src/glut/fbdev/bitmap.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  * Copyright (C) 1995-2006  Brian Paul
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Library General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Library General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Library General Public
  17  * License along with this library; if not, write to the Free
  18  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 /*
  22  * Library for glut using mesa fbdev driver
  23  *
  24  * Written by Sean D'Epagnier (c) 2006
  25  *
  26  * To improve on this library, maybe support subwindows or overlays,
  27  * I (sean at depagnier dot com) will do my best to help.
  28  */
  29
  30
  31 #include "glutbitmap.h"
  32
  33 void glutBitmapCharacter(GLUTbitmapFont font, int c)
  34 {
  35    const BitmapCharRec *ch;
  36    BitmapFontPtr fi = (BitmapFontPtr) font;
  37
  38    if (c < fi->first ||
  39        c >= fi->first + fi->num_chars)
  40       return;
  41    ch = fi->ch[c - fi->first];
  42    if (!ch)
  43       return;
  44
  45    glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
  46
  47    glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
  48    glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
  49    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
  50    glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
  51    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
  52    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  53    glBitmap(ch->width, ch->height, ch->xorig, ch->yorig,
  54             ch->advance, 0, ch->bitmap);
  55    glPopClientAttrib();
  56 }
  57
  58 int glutBitmapWidth (GLUTbitmapFont font, int c)
  59 {
  60    const BitmapCharRec *ch;
  61    BitmapFontPtr fi = (BitmapFontPtr) font;
  62
  63    if (c < fi->first || c >= fi->first + fi->num_chars)
  64       return 0;
  65    ch = fi->ch[c - fi->first];
  66    if (ch)
  67       return ch->advance;
  68    return 0;
  69 }
  70
  71 int glutBitmapLength(GLUTbitmapFont font, const unsigned char *string)
  72 {
  73    int length = 0;
  74
  75    for (; *string; string++)
  76       length += glutBitmapWidth(font, *string);
  77    return length;
  78 }