unit pngdef;
// Caution: this file has fallen out of date since version 1.0.5. Write to
// png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu about volunteering
// to it up to date.
interface
const
PNG_LIBPNG_VER_STRING = '1.2.5';
PNG_LIBPNG_VER = 10205;
type
png_uint_32 = Cardinal;
png_int_32 = Longint;
png_uint_16 = Word;
png_int_16 = Smallint;
png_byte = Byte;
png_size_t = png_uint_32;
png_charpp = ^png_charp;
png_charp = PChar;
float = single;
int = Integer;
png_bytepp = ^png_bytep;
png_bytep = ^png_byte;
png_uint_16p = ^png_uint_16;
png_uint_16pp = ^png_uint_16p;
png_voidp = pointer;
time_t = Longint;
png_doublep = ^png_double;
png_double = double;
user_error_ptr = Pointer;
png_error_ptrp = ^png_error_ptr;
png_error_ptr = procedure(png_ptr: Pointer; msg: Pointer);
stdcall;
png_rw_ptrp = ^png_rw_ptr;
png_rw_ptr = procedure(png_ptr: Pointer; data: Pointer;
length: png_size_t);
stdcall;
png_flush_ptrp = ^png_flush_ptr;
png_flush_ptr = procedure(png_ptr: Pointer);
stdcall;
png_progressive_info_ptrp = ^png_progressive_info_ptr;
png_progressive_info_ptr = procedure(png_ptr: Pointer;
info_ptr: Pointer);
stdcall;
png_progressive_end_ptrp = ^png_progressive_end_ptr;
png_progressive_end_ptr = procedure(png_ptr: Pointer;
info_ptr: Pointer);
stdcall;
png_progressive_row_ptrp = ^png_progressive_row_ptr;
png_progressive_row_ptr = procedure(png_ptr: Pointer;
data: Pointer; length: png_uint_32;
count: int);
stdcall;
png_read_status_ptr = procedure(png_ptr: Pointer;
row_number: png_uint_32; pass: int);
stdcall;
png_write_status_ptr = procedure(png_ptr: Pointer;
row_number: png_uint_32; pass: int);
stdcall;
png_user_chunk_ptr = procedure(png_ptr: Pointer;
data: png_unknown_chunkp);
stdcall;
png_user_transform_ptr = procedure(png_ptr: Pointer;
row_info: Pointer; data: png_bytep);
stdcall;
png_colorpp = ^png_colorp;
png_colorp = ^png_color;
png_color = packed record
red, green, blue: png_byte;
end;
png_color_16pp = ^png_color_16p;
png_color_16p = ^png_color_16;
png_color_16 = packed record
index: png_byte; //used for palette files
red, green, blue: png_uint_16; //for use in red green blue files
gray: png_uint_16; //for use in grayscale files
end;
png_color_8pp = ^png_color_8p;
png_color_8p = ^png_color_8;
png_color_8 = packed record
red, green, blue: png_byte; //for use in red green blue files
gray: png_byte; //for use in grayscale files
alpha: png_byte; //for alpha channel files
end;
png_textpp = ^png_textp;
png_textp = ^png_text;
png_text = packed record
compression: int; //compression value
key: png_charp; //keyword, 1-79 character description of "text"
text: png_charp; //comment, may be empty ("")
text_length: png_size_t; //length of text field
end;
png_timepp = ^png_timep;
png_timep = ^png_time;
png_time = packed record
year: png_uint_16; //yyyy
month: png_byte; //1..12
day: png_byte; //1..31
hour: png_byte; //0..23
minute: png_byte; //0..59
second: png_byte; //0..60 (leap seconds)
end;
png_infopp = ^png_infop;
png_infop = Pointer;
png_row_infopp = ^png_row_infop;
png_row_infop = ^png_row_info;
png_row_info = packed record
width: png_uint_32; //width of row
rowbytes: png_size_t; //number of bytes in row
color_type: png_byte; //color type of row
bit_depth: png_byte; //bit depth of row
channels: png_byte; //number of channels (1, 2, 3, or 4)
pixel_depth: png_byte; //bits per pixel (depth * channels)
end;
png_structpp = ^png_structp;
png_structp = Pointer;
const
// Supported compression types for text in PNG files (tEXt, and zTXt).
