JPH0224697A - Image data display system - Google Patents

Abstract

PURPOSE:To enable batch display operation, to reduce a flicker on a CRT screen, and to improve attractiveness by providing a means which decides whether or not raster format image data is indicated to a graphic frame buffer when the image data is displayed. CONSTITUTION:A raster data writing device 3 selects a plane corresponding to a display color in a map memory (MM) 1 according to input data, writes the image data in the selected plane, and sends a display indication when the image data needs to be written in a graphic frame buffer (GFB) 2. Then when not, a non-display indication actuates a GFB write controller 4. Then the device 4 decides the indicated condition and when the display indication is made, GFB writing is performed to display the data on a CRT 5 in a lump. For the purpose, the raster data writing device 3 makes the nondisplay indication for the writing of the image data in planes 1 and 2 in the MM 1 and makes a display indication for the writing of the image data in a plane 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image data display method, and particularly to a method for displaying image data having color content in three primary colors R, G, and B for CRT display.
The present invention relates to an image data display method for displaying an image via a graphic frame buffer having each data.

[Conventional technology]

Conventionally, this type of image data display method often displays images in rask format, in which image data is written in a map memory in units of planes corresponding to each color display, and is then written in a map memory for each plane corresponding to each color display. A method is used in which data is written into a graphic frame buffer consisting of three bitmap-format bitmap-type branes corresponding to the image data, and this graphic frame buffer is read out at the display frame period for display.

[Problem to be solved by the invention]

In the conventional image data display method described above, each plane corresponding to each display color is written to the map memory, and each time it is written and displayed in the graphic frame\buffer, the intermediate state of the color that will not be displayed in the final This has the disadvantage that it is displayed on the CRT every time it is written to the graphics frame buffer, giving an unpleasant impression to the person viewing the screen.

The present invention solves the above-mentioned drawbacks, and by providing a control means for controlling whether or not to write the image data written to the map memory in units of planes to the graphic frame buffer, the colors in the middle of displaying the image data can be changed. This provides a method that allows display on a CRT in the correct display color without being visible.

Note that there may be cases where it is desired to display an intermediate state of display colors on the CRT as a form of image data display, but this can be done by stopping the operation of the above-mentioned control means.

[Means to solve the problem]

The image data display method of the present invention includes a map memory in which a plurality of screen image data corresponding to display colors are written, a graphic frame buffer having R, G, and B data of display contents of a CRT, and a display of the map memory. Raster data writing means writes image data in units of planes corresponding to colors and issues a display instruction when writing of a specific plane is completed, and the raster data writing means writes the image data written into the map memory into the graphic frame buffer. and a graphic frame buffer write control means for controlling whether or not the raster data is written in accordance with a display instruction from the raster data writing means.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 1 shows a map memory (hereinafter referred to as MM) 1 having screen image data divided into multiple planes corresponding to display colors;
a graphics frame buffer (hereinafter referred to as GFB) 2 having R-G-B data of the display content of the CRT;
It is composed of a raster data writing means 3 for writing image data to the MMI, a GFB writing control means 4 for controlling writing of the image data written to the MMI to the GFB 2, and a display device CRT5.

FIG. 2 is a flowchart of the operation of the raster data writing means 3;
The figure is a flowchart of the operation of the GFB write control means 4, and the operation of the present invention will be explained below with reference to FIGS. 2 and 3. The raster data writing means 3 selects a plane corresponding to the display color in the MMI from the input data (step ■),
Writes image data to the plane selected in step (2) (step (2)), issues a display instruction if it is necessary to write image data to GFB2,
If it is not necessary, a non-display instruction is given to the GFB write control means 4, and the GFB write control means 4 is activated (step ■).
. The GFB write control means 4 determines the conditions instructed in step (2) above (step (2)), and if the display instruction is specified, writes the GFB and displays it on the CRT 5 (step (2)).
. If it is instructed to hide in step ■, step ■
Skip.

In order to display the display color on the CRT 5 all at once without displaying the display of image data in the raster data format, in the case of writing image data to plane 1 and plane 2 in the MMI, step in the raster data writing means 3 is required. This is possible by issuing a non-display instruction in step (2) and issuing a display instruction in step (2) when writing image data to the plane 3.

〔Effect of the invention〕

As explained above, the present invention provides a means for determining whether or not to display image data on the GFB when displaying image data in the rask format, so that the display process of the image data in the rask format is not displayed on the CRT. , - It is possible to display the pattern, and it has the effect of eliminating flickering on the Cr(T screen and improving the visibility. Mana) By skipping the step of displaying on GFB, the process of displaying image data can be intentionally displayed. is also possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart of the operation of the raster data writing means of FIG. 1, and FIG. 3 is a flowchart of the operation of the graphic frame buffer writing control means of FIG. 1. This is a flowchart. DESCRIPTION OF SYMBOLS 1... Map memory (MM), 2... Graphic frame buffer (GFB), 3... Raster data writing means, 4... GFB writing control means, 5... Display device.

Claims (1)

[Claims] A map memory in which a plurality of screen image data corresponding to the display colors are written, a graphic frame buffer having R-G-B data of the display contents of the CRT, and a plane unit corresponding to the display color of the map memory. A raster data writing means writes image data and gives a display instruction when writing of a specific plane is completed, and the raster data writing means determines whether or not the image data written to the map memory by the raster data writing means is written to the graphic frame buffer. An image data display method comprising: a graphic frame buffer write control means controlled by a display instruction from a data write means.