JP3337934B2 - Blink display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a blink display method for blinking (flashing) an image on a screen.

[0002]

2. Description of the Related Art Windows, which is an operating system developed by Microsoft Corporation in the United States,
When a graphics function is called from the application software supporting Windows, GDI (Graphics Dev
ice Interface) processes this call and passes it to the appropriate device driver. The GDI of Windows itself does not allow blinking of line segments etc. (hereinafter referred to as "vector graphics"). To execute blinking of vector graphics from Windows compatible application software, It is necessary to perform a process of changing the display color of the vector graphic every predetermined time.

FIG. 1 shows an example of a blink display method based on such an idea. The drawing data 3 is stored in the hard disk 2 in the figure. When displaying an image in accordance with the drawing data 3, a screen DC (Device Contex) which is a storage area having a coordinate system corresponding to a display screen (not shown) is displayed.
t) This drawing data 3 is transferred onto 1. Screen DC1
Transferring and storing the drawing data 3, that is, the image data indicating the image to be displayed, is called "drawing" here, and the drawing process is executed by the main process 6. Further, when the blink applicable data 4 is included in the drawing data 3, that is, when the graphic 5 to be blinked is included in the drawing data 3 on the screen DC1, (1
00), the blink processing process 7 is activated, and while changing the (103) color at predetermined time intervals, for example, 0.5 seconds, (10)
1) The corresponding blink data 4 is redrawn on the screen DC1 (redraw: 102). By performing such processing, the graphic 5 can be blinked at a predetermined cycle, for example, one second, even though the GDI does not support the blinking function of the vector graphic.

However, in such a method, the blink applicable data 4 must be redrawn every predetermined time, for example, every 0.5 seconds. When the amount of blink applicable data 4 is small or large, redrawing cannot be completed before the next redrawing, and as a result, blinking may not be possible.

[0005]

SUMMARY OF THE INVENTION One of the objects of the present invention is to provide a display method capable of always blinking with the same performance regardless of the amount of blink applicable data 4. In the present invention, this object is exclusive. This is achieved by updating image data using a logical OR (XOR) operation. That is, one of the preferred embodiments of the present invention is to display the drawing data 3 stored in a large-capacity storage medium,
When a drawing process to be written on the screen is executed and an image corresponding to the drawing data 3 is displayed based on the drawing data 3 on the screen DC1 having a coordinate system corresponding to the screen, the screen DC
A drawing process of writing blink-corresponding data 4 indicating an image to be blink-displayed among the drawing data 3 on the memory 1 from the large-capacity storage medium to a memory DC having a coordinate system corresponding to a screen, and The XOR of each bit constituting the screen DC1 and the corresponding bit constituting the memory DC is transferred to the screen DC1 by BitBlt. In such an embodiment, it is not necessary to redraw the blink applicable data 4 on the screen DC1 for blink display, and the bit of the XOR value is transferred from the memory DC to the screen DC1.
It is only necessary to execute Blt transfer. The time required for the BitBlt transfer is a short time defined by the XOR operation time. Therefore, in the present embodiment, the blink display process can always be executed with the same performance regardless of the amount of the blink applicable data 4.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an outline of a blink display method according to a preferred embodiment of the present invention. In this embodiment, at the time of blink display, the main process 6A first draws the drawing data 3 on the hard disk 2 on the screen DC1, and then stores the blinking data 4 in the drawing data 3 on the hard disk 2 into the memory DC8. Draw on top. memory
DC8 is a storage space (or memory) according to a coordinate system corresponding to the display screen, just like the screen DC1. The blink processing process 7A calculates the XOR value of each bit value of the data on the screen DC1 and the corresponding bit value of the data on the memory DC8, and performs a BitBlt transfer process of transferring the XOR value to the screen DC1 (200) for a predetermined time. For example, every 0.5 seconds (201). Therefore, in the present embodiment, it is not necessary to redraw the screen DC1 for blinking, and after drawing the blinking data 4 in the memory DC8, BitBlt transfer that is relatively simple, that is, can be executed in a short time, is performed. Since it is only necessary to perform it at predetermined intervals, the blink performance can be maintained regardless of the amount of the blink applicable data 4.

One of the reasons why such a blink display process is possible is that, as shown in FIG.
The XOR operation is performed on the result of the XOR operation, and the result is further subjected to the XOR operation on the second data, whereby the first data is reproduced. In the present embodiment, this property is used. For example, it is assumed that data including blink applicable data 4 exists on the hard disk 2 as shown in FIG. In the present embodiment, the main process 6A draws this data on the screen DC1 (FIG. 4).
(2)) Further, the blink applicable data 4 is drawn in the memory DC8 (FIG. 4 (5)). Then, the XOR value of the data shown in FIG. 4B and the data shown in FIG.
After the Blt transfer, the content of the screen DC1 becomes the content as shown in FIG. After a predetermined time has elapsed, the XOR value of the data shown in FIG. 4 (3) and the data shown in FIG. 4 (6) (that is, the data on the memory DC8 = the data in FIG. 4 (5)) is displayed on the screen DC1. After the BitBlt transfer, the content of the screen DC1 becomes the content as shown in FIG. FIG.
(4) represents the same data as in FIG. 4 (2). In the present embodiment, blink display is realized by repeatedly executing BitBlt transfer by using the XOR operation as described above.

[0009]

[Addendum] In the above explanation, Microsoft's Wind
ows GDI is used as an example.
The present invention can be applied to other environments having the same or similar features and restrictions as those of ws GDI. Further, since BitBlt transfer, DC, and the like are well known to those skilled in the art, detailed description is omitted. Further, the illustration of a processor for executing a main process and a blink processing process or a partial circuit thereof is omitted. However, this is an obvious omission, and the understanding and implementation of the present invention by a person skilled in the art is prevented by the omission of the illustration. Never. The large-capacity storage medium for storing the drawing data 3 is not limited to a hard disk.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a blink display method under a Windows environment.

FIG. 2 is a diagram showing a blink display method according to a preferred embodiment of the present invention.

FIG. 3 is a diagram for explaining a property of an XOR operation.

FIG. 4 is a diagram showing changes in the contents of a screen DC and a memory DC.

[Explanation of symbols]

1 screen DC, 2 hard disk, 3 drawing data, 4
Blink applicable data, 5 figures to blink, 6A
Main process, 7A blink processing process, 8
Memory DC.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-242989 (JP, A) JP-A-62-129885 (JP, A) JP-A-63-1103386 (JP, A) JP-A-4- 170632 (JP, A) A Young / Kyosuke Kawate, X Toolkit Programming, Japan, Toppan Co., Ltd., March 20, 1995, 2nd edition, p. 368-370 (58) Field surveyed (Int.Cl. ⁷ , DB name) G09G 5/10 G06F 3/00 G06F 3/14

Claims (1)

(57) [Claims] 1. A drawing process for writing drawing data stored in a large-capacity storage medium on a screen DC is performed, and based on drawing data on the screen DC having a coordinate system corresponding to the screen.
When displaying an image corresponding to the drawing data, blinking data indicating an image to be blink-displayed among the drawing data on the screen DC is transferred from the large-capacity storage medium to the memory DC having a coordinate system corresponding to the screen. Executes drawing processing to write, and performs BitBlt transfer to the screen DC at predetermined intervals of exclusive OR of each bit configuring the screen DC and each corresponding bit configuring the memory DC Blink display method.