WO1987003409A1 - Multiwindow picture display method - Google Patents

Abstract

A method of displaying a multiwindow picture, wherein the picture data of window picture are stored in a window buffer (13), a relationship between a position on a CRT (18) of a reference point (e.g., left upper corner) of window picture and a storage position in a window buffer (13) which stores picture data on said reference position is stored in a first memory (14) as a window parameter for every window picture, and data for specifying the window picture to be displayed on each pixel is stored as a visible map in a second memory (15) which is provided to correspond to each of the pixels of the picture. A multiwindow picture is displaced through the steps of monitoring the present position of beam by horizontal and vertical counters (11, 12), finding out the data from the visible map to specify the window picture displayed on a pixel on which the beam is now located, finding out a window parameter corresponding to the above window picture from the first memory (14), forming an address in the window buffer (13) from the present position of the beam and the above window parameter, reading the picture data of the window picture from the above address and displaying it on the CRT (18).

Description

 Specification

 Multi-window image display method,

 Technical field

 The present invention relates to a multi-window image display method, and particularly to an image displayed on a display screen by a refresh operation by a raster scan. The present invention relates to a multi-window image display method of a display device for displaying the image.

 Background art

 You may want to display one or more window images on the display screen (CRT surface). For example, as shown in FIG. 7, when it is desired to display window images Wl, W2, and W3 in the display areas la, lb, and lc of the CRT surface 1, respectively. is there .

 Note that Β and Β are backgrounds, and the window image has a higher display priority as the numerical value attached to the alphabet W is larger. That is, in the example of FIG. 8, the display priority is Wl <W2 <WS. When the window images overlap, the display priority is the highest. Only the window image is displayed on the CRT.

In such a multi-window image display, a frame buffer having a memory area corresponding to each picture element (pixel) of the conventional screen is used. Along with the memory FBM, a window buffer memory WBM that stores the image data of each window and image is provided, and the display priority is low. C Read the image data from the WBM in order of the images. Block data is transferred to the frame memory FBM and written (the data written later is overwritten by the previous data). The part where the window image overlaps will be displayed on the CRT so that the image written to the frame memory later will be displayed on the CRT. Display of window image has been achieved.

 However, in such a conventional multi-window image display method, every time a predetermined window image is changed, in other words, a window buffer is used. Every time a window image is modified, the entire window is saved from the window's memory to the frame's memory FBM. Block transfer and writing of window images had to be performed, resulting in reduced processing efficiency and the inability to display images immediately. .

 In addition, even when it is desired to appropriately switch and display only a predetermined window image without changing the window image, the above-described block transfer Z writing process is required each time. become .

 From the above, the object of the present invention is to perform window transfer of a window image to a frame buffer memory from a window buffer memory. It is to provide a powerful multi-window image display method.

 Another object of the present invention is to provide a multi-window image display method in which it is not necessary to store an image of one screen to be displayed on a CRT in a frame buffer memory. It is to provide.

Disclosure of the invention The image data of each window image is recorded in the window buffer, and the position of the window image on the CRT screen and the window buffer are stored in the window buffer. The relationship between the stored positions in the first window is stored in the first memory as window parameters for each window image. Pixels) are stored in the second memory corresponding to each pixel, and data specifying the window image to be displayed in each pixel is recorded as a visibility map. Let it be billion.

 When displaying a multi-window image, the current position of the beam is monitored, and the window image displayed on the pixel where the beam is currently located is displayed. The data to be specified is obtained from the visibility map, the window parameter corresponding to the window image is obtained from the first memory, and the beam is obtained. The current position and the window. An address in a window window is generated from the parameters and the image data of the window image is read out from the address, and the CRT is read. Displayed in.

 BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a block diagram of a main part of a display device for realizing the present invention,

 Fig. 2 shows a display example of a multi-window image.

 Figure 3 is an illustration of the visibility map,

 Fig. 4 is a diagram explaining the contents of the window parameter memory.

 Figure 5 is an explanatory diagram of the window parameter.

FIG. 6 is a block diagram showing a main part of another display device according to the present invention. Figure,

FIG. ⁷ is a block diagram of the present invention using a microcomputer.

 Figure 8 shows a conventional multi-window image display

It is a figure.

 BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is a block diagram of a main part of a display device for realizing the present invention.

