JPH0659664A - Pattern picture drawing processing method using cash image - Google Patents

Abstract

PURPOSE:To provide a method to carry out picture-drawing processing of continuous same patterns at high speed while finishing computing process from a picture-drawing pattern data to a bit image at one time. CONSTITUTION:A data input processing part 1 receives an input picture-drawing data and compares the picture-drawing pattern data and a held data of a picture-drawing pattern data memory 2. In the case where they are different patterns or there is no held pattern, control is moved to a data processing part 3, and when they are the same patterns, control is moved to a picture- drawing processing part 5. The data processing part 3 stores the picture-drawing data in the picture-drawing pattern data memory 2, calculates a bit image and stores it in an image cash memory 4. At the picture-drawing processing part 5, a held bit image of the image cash memory 4 is read out, an address on a frame memory is calculated from a picture-drawing coordinate data out of the input picture-drawing data, the aquired bit image is written in it and a picture-drawing is displayed on a bit map display.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pattern drawing processing method using a cache image, and particularly to a pattern drawing system for accessing a frame memory mapped in a memory space to perform drawing on a bitmap display. Regarding the drawing processing method.

[0002]

2. Description of the Related Art Input data for performing pattern drawing processing consists of drawing pattern data showing an image of a drawing pattern and drawing coordinate data showing a drawing position. Conventionally, pattern drawing processing is performed by calculating a bit image of a drawing pattern from drawing pattern data, calculating an address on a frame memory from drawing coordinate data, and writing the obtained bit image at the address.

[0003]

In the conventional pattern drawing processing method, when a plurality of pattern drawing processes are performed, the bit image is calculated every time even when the drawing pattern data is continuous. For this reason, when the same pattern is drawn many times, a huge amount of time is spent on the calculation processing of the same bit image each time.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems, and only when the drawing pattern data of the input drawing data is different from the drawing pattern data of the latest pattern drawing processing in the past, the drawing pattern data is obtained. From the image cache memory to the bit image, hold the obtained bit image in the image cache memory, and if the drawing process of the same pattern continues, copy the data in the image cache memory to the frame memory to draw. The purpose is to speed up the drawing process of the same continuous pattern by not performing the same calculation process of the same bit image. Therefore, the pattern drawing processing method using the cache image of the present invention is
By using the bitmap display as a display device and accessing the frame memory mapped in the memory space,
When a pattern is drawn in a system that draws on a bitmap display, the data input / pre-processing unit that accepts input drawing data, and the drawing pattern data of the input drawing data is the latest pattern drawing process in the past. A data processing unit that calculates a bit image of the drawing pattern when it differs from the drawing pattern data of
The drawing pattern data memory that holds the drawing pattern data of the input drawing data, the image cache memory that holds the bit image of the drawing pattern, and the address on the frame memory indicated by the drawing coordinate data of the input drawing data at the address above. In the case of performing pattern drawing with a drawing processing unit that writes data in the image cache memory, in the case of drawing the same bit image as in the past pattern drawing processing in the past, calculation processing from pattern data to bit image is performed. The feature is that the pattern drawing is performed at high speed by copying the data of the image cache memory to the frame memory without performing it.

[0005]

Embodiments will be described below with reference to the accompanying drawings.

FIG. 1 shows the configuration of an embodiment of the present invention, and FIG. 2 shows the processing of this embodiment. In FIG. 1, an embodiment of the present invention comprises a data input / preprocessing unit 1, a drawing pattern data memory 2, a data processing unit 3, an image cache memory 4 and a drawing processing unit 5. The data input / preprocessing unit 1 receives input drawing data and compares the drawing pattern data of the input drawing data with the drawing pattern data held in the drawing pattern data memory 2. Drawing pattern data memory 2
Holds the drawing pattern data of the bit image currently held in the image cache memory 4. The data processing unit 3 calculates a bit image from the drawing pattern data of the input drawing data and stores it in the image cache memory 4. The drawing processing unit 5
The address on the frame memory is calculated from the drawing coordinate data of the input drawing data, and the bit image stored in the image cache memory 4 is written to the obtained address.

Next, the operation of this embodiment will be described with reference to FIG. First, when the data input / preprocessing unit 1 receives the input drawing data (step 21), the drawing pattern data of the input drawing data is compared with the drawing pattern data held in the drawing pattern data memory 2. (Step 22), if the patterns are different,
Alternatively, if no data is held in the drawing pattern data memory 2, control is transferred to the data processing unit 3. When the patterns are the same, control is transferred to the drawing processing unit 5. When the control is transferred to the data processing unit 3, the drawing pattern data of the input drawing data is stored in the drawing pattern data memory 2 (step 23) and the bit image is calculated from the drawing pattern data (step 24) to obtain the data. The stored bit image is stored in the image cache memory 4 (step 25), and the control is transferred to the drawing processing unit 5. When the control is transferred to the drawing processing unit 5, the bit image held in the image cache memory 4 is read (step 26), and the address on the frame memory is calculated from the drawing coordinate data of the input drawing data (step 27). , Step 2
The bit image obtained in step 26 is written to the address obtained in step 7 (step 28), and drawing is performed on the bitmap display.

[0008]

As described above, according to the present invention, in the pattern drawing process, when the drawing of the same pattern is continuous, the calculation process from the drawing pattern data to the bit image only needs to be performed once, so that the same continuous pattern is drawn. The drawing process of can be performed at high speed.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a diagram showing a flowchart for explaining the processing of this embodiment.

[Explanation of symbols]

 1 data input / pre-processing unit 2 drawing pattern data memory 3 data processing unit 4 image cache memory 5 drawing processing unit

Claims (1)

[Claims] 1. A system for accessing a frame memory mapped in a memory space and performing drawing on a bit map display, when performing pattern drawing,
A data input / preprocessing unit that receives input drawing data,
Holds the data processing unit that calculates the bit image of the drawing pattern when the drawing pattern data of the input drawing data differs from the drawing pattern data of the latest pattern drawing process in the past, and the drawing pattern data of the input drawing data A drawing pattern data memory, an image cache memory that holds a bit image of the drawing pattern, and a drawing processing unit that writes the data of the image cache memory to an address on the frame memory indicated by the drawing coordinate data of the input drawing data. In case of pattern drawing, if the same bit image as in the past pattern drawing process in the past is drawn, the data in the image cache memory is transferred to the frame memory without performing the calculation process from the pattern data to the bit image. copy The Rukoto, the pattern drawing process method using a cache image, characterized in that the pattern writing.