| 1 | /* $Id: glut_bitmap.c,v 1.4 2000-05-20 13:48:22 jeroen Exp $ */
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| 2 | /* Copyright (c) Mark J. Kilgard, 1994. */
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| 3 |
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| 4 | /* This program is freely distributable without licensing fees
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| 5 | and is provided without guarantee or warrantee expressed or
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| 6 | implied. This program is -not- in the public domain. */
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| 7 |
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| 8 | #include "glutint.h"
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| 9 | #include "glutbitmap.h"
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| 10 |
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| 11 | void APIENTRY
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| 12 | glutBitmapCharacter(GLUTbitmapFont font, int c)
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| 13 | {
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| 14 | const BitmapCharRec *ch;
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| 15 | BitmapFontPtr fontinfo;
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| 16 | GLint swapbytes, lsbfirst, rowlength;
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| 17 | GLint skiprows, skippixels, alignment;
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| 18 |
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| 19 | #if defined(_WIN32) || defined(__WIN32OS2__)
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| 20 | fontinfo = (BitmapFontPtr) __glutFont(font);
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| 21 | #else
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| 22 | fontinfo = (BitmapFontPtr) font;
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| 23 | #endif
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| 24 |
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| 25 | if (c < fontinfo->first ||
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| 26 | c >= fontinfo->first + fontinfo->num_chars)
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| 27 | return;
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| 28 | ch = fontinfo->ch[c - fontinfo->first];
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| 29 | if (ch) {
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| 30 | /* Save current modes. */
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| 31 | glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes);
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| 32 | glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst);
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| 33 | glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength);
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| 34 | glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows);
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| 35 | glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels);
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| 36 | glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment);
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| 37 | /* Little endian machines (DEC Alpha for example) could
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| 38 | benefit from setting GL_UNPACK_LSB_FIRST to GL_TRUE
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| 39 | instead of GL_FALSE, but this would require changing the
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| 40 | generated bitmaps too. */
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| 41 | glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
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| 42 | glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
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| 43 | glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
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| 44 | glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
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| 45 | glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
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| 46 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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| 47 | glBitmap(ch->width, ch->height, ch->xorig, ch->yorig,
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| 48 | ch->advance, 0, ch->bitmap);
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| 49 | /* Restore saved modes. */
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| 50 | glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes);
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| 51 | glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst);
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| 52 | glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength);
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| 53 | glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows);
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| 54 | glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels);
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| 55 | glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
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| 56 | }
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| 57 | }
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