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LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

NAME

     libpng - Portable Network Graphics (PNG)  Reference  Library
     1.2.12 (private functions)

SYNOPSIS

     #include <png.h>

     void png_build_gamma_table (png_structp png_ptr);

     void png_build_grayscale_palette (int bit_depth,  png_colorp
     palette);

     void png_calculate_crc (png_structp png_ptr, png_bytep  ptr,
     png_size_t length);

     void png_check_chunk_name  (png_structp  png_ptr,  png_bytep
     chunk_name);

     png_size_t png_check_keyword (png_structp png_ptr, png_charp
     key, png_charpp new_key);

     void png_combine_row (png_structp  png_ptr,  png_bytep  row,
     int mask);

                   Last change: June 27, 2006                   1

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void png_correct_palette  (png_structp  png_ptr,  png_colorp
     palette, int num_palette);

     int png_crc_error (png_structp png_ptr);

     int png_crc_finish (png_structp png_ptr, png_uint_32 skip);

     void  png_crc_read  (png_structp  png_ptr,  png_bytep   buf,
     png_size_t length);

     png_voidp png_create_struct (int type);

     png_voidp  png_create_struct_2  (int  type,   png_malloc_ptr
     malloc_fn, png_voidp mem_ptr);

     png_charp  png_decompress_chunk  (png_structp  png_ptr,  int
     comp_type,   png_charp  chunkdata,  png_size_t  chunklength,
     png_size_t prefix_length, png_size_t *data_length);

     void png_destroy_struct (png_voidp struct_ptr);

                   Last change: June 27, 2006                   2

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void     png_destroy_struct_2     (png_voidp     struct_ptr,
     png_free_ptr free_fn, png_voidp mem_ptr);

     void png_do_background  (png_row_infop  row_info,  png_bytep
     row,  png_color_16p  trans_values, png_color_16p background,
     png_color_16p background_1, png_bytep gamma_table, png_bytep
     gamma_from_1,  png_bytep gamma_to_1, png_uint_16pp gamma_16,
     png_uint_16pp gamma_16_from_1, png_uint_16pp  gamma_16_to_1,
     int gamma_shift);

     void png_do_bgr (png_row_infop row_info, png_bytep row);

     void png_do_chop (png_row_infop row_info, png_bytep row);

     void png_do_dither (png_row_infop row_info,  png_bytep  row,
     png_bytep palette_lookup, png_bytep dither_lookup);

     void png_do_expand (png_row_infop row_info,  png_bytep  row,
     png_color_16p trans_value);

     void    png_do_expand_palette    (png_row_infop    row_info,
     png_bytep  row,  png_colorp  palette,  png_bytep  trans, int
     num_trans);

                   Last change: June 27, 2006                   3

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void png_do_gamma (png_row_infop  row_info,  png_bytep  row,
     png_bytep  gamma_table,  png_uint_16pp  gamma_16_table,  int
     gamma_shift);

     void png_do_gray_to_rgb (png_row_infop  row_info,  png_bytep
     row);

     void png_do_invert (png_row_infop row_info, png_bytep row);

     void png_do_pack  (png_row_infop  row_info,  png_bytep  row,
     png_uint_32 bit_depth);

     void  png_do_packswap  (png_row_infop  row_info,   png_bytep
     row);

     void png_do_read_filler (png_row_infop  row_info,  png_bytep
     row, png_uint_32 filler, png_uint_32 flags);

     void    png_do_read_interlace    (png_row_infop    row_info,
     png_bytep row, int pass, png_uint_32 transformations);

     void   png_do_read_invert_alpha   (png_row_infop   row_info,
     png_bytep row);

                   Last change: June 27, 2006                   4

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void   png_do_read_swap_alpha    (png_row_infop    row_info,
     png_bytep row);

     void png_do_read_transformations (png_structp png_ptr);

     int png_do_rgb_to_gray  (png_row_infop  row_info,  png_bytep
     row);

     void png_do_shift (png_row_infop  row_info,  png_bytep  row,
     png_color_8p bit_depth);

     void png_do_strip_filler (png_row_infop row_info,  png_bytep
     row, png_uint_32 flags);

     void png_do_swap (png_row_infop row_info, png_bytep row);

     void png_do_unpack (png_row_infop row_info, png_bytep row);

     void png_do_unshift (png_row_infop row_info, png_bytep  row,
     png_color_8p sig_bits);

                   Last change: June 27, 2006                   5

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void   png_do_write_interlace    (png_row_infop    row_info,
     png_bytep row, int pass);

     void  png_do_write_invert_alpha   (png_row_infop   row_info,
     png_bytep row);

     void   png_do_write_swap_alpha   (png_row_infop    row_info,
     png_bytep row);

     void png_do_write_transformations (png_structp png_ptr);

     void *png_far_to_near  (png_structp  png_ptr,png_voidp  ptr,
     int check);

     void png_flush (png_structp png_ptr);

     void   png_handle_bKGD   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_cHRM   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

                   Last change: June 27, 2006                   6

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void   png_handle_gAMA   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_hIST   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_IEND   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_IHDR   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_iCCP   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_iTXt   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_oFFs   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_pCAL   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

                   Last change: June 27, 2006                   7

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void   png_handle_pHYs   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_PLTE   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_sBIT   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_sCAL   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_sPLT   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_sRGB   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_tEXt   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_tIME   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

                   Last change: June 27, 2006                   8

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void   png_handle_tRNS   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void  png_handle_unknown  (png_structp  png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void   png_handle_zTXt   (png_structp   png_ptr,   png_infop
     info_ptr, png_uint_32 length);

     void  png_info_destroy   (png_structp   png_ptr,   png_infop
     info_ptr);

     void png_init_mmx_flags (png_structp png_ptr);

     void png_init_read_transformations (png_structp png_ptr);

     void png_process_IDAT_data (png_structp  png_ptr,  png_bytep
     buffer, png_size_t buffer_length);

     void png_process_some_data (png_structp  png_ptr,  png_infop
     info_ptr);

                   Last change: June 27, 2006                   9

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void png_push_check_crc (png_structp png_ptr);

     void png_push_crc_finish (png_structp png_ptr);

     void  png_push_crc_skip  (png_structp  png_ptr,  png_uint_32
     length);

     void png_push_fill_buffer  (png_structp  png_ptr,  png_bytep
     buffer, png_size_t length);

     void png_push_handle_tEXt  (png_structp  png_ptr,  png_infop
     info_ptr, png_uint_32 length);

     void png_push_handle_unknown (png_structp png_ptr, png_infop
     info_ptr, png_uint_32 length);

     void png_push_handle_zTXt  (png_structp  png_ptr,  png_infop
     info_ptr, png_uint_32 length);

     void  png_push_have_end  (png_structp   png_ptr,   png_infop
     info_ptr);

                   Last change: June 27, 2006                  10

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void  png_push_have_info  (png_structp  png_ptr,   png_infop
     info_ptr);

     void png_push_have_row (png_structp png_ptr, png_bytep row);

     void png_push_process_row (png_structp png_ptr);

     void  png_push_read_chunk  (png_structp  png_ptr,  png_infop
     info_ptr);

     void  png_push_read_end  (png_structp   png_ptr,   png_infop
     info_ptr);

     void png_push_read_IDAT (png_structp png_ptr);

     void  png_push_read_sig  (png_structp   png_ptr,   png_infop
     info_ptr);

     void  png_push_read_tEXt  (png_structp  png_ptr,   png_infop
     info_ptr);

                   Last change: June 27, 2006                  11

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void  png_push_read_zTXt  (png_structp  png_ptr,   png_infop
     info_ptr);

     void png_push_restore_buffer (png_structp png_ptr, png_bytep
     buffer, png_size_t buffer_length);

     void png_push_save_buffer (png_structp png_ptr);

     void png_read_data  (png_structp  png_ptr,  png_bytep  data,
     png_size_t length);

     void png_read_filter_row (png_structp png_ptr, png_row_infop
     row_info, png_bytep row, png_bytep prev_row, int filter);

     void png_read_finish_row (png_structp png_ptr);

     void png_read_push_finish_row (png_structp png_ptr);

     void png_read_start_row (png_structp png_ptr);

                   Last change: June 27, 2006                  12

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void png_read_transform_info (png_structp png_ptr, png_infop
     info_ptr);

     void png_reset_crc (png_structp png_ptr);

     int png_set_text_2 (png_structp png_ptr, png_infop info_ptr,
     png_textp text_ptr, int num_text);

     void png_write_cHRM (png_structp  png_ptr,  double  white_x,
     double  white_y, double red_x, double red_y, double green_x,
     double green_y, double blue_x, double blue_y);

     void png_write_cHRM_fixed (png_structp png_ptr,  png_uint_32
     white_x, png_uint_32 white_y, png_uint_32 red_x, png_uint_32
     red_y, png_uint_32 green_x, png_uint_32 green_y, png_uint_32
     blue_x, png_uint_32 blue_y);

     void png_write_data (png_structp  png_ptr,  png_bytep  data,
     png_size_t length);

     void png_write_filtered_row (png_structp png_ptr,  png_bytep
     filtered_row);

     void     png_write_find_filter     (png_structp     png_ptr,

                   Last change: June 27, 2006                  13

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     png_row_infop row_info);

     void png_write_finish_row (png_structp png_ptr);

     void    png_write_gAMA    (png_structp    png_ptr,    double
     file_gamma);

     void png_write_gAMA_fixed (png_structp png_ptr,  png_uint_32
     int_file_gamma);

     void png_write_hIST (png_structp png_ptr, png_uint_16p hist,
     int num_hist);

     void png_write_iCCP (png_structp  png_ptr,  png_charp  name,
     int compression_type, png_charp profile, int proflen);

     void png_write_IDAT (png_structp  png_ptr,  png_bytep  data,
     png_size_t length);

     void png_write_IEND (png_structp png_ptr);

                   Last change: June 27, 2006                  14

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void png_write_IHDR (png_structp png_ptr, png_uint_32 width,
     png_uint_32  height,  int  bit_depth,  int  color_type,  int
     compression_type, int filter_type, int interlace_type);

     void png_write_iTXt (png_structp png_ptr,  int  compression,
     png_charp  key,  png_charp  lang,  png_charp translated_key,
     png_charp text);

     void  png_write_oFFs   (png_structp   png_ptr,   png_uint_32
     x_offset, png_uint_32 y_offset, int unit_type);

     void png_write_pCAL (png_structp png_ptr, png_charp purpose,
     png_int_32   X0,  png_int_32  X1,  int  type,  int  nparams,
     png_charp units, png_charpp params);

     void  png_write_pHYs   (png_structp   png_ptr,   png_uint_32
     x_pixels_per_unit,    png_uint_32   y_pixels_per_unit,   int
     unit_type);

     void   png_write_PLTE   (png_structp   png_ptr,   png_colorp
     palette, png_uint_32 num_pal);

     void png_write_sBIT (png_structp png_ptr, png_color_8p sbit,
     int color_type);

                   Last change: June 27, 2006                  15

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void png_write_sCAL (png_structp  png_ptr,  png_charp  unit,
     double width, double height);

     void png_write_sCAL_s (png_structp png_ptr, png_charp  unit,
     png_charp width, png_charp height);

     void png_write_sig (png_structp png_ptr);

     void png_write_sRGB (png_structp png_ptr, int intent);

     void  png_write_sPLT  (png_structp  png_ptr,  png_spalette_p
     palette);

     void png_write_start_row (png_structp png_ptr);

     void png_write_tEXt  (png_structp  png_ptr,  png_charp  key,
     png_charp text, png_size_t text_len);

     void   png_write_tIME   (png_structp   png_ptr,    png_timep
     mod_time);

                   Last change: June 27, 2006                  16

LIBPNGPF(3)            C LIBRARY FUNCTIONS            LIBPNGPF(3)

     void png_write_tRNS (png_structp png_ptr,  png_bytep  trans,
     png_color_16p values, int number, int color_type);

     void png_write_zTXt  (png_structp  png_ptr,  png_charp  key,
     png_charp text, png_size_t text_len, int compression);

     voidpf png_zalloc (voidpf png_ptr, uInt items, uInt size);

     void png_zfree (voidpf png_ptr, voidpf ptr);

DESCRIPTION

     The functions listed above are used privately by libpng  and
     are  not  recommended for use by applications.  They are not
     "exported" to applications using shared libraries.  They are
     listed  alphabetically here as an aid to libpng maintainers.
     See png.h for more information on these functions.

SEE ALSO

     libpng(3), png(5)

AUTHOR

     Glenn Randers-Pehrson

                   Last change: June 27, 2006                  17
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