JPH03194593A - Simultaneous display control system for index display and direct value display - Google Patents

Abstract

PURPOSE:To allow the flexible dealing with application by setting the display system of the index and direct value in the picture element unit of each of plural windows in the corresponding window region by a control plane and displaying the colors indicated by the values of the respective picture elements. CONSTITUTION:The application (Ap)A opens the window (WD) by the index assignment and sets the inside of the rectangular shape set in the corresponding region of the WDA on the control plane Cp4 at 1 in the picture element unit. The ApB opens the WDB by the direct value assignment and sets the inside of rectangular shape set in the corresponding region of the WDB on the Cp 4 at 0 in picture element unit. The display system is then set by priority order and the 1 on the Cp 4 denotes the index and the 0 denotes the direct value display. The index of the display color is set in the WDA and the direct values of RGB are set in the WDB at the time of plotting in the rectangular shapes of the WDA, B of a frame buffer FB 1. The Cp 4 is then scanned in synchronization with the FB 1 to control a switching circuit 5 under the control of a control section. The values read out of the LUT 2 are transmitted to a display 3 by the straight value if the picture element value is the 0 and by the picture element value from the FB 1 if the 1. The graphic are thus displayed. The flexible dealing with the Ap is executed in this way.

Description

[Detailed Description of the Invention] [Summary] Regarding the simultaneous display control method of index display and direct value display in a multi-window system that displays multiple windows, different display formats (index display/direct value display) are supported for each application. The purpose is to provide a multi-window system that can display figures with high precision and flexibly support each application. , a control plane is provided to set the display format of the direct value display, and when opening a window, the above display format for each window is set in the corresponding window area on the control probe, and when displaying, scans the frame buffer and In a display format in which the control plane is synchronously referred to on a pixel basis and the control plane instructs on a pixel basis,
It is configured to display the color indicated by the value of each pixel in the frame buffer.

[Industrial application field]

The present invention relates to a simultaneous display control method for index display and direct value display in a multi-window system that displays a plurality of windows.

With the recent spread of computer graphics (CG), processing has diversified in the field of computer graphics (CG), and the display format may differ depending on the application, for example, index display or direct value display. The number is increasing.

On the other hand, current graphics display devices can only support the display of either index or direct value, and systems that support multiple applications, such as a multi-window system that displays multiple windows, cannot , a display control method that can flexibly respond to each application is required.

[Prior art and problems to be solved by the invention] Fig. 3 is a diagram explaining a conventional display control method, in which (a) shows the case of index display, and (b) shows the case of direct value display. (
cl) and (c2) show configuration examples of current graphics display devices.

Most conventional graphics display devices display color indicators, as shown in Figure (a).

In this method, the colors red (R), green (G), and blue (B) set in lookup table (LOT) 2 are specified by using indexes (0 to 255) as addresses. , you can uniquely specify the desired color.

However, as is clear from figure (a), in this method,
Since it displays 256 colors simultaneously, it is not suitable for displaying highly accurate figures that are generally desired.
By setting look-up table (LUT) 2, there is an advantage that a color can be specified only by specifying an index.

On the other hand, as shown in figure (b), there is a display method using direct color values, which uses 256 colors for each of red (R), green (G), and blue (B), for a total of 16M Since it can display multiple colors at the same time, it is suitable for displaying highly accurate figures.

However, there is a problem in that it cannot necessarily be said that direct color value specification is generally desired. For example, in a multi-window system that displays multiple windows, the application opening one window may use only color indexes, while the other application may display using direct color values. In such cases, as shown in Figure (cl) (color index display) and Figure (c2) (color direct value display), current graphics display devices can only display either the index or the direct value. There was a problem in that it could not be controlled and the applications that could be supported were limited.

In view of the above-mentioned conventional drawbacks, the present invention provides a multi-window system that displays a plurality of windows, in which index display and direct value display are simultaneously displayed, and the display format (index display/direct value display) differs depending on the application. ), the aim is to provide a multi-window system that can display highly accurate figures and flexibly support each application.

[Means to solve the problem]

FIG. 1 is a diagram illustrating the present invention in detail.

The above problem is solved by a simultaneous display control system for index display and direct value display configured as follows.

In a multi-window system that displays a plurality of windows, a control plane 4 is provided to set the display format of index display and direct value display for each window pixel as a unit. At the time of opening, the display format for each window is set to the corresponding window on the control probe 4, and when displaying, the control plane 4 is referenced pixel by pixel in synchronization with the scanning of the frame buffer 1. , the control plane 4 is configured to display the color indicated by the value of each pixel in the frame buffer in a display format instructed pixel by pixel.

[Effect]

That is, according to the present invention, a graphics display device is provided with a control plane 4 as shown in FIG.

The control plane 4 corresponds to the screen size (in pixels) of the graphics display device, and when a window with an index is opened by a certain application, the opened window of the control plane 4 is For example, set °l゛ to the bit corresponding to■,
When a window with a direct value specification is opened by another application, the focus corresponding to the opened window on the control plane 4 is set to, for example, 0''.

During actual display, the graphics display device refers to the control plane 4 pixel by pixel, and for pixels designated with an index, a lookup table (LLIT) is created based on the designated index. ) and the red (R) indicated by the index output from the lookup table (LOT).

