WebSVN – HelenOS – Blame – //branches/dd/uspace/srv/console/screenbuffer.h

Rev	Author	Line No.	Line
4419	trochtova	1	/*
		2	* Copyright (c) 2006 Josef Cejka
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
		29	/** @addtogroup console
4439	trochtova	30	* @{
4419	trochtova	31	*/
		32	/** @file
		33	*/
		34
4439	trochtova	35	#ifndef SCREENBUFFER_H__
		36	#define SCREENBUFFER_H__
4419	trochtova	37
		38	#include <stdint.h>
		39	#include <sys/types.h>
		40
4439	trochtova	41	#define DEFAULT_FOREGROUND 0x0 /*< default console foreground color /
		42	#define DEFAULT_BACKGROUND 0xf0f0f0 /*< default console background color /
4419	trochtova	43
		44	typedef struct {
		45	uint8_t style;
		46	} attr_style_t;
		47
		48	typedef struct {
		49	uint8_t fg_color;
		50	uint8_t bg_color;
		51	uint8_t flags;
		52	} attr_idx_t;
		53
		54	typedef struct {
4439	trochtova	55	uint32_t bg_color; /*< background color /
		56	uint32_t fg_color; /*< foreground color /
4419	trochtova	57	} attr_rgb_t;
		58
		59	typedef struct {
		60	enum {
		61	at_style,
		62	at_idx,
		63	at_rgb
		64	} t;
		65	union {
		66	attr_style_t s;
		67	attr_idx_t i;
		68	attr_rgb_t r;
4439	trochtova	69	} a;
4419	trochtova	70	} attrs_t;
		71
		72	/** One field on screen. It contain one character and its attributes. */
		73	typedef struct {
4439	trochtova	74	wchar_t character; /*< Character itself /
		75	attrs_t attrs; /*< Character`s attributes /
4419	trochtova	76	} keyfield_t;
		77
		78	/** Structure for buffering state of one virtual console.
		79	*/
		80	typedef struct {
4439	trochtova	81	keyfield_t buffer; /*< Screen content - characters and
		82	their attributes (used as a circular buffer) */
		83	unsigned int size_x; /*< Number of columns /
		84	unsigned int size_y; /*< Number of rows /
		85
		86	/** Coordinates of last printed character for determining cursor position */
		87	unsigned int position_x;
		88	unsigned int position_y;
		89
		90	attrs_t attrs; /*< Current attributes. /
		91	unsigned int top_line; /**< Points to buffer[][] line that will
		92	be printed at screen as the first line */
		93	unsigned char is_cursor_visible; /*< Cursor state - default is visible /
4419	trochtova	94	} screenbuffer_t;
		95
4439	trochtova	96	/** Returns keyfield for position on screen
		97	*
		98	* Screenbuffer->buffer is cyclic buffer so we
		99	* must couted in index of the topmost line.
		100	*
		101	* @param scr Screenbuffer
		102	* @param x Position on screen
		103	* @param y Position on screen
		104	*
		105	* @return Keyfield structure with character and its attributes on x, y
		106	*
4419	trochtova	107	*/
		108	static inline keyfield_t get_field_at(screenbuffer_t scr, unsigned int x, unsigned int y)
		109	{
		110	return scr->buffer + x + ((y + scr->top_line) % scr->size_y) * scr->size_x;
		111	}
		112
		113	/** Compares two sets of attributes.
4439	trochtova	114	*
		115	* @param s1 First style
		116	* @param s2 Second style
		117	*
		118	* @return Nonzero on equality
		119	*
4419	trochtova	120	*/
		121	static inline int attrs_same(attrs_t a1, attrs_t a2)
		122	{
4439	trochtova	123	if (a1.t != a2.t)
		124	return 0;
		125
4419	trochtova	126	switch (a1.t) {
4439	trochtova	127	case at_style:
		128	return (a1.a.s.style == a2.a.s.style);
		129	case at_idx:
		130	return (a1.a.i.fg_color == a2.a.i.fg_color)
		131	&& (a1.a.i.bg_color == a2.a.i.bg_color)
		132	&& (a1.a.i.flags == a2.a.i.flags);
		133	case at_rgb:
		134	return (a1.a.r.fg_color == a2.a.r.fg_color)
		135	&& (a1.a.r.bg_color == a2.a.r.bg_color);
4419	trochtova	136	}
		137	}
		138
		139
		140	void screenbuffer_putchar(screenbuffer_t *scr, wchar_t c);
		141	screenbuffer_t screenbuffer_init(screenbuffer_t scr, int size_x, int size_y);
		142
		143	void screenbuffer_clear(screenbuffer_t *scr);
		144	void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line);
		145	void screenbuffer_copy_buffer(screenbuffer_t scr, keyfield_t dest);
		146	void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y);
		147	void screenbuffer_set_style(screenbuffer_t *scr, int style);
		148	void screenbuffer_set_color(screenbuffer_t *scr, unsigned int fg_color,
		149	unsigned int bg_color, unsigned int attr);
		150	void screenbuffer_set_rgb_color(screenbuffer_t *scr, unsigned int fg_color,
		151	unsigned int bg_color);
		152
		153	#endif
		154
		155	/** @}
		156	*/

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