From cc7053c793b5dba1048842e5ab520e02b030c385 Mon Sep 17 00:00:00 2001
From: Jason Simmons <jason-simmons@users.noreply.github.com>
Date: Tue, 14 Feb 2023 10:20:15 -0800
Subject: [PATCH] Remove libpng dependency in the APNG decoder
 (flutter/engine#39622)

---
 engine/src/flutter/lib/ui/painting/image_generator_apng.cc | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/engine/src/flutter/lib/ui/painting/image_generator_apng.cc b/engine/src/flutter/lib/ui/painting/image_generator_apng.cc
index 943d7752015..45c197b71fd 100644
--- a/engine/src/flutter/lib/ui/painting/image_generator_apng.cc
+++ b/engine/src/flutter/lib/ui/painting/image_generator_apng.cc
@@ -7,7 +7,6 @@
 #include <cstring>
 
 #include "flutter/fml/logging.h"
-#include "third_party/libpng/png.h"
 #include "third_party/skia/include/codec/SkCodecAnimation.h"
 #include "third_party/skia/include/core/SkAlphaType.h"
 #include "third_party/skia/include/core/SkColorType.h"
@@ -202,8 +201,7 @@ std::unique_ptr<ImageGenerator> APNGImageGenerator::MakeFromData(
   }
   // Validate the full PNG signature.
   const uint8_t* data_p = static_cast<const uint8_t*>(data.get()->data());
-  if (png_sig_cmp(static_cast<png_const_bytep>(data_p), 0,
-                  sizeof(kPngSignature))) {
+  if (memcmp(data_p, kPngSignature, sizeof(kPngSignature))) {
     return nullptr;
   }