JPH02236618A - Picture display control system - Google Patents

Abstract

PURPOSE:To display original colors for all windows by providing a window managing table, a window ID line buffer, a computing element, and a chrominance signal generator, and always generating a chrominance signal by using a LUT(window LUT) proper to the window. CONSTITUTION:The window managing table 104 controls the window ID and the coordinate value of each window, and the window ID line buffer 106 stores a window ID by the share of one time of scan, and the computing element 105 stores the window ID of each picture element in the window ID line buffer 106 at every scan based on the window managing table 104. And the chrominance signal generator 107 is provided with the LUT(color conversion table) 404 consisting of plural window LUTs, and generates the chrominance signal based on the window ID stored in the window ID line buffer 106 by the computing element 105 and a color code in a frame buffer 103, and outputs it to a display device 108. Thereby, all the windows can be displayed in the original colors.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a screen display control method, and particularly to a color map type control method (LUT (Look UpTabl)
6. Color conversion table. This invention relates to a screen display control method in an information processing system that displays a plurality of windows directly on a display device using the ITJ method (which has a table showing the correspondence between color codes and brightness values). [Prior art] Conventionally, in this type of screen display control method, 8 pixels per pixel
Based on the color code (color identification number) stored in a frame buffer with a depth (information amount) of ~12 bits, red (Red) and green (G) are determined by the LUT in the color signal output section.
A color signal having luminance values of each color (reen) and blue was generated, and the contents of the frame banner were displayed on the screen of the display device using the color signal. Here, only one LUT was used for outputting the color signal by the color signal output section. Therefore, even if each window has a unique LUT in an information processing system that can display multiple windows on the screen, only the LUT of one window specified by the cursor etc. is used in the actual display (this Therefore, when the contents of the LUT are different for each window and the specified window changes due to movement of the cursor, etc., the contents of the LUT used for outputting the color signal by the color signal output section will change accordingly. ). [Problems to be Solved by the Invention] In the conventional screen display control method described above, only the LUT of one window specified by the cursor etc. is used for outputting color signals by the color signal output section. This has the disadvantage that windows other than the one specified by will be displayed in a color different from their original color (color based on the contents of the specified LUT). In view of the above-mentioned points, an object of the present invention is to have a color signal output section (color signal generator) that can use a LUT unique to each window when outputting a color signal. To provide a screen display control method capable of displaying original colors for all windows while correctly reflecting the contents.

[Means to solve the problem]

The screen display control method of the present invention is used in an information processing system that displays a plurality of windows on a display device using a color map type control method. A window ID line buffer that stores the ID for one scan, and a window ID line buffer for each pixel based on the window management table for each scan.
an arithmetic unit that stores D in the window ID line buffer, and an LUT consisting of a plurality of window LUTs, based on the window ID stored in the window ID line buffer by the arithmetic unit and the color code in the frame buffer. and a color signal generator that generates a color signal and outputs it to a display device.

[Effect]

In the west side display control method of the present invention, the window management table is the window of each window! D and coordinate values, etc. are managed, and the window 10 line buffer is the window! D
is stored for one scan, and the arithmetic unit stores the window 10 of each pixel based on the window management table for each scan.
The color signal generator has an LUT consisting of a plurality of window LITs, and the color signal generator generates a color based on the window ID stored in the window ID line buffer and the color code in the frame buffer. Generates a signal and outputs it to a display device. [Example] Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the screen display control method of the present invention. The screen display control method of this embodiment manages the state of each window, the user interface, etc., and writes the contents of the window management table 104 and the LUT 404 (see FIG. 4) in the color signal generator 107 as necessary. Change CPU (Central
Processing Unit) 101 and CPU
The main memory l02 (which stores the IOI processing program)
(not mentioned in the following description) and a frame buffer 10 which is a storage area that stores display contents (color code of each pixel, etc.) of the screen on the display device 10B.
3 and the window ID (which is the identification information of each window)
IDentification) and the coordinate values of the end points of each window (the maximum and minimum values of the X and Y coordinates for each window), etc., and the window management table 104.
The window ID (hereinafter referred to as the window ID of each pixel) of the window to which each pixel belongs (the window in which each pixel is displayed) is determined from the contents of Each pixel (corresponding to one pixel) in the screen area (l line) displayed in one scan (window ID line bus sofa 10
Window ID line buffer l06 (corresponding to the element in window ID) that stores the window ID of
(The contents of the line buffer 106 are determined before scanning in the actual screen display) and the window LUT related to the window ID of the pixel to be displayed on the screen based on the contents of the frame buffer 103 and the contents of the window ID line buffer 106. A color signal generator 107 generates a color signal by referring to the LUT (LUT specific to each window configuring the LUT 404), and a color signal generator 107 that can display multiple windows based on the color signal generated by the color signal generator 107. It is configured to include a display device 108 that displays a screen.

