@@ -93,9 +93,10 @@ static int

 writebmp(int w, int h, u32int *p)

 {

 	/* clang-format off */

+	int sz = 14 + 40 + 4*4 + 4*w*h;

 	u8int hd[14+40+4*4] = {

 		'B', 'M',

-		0, 0, 0, 0, /* file size */

+		sz, sz>>8, sz>>16, sz>>24, /* file size */

 		0, 0,

 		0, 0,

 		14+40+4*4, 0, 0, 0, /* pixel data offset */

@@ -110,20 +111,13 @@ writebmp(int w, int h, u32int *p)

 		0, 0, 0, 0, /* dummy ver ppm */

 		0, 0, 0, 0, /* dummy num of colors */

 		0, 0, 0, 0, /* dummy important colors */

-		0, 0, 0, 0xff,

-		0, 0, 0xff, 0,

-		0, 0xff, 0, 0,

-		0xff, 0, 0, 0,

+		0, 0, 0, 0xff, /* R mask */

+		0, 0, 0xff, 0, /* G mask */

+		0, 0xff, 0, 0, /* B mask */

+		0xff, 0, 0, 0, /* A mask */

 	};

-	int sz;

 	/* clang-format on */

-	sz = 14 + 40 + 4 * 4 + 4 * w * h;

-	hd[2] = sz;

-	hd[3] = sz >> 8;

-	hd[4] = sz >> 16;

-	hd[5] = sz >> 24;

-

 	write(1, hd, sizeof(hd));

 	while(h-- >= 0)

 		write(1, p + w * h, 4 * w);