libpngpf

LIBPNGPF(3)                                                        LIBPNGPF(3)



NAME
       libpng  - Portable Network Graphics (PNG) Reference Library 1.2.2 (pri-
       vate 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);



       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);



       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);



       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);



       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);



       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);



       png_int_32 png_get_int_32 (png_bytep buf);



       png_uint_16 png_get_uint_16 (png_bytep buf);



       png_uint_32 png_get_uint_32 (png_bytep buf);



       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);



       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);



       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);



       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);



       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);



       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);



       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);



       void png_read_transform_info (png_structp png_ptr, png_infop info_ptr);



       void png_reset_crc (png_structp png_ptr);



       void png_save_int_32 (png_bytep buf, png_int_32 i);



       void png_save_uint_16 (png_bytep buf, unsigned int i);



       void png_save_uint_32 (png_bytep buf, png_uint_32 i);



       void png_write_bKGD (png_structp  png_ptr,  png_color_16p  values,  int
       color_type);



       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   fil-
       tered_row);



       void    png_write_find_filter   (png_structp   png_ptr,   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  compres-
       sion_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);



       void   png_write_IHDR   (png_structp   png_ptr,   png_uint_32    width,
       png_uint_32   height,  int  bit_depth,  int  color_type,  int  compres-
       sion_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_pix-
       els_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);



       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);



       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);




DESCRIPTION
       The functions listed above are used privately by  libpng  and  are  not
       recommended for use by applications.  They are not "exported" to appli-
       cations 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



                                April 15, 2002                     LIBPNGPF(3)