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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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#include <screenbuffer.h>
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#include <malloc.h>
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#include <unistd.h>
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/** Store one character to screenbuffer. Its position is determined by
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 * scr->position_x and scr->position_y.
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 *
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 * @param scr   screenbuffer
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 * @param c stored character
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 */
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void screenbuffer_putchar(screenbuffer_t *scr, char c)
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{
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    keyfield_t *field;
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    field = get_field_at(scr, scr->position_x, scr->position_y);
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    field->character = c;
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    field->style = scr->style;
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}
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/** Initilize screenbuffer. Allocate space for screen content in accordance to given size.
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 * @param scr       initialized screenbuffer
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 * @param size_x    width in characters    
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 * @param size_y    height in characters
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 * @return pointer to screenbuffer (same as scr parameter) or NULL
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 */
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screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y)
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{
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    scr->buffer = (keyfield_t *) malloc(sizeof(keyfield_t) * size_x * size_y);
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    if (!scr->buffer) {
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        return NULL;
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    }
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    scr->size_x = size_x;
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    scr->size_y = size_y;
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    scr->style.fg_color = DEFAULT_FOREGROUND;
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    scr->style.bg_color = DEFAULT_BACKGROUND;
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    scr->is_cursor_visible = 1;
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    screenbuffer_clear(scr);
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    return scr;
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}
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/** Clear screenbuffer.
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 * @param scr screenbuffer
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 */
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void screenbuffer_clear(screenbuffer_t *scr)
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{
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    unsigned int i;
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    for (i = 0; i < (scr->size_x * scr->size_y); i++) {
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        scr->buffer[i].character = ' ';
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        scr->buffer[i].style = scr->style;
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    }
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    scr->top_line = 0;
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    scr->position_y = 0;
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    scr->position_x = 0;
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}
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/** Clear one buffer line.
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 * @param scr
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 * @param line One buffer line (not a screen line!)
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 */
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void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line)
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{
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    unsigned int i;
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    for (i = 0; i < scr->size_x; i++) {
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        scr->buffer[i + line * scr->size_x].character = ' ';
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        scr->buffer[i + line * scr->size_x].style = scr->style;
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    }
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}
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/** Copy content buffer from screenbuffer to given memory.
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 * @param scr   source screenbuffer
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 * @param dest  destination
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 */
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void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest)
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{
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    unsigned int i;
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    for (i = 0; i < scr->size_x * scr->size_y; i++) {
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        dest[i] = scr->buffer[i];
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    }
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}
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/** Set new cursor position in screenbuffer.
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 * @param scr
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 * @param x
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 * @param y
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 */
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void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y)
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{
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    scr->position_x = x % scr->size_x;
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    scr->position_y = y % scr->size_y;
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}
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/** Set new style.
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 * @param scr
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 * @param fg_color
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 * @param bg_color
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 */
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void screenbuffer_set_style(screenbuffer_t *scr, unsigned int fg_color, unsigned int bg_color)
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{
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    scr->style.fg_color = fg_color;
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    scr->style.bg_color = bg_color;
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}
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/** @}
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 */