
It is characterized in that it is configured to include a drawing means 13 and a drawing means 13.

Here, the composite pattern memory 11 stores a plurality of first types of character patterns among display attributes other than character codes.
Various types of composite pattern data are stored in advance, which are obtained by combining pattern data of display attributes in different ways.

In addition, the management table 12 receives display attribute data consisting of a first display attribute and a second display attribute related to a drawing method as an address, and a composite pattern of composite pattern data corresponding to the first display attribute in the input address. memory 1
1 and the drawing command data corresponding to the input second display attribute are respectively stored.

Further, the drawing means 13 inputs the display attribute data as an address into the management table 12 based on the drawing pattern designation information, thereby inputting the registration destination address obtained from the management table 12 into the composite pattern memory 11, thereby The composite pattern data read from the pattern memory 11 is drawn based on the drawing command data obtained from the management table 12.

[Effect]

In the present invention, the drawing means 13 inputs display attribute data as an address into the management table 12 based on the drawing pattern designation information, and thereby acquires the corresponding registration destination memory address and drawing command data from the management table 12. Thereafter, the drawing means 13 inputs the registration destination address into the synthetic pattern memory 11, reads out the synthetic pattern data, and draws it according to the drawing command data.

Therefore, in the present invention, drawing can be performed simultaneously using the first and second display attributes based on the drawing pattern designation information.

〔Example〕

FIG. 2 shows a configuration diagram of an embodiment of the present invention. In the figure, the same components as in FIGS. 1 and 4 are denoted by the same reference numerals, and their explanations will be omitted. In FIG. 2, the display control section 28 includes the font management section 23. Together with the bit mover 25, the drawing command register 29, and the drawing information storage register 30, the above-mentioned drawing means 13 is constituted. The display control unit 28 supplies the display attribute data as an address to the management table 12, and thereby receives the registration destination memory address and drawing command data from the management table 12.

The above display attribute data consists of 6 bits of first display attribute data related to the character pattern and 2 bits of second display attribute data related to the drawing method, as shown in FIG.
It is bit data, and each bit is shaded or not,
Indicates WI type (dark/light), presence/absence of overline, presence/absence of underline, presence/absence of vertical ruled line, ruled line type (solid line/dotted line), presence/absence of inversion, and transparent/opaque.
A value of "1" means presence (designation), and a value of "0" means absence (non-designation).

As a result, for example, when a solid underline is inverted or opaque, the display attribute data value is [00010110]
It is expressed as follows. Also, the illustrated example [10011110]
indicates that it is specified as an inverted opaque display attribute with light shading, solid underlining, and vertical ruled lines, and is specified at address (10011110) in the management table 12.
The registered address of the composite pattern memory 11 that stores composite pattern data obtained by combining a light shading pattern, a solid underline pattern, and a solid vertical ruled line pattern is stored, and the inverted and opaque drawing command data is stored. Stored.

Next, the operation of this embodiment will be explained with reference to the processing flowchart shown in FIG. First, the display control unit 28 reads the screen data (drawing pattern designation information) of the drawing target area from the logical screen buffer 21 (step 31 in FIG. 3), and then the font management unit reads the character code in the read screen data. 23 and character pattern memory 24.
(Step 32 of the same)
).

Next, the display control unit 28 accesses the management table 12 using the 8-bit display attribute data in the screen data as an address, and acquires the registration destination memory address of the composite pattern memory If and the drawing command data. 33)
, acquired the above two sets of noatres (character pattern memory 2
49 each registration destination address of the composite pattern memory 11), drawing command data, and other drawing information are sent to the bit mover 25.
(step 34).

As a result, the bit mover 25 applies each input registration destination address to each pattern memory 24 and 25, extracts and combines the corresponding character pattern data and composite pattern data, and further reads them from the composite pattern memory 11. The calculation process of the drawing command is performed based on the drawing command data stored in the register 29 and other drawing information stored in the register 3, and the calculation result is drawn in a predetermined area of the bitmap memory 27 (the third In the diagram, step 3
3).

In this way, according to the present embodiment, a character with a display attribute, in which multiple types of the first display attribute related to the character pattern are specified, and a plurality of types specified of the second display attribute related to the drawing method, is displayed. Since it is possible to draw in the human map memory 27 all at once without having to judge each time,
Can draw at high speed.

〔Effect of the invention〕

As described above, according to the present invention, since the first display attribute related to the character pattern and the second display attribute related to the drawing method are drawn at once, the drawing speed of one character can be made faster than in the past. Therefore, it has the advantage that the display speed can be greatly improved in full-screen display, scroll display, etc., making it suitable.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention; FIG. 2 is a diagram showing the construction of an embodiment of the invention; FIG. 3 is a processing flowchart for explaining the operation of FIG. 2; FIG. 5 is a flowchart of a conventional drawing process, and FIG. 6 is an explanatory diagram of display attributes. In the figure, 11 is a composite pattern memory, 12 is a management table, 13 is a drawing means, 23 is a font management section, 24 is a character pattern memory, 25 is a bit mover, 27 is a bitmap memory, and 28 is a display control section. Fig. 2 Processing flowchart for explaining operation Fig. 3 Conventional drawing processing flowchart Fig. 5 Explanatory diagram of display attributes Fig. 6

Claims (1)

[Scope of Claims] In a display device that displays characters with display attributes, various types of pattern data of a plurality of types of first display attributes related to character patterns, among display attributes other than character codes, are synthesized in different combinations. A composite pattern memory (11) that stores composite pattern data in advance, and display attribute data consisting of the first display attribute and a second display attribute related to the drawing method are input as addresses,
A registration destination address of composite pattern data corresponding to the first display attribute in the input address in the composite pattern memory (11) and drawing command data corresponding to the input second display attribute are respectively stored. management table (12
) and the registration destination address obtained from the management table (12) by inputting the display attribute data as an address into the management table (12) based on the drawing pattern designation information into the composite pattern memory (11). death,
A drawing means (which draws the composite pattern data read out from the composite pattern memory (11) based on the rendering command data obtained from the management table (12)).
13) A drawing method in a display device comprising: