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libpngpf(3)			       C Library Functions			      libpngpf(3)

NAME
       libpng - Portable Network Graphics (PNG) Reference Library 1.0.12 (private functions)

SYNOPSIS
       #include <png.h>

       cc [ flag ...] -I/usr/sfw/include file [  library  ...  ]  -
       L/usr/sfw/lib -R/usr/sfw/lib -lpng

       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_malloc_ptr
       malloc_fn);

       png_voidp png_create_struct_2 (int type);

       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);

       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);

       int png_handle_as_unknown  (png_structp	png_ptr,  png_bytep
       chunk_name);

       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 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);

       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);

       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. The functions are listed alphabetically here as an aid to	libpng	maintain-
       ers.  See png.h for more information about these functions.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWpng			   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Uncommitted		   |
       +-----------------------------+-----------------------------+

SEE ALSO
       libpng(3), png(4), attributes(5)

NOTES
       This  man page was originally written by Glenn Randers-Pehrson. Updated by Breda McColgan,
       Sun Microsystems Inc., 2004.

SunOS 5.11				   26 Mar 2004				      libpngpf(3)
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