src/glut/os2/glut_bitmap.cpp

   1
   2 /* Copyright (c) Mark J. Kilgard, 1994. */
   3
   4 /* This program is freely distributable without licensing fees
   5    and is provided without guarantee or warrantee expressed or
   6    implied. This program is -not- in the public domain. */
   7
   8 #include "glutint.h"
   9 #include "glutbitmap.h"
  10
  11 void GLUTAPIENTRY
  12 glutBitmapCharacter(GLUTbitmapFont font, int c)
  13 {
  14   const BitmapCharRec *ch;
  15   BitmapFontPtr fontinfo;
  16   GLint swapbytes, lsbfirst, rowlength;
  17   GLint skiprows, skippixels, alignment;
  18
  19 #if defined(_WIN32)
  20   fontinfo = (BitmapFontPtr) __glutFont(font);
  21 #else
  22   fontinfo = (BitmapFontPtr) font;
  23 #endif
  24
  25   if (c < fontinfo->first ||
  26     c >= fontinfo->first + fontinfo->num_chars)
  27     return;
  28   ch = fontinfo->ch[c - fontinfo->first];
  29   if (ch) {
  30     /* Save current modes. */
  31     glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes);
  32     glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst);
  33     glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength);
  34     glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows);
  35     glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels);
  36     glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment);
  37     /* Little endian machines (DEC Alpha for example) could
  38        benefit from setting GL_UNPACK_LSB_FIRST to GL_TRUE
  39        instead of GL_FALSE, but this would require changing the
  40        generated bitmaps too. */
  41     glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
  42     glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
  43     glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
  44     glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
  45     glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
  46     glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  47     glBitmap(ch->width, ch->height, ch->xorig, ch->yorig,
  48       ch->advance, 0, ch->bitmap);
  49     /* Restore saved modes. */
  50     glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes);
  51     glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst);
  52     glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength);
  53     glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows);
  54     glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels);
  55     glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
  56   }
  57 }