// The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed.
PNG_TEXT_COMPRESSION_NONE_WR = -3;
PNG_TEXT_COMPRESSION_zTXt_WR = -2;
PNG_TEXT_COMPRESSION_NONE = -1;
PNG_TEXT_COMPRESSION_zTXt = 0;
// These describe the color_type field in png_info.
// color type masks
PNG_COLOR_MASK_PALETTE = 1;
PNG_COLOR_MASK_COLOR = 2;
PNG_COLOR_MASK_ALPHA = 4;
// color types. Note that not all combinations are legal
PNG_COLOR_TYPE_GRAY = 0;
PNG_COLOR_TYPE_PALETTE = PNG_COLOR_MASK_COLOR or
PNG_COLOR_MASK_PALETTE;
PNG_COLOR_TYPE_RGB = PNG_COLOR_MASK_COLOR;
PNG_COLOR_TYPE_RGB_ALPHA = PNG_COLOR_MASK_COLOR or
PNG_COLOR_MASK_ALPHA;
PNG_COLOR_TYPE_GRAY_ALPHA = PNG_COLOR_MASK_ALPHA;
// This is for compression type. PNG 1.0 only defines the single type.
PNG_COMPRESSION_TYPE_BASE = 0; // Deflate method 8, 32K window
PNG_COMPRESSION_TYPE_DEFAULT = PNG_COMPRESSION_TYPE_BASE;
// This is for filter type. PNG 1.0 only defines the single type.
PNG_FILTER_TYPE_BASE = 0; // Single row per-byte filtering
PNG_FILTER_TYPE_DEFAULT = PNG_FILTER_TYPE_BASE;
// These are for the interlacing type. These values should NOT be changed.
PNG_INTERLACE_NONE = 0; // Non-interlaced image
PNG_INTERLACE_ADAM7 = 1; // Adam7 interlacing
// These are for the oFFs chunk. These values should NOT be changed.
PNG_OFFSET_PIXEL = 0; // Offset in pixels
PNG_OFFSET_MICROMETER = 1; // Offset in micrometers (1/10^6 meter)
// These are for the pCAL chunk. These values should NOT be changed.
PNG_EQUATION_LINEAR = 0; // Linear transformation
PNG_EQUATION_BASE_E = 1; // Exponential base e transform
PNG_EQUATION_ARBITRARY = 2; // Arbitrary base exponential transform
PNG_EQUATION_HYPERBOLIC = 3; // Hyperbolic sine transformation
// These are for the pHYs chunk. These values should NOT be changed.
PNG_RESOLUTION_UNKNOWN = 0; // pixels/unknown unit (aspect ratio)
PNG_RESOLUTION_METER = 1; // pixels/meter
// These are for the sRGB chunk. These values should NOT be changed.
PNG_sRGB_INTENT_PERCEPTUAL = 0;
PNG_sRGB_INTENT_RELATIVE = 1;
PNG_sRGB_INTENT_SATURATION = 2;
PNG_sRGB_INTENT_ABSOLUTE = 3;
// Handle alpha and tRNS by replacing with a background color.
PNG_BACKGROUND_GAMMA_UNKNOWN = 0;
PNG_BACKGROUND_GAMMA_SCREEN = 1;
PNG_BACKGROUND_GAMMA_FILE = 2;
PNG_BACKGROUND_GAMMA_UNIQUE = 3;
// Values for png_set_crc_action() to say how to handle CRC errors in
// ancillary and critical chunks, and whether to use the data contained
// therein. Note that it is impossible to "discard" data in a critical
// chunk. For versions prior to 0.90, the action was always error/quit,
// whereas in version 0.90 and later, the action for CRC errors in ancillary
// chunks is warn/discard. These values should NOT be changed.
// value action:critical action:ancillary
PNG_CRC_DEFAULT = 0; // error/quit warn/discard data
PNG_CRC_ERROR_QUIT = 1; // error/quit error/quit
PNG_CRC_WARN_DISCARD = 2; // (INVALID) warn/discard data
PNG_CRC_WARN_USE = 3; // warn/use data warn/use data
PNG_CRC_QUIET_USE = 4; // quiet/use data quiet/use data
PNG_CRC_NO_CHANGE = 5; // use current value use current value
// Flags for png_set_filter() to say which filters to use. The flags
// are chosen so that they don't conflict with real filter types
// below, in case they are supplied instead of the #defined constants.
