/*  camserv - An internet streaming picture application * *  Copyright (C) 1999-2002  Jon Travis (jtravis@p00p.org) * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License as published by *  the Free Software Foundation; either version 2 of the License, or *  (at your option) any later version. * *  This program is distributed in the hope that it will be useful, *  but WITHOUT ANY WARRANTY; without even the implied warranty of *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *  GNU General Public License for more details. * *  You should have received a copy of the GNU General Public License *  along with this program; if not, write to the Free Software *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */#include <stdio.h>#include <stdlib.h>#include "fixfont.h"/* * fixed_font_char_pack:  Pack a char into a FixedFontChar structure *                        from the header-file-thingy.   * * Arguments:             fontoffset = Pointer to character (offset in char[]) *                        width      = Width of character *                        height     = Height of character *                        buffer     = Location to place packed character */void fixed_font_char_pack( const unsigned char *fontoffset, 			   int width, int height,			   FixedFontChar *buffer ){  unsigned char *line_data_cp;  const unsigned char *fontcp;  int x, y, runtype;  /* Create packed representation of font information.      Since the fonts in this format are at most 16 pixels wide, we have     a lot of power to make this 'line_data' be anything we want.  The format     of line_data is as follows:     Each line represents information 'runs'.  Each run is given by 1     char in the line_data.  If 0 <= char < 16, then the next     char + 1 pixels are turned 'on'.  If 16 <= char < 32, then the     next char - 15 pixels are turned 'off'.  If char == 255, then     the runs for the line are completed, and scanning should cease. */  for( y=0, fontcp = fontoffset; y< height; y++, fontcp++ ){    line_data_cp = buffer->line_data[ y ];    runtype = FFONT_RUN_NONE;    for( x=7; x >= 0; x --){      if( *fontcp & (1 << x )) { /* Pixel on */	if( runtype == FFONT_RUN_NONE ) {	  runtype = FFONT_RUN_ON;	  *line_data_cp = 0;	} else if( runtype == FFONT_RUN_ON ) { /* Continuation */	  (*line_data_cp)++;	} else {	  /* Went from off to on */	  line_data_cp++;	  runtype = FFONT_RUN_ON;	  *line_data_cp = 0;	}      } else {	if( runtype == FFONT_RUN_NONE ) {	  runtype = FFONT_RUN_OFF;	  *line_data_cp = 16;	} else if( runtype == FFONT_RUN_OFF ) {	  (*line_data_cp)++;	} else {	  line_data_cp++;	  runtype = FFONT_RUN_OFF;	  *line_data_cp = 16;	}      }    }    /* Finish off the run with the terminator */    line_data_cp++;    *line_data_cp = FFONT_RUN_TERM_CHAR;  }}/* * fixed_font_destroy:  Destroy a fixed font structure * * Arguments:           ffont = font to destroy. */void fixed_font_destroy( FixedFont *ffont ){  free( ffont );}/* * fixed_font_create:  Create a packed fixed font structure given *                     an array containing the font info. * * Arguments:          fontset = Fixed font info from the header. *                     width   = Width of each char in fontset *                     height  = Height of each char in fontset * * Return values:      Returns NULL on failure, else a pointer to a new *                     FixedFont struct on success. */FixedFont *fixed_font_create( const unsigned char fontset[], 			      int width, int height ){  FixedFont *res;  int i;  if( width < 0 || width > FFONT_MAX_WIDTH ) return NULL;  if( height < 0 || height > FFONT_MAX_HEIGHT) return NULL;  if( (res = malloc( sizeof( *res ))) == NULL )    return NULL;  res->width = width;  res->height = height;  for( i=0; i< 256; i++ ){    fixed_font_char_pack( &fontset[ i * height ], width, height, 			  &res->chars[ i ]);  }  return res;}/* * fixed_font_print_char:  Print a character from the fixed font on stdout. *                         Primarily used for debugging. * * Arguments:              ffont = Fixed font to use *                         charval = Character value between 0 and 255 inclusiv */ void fixed_font_print_char( const FixedFont *ffont, int charval ){  int y, i;  const unsigned char *cp;  for( y=0; y< ffont->height; y++ ){    cp = ffont->chars[ charval ].line_data[ y ];    while( *cp != FFONT_RUN_TERM_CHAR ) {      if( *cp < 16 ) {	for( i=0; i<= *cp; i++ )	  printf(" " );      } else if( *cp < 32 ) {	for( i=16; i<= *cp; i++ )	  printf( "O" );      } else {	printf("!\n");      }      cp++;    }    printf("\n");  }}