From f23e663a21829356e966f6f815dd3372462084a1 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Sun, 20 Oct 2019 16:14:36 +0200
Subject: zimg: support 3 component 16 bit pixel unpacking

Works for RGB (e.g. rgb48le) and XYZ.

It's unsure whether XYZ is really correctly converted.
---
 video/zimg.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'video')

diff --git a/video/zimg.c b/video/zimg.c
index c5b0d07b62..d9fde65f19 100644
--- a/video/zimg.c
+++ b/video/zimg.c
@@ -253,6 +253,17 @@ static void xccc8_pack(void *dst, void *src[], int x0, int x1)
     }
 }
 
+// 3 16 bit color components written to 3 planes.
+static void ccc16_unpack(void *src, void *dst[], int x0, int x1)
+{
+    uint16_t *r = src;
+    for (int x = x0; x < x1; x++) {
+        ((uint16_t *)dst[0])[x] = *r++;
+        ((uint16_t *)dst[1])[x] = *r++;
+        ((uint16_t *)dst[2])[x] = *r++;
+    }
+}
+
 static int packed_repack(void *user, unsigned i, unsigned x0, unsigned x1)
 {
     struct mp_zimg_repack *r = user;
@@ -357,6 +368,17 @@ static void setup_regular_rgb_packer(struct mp_zimg_repack *r)
             r->components[n] = corder[p->components[first + n]];
         return;
     }
+
+    if (desc.component_size == 2 && p->num_components == 3) {
+        if (r->pack) // no packer yet
+            return;
+        r->repack = packed_repack;
+        r->packed_repack_scanline = ccc16_unpack;
+        r->zimgfmt = planar_fmt;
+        for (int n = 0; n < 3; n++)
+            r->components[n] = corder[p->components[n]];
+        return;
+    }
 }
 
 // (ctx can be NULL for the sake of probing.)
-- 
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