JPH02222080A - Producing/storing system for character string drawing command - Google Patents

Abstract

PURPOSE:To display the character strings at a high speed by storing the character codes in a character code storing part via a host processor and adding a character code store area instruction pointer to show the position of the character code storing area storing the character codes to a produced character string drawing command. CONSTITUTION:When the character codes of a character string which is instructed by a host processor 1 for display are inputted, a character code store means 11 stores the character codes in a character code storing area 10a of a segment memory area 10. A character code segment evolving means 12 refers to an area storing a character font pattern to obtain a character font pattern. The pattern is evolved into plural segment data for production of the segment data on each character of the character string to be displayed. Then a command production means 13 produces a character code store instruction pointer 220 which shows the positions of character codes stored in the area 10a by the OP code 210 and the means 11 and a character string drawing command 200 containing plural segment 230 obtained by the means 12 via the segment evolution result.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for generating and storing character string drawing commands.
In particular, the present invention relates to a method for generating and storing character string drawing commands in a computer graphics system, which generates character string drawing commands and stores them in a segment (a group of graphical elements) storage areas.

[Conventional technology]

Conventionally, there have been two methods for generating and storing this type of character string drawing command, as follows.

First, as shown in FIG. 3(a), the first method is to generate a character string drawing command 31 that has the character code of the character string specified for display as the character code and store it in a segment storage area. It is.

The character string drawing command 31 generated by this method has an operation code (hereinafter abbreviated as OP code), coordinate values (X, Y) of a display reference point, and a character code.

The second method is to refer to the area where the character font button is stored based on the character code of the character string specified for display before generating the character string drawing command, as shown in Figure 3(b). , obtain the character font break of the character code, and insert the character indicating the character font slam into multiple lines consisting of start point/end point information (Information N indicating whether it is a start point or end point) and coordinate values (X, Y). Character string drawing command 32 with multiple line segment data (hereinafter referred to as line segment expansion)
This method generates and stores it in segment storage.

The string drawing command 32 generated in this way is
It has a code and multiple line segment data.

[Problem to be solved by the invention]

The conventional method for generating and storing character string drawing commands described above has the following drawbacks.

First, in the first method, when a character string is displayed on a graphics display using a character string drawing command 31 stored in a segment storage area, the character code in the character string drawing command 31 is expanded into line segments in the graphics processor. This has the disadvantage that the speed at which character strings are displayed becomes slower because additional processing is required.

In addition, in the second method, since the string drawing command 32 does not have a character code, even if an inquiry is made after the string drawing command 32 is stored in the segment storage area, the contents of the current segment, that is, the character The drawback is that the code cannot be known, and segment editing processing such as changing the character string to be drawn cannot be easily performed after the character string drawing command is stored in the segment storage area.

In view of the above-mentioned points, an object of the present invention is to provide a character string to be drawn that can speed up the display speed of character strings, and also allows the contents of character codes to be known even after a character string drawing command is stored in a segment storage area. It is an object of the present invention to provide a method for generating and storing character string drawing commands that allows segment editing processing such as changes to be easily performed.

[Means to solve the problem]

The method for generating and storing a character string one-stroke command of the present invention includes a character code storage means that stores the character code of a character string specified for display in a character code storage area, and a line segment expansion of the character code into line segment data. Character code storage means, line segment data expanded into line segments by the character code line expansion means, and a character code storage area indicating pointer indicating the position of the character code stored in the character code storage area by the character code storage means. A host processor includes a command generation means for generating a string drawing command having The graphics processor includes a character string drawing means that receives a drawing command, skips a character code storage area instruction pointer as dummy data, and draws a character string according to other information in the string drawing command.

[Effect]

In the character string drawing command generation/storage method of the present invention, the character code storage means of the host processor stores the character code of the character string specified for display in the character code storage area, and the character code line segment expansion means stores the character code. A character code indicating the position of the line segment data expanded into line segment data by the command generation means and the character code stored in the character code storage area by the character code storage means. A string drawing command having a storage area instruction pointer is generated, the command storage means stores the string drawing command generated by the command generation means in the segment storage area, and the string drawing means of the graphics processor receives the string drawing command from the host processor. A character string drawing command is received, the character code storage area instruction pointer is skipped as dummy data, and a character string is drawn according to other information in the character string drawing command.

(Example〕 Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a computer graphics system to which a method for generating and storing character string drawing commands according to an embodiment of the present invention is applied. This computer graphics system includes a host processor 1, a graphics processor 2, and a graphics display 3.

