JP2003140628A - Information processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means which can display high-resolution bit-map data and displays the reduced bit-map data with small influence of the performance of a processor. SOLUTION: A rendernig processor has a rendernig frame memory which has reduced resolution in a main memory, information needed to write reduced characters to the frame memory, character data, and a means which converts the resolution of external character data according to those information and data to the resolution of the frame memory and writes the data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing portion of an information processing device.

[0002]

2. Description of the Related Art In an information terminal such as a personal computer, in order to display character characters, figures, etc., the object to be displayed is stored as a bitmap data for each pixel in a display data memory, and a CRT or the like is stored. The bit map data is read out in synchronization with the display refresh period of (1) to perform a desired display. But,
In recent years, the resolution of this display data has increased, the display refresh period has also become short, and the data bandwidth required to be read per unit time is increasing. JP-A-6-21
In 5124, a table of enlarged and reduced data patterns is prepared for the patterns of these bitmap data, and this table is used at the time of display reading to perform enlarged display by reading the original data. Reducing.

In the information terminal equipment, a main memory for a processor and a display memory are integrated as shown in Japanese Patent Laid-Open No. 8-76733, and display is performed without using an expensive display memory. Some are configured to do so. In this case, if the data bandwidth used for reading the display data is too large, the data bandwidth that can be used by the processor is limited, which becomes a factor of suppressing the processing performance.

The display method using such a bitmap is used not only in the information processing apparatus but also in a television receiver or the like. In these, broadcasting to which subtitle data has been added for viewing assistance is beginning to be performed, a bitmap is used for this, and a television receiver or a receiving device is required to have a function of processing this.

[0005]

When a function for processing additional data such as subtitle data is added to a conventional television receiver or receiver, it is usually performed by adding new parts, but other image creation processing, etc. When processing is performed by software or the like on the processor, only the addition of software for displaying subtitles can be performed without adding hardware such as parts. Also, the display memory itself can create and use an area in the main memory used by the processor. However, in this case, even if the processing and writing of subtitles can be performed by utilizing the processing idle time of the processor, a certain data bandwidth is required for display and reading, and high resolution bitmap data is displayed. In this case, the performance of the processor is suppressed, and there is a high possibility that desired processing will be impossible. The present invention provides means for displaying the high-resolution bitmap data and reducing the bitmap data so that the performance of the processor is less affected.

[0006]

In order to solve this problem, the present invention uses the following means. A drawing processor, a main memory used by the drawing processor, and a display data transfer unit for transferring display data from the drawing processor to the display device, and a device having a display signal generation unit for creating a signal to be used in the display device, have a reduced resolution on the main memory. Frame memory for drawing having, information necessary to write a reduced character to the frame memory, character data, and these information, the resolution of the character data that comes from outside based on the data is converted to the resolution of the frame memory, Prepare writing means.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The present invention and its operation will be described below with reference to FIGS.

FIG. 1 is a hardware configuration diagram of this embodiment. In the figure, 101 is a drawing processor, 102 is a drawing processor memory used by the 101 drawing processor, 1
03 is a character string data signal, 104 is a display mode signal, 1
Reference numeral 05 is a display signal generation unit, and reference numeral 106 is a display.
The drawing processor 101 receives and writes the drawing processor memory 102, performs basic logical operation, and receives the drawing character string signal 103 and the display mode signal input 104.
It has an input / output function such as display signal generation data output used by the display signal generation unit 105. This drawing processor is 1
Using the drawing program placed on the memory of 02,
Display data is generated from the character string data signal 103 and the display mode signal 104, and the display data is written to the drawing frame memory also defined on 102. Details are shown in FIG. 2 below. Also, the display data is read out in synchronization with the display signal generation unit 105 and transferred to the same unit. The display signal generation unit that receives this receives 10
A signal used for display on the display of No. 6 is generated and transmitted to the display. 1 for 106 displays
Display is performed using the signal generated in 05.

FIG. 2 shows a memory map of the drawing processor memory 102. In the figure, 201 is a character drawing program, 202 is a character display parameter table, 203 is a character data table, and 204 is a drawing frame memory. A character drawing program 201 is a program that is interpreted and executed by the drawing processor 101. Based on the display mode of 104, the display parameter table and character data table of 202 are used in this program, and 10
The character string data 3 is interpreted and written in the drawing frame memory 204. A character display parameter table 202 can select a character display parameter depending on the state of the display mode signal 104. This parameter contains
The ratio between the resolution originally assumed in each display mode and the resolution currently set in the frame memory of 204, the character size after conversion from the resolution of each display mode to the resolution of the frame memory, and used The size of character data is described. The character data table 203 has actual character data, and can be uniquely selected according to the character code and the character size. 204
Is a frame memory for drawing, in which display data generated by the program of 201 is stored. It is read from this memory in synchronization with the display timing generated by the display signal generation unit 105 and transferred to the same unit.

FIG. 3 is a detailed view of the character display parameter table 202. In the figure, 201 is a display mode tag, 30
2 is a horizontal scale, 303 is a vertical scale, 304 is an original character size tag, 305 is a character data size, 306 is a character display size, and 307 is a next original character size tag. The display mode tag 301 is compared with the value of the display mode signal 104 and the matching tag parameters are used for subsequent rendering. Reference numerals 302 and 303 indicate the ratios of the resolution originally assumed in each display mode and the resolution currently set in the frame memory of 204 for each of the horizontal and vertical directions. For example, in the case of the display mode 2, what was originally estimated in the display mode is the horizontal 96
0, vertical 540 resolution and frame memory horizontal 72
It shows the case of conversion to the resolution of 0, vertical 360,
The ratio is 3/4 horizontal and 2/3 vertical, so 302 is a,
b = 3,4, 303 becomes a, b = 2,3. When the character display position coordinates are given by the character string data 103, the corresponding coordinates on the frame memory are obtained using 302 and 303. 304 is the original character size tag,
It is compared with the character size defined in the character string data 103.

