Initial revision

1 files changed, 398 insertions, 0 deletions

diff --git a/src/mesa/drivers/x11/xfonts.c b/src/mesa/drivers/x11/xfonts.c
new file mode 100644
index 00000000000..c0e0a5fcd01
--- /dev/null
+++ b/src/mesa/drivers/x11/xfonts.c
@@ -0,0 +1,398 @@
+/* $Id: xfonts.c,v 1.1 1999/08/19 00:55:42 jtg Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.1
+ *
+ * Copyright (C) 1999  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/* xfonts.c -- glXUseXFont() for Mesa written by
+ * Copyright (C) 1995 Thorsten.Ohl @ Physik.TH-Darmstadt.de
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include "conf.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include "GL/gl.h"
+#include "GL/glx.h"
+#include "GL/xmesa.h"
+#include "context.h"
+#include "fakeglx.h"
+#include "macros.h"
+#include "xmesaP.h"
+
+/* Some debugging info.  */
+
+#ifdef DEBUG
+#undef _R
+#undef _G
+#undef _B
+#include <ctype.h>
+
+int debug_xfonts = 0;
+
+static void
+dump_char_struct (XCharStruct *ch, char *prefix)
+{
+  printf ("%slbearing = %d, rbearing = %d, width = %d\n",
+          prefix, ch->lbearing, ch->rbearing, ch->width);
+  printf ("%sascent = %d, descent = %d, attributes = %u\n",
+          prefix, ch->ascent, ch->descent, (unsigned int) ch->attributes);
+}
+
+static void
+dump_font_struct (XFontStruct *font)
+{
+  printf ("ascent = %d, descent = %d\n", font->ascent, font->descent);
+  printf ("char_or_byte2 = (%u,%u)\n",
+          font->min_char_or_byte2, font->max_char_or_byte2);
+  printf ("byte1 = (%u,%u)\n", font->min_byte1, font->max_byte1);
+  printf ("all_chars_exist = %s\n", font->all_chars_exist ? "True" : 
+"False");
+  printf ("default_char = %c (\\%03o)\n",
+          (char) (isprint (font->default_char) ? font->default_char : ' '),
+          font->default_char);
+  dump_char_struct (&font->min_bounds, "min> ");
+  dump_char_struct (&font->max_bounds, "max> ");
+#if 0
+  for (c = font->min_char_or_byte2; c <= font->max_char_or_byte2; c++)
+    {
+      char prefix[8];
+      sprintf (prefix, "%d> ", c);
+      dump_char_struct (&font->per_char[c], prefix);
+    }
+#endif
+}
+
+static void
+dump_bitmap (unsigned int width, unsigned int height, GLubyte *bitmap)
+{
+  unsigned 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 /* DEBUG */
+
+
+/* Implementation.  */
+
+/* Fill a BITMAP with a character C from thew current font
+   in the graphics context GC.  WIDTH is the width in bytes
+   and HEIGHT is the height in bits.
+
+   Note that the generated bitmaps must be used with
+
+        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);
+
+   Possible optimizations:
+
+     * use only one reusable pixmap with the maximum dimensions.
+     * draw the entire font into a single pixmap (careful with
+       proportional fonts!).
+*/
+
+
+/*
+ * Generate OpenGL-compatible bitmap.
+ */
+static void
+fill_bitmap (Display *dpy, Window win, GC gc,
+             unsigned int width, unsigned int height,
+             int x0, int y0, unsigned int c, GLubyte *bitmap)
+{
+  XImage *image;
+  unsigned int x, y;
+  Pixmap pixmap;
+  XChar2b char2b;
+
+  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);
+
+  char2b.byte1 = (c >> 8) & 0xff;
+  char2b.byte2 = (c & 0xff);
+
+  XDrawString16 (dpy, pixmap, gc, x0, y0, &char2b, 1);
+
+  image = XGetImage (dpy, pixmap, 0, 0, 8*width, height, 1, XYPixmap);
+  if (image) {
+    /* 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)));
+    XDestroyImage (image);
+  }
+
+  XFreePixmap (dpy, pixmap);
+}
+
+/*
+ * determine if a given glyph is valid and return the
+ * corresponding XCharStruct.
