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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_VER;
char dname[] = "Scroll vertical";
char desc[] = "Scroll the screen vertically";
enum Direction { DOWNWARDS = 0, UPWARDS, RANDOM, DIRECTION_NB } Mode_e;
const char *direction_list[DIRECTION_NB] = { "Downwards", "Upwards", "Random" };
#include "scroll.h"
static Pixel_t *save = NULL;
static void
scroll_bt(Context_t *ctx)
{
const Buffer8_t *src = active_buffer(ctx);
Buffer8_t *dst = passive_buffer(ctx);
memcpy((void *)save, (const void *)src->buffer+(BUFFSIZE-WIDTH-1)*sizeof(Pixel_t), WIDTH*sizeof(Pixel_t));
memcpy((void *)(dst->buffer+WIDTH*sizeof(Pixel_t)), (const void *)src->buffer, (BUFFSIZE-WIDTH)*sizeof(Pixel_t));
memcpy((void *)dst->buffer, (const void *)save, WIDTH*sizeof(Pixel_t));
}
static void
scroll_tb(Context_t *ctx)
{
const Buffer8_t *src = active_buffer(ctx);
Buffer8_t *dst = passive_buffer(ctx);
memcpy((void *)save, (const void *)(src->buffer+WIDTH*sizeof(Pixel_t)), WIDTH*sizeof(Pixel_t));
memcpy((void *)dst->buffer, (const void *)(src->buffer+WIDTH*sizeof(Pixel_t)), (BUFFSIZE-WIDTH)*sizeof(Pixel_t));
memcpy((void *)(dst->buffer+(BUFFSIZE-WIDTH-1)*sizeof(Pixel_t)), (const void *)save, WIDTH*sizeof(Pixel_t));
}
static void
set_run_ptr(void)
{
switch (direction) {
case DOWNWARDS:
run_ptr = &scroll_tb;
break;
case UPWARDS:
run_ptr = &scroll_bt;
break;
case RANDOM:
default:
run_ptr = b_rand_boolean() ? &scroll_tb : &scroll_bt;
break;
}
}
int8_t
create(Context_t *ctx)
{
save = xcalloc(WIDTH, sizeof(Pixel_t));
return 1;
}
void
destroy(Context_t *ctx)
{
xfree(save);
}
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