(*
* libpng pascal headers
* Version: 1.2.12
*)
{$IFDEF FPC}
{$ifndef NO_SMART_LINK}
{$smartlink on}
{$endif}
{$ENDIF}
{$IFDEF DARWIN}
{$linklib libpng}
{$ENDIF}
unit png;
interface
{$IFDEF FPC}
{$MODE DELPHI}
{$PACKRECORDS C}
{$ENDIF}
uses
{$IFDEF MSWINDOWS}
Windows,
{$ENDIF}
{$IFDEF UNIX}
baseunix,
{$ENDIF}
zlib;
const
{$ifdef MSWINDOWS}
// use libpng12-0 (Version 1.2.18), delivered wih SDL_Image
LibPng = 'libpng12-0'; // 'libpng13';
// matching lib version for libpng13.dll, needed for initialization
PNG_LIBPNG_VER_STRING='1.2.12';
// define the compiler that was used to built the DLL (necessary for jmp_buf)
// SDL_Image was compiled with GCC
//{$define MSVC_DLL} // MS Visual C++
{$define GCC_DLL} // GCC
{$else}
LibPng = 'png';
// matching lib version for libpng, needed for initialization
PNG_LIBPNG_VER_STRING='1.2.12';
{$endif}
{$ifdef MSWINDOWS}
const
// JB_LEN (#elements in jmp_buf) depends on the compiler used to compile the DLL
// MSVC++: 16 (x86/AMD64), GCC: 52
{$if Defined(MSVC_DLL)}
JB_LEN = 16;
{$elseif Defined(GCC_DLL)}
JB_LEN = 52;
{$else}
JB_LEN = 0;
{$ifend}
{$endif}
type
{$IFNDEF FPC}
// defines for Delphi
size_t = longword;
{$ENDIF}
{$ifdef MSWINDOWS}
{$if JB_LEN > 0}
jmp_buf = array[0..JB_LEN-1] of integer;
// the png_struct cannot be accessed if the size of jmp_buf is unknown
{$define UsePngStruct}
{$ifend}
// Do NOT use time_t on windows! It might be 32 or 64bit, depending on the compiler and system.
// MSVS-2005 starts using 64bit for time_t on x86 by default, but GCC uses just 32bit.
//time_t = longint;
{$endif}
z_stream = TZStream;
png_uint_32 = dword;
png_int_32 = longint;
png_uint_16 = word;
png_int_16 = smallint;
png_byte = byte;
ppng_uint_32 = ^png_uint_32;
ppng_int_32 = ^png_int_32;
ppng_uint_16 = ^png_uint_16;
ppng_int_16 = ^png_int_16;
ppng_byte = ^png_byte;
pppng_uint_32 = ^ppng_uint_32;
pppng_int_32 = ^ppng_int_32;
pppng_uint_16 = ^ppng_uint_16;
pppng_int_16 = ^ppng_int_16;
pppng_byte = ^ppng_byte;
png_size_t = size_t;
png_fixed_point = png_int_32;
ppng_fixed_point = ^png_fixed_point;
pppng_fixed_point = ^ppng_fixed_point;
png_voidp = pointer;
png_bytep = Ppng_byte;
ppng_bytep = ^png_bytep;
png_uint_32p = Ppng_uint_32;
png_int_32p = Ppng_int_32;
png_uint_16p = Ppng_uint_16;
ppng_uint_16p = ^png_uint_16p;
png_int_16p = Ppng_int_16;
png_const_charp = {const} Pchar;
png_charp = Pchar;
ppng_charp = ^png_charp;
png_fixed_point_p = Ppng_fixed_point;
png_FILE_p = Pointer;
png_doublep = Pdouble;
png_bytepp = PPpng_byte;
png_uint_32pp = PPpng_uint_32;
png_int_32pp = PPpng_int_32;
png_uint_16pp = PPpng_uint_16;
png_int_16pp = PPpng_int_16;
png_const_charpp = {const} PPchar;
png_charpp = PPchar;
ppng_charpp = ^png_charpp;
png_fixed_point_pp = PPpng_fixed_point;
PPDouble = ^PDouble;
png_doublepp = PPdouble;
PPPChar = ^PPCHar;
png_charppp = PPPchar;
Pcharf = Pchar;
PPcharf = ^Pcharf;
png_zcharp = Pcharf;
png_zcharpp = PPcharf;
png_zstreamp = Pzstream;
const
(* Maximum positive integer used in PNG is (2^31)-1 *)
PNG_UINT_31_MAX = (png_uint_32($7fffffff));
PNG_UINT_32_MAX = (png_uint_32(-1));
PNG_SIZE_MAX = (png_size_t(-1));
{$if defined(PNG_1_0_X) or defined (PNG_1_2_X)}
(* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. *)
PNG_MAX_UINT = PNG_UINT_31_MAX;
{$ifend}
(* 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);
(* aliases *)
PNG_COLOR_TYPE_RGBA = PNG_COLOR_TYPE_RGB_ALPHA;
PNG_COLOR_TYPE_GA = PNG_COLOR_TYPE_GRAY_ALPHA;
(* This is for compression type. PNG 1.0-1.2 only define 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 1.0-1.2 only define the single type. *)
PNG_FILTER_TYPE_BASE = 0; (* Single row per-byte filtering *)
PNG_INTRAPIXEL_DIFFERENCING = 64; (* Used only in MNG datastreams *)
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 *)
PNG_INTERLACE_LAST = 2; (* Not a valid value *)
(* 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) *)
PNG_OFFSET_LAST = 2; (* Not a valid value *)
(* 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 *)
PNG_EQUATION_LAST = 4; (* Not a valid value *)
(* These are for the sCAL chunk. These values should NOT be changed. *)
PNG_SCALE_UNKNOWN = 0; (* unknown unit (image scale) *)
PNG_SCALE_METER = 1; (* meters per pixel *)
PNG_SCALE_RADIAN = 2; (* radians per pixel *)
PNG_SCALE_LAST = 3; (* Not a valid value *)
(* 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 *)
PNG_RESOLUTION_LAST = 2; (* Not a valid value *)
(* 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;
PNG_sRGB_INTENT_LAST = 4; (* Not a valid value *)
(* This is for text chunks *)
PNG_KEYWORD_MAX_LENGTH = 79;
(* Maximum number of entries in PLTE/sPLT/tRNS arrays *)
PNG_MAX_PALETTE_LENGTH = 256;
(* These determine if an ancillary chunk's data has been successfully read
* from the PNG header, or if the application has filled in the corresponding
* data in the info_struct to be written into the output file. The values
* of the PNG_INFO_<chunk> defines should NOT be changed.
