png_read_start_row 1235 pngpriv.h      PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
png_read_start_row  267 pngread.c               png_read_start_row(png_ptr);
png_read_start_row  297 pngread.c               png_read_start_row(png_ptr);
png_read_start_row  389 pngread.c            png_read_start_row(png_ptr);