// These values should NOT be changed.
PNG_NO_FILTERS = $00;
PNG_FILTER_NONE = $08;
PNG_FILTER_SUB = $10;
PNG_FILTER_UP = $20;
PNG_FILTER_AVG = $40;
PNG_FILTER_PAETH = $80;
PNG_ALL_FILTERS = PNG_FILTER_NONE or PNG_FILTER_SUB or
PNG_FILTER_UP or PNG_FILTER_AVG or
PNG_FILTER_PAETH;
// Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
// These defines should NOT be changed.
PNG_FILTER_VALUE_NONE = 0;
PNG_FILTER_VALUE_SUB = 1;
PNG_FILTER_VALUE_UP = 2;
PNG_FILTER_VALUE_AVG = 3;
PNG_FILTER_VALUE_PAETH = 4;
// Heuristic used for row filter selection. These defines should NOT be
// changed.
PNG_FILTER_HEURISTIC_DEFAULT = 0; // Currently "UNWEIGHTED"
PNG_FILTER_HEURISTIC_UNWEIGHTED = 1; // Used by libpng < 0.95
PNG_FILTER_HEURISTIC_WEIGHTED = 2; // Experimental feature
PNG_FILTER_HEURISTIC_LAST = 3; // Not a valid value
procedure png_build_grayscale_palette(bit_depth: int; palette: png_colorp);
stdcall;
function png_check_sig(sig: png_bytep; num: int): int;
stdcall;
procedure png_chunk_error(png_ptr: png_structp;
const mess: png_charp);
stdcall;
procedure png_chunk_warning(png_ptr: png_structp;
const mess: png_charp);
stdcall;
procedure png_convert_from_time_t(ptime: png_timep; ttime: time_t);
stdcall;
function png_convert_to_rfc1123(png_ptr: png_structp; ptime: png_timep):
png_charp;
stdcall;
function png_create_info_struct(png_ptr: png_structp): png_infop;
stdcall;
function png_create_read_struct(user_png_ver: png_charp;
error_ptr: user_error_ptr; error_fn: png_error_ptr;
warn_fn: png_error_ptr): png_structp;
stdcall;
function png_get_copyright(png_ptr: png_structp): png_charp;
stdcall;
function png_get_header_ver(png_ptr: png_structp): png_charp;
stdcall;
function png_get_header_version(png_ptr: png_structp): png_charp;
stdcall;
function png_get_libpng_ver(png_ptr: png_structp): png_charp;
stdcall;
function png_create_write_struct(user_png_ver: png_charp;
error_ptr: user_error_ptr; error_fn: png_error_ptr;
warn_fn: png_error_ptr): png_structp;
stdcall;
procedure png_destroy_info_struct(png_ptr: png_structp;
info_ptr_ptr: png_infopp);
stdcall;
procedure png_destroy_read_struct(png_ptr_ptr: png_structpp;
info_ptr_ptr, end_info_ptr_ptr: png_infopp);
stdcall;
procedure png_destroy_write_struct(png_ptr_ptr: png_structpp;
info_ptr_ptr: png_infopp);
stdcall;
function png_get_IHDR(png_ptr: png_structp; info_ptr: png_infop;
var width, height: png_uint_32; var bit_depth,
color_type, interlace_type, compression_type,
filter_type: int): png_uint_32;
stdcall;
function png_get_PLTE(png_ptr: png_structp; info_ptr: png_infop;
var palette: png_colorp; var num_palette: int):
png_uint_32;
stdcall;
function png_get_bKGD(png_ptr: png_structp; info_ptr: png_infop;
var background: png_color_16p): png_uint_32;
stdcall;
function png_get_bit_depth(png_ptr: png_structp; info_ptr: png_infop):
png_byte;
stdcall;
function png_get_cHRM(png_ptr: png_structp; info_ptr: png_infop;
var white_x, white_y, red_x, red_y, green_x, green_y,
blue_x, blue_y: double): png_uint_32;
stdcall;
function png_get_channels(png_ptr: png_structp; info_ptr: png_infop):
png_byte;
stdcall;
function png_get_color_type(png_ptr: png_structp; info_ptr: png_infop):
png_byte;
stdcall;
function png_get_compression_type(png_ptr: png_structp;
info_ptr: png_infop): png_byte;
stdcall;
function png_get_error_ptr(png_ptr: png_structp): png_voidp;
stdcall;
function png_get_filter_type(png_ptr: png_structp; info_ptr: png_infop):
png_byte;
stdcall;
function png_get_gAMA(png_ptr: png_structp; info_ptr: png_infop;
var file_gamma: double): png_uint_32;