When the pixel is displayed with green (G) and blue (B) values, and the next pixel indicates direct value display, the frame buffer
Red (R), green (G), blue (B) read from 1
The function is to display the pixel using the value itself, that is, the direct value.

This makes it possible to display indicators and direct values at the same time, making it easier to support multi-window systems, and providing highly accurate display and flexible support for applications.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

The above-mentioned FIG. 1 is a diagram for explaining the present invention in detail, and FIG.
The figure shows an embodiment of the present invention, in which a control plane 4 is provided in a graphics display device, and a pixel-by-pixel display is set corresponding to each window set on the control plane 4. To carry out the present invention, there is provided a means for performing color display in accordance with the display format specified by the control table 4, pixel by pixel, based on the information (0/1) of the format (index designation or direct value designation). This is a necessary measure.

Note that the same reference numerals indicate the same objects throughout the figures.

Hereinafter, with reference to FIG. 1 and FIG. 2, the simultaneous display system of index display and direct value display of the present invention will be explained.

Even if the present invention is implemented, the operations of index display and direct value display will not change in particular, so they will be omitted, and here, based on the display format information in units of pixels specified by the control table 4, We will mainly explain the method of displaying indicators and direct values at the same time.

■ First, application A executed on the host opens window A by specifying an index.

■ The host sets a rectangle to the window A in the area corresponding to the opened window A on the control plane 4 of the present invention provided in the graphics display device, and prints " inside the rectangle pixel by pixel. Add a cent to 1.

■ Next, assume that application B executed on the host opens window B with direct value specification.

■ The host sets the rectangle of the window B in the area corresponding to the opened window B on the control plane 4 of the present invention provided in the graphics display device, and prints " inside the rectangle pixel by pixel. Set it to O゛.

At this time, according to the display priority order, the setting of the display format with a higher priority order is given priority.

Here, °1" on the control plane 4 indicates an index display, and O" indicates a direct value display.

■ At the timing of the drawing operation, the host draws the rectangles of windows A and B in frame buffer 1 in the graphics display device according to the display priority (specifically, the If this is detected, the area of the window excluding the overlapping portion is divided into a plurality of rectangles and drawn).

■ When the host performs the above drawing in frame buffer 1 in the graphics display device, it sets the display color for window A using an index, and sets the display color for window B to red (R). , green (G), blue (B)
Set the immediate value of

(2) When drawing is performed, under the control of the control unit 6, the graphics display device scans the control plane 4 set by the host in synchronization with the scan of the frame buffer 1, and calculates the value of the corresponding pixel. If it is 0", it is recognized as a direct value display, and the switching circuit 5 is controlled to display the red (R), green (G),
Send the direct value of blue (B) to its side, display 3,
If the value of the corresponding pixel is °1, it is recognized as an index display, and the look amplifier table (LOT) 2 is accessed using the pixel value read from the frame buffer 1 as an address, and the switching circuit 5 is similarly controlled. The values of red (R), green (G), and blue (B) corresponding to the indexes read from the look-up table (LOT) 2 are sent to the display 3.

■ On Display 3, the sent red (
The values of R), green (G), and blue (B) are converted into analog signals, and the graphics specified by each application are displayed in color on the screen in the specified colors in different display formats for each pixel.

As described above, the present invention provides a control plane in a graphics display device and makes settings in the control plane to perform simultaneous display control of index display and direct value display in a multi-window system that displays a plurality of windows. Information (0/
Based on 1), the present invention is characterized in that the image drawn in the frame buffer is displayed in color on a pixel-by-pixel basis according to the display format specified by the control table.

〔Effect of the invention〕

As explained above in detail, the simultaneous display control method of index display and direct value display of the present invention is applicable to a multi-window system that displays a plurality of windows, in which the pixels of each window are As a unit, a control plane is provided to set the display format of index display and direct value display, and when opening a window, the above display format for each window is set in the corresponding window area on the control probe, and when displaying, , The control plane is referenced pixel by pixel in synchronization with the scanning of the frame buffer, and the color indicated by the value of each pixel in the frame buffer is displayed in the display format instructed by the control plane pixel by pixel. This makes it possible to display indicators and direct values simultaneously, making it easy to support multi-window systems and providing highly accurate display.

This has the effect of making it possible to respond flexibly to applications.

2 is a lookup table (LOT).

3 is the display, 4 is the control brain.

5 is a switching circuit, and 6 is a control section.

are shown respectively.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the present invention in detail. FIG. 2 is a diagram showing an embodiment of the present invention. FIG. 3 is a diagram explaining a conventional display control method. It is. In the drawing, 1 is the frame buffer. Control button A showing a practical example of the present invention Figure 2 No. figure (Part 2)

Claims (1)

[Claims] In a multi-window system that displays a plurality of windows, there is provided a control plane (for setting display formats of index display and direct value display for each of the plurality of windows in units of pixels of each window). 4), and when opening a window, the display format for each window is set using the control probe (4).
), and when displaying, the control plane (4) is referenced pixel by pixel in synchronization with the scanning of the frame buffer (1), and the control plane (4) gives instructions pixel by pixel. A simultaneous display control method for index display and direct value display, characterized in that the color indicated by the value of each pixel of a frame buffer is displayed in a display format.