 11 and 12 are horizontal and vertical counters for monitoring the beam position, and 13 is a window for storing image data of each window image. Novel, 14 is a window. Lambda memory, 15 is a visibility map memory that stores the visibility map, 16 and 17 are adders, and 18 is a brown tube (CRT). is there . '

Horizontal Ca c te 1 1, bi and mosquito window down preparative beam click lock CK in synchronization with the horizontal synchronizing signal S _H that occur or illustrated a yet Timing of signal generator et al monitoring the horizontal position X of the over arm, vertical mosquito c te 1 2 bus vertical synchronizing signal S _v mosquito the beam click lock CK in synchronization with the window down Sorted vertical position bicycloalkyl over beam by y To monitor. Incidentally, the vertical mosquito c te 1 2 but it may also be monitored vertical position y of the beam by counting the horizontal synchronizing signal S _H.

Window data 13 stores image data of all window images to be displayed on CRT 18. For example, if window images 1 to 3 are to be displayed on CRT 18 as shown in FIG. 2, all of these window images 1 to 3 are displayed. 3 is recorded. In addition, this window The key 13 has the same function as the conventional window buffer memory WBM shown in FIG.

 The visibility map memory 15 has a storage area corresponding to each picture element (pixel) of the CRT, and stores the visibility map. Here, the visibility map indicates the visibility level (display priority) for each pixel on the CRT screen. Therefore, the visibility map memory 15 records the visibility level for each pixel, and the part where window images overlap will be described later. Thus, the window image corresponding to the visibility level stored in the memory 15 is displayed on the SCRT. For example, as shown in FIG. 2, window images 1 to 3 are displayed on the CRT 18 (where 1 to 3 are the numbers identifying the window images and the visibility level). ) Is displayed in the storage area corresponding to each pixel of the visibility map memory 15 as shown in Fig. 3.可視 The visibility level (window number) 0 to 3 of the window image is recorded. However, 0 is the background. It should be noted here that the visibility level and the window number match.

As shown in Fig. ⁴ , the window parameter memory 14 has a window parameter corresponding to the visibility level (window number). It is used to memorize the data, and if it is possible to display a window image with a maximum of 16 values on one screen, it corresponds to the visibility level 1 to 16 Record the window parameters ΔX and mm, respectively. Here, the window parameters ， and y are parameters having the following meanings. It is.

As shown in FIG. 5 (A), the position of the reference point _Pc , which is the upper left corner of the window image WD, on the display screen (CRT) is represented by ( _Xc , _c , ) And the storage position in the window buffer 13 storing the image data at the reference point is shown in FIG. 5 (B). by cormorants to (x _R, y _R) if Re be a, c c i down de that corresponds to the fin-de-window any of Po Yi down capital Q on the image WD (X, y) c bus Tsu off § 1 The storage position P (X p, yp) of 3 is

x _p = x _R + (x— x _c ) yp = y R ÷ (yy _c )

It is expressed by '. Here, A x, mu y

X = x _R — X _c

y _p = y + mu y

It becomes. These Δx and Δy are the windows. Ri Oh La main one data, window display position of the fin-de-window image (x _c, y _c) and the window fin-de-window bus Tsu off § 1 3 of the serial billion position (X _R, y _R) is Kemah If it is, it will be a known value.

The reference point _Pc may be a point at the upper right corner, lower right corner, or lower left corner of the window image. To extend (X, y) not only in the window but also as an arbitrary point on the screen, set ΔX and Δy to the visibility level (window inspection). No.) As a function of V χ _ρ = χ + Δ χ (V)

And However,

X (VJ = x _R (VJ-x _c (VJ

V _L = f (x, y)

 Hereinafter, the operation of FIG. 1 will be described. However, window images 1 to 3 shall be displayed as shown in FIG.

 The display processor (not shown) can be used, for example, to display each window image, display priority, and CRT image from the host device.

Display position on ¾ (X y U fin de window Nono 'serial billion position on click off § (X _R, when y _R) is are entered,

 (a) The image data of the window images 1 to 3 are recorded in the window

 (b) Each window image:! Window parameters of 3 ， ， 厶 j j j j j j j j j j j j (j = 1, 2, 3) Window numbers) 1, 2, and 3 are recorded in the window parameter memo 'J14', and

(c) Generate a visibility map using the position data on the CRT of the window image and the visibility level (window number) of the window image Then, as shown in Fig. 3, the visibility map is shown in Figure 15. Note that the visibility map is the force that is written to memory 15 by overwriting, and if overwriting, the visibility level of the overwriting and the visibility that has already been written. Compare levels by pixel and overwrite only if the level to be overwritten is low. Therefore, the order of writing to the visibility map memory 15 does not depend on the visibility level.

