PNG_CMAP_TRANS   2282 pngread.c                     output_processing = PNG_CMAP_TRANS;
PNG_CMAP_TRANS   2851 pngread.c            case PNG_CMAP_TRANS:
PNG_CMAP_TRANS   2984 pngread.c                     case PNG_CMAP_TRANS:
PNG_CMAP_TRANS   3106 pngread.c            case PNG_CMAP_TRANS: