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#define ENA  0       /* Enable Alpha channel or not */
#define NX   256     /* Number of X points */
#define NY   256     /* Number of Y points */
#define NCH (3+ENA)  /* Number of Channels */

enum Channel { R, G, B, A };
typedef uint8_t Pixel[NCH];

void fun(FILE *fp)
{
    Pixel img[NX][NY];
    unsigned x, y;

    for (x = 0; x < NX; ++x) {
        for (y = 0; y < NY; ++y) {
            img[x][y][R] = x;
            img[x][y][G] = y;
            img[x][y][B] = 128;
        }
    }
    svpng(fp, NX, NY, (unsigned char *) img, ENA);
}

void test(void)
{
	unsigned char rgb[2560 * 1280 * 3], *p = rgb;
	unsigned x, y;
	FILE *fp = fopen("wallpaper.png", "wb");
	for (y = 0; y < 256; ++y)
	{
		for (x = 0; x < 128; ++x)
		{
			*p++ = 128;
			*p++ = 128;
			*p++ = 128;
			*p++ = 128;
		}
	}
	svpng(fp, 2560, 1280, rgb, 1);
	fclose(fp);
}