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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. /** @addtogroup console
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <screenbuffer.h>
  36. #include <malloc.h>
  37. #include <unistd.h>
  38.  
  39. /** Store one character to screenbuffer. Its position is determined by scr->position_x and scr->position_y.
  40.  * @param scr   screenbuffer
  41.  * @param c stored character
  42.  */
  43. void screenbuffer_putchar(screenbuffer_t *scr, char c)
  44. {
  45.     keyfield_t *field;
  46.    
  47.     field = get_field_at(scr, scr->position_x, scr->position_y);
  48.  
  49.     field->character = c;
  50.     field->style = scr->style;
  51. }
  52.  
  53. /** Initilize screenbuffer. Allocate space for screen content in accordance to given size.
  54.  * @param scr       initialized screenbuffer
  55.  * @param size_x    width in characters    
  56.  * @param size_y    height in characters
  57.  * @return pointer to screenbuffer (same as scr parameter) or NULL
  58.  */
  59. screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y)
  60. {
  61.     if ((scr->buffer = (keyfield_t *)malloc(sizeof(keyfield_t) * size_x * size_y)) == NULL) {
  62.         return NULL;
  63.     }
  64.    
  65.     scr->size_x = size_x;
  66.     scr->size_y = size_y;
  67.     scr->style.fg_color = DEFAULT_FOREGROUND;
  68.     scr->style.bg_color = DEFAULT_BACKGROUND;
  69.     scr->is_cursor_visible = 1;
  70.    
  71.     screenbuffer_clear(scr);
  72.    
  73.     return scr;
  74. }
  75.  
  76. /** Clear screenbuffer.
  77.  * @param scr screenbuffer
  78.  */
  79. void screenbuffer_clear(screenbuffer_t *scr)
  80. {
  81.     unsigned int i;
  82.    
  83.     for (i = 0; i < (scr->size_x * scr->size_y); i++) {
  84.         scr->buffer[i].character = ' ';
  85.         scr->buffer[i].style = scr->style;
  86.     }
  87.  
  88.     scr->top_line = 0;
  89.     scr->position_y = 0;
  90.     scr->position_x = 0;
  91. }
  92.  
  93. /** Clear one buffer line.
  94.  * @param scr
  95.  * @param line One buffer line (not a screen line!)
  96.  */
  97. void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line)
  98. {
  99.     unsigned int i;
  100.    
  101.     for (i = 0; i < scr->size_x; i++) {
  102.         scr->buffer[i + line*scr->size_x].character = ' ';
  103.         scr->buffer[i + line*scr->size_x].style = scr->style;
  104.     }
  105. }
  106.  
  107. /** Copy content buffer from screenbuffer to given memory.
  108.  * @param scr   source screenbuffer
  109.  * @param dest  destination
  110.  */
  111. void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest)
  112. {
  113.     unsigned int i;
  114.    
  115.     for (i = 0; i < scr->size_x * scr->size_y; i++) {
  116.         dest[i] = scr->buffer[i];
  117.     }
  118. }
  119.  
  120. /** Set new cursor position in screenbuffer.
  121.  * @param scr
  122.  * @param x
  123.  * @param y
  124.  */
  125. void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y)
  126. {
  127.     scr->position_x = x % scr->size_x;
  128.     scr->position_y = y % scr->size_y;
  129. }
  130.  
  131. /** Set new style.
  132.  * @param scr
  133.  * @param fg_color
  134.  * @param bg_color
  135.  */
  136. void screenbuffer_set_style(screenbuffer_t *scr, unsigned int fg_color, unsigned int bg_color)
  137. {
  138.     scr->style.fg_color = fg_color;
  139.     scr->style.bg_color = bg_color;
  140. }
  141.  
  142.  
  143. /** @}
  144.  */
  145.  
  146.