From f15f3836e13cc132ea67202a74cf85847ccccabb Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Wed, 25 Sep 2019 18:31:40 +0200
Subject: [PATCH] make natool write full-width chroma PGMYUV

---
 src/frmwriter.rs | 58 ++++++++++++++++++++++++++++++++++--------------
 1 file changed, 41 insertions(+), 17 deletions(-)

diff --git a/src/frmwriter.rs b/src/frmwriter.rs
index 53acdb9..6ae92bc 100644
--- a/src/frmwriter.rs
+++ b/src/frmwriter.rs
@@ -12,18 +12,20 @@ pub fn write_pgmyuv(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
     let is_flipped = buf.get_info().is_flipped();
     let (w, h) = buf.get_dimensions(0);
     let (w2, h2) = buf.get_dimensions(1);
+    let full_w = w2 * 2 > w;
     let has_alpha = buf.get_info().get_format().has_alpha();
-    let tot_h;
+    let mut tot_h = h + h2;
     if has_alpha {
-        tot_h = h * 2 + h2;
-    } else {
-        tot_h = h + h2;
+        tot_h += h;
+    }
+    if full_w {
+        tot_h += h2;
     }
     let hdr = format!("P5\n{} {}\n255\n", w, tot_h);
     ofile.write_all(hdr.as_bytes()).unwrap();
     let dta = buf.get_data();
     let ls = buf.get_stride(0);
-    let pad: Vec<u8> = vec![0xFF; (w - w2 * 2) / 2];
+    let pad: Vec<u8> = vec![0xFF; if !full_w { (w - w2 * 2) / 2 } else { w - w2 } ];
     if !is_flipped {
         let ylines = dta.chunks(ls).take(h);
         for line in ylines {
@@ -41,21 +43,43 @@ pub fn write_pgmyuv(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
     let stride2 = buf.get_stride(2);
     let u = &dta[base1..][..h2*stride1];
     let v = &dta[base2..][..h2*stride2];
-    if !is_flipped {
-        for (uline, vline) in u.chunks(stride1).zip(v.chunks(stride2)) {
-            ofile.write_all(&uline[..w2]).unwrap();
-            ofile.write_all(pad.as_slice()).unwrap();
+    if !full_w {
+        if !is_flipped {
+            for (uline, vline) in u.chunks(stride1).zip(v.chunks(stride2)) {
+                ofile.write_all(&uline[..w2]).unwrap();
+                ofile.write_all(pad.as_slice()).unwrap();
 
-            ofile.write_all(&vline[..w2]).unwrap();
-            ofile.write_all(pad.as_slice()).unwrap();
+                ofile.write_all(&vline[..w2]).unwrap();
+                ofile.write_all(pad.as_slice()).unwrap();
+            }
+        } else {
+            for (uline, vline) in u.chunks(stride1).rev().zip(v.chunks(stride2).rev()) {
+                ofile.write_all(&uline[..w2]).unwrap();
+                ofile.write_all(pad.as_slice()).unwrap();
+
+                ofile.write_all(&vline[..w2]).unwrap();
+                ofile.write_all(pad.as_slice()).unwrap();
+            }
         }
     } else {
-        for (uline, vline) in u.chunks(stride1).rev().zip(v.chunks(stride2).rev()) {
-            ofile.write_all(&uline[..w2]).unwrap();
-            ofile.write_all(pad.as_slice()).unwrap();
-
-            ofile.write_all(&vline[..w2]).unwrap();
-            ofile.write_all(pad.as_slice()).unwrap();
+        if !is_flipped {
+            for uline in u.chunks(stride1) {
+                ofile.write_all(&uline[..w2]).unwrap();
+                ofile.write_all(pad.as_slice()).unwrap();
+            }
+            for vline in v.chunks(stride2) {
+                ofile.write_all(&vline[..w2]).unwrap();
+                ofile.write_all(pad.as_slice()).unwrap();
+            }
+        } else {
+            for uline in u.chunks(stride1).rev() {
+                ofile.write_all(&uline[..w2]).unwrap();
+                ofile.write_all(pad.as_slice()).unwrap();
+            }
+            for vline in v.chunks(stride2).rev() {
+                ofile.write_all(&vline[..w2]).unwrap();
+                ofile.write_all(pad.as_slice()).unwrap();
+            }
         }
     }
     if has_alpha {
-- 
2.39.5