+ */
+static XCharStruct *isvalid(XFontStruct *fs, int which)
+{
+  unsigned int  rows,pages;
+  int           byte1,byte2;
+  int           i,valid = 1;
+
+  rows = fs->max_byte1 - fs->min_byte1 + 1;
+  pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1;
+
+  if (rows == 1) {
+    /* "linear" fonts */
+    if ((fs->min_char_or_byte2 > which) ||
+        (fs->max_char_or_byte2 < which)) valid = 0;
+  } else {
+    /* "matrix" fonts */
+    byte2 = which & 0xff;
+    byte1 = which >> 8;
+    if ((fs->min_char_or_byte2 > byte2) ||
+        (fs->max_char_or_byte2 < byte2) ||
+        (fs->min_byte1 > byte1) ||
+        (fs->max_byte1 < byte1)) valid = 0;
+  }
+
+  if (valid) {
+    if (fs->per_char) {
+      if (rows == 1) {
+        /* "linear" fonts */
+        return(fs->per_char + (which-fs->min_char_or_byte2) );
+      } else {
+        /* "matrix" fonts */
+        i = ((byte1 - fs->min_byte1) * pages) +
+             (byte2 - fs->min_char_or_byte2);
+        return(fs->per_char + i);
+      }
+    } else {
+        return(&fs->min_bounds);
+    }
+  }
+  return(NULL);
+}
+
+
+void Fake_glXUseXFont( Font font, int first, int count, int listbase )
+{
+  XMesaContext CC;
+  Display *dpy;
+  Window win;
+  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;
+
+  CC = XMesaGetCurrentContext();
+  dpy = CC->display;
+  win = CC->xm_buffer->frontbuffer;
+
+  fs = XQueryFont (dpy, font);
+  if (!fs)
+    {
+      gl_error (CC->gl_ctx, GL_INVALID_VALUE,
+                "Couldn't get font structure information");
+      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) {
+      XFreeFontInfo( NULL, fs, 0 );
+      gl_error (CC->gl_ctx, GL_OUT_OF_MEMORY,
+                "Couldn't allocate bitmap in glXUseXFont()");
+      return;
+    }
+
+#if 0
+  /* get the page info */
+  pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1;
+  firstchar = (fs->min_byte1 << 8) + fs->min_char_or_byte2;
+  lastchar = (fs->max_byte1 << 8) + fs->max_char_or_byte2;
+  rows = fs->max_byte1 - fs->min_byte1 + 1;
+  unsigned int first_char, last_char, pages, rows;
+#endif
+
+  /* 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 = BlackPixel (dpy, DefaultScreen (dpy));
+  values.background = WhitePixel (dpy, DefaultScreen (dpy));
+  values.font = fs->fid;
+  valuemask = GCForeground | GCBackground | GCFont;
+  gc = XCreateGC (dpy, pixmap, valuemask, &values);
+  XFreePixmap (dpy, pixmap);
+
+#ifdef DEBUG
+  if (debug_xfonts)
+    dump_font_struct (fs);
+#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;
+      unsigned int c = first + i;
+      int list = listbase + i;
+      int valid;
+
+      /* check on index validity and get the bounds */
+      ch = isvalid(fs, c);
+      if (!ch) {
+        ch = &fs->max_bounds;
+        valid = 0;
+      } else {
+        valid = 1;
+      }
+
+#ifdef DEBUG
+      if (debug_xfonts) {
+          char s[7];
+          sprintf (s, isprint (c) ? "%c> " : "\\%03o> ", c);
+          dump_char_struct (ch, s);
+      }
+#endif
+
+      /* glBitmap()' parameters:
+         straight from the glXUseXFont(3) manpage.  */
+      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 (valid && (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);
+#ifdef DEBUG
+            if (debug_xfonts) {
+                printf ("width/height = %u/%u\n", width, height);
+                printf ("bm_width/bm_height = %u/%u\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);
+}
+
+void xmesa_xfonts_dummy( void )
+{
+   /* silence unused var warnings */
+   (void) kernel8;
+   (void) DitherValues;
+   (void) HPCR_DRGB;
+   (void) kernel1;
+}
+
+/* The End. */