/* Copyright (c) Mark J. Kilgard, 1997. */

/* This program is freely distributable without licensing fees and is

provided without guarantee or warrantee expressed or implied. This

program is -not- in the public domain. */

/* X compile line: cc -o gentexfont gentexfont.c -lX11 */

/* 2000-10-01: Stripped down the original code to get a simple bitmap C-code generator */

/* for use with the VDR project (see http://www.cadsoft.de/vdr) */

/* Renamed the file 'genfontfile.c' since it no longer generates 'tex' data */

/* Klaus Schmidinger ([email protected]) */

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include <X11/Xlib.h>

#include <X11/Xutil.h>

#include <math.h>

typedef struct {

unsigned short c; /* Potentially support 16-bit glyphs. */

unsigned char width;

unsigned char height;

signed char xoffset;

signed char yoffset;

signed char advance;

char dummy; /* Space holder for alignment reasons. */

short x;

short y;

} TexGlyphInfo;

typedef struct {

short width;

short height;

short xoffset;

short yoffset;

short advance;

unsigned char *bitmap;

} PerGlyphInfo, *PerGlyphInfoPtr;

typedef struct {

int min_char;

int max_char;

int max_ascent;

int max_descent;

PerGlyphInfo glyph[1];

} FontInfo, *FontInfoPtr;

Display *dpy;

FontInfoPtr fontinfo;

/* #define REPORT_GLYPHS */

#ifdef REPORT_GLYPHS

#define DEBUG_GLYPH4(msg,a,b,c,d) printf(msg,a,b,c,d)

#define DEBUG_GLYPH(msg) printf(msg)

#else

#define DEBUG_GLYPH4(msg,a,b,c,d) { /* nothing */ }

#define DEBUG_GLYPH(msg) { /* nothing */ }

#endif

#define MAX_GLYPHS_PER_GRAB 512 /* this is big enough for 2^9 glyph

character sets */

FontInfoPtr

SuckGlyphsFromServer(Display * dpy, Font font)

{

Pixmap offscreen;

XFontStruct *fontinfo;

XImage *image;

GC xgc;

XGCValues values;

int numchars;

int width, height, pixwidth;

int i, j;

XCharStruct *charinfo;

XChar2b character;

unsigned char *bitmapData;

int x, y;

int spanLength;

int charWidth, charHeight, maxSpanLength;

int grabList[MAX_GLYPHS_PER_GRAB];

int glyphsPerGrab = MAX_GLYPHS_PER_GRAB;

int numToGrab, thisglyph;

FontInfoPtr myfontinfo;

fontinfo = XQueryFont(dpy, font);

if (!fontinfo)

return NULL;

numchars = fontinfo->max_char_or_byte2 - fontinfo->min_char_or_byte2 1;

if (numchars < 1)

return NULL;

myfontinfo = (FontInfoPtr) malloc(sizeof(FontInfo) (numchars - 1) * sizeof(PerGlyphInfo));

if (!myfontinfo)

return NULL;

myfontinfo->min_char = fontinfo->min_char_or_byte2;

myfontinfo->max_char = fontinfo->max_char_or_byte2;

myfontinfo->max_ascent = fontinfo->max_bounds.ascent;

myfontinfo->max_descent = fontinfo->max_bounds.descent;

width = fontinfo->max_bounds.rbearing - fontinfo->min_bounds.lbearing;

height = fontinfo->max_bounds.ascent fontinfo->max_bounds.descent;

maxSpanLength = (width 7) / 8;

/* Be careful determining the width of the pixmap; the X protocol allows

pixmaps of width 2^16-1 (unsigned short size) but drawing coordinates

max out at 2^15-1 (signed short size). If the width is too large, we

need to limit the glyphs per grab. */

if ((glyphsPerGrab * 8 * maxSpanLength) >= (1 << 15)) {

glyphsPerGrab = (1 << 15) / (8 * maxSpanLength);

}

pixwidth = glyphsPerGrab * 8 * maxSpanLength;

offscreen = XCreatePixmap(dpy, RootWindow(dpy, DefaultScreen(dpy)),

pixwidth, height, 1);

values.font = font;

values.background = 0;

values.foreground = 0;

xgc = XCreateGC(dpy, offscreen, GCFont | GCBackground | GCForeground, &values);

