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1487 cejka 1 
/*
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 * Copyright (C) 2006 Josef Cejka
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __SCREENBUFFER_H__
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#define __SCREENBUFFER_H__
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#define DEFAULT_FOREGROUND_COLOR 0xffffff
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#define DEFAULT_BACKGROUND_COLOR 0x00003f
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typedef struct {
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    unsigned int bg_color;      /**< background color */
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    unsigned int fg_color;      /**< foreground color */
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} style_t;
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/** One field at screen. It contain one character and its attributes. */
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typedef struct {
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    char character;         /**< Character itself */
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    style_t style;          /**< Character`s attributes */
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} keyfield_t;
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/** Structure for buffering state of one virtual console.
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 */
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typedef struct {
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    keyfield_t *buffer;         /**< Screen content - characters and its style. Used as cyclyc buffer. */
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    unsigned int size_x, size_y;        /**< Number of columns and rows */
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    unsigned int position_x, position_y;    /**< Coordinates of last printed character for determining cursor position */
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    style_t style;              /**< Current style */
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    unsigned int top_line;          /**< Points to buffer[][] line that will be printed at screen as the first line */
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} screenbuffer_t;
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static inline keyfield_t *get_field_at(screenbuffer_t *scr, unsigned int x, unsigned int y)
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{
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    return scr->buffer + x + ((y + scr->top_line) % scr->size_y) * scr->size_x;
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}
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static inline int style_same(style_t s1, style_t s2)
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{
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    return s1.fg_color == s2.fg_color && s1.bg_color == s2.bg_color;
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}
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int screenbuffer_putchar(screenbuffer_t *scr, char c);
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screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y);
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void screenbuffer_clear(screenbuffer_t *scr);
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void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line);
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void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest);
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void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y);
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#endif
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