/* Copyright (c) Mark J. Kilgard, 1994. */ /* 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. */ /* capturexfont.c connects to an X server and downloads a bitmap font from which a C source file is generated, encoding the font for GLUT's use. Example usage: capturexfont.c 9x15 glutBitmap9By15 > glut_9x15.c */ #ifdef __VMS #include <GL/vms_x_fix.h> #endif #include <stdio.h> #include <stdlib.h> #include <string.h> #include <ctype.h> #include <GL/gl.h> #include <X11/Xlib.h> #include <X11/Xutil.h> #define MAX_GLYPHS_PER_GRAB 512 /* This is big enough for 2^9 glyph character sets */ static void outputChar(int num, int width, int height, int xoff, int yoff, int advance, int data) { if (width == 0 || height == 0) { printf("#ifdef _WIN32\n"); printf("/* XXX Work around Microsoft OpenGL 1.1 bug where glBitmap with\n"); printf(" a height or width of zero does not advance the raster position\n"); printf(" as specified by OpenGL. (Cosmo OpenGL does not have this bug.) */\n"); printf("static const GLubyte ch%ddata[] = { 0x0 };\n", num); printf("static const BitmapCharRec ch%d = {", num); printf("%d,", 0); printf("%d,", 0); printf("%d,", xoff); printf("%d,", yoff); printf("%d,", advance); printf("ch%ddata", num); printf("};\n"); printf("#else\n"); } printf("static const BitmapCharRec ch%d = {", num); printf("%d,", width); printf("%d,", height); printf("%d,", xoff); printf("%d,", yoff); printf("%d,", advance); if (data) { printf("ch%ddata", num); } else { printf("0"); } printf("};\n"); if (width == 0 || height == 0) { printf("#endif\n"); } printf("\n"); } /* Can't just use isprint because it only works for the range of ASCII characters (ie, TRUE for isascii) and capturexfont might be run on 16-bit fonts. */ #define PRINTABLE(ch) (isascii(ch) ? isprint(ch) : 0) void captureXFont(Display * dpy, Font font, char *xfont, char *name) { int first, last, count; int cnt, len; Pixmap offscreen; Window drawable; XFontStruct *fontinfo; XImage *image; GC xgc; XGCValues values; int width, height; int i, j, k; XCharStruct *charinfo; XChar2b character; GLubyte *bitmapData; int x, y; int spanLength; int charWidth, charHeight, maxSpanLength, pixwidth; int grabList[MAX_GLYPHS_PER_GRAB]; int glyphsPerGrab = MAX_GLYPHS_PER_GRAB; int numToGrab; int rows, pages, byte1, byte2, index; int nullBitmap; drawable = RootWindow(dpy, DefaultScreen(dpy)); fontinfo = XQueryFont(dpy, font); pages = fontinfo->max_char_or_byte2 - fontinfo->min_char_or_byte2 + 1; first = (fontinfo->min_byte1 << 8) + fontinfo->min_char_or_byte2; last = (fontinfo->max_byte1 << 8) + fontinfo->max_char_or_byte2; count = last - first + 1; width = fontinfo->max_bounds.rbearing - fontinfo->min_bounds.lbearing; height = fontinfo->max_bounds.ascent + fontinfo->max_bounds.descent; /* 16-bit fonts have more than one row; indexing into per_char is trickier. */ rows = fontinfo->max_byte1 - fontinfo->min_byte1 + 1; maxSpanLength = (width + 7) / 8; /* For portability reasons we don't use alloca for bitmapData, but we could. */ bitmapData = malloc(height * maxSpanLength); /* 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, drawable, 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; } printf("\n/* GENERATED FILE -- DO NOT MODIFY */\n\n"); printf("#include \"glutbitmap.h\"\n\n"); for (i = first; count; i++, count--) { int undefined; if (rows == 1) { undefined = (fontinfo->min_char_or_byte2 > i || fontinfo->max_char_or_byte2 < i); } else { byte2 = i & 0xff; byte1 = i >> 8; undefined = (fontinfo->min_char_or_byte2 > byte2 || fontinfo->max_char_or_byte2 < byte2 || fontinfo->min_byte1 > byte1 || fontinfo->max_byte1 < byte1); } if (undefined) { goto PossiblyDoGrab; } if (fontinfo->per_char != NULL) { if (rows == 1) { index = i - fontinfo->min_char_or_byte2; } else { byte2 = i & 0xff; byte1 = i >> 8; index = (byte1 - fontinfo->min_byte1) * pages + (byte2 - fontinfo->min_char_or_byte2); } charinfo = &(fontinfo->per_char[index]); charWidth = charinfo->rbearing - charinfo->lbearing; charHeight = charinfo->ascent + charinfo->descent; if (charWidth == 0 || charHeight == 0) { if (charinfo->width != 0) { /* Still must move raster pos even if empty character */ outputChar(i, 0, 0, 0, 0, charinfo->width, 0); } goto PossiblyDoGrab; } } grabList[numToGrab] = i; character.byte2 = i & 255; character.byte1 = i >> 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 then XDrawImage16 for the text. */ XDrawString16(dpy, offscreen, xgc, -charinfo->lbearing + 8 * maxSpanLength * numToGrab, charinfo->ascent, &character, 1); numToGrab++; PossiblyDoGrab: if (numToGrab >= glyphsPerGrab || count == 1) { image = XGetImage(dpy, offscreen, 0, 0, pixwidth, height, 1, XYPixmap); for (j = numToGrab - 1; j >= 0; j--) { if (fontinfo->per_char != NULL) { byte2 = grabList[j] & 0xff; byte1 = grabList[j] >> 8; index = (byte1 - fontinfo->min_byte1) * pages + (byte2 - fontinfo->min_char_or_byte2); charinfo = &(fontinfo->per_char[index]); charWidth = charinfo->rbearing - charinfo->lbearing; charHeight = charinfo->ascent + charinfo->descent; spanLength = (charWidth + 7) / 8; } memset(bitmapData, 0, height * spanLength); for (y = 0; y < charHeight; y++) { for (x = 0; x < charWidth; x++) { if (XGetPixel(image, j * maxSpanLength * 8 + x, charHeight - 1 - y)) { /* Little endian machines (such as DEC Alpha) could benefit from reversing the bit order here and changing the GL_UNPACK_LSB_FIRST parameter in glutBitmapCharacter to GL_TRUE. */ bitmapData[y * spanLength + x / 8] |= (1 << (7 - (x & 7))); } } } if (PRINTABLE(grabList[j])) { printf("/* char: 0x%x '%c' */\n\n", grabList[j], grabList[j]); } else { printf("/* char: 0x%x */\n\n", grabList[j]); } /* Determine if the bitmap is null. */ nullBitmap = 1; len = (charinfo->ascent + charinfo->descent) * ((charinfo->rbearing - charinfo->lbearing + 7) / 8); cnt = 0; while (cnt < len) { for (k = 0; k < 16 && cnt < len; k++, cnt++) { if (bitmapData[cnt] != 0) { nullBitmap = 0; } } } if (!nullBitmap) { printf("static const GLubyte ch%ddata[] = {\n", grabList[j]); len = (charinfo->ascent + charinfo->descent) * ((charinfo->rbearing - charinfo->lbearing + 7) / 8); cnt = 0; while (cnt < len) { for (k = 0; k < 16 && cnt < len; k++, cnt++) { printf("0x%x,", bitmapData[cnt]); } printf("\n"); } printf("};\n\n"); } else { charWidth = 0; charHeight = 0; } outputChar(grabList[j], charWidth, charHeight, -charinfo->lbearing, charinfo->descent, charinfo->width, !nullBitmap); } XDestroyImage(image); numToGrab = 0; if (count > 0) { XSetForeground(dpy, xgc, 0); XFillRectangle(dpy, offscreen, xgc, 0, 0, 8 * maxSpanLength * glyphsPerGrab, height); XSetForeground(dpy, xgc, 1); } } } XFreeGC(dpy, xgc); XFreePixmap(dpy, offscreen); /* For portability reasons we don't use alloca for bitmapData, but we could. */ free(bitmapData); printf("static const BitmapCharRec * const chars[] = {\n"); for (i = first; i <= last; i++) { int undefined; byte2 = i & 0xff; byte1 = i >> 8; undefined = (fontinfo->min_char_or_byte2 > byte2 || fontinfo->max_char_or_byte2 < byte2 || fontinfo->min_byte1 > byte1 || fontinfo->max_byte1 < byte1); if (undefined) { printf("0,\n"); } else { if (fontinfo->per_char != NULL) { if (rows == 1) { index = i - fontinfo->min_char_or_byte2; } else { byte2 = i & 0xff; byte1 = i >> 8; index = (byte1 - fontinfo->min_byte1) * pages + (byte2 - fontinfo->min_char_or_byte2); } charinfo = &(fontinfo->per_char[index]); charWidth = charinfo->rbearing - charinfo->lbearing; charHeight = charinfo->ascent + charinfo->descent; if (charWidth == 0 || charHeight == 0) { if (charinfo->width == 0) { printf("0,\n"); continue; } } } printf("&ch%d,\n", i); } } printf("};\n\n"); printf("GLUTAPI const BitmapFontRec %s;\n", name); printf("const BitmapFontRec %s = {\n", name); printf("\"%s\",\n", xfont); printf("%d,\n", last - first + 1); printf("%d,\n", first); printf("chars\n"); printf("};\n\n"); XFreeFont(dpy, fontinfo); } int main(int argc, char **argv) { Display *dpy; Font font; if (argc != 3) { fprintf(stderr, "usage: capturexfont XFONT NAME\n"); exit(1); } dpy = XOpenDisplay(NULL); if (dpy == NULL) { fprintf(stderr, "capturexfont: could not open X display\n"); exit(1); } font = XLoadFont(dpy, argv[1]); if (font == None) { fprintf(stderr, "capturexfont: bad font\n"); exit(1); } captureXFont(dpy, font, argv[1], argv[2]); XCloseDisplay(dpy); return 0; }