+++ /dev/null
-/* font-ximage.c --- renders text to an XImage for use with OpenGL.
- * xscreensaver, Copyright (c) 2001-2013 Jamie Zawinski <jwz@jwz.org>
- *
- * Permission to use, copy, modify, distribute, and sell this software and its
- * documentation for any purpose is hereby granted without fee, provided that
- * the above copyright notice appear in all copies and that both that
- * copyright notice and this permission notice appear in supporting
- * documentation. No representations are made about the suitability of this
- * software for any purpose. It is provided "as is" without express or
- * implied warranty.
- */
-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-
-#ifdef HAVE_COCOA
-# include "jwxyz.h"
-#else /* !HAVE_COCOA */
-# include <X11/Xlib.h>
-# include <X11/Xutil.h>
-# include <GL/gl.h> /* only for GLfloat */
-#endif /* !HAVE_COCOA */
-
-#ifdef HAVE_JWZGLES
-# include "jwzgles.h"
-#endif /* HAVE_JWZGLES */
-
-extern char *progname;
-
-#include "font-ximage.h"
-
-#undef MAX
-#define MAX(a,b) ((a)>(b)?(a):(b))
-
-#undef countof
-#define countof(x) (sizeof((x))/sizeof((*x)))
-
-#if 0
-static Bool
-bigendian (void)
-{
- union { int i; char c[sizeof(int)]; } u;
- u.i = 1;
- return !u.c[0];
-}
-#endif
-
-/* return the next larger power of 2. */
-static int
-to_pow2 (int i)
-{
- static const unsigned int pow2[] = {
- 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024,
- 2048, 4096, 8192, 16384, 32768, 65536 };
- int j;
- for (j = 0; j < countof(pow2); j++)
- if (pow2[j] >= i) return pow2[j];
- abort(); /* too big! */
-}
-
-
-/* Returns an XImage structure containing the string rendered in the font.
- This XImage will be 32 bits per pixel, 8 each per R, G, and B, with the
- extra byte set to 0xFF.
-
- Foreground and background are GL-style color specifiers: 4 floats from
- 0.0-1.0.
- */
-XImage *
-text_to_ximage (Screen *screen, Visual *visual,
- const char *font,
- const char *text_lines,
- GLfloat *texture_fg,
- GLfloat *texture_bg)
-{
- Display *dpy = DisplayOfScreen (screen);
- int width, height;
- XFontStruct *f;
- Pixmap bitmap;
-
- f = XLoadQueryFont(dpy, font);
- if (!f)
- {
- f = XLoadQueryFont(dpy, "fixed");
- if (f)
- fprintf (stderr, "%s: unable to load font \"%s\"; using \"fixed\".\n",
- progname, font);
- else
- {
- fprintf (stderr, "%s: unable to load fonts \"%s\" or \"fixed\"!\n",
- progname, font);
- exit (1);
- }
- }
-
- /* Parse the text, and render it to `bitmap'
- */
- {
- char *text, *text2, *line, *token;
- int lines;
- XCharStruct overall;
- XGCValues gcv;
- GC gc;
-
- int margin = 2;
- int fg = 1;
- int bg = 0;
- int xoff, yoff;
-
- text = strdup (text_lines);
- while (*text &&
- (text[strlen(text)-1] == '\r' ||
- text[strlen(text)-1] == '\n'))
- text[strlen(text)-1] = 0;
-
- text2 = strdup (text);
-
- memset(&overall, 0, sizeof(overall));
- token = text;
- lines = 0;
- while ((line = strtok (token, "\r\n")))
- {
- XCharStruct o2;
- int ascent, descent, direction;
- token = 0;
- XTextExtents (f, line, (int) strlen(line),
- &direction, &ascent, &descent, &o2);
- overall.lbearing = MAX(overall.lbearing, o2.lbearing);
- overall.rbearing = MAX(overall.rbearing, o2.rbearing);
- lines++;
- }
- free (text);
- text = 0;
-
