JPH05341769A - System for tranferring image data - Google Patents

Abstract

PURPOSE:To display a moving image at high speed by raster-operating moving origin image data with moving destination image data and combining a write cycle writing in a moving destination image memory. CONSTITUTION:Latched image memory read data 11 is stored in a register file 13. At a writing time of a read modify write cycle, CPU input data 20 is selected by a selector 21 and inputted to a raster operation circuit 16 for making a background pattern. By the raster operation circuit 16, raster operation specified in an ROC register 17 is executed by the CPU input data 20 and the image memory read data 11 read from the image memory and the background pattern generated by the result of the operation is outputted as image memory write data 18. Further, when a write mask is masked by bit, WPB data 19 is used and mask-processed by the image memory write data 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image data transfer system, and more particularly, to an image data transfer system for displaying an image in which another image is moving on a background pattern and for moving and displaying the image at high speed with a simple structure. Regarding

[0002]

2. Description of the Related Art Moving image display for displaying a state in which another image moves on a background image is widely used as a general image display technique. Various techniques are used as a method for realizing moving image display, and one technique among them is to read the contents of the image memory once, perform appropriate arithmetic processing, and then display the contents on the display.
Conventionally, as an image data transfer system of a display device using this type of display technology, for example, there is one as shown in FIG.

FIG. 3 is a block diagram showing functional blocks of a conventional image data transfer system. In the figure, the functional block in the conventional image data transfer system is the read data 11 of the image memory read by the read command.
An image memory read data latch process 12 for latching the image memory read data 11, a register file 13 for storing the image data latched by the image memory read data latch process 12, and image data are configured. A barrel shifter 14 for shifting bit data, a shift amount register 15 for storing the shift amount of the barrel shifter 14, write data (moving source image data), and image memory data (moving destination image data) of a write target address, And a ROC register 1 for storing a code indicating the type of raster operation performed by the raster operation circuit 16.
7, write data 18 to the destination image memory raster-calculated by the raster calculation circuit 16, and WPB data 19 for write-masking each bit when writing the image memory write data 18 to the image memory. ing.

Next, the operation of the conventional image data transfer system configured as described above will be described. To move the image displayed at a certain position on the display to another position, or to copy the image displayed at a certain position on the display to another position, first move to the source image memory. Read command.

The image memory read data 11 of the moving source read by the read command from the CPU is temporarily latched by the image memory read data latch process 12. The image memory read data 11 latched by the image memory read data latch processing 12 is input to the raster calculation circuit 16 for performing raster calculation with the image data of the image memory corresponding to the address of the movement destination or the copy destination. The type of raster calculation between the image data at the destination of movement or the copy destination and the image memory read data 11 is RO.
It is specified in the C register 17. ROC register 1
The raster calculation specified by 7 is executed, and the write data to the destination image memory is the image memory write data 18
Is output as. When the write mask is applied in bit units when the image memory write data 18 is written in the image memory, the WPB data 19 is used.
The image memory write data 18 masked by the WPB data 19 is written in the image memory. By repeating the above-mentioned read / write operation to the image memory, the movement or copying of the image is realized.

Next, when moving or copying image data accompanied by pixel-by-pixel movement, the image memory read data 11 latched by the image memory read data latch process 12 is stored in the register file 13. When the image data stored in the register file 13 is shifted in bit units in the raster direction, the shift amount is input to the barrel shifter 14 from the shift amount register 15 that holds the shift amount. Then, the image data of the register file 13 is shifted in the raster direction and the output data is converted to the raster operation circuit 16
To enter. In the processing after being input to the raster operation circuit 16, the raster operation designated by the ROC register 17 is executed, and the write data to the destination image memory is output as the image memory write data 18, as in the above-described processing. It When the write mask is applied in bit units when the image memory write data 18 is written in the image memory, the WPB data 19 is used. The image memory write data 18 masked by the WPB data 19 is written in the image memory. Also in this case, by repeating the read / write operation to the image memory,
Image movement or copying is realized.

[0007]

Since the conventional image data transfer method is configured as described above, the image data of the moving source remains in the original state even when the image is moved. After moving the image, it is necessary to write the background pattern at the data address of the moving source. Therefore, since the movement of the image and the writing of the background pattern to the movement source image memory are serial, there is a problem that the movement processing of the image data eventually takes time.

The present invention has been made in order to solve the above problems, and when an image displayed at a certain position on the display is moved to another position, reading of the image memory of the movement source is performed. The background pattern is written to the movement source image position in one memory cycle, and the movement source image data is written to the movement destination image memory in the next write cycle to display the movement image at high speed. The purpose is to get a scheme.

In addition, moving images are displayed at high speed,
It is an object of the present invention to obtain a high-speed transfer method of image data that can select a conventional image data transfer method, and further to provide an image display device suitable for these methods.

