📄 pngdef.pas
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unit pngdef;
interface
const
PNG_LIBPNG_VER_STRING = '1.0.5';
PNG_LIBPNG_VER = 10005;
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_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_SATURATION = 0;
PNG_sRGB_INTENT_PERCEPTUAL = 1;
PNG_sRGB_INTENT_ABSOLUTE = 2;
PNG_sRGB_INTENT_RELATIVE = 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_version(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_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_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;
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