LIBPNGPF(3) Library Functions Manual LIBPNGPF(3)
NAME
libpng - Portable Network Graphics (PNG) Reference Library 1.2.35 (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);
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);
void 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 back-
ground_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);
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);
png_uint_32 png_read_chunk_header (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);
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, dou-
ble 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. 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
February 14, 2009 LIBPNGPF(3)