From 8c9a7e88e5d359d4bdc27d77d33c31a40f372e51 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Novomesk=C3=BD?= <dnovomesky@gmail.com>
Date: Wed, 24 Dec 2025 14:43:46 +0100
Subject: [PATCH] avif: YCgCo-Re decoding fix

---
 src/imageformats/avif.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/imageformats/avif.cpp b/src/imageformats/avif.cpp
index fdfaef8..3b29349 100644
--- a/src/imageformats/avif.cpp
+++ b/src/imageformats/avif.cpp
@@ -265,9 +265,15 @@ bool QAVIFHandler::decode_one_frame()
         }
     }
 
+    uint32_t resultdepth = m_decoder->image->depth;
+    if (m_decoder->image->matrixCoefficients == 16 && m_decoder->image->yuvFormat == AVIF_PIXEL_FORMAT_YUV444 && resultdepth == 10) {
+        // 10-bit YCgCo-Re AVIF must be decoded to 8bit
+        resultdepth = 8;
+    }
+
     QImage::Format resultformat;
 
-    if (m_decoder->image->depth > 8) {
+    if (resultdepth > 8) {
         if (loadalpha) {
             resultformat = QImage::Format_RGBA64;
         } else {
@@ -405,7 +411,7 @@ bool QAVIFHandler::decode_one_frame()
     rgb.maxThreads = m_decoder->maxThreads;
 #endif
 
-    if (m_decoder->image->depth > 8) {
+    if (resultdepth > 8) {
         rgb.depth = 16;
         rgb.format = AVIF_RGB_FORMAT_RGBA;