JPH03196096A - Display control device - Google Patents

Abstract

PURPOSE:To eliminate the waiting time of a processor section and to shorten the overall time for plotting by providing a saving means which saves the initial set value and start signal necessary for formation of image information during the operation of an image information forming means and means for inputting the initial set value and start signal to the image information forming means right after the end of the formation of the image information. CONSTITUTION:The processor section 1 outputs the start signal S1 to a start signal saving circuit 7. The start signal saving circuit 7 saves the start signal S1 from the processor section 1 therein when a straight line generating circuit 2 is under plotting by referring to an under-plotting signal S2 when the start signal S1 from the processor section 1 is inputted to the saving circuit. A set prohibition signal S3 is simultaneously outputted to the processor section 1. The processor section 1 is so formed as not to change the content of the saving register 8 while this set prohibition signal S3 is outputted. The processor section 1 is no longer necessitated to wait until the image information forming means ends the plotting and since the continuous operation of the image information forming means is possible in this way, the image information is formed at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a display control device. The present invention relates to a display control device for displaying images on a computer.

(Prior art) A block diagram of a conventional display control device of this type is shown in the third section.
In the figure, 1 is a processor section, 2 is a linear generation circuit as an image information generating means, 3 is an initial setting register, and 4 is an image memory in which image information is stored.

When this display control device draws a straight line on the image memory 4, the following procedure is used.

(2) The processor unit 1 calculates initial setting values (starting point address, initial constant, subtraction constant, addition constant, number of straight line pixels, drawing direction) necessary for the straight line generation circuit 2 to generate a straight line.

(2) When the processor section 1 detects from the drawing raw signal S2 that the straight line generation circuit 2 is not drawing, it sets the above-mentioned initial setting value in the initial setting register 3.

(2) The processor section 1 outputs the activation signal S1 to activate the straight line generation circuit 2.

(2) The straight line generation circuit 2 generates a straight line and draws (stores) the straight line in the image memory 4 as image information.

(Problem to be Solved by the Invention) In the conventional technology described above, when drawing straight lines continuously, even if the processor unit 1 has finished calculating the initial setting value of the next straight line, the straight line generation circuit 2 finishes drawing. If it is recognized by the drawing-in-progress signal S2 that the line has not been drawn, it is not possible to set the initial setting value of the next straight line in the initial setting register 3 or to start the straight line generation circuit 2.

For this reason, the processor section 1 is forced to wait until the straight line generation circuit 2 finishes drawing, which causes a problem in that the drawing of the straight line is delayed accordingly.

That is, FIG. 4 shows the operation of the processor section 1 and the linear generation circuit 2 over time. In the figure, in the operation of the processor section 1, a indicates the calculation process of the initial setting value, b indicates the setting process of the initial setting value to the initial setting register 3, and C indicates the starting process of the straight line generation circuit 2.

As is clear from the figure, even if the processor unit 1 finishes the initial setting value calculation process a, if the straight line generation circuit 2 has not finished drawing, the initial setting value setting process and subsequent processes will finish drawing. It can be seen that the user has to wait for a time t.

The present invention was proposed in order to solve the above problems, and its purpose is to enable the processing of the processor section without being affected by the state of the image information generation means such as the linear generation circuit. An object of the present invention is to provide a display control device that speeds up drawing processing.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a conventional display control device with an image information generating means such as a straight line generation circuit that performs initial settings necessary for generating one image information during drawing. saving means for temporarily saving the value and the start signal; and means for inputting the saved initial setting value and the start signal to the image information generating means immediately after the image information generating means finishes drawing. This is the addition of

(Function) According to the present invention, even when the image information generation means is drawing, the processor section saves the already calculated initial setting values and the activation signal to the saving means, thereby calculating the next initial setting value, etc. Therefore, the waiting time of the processor section can be eliminated, and the overall drawing time can also be shortened.

(Example) The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of this embodiment.

In this figure, the same components as in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted, and the following description will focus on the different parts. That is, in this example.

a save register 8 for temporarily saving initial setting values between the processor section 1 and the initial setting register 3;

A starting signal saving circuit 7 for temporarily saving the starting signal S1 sent from the processor section 1 to the straight line generation circuit 2 as image information generating means is added, and these saving registers 8 and starting signal saving circuit 7 constitutes the evacuation means in the present invention.