stdcall;
function png_get_hIST(png_ptr: png_structp; info_ptr: png_infop;
var hist: png_uint_16p): png_uint_32;
stdcall;
function png_get_image_height(png_ptr: png_structp; info_ptr: png_infop):
png_uint_32;
stdcall;
function png_get_image_width(png_ptr: png_structp; info_ptr: png_infop):
png_uint_32;
stdcall;
function png_get_interlace_type(png_ptr: png_structp;
info_ptr: png_infop): png_byte;
stdcall;
function png_get_io_ptr(png_ptr: png_structp): png_voidp;
stdcall;
function png_get_oFFs(png_ptr: png_structp; info_ptr: png_infop;
var offset_x, offset_y: png_uint_32;
var unit_type: int): png_uint_32;
stdcall;
function png_get_sCAL(png_ptr: png_structp; info_ptr: png_infop;
var unit:int; var width: png_uint_32; height: png_uint_32):
png_uint_32;
stdcall
function png_get_pCAL(png_ptr: png_structp; info_ptr: png_infop;
var purpose: png_charp; var X0, X1: png_int_32;
var typ, nparams: int; var units: png_charp;
var params: png_charpp): png_uint_32;
stdcall;
function png_get_pHYs(png_ptr: png_structp; info_ptr: png_infop;
var res_x, res_y: png_uint_32; var unit_type: int):
png_uint_32;
stdcall;
function png_get_pixel_aspect_ratio(png_ptr: png_structp;
info_ptr: png_infop): float;
stdcall;
function png_get_pixels_per_meter(png_ptr: png_structp;
info_ptr: png_infop): png_uint_32;
stdcall;
function png_get_progressive_ptr(png_ptr: png_structp): png_voidp;
stdcall;
function png_get_rgb_to_gray_status(png_ptr: png_structp);
stdcall;
function png_get_rowbytes(png_ptr: png_structp; info_ptr: png_infop):
png_uint_32;
stdcall;
function png_get_rows(png_ptr: png_structp; info_ptr: png_infop):
png_bytepp;
stdcall;
function png_get_sBIT(png_ptr: png_structp; info_ptr: png_infop;
var sig_bits: png_color_8p): png_uint_32;
stdcall;
function png_get_sRGB(png_ptr: png_structp; info_ptr: png_infop;
var file_srgb_intent: int): png_uint_32;
stdcall;
function png_get_signature(png_ptr: png_structp; info_ptr: png_infop):
png_bytep;
stdcall;
function png_get_tIME(png_ptr: png_structp; info_ptr: png_infop;
var mod_time: png_timep): png_uint_32;
stdcall;
function png_get_tRNS(png_ptr: png_structp; info_ptr: png_infop;
var trans: png_bytep; var num_trans: int;
var trans_values: png_color_16p): png_uint_32;
stdcall;
function png_get_text(png_ptr: png_structp; info_ptr: png_infop;
var text_ptr: png_textp; var num_text: int):
png_uint_32;
stdcall;
function png_get_user_chunk_ptr(png_ptr: png_structp):
png_voidp;
stdcall;
function png_get_valid(png_ptr: png_structp; info_ptr: png_infop;
flag: png_uint_32): png_uint_32;
stdcall;
function png_get_x_offset_microns(png_ptr: png_structp;
info_ptr: png_infop): png_uint_32;
stdcall;
function png_get_x_offset_pixels(png_ptr: png_structp;
info_ptr: png_infop): png_uint_32;
stdcall;
function png_get_x_pixels_per_meter(png_ptr: png_structp;
info_ptr: png_infop): png_uint_32;
stdcall;
function png_get_y_offset_microns(png_ptr: png_structp;
info_ptr: png_infop): png_uint_32;
stdcall;
function png_get_y_offset_pixels(png_ptr: png_structp;
info_ptr: png_infop): png_uint_32;
stdcall;
function png_get_y_pixels_per_meter(png_ptr: png_structp;
info_ptr: png_infop): png_uint_32;
stdcall;
procedure png_process_data(png_ptr: png_structp; info_ptr: png_infop;
buffer: png_bytep; buffer_size: png_size_t);
stdcall;
procedure png_progressive_combine_row(png_ptr: png_structp;
old_row, new_row: png_bytep);
stdcall;
procedure png_read_end(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_read_image(png_ptr: png_structp; image: png_bytepp);
stdcall;