*)
PNG_INFO_gAMA = $0001;
PNG_INFO_sBIT = $0002;
PNG_INFO_cHRM = $0004;
PNG_INFO_PLTE = $0008;
PNG_INFO_tRNS = $0010;
PNG_INFO_bKGD = $0020;
PNG_INFO_hIST = $0040;
PNG_INFO_pHYs = $0080;
PNG_INFO_oFFs = $0100;
PNG_INFO_tIME = $0200;
PNG_INFO_pCAL = $0400;
PNG_INFO_sRGB = $0800; (* GR-P, 0.96a *)
PNG_INFO_iCCP = $1000; (* ESR, 1.0.6 *)
PNG_INFO_sPLT = $2000; (* ESR, 1.0.6 *)
PNG_INFO_sCAL = $4000; (* ESR, 1.0.6 *)
PNG_INFO_IDAT = $8000; (* ESR, 1.0.6 *)
(*
var
png_libpng_ver : array[0..11] of char; external LibPng name 'png_libpng_ver';
png_pass_start : array[0..6] of integer; external LibPng name 'png_pass_start';
png_pass_inc : array[0..6] of integer; external LibPng name 'png_pass_inc';
png_pass_ystart : array[0..6] of integer; external LibPng name 'png_pass_ystart';
png_pass_yinc : array[0..6] of integer; external LibPng name 'png_pass_yinc';
png_pass_mask : array[0..6] of integer; external LibPng name 'png_pass_mask';
png_pass_dsp_mask : array[0..6] of integer; external LibPng name 'png_pass_dsp_mask';
*)
type
(* Three color definitions. The order of the red, green, and blue, (and the
* exact size) is not important, although the size of the fields need to
* be png_byte or png_uint_16 (as defined below).
*)
png_color = record
red : png_byte;
green : png_byte;
blue : png_byte;
end;
ppng_color = ^png_color;
pppng_color = ^ppng_color;
png_color_struct = png_color;
png_colorp = Ppng_color;
ppng_colorp = ^png_colorp;
png_colorpp = PPpng_color;
png_color_16 = record
index : png_byte; (* used for palette files *)
red : png_uint_16; (* for use in red green blue files *)
green : png_uint_16;
blue : png_uint_16;
gray : png_uint_16; (* for use in grayscale files *)
end;
ppng_color_16 = ^png_color_16 ;
pppng_color_16 = ^ppng_color_16 ;
png_color_16_struct = png_color_16;
png_color_16p = Ppng_color_16;
ppng_color_16p = ^png_color_16p;
png_color_16pp = PPpng_color_16;
png_color_8 = record
red : png_byte; (* for use in red green blue files *)
green : png_byte;
blue : png_byte;
gray : png_byte; (* for use in grayscale files *)
alpha : png_byte; (* for alpha channel files *)
end;
ppng_color_8 = ^png_color_8;
pppng_color_8 = ^ppng_color_8;
png_color_8_struct = png_color_8;
png_color_8p = Ppng_color_8;
ppng_color_8p = ^png_color_8p;
png_color_8pp = PPpng_color_8;
(*
* The following two structures are used for the in-core representation
* of sPLT chunks.
*)
png_sPLT_entry = record
red : png_uint_16;
green : png_uint_16;
blue : png_uint_16;
alpha : png_uint_16;
frequency : png_uint_16;
end;
ppng_sPLT_entry = ^png_sPLT_entry;
pppng_sPLT_entry = ^ppng_sPLT_entry;
png_sPLT_entry_struct = png_sPLT_entry;
png_sPLT_entryp = Ppng_sPLT_entry;
png_sPLT_entrypp = PPpng_sPLT_entry;
(* When the depth of the sPLT palette is 8 bits, the color and alpha samples
* occupy the LSB of their respective members, and the MSB of each member
* is zero-filled. The frequency member always occupies the full 16 bits.
*)
png_sPLT_t = record
name : png_charp; (* palette name *)
depth : png_byte; (* depth of palette samples *)
entries : png_sPLT_entryp; (* palette entries *)
nentries : png_int_32; (* number of palette entries *)
end;
ppng_sPLT_t = ^png_sPLT_t;
pppng_sPLT_t = ^ppng_sPLT_t;
png_sPLT_struct = png_sPLT_t;
png_sPLT_tp = Ppng_sPLT_t;
png_sPLT_tpp = PPpng_sPLT_t;
(* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
* and whether that contents is compressed or not. The "key" field
* points to a regular zero-terminated C string. The "text", "lang", and
* "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
* However, the * structure returned by png_get_text() will always contain
* regular zero-terminated C strings (possibly empty), never NULL pointers,
* so they can be safely used in printf() and other string-handling functions.
*)
png_text = record
compression : integer; (* compression value:
-1: tEXt, none
0: zTXt, deflate
1: iTXt, none
2: iTXt, deflate *)
key : png_charp; (* keyword, 1-79 character description of "text" *)
text : png_charp; (* comment, may be an empty string (ie "")
or a NULL pointer *)
text_length : png_size_t; (* length of the text string *)
end;
ppng_text = ^png_text;
pppng_text = ^ppng_text;
png_text_struct = png_text;
png_textp = Ppng_text;
ppng_textp = ^png_textp;
png_textpp = PPpng_text;
(* png_time is a way to hold the time in an machine independent way.
* Two conversions are provided, both from time_t and struct tm. There
* is no portable way to convert to either of these structures, as far
* as I know. If you know of a portable way, send it to me. As a side
* note - PNG has always been Year 2000 compliant!
*)
png_time = record
year : png_uint_16; (* full year, as in, 1995 *)
month : png_byte; (* month of year, 1 - 12 *)
day : png_byte; (* day of month, 1 - 31 *)
hour : png_byte; (* hour of day, 0 - 23 *)
minute : png_byte; (* minute of hour, 0 - 59 *)
second : png_byte; (* second of minute, 0 - 60 (for leap seconds) *)
end;
ppng_time = ^png_time;
pppng_time = ^ppng_time;
png_time_struct = png_time;
png_timep = Ppng_time;
PPNG_TIMEP = ^PNG_TIMEP;
png_timepp = PPpng_time;
const
PNG_CHUNK_NAME_LENGTH = 5;
type
(* png_unknown_chunk is a structure to hold queued chunks for which there is
* no specific support. The idea is that we can use this to queue
* up private chunks for output even though the library doesn't actually
* know about their semantics.