 As described above, if the window image data, window parameters, and visibility map are stored in each of the memories 13 to 15, the following is true. Then, the image data to be displayed in the pixel located at the beam position is read from the window buffer 13.

 Each of the horizontal counter 11 and the vertical counter 12 counts the beam clock CK and outputs the beam position (X, y).

The visibility map indicated by the pixel address (for example, X and y arranged in series) corresponding to the beam position (X, y) 1 From 5, after determining the visibility level (window number) V of the window image displayed in the pixel, the visibility level V c Lee down de cormorant path ra one data厶x that corresponds to the teeth, window fin-de-window Meme ⁰ ra one data MEMO Li 1 4 or al Ru asked to厶y.

Then, the position (X _p , X _p ) in the window buffer 13 where the image data of the pixel corresponding to the beam position is stored in the adders 16 and 17. y _p )

(+ Δ) → X _p

 (y + Δ y) → y p

Seeking Ri good, the x _P, y _P by Ri of c i down de © bus Tsu off § 1 3 one

(When was example x _p, also arranged a y _p in series) A de Re scan that the forms raw. Then, the image data is read from the storage area of the window buffer 1 S indicated by the generated address and input to the CRT 18.

 Thereafter, the above process is repeated according to the beam position, so that a multi-window image is displayed on the CRT.

 FIG. 6 is an explanatory view of another embodiment which can process at l / ii speed as compared with the case of FIG. The difference between Fig. 6 and Fig. 1 is that

 (a) Dividing beam CK by one divider II (for example, n = 16) by divider 21: This divider divides the beam CK by π CK 'is counted to monitor the beam position and

(The beam position resolution is compared to the case of Fig. 1, and the position force is identified for each II pixel.)

 (b) The image data corresponding to II pixels from the window 13 is output to the shift register 22 which is a buffer, and the shift register 22 is output. The point is that the image data is output to the CRT one by one in synchronization with the beam clock CK from the register.

In the example shown in Fig. 6, the beam speed can be set at n pixels apart, so the processing speed may be 1 η, but each window is taken. A slight restriction is imposed on the boundary position for insertion. The display device shown in FIGS. 1 and 6 can also be configured using a microcomputer. Fig. 7 shows the display device of Fig. 1 constructed using a microcomputer. In FIG. 7, 11 and 12 are horizontal and vertical counters, 13 is a window notch, 18 is a CRT, 19 is a microcomputer, 2 0 is a lead no-write control unit. In the microcomputer 19, 19a is a processor, 19b is a control program memory (ROM), and 19c is a RAM. It has a top storage area of 19c-1 and a window parameter storage area of 19c-2.

 The processor 19a executes the multi-window image display processing described in connection with FIG. 1 under the control of the control program. Basically, it has the following first to seventh steps. That is,

 The image data of each window image is stored in the window buffer 13 I, ts, "9 'first step,

 基準 Display of the reference point of the window image The position on the screen and the image data at the reference point are recorded. に In the window buffer 13 The second state in which the relationship with the storage location is stored in the storage area 19c-12 of the RAM 19c as a window parameter for each window image. Top,

 In the storage area 19c-11 of the RAMI 9c provided corresponding to each pixel on the screen, a window to be displayed on the pixel デ data for specifying an image The third step is to record the data as a visibility map,

The data that identifies the window image displayed in the pixel where the beam is currently located is obtained from the visibility map storage area 19c-1. Step, Using the data, a window corresponding to the window image ゥ The fifth step in which parameters are obtained from the storage area 19c-2,

 A sixth step for generating an address in the window buffer 13 from the beam current position and the window parameter,

 The image data of the window image is read from the storage area of the window buffer 13 indicated by the address and input to the CRT 18 for display. It has 7 steps. In the above description, the case where the visibility level and the window number are matched has been described, but it is not always necessary to match. However, one window image corresponds to one visibility level, and therefore the window depends on the visibility level. C) It is said that the image has been specified.

 As described above, according to the present invention, an image (image) of one screen in which a plurality of window images are combined as in the related art is called a frame-buffer memory. There is no need to create a new window image in the window buffer when changing the window image. Block transfer of window images from window memory and 'frame memory' to frame memory as in the past. It is now possible to display images instantly if not necessary.

