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LIBPNGPF(3)					      LIBPNGPF(3)

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

SYNOPSIS
       #include <png.h>

       void png_build_gamma_table (png_structp png_ptr);

       void png_build_grayscale_palette (int bit_depth,	 png_col-
       orp 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_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 filtered_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 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);

       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   inter-
       lace_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  pur-
       pose, 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);

       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  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

			 October 3, 2002	      LIBPNGPF(3)
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