*)
png_unknown_chunk = record
name : array[0..PNG_CHUNK_NAME_LENGTH-1] of png_byte;
data : Ppng_byte;
size : png_size_t;
(* libpng-using applications should NOT directly modify this byte. *)
location : png_byte; (* mode of operation at read time *)
end;
ppng_unknown_chunk = ^png_unknown_chunk;
pppng_unknown_chunk = ^ppng_unknown_chunk;
png_unknown_chunk_t = png_unknown_chunk;
png_unknown_chunkp = Ppng_unknown_chunk;
png_unknown_chunkpp = PPpng_unknown_chunk;
(* png_info is a structure that holds the information in a PNG file so
* that the application can find out the characteristics of the image.
* If you are reading the file, this structure will tell you what is
* in the PNG file. If you are writing the file, fill in the information
* you want to put into the PNG file, then call png_write_info().
* The names chosen should be very close to the PNG specification, so
* consult that document for information about the meaning of each field.
*
* With libpng < 0.95, it was only possible to directly set and read the
* the values in the png_info_struct, which meant that the contents and
* order of the values had to remain fixed. With libpng 0.95 and later,
* however, there are now functions that abstract the contents of
* png_info_struct from the application, so this makes it easier to use
* libpng with dynamic libraries, and even makes it possible to use
* libraries that don't have all of the libpng ancillary chunk-handing
* functionality.
*
* In any case, the order of the parameters in png_info_struct should NOT
* be changed for as long as possible to keep compatibility with applications
* that use the old direct-access method with png_info_struct.
*
* The following members may have allocated storage attached that should be
* cleaned up before the structure is discarded: palette, trans, text,
* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
* splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
* are automatically freed when the info structure is deallocated, if they were
* allocated internally by libpng. This behavior can be changed by means
* of the png_data_freer() function.
*
* More allocation details: all the chunk-reading functions that
* change these members go through the corresponding png_set_*
* functions. A function to clear these members is available: see
* png_free_data(). The png_set_* functions do not depend on being
* able to point info structure members to any of the storage they are
* passed (they make their own copies), EXCEPT that the png_set_text
* functions use the same storage passed to them in the text_ptr or
* itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
* functions do not make their own copies.
*)
png_info = record
width : png_uint_32; (* width of image in pixels (from IHDR) *)
height : png_uint_32; (* height of image in pixels (from IHDR) *)
valid : png_uint_32; (* valid chunk data (see PNG_INFO_ below) *)
rowbytes : png_uint_32; (* bytes needed to hold an untransformed row *)
palette : png_colorp; (* array of color values (valid & PNG_INFO_PLTE) *)
num_palette : png_uint_16; (* number of color entries in "palette" (PLTE) *)
num_trans : png_uint_16; (* number of transparent palette color (tRNS) *)
bit_depth : png_byte; (* 1, 2, 4, 8, or 16 bits/channel (from IHDR) *)
color_type : png_byte; (* see PNG_COLOR_TYPE_ below (from IHDR) *)
(* The following three should have been named *_method not *_type *)
compression_type : png_byte; (* must be PNG_COMPRESSION_TYPE_BASE (IHDR) *)
filter_type : png_byte; (* must be PNG_FILTER_TYPE_BASE (from IHDR) *)
interlace_type : png_byte; (* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 *)
(* The following is informational only on read, and not used on writes. *)
channels : png_byte; (* number of data channels per pixel (1, 2, 3, 4) *)
pixel_depth : png_byte; (* number of bits per pixel *)
spare_byte : png_byte; (* to align the data, and for future use *)
signature : array[0..7] of png_byte; (* magic bytes read by libpng from start of file *)
(* The rest of the data is optional. If you are reading, check the
* valid field to see if the information in these are valid. If you
* are writing, set the valid field to those chunks you want written,
* and initialize the appropriate fields below.
*)
gamma : single;
srgb_intent : png_byte;
num_text : integer;
max_text : integer;
text : png_textp;
mod_time : png_time;
sig_bit : png_color_8;
trans : png_bytep;
trans_values : png_color_16;
background : png_color_16;
x_offset : png_int_32;
y_offset : png_int_32;
offset_unit_type : png_byte;
x_pixels_per_unit : png_uint_32;
y_pixels_per_unit : png_uint_32;
phys_unit_type : png_byte;
hist : png_uint_16p;
x_white : single;
y_white : single;
x_red : single;
y_red : single;
x_green : single;
y_green : single;
x_blue : single;
y_blue : single;
pcal_purpose : png_charp;
pcal_X0 : png_int_32;
pcal_X1 : png_int_32;
pcal_units : png_charp;
pcal_params : png_charpp;
pcal_type : png_byte;
pcal_nparams : png_byte;
free_me : png_uint_32;
unknown_chunks : png_unknown_chunkp;
unknown_chunks_num : png_size_t;
iccp_name : png_charp;
iccp_profile : png_charp;
iccp_proflen : png_uint_32;
iccp_compression : png_byte;
splt_palettes : png_sPLT_tp;
splt_palettes_num : png_uint_32;
scal_unit : png_byte;
scal_pixel_width : double;
scal_pixel_height : double;
scal_s_width : png_charp;
scal_s_height : png_charp;
row_pointers : png_bytepp;
int_gamma : png_fixed_point;
int_x_white : png_fixed_point;
int_y_white : png_fixed_point;
int_x_red : png_fixed_point;
int_y_red : png_fixed_point;
int_x_green : png_fixed_point;
int_y_green : png_fixed_point;
int_x_blue : png_fixed_point;
int_y_blue : png_fixed_point;
end;
ppng_info = ^png_info;
pppng_info = ^ppng_info;
png_info_struct = png_info;
png_infop = Ppng_info;
png_infopp = PPpng_info;
(* This is used for the transformation routines, as some of them
* change these values for the row. It also should enable using
* the routines for other purposes.
*)
png_row_info = record
width : png_uint_32; (* width of row *)
rowbytes : png_uint_32; (* 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;
ppng_row_info = ^png_row_info;
pppng_row_info = ^ppng_row_info;
png_row_info_struct = png_row_info;
png_row_infop = Ppng_row_info;
png_row_infopp = PPpng_row_info;
png_structp = ^png_struct;
(* These are the function types for the I/O functions and for the functions
* that allow the user to override the default I/O functions with his or her
* own. The png_error_ptr type should match that of user-supplied warning
* and error functions, while the png_rw_ptr type should match that of the
* user read/write data functions.
