mirror of
https://github.com/isometimes/rpi4-osdev
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79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
#include "../include/wgt.h"
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short wgettextwidth (char *string, wgtfont font)
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{
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char asc;
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unsigned short ofs,width;
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short ctr;
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unsigned short totwidth;
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wgtfont orig;
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totwidth = 0;
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for (ctr = 0; ctr < strlen (string); ctr++)
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/* step through all letters */
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{
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asc = string[ctr];
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/* get ascii code of letter to count */
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if ((font == NULL) & (string != NULL))
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/* default font is 8x8 */
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totwidth += 8;
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else
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{
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orig = font; /* start at font pr */
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font += 15; /* skip over header */
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ofs = *(short *)font; /* read integer offset of char table */
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font = orig; /* reset to ptr */
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font += ofs; /* move to offset of char table */
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font += 2*asc;
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/* go to offset in table of ascii code */
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ofs = *(short *)font; /* read integer offset (letter data) */
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font = orig; /* reset to ptr */
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font += ofs; /* move to offset of letter data */
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width = *(short *)font; /* read width and height of letter */
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totwidth += width; /* add the width to the total */
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font = orig;
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}
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}
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return totwidth;
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}
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short wgettextheight (char *string, wgtfont font)
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{
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short asc;
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unsigned short ofs, height;
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short ctr;
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short maxheight;
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wgtfont orig;
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maxheight = 0;
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orig = font;
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if ((font == NULL) & (string != NULL))
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/* all chars in default font are 8x8 */
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maxheight = 8;
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else
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{
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for (ctr = 0; ctr < strlen (string); ctr++)
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{
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asc = string[ctr];
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font += 15; /* header */
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ofs = *(short *)font; /* read integer ofs */
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font = orig; /* reset */
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font += ofs; /* move to ofs */
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font += 2*asc; /* go to ofs of data */
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ofs = *(short *)font; /* read integer ofs */
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font = orig; /* reset */
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font += ofs; /* move to ofs */
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font += 2; /* skip width */
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height = *(short *)font;
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if (height > maxheight) /* return the maximum letter height */
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maxheight = height;
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font = orig;
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}
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}
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return maxheight;
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}
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