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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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/** @addtogroup console
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 * @{
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 */
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/** @file
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 */
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#ifndef SCREENBUFFER_H__
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#define SCREENBUFFER_H__
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#include <stdint.h>
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#include <sys/types.h>
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#include <bool.h>
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#define DEFAULT_FOREGROUND  0x0       /**< default console foreground color */
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#define DEFAULT_BACKGROUND  0xf0f0f0  /**< default console background color */
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typedef struct {
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    uint8_t style;
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} attr_style_t;
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typedef struct {
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    uint8_t fg_color;
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    uint8_t bg_color;
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    uint8_t flags;
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} attr_idx_t;
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typedef struct {
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    uint32_t bg_color;  /**< background color */
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    uint32_t fg_color;  /**< foreground color */
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} attr_rgb_t;
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typedef struct {
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    enum {
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        at_style,
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        at_idx,
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        at_rgb
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    } t;
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    union {
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        attr_style_t s;
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        attr_idx_t i;
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        attr_rgb_t r;
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    } a;
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} attrs_t;
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/** One field on screen. It contain one character and its attributes. */
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typedef struct {
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    wchar_t character;  /**< Character itself */
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    attrs_t attrs;      /**< Character 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
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                                  their attributes (used as a circular buffer) */
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    size_t size_x;           /**< Number of columns  */
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    size_t size_y;           /**< Number of rows */
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    /** Coordinates of last printed character for determining cursor position */
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    size_t position_x;
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    size_t position_y;
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    attrs_t attrs;           /**< Current attributes. */
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    size_t top_line;         /**< Points to buffer[][] line that will
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                                  be printed at screen as the first line */
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    bool is_cursor_visible;  /**< Cursor state - default is visible */
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} screenbuffer_t;
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/** Returns keyfield for position on screen
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 *
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 * Screenbuffer->buffer is cyclic buffer so we
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 * must couted in index of the topmost line.
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 *
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 * @param scr Screenbuffer
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 * @param x   Position on screen
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 * @param y   Position on screen
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 *
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 * @return Keyfield structure with character and its attributes on x, y
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 *
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 */
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static inline keyfield_t *get_field_at(screenbuffer_t *scr, size_t x, size_t 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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/** Compares two sets of attributes.
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 *
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 * @param s1 First style
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 * @param s2 Second style
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 *
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 * @return Nonzero on equality
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 *
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 */
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static inline int attrs_same(attrs_t a1, attrs_t a2)
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{
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    if (a1.t != a2.t)
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        return 0;
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    switch (a1.t) {
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    case at_style:
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        return (a1.a.s.style == a2.a.s.style);
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    case at_idx:
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        return (a1.a.i.fg_color == a2.a.i.fg_color)
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            && (a1.a.i.bg_color == a2.a.i.bg_color)
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            && (a1.a.i.flags == a2.a.i.flags);
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    case at_rgb:
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        return (a1.a.r.fg_color == a2.a.r.fg_color)
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            && (a1.a.r.bg_color == a2.a.r.bg_color);
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    }
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    return 0;
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}
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void screenbuffer_putchar(screenbuffer_t *scr, wchar_t c);
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screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, size_t size_x, size_t size_y);
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void screenbuffer_clear(screenbuffer_t *scr);
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void screenbuffer_clear_line(screenbuffer_t *scr, size_t 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, size_t x, size_t y);
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void screenbuffer_set_style(screenbuffer_t *scr, uint8_t style);
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void screenbuffer_set_color(screenbuffer_t *scr, uint8_t fg_color,
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    uint8_t bg_color, uint8_t attr);
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void screenbuffer_set_rgb_color(screenbuffer_t *scr, uint32_t fg_color,
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    uint32_t bg_color);
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#endif
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/** @}
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 */