*)
png_error_ptr = procedure(Arg1 : png_structp; Arg2 : png_const_charp);cdecl;
png_rw_ptr = procedure(Arg1 : png_structp; Arg2 : png_bytep; Arg3 : png_size_t);cdecl;
png_flush_ptr = procedure (Arg1 : png_structp) ;cdecl;
png_read_status_ptr = procedure (Arg1 : png_structp; Arg2 : png_uint_32; Arg3: integer);cdecl;
png_write_status_ptr = procedure (Arg1 : png_structp; Arg2:png_uint_32;Arg3 : integer) ;cdecl;
png_progressive_info_ptr = procedure (Arg1 : png_structp; Arg2 : png_infop) ;cdecl;
png_progressive_end_ptr = procedure (Arg1 : png_structp; Arg2 : png_infop) ;cdecl;
png_progressive_row_ptr = procedure (Arg1 : png_structp; Arg2 : png_bytep; Arg3 : png_uint_32; Arg4 : integer) ;cdecl;
png_user_transform_ptr = procedure (Arg1 : png_structp; Arg2 : png_row_infop; Arg3 : png_bytep) ;cdecl;
png_user_chunk_ptr = function (Arg1 : png_structp; Arg2 : png_unknown_chunkp): integer;cdecl;
png_unknown_chunk_ptr = procedure (Arg1 : png_structp);cdecl;
png_malloc_ptr = function (Arg1 : png_structp; Arg2 : png_size_t) : png_voidp ;cdecl;
png_free_ptr = procedure (Arg1 : png_structp; Arg2 : png_voidp) ; cdecl;
png_struct_def = record
{$ifdef UsePngStruct}
jmpbuf : jmp_buf; (* used in png_error *)
error_fn : png_error_ptr; (* function for printing errors and aborting *)
warning_fn : png_error_ptr; (* function for printing warnings *)
error_ptr : png_voidp; (* user supplied struct for error functions *)
write_data_fn : png_rw_ptr; (* function for writing output data *)
read_data_fn : png_rw_ptr; (* function for reading input data *)
io_ptr : png_voidp; (* ptr to application struct for I/O functions *)
read_user_transform_fn : png_user_transform_ptr; (* user read transform *)
write_user_transform_fn : png_user_transform_ptr; (* user write transform *)
(* These were added in libpng-1.0.2 *)
user_transform_ptr : png_voidp; (* user supplied struct for user transform *)
user_transform_depth : png_byte; (* bit depth of user transformed pixels *)
user_transform_channels : png_byte; (* channels in user transformed pixels *)
mode : png_uint_32; (* tells us where we are in the PNG file *)
flags : png_uint_32; (* flags indicating various things to libpng *)
transformations : png_uint_32; (* which transformations to perform *)
zstream : z_stream; (* pointer to decompression structure (below) *)
zbuf : png_bytep; (* buffer for zlib *)
zbuf_size : png_size_t; (* size of zbuf *)
zlib_level : integer; (* holds zlib compression level *)
zlib_method : integer; (* holds zlib compression method *)
zlib_window_bits : integer; (* holds zlib compression window bits *)
zlib_mem_level : integer; (* holds zlib compression memory level *)
zlib_strategy : integer; (* holds zlib compression strategy *)
width : png_uint_32; (* width of image in pixels *)
height : png_uint_32; (* height of image in pixels *)
num_rows : png_uint_32; (* number of rows in current pass *)
usr_width : png_uint_32; (* width of row at start of write *)
rowbytes : png_uint_32; (* size of row in bytes *)
irowbytes : png_uint_32; (* size of current interlaced row in bytes *)
iwidth : png_uint_32; (* width of current interlaced row in pixels *)
row_number : png_uint_32; (* current row in interlace pass *)
prev_row : png_bytep; (* buffer to save previous (unfiltered) row *)
row_buf : png_bytep; (* buffer to save current (unfiltered) row *)
sub_row : png_bytep; (* buffer to save "sub" row when filtering *)
up_row : png_bytep; (* buffer to save "up" row when filtering *)
avg_row : png_bytep; (* buffer to save "avg" row when filtering *)
paeth_row : png_bytep; (* buffer to save "Paeth" row when filtering *)
row_info : png_row_info; (* used for transformation routines *)
idat_size : png_uint_32; (* current IDAT size for read *)
crc : png_uint_32; (* current chunk CRC value *)
palette : png_colorp; (* palette from the input file *)
num_palette : png_uint_16; (* number of color entries in palette *)
num_trans : png_uint_16; (* number of transparency values *)
chunk_name : array[0..4] of png_byte; (* null-terminated name of current chunk *)
compression : png_byte; (* file compression type (always 0) *)
filter : png_byte; (* file filter type (always 0) *)
interlaced : png_byte; (* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 *)
pass : png_byte; (* current interlace pass (0 - 6) *)
do_filter : png_byte; (* row filter flags (see PNG_FILTER_ below ) *)
color_type : png_byte; (* color type of file *)
bit_depth : png_byte; (* bit depth of file *)
usr_bit_depth : png_byte; (* bit depth of users row *)
pixel_depth : png_byte; (* number of bits per pixel *)
channels : png_byte; (* number of channels in file *)
usr_channels : png_byte; (* channels at start of write *)
sig_bytes : png_byte; (* magic bytes read/written from start of file *)
filler : png_uint_16;
background_gamma_type : png_byte;
background_gamma : single;
background : png_color_16;
background_1 : png_color_16;
output_flush_fn : png_flush_ptr;
flush_dist : png_uint_32;
flush_rows : png_uint_32;
gamma_shift : integer;
gamma : single;
screen_gamma : single;
gamma_table : png_bytep;
gamma_from_1 : png_bytep;
gamma_to_1 : png_bytep;
gamma_16_table : png_uint_16pp;
gamma_16_from_1 : png_uint_16pp;
gamma_16_to_1 : png_uint_16pp;
sig_bit : png_color_8;
shift : png_color_8;
trans : png_bytep;
trans_values : png_color_16;
read_row_fn : png_read_status_ptr;
write_row_fn : png_write_status_ptr;
info_fn : png_progressive_info_ptr;
row_fn : png_progressive_row_ptr;
end_fn : png_progressive_end_ptr;
save_buffer_ptr : png_bytep;
save_buffer : png_bytep;
current_buffer_ptr : png_bytep;
current_buffer : png_bytep;
push_length : png_uint_32;
skip_length : png_uint_32;
save_buffer_size : png_size_t;
save_buffer_max : png_size_t;
buffer_size : png_size_t;
current_buffer_size : png_size_t;
