680    png_debug(1, "in png_write_IHDR");  in png_write_IHDR()
850    png_debug(1, "in png_write_PLTE");  in png_write_PLTE()
1076    png_debug(1, "in png_write_IEND");  in png_write_IEND()
1089    png_debug(1, "in png_write_gAMA");  in png_write_gAMA_fixed()
1104    png_debug(1, "in png_write_sRGB");  in png_write_sRGB()
1127    png_debug(1, "in png_write_iCCP");  in png_write_iCCP()
1192    png_debug(1, "in png_write_sPLT");  in png_write_sPLT()
1270    png_debug(1, "in png_write_sBIT");  in png_write_sBIT()
1328    png_debug(1, "in png_write_cHRM");  in png_write_cHRM_fixed()
1355    png_debug(1, "in png_write_tRNS");  in png_write_tRNS()
1420    png_debug(1, "in png_write_bKGD");  in png_write_bKGD()
1484    png_debug(1, "in png_write_eXIf");  in png_write_eXIf()
1506    png_debug(1, "in png_write_hIST");  in png_write_hIST()
1538    png_debug(1, "in png_write_tEXt");  in png_write_tEXt()
1582    png_debug(1, "in png_write_zTXt");  in png_write_zTXt()
1634    png_debug(1, "in png_write_iTXt");  in png_write_iTXt()
1731    png_debug(1, "in png_write_oFFs");  in png_write_oFFs()
1817    png_debug(1, "in png_write_sCAL_s");  in png_write_sCAL_s()
1847    png_debug(1, "in png_write_pHYs");  in png_write_pHYs()
1869    png_debug(1, "in png_write_tIME");  in png_write_tIME()
1917    png_debug(1, "in png_write_start_row");  in png_write_start_row()
2025    png_debug(1, "in png_write_finish_row");  in png_write_finish_row()
2108    png_debug(1, "in png_do_write_interlace");  in png_do_write_interlace()
2565    png_debug(1, "in png_write_find_filter");  in png_write_find_filter()
2753    png_debug(1, "in png_write_filtered_row");  in png_write_filtered_row()