JPH0588658A - Display controller - Google Patents

Abstract

PURPOSE:To cope with plural drawing processes at a time by a graphic display device which has a raster operation function. CONSTITUTION:This display controller has a frame memory part 101 stored with plotting data to be platted, a platting request part 102 which outputs the address and plotting data of the frame memory part 101 and the kind of raster operation at the time of the plotting so as to perform the plotting, plotting process parts 105 and 106 which have raster operation storage parts 103 and 104 stored with the kind of the raster operation outputted from the plotting request part 102 and have plural process main bodies for plotting on the frame memory part 101 while processing the raster operation stored in the raster operation storage parts for the plotting data outputted from the plotting request part 102 when inputting a process start signal, an address decoding part 107 which decodes the address outputted from the plotting request part 102 and outputs a process actuation signal for requesting the start of a drawing process to one process main body of the plotting process parts 105 and 106, and a display part 108 which reads the plotting data stored in the frame memory part 101 and displays it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-window display device in a computer system.

[0002]

2. Description of the Related Art With the recent widespread use of bitmap displays and pointing devices, computer systems having a multi-window function in which the only display in the system is divided into a plurality of areas called windows and each window is regarded as one virtual terminal have become available. Widely used.

FIG. 4 is a block diagram of a conventional display control device. In the figure, 201 is a frame memory unit that stores drawing data to be drawn. Reference numeral 202 denotes a drawing request unit, which makes a drawing request by outputting the address of the frame memory unit 201, drawing data, and the type of raster operation at the time of drawing in accordance with an operator's operation or a command described in the application program. Is. A raster operation storage unit 203 stores the type of raster operation output from the drawing request unit 202. Reference numeral 204 denotes a drawing processing unit, which has a raster operation storage unit 203, and for the drawing data output from the drawing request unit 202 when a processing start signal is input, the raster stored in the raster operation storage unit 203. The image is drawn in the frame memory unit 201 while performing an operation operation. 205 is an address code part,
The address output from the drawing request unit 202 is decoded and a processing start signal is output to the drawing processing unit 202. A display unit 206 reads out and displays the drawing data stored in the frame memory unit 201. Actually, various other constituent elements such as a function for generating a window are required in addition to this, but they are omitted because they are not the main purpose of the present invention.

The operation of the conventional display control device configured as described above will be described below. (1) The operator performs an operation for drawing.
Alternatively, the application program executes the command described therein for performing drawing. (2) On the other hand, the drawing request unit 202 outputs the type of raster operation at the time of drawing, and outputs the address and drawing data in the frame memory unit 201 to request drawing. (3) The raster operation storage unit 203 holds the type of raster operation at the time of drawing output from the drawing request unit 202. (4) The address decoding unit 205 decodes the address output from the drawing request unit 202, and outputs the processing start signal to the drawing processing unit 204 if the address is in the frame memory unit 201. (5) In the drawing processing unit 204, the drawing data output from the drawing requesting unit 202 when the processing start signal is input,
Drawing is performed at the address designated by the drawing requesting unit 202 while performing the raster operation operation stored in the raster operation storage unit. (6) The frame memory unit 201 holds the drawing data drawn by the drawing processing unit 204. (7) In the display unit 206, the drawing data stored in the frame memory unit 201 is read out to display it. (end)

[0005]

In the conventional display control device, as shown in the above-described specific example, the type of raster operation is stored in the raster operation storage unit, and thereafter the drawing data and the drawing data are stored. The drawing process is started by outputting the address in the frame memory unit for drawing. However, in such a configuration,
When the drawing process for a certain drawing request is being performed, the drawing process for the different drawing request may be activated by the task switch, so the specification of the raster operation set in the different drawing process is used. There is a problem that unintended drawing data can be obtained.

In view of the above problems of the conventional display control apparatus, the present invention makes it possible to specify a raster operation specified in each drawing request even when a plurality of drawing requests occur simultaneously. It is an object of the present invention to provide a display control device capable of performing drawing processing by using.

[0007]

The present invention outputs a frame memory unit for storing drawing data to be drawn, an address of the frame memory unit for drawing, drawing data, and a type of raster operation at the time of drawing. And a raster operation storage unit that stores the type of raster operation that is the output of the rendering request unit. When a processing start signal is input, the rendering data output from the rendering request unit A rendering processing unit having a plurality of processing subjects for rendering in the frame memory unit while performing a raster operation operation stored in a raster operation storage unit, and the rendering processing unit by decoding an address output from the rendering request unit. Address for outputting the processing start signal requesting the start of the drawing processing to one processing subject of A decoding unit, a display control device having a display unit for displaying read the drawing data stored in the frame memory unit.

