JPH01100590A - Display control system - Google Patents

Abstract

PURPOSE: To increase a display speed by repeating operation for turning pixels existing from the position of an inflection point up to the position of a succeeding inflection point to 'black' or 'white' and displaying an OR output between data obtained by repeating the operation and output data from a frame memory storing only outlines. CONSTITUTION: A display control part 10 simultaneously reads out the contents of two frame memories 8, 9 and data read out from the frame memory storing outlines are displayed as they are. Data read out from the frame memory storing only information expressing the positions of inflection points are supplied through an inflection point storing mechanism 101, pixels existing from an initial inflection point up to a succeeding inflection point are turned to 'black' or 'white' and the OR data of values generated by repeating the inversion of data in each inflextion point are displayed on a CRT display 11. Consequently processing time for executing area filling processing for the inside of an outline and transferring an area-filled character pattern to the frame memories 8, 9 can be omitted and outline characters can be quickly displayed.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a display control method in a device that reads a character font of outline characters (vector characters) and reads and displays display data formed on a frame memory using a raster scan method. With the aim of increasing the display speed when displaying characters by filling them out, a device that uses the raster scan method to read data from a frame memory and display it is equipped with 2 meters of frame memory for the above display, and One frame memory is provided with means for drawing only the outline of the data to be displayed, and the other frame memory is provided with means for drawing only the bending points of the data to be displayed, and the two sets of frames are While simultaneously reading display data from the memory, for data read from the frame memory in which only the bending point of the display data is drawn, pixels from the first bending point position to the next bending point position are "black". , or "white" and the pixels from the position of the next bending point to the position of the next bending point are "
The configuration is configured so that the logical sum output of this data and the output data from the frame memory in which only the outline is drawn is transferred to the display device and displayed. .

[Industrial application field]

The present invention relates to a display control method in an apparatus that reads out a character font of outline characters (vector characters) and reads out and displays display data formed on a frame memory using a raster scan method.

With the recent spread of word processors and the rise of desktop publishing, there is a demand for higher quality text and richer expressiveness.In order to meet these demands, it is necessary to increase the resolution of the device. be.

However, in this case, problems arise in that the dot size of the characters increases, the amount of data increases, and it takes time to display, which significantly reduces display performance.

As a countermeasure to this problem, an outline character method has been adopted in order to reduce the amount of data.

The outline character holds the outline as vector data, and the device that receives it forms the character by filling in the inside of the outline.

However, the filling process and the transfer of one created character data to a predetermined position in the frame memory, etc., take time, and the required performance is lower than that of full-dot characters, especially in cathode ray tube (CRT) displays. (Display speed performance) has been a problem.

Against this technical background, there has been a need for a display control system that takes advantage of the small amount of data of outline characters while also being able to display them at high speed.

[Prior art and problems to be solved by the invention] FIG. 3 is a diagram illustrating a conventional display control system.

First, in the initialization process when the word processor, desktop publishing, etc. (coordinate group data of starting points and ending points of a plurality of vectors) are loaded into a specific area of the memory (MM) 6 of the display control processor (PCP) 5.

Next, the text created using a word processor (not shown) is saved on a floppy disk (FD).
12 through the same memory (MM
) 6 is stored in another area.

Here, the pit maso processor (BMP) 7 reads character fonts corresponding to the individual character codes forming the text sentence from the memory (MM) 6, and reads them from the high-speed drawing memory (GM) 7a. Then, by means of well-known digital differential analysis (ODA), a vector (contour line) of the corresponding character is generated, and the spaces between the contour lines are filled in, and the resulting data is stored in a frame memory (PM) 8'
Write in sequence.

On the other hand, in the display control unit (CRTC) 10, the CRTC
Horizontal and vertical scanning timing signals for the T-display 11 are generated to scan the frame memory (FM) 8'' using a known raster scan method, and the written display data is read out and displayed on the display screen.

Therefore, in the conventional method, after generating the outline of an outline character from the character font read from the memory (MM) 6, characters are formed by filling in the inside of the outline. The formed letters,
Drawing memory (GM) 7a to frame memory (FM)
There is a problem in that it takes time to transfer the characters to the predetermined position of 8', and the required display speed cannot be obtained sufficiently compared to the display of full-throated characters. In particular, C
When the resolution of the RT display 11 increases and the dont size of displayed characters increases, there is a problem in that the filling process takes time in proportion to the square of the size.

