handle flipped image output correctly

1 files changed, 80 insertions, 38 deletions

diff --git a/src/frmwriter.rs b/src/frmwriter.rs
index 57141cd..53acdb9 100644
--- a/src/frmwriter.rs
+++ b/src/frmwriter.rs
@@ -9,6 +9,7 @@ pub fn write_pgmyuv(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
     let name = format!("{}out{:02}_{:08}.pgm", pfx, strno, num);
     let mut ofile = File::create(name).unwrap();
     let buf = frm.get_buffer().get_vbuf().unwrap();
+    let is_flipped = buf.get_info().is_flipped();
     let (w, h) = buf.get_dimensions(0);
     let (w2, h2) = buf.get_dimensions(1);
     let has_alpha = buf.get_info().get_format().has_alpha();
@@ -22,32 +23,40 @@ pub fn write_pgmyuv(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
     ofile.write_all(hdr.as_bytes()).unwrap();
     let dta = buf.get_data();
     let ls = buf.get_stride(0);
-    let mut idx = 0;
-    let mut idx2 = w;
     let pad: Vec<u8> = vec![0xFF; (w - w2 * 2) / 2];
-    for _ in 0..h {
-        let line = &dta[idx..idx2];
-        ofile.write_all(line).unwrap();
-        idx  += ls;
-        idx2 += ls;
+    if !is_flipped {
+        let ylines = dta.chunks(ls).take(h);
+        for line in ylines {
+            ofile.write_all(&line[..w]).unwrap();
+        }
+    } else {
+        let ylines = dta[..h * ls].chunks(ls).rev();
+        for line in ylines {
+            ofile.write_all(&line[..w]).unwrap();
+        }
     }
-    let mut base1 = buf.get_offset(1);
+    let base1 = buf.get_offset(1);
     let stride1 = buf.get_stride(1);
-    let mut base2 = buf.get_offset(2);
+    let base2 = buf.get_offset(2);
     let stride2 = buf.get_stride(2);
-    for _ in 0..h2 {
-        let bend1 = base1 + w2;
-        let line = &dta[base1..bend1];
-        ofile.write_all(line).unwrap();
-        ofile.write_all(pad.as_slice()).unwrap();
+    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();
 
-        let bend2 = base2 + w2;
-        let line = &dta[base2..bend2];
-        ofile.write_all(line).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();
 
-        base1 += stride1;
-        base2 += stride2;
+            ofile.write_all(&vline[..w2]).unwrap();
+            ofile.write_all(pad.as_slice()).unwrap();
+        }
     }
     if has_alpha {
         let ls = buf.get_stride(3);
@@ -77,7 +86,8 @@ pub fn write_palppm(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
             buf.get_info().get_format().get_chromaton(1).unwrap().get_offset() as usize,
             buf.get_info().get_format().get_chromaton(2).unwrap().get_offset() as usize
         ];
-    let mut idx  = 0;
+    let flipped = buf.get_info().is_flipped();
+    let mut idx  = if !flipped { 0 } else { ls * (h - 1) };
     let mut line: Vec<u8> = vec![0; w * 3];
     for _ in 0..h {
         let src = &dta[idx..(idx+w)];
@@ -88,7 +98,11 @@ pub fn write_palppm(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
             line[x * 3 + 2] = dta[paloff + pix * 3 + offs[2]];
         }
         ofile.write_all(line.as_slice()).unwrap();
-        idx  += ls;
+        if !flipped {
+            idx += ls;
+        } else {
+            idx -= ls;
+        }
     }
 }
 
@@ -106,15 +120,27 @@ pub fn write_ppm(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
                 buf.get_info().get_format().get_chromaton(1).unwrap().get_offset() as usize,
                 buf.get_info().get_format().get_chromaton(2).unwrap().get_offset() as usize
             ];
+        let flipped = buf.get_info().is_flipped();
         let step = buf.get_info().get_format().get_elem_size() as usize;
         let mut line: Vec<u8> = vec![0; w * 3];
-        for src in dta.chunks(stride) {
-            for x in 0..w {
-                line[x * 3 + 0] = src[x * step + offs[0]];
-                line[x * 3 + 1] = src[x * step + offs[1]];
-                line[x * 3 + 2] = src[x * step + offs[2]];
+        if !flipped {
+            for src in dta.chunks(stride) {
+                for x in 0..w {
+                    line[x * 3 + 0] = src[x * step + offs[0]];
+                    line[x * 3 + 1] = src[x * step + offs[1]];
+                    line[x * 3 + 2] = src[x * step + offs[2]];
+                }
+                ofile.write_all(line.as_slice()).unwrap();
+            }
+        } else {
+            for src in dta[..stride * h].chunks(stride).rev() {
+                for x in 0..w {
+                    line[x * 3 + 0] = src[x * step + offs[0]];
+                    line[x * 3 + 1] = src[x * step + offs[1]];
+                    line[x * 3 + 2] = src[x * step + offs[2]];
+                }
+                ofile.write_all(line.as_slice()).unwrap();
             }
-            ofile.write_all(line.as_slice()).unwrap();
         }
     } else if let NABufferType::Video16(ref buf) = frm.get_buffer() {
         let (w, h) = buf.get_dimensions(0);
@@ -138,17 +164,33 @@ pub fn write_ppm(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
                 buf.get_info().get_format().get_chromaton(2).unwrap().get_shift()
             ];
         let mut line: Vec<u8> = vec![0; w * 3];
-        for src in dta.chunks(stride) {
-            for x in 0..w {
-                let elem = src[x];
-                let r = ((elem >> shifts[0]) & masks[0]) << (8 - depths[0]);
-                let g = ((elem >> shifts[1]) & masks[1]) << (8 - depths[1]);
-                let b = ((elem >> shifts[2]) & masks[2]) << (8 - depths[2]);
-                line[x * 3 + 0] = r as u8;
-                line[x * 3 + 1] = g as u8;
-                line[x * 3 + 2] = b as u8;
+        let flipped = buf.get_info().is_flipped();
+        if !flipped {
+            for src in dta.chunks(stride) {
+                for x in 0..w {
+                    let elem = src[x];
+                    let r = ((elem >> shifts[0]) & masks[0]) << (8 - depths[0]);
+                    let g = ((elem >> shifts[1]) & masks[1]) << (8 - depths[1]);
+                    let b = ((elem >> shifts[2]) & masks[2]) << (8 - depths[2]);
+                    line[x * 3 + 0] = r as u8;
+                    line[x * 3 + 1] = g as u8;
+                    line[x * 3 + 2] = b as u8;
+                }
+                ofile.write_all(line.as_slice()).unwrap();
+            }
+        } else {
+            for src in dta[..h * stride].chunks(stride).rev() {
+                for x in 0..w {
+                    let elem = src[x];
+                    let r = ((elem >> shifts[0]) & masks[0]) << (8 - depths[0]);
+                    let g = ((elem >> shifts[1]) & masks[1]) << (8 - depths[1]);
+                    let b = ((elem >> shifts[2]) & masks[2]) << (8 - depths[2]);
+                    line[x * 3 + 0] = r as u8;
+                    line[x * 3 + 1] = g as u8;
+                    line[x * 3 + 2] = b as u8;
+                }
+                ofile.write_all(line.as_slice()).unwrap();
             }
-            ofile.write_all(line.as_slice()).unwrap();
         }
     } else {
 panic!(" unhandled buf format");