- width = overall.lbearing + overall.rbearing + margin + margin + 1;
- height = ((f->ascent + f->descent) * lines) + margin + margin;
-
- /* GL texture sizes must be powers of two. */
- {
- int w2 = to_pow2(width);
- int h2 = to_pow2(height);
- xoff = (w2 - width) / 2;
- yoff = (h2 - height) / 2;
- width = w2;
- height = h2;
- }
-
- bitmap = XCreatePixmap(dpy, RootWindowOfScreen (screen), width, height, 1);
-
- gcv.font = f->fid;
- gcv.foreground = bg;
- gc = XCreateGC (dpy, bitmap, (GCFont | GCForeground), &gcv);
- XFillRectangle(dpy, bitmap, gc, 0, 0, width, height);
- XSetForeground(dpy, gc, fg);
-
- token = text2;
- lines = 0;
- while ((line = strtok(token, "\r\n")))
- {
- XCharStruct o2;
- int ascent, descent, direction;
- token = 0;
-
- XTextExtents(f, line, (int)strlen(line),
- &direction, &ascent, &descent, &o2);
- XDrawString(dpy, bitmap, gc,
- overall.lbearing + margin + xoff,
- ((f->ascent * (lines + 1)) +
- (f->descent * lines) +
- margin +
- yoff),
- line, (int) strlen(line));
- lines++;
- }
- free(text2);
-
- XUnloadFont(dpy, f->fid);
- XFree((XPointer) f);
- XFreeGC(dpy, gc);
- }
-
- /* Convert the server-side Pixmap to a client-side GL-ordered XImage.
- */
- {
- XImage *ximage1, *ximage2;
- unsigned long fg, bg;
- int x, y;
-
- ximage1 = XGetImage (dpy, bitmap, 0, 0, width, height, ~0L, ZPixmap);
- XFreePixmap(dpy, bitmap);
- ximage2 = XCreateImage (dpy, visual, 32, ZPixmap, 0, 0,
- width, height, 32, 0);
-
- ximage2->data = (char *) malloc (height * ximage2->bytes_per_line);
-
- /* Translate the 1-bit image to a deep image:
- first figure out what the colors are.
- */
- {
- int rpos, gpos, bpos, apos; /* bitfield positions */
-
- /* Note that unlike X, which is endianness-agnostic (since any XImage
- can have its own specific bit ordering, with the server reversing
- things as necessary) OpenGL pretends everything is client-side, so
- we need to pack things in the right order for the client machine.
- */
-#if 0
- /* #### Cherub says that the little-endian case must be taken on MacOSX,
- or else the colors/alpha are the wrong way around. How can
- that be the case?
- */
- if (bigendian())
- rpos = 24, gpos = 16, bpos = 8, apos = 0;
- else
-#endif
- rpos = 0, gpos = 8, bpos = 16, apos = 24;
-
- fg = (((unsigned long) (texture_fg[0] * 255.0) << rpos) |
- ((unsigned long) (texture_fg[1] * 255.0) << gpos) |
- ((unsigned long) (texture_fg[2] * 255.0) << bpos) |
- ((unsigned long) (texture_fg[3] * 255.0) << apos));
- bg = (((unsigned long) (texture_bg[0] * 255.0) << rpos) |
- ((unsigned long) (texture_bg[1] * 255.0) << gpos) |
- ((unsigned long) (texture_bg[2] * 255.0) << bpos) |
- ((unsigned long) (texture_bg[3] * 255.0) << apos));
- }
-
- for (y = 0; y < height; y++)
- {
- int y2 = (height-1-y); /* Texture maps are upside down. */
- for (x = 0; x < width; x++)
- XPutPixel (ximage2, x, y,
- XGetPixel (ximage1, x, y2) ? fg : bg);
- }
-
- XDestroyImage (ximage1);
-
-#if 0
- for (y = 0; y < height; y++)
- {
- int y2 = (height-1-y); /* Texture maps are upside down. */
- for (x = 0; x < width; x++)
- fputc ((XGetPixel (ximage2, x, y2) == fg ? '#' : ' '), stdout);
- fputc ('\n', stdout);
- }
- fputc ('\n', stdout);
-#endif /* 0 */
-
- return ximage2;
- }
-}
projects / xscreensaver / blobdiff