JP2727667B2 - Drawing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] Regarding a method of drawing a repetitive pattern in a display device or a printing device, a display device or a display device that draws a bitmap pattern with a fixed fixed width for the purpose of shortening the drawing processing time In the drawing unit of the printing device, a pattern size determination unit that determines whether the vertical and horizontal size of the pattern given to repeatedly draw is the same as or a divisor of the drawing fixed width, and A pattern developing unit that develops the pattern to a fixed width, and a pattern drawing procedure that draws the pattern from a designated drawing position by the fixed width. When it is a divisor of the fixed width, the drawing is performed after the image is expanded to the fixed width in advance.

[Industrial applications]

The present invention relates to a method of drawing a repetitive pattern in a display device or a printing device of an information processing system.

A display device in an information processing system is required to perform high-speed drawing processing in order to perform more complicated graphic processing.

[Conventional technology]

In a display device, a fixed fixed width (for example,
It is common to draw with 32 dots).

In a conventional display device, a pattern (for example, 16 dots vertically and 16 dots horizontally) smaller than a fixed width (for example, 32 dots) is used.
Dot), and when drawing this repeatedly,
A process of reading data relating to a figure for each pattern and drawing the pattern has been performed.

FIG. 5 is a flowchart showing a drawing process by a conventional drawing method.

In this example, the fixed width of the drawing unit is 32 dots, and the given pattern is 32 dots or less in height and width, and
The drawing process when the divisor is a divisor of 32 (a 1/32 integer) is shown.

The flowchart is written in a format called the YAC method, and the meaning of the flowchart is as follows.

(1) First, it is determined whether the size of the pattern is 32 dots vertically × 32 dots horizontally. The pattern size is 32 dots vertical x
If the width is 32 dots, perform steps (2) to (5),
Otherwise, perform steps (6) to (9).

(2) The storage address of the pattern data and the address of the destination (drawing position) data are set in the register.

(3) From the set destination (drawing position), drawing is performed for one pattern width, and the drawing is performed up to (drawing range width / pattern width) times.

(4) The process of step (3) is performed the same number of times as the pattern height (32 times).

(5) Steps (2) to (4) are performed (drawing height / pattern height) times.

(6) Set the storage address of the pattern and the destination data in the register.

(7) Draw one pattern width from the set destination (drawing position) and perform (drawing range width / pattern width) times.

(8) The process of step (7) is performed the number of times equal to the height of the pattern.

(9) The processing of steps (6) to (8) is performed by (drawing height /
This is performed only) times (pattern height).

[Problems to be solved by the invention]

In the conventional drawing method as described above, even when the size of the pattern is smaller than the fixed width of the drawing unit, the width of the pattern is drawn once, and the smaller the size of the pattern is, the smaller the pattern becomes. Has to be drawn many times, and the number of times of reading and writing of data relating to a figure increases, which causes a problem that processing time is required.

A problem to be solved by the method is to provide a drawing method which solves such a conventional problem.

[Means for solving the problem]

 FIG. 1 is a block diagram showing the configuration of the present invention.

In the figure, reference numeral 11 denotes a pattern size determination unit which determines whether the vertical and horizontal sizes of a pattern to be drawn are the same as or a divisor of the fixed width of the drawing unit.

Reference numeral 12 denotes a pattern developing unit that develops the pattern to the fixed width.

Reference numeral 13 denotes a pattern drawing unit, which draws the pattern at a specified drawing position by the fixed width.

(Operation)

In the present invention, it is determined whether the vertical and horizontal sizes of the pattern to be drawn are the same as the fixed width of the drawing unit, and the vertical and horizontal sizes of the pattern are divisors of the fixed width of the drawing unit. In this case, in the work area of the frame memory, a pattern having a fixed width in the vertical and horizontal directions is developed, and the developed pattern is drawn at a designated drawing position.

For example, the fixed width of the drawing unit is 32 dots, and the given pattern is 16 dots ×
In the case of 16 dots, as shown in FIG.
The pattern is developed into 32 dots × 32 dots in the work area of the frame memory and drawn as a 32 dot pattern.

As a result, the number of times of drawing is reduced, and the smaller the given pattern, the smaller the number of times of processing compared to the conventional method, so that the speed of the drawing process can be increased.

〔Example〕

FIG. 3 is a diagram showing a system configuration of one embodiment of the present invention.

In the figure, reference numeral 1 denotes a bitmap processor, which performs a bitmap pattern drawing process according to an instruction from a higher-level device. The drawing process according to the present invention is performed by the bitmap processor 1 according to a stored program.

Reference numeral 2 denotes a frame memory which stores a bitmap pattern.

A display interface unit 3 converts data stored in the frame memory into display control data and provides the display control data to the CRT display unit 4.

Reference numeral 4 denotes a CRT display unit, which performs display based on given display control data.

FIG. 4 is a flowchart showing a drawing process according to one embodiment of the present invention.

This embodiment shows a drawing process when the fixed width of the drawing unit is 32 dots and the given pattern is 32 dots or less in the vertical and horizontal directions and a divisor of 32 in the vertical and horizontal directions.

 The meanings of the flowcharts are as follows.

First, the size of the given pattern is 32 dots vertically x
It is determined whether it is 32 horizontal dots. If the size of the pattern is 32 dots vertically by 32 dots horizontally, the process jumps to the step without performing any processing, and otherwise performs the step.

The given pattern is developed on the work area of the frame memory into a size of 32 bits in length × 32 bits in width, and the process proceeds to step.

The storage address of the pattern (the storage address of the work area of the frame memory when the step is executed) and the destination (the drawing position on the frame memory) are set in the register.

Draws one pattern width, and writes this to (Drawing area width
Performs only / 32 bits / time.

Perform step processing up to 32-bit height.

Step to process (drawing area height / 32 bits)
Do it only once.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, in drawing a pattern that is a divisor of the fixed width of the drawing unit, the drawing process can be performed at the same speed as the fixed width pattern, and the display performance is improved. Has a significant industrial effect of contributing to

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of the present invention, FIG. 2 is a diagram showing an example of pattern development, FIG. 3 is a diagram showing a system configuration of an embodiment of the present invention, and FIG. FIG. 5 is a flowchart showing a drawing process by a conventional method. In the figure, 1 is a bitmap processor, 2 is a frame memory, 3 is a display interface unit, 4 is a CRT display unit, 11 is a pattern size determination unit, 12 is a pattern development unit, and 13 is a pattern drawing unit.

Claims (1)

(57) [Claims] 1. A drawing apparatus for drawing a pattern having a fixed size as a drawing unit, wherein whether the input pattern has a size equal to the drawing unit or a size that is a divisor of the drawing unit is determined. A pattern size determining unit for determining, generating a plurality of the input patterns when the size of the input pattern is a divisor of the drawing unit;
A pattern generation unit that expands to have a constant value; and, if the size of the input pattern is equal to the drawing unit, draws the input pattern, and the size of the input pattern is the size of the drawing unit. And a pattern drawing unit for drawing the developed pattern if the number is a divisor.