The operation of this embodiment will be explained below.

(2) The processor section 1 calculates the initial setting values necessary for the straight line generating circuit 2 to generate a straight line.

(2) The processor unit 1 sets the above-mentioned initial setting value in the save register 8 if the setting prohibition signal S from the activation signal save circuit 7 is not output. Here, the setting prohibition signal S3
is for prohibiting the processor section 1 from changing the contents of the save register 8.

(2) The processor section 1 outputs the activation signal S1 to the activation signal save circuit 7.

When the activation signal S1 from the processor section 1 is input, the activation signal saving circuit 7 refers to the drawing signal S2 and, if the straight line generation circuit 2 is drawing, internally outputs the activation signal from the processor section 1. Evacuate S1.

At the same time, a setting prohibition signal S3 is sent to the processor unit 1.
Output. The processor section 1 receives this setting prohibition signal S,
The contents of the save register 8 are not changed while the is being output. Then, when the straight line generation circuit 2 finishes drawing, the initial setting capture signal S4 is sent to the initial setting register 3.
and save register 8 to initial setting register 3.
Import the contents of , that is, the initial setting values. At the same time, the starting signal saving circuit 7 outputs the saving starting signal 81' to start the linear generation circuit 2 and cancels the setting prohibition signal S3.

Note that if the straight line generating circuit 2 is not drawing when the starting signal S1 from the processor section 1 is input, the starting signal saving circuit 7 immediately outputs the initial setting capture signal S4 and the starting signals S, /. Activate the straight line generation circuit 2.

(2) When drawing straight lines continuously, the processor unit 1 repeatedly performs the processes (1) to (4) above.

Processor section 1 and straight line generation circuit 1 during straight line drawing described above
The operation of llI2 is shown in FIG. Processor section 1 in the same figure
In the operation, as in FIG. 4, a is the initial setting value calculation process, C is the startup process of the linear generation circuit 2, and b'
is an initial value saving process to the save register 8.

In FIG. 2, when the processor section 1 finishes calculating the initial setting value at time t, the straight line generating circuit 2 is drawing, but the processor section 1 is under the condition that the setting prohibition signal S3 does not exist. The processor section 1 immediately performs the saving process b' to the saving register 8 and the saving process of the starting signal s1 to the starting signal saving circuit 7 as part of the starting process C of the linear generation circuit 2. Processing a, b'
Repeat C.

When one drawing is completed at time t2, the drawing signal st is canceled at this point, so the starting signal saving circuit 7 immediately outputs the initial setting capture signal S4 and the starting signal 8.
1' and restart the straight line generating circuit 2. As a result, straight lines as image information for which the initial value setting process a has been completed at time t1 are continuously drawn by the straight line generating circuit 2.

Therefore, according to this embodiment, there is no waiting time that conventionally existed in the operation of the processor section 1, and the straight line generation circuit 2 can also perform drawing operations continuously without any waiting time.

Although the above embodiment describes the case where the present invention is applied to a straight line drawing device, the present invention can be applied to a display control device for displaying image information such as not only straight lines but also various figures and characters. .

(Effects of the Invention) As described above, according to the present invention, even when the image information generation means is generating image information, the processor section saves initial setting values and activation signals necessary for generation of the next image information. It is possible to set it in the means, save it, and move on to the next process.

Therefore, the processor section does not need to wait until the image information generation means finishes drawing, and since the image information generation means can operate continuously, there are advantages such as being able to generate image information at high speed.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a straight line drawing device as an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the operation of the processor section and the straight line generation circuit, and FIG. 3 is a straight line drawing for explaining the conventional technique. FIG. 4, a block diagram of the apparatus, is an explanatory diagram showing the operation of the processor section and the linear generation circuit in FIG. 3. 1... Processor section 3... Initial setting register 7... Start signal save circuit 2... Straight line generation circuit 4... Image memory 8... Save register

Claims (1)

[Claims] Image information generation means for generating image information to be displayed;
In a display control device equipped with an image memory in which image information generated by this image information generation means is stored, during the operation of the image information generation means, initialization necessary for generation of image information in this image information generation means is performed. Saving means for saving a set value and a start signal for starting the image information generating means; and the initial setting value saved in the saving means immediately after the image information generating means finishes generating the image information. and means for inputting an activation signal to the image information generating means.