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| Rev | Author | Line No. | Line |
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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 | |||
| 29 | #ifndef __SCREENBUFFER_H__ |
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| 30 | #define __SCREENBUFFER_H__ |
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| 31 | |||
| 32 | |||
| 1552 | palkovsky | 33 | #define DEFAULT_FOREGROUND 0xffff00 /**< default console foreground color */ |
| 34 | #define DEFAULT_BACKGROUND 0x000080 /**< default console background color */ |
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| 1487 | cejka | 35 | |
| 36 | typedef struct { |
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| 37 | unsigned int bg_color; /**< background color */ |
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| 38 | unsigned int fg_color; /**< foreground color */ |
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| 39 | } style_t; |
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| 40 | |||
| 1525 | cejka | 41 | /** One field on screen. It contain one character and its attributes. */ |
| 1487 | cejka | 42 | typedef struct { |
| 43 | char character; /**< Character itself */ |
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| 44 | style_t style; /**< Character`s attributes */ |
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| 45 | } keyfield_t; |
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| 46 | |||
| 47 | /** Structure for buffering state of one virtual console. |
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| 48 | */ |
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| 49 | typedef struct { |
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| 50 | keyfield_t *buffer; /**< Screen content - characters and its style. Used as cyclyc buffer. */ |
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| 51 | unsigned int size_x, size_y; /**< Number of columns and rows */ |
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| 52 | unsigned int position_x, position_y; /**< Coordinates of last printed character for determining cursor position */ |
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| 53 | style_t style; /**< Current style */ |
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| 54 | unsigned int top_line; /**< Points to buffer[][] line that will be printed at screen as the first line */ |
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| 55 | } screenbuffer_t; |
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| 56 | |||
| 1525 | cejka | 57 | /** Returns keyfield for position on screen. Screenbuffer->buffer is cyclic buffer so we must couted in index of the topmost line. |
| 58 | * @param scr screenbuffer |
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| 59 | * @oaram x position on screen |
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| 60 | * @param y position on screen |
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| 61 | * @return keyfield structure with character and its attributes on x,y |
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| 62 | */ |
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| 1487 | cejka | 63 | static inline keyfield_t *get_field_at(screenbuffer_t *scr, unsigned int x, unsigned int y) |
| 64 | { |
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| 65 | return scr->buffer + x + ((y + scr->top_line) % scr->size_y) * scr->size_x; |
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| 66 | } |
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| 67 | |||
| 1525 | cejka | 68 | /** Compares two styles. |
| 69 | * @param s1 first style |
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| 70 | * @param s2 second style |
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| 71 | * @return nonzero on equality |
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| 72 | */ |
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| 1509 | palkovsky | 73 | static inline int style_same(style_t s1, style_t s2) |
| 74 | { |
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| 75 | return s1.fg_color == s2.fg_color && s1.bg_color == s2.bg_color; |
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| 76 | } |
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| 1487 | cejka | 77 | |
| 1509 | palkovsky | 78 | |
| 1525 | cejka | 79 | void screenbuffer_putchar(screenbuffer_t *scr, char c); |
| 1487 | cejka | 80 | screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y); |
| 81 | |||
| 82 | void screenbuffer_clear(screenbuffer_t *scr); |
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| 83 | void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line); |
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| 84 | void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest); |
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| 85 | void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y); |
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| 1525 | cejka | 86 | void screenbuffer_set_style(screenbuffer_t *scr, unsigned int fg_color, unsigned int bg_color); |
| 1487 | cejka | 87 | |
| 88 | #endif |
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| 89 |