process_mode : integer;
cur_palette : integer;
current_text_size : png_size_t;
current_text_left : png_size_t;
current_text : png_charp;
current_text_ptr : png_charp;
palette_lookup : png_bytep;
dither_index : png_bytep;
hist : png_uint_16p;
heuristic_method : png_byte;
num_prev_filters : png_byte;
prev_filters : png_bytep;
filter_weights : png_uint_16p;
inv_filter_weights : png_uint_16p;
filter_costs : png_uint_16p;
inv_filter_costs : png_uint_16p;
time_buffer : png_charp;
free_me : png_uint_32;
user_chunk_ptr : png_voidp;
read_user_chunk_fn : png_user_chunk_ptr;
num_chunk_list : integer;
chunk_list : png_bytep;
rgb_to_gray_status : png_byte;
rgb_to_gray_red_coeff : png_uint_16;
rgb_to_gray_green_coeff : png_uint_16;
rgb_to_gray_blue_coeff : png_uint_16;
empty_plte_permitted : png_byte;
int_gamma : png_fixed_point;
{$endif UsePngStruct}
end;
ppng_struct_def = ^png_struct_def;
pppng_struct_def = ^ppng_struct_def;
png_struct = png_struct_def;
ppng_struct = ^png_struct;
pppng_struct = ^ppng_struct;
version_1_0_8 = png_structp;
png_structpp = PPpng_struct;
function png_access_version_number:png_uint_32;cdecl; external LibPng;
procedure png_set_sig_bytes(png_ptr:png_structp; num_bytes:integer);cdecl; external LibPng;
function png_sig_cmp(sig:png_bytep; start:png_size_t; num_to_check:png_size_t):integer;cdecl; external LibPng;
function png_check_sig(sig:png_bytep; num:integer):integer;cdecl; external LibPng;
(* Allocate and initialize png_ptr struct for reading, and any other memory. *)
function png_create_read_struct(user_png_ver:png_const_charp; error_ptr:png_voidp; error_fn:png_error_ptr; warn_fn:png_error_ptr):png_structp;cdecl; external LibPng;
(* Allocate and initialize png_ptr struct for writing, and any other memory *)
function png_create_write_struct(user_png_ver:png_const_charp; error_ptr:png_voidp; error_fn:png_error_ptr; warn_fn:png_error_ptr):png_structp;cdecl; external LibPng;
function png_get_compression_buffer_size(png_ptr:png_structp):png_uint_32;cdecl; external LibPng;
procedure png_set_compression_buffer_size(png_ptr:png_structp; size:png_uint_32);cdecl; external LibPng;
function png_reset_zstream(png_ptr:png_structp):integer;cdecl; external LibPng;
procedure png_write_chunk(png_ptr:png_structp; chunk_name:png_bytep; data:png_bytep; length:png_size_t);cdecl; external LibPng;
procedure png_write_chunk_start(png_ptr:png_structp; chunk_name:png_bytep; length:png_uint_32);cdecl; external LibPng;
procedure png_write_chunk_data(png_ptr:png_structp; data:png_bytep; length:png_size_t);cdecl; external LibPng;
procedure png_write_chunk_end(png_ptr:png_structp);cdecl; external LibPng;
(* Allocate and initialize the info structure *)
function png_create_info_struct(png_ptr:png_structp):png_infop;cdecl; external LibPng;
(* Initialize the info structure (old interface - DEPRECATED) *)
procedure png_info_init(info_ptr:png_infop);cdecl; external LibPng;
(* Writes all the PNG information before the image. *)
procedure png_write_info_before_PLTE(png_ptr:png_structp; info_ptr:png_infop);cdecl; external LibPng;
procedure png_write_info(png_ptr:png_structp; info_ptr:png_infop);cdecl; external LibPng;
(* read the information before the actual image data. *)
procedure png_read_info(png_ptr:png_structp; info_ptr:png_infop);cdecl; external LibPng;
function png_convert_to_rfc1123(png_ptr:png_structp; ptime:png_timep):png_charp;cdecl; external LibPng;
procedure png_convert_from_struct_tm(ptime:png_timep; ttime:Pointer);cdecl; external LibPng;
{$IFDEF UNIX}
procedure png_convert_from_time_t(ptime:png_timep; ttime:time_t);cdecl; external LibPng;
{$ENDIF}
procedure png_set_expand(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_gray_1_2_4_to_8(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_palette_to_rgb(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_tRNS_to_alpha(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_bgr(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_gray_to_rgb(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_rgb_to_gray(png_ptr:png_structp; error_action:integer; red:double; green:double);cdecl; external LibPng;
procedure png_set_rgb_to_gray_fixed(png_ptr:png_structp; error_action:integer; red:png_fixed_point; green:png_fixed_point);cdecl; external LibPng;
function png_get_rgb_to_gray_status(png_ptr:png_structp):png_byte;cdecl; external LibPng;
procedure png_build_grayscale_palette(bit_depth:integer; palette:png_colorp);cdecl; external LibPng;
procedure png_set_strip_alpha(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_swap_alpha(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_invert_alpha(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_filler(png_ptr:png_structp; filler:png_uint_32; flags:integer);cdecl; external LibPng;
procedure png_set_swap(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_packing(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_packswap(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_shift(png_ptr:png_structp; true_bits:png_color_8p);cdecl; external LibPng;
function png_set_interlace_handling(png_ptr:png_structp):integer;cdecl; external LibPng;
procedure png_set_invert_mono(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_background(png_ptr:png_structp; background_color:png_color_16p; background_gamma_code:integer; need_expand:integer; background_gamma:double);cdecl; external LibPng;
procedure png_set_strip_16(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_dither(png_ptr:png_structp; palette:png_colorp; num_palette:integer; maximum_colors:integer; histogram:png_uint_16p;
full_dither:integer);cdecl; external LibPng;
procedure png_set_gamma(png_ptr:png_structp; screen_gamma:double; default_file_gamma:double);cdecl; external LibPng;
