-/* glxfonts, Copyright (c) 2001-2008 Jamie Zawinski <jwz@jwz.org>
+/* glxfonts, Copyright (c) 2001-2009 Jamie Zawinski <jwz@jwz.org>
* Loads X11 fonts for use with OpenGL.
*
* Permission to use, copy, modify, distribute, and sell this software and its
*/
+/* Mostly lifted from the Mesa implementation of glXUseXFont(), since
+ Mac OS 10.6 no longer supports aglUseFont() which was their analog
+ of that. This code could be in libjwxyz instead, but we might as
+ well use the same text-drawing code on both X11 and Cocoa.
+ */
+static void
+fill_bitmap (Display *dpy, Window win, GC gc,
+ unsigned int width, unsigned int height,
+ int x0, int y0, char c, GLubyte *bitmap)
+{
+ XImage *image;
+ int x, y;
+ Pixmap pixmap;
+
+ pixmap = XCreatePixmap (dpy, win, 8*width, height, 1);
+ XSetForeground(dpy, gc, 0);
+ XFillRectangle (dpy, pixmap, gc, 0, 0, 8*width, height);
+ XSetForeground(dpy, gc, 1);
+ XDrawString (dpy, pixmap, gc, x0, y0, &c, 1);
+
+ image = XGetImage (dpy, pixmap, 0, 0, 8*width, height, 1, XYPixmap);
+
+ /* Fill the bitmap (X11 and OpenGL are upside down wrt each other). */
+ for (y = 0; y < height; y++)
+ for (x = 0; x < 8*width; x++)
+ if (XGetPixel (image, x, y))
+ bitmap[width*(height - y - 1) + x/8] |= (1 << (7 - (x % 8)));
+
+ XFreePixmap (dpy, pixmap);
+ XDestroyImage (image);
+}
+
+
+#if 0
+static void
+dump_bitmap (unsigned int width, unsigned int height, GLubyte *bitmap)
+{
+ int x, y;
+
+ printf (" ");
+ for (x = 0; x < 8*width; x++)
+ printf ("%o", 7 - (x % 8));
+ putchar ('\n');
+ for (y = 0; y < height; y++)
+ {
+ printf ("%3o:", y);
+ for (x = 0; x < 8*width; x++)
+ putchar ((bitmap[width*(height - y - 1) + x/8] & (1 << (7 - (x % 8))))
+ ? '#' : '.');
+ printf (" ");
+ for (x = 0; x < width; x++)
+ printf ("0x%02x, ", bitmap[width*(height - y - 1) + x]);
+ putchar ('\n');
+ }
+}
+#endif
+
+
+void
+xscreensaver_glXUseXFont (Display *dpy, Font font,
+ int first, int count, int listbase)
+{
+ Window win = RootWindowOfScreen (DefaultScreenOfDisplay (dpy));
+ Pixmap pixmap;
+ GC gc;
+ XGCValues values;
+ unsigned long valuemask;
+
+ XFontStruct *fs;
+
+ GLint swapbytes, lsbfirst, rowlength;
+ GLint skiprows, skippixels, alignment;
+
+ unsigned int max_width, max_height, max_bm_width, max_bm_height;
+ GLubyte *bm;
+
+ int i;
+
+ fs = XQueryFont (dpy, font);
+ if (!fs)
+ {
+ /*gl_error (CC->gl_ctx, GL_INVALID_VALUE,
+ "Couldn't get font structure information");*/
+ abort();
+ return;
+ }
+
+ /* Allocate a bitmap that can fit all characters. */
+ max_width = fs->max_bounds.rbearing - fs->min_bounds.lbearing;
+ max_height = fs->max_bounds.ascent + fs->max_bounds.descent;
+ max_bm_width = (max_width + 7) / 8;
+ max_bm_height = max_height;
+
+ bm = (GLubyte *) malloc ((max_bm_width * max_bm_height) * sizeof (GLubyte));
+ if (!bm)
+ {
+ /*gl_error (CC->gl_ctx, GL_OUT_OF_MEMORY,
+ "Couldn't allocate bitmap in glXUseXFont()");*/
+ abort();
+ return;
+ }
+
+ /* Save the current packing mode for bitmaps. */
+ glGetIntegerv (GL_UNPACK_SWAP_BYTES, &swapbytes);
+ glGetIntegerv (GL_UNPACK_LSB_FIRST, &lsbfirst);
+ glGetIntegerv (GL_UNPACK_ROW_LENGTH, &rowlength);
+ glGetIntegerv (GL_UNPACK_SKIP_ROWS, &skiprows);
+ glGetIntegerv (GL_UNPACK_SKIP_PIXELS, &skippixels);
+ glGetIntegerv (GL_UNPACK_ALIGNMENT, &alignment);
+
+ /* Enforce a standard packing mode which is compatible with
+ fill_bitmap() from above. This is actually the default mode,
+ except for the (non)alignment. */
+ glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE);
+ glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE);
+ glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
+ glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
+ glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
+ glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
+
+ pixmap = XCreatePixmap (dpy, win, 10, 10, 1);
+ values.foreground = 0;
+ values.background = 1;
+ values.font = fs->fid;
+ valuemask = GCForeground | GCBackground | GCFont;
+ gc = XCreateGC (dpy, pixmap, valuemask, &values);
+ XFreePixmap (dpy, pixmap);
+
+# ifdef HAVE_COCOA
+ /* Anti-aliasing of fonts looks like crap with 1-bit bitmaps.
