JPS63115227A - Picture display address converter - Google Patents

Abstract

PURPOSE:To reduce the processing for address calculation to increase the display speed by providing a mechanism to convert address information referred with a logical address to address information on an actual frame memory. CONSTITUTION:Values X and Y in the coordinate system on a display device corresponding to the origin of a pertinent virtual display device are written in an origin address register 3 (conversion register). A program generates two-dimensional logical address information in a prescribed form and separately prepares picture display data to a pick cell, which can be referred by a corresponding address, and issues the write request to the frame memory. Two-dimensional logical address information is held in a logical address register 1, and physical address information obtained from output information, and the result is stored in a two-dimensional physical address register 2. The frame memory is referred with the output value of the register 2 as the actual address of the frame memory to update picture information of the pertinent pick cell.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a display address conversion device for generating a frame memory address for display data on a bitmap display.

(Prior Art) The bitmap display to which the present invention is directed is connected to a main body processor 100, a main memory 101, etc. by a system path 102 in the form shown in FIG. By updating the contents of the memory 103, the contents displayed on the display 104 are updated. The frame memo 17103 is given a continuous memory space starting from an address (referred to as a frame pace address), and when the main body processor 100 updates the contents of the corresponding address, the display data is also updated.

A typical application of a bitmap display, such as the one shown in Fig.
Each window corresponds to a program, and this program uses the corresponding window as a display. In other words, the window serves as a virtual display for the corresponding program, and the program must operate independently of where the corresponding virtual display is located in the real display coordinate system. Therefore, if you want to update the display contents in a window from a program,
A mechanism is required to convert two-dimensional address information (two-dimensional logical address information) defined in a coordinate system within a window into address information (physical address information) on the actual frame memory.

Conventionally, the first method was to convert the two-dimensional logical address referred to by the program into a frame memory address and directly refer to the one-dimensional frame memory address, and the first method was to convert the two-dimensional logical address referenced by the program into a frame memory address. There is a second method in which the frame memory addresses are individually transferred and the frame memory address is generated by the control unit of the frame memory.

(Problems to be Solved by the Invention) In the first method, all address generation processing is performed by a program, which has the disadvantage that the program becomes complicated and the display speed decreases.

In the second method, a program can refer to a two-dimensional address, but it has the disadvantage that the program must convert a two-dimensional logical address to a two-dimensional physical address, and the display speed decreases. there were.

Therefore, an object of the present invention is to make it possible to transfer a two-dimensional address (two-dimensional logical address) on a virtual screen at one time, and to transfer address information referenced using a logical address to an address on an actual frame memory. In addition to having a mechanism for converting information into information, it is an object of the present invention to provide a screen display address conversion device that reduces address calculation processing and improves display speed.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the screen display address conversion device provided by the present invention includes a logical address register that stores a logical address of a virtual display referenced by a program; A physical address register stores a physical address on the bitmap display, and a conversion register stores position information of the virtual display on the bitmap display.

(Operation) Writes the value (X, Y) t-JiK point address register 3 conversion register) K in the coordinate system on the display of the origin (top left corner) of the corresponding virtual display. The program creates two-dimensional logical address information in the format shown in FIG.
The 02-dimensional logical address information that generates a write request for is held in the logical address register l, and the physical address information is calculated from the output information using the calculation formula shown below, and the result is stored in the two-dimensional physical address register 2. .

(Physical address of 7v-A memory) = (X coordinate value + X coordinate value of origin) + (Y coordinate value + Y coordinate value of origin - 1) * (width size of display) Output of physical address register 2 value frame memory 10
By referring to the frame memory as the real address of 3, the screen information of the corresponding pixel is updated.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention. Hereinafter, the present invention will be explained in detail according to the present example. In a pit map display, the reference unit for the frame memory and the reference unit for display data (vixels) differ depending on how many bits a pixel, which is a display unit, consists of. In this example, for simplicity, the size is width 1024 height 1
024 black and white display. In this way,
l1c1 bit is sufficient to express one pixel.

Register the position of the corresponding virtual display (by writing the value (X, Y) in the coordinate system on the display of the origin (top left corner) of the corresponding virtual display to the origin address register 3.0 At this time, the Y coordinate As the value of , it is sufficient to set a value that is 1 smaller than the actual Prepare screen display data for pixels that can be referenced separately,
Generates a write request to frame memory. As a result, the two-dimensional logical address information is held in the two-dimensional logical address register 1. The two-dimensional logical address register has the format shown in FIG. 3, with the lower 10 bits indicating the X coordinate value and the next 10 bits indicating the X coordinate value.

Origin address register 3 has a similar format, but the lower 1
The 0 bit indicates the X coordinate value of the origin of the corresponding virtual display, and the next 10 bits indicate the value obtained by subtracting 1 from the X coordinate value of the origin. The outputs of the two registers 1 and 3 are input to adder circuits 4 and 5. The adder circuit 4 adds information regarding the X coordinate value, and the adder circuit 5 adds the information regarding the X coordinate value to generate one-dimensional physical address information, and stores the result in the physical address register 2. Here, the multiplication required when converting the X coordinate value into a one-dimensional address does not need to be performed, since it is actually just an adjustment of the bit position in the physical address register. By referring to the frame memory using the output value of the address register 2 as the real address of the frame memory 103, the corresponding screen information is updated. Even when K consists of multiple bits, it is easy to expand K by changing the interpretation of the bit position of the address register.

(Effects of the Invention) As described above, according to the present invention, the conversion process of two-dimensional address information on the display can be performed at high speed, so that the display speed can be improved.

[Brief explanation of the drawing]

FIG. 1 is a book diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an example of the position of the present invention within an information processing device, and FIG. 3 is a block diagram showing an example of the location of the present invention in an information processing device. FIG. 3 is a diagram showing a format of address information. In the figure, 1 is a logical address register, 2 is a physical address register, 3 is an origin address register, 4 and 5 are adder circuits, 100 is a main processor, 101 is a main memory,
102 is a system path, 103 is a frame memory, 10
4 each indicate a display. Agent Patent Attorney Shinsuke Honjo Figure 1

Claims (1)

[Claims] A logical address register stores the logical address of the virtual display referenced by the program, a physical address register stores the physical address on the bitmap display, and the position information of the virtual display on the bitmap display is stored. A screen display address conversion device comprising a conversion register that stores the logical address and a circuit that converts the logical address into the physical address by arithmetic calculation of the logical address and the position information.