procedure png_read_info(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_read_row(png_ptr: png_structp; row, dsp_row: png_bytep);
stdcall;
procedure png_read_rows(png_ptr: png_structp; row, display_row:
png_bytepp; num_rows: png_uint_32);
stdcall;
procedure png_read_update_info(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_set_IHDR(png_ptr: png_structp; info_ptr: png_infop;
width, height: png_uint_32; bit_depth, color_type,
interlace_type, compression_type, filter_type: int);
stdcall;
procedure png_set_PLTE(png_ptr: png_structp; info_ptr: png_infop;
palette: png_colorp; num_palette: int);
stdcall;
procedure png_set_bKGD(png_ptr: png_structp; info_ptr: png_infop;
background: png_color_16p);
stdcall;
procedure png_set_background(png_ptr: png_structp;
background_color: png_color_16p;
background_gamma_code, need_expand: int;
background_gamma: double);
stdcall;
procedure png_set_bgr(png_ptr: png_structp);
stdcall;
procedure png_set_cHRM(png_ptr: png_structp; info_ptr: png_infop;
white_x, white_y, red_x, red_y, green_x, green_y,
blue_x, blue_y: double);
stdcall;
procedure png_set_cHRM_fixed(png_ptr: png_structp; info_ptr: png_infop;
white_x, white_y, red_x, red_y, green_x, green_y,
blue_x, blue_y: png_fixed_point);
stdcall;
procedure png_set_compression_level(png_ptr: png_structp; level: int);
stdcall;
procedure png_set_compression_mem_level(png_ptr: png_structp;
mem_level: int);
stdcall;
procedure png_set_compression_method(png_ptr: png_structp; method: int);
stdcall;
procedure png_set_compression_strategy(png_ptr: png_structp;
strategy: int);
stdcall;
procedure png_set_compression_window_bits(png_ptr: png_structp;
window_bits: int);
stdcall;
procedure png_set_crc_action(png_ptr: png_structp;
crit_action, ancil_action: int);
stdcall;
procedure png_set_dither(png_ptr: png_structp; plaette: png_colorp;
num_palette, maximum_colors: int;
histogram: png_uint_16p; full_dither: int);
stdcall;
procedure png_set_error_fn(png_ptr: png_structp; error_ptr: png_voidp;
error_fn, warning_fn: png_error_ptr);
stdcall;
procedure png_set_expand(png_ptr: png_structp);
stdcall;
procedure png_set_filler(png_ptr: png_structp; filler: png_uint_32;
filler_loc: int);
stdcall;
procedure png_set_filter(png_ptr: png_structp; method, filters: int);
stdcall;
procedure png_set_filter_heuristics(png_ptr: png_structp;
heuristic_method, num_weights: int;
filter_weights, filter_costs: png_doublep);
stdcall;
procedure png_set_flush(png_ptr: png_structp; nrows: int);
stdcall;
procedure png_set_gAMA(png_ptr: png_structp; info_ptr: png_infop;
file_gamma: double);
stdcall;
procedure png_set_gAMA_fixed(png_ptr: png_structp; info_ptr: png_infop;
file_gamma: png_fixed_point);
stdcall;
procedure png_set_gamma(png_ptr: png_structp; screen_gamma,
default_file_gamma: double);
stdcall;
procedure png_set_gray_1_2_4_to_8(png_ptr: png_structp);
stdcall;
procedure png_set_gray_to_rgb(png_ptr: png_structp);
stdcall;
procedure png_set_hIST(png_ptr: png_structp; info_ptr: png_infop;
hist: png_uint_16p);
stdcall;
function png_set_interlace_handling(png_ptr: png_structp): int;
stdcall;
procedure png_set_invalid(png_ptr: png_structp; info_ptr:png_infop;
mask: int);
stdcall;
procedure png_set_invert_alpha(png_ptr: png_structp);
stdcall;
procedure png_set_invert_mono(png_ptr: png_structp);
stdcall;
procedure png_set_oFFs(png_ptr: png_structp; info_ptr: png_infop;
offset_x, offset_y: png_uint_32; unit_type: int);
stdcall;
procedure png_set_palette_to_rgb(png_ptr: png_structp);
stdcall;
procedure png_set_pCAL(png_ptr: png_structp; info_ptr: png_infop;