procedure png_permit_empty_plte(png_ptr:png_structp; empty_plte_permitted:integer);cdecl; external LibPng;
procedure png_set_flush(png_ptr:png_structp; nrows:integer);cdecl; external LibPng;
procedure png_write_flush(png_ptr:png_structp);cdecl; external LibPng;
procedure png_start_read_image(png_ptr:png_structp);cdecl; external LibPng;
procedure png_read_update_info(png_ptr:png_structp; info_ptr:png_infop);cdecl; external LibPng;
(* read one or more rows of image data. *)
procedure png_read_rows(png_ptr:png_structp; row:png_bytepp; display_row:png_bytepp; num_rows:png_uint_32);cdecl; external LibPng;
(* read a row of data. *)
procedure png_read_row(png_ptr:png_structp; row:png_bytep; display_row:png_bytep);cdecl; external LibPng;
(* read the whole image into memory at once. *)
procedure png_read_image(png_ptr:png_structp; image:png_bytepp);cdecl; external LibPng;
(* write a row of image data *)
procedure png_write_row(png_ptr:png_structp; row:png_bytep);cdecl; external LibPng;
(* write a few rows of image data *)
procedure png_write_rows(png_ptr:png_structp; row:png_bytepp; num_rows:png_uint_32);cdecl; external LibPng;
(* write the image data *)
procedure png_write_image(png_ptr:png_structp; image:png_bytepp);cdecl; external LibPng;
(* writes the end of the PNG file. *)
procedure png_write_end(png_ptr:png_structp; info_ptr:png_infop);cdecl; external LibPng;
(* read the end of the PNG file. *)
procedure png_read_end(png_ptr:png_structp; info_ptr:png_infop);cdecl; external LibPng;
(* free any memory associated with the png_info_struct *)
procedure png_destroy_info_struct(png_ptr:png_structp; info_ptr_ptr:png_infopp);cdecl; external LibPng;
(* free any memory associated with the png_struct and the png_info_structs *)
procedure png_destroy_read_struct(png_ptr_ptr:png_structpp; info_ptr_ptr:png_infopp; end_info_ptr_ptr:png_infopp);cdecl; external LibPng;
(* free all memory used by the read (old method - NOT DLL EXPORTED) *)
procedure png_read_destroy(png_ptr:png_structp; info_ptr:png_infop; end_info_ptr:png_infop);cdecl; external LibPng;
(* free any memory associated with the png_struct and the png_info_structs *)
procedure png_destroy_write_struct(png_ptr_ptr:png_structpp; info_ptr_ptr:png_infopp);cdecl; external LibPng;
procedure png_write_destroy_info(info_ptr:png_infop);cdecl; external LibPng;
procedure png_write_destroy(png_ptr:png_structp);cdecl; external LibPng;
procedure png_set_crc_action(png_ptr:png_structp; crit_action:integer; ancil_action:integer);cdecl; external LibPng;
procedure png_set_filter(png_ptr:png_structp; method:integer; filters:integer);cdecl; external LibPng;
procedure png_set_filter_heuristics(png_ptr:png_structp; heuristic_method:integer; num_weights:integer; filter_weights:png_doublep; filter_costs:png_doublep);cdecl; external LibPng;
procedure png_set_compression_level(png_ptr:png_structp; level:integer);cdecl; external LibPng;
procedure png_set_compression_mem_level(png_ptr:png_structp; mem_level:integer);cdecl; external LibPng;
procedure png_set_compression_strategy(png_ptr:png_structp; strategy:integer);cdecl; external LibPng;
procedure png_set_compression_window_bits(png_ptr:png_structp; window_bits:integer);cdecl; external LibPng;
procedure png_set_compression_method(png_ptr:png_structp; method:integer);cdecl; external LibPng;
procedure png_init_io(png_ptr:png_structp; fp:png_FILE_p);cdecl; external LibPng;
(* Replace the (error and abort), and warning functions with user
* supplied functions. If no messages are to be printed you must still
* write and use replacement functions. The replacement error_fn should
* still do a longjmp to the last setjmp location if you are using this
* method of error handling. If error_fn or warning_fn is NULL, the
* default function will be used.
*)
procedure png_set_error_fn(png_ptr:png_structp; error_ptr:png_voidp; error_fn:png_error_ptr; warning_fn:png_error_ptr);cdecl; external LibPng;
(* Return the user pointer associated with the error functions *)
function png_get_error_ptr(png_ptr:png_structp):png_voidp;cdecl; external LibPng;
(* Replace the default data output functions with a user supplied one(s).
* If buffered output is not used, then output_flush_fn can be set to NULL.
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
* output_flush_fn will be ignored (and thus can be NULL).
*)
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);cdecl; external LibPng;
(* Replace the default data input function with a user supplied one. *)
procedure png_set_read_fn(png_ptr:png_structp; io_ptr:png_voidp; read_data_fn:png_rw_ptr);cdecl; external LibPng;
(* Return the user pointer associated with the I/O functions *)
function png_get_io_ptr(png_ptr:png_structp):png_voidp;cdecl; external LibPng;
procedure png_set_read_status_fn(png_ptr:png_structp; read_row_fn:png_read_status_ptr);cdecl; external LibPng;
procedure png_set_write_status_fn(png_ptr:png_structp; write_row_fn:png_write_status_ptr);cdecl; external LibPng;
procedure png_set_read_user_transform_fn(png_ptr:png_structp; read_user_transform_fn:png_user_transform_ptr);cdecl; external LibPng;
procedure png_set_write_user_transform_fn(png_ptr:png_structp; write_user_transform_fn:png_user_transform_ptr);cdecl; external LibPng;
procedure png_set_user_transform_info(png_ptr:png_structp; user_transform_ptr:png_voidp; user_transform_depth:integer; user_transform_channels:integer);cdecl; external LibPng;
function png_get_user_transform_ptr(png_ptr:png_structp):png_voidp;cdecl; external LibPng;
procedure png_set_read_user_chunk_fn(png_ptr:png_structp; user_chunk_ptr:png_voidp; read_user_chunk_fn:png_user_chunk_ptr);cdecl; external LibPng;
function png_get_user_chunk_ptr(png_ptr:png_structp):png_voidp;cdecl; external LibPng;
