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 <GL/glut_cgx.h>
9 #include "glutint.h"
10 #include "glutbitmap.h"
11
12 void APIENTRY
glutBitmapCharacter(GLUTbitmapFont font,int c)13 glutBitmapCharacter(GLUTbitmapFont font, int c)
14 {
15 const BitmapCharRec *ch;
16 BitmapFontPtr fontinfo;
17 GLint swapbytes, lsbfirst, rowlength;
18 GLint skiprows, skippixels, alignment;
19
20 #if defined(WIN32)
21 fontinfo = (BitmapFontPtr) __glutFont(font);
22 #else
23 fontinfo = (BitmapFontPtr) font;
24 #endif
25
26 if (c < fontinfo->first ||
27 c >= fontinfo->first + fontinfo->num_chars)
28 return;
29 ch = fontinfo->ch[c - fontinfo->first];
30 if (ch) {
31 /* Save current modes. */
32 glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes);
33 glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst);
34 glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength);
35 glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows);
36 glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels);
37 glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment);
38 /* Little endian machines (DEC Alpha for example) could
39 benefit from setting GL_UNPACK_LSB_FIRST to GL_TRUE
40 instead of GL_FALSE, but this would require changing the
41 generated bitmaps too. */
42 glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
43 glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
44 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
45 glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
46 glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
47 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
48 glBitmap(ch->width, ch->height, ch->xorig, ch->yorig,
49 ch->advance, 0, ch->bitmap);
50 /* Restore saved modes. */
51 glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes);
52 glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst);
53 glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength);
54 glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows);
55 glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels);
56 glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
57 }
58 }
59