XFillRectangle(dpy, offscreen, xgc, 0, 0, 8 * maxSpanLength * glyphsPerGrab, height);

XSetForeground(dpy, xgc, 1);

numToGrab = 0;

if (fontinfo->per_char == NULL) {

charinfo = &(fontinfo->min_bounds);

charWidth = charinfo->rbearing - charinfo->lbearing;

charHeight = charinfo->ascent charinfo->descent;

spanLength = (charWidth 7) / 8;

}

for (i = 0; i < numchars; i ) {

if (fontinfo->per_char != NULL) {

charinfo = &(fontinfo->per_char[i]);

charWidth = charinfo->rbearing - charinfo->lbearing;

charHeight = charinfo->ascent charinfo->descent;

if (charWidth == 0 || charHeight == 0) {

/* Still must move raster pos even if empty character */

myfontinfo->glyph[i].width = 0;

myfontinfo->glyph[i].height = 0;

myfontinfo->glyph[i].xoffset = 0;

myfontinfo->glyph[i].yoffset = 0;

myfontinfo->glyph[i].advance = charinfo->width;

myfontinfo->glyph[i].bitmap = NULL;

goto PossiblyDoGrab;

}

}

grabList[numToGrab] = i;

/* XXX is this right for large fonts? */

character.byte2 = (i fontinfo->min_char_or_byte2) & 255;

character.byte1 = (i fontinfo->min_char_or_byte2) >> 8;

/* XXX we could use XDrawImageString16 which would also paint the backing

rectangle but X server bugs in some scalable font rasterizers makes it

more effective to do XFillRectangles to clear the pixmap and

XDrawImage16 for the text. */

XDrawString16(dpy, offscreen, xgc,

-charinfo->lbearing 8 * maxSpanLength * numToGrab,

charinfo->ascent, &character, 1);

numToGrab ;

PossiblyDoGrab:

if (numToGrab >= glyphsPerGrab || i == numchars - 1) {

image = XGetImage(dpy, offscreen,

0, 0, pixwidth, height, 1, XYPixmap);

for (j = 0; j < numToGrab; j ) {

thisglyph = grabList[j];

if (fontinfo->per_char != NULL) {

charinfo = &(fontinfo->per_char[thisglyph]);

charWidth = charinfo->rbearing - charinfo->lbearing;

charHeight = charinfo->ascent charinfo->descent;

spanLength = (charWidth 7) / 8;

}

bitmapData = (unsigned char *)calloc(height * spanLength, sizeof(char));

if (!bitmapData)

goto FreeFontAndReturn;

DEBUG_GLYPH4("index %d, glyph %d (%d by %d)\n",

j, thisglyph fontinfo->min_char_or_byte2, charWidth, charHeight);

for (y = 0; y < charHeight; y ) {

for (x = 0; x < charWidth; x ) {

/* XXX The algorithm used to suck across the font ensures that

each glyph begins on a byte boundary. In theory this would

make it convienent to copy the glyph into a byte oriented

bitmap. We actually use the XGetPixel function to extract

each pixel from the image which is not that efficient. We

could either do tighter packing in the pixmap or more

efficient extraction from the image. Oh well. */

if (XGetPixel(image, j * maxSpanLength * 8 x, charHeight - 1 - y)) {

DEBUG_GLYPH("x");

bitmapData[y * spanLength x / 8] |= (1 << (x & 7));

} else {

DEBUG_GLYPH(" ");

}

}

DEBUG_GLYPH("\n");

}

myfontinfo->glyph[thisglyph].width = charWidth;

myfontinfo->glyph[thisglyph].height = charHeight;

myfontinfo->glyph[thisglyph].xoffset = charinfo->lbearing;

myfontinfo->glyph[thisglyph].yoffset = -charinfo->descent;

myfontinfo->glyph[thisglyph].advance = charinfo->width;

myfontinfo->glyph[thisglyph].bitmap = bitmapData;

}

XDestroyImage(image);

numToGrab = 0;

/* do we need to clear the offscreen pixmap to get more? */

if (i < numchars - 1) {

XSetForeground(dpy, xgc, 0);

XFillRectangle(dpy, offscreen, xgc, 0, 0, 8 * maxSpanLength * glyphsPerGrab, height);

XSetForeground(dpy, xgc, 1);

}

}

}

XFreeGC(dpy, xgc);