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);cdecl; external LibPng;
function png_get_progressive_ptr(png_ptr:png_structp):png_voidp;cdecl; external LibPng;
procedure png_process_data(png_ptr:png_structp; info_ptr:png_infop; buffer:png_bytep; buffer_size:png_size_t);cdecl; external LibPng;
procedure png_progressive_combine_row(png_ptr:png_structp; old_row:png_bytep; new_row:png_bytep);cdecl; external LibPng;
function png_malloc(png_ptr:png_structp; size:png_uint_32):png_voidp;cdecl; external LibPng;
procedure png_free(png_ptr:png_structp; ptr:png_voidp);cdecl; external LibPng;
procedure png_free_data(png_ptr:png_structp; info_ptr:png_infop; free_me:png_uint_32; num:integer);cdecl; external LibPng;
procedure png_data_freer(png_ptr:png_structp; info_ptr:png_infop; freer:integer; mask:png_uint_32);cdecl; external LibPng;
function png_memcpy_check(png_ptr:png_structp; s1:png_voidp; s2:png_voidp; size:png_uint_32):png_voidp;cdecl; external LibPng;
function png_memset_check(png_ptr:png_structp; s1:png_voidp; value:integer; size:png_uint_32):png_voidp;cdecl; external LibPng;
procedure png_error(png_ptr:png_structp; error:png_const_charp);cdecl; external LibPng;
procedure png_chunk_error(png_ptr:png_structp; error:png_const_charp);cdecl; external LibPng;
procedure png_warning(png_ptr:png_structp; message:png_const_charp);cdecl; external LibPng;
procedure png_chunk_warning(png_ptr:png_structp; message:png_const_charp);cdecl; external LibPng;
function png_get_valid(png_ptr:png_structp; info_ptr:png_infop; flag:png_uint_32):png_uint_32;cdecl; external LibPng;
function png_get_rowbytes(png_ptr:png_structp; info_ptr:png_infop):png_uint_32;cdecl; external LibPng;
function png_get_rows(png_ptr:png_structp; info_ptr:png_infop):png_bytepp;cdecl; external LibPng;
procedure png_set_rows(png_ptr:png_structp; info_ptr:png_infop; row_pointers:png_bytepp);cdecl; external LibPng;
function png_get_channels(png_ptr:png_structp; info_ptr:png_infop):png_byte;cdecl; external LibPng;
function png_get_image_width(png_ptr:png_structp; info_ptr:png_infop):png_uint_32;cdecl; external LibPng;
function png_get_image_height(png_ptr:png_structp; info_ptr:png_infop):png_uint_32;cdecl; external LibPng;
function png_get_bit_depth(png_ptr:png_structp; info_ptr:png_infop):png_byte;cdecl; external LibPng;
function png_get_color_type(png_ptr:png_structp; info_ptr:png_infop):png_byte;cdecl; external LibPng;
function png_get_filter_type(png_ptr:png_structp; info_ptr:png_infop):png_byte;cdecl; external LibPng;
function png_get_interlace_type(png_ptr:png_structp; info_ptr:png_infop):png_byte;cdecl; external LibPng;
function png_get_compression_type(png_ptr:png_structp; info_ptr:png_infop):png_byte;cdecl; external LibPng;
function png_get_pixels_per_meter(png_ptr:png_structp; info_ptr:png_infop):png_uint_32;cdecl; external LibPng;
function png_get_x_pixels_per_meter(png_ptr:png_structp; info_ptr:png_infop):png_uint_32;cdecl; external LibPng;
function png_get_y_pixels_per_meter(png_ptr:png_structp; info_ptr:png_infop):png_uint_32;cdecl; external LibPng;
function png_get_pixel_aspect_ratio(png_ptr:png_structp; info_ptr:png_infop):single;cdecl; external LibPng;
function png_get_x_offset_pixels(png_ptr:png_structp; info_ptr:png_infop):png_int_32;cdecl; external LibPng;
function png_get_y_offset_pixels(png_ptr:png_structp; info_ptr:png_infop):png_int_32;cdecl; external LibPng;
function png_get_x_offset_microns(png_ptr:png_structp; info_ptr:png_infop):png_int_32;cdecl; external LibPng;
function png_get_y_offset_microns(png_ptr:png_structp; info_ptr:png_infop):png_int_32;cdecl; external LibPng;
function png_get_signature(png_ptr:png_structp; info_ptr:png_infop):png_bytep;cdecl; external LibPng;
function png_get_bKGD(png_ptr:png_structp; info_ptr:png_infop; background:Ppng_color_16p):png_uint_32;cdecl; external LibPng;
procedure png_set_bKGD(png_ptr:png_structp; info_ptr:png_infop; background:png_color_16p);cdecl; external LibPng;
function png_get_cHRM(png_ptr:png_structp; info_ptr:png_infop; white_x:Pdouble; white_y:Pdouble; red_x:Pdouble;
red_y:Pdouble; green_x:Pdouble; green_y:Pdouble; blue_x:Pdouble; blue_y:Pdouble):png_uint_32;cdecl; external LibPng;
function png_get_cHRM_fixed(png_ptr:png_structp; info_ptr:png_infop; int_white_x:Ppng_fixed_point; int_white_y:Ppng_fixed_point; int_red_x:Ppng_fixed_point;
int_red_y:Ppng_fixed_point; int_green_x:Ppng_fixed_point; int_green_y:Ppng_fixed_point; int_blue_x:Ppng_fixed_point; int_blue_y:Ppng_fixed_point):png_uint_32;cdecl; external LibPng;
procedure png_set_cHRM(png_ptr:png_structp; info_ptr:png_infop; white_x:double; white_y:double; red_x:double;
red_y:double; green_x:double; green_y:double; blue_x:double; blue_y:double);cdecl; external LibPng;
procedure png_set_cHRM_fixed(png_ptr:png_structp; info_ptr:png_infop; int_white_x:png_fixed_point; int_white_y:png_fixed_point; int_red_x:png_fixed_point;
int_red_y:png_fixed_point; int_green_x:png_fixed_point; int_green_y:png_fixed_point; int_blue_x:png_fixed_point; int_blue_y:png_fixed_point);cdecl; external LibPng;
function png_get_gAMA(png_ptr:png_structp; info_ptr:png_infop; file_gamma:Pdouble):png_uint_32;cdecl; external LibPng;
function png_get_gAMA_fixed(png_ptr:png_structp; info_ptr:png_infop; int_file_gamma:Ppng_fixed_point):png_uint_32;cdecl; external LibPng;
procedure png_set_gAMA(png_ptr:png_structp; info_ptr:png_infop; file_gamma:double);cdecl; external LibPng;
procedure png_set_gAMA_fixed(png_ptr:png_structp; info_ptr:png_infop; int_file_gamma:png_fixed_point);cdecl; external LibPng;
function png_get_hIST(png_ptr:png_structp; info_ptr:png_infop; hist:Ppng_uint_16p):png_uint_32;cdecl; external LibPng;
procedure png_set_hIST(png_ptr:png_structp; info_ptr:png_infop; hist:png_uint_16p);cdecl; external LibPng;