FIG. 2 is a diagram showing an example of a screen displayed on the display device 108. This screen includes window a
, and window b, which is located further back than window a, are displayed.

FIG. 3 is a diagram showing the contents of the window management table 104 corresponding to the screen shown in FIG. Referring to this figure, each row of the window management table 104 (item i
(row identified by i=1.2,...,n (positive integer)) is the window ro(w(1
)) and the coordinate values of the end points (Xmin(i), Xmax (+
), Ymin (1) and Ymax(i)), it also reflects the state of window overlap. That is, in the case of overlapping windows, the rows related to windows located further back are located in the front rows (rows with smaller l in FIG. 3). Therefore, when a change occurs in the overlap of windows, the rows of the window management table 104 are rearranged accordingly.
This is done by IoT.

Furthermore, when a window is moved, the corresponding coordinate values in the window management table 104 are changed by the CPU 101, so that the contents of the window management table 104 are always set to reflect the screen displayed on the display device 108. ing.

Note that the blank area (blank line) of the window management table 104 is always cleared to 0 by the CPUIOI (the value of the window 10 is set to 0). FIG. 4 is a block diagram showing the configuration of the color signal generator 107. Referring to this figure, the color signal generator 107 is
A register A40 that inputs and stores the window ID of the pixel to be displayed from the window ID line buffer 106.
1, a register B402 that inputs and stores the color code of the pixel to be displayed from the frame buffer 103, and an address of the LUT 404 (window LU
LUT reference address generator 403 that generates an address (consisting of information specifying T and an address within its window LUT)
and a LUT consisting of multiple window LUTs.
404 (If the depth (color code information) of each pixel of the frame bath sofa 103 is n bits and the maximum number of windows that can be displayed on the screen is W, the maximum is 2" x W
) and the red. RGB register group 405 stores green and blue brightness values (R register stores red brightness value, G register stores green brightness value, B register stores blue brightness value) It consists of the following: Referring to FIG. 5, the processing of the arithmetic unit 105 includes an initialization step 51 and a window management table reference step 5.
2, a window ID determination step 53, a window range determination step 54, a window ID substitute step 55, a pointer end determination step 56, and a pointer increment step 57. Next, the operation of the screen display control method of this embodiment configured as described above will be explained.

When the contents of the frame buffer sofa 103 are displayed on the screen of the display device 108, the arithmetic unit 105 performs the following processing to generate a window ID (see FIG. 5). Note that this process is a process of storing the window ID of each pixel in the screen area (L line) displayed in one scan in the window ID line buffer 106. Therefore, the window ID line buffer 106, which is an area for one line, is sufficient as the area for storing the window ID.

First, in order to refer to the information related to the window displayed at the bottom of the screen, move the pointer (information indicating the item i that identifies the row) of the window management table 104 to the first row (i=
1) Return to pointer (initialize the pointer)
, all elements of the window ID line buffer 106 are initialized (step 51).

Next, the contents of the row indicated by the pointer in the window management table 104 are referred to (step 52).

