libpng: Optimize RGBA png_do_expand_palette

third_party/libpng/pngpriv.h

Index: third_party/libpng/pngpriv.h
diff --git a/third_party/libpng/pngpriv.h b/third_party/libpng/pngpriv.h
index 9ea023fea7bea2c449e6b22e4108095aa390c4ef..4a4a49b9794f0da2cd1d8bfa7aeafe3416cc9853 100644
--- a/third_party/libpng/pngpriv.h
+++ b/third_party/libpng/pngpriv.h
@@ -1971,6 +1971,14 @@ PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,
 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
    png_const_charp key, png_bytep new_key), PNG_EMPTY);
 
+#if PNG_ARM_NEON_IMPLEMENTATION == 1
+PNG_INTERNAL_FUNCTION(void, png_riffle_palette,
+   (png_structrp, png_row_infop), PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(int, png_do_expand_palette_neon,
+   (png_structrp, png_row_infop, png_const_bytep, const png_bytepp,
+   const png_bytepp), PNG_EMPTY);
+#endif
+
 /* Maintainer: Put new private prototypes here ^ */
 
 #include "pngdebug.h"