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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. /** Get field from buffer that corresponds to character at position x,y at screen
  34.  *
  35.  */
  36.  
  37. int 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.     return 1;
  47. }
  48.  
  49. screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y)
  50. {
  51.     if ((scr->buffer = (keyfield_t *)malloc(sizeof(keyfield_t) * size_x * size_y)) == NULL) {
  52.         return NULL;
  53.     }
  54.    
  55.     scr->size_x = size_x;
  56.     scr->size_y = size_y;
  57.     scr->style.fg_color = DEFAULT_FOREGROUND_COLOR;
  58.     scr->style.bg_color = DEFAULT_BACKGROUND_COLOR;
  59.    
  60.     screenbuffer_clear(scr);
  61.    
  62.     return scr;
  63. }
  64.  
  65. void screenbuffer_clear(screenbuffer_t *scr)
  66. {
  67.     unsigned int i;
  68.    
  69.     for (i = 0; i < (scr->size_x * scr->size_y); i++) {
  70.         scr->buffer[i].character = ' ';
  71.         scr->buffer[i].style = scr->style;
  72.     }
  73.  
  74.     scr->top_line = 0;
  75.     scr->position_y = 0;
  76.     scr->position_x = 0;
  77. }
  78.  
  79. /** Clear one buffer line
  80.  * @param scr
  81.  * @param line One buffer line (not a screen line!)
  82.  */
  83. void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line)
  84. {
  85.     unsigned int i;
  86.    
  87.     for (i = 0; i < scr->size_x; i++) {
  88.         scr->buffer[i + line*scr->size_x].character = ' ';
  89.         scr->buffer[i + line*scr->size_x].style = scr->style;
  90.     }
  91. }
  92.  
  93. void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest)
  94. {
  95.     unsigned int i;
  96.    
  97.     for (i = 0; i < scr->size_x * scr->size_y; i++) {
  98.         dest[i] = scr->buffer[i];
  99.     }
  100. }
  101.  
  102. void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y)
  103. {
  104.     scr->position_x = x % scr->size_x;
  105.     scr->position_y = y  % scr->size_y;
  106. }
  107.  
  108.