403    png_debug(1, "in png_write_IHDR");  in png_write_IHDR()
582    png_debug(1, "in png_write_PLTE");  in png_write_PLTE()
646    png_debug(1, "in png_write_IDAT");  in png_write_IDAT()
701    png_debug(1, "in png_write_IEND");  in png_write_IEND()
720    png_debug(1, "in png_write_gAMA");  in png_write_gAMA()
737    png_debug(1, "in png_write_gAMA");  in png_write_gAMA_fixed()
756    png_debug(1, "in png_write_sRGB");  in png_write_sRGB()
780    png_debug(1, "in png_write_iCCP");  in png_write_iCCP()
865    png_debug(1, "in png_write_sPLT");  in png_write_sPLT()
939    png_debug(1, "in png_write_sBIT");  in png_write_sBIT()
1001    png_debug(1, "in png_write_cHRM");  in png_write_cHRM()
1047    png_debug(1, "in png_write_cHRM");  in png_write_cHRM_fixed()
1084    png_debug(1, "in png_write_tRNS");  in png_write_tRNS()
1140    png_debug(1, "in png_write_bKGD");  in png_write_bKGD()
1195    png_debug(1, "in png_write_hIST");  in png_write_hIST()
1236    png_debug(1, "in png_check_keyword");  in png_check_keyword()
1360    png_debug(1, "in png_write_tEXt");  in png_write_tEXt()
1403    png_debug(1, "in png_write_zTXt");  in png_write_zTXt()
1464    png_debug(1, "in png_write_iTXt");  in png_write_iTXt()
1549    png_debug(1, "in png_write_oFFs");  in png_write_oFFs()
1636    png_debug(1, "in png_write_sCAL");  in png_write_sCAL()
1677    png_debug(1, "in png_write_sCAL_s");  in png_write_sCAL_s()
1711    png_debug(1, "in png_write_pHYs");  in png_write_pHYs()
1736    png_debug(1, "in png_write_tIME");  in png_write_tIME()
1779    png_debug(1, "in png_write_start_row");  in png_write_start_row()
1877    png_debug(1, "in png_write_finish_row");  in png_write_finish_row()
1985    png_debug(1, "in png_do_write_interlace");  in png_do_write_interlace()
2157    png_debug(1, "in png_write_find_filter");  in png_write_find_filter()
2775    png_debug(1, "in png_write_filtered_row");  in png_write_filtered_row()