purpose: png_charp; X0, X1: png_int_32;
typ, nparams: int; units: png_charp;
params: png_charpp);
stdcall;
procedure png_set_pHYs(png_ptr: png_structp; info_ptr: png_infop;
res_x, res_y: png_uint_32; unit_type: int);
stdcall;
procedure png_set_packing(png_ptr: png_structp);
stdcall;
procedure png_set_packswap(png_ptr: png_structp);
stdcall;
procedure png_set_progressive_read_fn(png_ptr: png_structp;
progressive_ptr: png_voidp;
info_fn: png_progressive_info_ptr;
row_fn: png_progressive_row_ptr;
end_fn: png_progressive_end_ptr);
stdcall;
procedure png_set_read_fn(png_ptr: png_structp;
io_ptr: png_voidp; read_data_fn: png_rw_ptr);
stdcall;
procedure png_set_read_status_fn(png_ptr: png_structp;
read_row_fn: png_read_status_ptr);
stdcall;
procedure png_set_read_user_chunk_fn(png_ptr: png_structp;
read_user_chunk_fn: png_user_chunk_ptr);
stdcall;
procedure png_set_read_user_transform_fn(png_ptr: png_structp;
read_user_transform_fn: png_user_transform_ptr);
stdcall;
procedure png_set_rgb_to_gray(png_ptr: png_structp; int: error_action;
red_weight, green_weight: double);
stdcall;
procedure png_set_rgb_to_gray_fixed(png_ptr: png_structp; int: error_action;
red_weight, green_weight: png_fixed_point);
stdcall;
procedure png_set_rows(png_ptr: png_structp; info_ptr: png_infop;
row_pointers: png_bytepp);
stdcall;
procedure png_set_sBIT(png_ptr: png_structp; info_ptr: png_infop;
sig_bits: png_color_8p);
stdcall;
procedure png_set_sRGB(png_ptr: png_structp; info_ptr: png_infop;
intent: int);
stdcall;
procedure png_set_sRGB_gAMA_and_cHRM(png_ptr: png_structp;
info_ptr: png_infop; intent: int);
stdcall;
procedure png_set_shift(png_ptr: png_structp; true_bits: png_color_8p);
stdcall;
procedure png_set_sig_bytes(png_ptr: png_structp; num_bytes: int);
stdcall;
procedure png_set_strip_16(png_ptr: png_structp);
stdcall;
procedure png_set_strip_alpha(png_ptr: png_structp);
stdcall;
procedure png_set_swap(png_ptr: png_structp);
stdcall;
procedure png_set_swap_alpha(png_ptr: png_structp);
stdcall;
procedure png_set_tIME(png_ptr: png_structp; info_ptr: png_infop;
mod_time: png_timep);
stdcall;
procedure png_set_tRNS(png_ptr: png_structp; info_ptr: png_infop;
trans: png_bytep; num_trans: int;
trans_values: png_color_16p);
stdcall;
procedure png_set_tRNS_to_alpha(png_ptr: png_structp);
stdcall;
procedure png_set_text(png_ptr: png_structp; info_ptr: png_infop;
text_ptr: png_textp; num_text: int);
stdcall;
procedure png_set_write_fn(png_ptr: png_structp;
io_ptr: png_voidp; write_data_fn: png_rw_ptr;
output_flush_fn: png_flush_ptr);
stdcall;
procedure png_set_write_status_fn(png_ptr: png_structp;
write_row_fn: png_write_status_ptr);
stdcall;
procedure png_set_write_user_transform_fn(png_ptr: png_structp;
write_user_transform_fn: png_user_transform_ptr);
stdcall;
function png_sig_cmp(sig: png_bytep; start, num_to_check: png_size_t):
int;
stdcall;
procedure png_start_read_image(png_ptr: png_structp);
stdcall;
procedure png_write_chunk(png_ptr: png_structp;
chunk_name, data: png_bytep; length: png_size_t);
stdcall;
procedure png_write_chunk_data(png_ptr: png_structp;
data: png_bytep; length: png_size_t);
stdcall;
procedure png_write_chunk_end(png_ptr: png_structp);
stdcall;
procedure png_write_chunk_start(png_ptr: png_structp;
chunk_name: png_bytep; length: png_uint_32);
stdcall;
procedure png_write_end(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_write_flush(png_ptr: png_structp);
stdcall;
procedure png_write_image(png_ptr: png_structp; image: png_bytepp);
stdcall;
