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/* |
* 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. |
*/ |
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/** @addtogroup console |
* @{ |
*/ |
/** @file |
*/ |
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#ifndef __SCREENBUFFER_H__ |
#define __SCREENBUFFER_H__ |
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#include <stdint.h> |
#include <sys/types.h> |
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#define DEFAULT_FOREGROUND 0x0 /**< default console foreground color */ |
#define DEFAULT_BACKGROUND 0xf0f0f0 /**< default console background color */ |
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typedef struct { |
uint8_t style; |
} attr_style_t; |
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typedef struct { |
uint8_t fg_color; |
uint8_t bg_color; |
uint8_t flags; |
} attr_idx_t; |
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typedef struct { |
uint32_t bg_color; /**< background color */ |
uint32_t fg_color; /**< foreground color */ |
} attr_rgb_t; |
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typedef struct { |
enum { |
at_style, |
at_idx, |
at_rgb |
} t; |
union { |
attr_style_t s; |
attr_idx_t i; |
attr_rgb_t r; |
} a; |
} attrs_t; |
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/** One field on screen. It contain one character and its attributes. */ |
typedef struct { |
wchar_t character; /**< Character itself */ |
attrs_t attrs; /**< Character`s attributes */ |
} keyfield_t; |
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/** Structure for buffering state of one virtual console. |
*/ |
typedef struct { |
keyfield_t *buffer; /**< Screen content - characters and their attributes. Used as a circular 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 */ |
attrs_t attrs; /**< Current attributes. */ |
unsigned int top_line; /**< Points to buffer[][] line that will be printed at screen as the first line */ |
unsigned char is_cursor_visible; /**< Cursor state - default is visible */ |
} screenbuffer_t; |
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/** Returns keyfield for position on screen. Screenbuffer->buffer is cyclic buffer so we must couted in index of the topmost line. |
* @param scr screenbuffer |
* @param 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; |
} |
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/** Compares two sets of attributes. |
* @param s1 first style |
* @param s2 second style |
* @return nonzero on equality |
*/ |
static inline int attrs_same(attrs_t a1, attrs_t a2) |
{ |
if (a1.t != a2.t) return 0; |
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switch (a1.t) { |
case at_style: return a1.a.s.style == a2.a.s.style; |
case at_idx: return a1.a.i.fg_color == a2.a.i.fg_color && |
a1.a.i.bg_color == a2.a.i.bg_color && |
a1.a.i.flags == a2.a.i.flags; |
case at_rgb: return a1.a.r.fg_color == a2.a.r.fg_color && |
a1.a.r.bg_color == a2.a.r.bg_color; |
} |
} |
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void screenbuffer_putchar(screenbuffer_t *scr, wchar_t c); |
screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y); |
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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, int style); |
void screenbuffer_set_color(screenbuffer_t *scr, unsigned int fg_color, |
unsigned int bg_color, unsigned int attr); |
void screenbuffer_set_rgb_color(screenbuffer_t *scr, unsigned int fg_color, |
unsigned int bg_color); |
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#endif |
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/** @} |
*/ |
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