From e316b0d667b82653e164d7acecde2d86a8ede550 Mon Sep 17 00:00:00 2001
From: Jake Archibald <jaffathecake@gmail.com>
Date: Tue, 25 Aug 2020 13:39:01 +0100
Subject: [PATCH] Use identity coefficients for true lossless

---
 codecs/avif/enc/avif_enc.cpp  |  10 ++++++++++
 codecs/avif/enc/avif_enc.wasm | Bin 1658670 -> 1658759 bytes
 2 files changed, 10 insertions(+)

diff --git a/codecs/avif/enc/avif_enc.cpp b/codecs/avif/enc/avif_enc.cpp
index 1f47e4a2..d8d13b8b 100644
--- a/codecs/avif/enc/avif_enc.cpp
+++ b/codecs/avif/enc/avif_enc.cpp
@@ -50,6 +50,16 @@ val encode(std::string buffer, int width, int height, AvifOptions options) {
 
   avifImage* image = avifImageCreate(width, height, depth, format);
 
+  if (
+    options.maxQuantizer == AVIF_QUANTIZER_LOSSLESS &&
+    options.minQuantizer == AVIF_QUANTIZER_LOSSLESS &&
+    options.minQuantizerAlpha == AVIF_QUANTIZER_LOSSLESS &&
+    options.maxQuantizerAlpha == AVIF_QUANTIZER_LOSSLESS &&
+    format == AVIF_PIXEL_FORMAT_YUV444
+  ) {
+    image->matrixCoefficients = AVIF_MATRIX_COEFFICIENTS_IDENTITY;
+  }
+
   uint8_t* rgba = (uint8_t*)buffer.c_str();
 
   avifRGBImage srcRGB;
diff --git a/codecs/avif/enc/avif_enc.wasm b/codecs/avif/enc/avif_enc.wasm
index 2a60d70df2438233674c90984a13537add4c1330..48c0c2ac45d08580a0e9b6fb84dc07b0fe6a5f98 100644
GIT binary patch
delta 303
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a6-?m(YB+=$G;jpRZ~~_=-z}Q6`u-P8)iV+R

delta 213
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PfFX=v43jdKQ-A*lUN<k~