procedure png_write_info(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_write_info_before_PLTE(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_write_row(png_ptr: png_structp; row: png_bytep);
stdcall;
procedure png_write_rows(png_ptr: png_structp; row: png_bytepp;
num_rows: png_uint_32);
stdcall;
procedure png_get_iCCP(png_ptr: png_structp; info_ptr: png_infop;
name: png_charpp; compression_type: int *; profile: png_charpp;
proflen: png_int_32): png_bytep;
stdcall;
procedure png_get_sPLT(png_ptr: png_structp;
info_ptr: png_infop; entries: png_spalette_pp): png_uint_32;
stdcall;
procedure png_set_iCCP(png_ptr: png_structp; info_ptr: png_infop;
name: png_charp; compression_type: int; profile: png_charp;
proflen: int);
stdcall;
procedure png_free_data(png_ptr: png_structp; info_ptr: png_infop; num: int);
stdcall;
procedure png_set_sPLT(png_ptr: png_structp; info_ptr: png_infop;
entries: png_spalette_p; nentries: int);
stdcall;
implementation
const
pngDLL = 'png32bd.dll';
procedure png_build_grayscale_palette; external pngDLL;
function png_check_sig; external pngDLL;
procedure png_chunk_error; external pngDLL;
procedure png_chunk_warning; external pngDLL;
procedure png_convert_from_time_t; external pngDLL;
function png_convert_to_rfc1123; external pngDLL;
function png_create_info_struct; external pngDLL;
function png_create_read_struct; external pngDLL;
function png_create_write_struct; external pngDLL;
procedure png_destroy_info_struct; external pngDLL;
procedure png_destroy_read_struct; external pngDLL;
procedure png_destroy_write_struct; external pngDLL;
function png_get_IHDR; external pngDLL;
function png_get_PLTE; external pngDLL;
function png_get_bKGD; external pngDLL;
function png_get_bit_depth; external pngDLL;
function png_get_cHRM; external pngDLL;
function png_get_channels; external pngDLL;
function png_get_color_type; external pngDLL;
function png_get_compression_type; external pngDLL;
function png_get_error_ptr; external pngDLL;
function png_get_filter_type; external pngDLL;
function png_get_gAMA; external pngDLL;
function png_get_hIST; external pngDLL;
function png_get_image_height; external pngDLL;
function png_get_image_width; external pngDLL;
function png_get_interlace_type; external pngDLL;
function png_get_io_ptr; external pngDLL;
function png_get_oFFs; external pngDLL;
function png_get_pCAL; external pngDLL;
function png_get_pHYs; external pngDLL;
function png_get_pixel_aspect_ratio; external pngDLL;
function png_get_pixels_per_meter; external pngDLL;
function png_get_progressive_ptr; external pngDLL;
function png_get_rowbytes; external pngDLL;
function png_get_rows; external pngDLL;
function png_get_sBIT; external pngDLL;
function png_get_sRGB; external pngDLL;
function png_get_signature; external pngDLL;
function png_get_tIME; external pngDLL;
function png_get_tRNS; external pngDLL;
function png_get_text; external pngDLL;
function png_get_user_chunk_ptr; external pngDLL;
function png_get_valid; external pngDLL;
function png_get_x_offset_microns; external pngDLL;
function png_get_x_offset_pixels; external pngDLL;
function png_get_x_pixels_per_meter; external pngDLL;
function png_get_y_offset_microns; external pngDLL;
function png_get_y_offset_pixels; external pngDLL;
function png_get_y_pixels_per_meter; external pngDLL;
procedure png_process_data; external pngDLL;
procedure png_progressive_combine_row; external pngDLL;
procedure png_read_end; external pngDLL;
procedure png_read_image; external pngDLL;
procedure png_read_info; external pngDLL;