[0008]

The display control device of the present invention has the above-mentioned configuration.
When the drawing request unit outputs a drawing request by outputting the address of the frame memory unit, drawing data, and the type of raster operation at the time of drawing, the address decoding unit processes the drawing request in consideration of the address of the frame memory unit. A processing start signal is output to the drawing processing unit having the processing main body to be processed, and the drawing operation unit that has received the processing start signal inputs the processing start signal to the raster operation storage unit for the drawing data output from the drawing request unit. Rendering is performed in the frame memory unit while performing the stored raster operation operation, and the rendering data stored in the frame memory unit is read and displayed on the display unit.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the display control device of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram of a display control device in an embodiment of the present invention. In the figure, 101 is a frame memory unit which stores drawing data to be drawn. Reference numeral 102 denotes a drawing request unit, which makes a drawing request by outputting the address of the frame memory unit 101, drawing data, and the type of raster operation at the time of drawing in accordance with an operator's operation or a command described in an application program. Is. A first raster operation storage unit 103 stores the type of raster operation output from the drawing request unit 102. 104 is the second
The raster operation storage unit stores the type of raster operation output from the drawing request unit 102. Ten
Reference numeral 5 denotes a first rendering processing unit, which has a first raster operation storage unit 103 and stores in the raster operation storage unit 103 the rendering data output from the rendering request unit 102 when a processing start signal is input. Drawing is performed in the frame memory unit 101 while performing the raster operation that is performed. 106 is a second drawing processing unit,
The raster operation storage unit 104 is provided, and the frame memory unit performs the raster operation operation stored in the raster operation storage unit 104 with respect to the drawing data output from the drawing request unit 102 when a processing start signal is input. It is to be drawn on 101. An address decoding unit 107 decodes the address output from the drawing request unit 102 and outputs a process activation signal to either the drawing processing unit 105 or the second drawing processing unit 106. A display unit 108 reads out and displays the drawing data stored in the frame memory unit 101.

The drawing processing unit described in the claims is the first
The drawing processing unit 105 and the second drawing processing unit 106 are indicated. Actually, various components other than the above are required to realize the function of generating a window, but this is not the main point of the present invention, and therefore the description thereof is omitted.

The operation of the conventional display control device configured as described above will be specifically described below. In the above-described configuration, for example, as shown in FIG. 2, the frame memory unit 101 having a resolution of 1000 × 1000 generates two drawing requests for the first drawing data and the second drawing data, and the drawing is performed. Consider when it will take place. (1) The operator performs an operation for drawing. Alternatively, the application program executes the command described therein for performing drawing. (2) On the other hand, the drawing request unit 102 stores the type of raster operation in the first raster operation storage unit 103 in order to issue the first drawing request. Here, the exclusive OR is designated. In addition, the drawing request unit 102
Stores the type of raster operation in the second raster operation storage unit 104 in order to issue the second drawing request. Here, the logical product is specified. Next, the drawing request unit 102 receives the first drawing data, which is rectangular data, and the first drawing data.
The two-dimensional address (100,400) at the upper left corner in the frame memory unit 101 of the drawing data is output. Also, the drawing request unit 1
02 outputs the second drawing data which is rectangular data and the two-dimensional address (700, 100) at the upper left end in the frame memory unit 101 of the second drawing data. (3) The address decoding unit 107 detects the address output by the drawing request unit 102, and the Y coordinate value of the address is detected.
If it is less than 500, a processing activation signal is output to the first drawing processing unit 105, and if it is 500 or more, a processing activation signal is output to the first drawing processing unit 106. Therefore, in the case of the first drawing request, the processing start signal is output to the first drawing processing unit 105, and in the case of the second drawing request, the processing start signal is output to the second drawing processing unit 106. (4) In the first drawing processing unit 105, the address decoding unit 107
When a process activation signal is input from the first rendering operation unit between the first rendering data input from the rendering request unit 102 and the image data of the area in the frame memory unit 101 where the first rendering data is rendered. Drawing is performed in the frame memory unit 101 while performing exclusive OR which is the type of raster operation stored in 103. (5) In the second drawing processing unit 106, the address decoding unit 107
A process activation signal is input from the second raster operation storage unit between the second drawing data input from the drawing request unit 102 and the image data of the area in the frame memory unit 101 where the second drawing data is drawn. Drawing is performed in the frame memory unit 101 while performing a logical product that is the type of raster operation stored in 104. (6) The display unit 108 periodically reads the drawing data stored in the frame memory unit 101 and displays it on a display device such as a CRT as shown in FIG. (end)

[0013]

Since the display control device of the present invention has a plurality of drawing processing units and a raster operation storage unit associated therewith, another drawing request is issued before one drawing request is completed. Even in such a situation, since it is possible to perform drawing while accurately performing the raster operation operation for the drawing request, the practical effect is great.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a display control device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a drawing request input to the display control device according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a display result of a display control device according to an embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional display control device.

[Explanation of symbols]

 101 frame memory unit 102 drawing request unit 103 first raster operation storage unit 104 second raster operation storage unit 105 first drawing processing unit 106 second drawing processing unit 107 address decoding unit 108 display unit

Claims (1)

[Claims] 1. A frame memory unit for storing drawing data to be drawn, a drawing request unit for outputting an address of the frame memory unit for drawing, drawing data and a type of raster operation at the time of drawing, and the drawing. A raster operation storage unit that stores the type of raster operation that is the output of the request unit is provided, and when a processing start signal is input, the drawing data that is the output of the drawing request unit is stored in the raster operation storage unit. A rendering processing unit having a plurality of processing subjects for rendering in the frame memory unit while performing a raster operation operation, and an address which is an output of the rendering request unit to decode one processing subject of the rendering processing unit. An address decoding unit that outputs the processing activation signal requesting the start of drawing processing; A display control device having a display unit for reading and displaying drawing data stored in a memory unit.