picture.c

/*
 * Copyright (c) 2014 Manuel Braga <mul.braga@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include "vepoc.h"

void picture_generate(uint32_t w, uint32_t h, uint8_t *Y, uint8_t *C)
{
	int x;
	int y;
	int b;
	int m;
	int w2 = w / 2;
	int w4 = w / 4;

	for(y = 0; y < h; y++)
		for(x = 0; x < w; x++)
		{
			b = w * y + x;
			m = y / 16;
			if(x % 16 && y % 16)
				if(m < 12)
					Y[b] = 0x10 + 0x30 * (x / w4);
				else
					Y[b] = 0x20 + 0xc0 * x / w;
			else
				Y[b] = 0xf0;
		}
	
	for(y = 0; y < h; y++)
		for(x = 0; x < w; x++)
		{
			b = w * y + x;
			m = y / 16;
			if(m < 4)
				C[b] = 0x80;
			else if(m == 4)
				if(x / w2)
					C[b] = (x % 2) ? 0x30 : 0xc0;
				else
					C[b] = (x % 2) ? 0xc0 : 0x30;
			else if(m == 5)
				if(x / w2)
					C[b] = (x % 2) ? 0x80 : 0x10;
				else
					C[b] = (x % 2) ? 0x80 : 0xf0;
			else
				C[b] = 0x20 + 0xc0 * x / w;
		}
}