/*
* Copyright (C) 2006 Josef Cejka
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __SCREENBUFFER_H__
#define __SCREENBUFFER_H__
#define DEFAULT_FOREGROUND 0xffff00 /**< default console foreground color */
#define DEFAULT_BACKGROUND 0x000080 /**< default console background color */
typedef struct {
unsigned int bg_color; /**< background color */
unsigned int fg_color; /**< foreground color */
} style_t;
/** One field on screen. It contain one character and its attributes. */
typedef struct {
char character; /**< Character itself */
style_t style; /**< Character`s attributes */
} keyfield_t;
/** Structure for buffering state of one virtual console.
*/
typedef struct {
keyfield_t *buffer; /**< Screen content - characters and its style. Used as cyclyc buffer. */
unsigned int size_x, size_y; /**< Number of columns and rows */
unsigned int position_x, position_y; /**< Coordinates of last printed character for determining cursor position */
style_t style; /**< Current style */
unsigned int top_line; /**< Points to buffer[][] line that will be printed at screen as the first line */
} screenbuffer_t;
/** Returns keyfield for position on screen. Screenbuffer->buffer is cyclic buffer so we must couted in index of the topmost line.
* @param scr screenbuffer
* @oaram x position on screen
* @param y position on screen
* @return keyfield structure with character and its attributes on x,y
*/
static inline keyfield_t *get_field_at(screenbuffer_t *scr, unsigned int x, unsigned int y)
{
return scr->buffer + x + ((y + scr->top_line) % scr->size_y) * scr->size_x;
}
/** Compares two styles.
* @param s1 first style
* @param s2 second style
* @return nonzero on equality
*/
static inline int style_same(style_t s1, style_t s2)
{
return s1.fg_color == s2.fg_color && s1.bg_color == s2.bg_color;
}
void screenbuffer_putchar(screenbuffer_t *scr, char c);
screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y);
void screenbuffer_clear(screenbuffer_t *scr);
void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line);
void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest);
void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y);
void screenbuffer_set_style(screenbuffer_t *scr, unsigned int fg_color, unsigned int bg_color);
#endif