PNG: don’t write cLLi chunk if the maximum luminance is 10 000 (libjx…

…l#3949)
libsdl-org · Nov 25, 2024 · 5ea4ea1 · 5ea4ea1
1 parent 706f78a
commit 5ea4ea1
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/lib/extras/enc/apng.cc b/lib/extras/enc/apng.cc
@@ -264,9 +264,10 @@ void MaybeAddGAMA(const JxlColorEncoding& c_enc, png_structp png_ptr,
 void MaybeAddCLLi(const JxlColorEncoding& c_enc, const float intensity_target,
                   png_structp png_ptr, png_infop info_ptr) {
   if (c_enc.transfer_function != JXL_TRANSFER_FUNCTION_PQ) return;
+  if (intensity_target == 10'000) return;
 
   const uint32_t max_content_light_level =
-      static_cast<uint32_t>(10000.f * Clamp1(intensity_target, 0.f, 10000.f));
+      static_cast<uint32_t>(10'000.f * Clamp1(intensity_target, 0.f, 10'000.f));
   png_byte chunk_data[8] = {};
   png_save_uint_32(chunk_data, max_content_light_level);
   // Leave MaxFALL set to 0.