Further, according to the present invention, it is possible to easily change the degree of overlapping of window images only by rewriting the visibility map, and the power is also improved. Just rewrite the window parameters. The displayed contents can be changed instantaneously. So a book? ! According to the description, a window image that dynamically changes like an animation display in a multi-task multi-window environment. It can be realized at very high speed without the need to have a full-screen full-frame image as in the past, even with a still-window image. .

Claims

The scope of the claims  1. Multi-window of the display device that displays an image on the display screen by performing a refresh operation by the raster scan In the image display method,  The first step is to store the image data of each window image in a window buffer.  基準 Display of the reference point of the window image The position of the reference point on the screen and the image data at the reference point are recorded. 億 The position of the reference point in the window buffer The second step is to record the relationship with the window image as a window parameter for each window image. Furthermore, in the storage area provided corresponding to each pixel on the screen, data specifying a window image to be displayed on the pixel is used as a visibility map. The third step to remember,  4th step to monitor the current position of the beam, The window that displays the pixel where the beam is currently located is used to obtain data specifying the image from the visibility map, and the window is also displayed. The window corresponding to the image, the fifth step to find the ^zero radiator,  A sixth step for generating an address in the window buffer from the beam current position and the window parameter, A seventh step for reading the image data of the window image from the storage area indicated by the address and displaying the image data on the display screen. A multi-window image display method that specializes in and. / 03409 _ _lif _ PCT / JP86 / 00602 2 ♦ Claims characterized in that the reference point of the window image in the second step is one of the four corner points of the window image Display method of multi-window image described in item 1 3, the position on the window fin-de-window de office flops of I screen reference points that put the image (x _e, y _c), you serial billion your only that image data to the reference point c Lee down-de-window bus Tsu your only that Symbol billion position in full § (x _R, y _R) and shall be the can, X (= x _R — _c ), Ay (= y _R — y _c ) Window in the second step. The multi-window image display method according to claim 2, which is characterized in that it is a parameter.  4 ♦ In the 6th step, adjust the beam position.  When (X, y),  x + mu X, y + mu y 4. The multi-window image according to claim 3, wherein the multi-window image is awaited to generate the address in a window buffer. Display method.  5 ♦ In the third step, match the data specifying the window image with the visibility level indicating the display priority of the window image. A multi-window image display method according to claim 1, wherein the multi-window image display method is characterized in that. 6. The third step is that the visibility level of the window image is overwritten on the storage area by overwriting the visibility level of the window image for each window image. This override is assumed to be At this time, the visibility level of the window image is compared with the already written visibility level, 範 囲 Claim ⁵ to wait for the level of visibility of the window image to be overwritten in the storage area only when the level of visibility is high Multi-window image display method  7 ♦ The multi-step according to claim 1, wherein the fourth step is characterized in that a beam clock is counted and a current position of the beam is monitored. Window Image display method.  8. The fourth step is: While dividing the beam clock to 1 / n, the clock obtained by the division is counted, the beam position is monitored, and the ^seventh stage is monitored. Outputs image data for n pixels from the window buffer to the buffer, and synchronizes with the beam clock from the buffer. The multi-window image display method according to claim 1, wherein the multi-window image display method according to claim 1, wherein the image data to be displayed in each pixel is sequentially output. Abstract  The present invention relates to a method for displaying a multi-window image. In this multi-window image display method, the image data of the window image is stored in a window buffer (13), and the window data is stored in the window buffer (13). The position of the reference point (eg, upper left corner) of the window image on the CRT (18) and the window buffer (1) that records the image data at the reference point The relationship with the storage position in (3) is stored in the first memory (14) as a window parameter for each window image. In the second memory (15) provided corresponding to each picture element (pixel) on the screen, specify the window image to be displayed in each pixel. Record the data as a visibility map.  When displaying a multi-window image, the current position of the beam is monitored using the horizontal and vertical force counters (11, 12), and the image of the beam where the current beam is located is displayed. The window displayed in the cell ゥ The data specifying the image is obtained from the visibility map, and the window parameter corresponding to the window image is obtained. From the first memory (14), and from the beam current position and the window parameters to the window information (13). An address to be generated is generated, the image data of the window image is read from the address, and displayed on the CRT (18).