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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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#include <screenbuffer.h>
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#include <malloc.h>
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#include <unistd.h>
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/** Get field from buffer that corresponds to character at position x,y at screen
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 *
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 */
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int 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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    scr->position_x++;
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    if (scr->position_x == scr->size_x) {
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        scr->position_x = 0;
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        scr->position_y++;
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        if (scr->position_y == scr->size_y) {
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            /* scroll */
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            scr->position_y--;
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            screenbuffer_clear_line(scr, scr->top_line++);
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        }
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    }
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    return 1;
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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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    if ((scr->buffer = (keyfield_t *)malloc(sizeof(keyfield_t) * size_x * size_y)) == NULL) {
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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->position_y = 0;
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    scr->position_x = 0;
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    scr->style.fg_color = DEFAULT_FOREGROUND_COLOR;
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    scr->style.bg_color = DEFAULT_BACKGROUND_COLOR;
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    scr->top_line = 0;
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    return scr;
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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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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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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->top_line) % scr->size_y;
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}
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