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1487 | cejka | 1 | /* |
2 | * Copyright (C) 2006 Josef Cejka |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
1649 | cejka | 29 | /** @addtogroup console |
30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
1487 | cejka | 35 | #ifndef __SCREENBUFFER_H__ |
36 | #define __SCREENBUFFER_H__ |
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37 | |||
38 | |||
1630 | palkovsky | 39 | #define DEFAULT_FOREGROUND 0x0 /**< default console foreground color */ |
40 | #define DEFAULT_BACKGROUND 0xf0f0f0 /**< default console background color */ |
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1487 | cejka | 41 | |
42 | typedef struct { |
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43 | unsigned int bg_color; /**< background color */ |
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44 | unsigned int fg_color; /**< foreground color */ |
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45 | } style_t; |
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46 | |||
1525 | cejka | 47 | /** One field on screen. It contain one character and its attributes. */ |
1487 | cejka | 48 | typedef struct { |
49 | char character; /**< Character itself */ |
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50 | style_t style; /**< Character`s attributes */ |
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51 | } keyfield_t; |
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52 | |||
53 | /** Structure for buffering state of one virtual console. |
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54 | */ |
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55 | typedef struct { |
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56 | keyfield_t *buffer; /**< Screen content - characters and its style. Used as cyclyc buffer. */ |
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57 | unsigned int size_x, size_y; /**< Number of columns and rows */ |
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58 | unsigned int position_x, position_y; /**< Coordinates of last printed character for determining cursor position */ |
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59 | style_t style; /**< Current style */ |
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60 | unsigned int top_line; /**< Points to buffer[][] line that will be printed at screen as the first line */ |
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1575 | cejka | 61 | unsigned char is_cursor_visible; /**< Cursor state - default is visible */ |
1487 | cejka | 62 | } screenbuffer_t; |
63 | |||
1525 | cejka | 64 | /** Returns keyfield for position on screen. Screenbuffer->buffer is cyclic buffer so we must couted in index of the topmost line. |
65 | * @param scr screenbuffer |
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1649 | cejka | 66 | * @param x position on screen |
1525 | cejka | 67 | * @param y position on screen |
68 | * @return keyfield structure with character and its attributes on x,y |
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69 | */ |
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1487 | cejka | 70 | static inline keyfield_t *get_field_at(screenbuffer_t *scr, unsigned int x, unsigned int y) |
71 | { |
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72 | return scr->buffer + x + ((y + scr->top_line) % scr->size_y) * scr->size_x; |
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73 | } |
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74 | |||
1525 | cejka | 75 | /** Compares two styles. |
76 | * @param s1 first style |
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77 | * @param s2 second style |
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78 | * @return nonzero on equality |
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79 | */ |
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1509 | palkovsky | 80 | static inline int style_same(style_t s1, style_t s2) |
81 | { |
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82 | return s1.fg_color == s2.fg_color && s1.bg_color == s2.bg_color; |
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83 | } |
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1487 | cejka | 84 | |
1509 | palkovsky | 85 | |
1525 | cejka | 86 | void screenbuffer_putchar(screenbuffer_t *scr, char c); |
1487 | cejka | 87 | screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y); |
88 | |||
89 | void screenbuffer_clear(screenbuffer_t *scr); |
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90 | void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line); |
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91 | void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest); |
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92 | void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y); |
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1525 | cejka | 93 | void screenbuffer_set_style(screenbuffer_t *scr, unsigned int fg_color, unsigned int bg_color); |
1487 | cejka | 94 | |
95 | #endif |
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96 | |||
1649 | cejka | 97 | |
98 | /** @} |
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99 | */ |
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100 |