+ It would be nice if we were using full-depth bitmaps, so
+ that the text showed up anti-aliased on screen, but
+ glBitmap() doesn't work that way. */
+ jwxyz_XSetAntiAliasing (dpy, gc, False);
+# endif
+
+ for (i = 0; i < count; i++)
+ {
+ unsigned int width, height, bm_width, bm_height;
+ GLfloat x0, y0, dx, dy;
+ XCharStruct *ch;
+ int x, y;
+ int c = first + i;
+ int list = listbase + i;
+
+ if (fs->per_char
+ && (c >= fs->min_char_or_byte2) && (c <= fs->max_char_or_byte2))
+ ch = &fs->per_char[c-fs->min_char_or_byte2];
+ else
+ ch = &fs->max_bounds;
+
+ /* I'm not entirely clear on why this is necessary on OSX, but
+ without it, the characters are clipped. And it does not hurt
+ under real X11. -- jwz. */
+ ch->lbearing--;
+ ch->ascent++;
+
+ /* glBitmap()'s parameters:
+ "Bitmap parameters xorig, yorig, width, and height are
+ computed from font metrics as descent-1, -lbearing,
+ rbearing-lbearing, and ascent+descent, respectively.
+ xmove is taken from the glyph's width metric, and
+ ymove is set to zero. Finally, the glyph's image is
+ converted to the appropriate format for glBitmap."
+ */
+ width = ch->rbearing - ch->lbearing;
+ height = ch->ascent + ch->descent;
+ x0 = - ch->lbearing;
+ y0 = ch->descent - 1;
+ dx = ch->width;
+ dy = 0;
+
+ /* X11's starting point. */
+ x = - ch->lbearing;
+ y = ch->ascent;
+
+ /* Round the width to a multiple of eight. We will use this also
+ for the pixmap for capturing the X11 font. This is slightly
+ inefficient, but it makes the OpenGL part real easy. */
+ bm_width = (width + 7) / 8;
+ bm_height = height;
+
+ glNewList (list, GL_COMPILE);
+ if ((c >= fs->min_char_or_byte2) && (c <= fs->max_char_or_byte2)
+ && (bm_width > 0) && (bm_height > 0))
+ {
+ memset (bm, '\0', bm_width * bm_height);
+ fill_bitmap (dpy, win, gc, bm_width, bm_height, x, y, c, bm);
+ glBitmap (width, height, x0, y0, dx, dy, bm);
+#if 0
+ printf ("width/height = %d/%d\n", width, height);
+ printf ("bm_width/bm_height = %d/%d\n", bm_width, bm_height);
+ dump_bitmap (bm_width, bm_height, bm);
+#endif
+ }
+ else
+ glBitmap (0, 0, 0.0, 0.0, dx, dy, NULL);
+ glEndList ();
+ }
+
+ free (bm);
+ XFreeFontInfo( NULL, fs, 0 );
+ XFreeGC (dpy, gc);
+
+ /* Restore saved packing modes. */
+ glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes);
+ glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst);
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength);
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
+}
+
+
+
/* Loads the font named by the X resource "res".
Returns an XFontStruct.
Also converts the font to a set of GL lists and returns the first list.
last = f->max_char_or_byte2;
-# ifndef HAVE_COCOA /* Xlib version */
-
if (dlist_ret)
{
clear_gl_error ();
*dlist_ret = glGenLists ((GLuint) last+1);
check_gl_error ("glGenLists");
- glXUseXFont(id, first, last-first+1, *dlist_ret + first);
- check_gl_error ("glXUseXFont");
- }
-
-# else /* HAVE_COCOA */
-
- {
- int afid, face, size;
- afid = jwxyz_font_info (id, &size, &face);
-
- if (dlist_ret)
- {
- clear_gl_error ();
- *dlist_ret = glGenLists ((GLuint) last+1);
- check_gl_error ("glGenLists");
-
- AGLContext ctx = aglGetCurrentContext();
- if (! aglUseFont (ctx, afid, face, size,
- first, last-first+1, *dlist_ret + first)) {
- check_gl_error ("aglUseFont");
- abort();
- }
+ xscreensaver_glXUseXFont(dpy, id, first, last-first+1,
+ *dlist_ret + first);
+ check_gl_error ("xscreensaver_glXUseXFont");
}
- }
-
-# endif /* HAVE_COCOA */
if (font_ret)
*font_ret = f;
projects / xscreensaver / blobdiff