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  1. /*
  2.  * Copyright (C) 2006 Josef Cejka
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <screenbuffer.h>
  30. #include <malloc.h>
  31. #include <unistd.h>
  32.  
  33. /** Store one character to screenbuffer. Its position is determined by scr->position_x and scr->position_y.
  34.  * @param scr   screenbuffer
  35.  * @param c stored character
  36.  */
  37. void screenbuffer_putchar(screenbuffer_t *scr, char c)
  38. {
  39.     keyfield_t *field;
  40.    
  41.     field = get_field_at(scr, scr->position_x, scr->position_y);
  42.  
  43.     field->character = c;
  44.     field->style = scr->style;
  45. }
  46.  
  47. /** Initilize screenbuffer. Allocate space for screen content in accordance to given size.
  48.  * @param scr       initialized screenbuffer
  49.  * @param size_x   
  50.  * @param size_y
  51.  */
  52. screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y)
  53. {
  54.     if ((scr->buffer = (keyfield_t *)malloc(sizeof(keyfield_t) * size_x * size_y)) == NULL) {
  55.         return NULL;
  56.     }
  57.    
  58.     scr->size_x = size_x;
  59.     scr->size_y = size_y;
  60.     scr->style.fg_color = DEFAULT_FOREGROUND_COLOR;
  61.     scr->style.bg_color = DEFAULT_BACKGROUND_COLOR;
  62.    
  63.     screenbuffer_clear(scr);
  64.    
  65.     return scr;
  66. }
  67.  
  68. void screenbuffer_clear(screenbuffer_t *scr)
  69. {
  70.     unsigned int i;
  71.    
  72.     for (i = 0; i < (scr->size_x * scr->size_y); i++) {
  73.         scr->buffer[i].character = ' ';
  74.         scr->buffer[i].style = scr->style;
  75.     }
  76.  
  77.     scr->top_line = 0;
  78.     scr->position_y = 0;
  79.     scr->position_x = 0;
  80. }
  81.  
  82. /** Clear one buffer line
  83.  * @param scr
  84.  * @param line One buffer line (not a screen line!)
  85.  */
  86. void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line)
  87. {
  88.     unsigned int i;
  89.    
  90.     for (i = 0; i < scr->size_x; i++) {
  91.         scr->buffer[i + line*scr->size_x].character = ' ';
  92.         scr->buffer[i + line*scr->size_x].style = scr->style;
  93.     }
  94. }
  95.  
  96. void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest)
  97. {
  98.     unsigned int i;
  99.    
  100.     for (i = 0; i < scr->size_x * scr->size_y; i++) {
  101.         dest[i] = scr->buffer[i];
  102.     }
  103. }
  104.  
  105. void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y)
  106. {
  107.     scr->position_x = x % scr->size_x;
  108.     scr->position_y = y % scr->size_y;
  109. }
  110.  
  111. void screenbuffer_set_style(screenbuffer_t *scr, unsigned int fg_color, unsigned int bg_color)
  112. {
  113.     scr->style.fg_color = fg_color;
  114.     scr->style.bg_color = bg_color;
  115. }
  116.  
  117.