procedure png_read_row; external pngDLL;
procedure png_read_rows; external pngDLL;
procedure png_read_update_info; external pngDLL;
procedure png_set_IHDR; external pngDLL;
procedure png_set_PLTE; external pngDLL;
procedure png_set_bKGD; external pngDLL;
procedure png_set_background; external pngDLL;
procedure png_set_bgr; external pngDLL;
procedure png_set_cHRM; external pngDLL;
procedure png_set_cHRM_fixed; external pngDLL;
procedure png_set_compression_level; external pngDLL;
procedure png_set_compression_mem_level; external pngDLL;
procedure png_set_compression_method; external pngDLL;
procedure png_set_compression_strategy; external pngDLL;
procedure png_set_compression_window_bits; external pngDLL;
procedure png_set_crc_action; external pngDLL;
procedure png_set_dither; external pngDLL;
procedure png_set_error_fn; external pngDLL;
procedure png_set_expand; external pngDLL;
procedure png_set_filler; external pngDLL;
procedure png_set_filter; external pngDLL;
procedure png_set_filter_heuristics; external pngDLL;
procedure png_set_flush; external pngDLL;
procedure png_set_gAMA; external pngDLL;
procedure png_set_gAMA_fixed; external pngDLL;
procedure png_set_gamma; external pngDLL;
procedure png_set_gray_to_rgb; external pngDLL;
procedure png_set_hIST; external pngDLL;
function png_set_interlace_handling; external pngDLL;
procedure png_set_invert_alpha; external pngDLL;
procedure png_set_invert_mono; external pngDLL;
procedure png_set_oFFs; external pngDLL;
procedure png_set_pCAL; external pngDLL;
procedure png_set_pHYs; external pngDLL;
procedure png_set_packing; external pngDLL;
procedure png_set_packswap; external pngDLL;
procedure png_set_progressive_read_fn; external pngDLL;
procedure png_set_read_fn; external pngDLL;
procedure png_set_read_status_fn; external pngDLL;
procedure png_set_read_user_transform_fn; external pngDLL;
procedure png_set_rgb_to_gray; external pngDLL;
procedure png_set_rgb_to_gray_fixed; external pngDLL;
procedure png_set_rows; external pngDLL;
procedure png_set_sBIT; external pngDLL;
procedure png_set_sRGB; external pngDLL;
procedure png_set_sRGB_gAMA_and_cHRM; external pngDLL;
procedure png_set_shift; external pngDLL;
procedure png_set_sig_bytes; external pngDLL;
procedure png_set_strip_16; external pngDLL;
procedure png_set_strip_alpha; external pngDLL;
procedure png_set_swap; external pngDLL;
procedure png_set_swap_alpha; external pngDLL;
procedure png_set_tIME; external pngDLL;
procedure png_set_tRNS; external pngDLL;
procedure png_set_text; external pngDLL;
procedure png_set_user_chunk_fn; external pngDLL;
procedure png_set_write_fn; external pngDLL;
procedure png_set_write_status_fn; external pngDLL;
procedure png_set_write_user_transform_fn; external pngDLL;
function png_sig_cmp; external pngDLL;
procedure png_start_read_image; external pngDLL;
procedure png_write_chunk; external pngDLL;
procedure png_write_chunk_data; external pngDLL;
procedure png_write_chunk_end; external pngDLL;
procedure png_write_chunk_start; external pngDLL;
procedure png_write_end; external pngDLL;
procedure png_write_flush; external pngDLL;
procedure png_write_image; external pngDLL;
procedure png_write_info; external pngDLL;
procedure png_write_info_before_PLTE; external pngDLL;
procedure png_write_row; external pngDLL;
procedure png_write_rows; external pngDLL;
procedure png_get_iCCP; external pngDLL;
procedure png_get_sPLT; external pngDLL;
procedure png_set_iCCP; external pngDLL;
procedure png_set_sPLT; external pngDLL;
procedure png_free_data; external pngDLL;
end.