The host processor 1 includes a segment storage area 10, a character code storage means 11, a character code line segment expansion means 12, a command generation means 13, and a command storage means 14.

A character code storage area 10a is provided within the segment storage area 10 to store character codes. Note that this character code storage area 10a does not necessarily need to be provided within the segment storage area 10.

The graphics processor 2 includes a character string drawing means 21.

FIG. 2 is a diagram showing the structure of a character string drawing command 200 generated by the command generating means 13.

The character string drawing command 200 is composed of an OP code 210, a character code storage area instruction pointer 220, and a plurality of line segment data 230.

The character code storage area indication pointer 220 is a pointer that indicates the position of the character code stored in the character code storage area 10a by the character code storage means 11.

Each line segment data 230 includes start point/end point information and coordinate values (X
, Y). In the start point/end point information, for example, 0 indicates the start point, and 1 indicates the end point.

Next, the operation of the character string drawing command generation/storage method of this embodiment configured as described above will be explained.

When the character string display function of the computer graphics system is called and the character code of the character string specified for display is input to the host processor 1, the character code storage means 11 stores the character code in the segment storage area IO. It is stored in the storage area 10a.

Next, the character code line segment development means 12 obtains the character font button of the input character code by referring to an area (not shown) in which the character font button is stored, and converts the character font into a plurality of line segments. Expands the data to line segments and generates line segment data for each character in the string specified for display.

Subsequently, the command generation means 13 generates the OP code 210 and the character code storage area 10 using the character code storage means 11.
A character code storage area indicating pointer 220 indicating the position of the character code stored in a, and a character code line segment expansion means 12
A character string drawing command 200 having a plurality of line segment data 230 as a result of line segment expansion is generated.

Character string drawing command 200 by command generation means 13
When the character string drawing command 200 is generated, the command storage means 14 stores the generated character string drawing command 200 in the segment storage area 10.

When the segment storage area 10 becomes full of character string drawing commands 200, the string drawing commands 200 in the segment storage area 10 are transferred from the host processor 1 to the graphics processor 2.

In the graphics processor 2, a character string drawing means 21
However, the character code storage area instruction pointer 220 in the transferred character string drawing command 200 is skipped as dummy data, and the coordinate values of the start and end points of each line segment of the character when displaying the character string from the line segment data 230 are calculated. is determined, and each character of the character string instructed to be displayed based on the OP code 210 is drawn on the graphics display 3 with reference to the start point/end point information.

By the way, the character code storage area instruction pointer 220 in the character string drawing command 200 is dummy data that is skipped in the drawing process in the character string drawing means 21 of the graphics processor 2, but in the host processor 1, it is read from the application program etc. Character code storage area tOa from character string drawing command 200 according to the timing.
It is used to specify the character code at the beginning of segment editing, such as when changing the character string to be drawn.

〔Effect of the invention〕

As explained above, the present invention stores a character code in a character code storage area when generating a character string drawing command in a host processor and stores it in a segment storage area, and adds characters to the generated string drawing command. By having a character code storage area instruction pointer that indicates the location of the character code storage area where the code is stored, character string display processing can be performed at high speed, and the segment storage area for character string drawing commands can be accessed. It is possible to know the character code even after storing tin! This has the effect of making it easier to perform segment W collection processing such as changing character strings.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a computer graphics system to which a method for generating and storing character string drawing commands according to an embodiment of the present invention is applied, and FIG. Figures 3(a) and 3(b) show the structure of a string drawing command generated in the conventional string drawing command generation/storage method, respectively. It is a diagram. In the figure, 1... host processor, 2... graphics processor, 3... graphics display, 10... segment storage area, 10a... character code storage area, 11... character code storage means , 12...Character code line segment expansion means, 13...Command generation means, 14...Command storage means, 21...Character string drawing means, 200...Character string drawing command, 210...OP code , 220 ...Character code storage area instruction pointer, 230
...It is line segment data.

Claims (1)

[Scope of Claims] Character code storage means for storing a character code of a character string specified for display in a character code storage area; character code line segment expansion means for line segment expansion of the character code into line segment data; a character string drawing command having line segment data expanded by a character code line segment expansion means and a character code storage area instruction pointer indicating the position of the character code stored in the character code storage area by the character code storage means; a host processor comprising command generation means for generating a character string drawing command, and command storage means for storing a character string drawing command generated by the command generation means in a segment storage area; A graphics processor including a string drawing means that skips an area indication pointer as dummy data and draws a string according to other information in the string drawing command.
Storage method.