In view of the above-mentioned drawbacks of the conventional art, the present invention reads the character strings generated by reading out the character font of outline characters and forms the display data on the frame memory using a raster scan method, and displays the data on the display screen of a CRT display. The purpose of this invention is to provide a display control method that increases speed.

[Means for solving problems]

The above problems are solved by a display control method having the following configuration.

In a device that reads data from a frame memory and displays it using the raster scan method, two sets of frame memories for the above display are prepared, and only the outline of the data to be displayed is drawn in one of the frame memories. However, the other frame memory is provided with a means for drawing only the bending point of the data to be displayed, and while reading the display data from the two sets of frame memories simultaneously, only the bending point of the display data is drawn. For data read from a frame memory that is The pixels up to the point position are repeatedly made black or white, and the OR output of this data and the output data from the frame memory in which only the outline is drawn is transferred to the display device. Configure it so that it is displayed.

[Effect]

That is, according to the present invention, in a device that reads out a character font of outline characters (vector characters) and reads out and displays display data formed on a frame memory using a raster scan method, two frame memories for display are prepared. , an outline is drawn on the - side based on the coordinate data group specified by the character font of the outline character = 7-, and the position of the bending point of the outline of the character is drawn in the other frame memory. Draw information only.

Then, in the display control unit of the device, the contents of the two frame memories are simultaneously read out, and the read data of the frame memory in which the outline is drawn is the value of the side, and the frame memory in which only the information representing the position of the bending point is drawn is The read data of the memory is repeatedly set as 'black' or 'white' for pixels from the first bending point to the next bending point, and as the inverted data until the next bending point, through the bending point storage mechanism. Since the data obtained by ORing the values generated by the above is output to the CRT display and displayed, the time required to fill in the outline and to transfer the filled character pattern to the frame memory is omitted. This has the effect of displaying outline characters at high speed.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

18= Fig. 1 is a block diagram showing an embodiment of the present invention, and Fig. 2 is a diagram illustrating a drawing method according to the present invention. (b) shows an example of a bending point storage mechanism for read data of frame memory B, and the frame memories A, B (FMA, B) 8.9 in FIG. The bending point storage mechanism 101, which fills in the inside of the contour line by retaining the bending point data read from the FMB 9 until the next bending point is detected, is a necessary means for carrying out the present invention. be. Note that the same reference numerals indicate the same objects throughout the figures.

Hereinafter, the display control method according to the present invention will be explained with reference to FIGS. 1 and 2.

Even if the present invention is implemented, the magnetic disk device 4. Character fonts from floppy disk (FD) 12.

Memory (MM) for control processor that displays text sentences 6
The procedure for setting the BMP processor is omitted here as it is not particularly different from the conventional method.
) 7 and the display control unit (CRTC) 10 will be mainly explained.

First, in the present invention, a bitmap processor (B
MP) 7 is memory for display control processor (MM) 6
When recognizing the character code for a specific character in a text sentence, reading the character font for that character, and writing display data to frame memories A, B (PM8, B) 8.9, frame memory A (FMA) 8. For , only the outline formed from the character font is drawn, and for frame memory B (FMB) 9,
Only the bending point data of the contour line data is drawn.

FIG. 2(a) shows the frame memories A and B (FMA
, B) shows a drawing example for 8.9, and as shown in the frame memory A (FMA) 8,
For example, the outline data of the character rAJ is drawn, but only the bending point (change point) data of the outline is drawn in the frame memory B (FMB) 9.

Here, as shown in "Notes", the ○ mark indicates a "1" pixel, and the others indicate "0", that is, "black" pixels, but it goes without saying that the reverse may be used. There is no such thing.

In the display control unit (CRTC) 10, the two frame memories A are scanned using a raster scan method.

B (FM^, B) Read 8.9 at the same time, (b)
A specific example of this is shown in the figure and is input to the bending point storage mechanism 101.

