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Parse and dump GS font glyphs

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This commit is contained in:
David Schmenk 2025-01-10 19:45:03 -08:00
parent a32b82dcd7
commit abbb32de5c
1 changed files with 99 additions and 14 deletions
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113
src/dhgr.tk/utils/gsfonconv.c
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@ -1,19 +1,47 @@
/*
*
* GS font converter
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbit.h>
#define FONT_WIDTH 32
#define FONT_HEIGHT 12
#define GLYPH_FIRST 32
#define GLYPH_LAST 127
#define GLYPH_COUNT (GLYPH_LAST-GLYPH_FIRST+1)
struct gsfont {
uint16_t offsetMacFont;
uint16_t family;
uint16_t style;
uint16_t pointSize;
uint16_t version;
uint16_t extent;
};
struct macfont {
uint16_t fontType;
uint16_t firstChar;
uint16_t lastChar;
uint16_t widMax;
uint16_t kernMax;
uint16_t nDescent;
uint16_t rectWidth;
uint16_t rectHeight;
uint16_t owTLoc;
uint16_t ascent;
uint16_t descent;
uint16_t leading;
uint16_t rowWords;
uint16_t bitImage; // [rowWords * rectHeight] (fonstStrike)
//uint16_t rlocTable; // lastChar - firstChar + 3 : pixel offset of glyph in bitImage
//uint16_t owTable; lastChar - firstChar + 3 : offset/width table
};
/*
* Bit reversals
*/
unsigned char bitReverse[256];
unsigned char clrSwap[256];
unsigned char clrRot[] = {0x00,0x02,0x04,0x06,0x08,0x0A,0x0C,0x0E,
0x01,0x03,0x05,0x07,0x09,0x0B,0x0D,0x0F};
@ -143,12 +171,47 @@ void die(char *str)
fprintf(stderr,"error: %s\n", str);
exit(-1);
}
void dispGlyph(uint8_t *glyphBits, int glyphSpan, int offset, int width, int height)
{
uint32_t rowbits;
int byteOffset, bitShift, bitWidth, i;
byteOffset = offset / 8;
bitShift = offset & 7;
bitWidth = bitShift + width;
while (height--)
{
rowbits = bitReverse[glyphBits[byteOffset]];
if (bitWidth >= 8)
{
rowbits |= bitReverse[glyphBits[byteOffset + 1]] << 8;
if (bitWidth >= 16)
{
rowbits |= bitReverse[glyphBits[byteOffset + 2]] << 16;
if (bitWidth >= 24)
rowbits |= bitReverse[glyphBits[byteOffset + 3]] << 24;
}
}
rowbits >>= bitShift;
for (i = 0; i < width; i++)
{
putchar(rowbits & 1 ? '*' : ' ');
rowbits >>= 1;
}
puts("");
glyphBits += glyphSpan;
}
}
void load_iigs_file(char *filename)
{
FILE *fp;
char *fontdef;
char fontname[64];
int fontdefsize;
int fontdefsize, i;
struct gsfont *gsf;
struct macfont *macf;
int16_t *locTable;
uint16_t *owTable;
if ((fp = fopen(filename, "rb")))
{
@ -157,17 +220,39 @@ void load_iigs_file(char *filename)
fclose(fp);
}
else
die("Unable to open IIGS font file");
die("Unable to opern IIGS font file");
memcpy(&fontname, fontdef + 1, fontdef[0]);
fontname[fontdef[0]] = '\0';
printf("Font name: %s\n", fontname);
gsf = (struct gsfont *)(fontdef + fontdef[0] + 1);
printf("Mac Font offset: %d\n", gsf->offsetMacFont * 2);
macf = (struct macfont *)((char *)gsf + gsf->offsetMacFont * 2);
printf("font type: $%04X\n", macf->fontType);
printf("first char: %d\n", macf->firstChar);
printf("last char: %d\n", macf->lastChar);
printf("rect width: %d\n", macf->rectWidth);
printf("rect height: %d\n", macf->rectHeight);
printf("ascent: %d\n", macf->ascent);
printf("descent: %d\n", macf->descent);
printf("leading: %d\n", macf->leading);
printf("rowWords: %d rowBytes: %d\n", macf->rowWords, macf->rowWords * 2);
locTable = (int16_t *)((char *)&(macf->bitImage) + macf->rectHeight * macf->rowWords * 2);
printf("locTable[0]: $%04X\n", locTable[0]);
owTable = (uint16_t *)((char *)locTable + (macf->lastChar - macf->firstChar + 3) * 2);
printf("owTable[0]: $%04X\n", owTable[0]);
//for (i = macf->firstChar; i <= macf->lastChar; i++)
for (i = ' '; i <= 'Z'; i++)
{
printf("Char[%3d] : pix offset = %3d,%1d, pix width = %2d, Origin/Width = $%04X (%3d, %3d)\n", i, locTable[i] / 8, locTable[i] & 7, locTable[i+1] - locTable[i], owTable[i], owTable[i] >> 8, owTable[i] & 0xFF);
if (owTable[i] != 0xFFFF)
dispGlyph((uint8_t *)&(macf->bitImage), macf->rowWords * 2, locTable[i], locTable[i+1] - locTable[i], macf->rectHeight);
}
}
int main(int argc, char **argv)
{
char *iigs_file, *font_file;
unsigned char *font_buf;
int glyph_width, glyph_height, font_pitch;
unsigned char bitReverse;
int i;
font_file = NULL;
@ -192,16 +277,16 @@ int main(int argc, char **argv)
*/
for (i = 0; i < 256; i++)
{
bitReverse = ((i & 0x01) << 7)
| ((i & 0x02) << 5)
| ((i & 0x04) << 3)
| ((i & 0x08) << 1)
| ((i & 0x10) >> 1)
| ((i & 0x20) >> 3)
| ((i & 0x40) >> 5)
| ((i & 0x80) >> 7);
clrSwap[i] = clrRot[bitReverse & 0x0F]
| (clrRot[bitReverse >> 4] << 4);
bitReverse[i] = ((i & 0x01) << 7)
| ((i & 0x02) << 5)
| ((i & 0x04) << 3)
| ((i & 0x08) << 1)
| ((i & 0x10) >> 1)
| ((i & 0x20) >> 3)
| ((i & 0x40) >> 5)
| ((i & 0x80) >> 7);
clrSwap[i] = clrRot[bitReverse[i] & 0x0F]
| (clrRot[bitReverse[i] >> 4] << 4);
}
/*
* Load IIGS font file header.