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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    width in characters    
  50.  * @param size_y    height in characters
  51.  * @return pointer to screenbuffer (same as scr parameter) or NULL
  52.  */
  53. screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y)
  54. {
  55.     if ((scr->buffer = (keyfield_t *)malloc(sizeof(keyfield_t) * size_x * size_y)) == NULL) {
  56.         return NULL;
  57.     }
  58.    
  59.     scr->size_x = size_x;
  60.     scr->size_y = size_y;
  61.     scr->style.fg_color = DEFAULT_FOREGROUND;
  62.     scr->style.bg_color = DEFAULT_BACKGROUND;
  63.    
  64.     screenbuffer_clear(scr);
  65.    
  66.     return scr;
  67. }
  68.  
  69. /** Clear screenbuffer.
  70.  * @param scr screenbuffer
  71.  */
  72. void screenbuffer_clear(screenbuffer_t *scr)
  73. {
  74.     unsigned int i;
  75.    
  76.     for (i = 0; i < (scr->size_x * scr->size_y); i++) {
  77.         scr->buffer[i].character = ' ';
  78.         scr->buffer[i].style = scr->style;
  79.     }
  80.  
  81.     scr->top_line = 0;
  82.     scr->position_y = 0;
  83.     scr->position_x = 0;
  84. }
  85.  
  86. /** Clear one buffer line.
  87.  * @param scr
  88.  * @param line One buffer line (not a screen line!)
  89.  */
  90. void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line)
  91. {
  92.     unsigned int i;
  93.    
  94.     for (i = 0; i < scr->size_x; i++) {
  95.         scr->buffer[i + line*scr->size_x].character = ' ';
  96.         scr->buffer[i + line*scr->size_x].style = scr->style;
  97.     }
  98. }
  99.  
  100. /** Copy content buffer from screenbuffer to given memory.
  101.  * @param scr   source screenbuffer
  102.  * @param dest  destination
  103.  */
  104. void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest)
  105. {
  106.     unsigned int i;
  107.    
  108.     for (i = 0; i < scr->size_x * scr->size_y; i++) {
  109.         dest[i] = scr->buffer[i];
  110.     }
  111. }
  112.  
  113. /** Set new cursor position in screenbuffer.
  114.  * @param scr
  115.  * @param x
  116.  * @param y
  117.  */
  118. void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y)
  119. {
  120.     scr->position_x = x % scr->size_x;
  121.     scr->position_y = y % scr->size_y;
  122. }
  123.  
  124. /** Set new style.
  125.  * @param scr
  126.  * @param fg_color
  127.  * @param bg_color
  128.  */
  129. void screenbuffer_set_style(screenbuffer_t *scr, unsigned int fg_color, unsigned int bg_color)
  130. {
  131.     scr->style.fg_color = fg_color;
  132.     scr->style.bg_color = bg_color;
  133. }
  134.  
  135.