diff options
Diffstat (limited to 'src/glx/x11/xfont.c')
| -rw-r--r-- | src/glx/x11/xfont.c | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/src/glx/x11/xfont.c b/src/glx/x11/xfont.c new file mode 100644 index 00000000000..5f23a796221 --- /dev/null +++ b/src/glx/x11/xfont.c @@ -0,0 +1,377 @@ +/* $XFree86: xc/lib/GL/glx/xfont.c,v 1.6 2001/05/02 15:06:02 dawes 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 + */ + +/* + This was take from Mesa and modified to work in the real GLX structure. + It provides a fully client side implementation of glXUseXFont and is + called by that routine when direct rendering is enabled. +*/ + + +#include "glxclient.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 = 0, byte2 = 0; + 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 DRI_glXUseXFont( Font font, int first, int count, int listbase ) +{ + GLXContext 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 = __glXGetCurrentContext(); + dpy = CC->currentDpy; + win = CC->currentDrawable; + + fs = XQueryFont (dpy, font); + if (!fs) + { + __glXSetError(CC, GL_INVALID_VALUE); + 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 *) Xmalloc((max_bm_width * max_bm_height) * sizeof +(GLubyte)); + if (!bm) { + XFreeFontInfo( NULL, fs, 1 ); + __glXSetError(CC, GL_OUT_OF_MEMORY); + 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 (); + } + + Xfree(bm); + XFreeFontInfo( NULL, fs, 1 ); + 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); +} + +/* The End. */ |