[0010]

In order to achieve the above object, the image data transfer system according to the first invention is an image memory for displaying an image on a display, and image data stored in the image memory. In the image data transfer method of a display device that displays a moving image, a register file for temporarily storing the moving source image data read from the image memory is provided. Using the image data stored in the register file and the data from the CPU, raster operation is performed by the raster operation circuit to create background data, and the original image data of the image memory is read and the original image data position of the image memory is read. The background pattern writing of is performed in one memory cycle, while the moving source image stored in the register file is Performs image data and raster operations of the destination address data, characterized in that to realize a display of a mobile image by writing to the image memory.

The image data transfer system according to the second invention comprises an image memory for displaying an image on a display and a raster operation circuit for performing raster operation on the image data stored in the image memory. In the image data transfer system of a display device for displaying a moving image, a register file for temporarily storing the moving-source image data read from the image memory and a copy changeover switch for instructing a copying operation are provided. When the changeover switch is OFF, the raster calculation circuit performs raster calculation using the movement source image data stored in the register file and the data from the CPU to create background data, and the movement source image data in the image memory is stored. Reading and writing the background pattern to the source image data position of the image memory can be performed in one memory cycle. Then, the moving source image data stored in the register file is rasterized with the image data of the moving destination address and is written in the image memory to display the moving image. On the other hand, when the copy changeover switch is ON, No processing is performed on the position of the source image data, and the source image data stored in the register file is rasterized with the image data of the destination address and written to the image memory to write the source image data to the destination. It is characterized in that it is copied to the image memory address and displayed.

[0012]

Therefore, according to the image data transfer method of the first aspect of the present invention, when performing the moving image display for displaying the state in which another image moves on the background image, the read-modify-write operation is performed on the source image memory. Depending on the cycle, the reading of the image data and the writing of the background pattern are performed in one memory cycle. Therefore, by combining the write cycle of writing the source image data with the destination image data and performing the raster operation to the destination image memory, The moving image can be displayed at high speed.

Further, according to the image data transfer system of the second invention, a moving image display for displaying a state in which another image moves on the background image can be performed at high speed, and the image is copied. In this case, since a normal read cycle is performed on the source image memory by the copy changeover switch, the source image data can be copied to the destination image memory while the source image memory remains unchanged.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the functional blocks of the image data transfer system according to this embodiment. It should be noted that in FIG. 1, the same or corresponding parts as those of the conventional technique are designated by the same reference numerals and the description thereof will be omitted.

In the figure, a functional block in the image data transfer system of this embodiment sends write data to the image memory in a read-modify-write cycle when displaying a state in which another image moves on the background image. CPU input data 20 used when writing
And a selector 21 for selecting the CPU input data 20 and the output data from the barrel shifter 14 that shifts the bit data forming the image data read from the image memory.

Next, the operation of the functional blocks in the image data transfer system of this embodiment configured as described above will be described. When performing a moving image display that displays a state in which another image moves over the background image, a read-modify-write cycle is executed for the moving-source image memory, and the moving-source image memory read in that memory cycle The read data 11 is temporarily latched by the image memory read data latch process 12. The latched image memory read data 11 is stored in the register file 13. At the time of writing in the read modify write cycle, the CPU input data 20 is selected by the selector 21 and input to the raster operation circuit 16 to create a background pattern. The raster calculation circuit 16 is the CPU
A raster operation designated by the ROC register 17 is executed by the input data 20 and the image memory read data 11 read from the image memory, and the background pattern generated as a result is output as the image memory write data 18. Further, when the write mask is applied on a bit-by-bit basis when writing the write data in the image memory, the WPB data 19 is used to mask the image memory write data 18.

FIG. 2 is a diagram showing a timing chart of the read-modify-write cycle of the image memory. In the figure, the row address and the column address of the source image memory are designated by the notRAS signal and the notCAS signal, and the image data of the image memory designated by the address is read out as read data by the notOE signal. Then, the read data read by the notOE signal is stored in the register file 13. Subsequently, the background pattern data is written as write data by the notWE signal at the same address that is read out ahead of the source image memory.
After that, the source image memory read data 11 stored in the register file 13 is written in the address of the destination image memory in the next write cycle.

When a pixel unit is moved when writing to the image memory of the moving source, the shift amount when the image data stored in the register file 13 is shifted in bit units in the raster direction is held. The shift amount is input from the shift amount register 15 to the barrel shifter 14, and the barrel shifter 14 shifts the image data of the register file 13 in the raster direction based on this shift amount. When writing the output data from the barrel shifter 14 to the destination image memory, the output data from the barrel shifter 14 is selected by the selector 21 and input to the raster operation circuit 16. When the source image data input to the raster operation circuit 16 by the selector 21 and the image data of the destination image memory are rasterized, a read modify write cycle is executed at the time of writing. Then, the output data from the barrel shifter 14 and the read data from the destination image memory are used to perform the raster calculation designated by the ROC register 17, and the image memory write data 18 is output. When write masking the image memory write data 18,
WPB data 19 is used to write mask write data.

