Method for generating patterns based on outline data

Claim 1

A method for generating character patterns and/or figure patterns using a display memory means for storing character data and/or figure data of 1 bit for each pixel on a screen as information indicating outlines of character and/or figures to be displayed, and reading the stored character data and/or figure data from said display memory means consecutively to generate dot data corresponding to character patterns and/or figure patterns to be displayed on the basis of said character data and/or figure data, said character patterns and/or figure patterns having an upper portion that is contiguous with a lower portion, wherein said character patterns and/or figure patterns do not have the upper portion sloping down to the left and the lower portion sloping down to the right, said method for generating character patterns and/or figure patterns utilizing a line-buffer means containing data relating to pixels on a current scan line as well as on the scan line directly above thereof, said method for generating character patterns and/or figure patterns comprising the steps of: reading character data and/or figure data indicating outlines of characters and/or figures to be displayed, the character and/or figure data corresponding to a current displaying pixel from said display memory means; reading buffer data relating to said scan line and line directly above thereof from said line-buffer means; generating said dot data by performing logical computation on said character data and/or figure data corresponding to current pixel and line-buffer data relating to said scan lines; and writing said dot data to said line-buffer.

Claim 2

A method for generating character patterns and/or figure patterns using a display memory means for storing character data and/or figure data of 1 bit for each pixel on a screen as information indicating outlines of character and/or figures to be displayed, and reading the stored character data and/or figure data from said display memory means consecutively to generate dot data corresponding to character patterns and/or figure patterns to be displayed on the basis of said character data and/or figure data, said character patterns and/or figure patterns having an upper portion that is contiguous with a lower portion, wherein said character patterns and/or figure patterns do not have the upper portion sloping down to the left and the lower portion sloping down to the right, said method for generating character patterns and/or figure patterns utilizing a line-buffer means containing data relating to pixels on a current scan line as well as on the scan line directly above thereof, said method for generating character patterns and/or figure patterns comprising the steps of: reading character data and/or figure data indicating outlines of characters and/or figures to be displayed, the character and/or figure data corresponding to a current displaying pixel from said display memory means; reading buffer data relating to said scan line and line directly above thereof from said line-buffer means; generating said dot data by performing logical computation on said character data and/or figure data corresponding to current pixel and line-buffer data relating to said scan lines; and writing said dot data to said line-buffer.

Claim 3

A method for generating character patterns and/or figure patterns using a display memory means containing character data and/or figure data of 1 bit for each pixel on a screen as information indicating outlines of character and/or figures to be displayed, and reading stored character data and/or figure data from said display memory means consecutively to generate dot data displayed on the basis of said character data and/or figure data, said character patterns and/or figure patterns having a contiguous upper portion and lower portion, wherein said character patterns and/or figure patterns do not have the upper portion sloping down to the left and the lower portion sloping down to the right, said method for generating character patterns and/or figure patterns utilizing a line-buffer means for storing upper buffer data and left buffer data for each pixel on a scan line, a current pixel to be displayed indicative of a relationship between the current pixel to be displayed and on upper adjacent pixel thereof, said current pixel to be displayed indicative of a relationship between said current pixel to be displayed and a left adjacent pixel, said method for generating character patterns and/or figure patterns comprising the steps of: reading character data and/or figure data indicating outlines of characters and/or figures to be displayed, the character and/or figure data corresponding to n-th (n=1 to m) reading n-th dot data of said line-buffer as upper buffer data; reading (n - 1)-th data as left buffer data; generating n-th dot data by performing logical computation on said character data and/or figure data corresponding to said n-th current pixel, said upper buffer data, and said left buffer data; displaying said current pixel on the basis of said n-th dot data; and updating said line-buffer by writing said n-th dot data to said line-buffer as n-th data.

Claim 4

A method for generating character patterns and/or figure patterns using a display memory means containing character data and/or figure data of 1 bit for each pixel on a screen as information indicating outlines of character and/or figures to be displayed, and reading stored character data and/or figure data from said display memory means consecutively to generate dot data displayed on the basis of said character data and/or figure data, said character patterns and/or figure patterns having a contiguous upper portion and lower portion, wherein said character patterns and/or figure patterns do not have the upper portion sloping down to the left and the lower portion sloping down to the right, said method for generating character patterns and/or figure patterns utilizing a line-buffer means for storing upper buffer data and left buffer data for each pixel on a scan line, a current pixel to be displayed indicative of a relationship between the current pixel to be displayed and on upper adjacent pixel thereof, said current pixel to be displayed indicative of a relationship between said current pixel to be displayed and a left adjacent pixel, said method for generating character patterns and/or figure patterns comprising the steps of: reading character data and/or figure data indicating outlines of characters and/or figures to be displayed, the character and/or figure data corresponding to n-th (n=1 to m) reading n-th dot data of said line-buffer as upper buffer data; reading (n - 1)-th data as left buffer data; generating n-th dot data by performing logical computation on said character data and/or figure data corresponding to said n-th current pixel, said upper buffer data, and said left buffer data; displaying said current pixel on the basis of said n-th dot data; and updating said line-buffer by writing said n-th dot data to said line-buffer as n-th data.