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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.     scr->position_x++;
  47.     if (scr->position_x == scr->size_x) {
  48.         scr->position_x = 0;
  49.         scr->position_y++;
  50.         if (scr->position_y == scr->size_y) {
  51.             /* scroll */
  52.             scr->position_y--;
  53.             screenbuffer_clear_line(scr, scr->top_line++);
  54.         }
  55.     }
  56.    
  57.     return 1;
  58. }
  59.  
  60. screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y)
  61. {
  62.     if ((scr->buffer = (keyfield_t *)malloc(sizeof(keyfield_t) * size_x * size_y)) == NULL) {
  63.         return NULL;
  64.     }
  65.    
  66.     scr->size_x = size_x;
  67.     scr->size_y = size_y;
  68.     scr->position_y = 0;
  69.     scr->position_x = 0;
  70.     scr->style.fg_color = DEFAULT_FOREGROUND_COLOR;
  71.     scr->style.bg_color = DEFAULT_BACKGROUND_COLOR;
  72.     scr->top_line = 0;
  73.     return scr;
  74. }
  75.  
  76. void screenbuffer_clear(screenbuffer_t *scr)
  77. {
  78.     unsigned int i;
  79.    
  80.     for (i = 0; i < scr->size_x * scr->size_y; i++) {
  81.         scr->buffer[i].character = ' ';
  82.         scr->buffer[i].style = scr->style;
  83.     }
  84.  
  85.     scr->top_line = 0;
  86.     scr->position_y = 0;
  87.     scr->position_x = 0;
  88. }
  89.  
  90. /** Clear one buffer line
  91.  * @param scr
  92.  * @param line One buffer line (not a screen line!)
  93.  */
  94. void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line)
  95. {
  96.     unsigned int i;
  97.    
  98.     for (i = 0; i < scr->size_x; i++) {
  99.         scr->buffer[i + line*scr->size_x].character = ' ';
  100.         scr->buffer[i + line*scr->size_x].style = scr->style;
  101.     }
  102. }
  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. void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y)
  114. {
  115.     scr->position_x = x % scr->size_x;
  116.     scr->position_y = (y + scr->top_line) % scr->size_y;
  117. }
  118.  
  119.