If the selector 21 does not perform the raster operation on the source image data input to the raster operation circuit 16 and the image data in the destination image memory,
A normal image memory write cycle is executed, and the source image data is written in the destination image memory.

Image memory read data 11 using the read modify write cycle of the image memory described above.
It is possible to display the moving image at high speed by repeating the reading of the data, the writing operation of the background pattern, and the writing operation to the moving destination image memory using the normal write cycle of the image memory.

On the other hand, when copying the image data in the source image memory, when reading the image data from the image memory, the normal read cycle is executed instead of the above-described read-modify-write cycle. The read data read from the image memory is input from the image memory read data latch process 12 to the raster operation circuit 16,
Written to the destination image memory. When the image memory read data 11 is written in the destination image memory and the movement is performed in pixel units, the source image data latched by the image memory read data latch process 12 is stored in the register file 13. Next, the shift amount determined by the shift amount register 15 holding the shift amount of the image data is input to the barrel shifter 14, and the barrel shifter 14 shifts the image data of the register file 13 in the raster direction based on this shift amount. To do.

In the process of actually writing the write data to the destination image memory address, the read-modify-write cycle is performed on the destination image memory in order to perform the raster calculation of the image data in the destination image memory and the source image data. When the raster calculation is not performed on the image data in the destination image memory and the source image data, the normal write cycle is performed on the destination image memory. The processing contents of the raster operation circuit 16 and thereafter are the same whether the image is moved or copied.

[0023]

As described above, according to the image data transfer method of the present invention, when the moving image display is performed to display the state in which another image moves on the background image, the read to the moving source image memory is performed. By the modify write cycle, the reading of the moving source image data and the process of writing the background pattern at the moving source image position are performed in one memory cycle, and the moving source image data read in the next write cycle is transferred to the moving destination image data and the raster. Since the calculation is performed and the data is written in the destination image memory, the moving image display for moving the image data can be performed at high speed with a simple configuration.

Further, when copying an image, a normal read cycle is performed to the source image memory by switching the copy changeover switch as in the conventional case, and the source image data is left unchanged and the image data is transferred to the destination. Since the image data is copied to the image memory, it is possible to copy and move the image data at high speed with a simple structure.

[Brief description of drawings]

FIG. 1 is a block diagram showing functional blocks of a high-speed transfer method of image data according to an embodiment.

FIG. 2 is a diagram showing a timing chart of a read-modify-write cycle of an image memory when an image is moved by the high-speed transfer method of image data according to the present embodiment.

FIG. 3 is a diagram showing functional blocks of a conventional image data transfer system.

[Explanation of symbols]

 11 image memory read data 12 image memory read data latch process 13 register file 14 barrel shifter 15 shift amount register 16 raster operation circuit 17 ROC register 18 image memory write data 19 WPB data 20 CPU input data 21 selector

Claims (2)

[Claims] 1. An image data of a display device for displaying a moving image, comprising an image memory for displaying an image on a display and a raster operation circuit for performing a raster operation on the image data stored in the image memory. In the transfer method, background data is created by performing a raster operation using a register file for temporarily storing the movement source image data read from the image memory and the image data stored in the register file and the data from the CPU. It is equipped with a raster operation circuit, and by performing a read-modify-write cycle on the source image memory, the process of reading the source image data and writing the background pattern to the source image position
The number of memory cycles is increased, and at the same time, the raster image is calculated from the source image data and the destination image data stored in the register file in the next write cycle, and the raster image is written to the destination image memory to display the moving image at high speed. Image data transfer method characterized by realization. 2. An image of a display device for displaying a moving image, comprising an image memory for displaying an image on a display and a raster operation circuit for performing an raster operation on image data stored in the image memory. In the data transfer method, background data is created by performing a raster calculation using a register file for temporarily storing the movement source image data read from the image memory and the image data stored in the register file and the data from the CPU. When the copy changeover switch for turning off the copy source switch is turned off, a read modify write cycle is executed for the move source image memory to read the move source image data and move the source image data. Write the background pattern to the image position in one memory cycle. At the same time, in the next write cycle, the raster image is calculated from the moving-source image data and the moving-destination image data stored in the register file, and the moving-image is displayed by writing to the moving-destination image memory. When the switch is ON, no processing is performed at the movement source image data position, and the movement source image data stored in the register file is rasterized with the image data at the movement destination address and written in the image memory. An image data transfer method characterized by copying the source image data to the destination image memory address and displaying it.