[libpng16] Recognize known sRGB ICC profiles while reading; prefer writing the
iCCP profile over writing the sRGB chunk, controlled by the
PNG_sRGB_PROFILE_CHECKS option.
diff --git a/pngpriv.h b/pngpriv.h
index 7a61a2d..71cb28f 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -1443,9 +1443,14 @@
png_colorspacerp colorspace, png_const_charp name,
png_uint_32 profile_length,
png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_icc_set_gAMA_and_cHRM,(
+PNG_INTERNAL_FUNCTION(int,png_icc_set_gAMA_and_cHRM,(
png_const_structrp png_ptr, png_colorspacerp colorspace,
- png_const_charp name, png_const_bytep profile, int preferred), PNG_EMPTY);
+ png_const_charp name, png_const_bytep profile, uLong adler, int preferred),
+ PNG_EMPTY);
+ /* 'adler' is the Adler32 checksum of the uncompressed profile data, it may
+ * be 0 to indicate that it is not available. It is used, if provided, as a
+ * fast check on the profile when checking to see if it is sRGB.
+ */
#endif /* iCCP */
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