function png_get_IHDR(png_ptr:png_structp; info_ptr:png_infop; width:Ppng_uint_32; height:Ppng_uint_32; bit_depth:Pinteger;
color_type:Pinteger; interlace_type:Pinteger; compression_type:Pinteger; filter_type:Pinteger):png_uint_32;cdecl; external LibPng;
procedure png_set_IHDR(png_ptr:png_structp; info_ptr:png_infop; width:png_uint_32; height:png_uint_32; bit_depth:integer;
color_type:integer; interlace_type:integer; compression_type:integer; filter_type:integer);cdecl; external LibPng;
function png_get_oFFs(png_ptr:png_structp; info_ptr:png_infop; offset_x:Ppng_int_32; offset_y:Ppng_int_32; unit_type:Pinteger):png_uint_32;cdecl; external LibPng;
procedure png_set_oFFs(png_ptr:png_structp; info_ptr:png_infop; offset_x:png_int_32; offset_y:png_int_32; unit_type:integer);cdecl; external LibPng;
function png_get_pCAL(png_ptr:png_structp; info_ptr:png_infop; purpose:Ppng_charp; X0:Ppng_int_32; X1:Ppng_int_32;
atype:Pinteger; nparams:Pinteger; units:Ppng_charp; params:Ppng_charpp):png_uint_32;cdecl; external LibPng;
procedure png_set_pCAL(png_ptr:png_structp; info_ptr:png_infop; purpose:png_charp; X0:png_int_32; X1:png_int_32;
atype:integer; nparams:integer; units:png_charp; params:png_charpp);cdecl; external LibPng;
function png_get_pHYs(png_ptr:png_structp; info_ptr:png_infop; res_x:Ppng_uint_32; res_y:Ppng_uint_32; unit_type:Pinteger):png_uint_32;cdecl; external LibPng;
procedure png_set_pHYs(png_ptr:png_structp; info_ptr:png_infop; res_x:png_uint_32; res_y:png_uint_32; unit_type:integer);cdecl; external LibPng;
function png_get_PLTE(png_ptr:png_structp; info_ptr:png_infop; palette:Ppng_colorp; num_palette:Pinteger):png_uint_32;cdecl; external LibPng;
procedure png_set_PLTE(png_ptr:png_structp; info_ptr:png_infop; palette:png_colorp; num_palette:integer);cdecl; external LibPng;
function png_get_sBIT(png_ptr:png_structp; info_ptr:png_infop; sig_bit:Ppng_color_8p):png_uint_32;cdecl; external LibPng;
procedure png_set_sBIT(png_ptr:png_structp; info_ptr:png_infop; sig_bit:png_color_8p);cdecl; external LibPng;
function png_get_sRGB(png_ptr:png_structp; info_ptr:png_infop; intent:Pinteger):png_uint_32;cdecl; external LibPng;
procedure png_set_sRGB(png_ptr:png_structp; info_ptr:png_infop; intent:integer);cdecl; external LibPng;
procedure png_set_sRGB_gAMA_and_cHRM(png_ptr:png_structp; info_ptr:png_infop; intent:integer);cdecl; external LibPng;
function png_get_iCCP(png_ptr:png_structp; info_ptr:png_infop; name:png_charpp; compression_type:Pinteger; profile:png_charpp;
proflen:Ppng_uint_32):png_uint_32;cdecl; external LibPng;
procedure png_set_iCCP(png_ptr:png_structp; info_ptr:png_infop; name:png_charp; compression_type:integer; profile:png_charp;
proflen:png_uint_32);cdecl; external LibPng;
function png_get_sPLT(png_ptr:png_structp; info_ptr:png_infop; entries:png_sPLT_tpp):png_uint_32;cdecl; external LibPng;
procedure png_set_sPLT(png_ptr:png_structp; info_ptr:png_infop; entries:png_sPLT_tp; nentries:integer);cdecl; external LibPng;
(* png_get_text also returns the number of text chunks in *num_text *)
function png_get_text(png_ptr:png_structp; info_ptr:png_infop; text_ptr:Ppng_textp; num_text:Pinteger):png_uint_32;cdecl; external LibPng;
(*
* Note while png_set_text() will accept a structure whose text,
* language, and translated keywords are NULL pointers, the structure
* returned by png_get_text will always contain regular
* zero-terminated C strings. They might be empty strings but
* they will never be NULL pointers.
*)
procedure png_set_text(png_ptr:png_structp; info_ptr:png_infop; text_ptr:png_textp; num_text:integer);cdecl; external LibPng;
function png_get_tIME(png_ptr:png_structp; info_ptr:png_infop; mod_time:Ppng_timep):png_uint_32;cdecl; external LibPng;
procedure png_set_tIME(png_ptr:png_structp; info_ptr:png_infop; mod_time:png_timep);cdecl; external LibPng;
function png_get_tRNS(png_ptr:png_structp; info_ptr:png_infop; trans:Ppng_bytep; num_trans:Pinteger; trans_values:Ppng_color_16p):png_uint_32;cdecl; external LibPng;
procedure png_set_tRNS(png_ptr:png_structp; info_ptr:png_infop; trans:png_bytep; num_trans:integer; trans_values:png_color_16p);cdecl; external LibPng;
function png_get_sCAL(png_ptr:png_structp; info_ptr:png_infop; aunit:Pinteger; width:Pdouble; height:Pdouble):png_uint_32;cdecl; external LibPng;
procedure png_set_sCAL(png_ptr:png_structp; info_ptr:png_infop; aunit:integer; width:double; height:double);cdecl; external LibPng;
procedure png_set_sCAL_s(png_ptr:png_structp; info_ptr:png_infop; aunit:integer; swidth:png_charp; sheight:png_charp);cdecl; external LibPng;
procedure png_set_keep_unknown_chunks(png_ptr:png_structp; keep:integer; chunk_list:png_bytep; num_chunks:integer);cdecl; external LibPng;
procedure png_set_unknown_chunks(png_ptr:png_structp; info_ptr:png_infop; unknowns:png_unknown_chunkp; num_unknowns:integer);cdecl; external LibPng;
procedure png_set_unknown_chunk_location(png_ptr:png_structp; info_ptr:png_infop; chunk:integer; location:integer);cdecl; external LibPng;
function png_get_unknown_chunks(png_ptr:png_structp; info_ptr:png_infop; entries:png_unknown_chunkpp):png_uint_32;cdecl; external LibPng;
procedure png_set_invalid(png_ptr:png_structp; info_ptr:png_infop; mask:integer);cdecl; external LibPng;
procedure png_read_png(png_ptr:png_structp; info_ptr:png_infop; transforms:integer; params:png_voidp);cdecl; external LibPng;
procedure png_write_png(png_ptr:png_structp; info_ptr:png_infop; transforms:integer; params:png_voidp);cdecl; external LibPng;
function png_get_header_ver(png_ptr:png_structp):png_charp;cdecl; external LibPng;
function png_get_header_version(png_ptr:png_structp):png_charp;cdecl; external LibPng;
function png_get_libpng_ver(png_ptr:png_structp):png_charp;cdecl; external LibPng;
implementation
end.