XFreePixmap(dpy, offscreen);

return myfontinfo;

FreeFontAndReturn:

XDestroyImage(image);

XFreeGC(dpy, xgc);

XFreePixmap(dpy, offscreen);

for (j = i - 1; j >= 0; j--) {

if (myfontinfo->glyph[j].bitmap)

free(myfontinfo->glyph[j].bitmap);

}

free(myfontinfo);

return NULL;

}

void

printGlyph(FontInfoPtr font, int c)

{

PerGlyphInfoPtr glyph;

unsigned char *bitmapData;

int width, height, spanLength;

int x, y, l;

char buf[1000], *b;

if (c < font->min_char || c > font->max_char) {

fprintf(stderr, "out of range glyph\n");

exit(1);

}

glyph = &font->glyph[c - font->min_char];

bitmapData = glyph->bitmap;

width = glyph->width;

spanLength = (width 7) / 8;

height = glyph->height;

printf(" { // %d\n", c);

printf(" %d, %d,\n", glyph->advance, font->max_ascent font->max_descent);

for (y = 0; y < font->max_ascent - glyph->yoffset - height; y ) {

printf(" 0xX, // ", 0);

for (x = 0; x < glyph->xoffset width || x < glyph->advance; x )

putchar('.');

putchar('\n');

}

for (y = height; y-- > 0;) {

l = 0;

b = buf;

for (x = 0; x < glyph->xoffset; x )

*b = '.';

if (bitmapData) {

for (x = 0; x < width; x ) {

if (bitmapData[y * spanLength x / 8] & (1 << (x & 7))) {

*b = '*';

l |= 1;

}

else

*b = '.';

l <<= 1;

}

for (x = 0; x < glyph->advance - width - glyph->xoffset; x ) {

*b = '.';

l <<= 1;

}

}

*b = 0;

printf(" 0xX, // %s\n", l, buf);

}

for (y = 0; y < font->max_descent glyph->yoffset; y ) {

printf(" 0xX, // ", 0);

for (x = 0; x < glyph->xoffset width || x < glyph->advance; x )

putchar('.');

putchar('\n');

}

printf(" },\n");

}

void

getMetric(FontInfoPtr font, int c, TexGlyphInfo * tgi)

{

PerGlyphInfoPtr glyph;

unsigned char *bitmapData;

tgi->c = c;

if (c < font->min_char || c > font->max_char) {

tgi->width = 0;

tgi->height = 0;

tgi->xoffset = 0;

tgi->yoffset = 0;

tgi->dummy = 0;

tgi->advance = 0;

return;

}

glyph = &font->glyph[c - font->min_char];

bitmapData = glyph->bitmap;

if (bitmapData) {

tgi->width = glyph->width;

tgi->height = glyph->height;

tgi->xoffset = glyph->xoffset;

tgi->yoffset = glyph->yoffset;

} else {

tgi->width = 0;

tgi->height = 0;

tgi->xoffset = 0;

tgi->yoffset = 0;

}

tgi->dummy = 0;

tgi->advance = glyph->advance;

}

int

main(int argc, char *argv[])

{

int c;

TexGlyphInfo tgi;

int usageError = 0;

char *varname, *fontname;

XFontStruct *xfont;

int i;

if (argc == 3) {

varname = argv[1];

fontname = argv[2];

}

else

usageError = 1;

if (usageError) {

fprintf(stderr, "\n");

fprintf(stderr, "usage: genfontfile variable_name X_font_name\n");

fprintf(stderr, "\n");

exit(1);

}

dpy = XOpenDisplay(NULL);

if (!dpy) {

fprintf(stderr, "could not open display\n");

exit(1);

}

/* find an OpenGL-capable RGB visual with depth buffer */

xfont = XLoadQueryFont(dpy, fontname);

if (!xfont) {

fprintf(stderr, "could not get load X font: %s\n", fontname);

exit(1);

}

fontinfo = SuckGlyphsFromServer(dpy, xfont->fid);

if (!fontinfo) {

fprintf(stderr, "could not get font glyphs\n");

exit(1);

}

printf("%s[][%d] = {\n", varname, fontinfo->max_ascent fontinfo->max_descent 2);

for (c = 32; c < 256; c ) {

getMetric(fontinfo, c, &tgi);

printGlyph(fontinfo, c);

}

printf(" };\n");

return 0;

}