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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. #ifndef SCREENBUFFER_H__
  36. #define SCREENBUFFER_H__
  37.  
  38. #include <stdint.h>
  39. #include <sys/types.h>
  40. #include <bool.h>
  41.  
  42. #define DEFAULT_FOREGROUND  0x0       /**< default console foreground color */
  43. #define DEFAULT_BACKGROUND  0xf0f0f0  /**< default console background color */
  44.  
  45. typedef struct {
  46.     uint8_t style;
  47. } attr_style_t;
  48.  
  49. typedef struct {
  50.     uint8_t fg_color;
  51.     uint8_t bg_color;
  52.     uint8_t flags;
  53. } attr_idx_t;
  54.  
  55. typedef struct {
  56.     uint32_t bg_color;  /**< background color */
  57.     uint32_t fg_color;  /**< foreground color */
  58. } attr_rgb_t;
  59.  
  60. typedef struct {
  61.     enum {
  62.         at_style,
  63.         at_idx,
  64.         at_rgb
  65.     } t;
  66.     union {
  67.         attr_style_t s;
  68.         attr_idx_t i;
  69.         attr_rgb_t r;
  70.     } a;
  71. } attrs_t;
  72.  
  73. /** One field on screen. It contain one character and its attributes. */
  74. typedef struct {
  75.     wchar_t character;  /**< Character itself */
  76.     attrs_t attrs;      /**< Character attributes */
  77. } keyfield_t;
  78.  
  79. /** Structure for buffering state of one virtual console.
  80.  */
  81. typedef struct {
  82.     keyfield_t *buffer;      /**< Screen content - characters and
  83.                                   their attributes (used as a circular buffer) */
  84.     size_t size_x;           /**< Number of columns  */
  85.     size_t size_y;           /**< Number of rows */
  86.    
  87.     /** Coordinates of last printed character for determining cursor position */
  88.     size_t position_x;
  89.     size_t position_y;
  90.    
  91.     attrs_t attrs;           /**< Current attributes. */
  92.     size_t top_line;         /**< Points to buffer[][] line that will
  93.                                   be printed at screen as the first line */
  94.     bool is_cursor_visible;  /**< Cursor state - default is visible */
  95. } screenbuffer_t;
  96.  
  97. /** Returns keyfield for position on screen
  98.  *
  99.  * Screenbuffer->buffer is cyclic buffer so we
  100.  * must couted in index of the topmost line.
  101.  *
  102.  * @param scr Screenbuffer
  103.  * @param x   Position on screen
  104.  * @param y   Position on screen
  105.  *
  106.  * @return Keyfield structure with character and its attributes on x, y
  107.  *
  108.  */
  109. static inline keyfield_t *get_field_at(screenbuffer_t *scr, size_t x, size_t y)
  110. {
  111.     return scr->buffer + x + ((y + scr->top_line) % scr->size_y) * scr->size_x;
  112. }
  113.  
  114. /** Compares two sets of attributes.
  115.  *
  116.  * @param s1 First style
  117.  * @param s2 Second style
  118.  *
  119.  * @return Nonzero on equality
  120.  *
  121.  */
  122. static inline int attrs_same(attrs_t a1, attrs_t a2)
  123. {
  124.     if (a1.t != a2.t)
  125.         return 0;
  126.    
  127.     switch (a1.t) {
  128.     case at_style:
  129.         return (a1.a.s.style == a2.a.s.style);
  130.     case at_idx:
  131.         return (a1.a.i.fg_color == a2.a.i.fg_color)
  132.             && (a1.a.i.bg_color == a2.a.i.bg_color)
  133.             && (a1.a.i.flags == a2.a.i.flags);
  134.     case at_rgb:
  135.         return (a1.a.r.fg_color == a2.a.r.fg_color)
  136.             && (a1.a.r.bg_color == a2.a.r.bg_color);
  137.     }
  138.    
  139.     return 0;
  140. }
  141.  
  142.  
  143. void screenbuffer_putchar(screenbuffer_t *scr, wchar_t c);
  144. screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, size_t size_x, size_t size_y);
  145.  
  146. void screenbuffer_clear(screenbuffer_t *scr);
  147. void screenbuffer_clear_line(screenbuffer_t *scr, size_t line);
  148. void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest);
  149. void screenbuffer_goto(screenbuffer_t *scr, size_t x, size_t y);
  150. void screenbuffer_set_style(screenbuffer_t *scr, uint8_t style);
  151. void screenbuffer_set_color(screenbuffer_t *scr, uint8_t fg_color,
  152.     uint8_t bg_color, uint8_t attr);
  153. void screenbuffer_set_rgb_color(screenbuffer_t *scr, uint32_t fg_color,
  154.     uint32_t bg_color);
  155.  
  156. #endif
  157.  
  158. /** @}
  159.  */
  160.