In the bending point storage mechanism 101, a frame memory A
(FMA) The output from 8 is its side logical sum circuit (OR)
101a, frame memory B (FMB
) 9 is input as an enable signal (EN) to a bending point memory lunch (FF) 101b, and once it is stored as ``1'' or 0''. Then, it is held until the next bending point data is input, and when that bending point data is input, the above-mentioned inverted data “
The operation of storing 0' or 1' is repeated every time the bending point data is manually input while the horizontal synchronizing signal is 1°, so that it is output to the logical sum circuit (OR) 101a. Therefore, the OR circuit (OR) 101a calculates the logical sum of the data filled in black or white and the outline data between the bending points. By outputting the object, the area between the contour lines is filled in, and the inside of the contour line is filled in instead of being filled in by the bitmap processor (BMP) 7 as in the conventional method. It functions so that display data is output to and displayed on the CRT display 11.

As described above, the present invention provides an apparatus for reading character fonts of outline characters (vector characters) and reading and displaying display data formed on a frame memory using a raster scan method, in which the frame memory is arranged on two sides (A and B).
The outline data of the displayed character is drawn in the frame memory 8, only the bending point data of the outline is drawn in the frame memory B, and the display control unit (CRTC) draws the outline data of the displayed character.
The data in the two frame memories A and B are read simultaneously, and the data in the frame memory is input to the logical sum circuit, and the data in the frame memory B is converted to a logical value ( °engineering °,
or 0') until the next bending point data is input,
When the next bending point data is input, it is input to the OR circuit via the bending point memory lunch that holds the inverted data, and the logical sum of the two is CI? By outputting and displaying on the T-display to fill in between the curved points, it is possible to fill in between the contour lines without performing the filling process on the front edge and drawing in the frame memory. The feature lies in the fact that it is possible to do so.

In this example, we explained the method of displaying on a CRT display, but as another application example, data is read from two frame memories A and B using the raster scan method, and this is converted into a video signal and sent to a laser printer. It goes without saying that by doing so, high-speed printing can be achieved.

〔Effect of the invention〕

As explained above in detail, the display control method of the present invention is a raster scan method, and in a device that reads data from a frame memory and displays it, two sets of frame memories for display are prepared, and one of the display control methods is a raster scan method. One frame memory is provided with a means for drawing only the outline of the data to be displayed, and the other frame memory is provided with means for drawing only the bending points of the data to be displayed, and the display from the two sets of frame memories is provided. When data is simultaneously read out and data is read from the frame memory where only the bending point data is drawn, the pixels from the first bending point position to the next bending point position are set to "black" or white. , repeats the process of setting the pixels from the position of the next bending point to the position of the next bending point as "black" or "white", and outputs this data and the output data from the frame memory in which the above outline is drawn. The output of the logical sum of the characters is transferred to the display device and displayed, so the time required to fill in the outline and to transfer the filled character pattern to the frame memory can be omitted. This has the effect of displaying images at high speed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram illustrating a drawing method according to the present invention. FIG. 3 is a diagram explaining a conventional display control method. It is. In the drawing, 3 is a file adapter (FA). 4 is a magnetic disk device. 5 is a display control processor (PCP). 6 is a memory (MM) for the display control processor, or simply a memory (M14). 7 is Pintomasop Processosa (BMP). 8 is frame memory A (F anal). 8. Frame memory (FM). 9 is frame memory B (FMB). 10 is a display control unit (CI?TC). 101 is an inflection point memory mechanism, 101a is a logical homology In
(OR>. 101b is the bending point memory lunch (FF). 11 is the CI?T display. 12 is the floppy disk (FD). =15- =17- F00, 7C inre*
(r = (I) Tei 1 View of the tree display is poor” Ugagata 2゛Σ↓Garo 4 Ru 6 Hei 3 Ward

Claims (1)

[Claims] In a device that reads data from a frame memory and displays it using a raster scan method, two sets of frame memories for the above-mentioned display are prepared, and one of the frame memories (8) is used for displaying the data. The two sets of frame memories (8, 9) are provided with means for drawing only the outline of the data to be displayed, and the other frame memory (9) is provided with means for drawing only the bending points of the data to be displayed. While simultaneously reading display data from the frame memory (9) in which only the bending point of the display data is drawn, pixels from the first bending point position to the next bending point position are By repeating the process of setting the pixels from the position of the next bending point to 'black' or 'white' and then setting the pixels from the position of the next bending point to 'black' or 'white', only this data and the above contour line are set. A display control method characterized in that a logical OR output with output data from a frame memory (8) in which is drawn is transferred to a display device and displayed.