momento/src/transition/fade.c

/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Copyright (C) 2021 KikooDX */

#include "transition.h"
#include "util.h"
#include "zxcolors.h"
#include <gint/display.h>

void
hfade_in(float step, color_t color)
{
	int line = isquare(step) * DWIDTH;
	int x;
	drect(line, 0, DWIDTH, DHEIGHT, ZX_BLACK);
	for (x = line; x < line + 2; x += 1) {
		dvline(x, color);
	}
}

void
hfade_out(float step, color_t color)
{
	int line = square(step) * DWIDTH;
	int x;
	drect(0, 0, line, DHEIGHT, ZX_BLACK);
	for (x = line - 2; x < line; x += 1) {
		dvline(x, color);
	}
}

void
vfade_in(float step, color_t color)
{
	int line = isquare(step) * DHEIGHT;
	int y;
	drect(0, line, DWIDTH, DHEIGHT, ZX_BLACK);
	for (y = line; y < line + 2; y += 1) {
		dhline(y, color);
	}
}

void
vfade_out(float step, color_t color)
{
	int line = square(step) * DHEIGHT;
	int y;
	drect(0, 0, DWIDTH, line, ZX_BLACK);
	for (y = line - 2; y < line; y += 1) {
		dhline(y, color);
	}
}