JPH05128264A - Frame buffer plotting device - Google Patents

Abstract

PURPOSE:To perform a high-speed plotting by performing the processing of attribute data having a possibility of being commonly specified to all kinds of plotting graphics by an attribute data processing means, performing the processing of data which is not processed by the attribute processing means by the data processing means, and thereby reducing the load of a data processing means regardless of the kinds of plotting primitive. CONSTITUTION:A processor 1 receiving necessary data from a host processor calculates plotting positions and plotting colors and supplies them to an attribute processing hardware 3 via an address bus and a data bus. In the attribute processing hardware 3, attribute instruction data is read from an attribute register 4 and a plotting for a frame buffer 2 is performed based on the address received from the processor 1. Therefore, the attribute processing becomes unnecessary to be performed in the processor 1 and the processing load can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame buffer drawing apparatus, and more specifically to not only drawing with attribute processing such as light mask and raster operation but also drawing without these attribute processing. Also relates to a frame buffer drawing device.

[0002]

2. Description of the Related Art Conventionally, as a simplest structure of a frame buffer drawing device, a structure including only a processor 21 and a frame buffer 22 for performing drawing position, drawing color calculation, write mask, raster operation and other attribute processing is known. (See FIG. 2).

Further, as shown in FIG.
And the frame buffer 32 as well as the processor 3
Also known is a frame buffer drawing device having specific primitive drawing hardware 33 for receiving attribute data, for example, copying, one-color quadrilateral coloring, etc., and drawing primitive designation data from 1 to perform a corresponding drawing process to perform drawing on the frame buffer 32. Has been.

[0004]

In the frame buffer drawing apparatus shown in FIG. 2, all processing is performed by the processor 2.
1 must be performed, and the processing load of the processor 21 becomes significantly large, so that there is the inconvenience that the drawing on the frame buffer 22 cannot be speeded up so much. In the frame buffer drawing device shown in FIG. 3, the drawing of the specific primitive is performed by the specific primitive drawing hardware 33.
By doing so, the drawing speed can be significantly increased and the processing load of the processor 31 can be greatly reduced. However, as for the drawing of primitives other than the specific primitive, all necessary operations are performed as in the frame buffer drawing device of FIG. Since the processing of (1) must be performed by the processor 31, the processing load is significantly increased and the processing speed is also reduced. In addition, the difference in drawing speed between the specific primitive and other primitives becomes significantly large, and the overall balance of the system including the frame buffer drawing device becomes poor.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is possible to increase the drawing speed for a frame buffer regardless of the presence or absence of attribute processing. It is an object of the present invention to provide a frame buffer drawing device capable of preventing the occurrence of the inconvenience of change.

[0006]

In order to achieve the above object, a frame buffer drawing apparatus according to claim 1 processes attribute data which may be commonly specified for all types of drawing figures. It includes attribute data processing means and data processing means for processing data that is not processed by the attribute data processing means.

[0007]

According to the frame buffer drawing apparatus of the present invention, all kinds of drawing can be carried out in the case of performing drawing on the frame buffer by performing necessary processing based on the attribute data and drawing drawing data designated by the application program. The attribute data processing means performs the processing of the attribute data that may be commonly specified for the drawing figures, and the data processing means performs the processing of the data that is not processed by the attribute data processing means. However, the processing load of the data processing means can be greatly reduced, and high-speed drawing can be achieved. The high-speed drawing in this case is a high-speed drawing that is equal to the drawing speed of the drawing primitive when there is no attribute processing, and the drawing speed of the drawing primitive becomes the same regardless of the presence or absence of attribute processing. Good balance of the system including.

[0008]

Embodiments will now be described in detail with reference to the accompanying drawings showing embodiments. FIG. 1 is a block diagram showing an embodiment of a frame buffer drawing device of the present invention, which comprises a processor 1 and
Frame buffer 2, attribute processing hardware 3,
And an attribute register 4.

The attribute register 4 stores attribute instruction data for instructing the type of attribute processing to be performed by the attribute processing hardware 3. The attribute processing hardware 3 performs corresponding attribute processing based on the attribute instruction data stored in the attribute register 4, such as a write mask and a raster operation. The attribute processing that can be processed by the attribute processing hardware 3 is processing of attribute data that may be commonly specified for all drawing primitives. The processor 1 calculates the drawing position and the drawing position and supplies the calculation result to the attribute processing hardware 3. However, the attribute instruction data may be written to the attribute register 4 by the processor 1. That is,
Only the portion not involved in the attribute processing is extracted from the program for drawing the frame buffer and supplied to the processor 1, and the drawing position and the drawing position can be simply calculated.

The operation of the frame buffer drawing device having the above configuration is as follows. The processor 1, which has received the necessary data from the host processor (not shown), calculates the drawing position and the drawing color S and supplies the drawing position and the drawing color S to the attribute processing hardware 3 through the address bus and the data bus. Further, the attribute designation data is written in the attribute register 4 by a host processor (not shown).

In the above attribute processing hardware 3,
The attribute instruction data is read from the attribute register 4, the drawing color S supplied from the processor 1 is subjected to the corresponding attribute processing, and drawing is performed on the frame buffer 2 based on the address received from the processor 1. Therefore, the processor 1 does not need to perform the attribute processing, and the processing load can be greatly reduced, so that the drawing speed for the frame buffer 2 can be increased to the drawing speed when the attribute processing is not instructed at all.

More specifically, for example, when the attribute mask 4 and the attribute instruction data for instructing the raster operation op are stored in the attribute register 4, the attribute processing hardware receiving the address and the drawing color S from the processor 1 is described. The wear 3 reads the value d from the frame buffer 2 based on the address, performs attribute processing, and writes the value d ′ {= (m
op S) | (˜mop d)} is obtained, and the obtained value d ′
Is written in the frame buffer 2 based on the above address.

Further, the program to be executed by the processor 1 can be easily dealt with because it is sufficient to extract the part not involved in the attribute processing.

[0014]

As described above, according to the first aspect of the present invention, the processing load of the data processing means can be greatly reduced regardless of the type of the drawing primitive, and high speed drawing can be achieved. Since the drawing speed is the same as the drawing speed of the drawing primitive when there is no processing, and the drawing speed of the drawing primitive is the same regardless of the presence or absence of attribute processing, the balance of the system including the frame buffer drawing device can be improved. There is a unique effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a frame buffer drawing device of the present invention.

FIG. 2 is a block diagram showing a conventional example of a frame buffer drawing device.

FIG. 3 is a block diagram showing a conventional example of a frame buffer drawing device.

[Explanation of symbols]

1 processor 2 frame buffer 3 attribute processing hardware

Claims (1)

[Claims] 1. A frame buffer drawing apparatus for drawing a figure in a frame buffer (2) by performing necessary processing based on attribute data and drawn figure data designated by an application program, and for all kinds of drawn figures Includes attribute data processing means (3) for processing attribute data that may be commonly designated, and data processing means (1) for processing data that is not processed by the attribute data processing means (3). Characteristic frame buffer drawing device.