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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. #ifndef __SCREENBUFFER_H__
  30. #define __SCREENBUFFER_H__
  31.  
  32.  
  33. #define DEFAULT_FOREGROUND_COLOR 0xffffff
  34. #define DEFAULT_BACKGROUND_COLOR 0x00003f
  35.  
  36. typedef struct {
  37.     unsigned int bg_color;      /**< background color */
  38.     unsigned int fg_color;      /**< foreground color */
  39. } style_t;
  40.  
  41. /** One field at screen. It contain one character and its attributes. */
  42. typedef struct {
  43.     char character;         /**< Character itself */
  44.     style_t style;          /**< Character`s attributes */
  45. } keyfield_t;
  46.  
  47. /** Structure for buffering state of one virtual console.
  48.  */
  49. typedef struct {
  50.     keyfield_t *buffer;         /**< Screen content - characters and its style. Used as cyclyc buffer. */
  51.     unsigned int size_x, size_y;        /**< Number of columns and rows */
  52.     unsigned int position_x, position_y;    /**< Coordinates of last printed character for determining cursor position */
  53.     style_t style;              /**< Current style */
  54.     unsigned int top_line;          /**< Points to buffer[][] line that will be printed at screen as the first line */
  55. } screenbuffer_t;
  56.  
  57. static inline keyfield_t *get_field_at(screenbuffer_t *scr, unsigned int x, unsigned int y)
  58. {
  59.     return scr->buffer + x + ((y + scr->top_line) % scr->size_y) * scr->size_x;
  60. }
  61.  
  62.  
  63. int screenbuffer_putchar(screenbuffer_t *scr, char c);
  64. screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y);
  65.  
  66. void screenbuffer_clear(screenbuffer_t *scr);
  67. void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line);
  68. void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest);
  69. void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y);
  70.  
  71. #endif
  72.  
  73.