Whether information exists in the row (reference position) referenced in step 52 in the window management table 104 (whether the window ID is 0 or not). The blank area (blank line) in the window management table 104 is always cleared to 0. ', so if the window ID is 0, it is assumed that there is no information in that row) (step 53).
．． If the window ID is not 0 in this judgment, the scanning line currently being processed (the line being scanned)
is within the range of the window identified by the window ID in the information of the row in the window management table 104 that is currently being referenced. (step 54). Note that in the determination at step 54, overlapping windows are ignored, and even if the window in question is hidden behind another window on the screen, if the scanning line in question exists in the coordinate range within the above-mentioned range, then
It is determined that the scan line is within the range of the window. If the scanning line is within the range of the window in step 54, the window ID line buffer 1 corresponds to the range overlapping the window on the scanning line.
The window ■D is assigned to the element of 06 (step 55). If the window ID is 0 in the determination at step 53,
If it is determined in step 54 that the scanning line is not within the range of the window, or if the process in step 55 is completed, it is determined whether the pointer points to the last part (l=n) (step 56). If the pointer does not point to the last point in this judgment, the pointer is incremented (increase l).
Step 57), the processing and determination of steps 52 to 56 are repeated.

If it is determined in step 56 that the pointer points to the last part, the process ends. Here, since the above-mentioned processing and judgment are performed in order from the window existing at the back of the screen, the state of window overlap is determined by the window ID line bar sofa 10.
This can be reflected in the contents of 6.

The color signal generator 107 is connected to the arithmetic unit 105 as described above.
The content (window ID) stored in each element of the window ID line buffer 106 and each pixel of the frame buffer 103 (window ID line buffer 10
The contents (color code) of the pixel corresponding to element 6 are input into register A 401 and register B 402. LUT reference address generator 40 in color signal generator 107
3 combines the window 10 in register A 401 and the color code in register B 402, and combines the address of LUT 404 to be referenced for each pixel (information indicating a specific window LUT in LUT 404 and the above-mentioned information in that window LUT). Address of entry related to color code)
Generate. The color signal generator 107 refers to the corresponding entry in the LUT 404 based on the generated address and generates red. The green and blue luminance values are extracted, and a color signal consisting of these luminance values is generated via the RGB register group 405 and output to the display device 108.

This allows the original colors of all windows to be displayed on the screen on the display device 108. The above-described processing is repeated for each scan, and a predetermined display is performed on the screen of the display device 10B. [Effects of the Invention] As explained above, the present invention provides a window management table, a window ID line bar 2 file 1 in an information processing system that displays a plurality of windows on a display device using a color map type control method. By providing an arithmetic unit and a color signal generator, color signals can always be generated using a window-specific LUT (window LUT), and the effect is that the original colors can be displayed for all windows. .

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention, Part 2 is a diagram showing an example of a screen displayed on the display device in Fig. 1, and Fig. 3 is a screen shown in Fig. 2. 4 is a block diagram showing the configuration of the color signal generator in FIG. 1, and FIG. 5 is a diagram showing the processing of the arithmetic unit in FIG. 1. FIG. In the figure, 10l...CPU, 102...Main memory, 103...Frame bus sofa, 104...Window management table, 105.
... Arithmetic unit, 106 ... Window ID line bar sofa, 10
7...Color signal generator, 108...Display display device, 401.
...Register A1 402 ...Register B1 403 ...I-UT reference address generator, 404
...LUT,

Claims (1)

[Claims] In an information processing system that displays a plurality of windows on a display device using a color map type control method, there is provided a window management table that manages window IDs and coordinate values of each window; a window ID line buffer that stores the window ID for each scan, an arithmetic unit that stores the window ID of each pixel in the window ID line buffer based on the window management table for each scan, and an LUT consisting of a plurality of window LUTs. and a color signal generator that generates a color signal based on the window ID stored in the window ID line buffer by the arithmetic unit and the color code in the frame buffer and outputs it to the display device. screen display control method.