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/*
* Copyright 1994-2022 Olivier Girondel
*
* This file is part of lebiniou.
*
* lebiniou is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* lebiniou is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with lebiniou. If not, see <http://www.gnu.org/licenses/>.
*/
#include "context.h"
uint32_t version = 1;
uint32_t options = BO_DISPLACE | BO_SCROLL | BO_HOR;
char dname[] = "Scroll horizontal";
char desc[] = "Scroll the screen horizontally";
enum Direction { LEFTWARDS = 0, RIGHTWARDS, RANDOM, DIRECTION_NB } Mode_e;
const char *direction_list[DIRECTION_NB] = { "Leftwards", "Rightwards", "Random" };
#include "scroll.h"
static void
scroll_rl(Context_t *ctx)
{
const Buffer8_t *src = active_buffer(ctx);
Buffer8_t *dst = passive_buffer(ctx);
Pixel_t save = src->buffer[0];
memcpy((void *)dst->buffer, (const void *)(src->buffer+sizeof(Pixel_t)), (BUFFSIZE-1)*sizeof(Pixel_t));
dst->buffer[BUFFSIZE-1] = save;
}
static void
scroll_lr(Context_t *ctx)
{
const Buffer8_t *src = active_buffer(ctx);
Buffer8_t *dst = passive_buffer(ctx);
Pixel_t save = src->buffer[BUFFSIZE-1];
memcpy((void *)(dst->buffer+sizeof(Pixel_t)), (const void *)src->buffer, (BUFFSIZE-1)*sizeof(Pixel_t));
dst->buffer[0] = save;
}
static void
set_run_ptr(void)
{
switch (direction) {
case LEFTWARDS:
run_ptr = &scroll_rl;
break;
case RIGHTWARDS:
run_ptr = &scroll_lr;
break;
case RANDOM:
default:
run_ptr = b_rand_boolean() ? &scroll_lr : &scroll_rl;
break;
}
}
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