When they match, the corresponding character data size of 305 and the corresponding character display size of 306 are selected and used for character display. Therefore, the set of 304, 305, and 306 is required for the number of sizes that can be designated by the character string data signal of 103. For example, size 36x36,30x30,24x2
If 5 types of 4,20x20 and 16x16 are defined, it is necessary to define 5 sets. The character data size of 305 is 20
4 shows the character size actually written in the drawing frame memory 4. This value does not exceed the character display size of 306,
In addition, the size needs to be the maximum size existing in the character data table 203. This value is used to select data from the 203 character data table. A character display size 306 indicates the size of the character area corresponding to the assumed character size. The character drawing program 201 treats this size as the actual character size and uses it for writing to the drawing frame buffer.

FIG. 4 shows the character drawing program 201.
The flowchart of the part regarding the change of a display mode is shown. In this embodiment, this part is shown as a resident program. In 401, it is confirmed whether the display mode of 104 is changed, and it waits until it is changed. When the display mode is changed, the process proceeds to 402, the 301 display mode tag in the display parameter table 202 is compared with the current display mode, and the matching parameter is selected.
Return to the standby mode of 01.

FIG. 5 shows the character drawing program 201.
The flowchart of the part regarding character drawing is shown.
This part is activated when the character string data 103 arrives at the drawing processor 101. First, in 501, the character coordinate data set in the character string data is taken out, and the character display position assumed by the character string is calculated. Next, at 502, the horizontal scale of 302 and the vertical scale of 303 are used to obtain the character position coordinates for the 204 frame memory. Next, in 503, the area indicated by the character display size of 306 is filled with the background color to the character position acquired in 502. As a result, the character has the size of the character display size.

Next, in 504, corresponding character data is acquired from the character code to be displayed and the character data size of 305, which is acquired from the character string data of 103. In 505 of this data, a character is drawn in the area filled in with the character data acquired. This completes the drawing of one character, and in 506 it is judged whether the character string data has ended. If it has ended, this part ends, and if there is still character string data, the next data is for coordinate change. If it is the data for coordinate change,
The processing from 501 is started, and in the case of continuous character data, the processing is started from the character drawing of 503.

FIG. 6 shows a display example of a character string. In this display example, the display mode tag of the character display parameter table in Figure 3 is 2
It is an example of the case. A display area size 601 is assumed by the character string and has a resolution of horizontal 960 and vertical 540. On the other hand, reference numeral 602 denotes an actual display area on the frame memory, which has a resolution of horizontal 720 and vertical 360. 603 is a display assumed by the character string, and the first character of 604 is (100,100)
It is assumed that 3 characters from 1 to 1 character are written one line below. All are 36x36 characters. This is written as a display 605 on the frame memory 602. 604
The coordinates of the first character (100,100) are the coordinates of the first character of 606.
It is converted to (75,66), and the character size of 27x24 is displayed 3 characters from the first character and 1 character under the line. Each character is
It uses 24x24 character data and this is written in a 27x24 area.

[0016]

EFFECTS OF THE INVENTION The present invention configured as described above has the following effects. By reducing and storing the high-resolution bitmap data and displaying it, it becomes possible to operate without reducing other processing performance of the drawing processor.
Further, even if the resolution changes, it is possible to display at a constant display resolution.

[Brief description of drawings]

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

FIG. 2 is a memory map diagram in a memory for a drawing processor according to an embodiment of the present invention.

FIG. 3 is a detailed diagram of a character display parameter table according to the embodiment of this invention.

FIG. 4 is a flowchart of a character drawing routine according to the embodiment of this invention.

FIG. 5 is a detailed flowchart of character drawing according to the embodiment of this invention.

FIG. 6 is an explanatory diagram of conversion display by a character display parameter according to the embodiment of this invention.

[Explanation of symbols]

101: Drawing Processor, 102: Memory for Drawing Processor, 105: Display Signal Generation Unit, 106: Display

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/278 (72) Inventor Atsushi Kawaguchi 1099, Ozenji, Aso-ku, Kawasaki City, Kanagawa Prefecture Hitachi Systems Development Co., Ltd. In-lab (72) Inventor Taku Tashiro 3-16-16 Shinmachi, Ome-shi, Tokyo Hitachi Ltd. Device Development Center (72) Inventor Masao Ishiguro 1099, Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Hitachi Systems Co., Ltd. F-term in development laboratory (reference) 5B069 AA01 AA02 BC02 DC03 5C023 AA02 AA18 CA03 CA05 DA04 DA08 5C076 AA22 BA07 BB45 CB04 5C082 AA01 BA02 BB15 BB22 CA34 CB01 DA53 DA63 DA86 MM02

Claims (3)

[Claims] 1. A character display parameter table having a processor capable of having an external main memory, having a reduced resolution on the main memory, scale information, and parameters of character conversion information to be used. Character data, and a parameter obtained by converting the resolution of the character data that comes from the outside based on these information and the data into the resolution of the frame memory and writing the character display information given from the outside from the display parameter table. An information processing device capable of performing reduced display with. 2. The information processing apparatus has a plurality of character display parameter tables having parameters of the scale information and the character conversion information to be used, and information capable of converting from a plurality of resolutions to the resolution of the frame memory. Processing equipment. 3. An information processing apparatus for displaying characters, wherein character data different from the size designated externally is used by a character display parameter table having parameters of external character display information for scale information and character conversion information to be used. An information processing device capable of operating as if it were.