JPS63188191A - Multiple color pallet control circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Field of Industrial Application) The present invention relates to a multiple color palette control circuit suitable for use in a workstation silane.

(Prior art) In recent years, with the advancement of man-machine interfaces, more and more sophisticated functions have been required for the CRT 7' provided by Works Steel.
) Typical examples are color displays including armlets and multi-window displays.

FIG. 3 shows an example of the configuration of a color graphics interface circuit included in a conventional workstation, and FIG. 4 shows a conceptual diagram of its operation. In the figure, 3I is a CPU, 32 is a bitmap memory, 33 is a palette memory, 34 is a window control circuit, 35 is an armlet control circuit, and 6 is a CRT monitor. Further, 311 is a CPU path, 312 is background data, 313 is window φ1 data, 314
3 is a data line through which window 2 data is propagated, 315 is synthesized data, 316 is /9let data, and 317 is converted data, respectively.

The CPU 3J assumes three bitmap data on the bitmap memory 32, that is, a background window Φ1 and a window Φ2, and performs graphic drawing. The window control circuit 34 has information such as the display position, size, priority, and start address of the bitmap memory 32 of the two windows in advance, and creates a composite screen based on this information. /4' Left control circuit 35 maps n-bit information representing each pixel of the composite screen to m-bit information. The mapping method is stored in advance in the /4'let memory 33. - As an example, n = 4 # m =
In the case of 12, any 16 colors out of 4096 colors can be displayed simultaneously. The final output is the transformed screen after mapping.

(Problems to be Solved by the Invention) By the way, in the conventional method described above, since conversion is performed after composition, it is not possible to specify glossettes for each window. This causes inconvenience in multitasking systems. In other words, in the case of multitasking, a lead window is assigned to each task, and if you change the palette in one task, the palette for the entire screen will change, and the display colors in the windows of other tasks will also change. The present invention has been made in view of the above circumstances.

It is possible to specify a palette for each window.

Accordingly, it is an object of the present invention to provide a multiple color palette control circuit that eliminates inter-task interference due to /4 left change in a multi-task system.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a multiple color palette control circuit that allows palette specification for each window. The present invention is constructed of a bitmap memory and a window control circuit that obtains n-bit information read from the bitmap memory and maps it to m-bit information according to the contents of color rafts set independently.

(Operation) In the above configuration, the CPU draws graphics for each window on the bitmap memory.

Each bitmap data is independently designated, and n-bit information indicating each pixel is mapped to m-bit information according to the contents of the 9-letter memory, resulting in a converted screen. This conversion is accomplished by a window control circuit.

This allows motherlets to be specified independently for each window, and interference between tasks due to changes in motherlets in multitasking operations can be eliminated.

(Example) Hereinafter, an example of the present invention will be described in detail using the drawings. Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing an embodiment of the present invention;
The figure shows the concept of its operation.

In the figure, 1 is a CPU, which accesses a bitmap memory 12 and palette memories 13 to J5, which will be described later. 12 is a bitmap memory in which each window data is stored. 13 is the glossary memory that specifies the no-left conversion of the background screen ◆0.14 is the window φ
Specify the armlet transformation of 1/mothert memorina f,
Reference numeral 15 is a palette memory divided by 2 for specifying the window 20/9 let conversion, and the let conversion is independently specified for each window. 16 is a palette control circuit that performs left conversion of the background screen Φ0.17 is a palette control circuit that performs window left conversion of window 1 +1.18 is a palette control circuit that performs window left conversion ÷2, and elbow left conversion is performed for each window. 19 synthesizes the converted data, that is, the J? This is a window control circuit that combines the converted screens after the let conversion into one screen. 20 is CR
T monitor 111 is a CPU path.゛Incidentally, 112 is background data, 113 is window data 1, 114 is window φ2 data, j15td;, example is φ0 data, and 116 is palette ÷ 1 data 1.
11'l is /9let◆data, 11g is the converted background data, 119 is the converted Windtana 1 data,
120 is a converted window φ22-data, and 121 is a data line through which the combined data is propagated.

Hereinafter, the operation of the embodiment of the present invention will be explained in detail. C.P.
UJJ assumes three bitmaps, ie, background, windower 1, and windower 2, on the bitmap memory 12 and performs graphic drawing. Each bitmap data is stored in an independently designated palette memory 13.1.
According to the contents of 4.15, n-bit information representing each pixel is mapped to m-bit information, resulting in a converted screen. - For example, if n=4゜m=12, the background window Φ1,
Any 16 colors out of 4096 colors can be displayed simultaneously in each window. This conversion is performed by a window control circuit 19 prepared separately for background window +1 and window ÷2. The window control circuit 19 is
Information such as the display position, size, priority, and bitmap start address of the two windows is stored in advance, and a composite screen is created based on that information. The final output is this composite image.

In the embodiment of the present invention, only the case where the number of hardware windows is 2 is illustrated, but the number of hardware windows is
It can be extended to the case of In that case, including the background, N+1 motherlet memories and N+1 motherlet control circuits,
A window control circuit is required to combine N+1 pieces of data. It can also be applied to other display devices such as a KLCD plasma display instead of a CRT. Also,
As for the background, a system that does not perform palette conversion may also be considered.

[Effects of the Invention] According to the present invention as described above, a palette can be specified independently for each window. Therefore, in multitasking operations. 4. Interference between tasks due to Russoto changes can be eliminated.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an embodiment of the present invention, Figure 2 is a conceptual diagram of its operation, Figure 3 is a block diagram of a conventional example, and Figure 4 is a conceptual diagram of its operation. It is. 11...CPU, 72...Bitmap memory, 1
3゜14.15...)! Let memory, 16.17.
18... Riyalet control circuit, 19... Window control circuit. Applicant's agent Patent attorney Takeshi Suzue Onyo 1WJ Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] Obtain a bitmap memory in which n pieces of window data are each stored, and obtain n bits of information read from this bitmap memory, and map them to m bits of information according to the contents of the color palette set independently. 1. A multiple color palette control circuit comprising: a window control circuit for controlling a window;