capturexfont.c
上传用户:xk288cn
上传日期:2007-05-28
资源大小:4876k
文件大小:11k
- /* 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 */
- #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 _WIN32n");
- printf("/* XXX Work around Microsoft OpenGL 1.1 bug where glBitmap withn");
- printf(" a height or width of zero does not advance the raster positionn");
- 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("#elsen");
- }
- 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("#endifn");
- }
- 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 */nn");
- printf("#include "glutbitmap.h"nn");
- 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' */nn",
- grabList[j], grabList[j]);
- } else {
- printf("/* char: 0x%x */nn", 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("};nn");
- } 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("};nn");
- printf("const BitmapFontRec %s = {n", name);
- printf(""%s",n", xfont);
- printf("%d,n", last - first + 1);
- printf("%d,n", first);
- printf("charsn");
- printf("};nn");
- XFreeFont(dpy, fontinfo);
- }
- int
- main(int argc, char **argv)
- {
- Display *dpy;
- Font font;
- if (argc != 3) {
- fprintf(stderr, "usage: capturexfont XFONT NAMEn");
- exit(1);
- }
- dpy = XOpenDisplay(NULL);
- if (dpy == NULL) {
- fprintf(stderr, "capturexfont: could not open X displayn");
- exit(1);
- }
- font = XLoadFont(dpy, argv[1]);
- if (font == None) {
- fprintf(stderr, "capturexfont: bad fontn");
- exit(1);
- }
- captureXFont(dpy, font, argv[1], argv[2]);
- XCloseDisplay(dpy);
- return 0;
- }