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GR32_PortableNetworkGraphic.pas
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unit GR32_PortableNetworkGraphic;
(* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1 or LGPL 2.1 with linking exception
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* Alternatively, the contents of this file may be used under the terms of the
* Free Pascal modified version of the GNU Lesser General Public License
* Version 2.1 (the "FPC modified LGPL License"), in which case the provisions
* of this license are applicable instead of those above.
* Please see the file LICENSE.txt for additional information concerning this
* license.
*
* The Original Code is Graphics32
*
* The Initial Developer of the Original Code is
* Christian-W. Budde
*
* Portions created by the Initial Developer are Copyright (C) 2000-2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* ***** END LICENSE BLOCK ***** *)
interface
{$I GR32_PngCompilerSwitches.inc}
uses
Classes, Graphics, SysUtils,
{$IFDEF ZLibEx}ZLibEx, ZLibExApi {$ELSE}zlib {$ENDIF};
type
{$A1}
TColorType = (
ctGrayscale = 0,
ctTrueColor = 2,
ctIndexedColor = 3,
ctGrayscaleAlpha = 4,
ctTrueColorAlpha = 6
);
TFilterMethod = (
fmAdaptiveFilter = 0
);
TAdaptiveFilterMethod = (
afmNone = 0,
afmSub = 1,
afmUp = 2,
afmAverage = 3,
afmPaeth = 4
);
TAvailableAdaptiveFilterMethod = (aafmSub, aafmUp, aafmAverage, aafmPaeth);
TAvailableAdaptiveFilterMethods = set of TAvailableAdaptiveFilterMethod;
TInterlaceMethod = (
imNone = 0,
imAdam7 = 1
);
TRGB24 = packed record
R, G, B: Byte;
end;
PRGB24 = ^TRGB24;
TRGB24Array = array [0..0] of TRGB24;
PRGB24Array = ^TRGB24Array;
TRGB24Word = packed record
R, G, B : Word;
end;
PRGB24Word = ^TRGB24Word;
TRGB32 = packed record
R, G, B, A: Byte;
end;
PRGB32 = ^TRGB32;
TRGB32Word = packed record
R, G, B, A: Word;
end;
PRGB32Word = ^TRGB32Word;
PByteArray = SysUtils.PByteArray;
TByteArray = SysUtils.TByteArray;
TChunkName = array [0..3] of AnsiChar;
EPngError = class(Exception);
{$A4}
TCustomChunk = class(TInterfacedPersistent, IStreamPersist)
protected
FChunkName : TChunkName;
FChunkSize : Cardinal;
function GetChunkName: AnsiString; virtual;
function GetChunkSize: Cardinal; virtual;
procedure AssignTo(Dest: TPersistent); override;
procedure SetChunkName(const Value: AnsiString); virtual;
public
constructor Create; virtual;
procedure LoadFromStream(Stream : TStream); virtual;
procedure SaveToStream(Stream : TStream); virtual;
procedure LoadFromFile(FileName : TFileName); virtual;
procedure SaveToFile(FileName : TFileName); virtual;
property ChunkName: AnsiString read GetChunkName write SetChunkName;
property ChunkSize: Cardinal read GetChunkSize;
end;
TCustomDefinedChunk = class(TCustomChunk)
protected
FFilePosition : Cardinal;
procedure SetChunkName(const Value: AnsiString); override;
procedure AssignTo(Dest: TPersistent); override;
public
constructor Create; override;
procedure LoadFromStream(Stream : TStream); override;
class function GetClassChunkName : TChunkName; virtual; abstract;
published
property FilePosition : Cardinal read FFilePosition;
end;
TCustomDefinedChunkClass = class of TCustomDefinedChunk;
TChunkPngImageHeader = class(TCustomDefinedChunk)
private
FWidth : Integer;
FHeight : Integer;
FBitDepth : Byte;
FColorType : TColorType;
FCompressionMethod : Byte;
FFilterMethod : TFilterMethod;
FInterlaceMethod : TInterlaceMethod;
function GetHasPalette: Boolean;
function GetBytesPerRow: Integer;
function GetPixelByteSize: Integer;
procedure SetCompressionMethod(const Value: Byte);
procedure SetFilterMethod(const Value: TFilterMethod);
protected
procedure AssignTo(Dest: TPersistent); override;
public
constructor Create; override;
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
procedure ResetToDefault; virtual;
property Width: Integer read FWidth write FWidth;
property Height: Integer read FHeight write FHeight;
property BitDepth: Byte read FBitDepth write FBitDepth;
property ColorType: TColorType read FColorType write FColorType;
property CompressionMethod: Byte read FCompressionMethod write SetCompressionMethod;
property FilterMethod: TFilterMethod read FFilterMethod write SetFilterMethod;
property InterlaceMethod: TInterlaceMethod read FInterlaceMethod write FInterlaceMethod;
property HasPalette: Boolean read GetHasPalette;
property BytesPerRow: Integer read GetBytesPerRow;
property PixelByteSize: Integer read GetPixelByteSize;
end;
TCustomDefinedChunkWithHeader = class(TCustomDefinedChunk)
protected
FHeader : TChunkPngImageHeader;
procedure AssignTo(Dest: TPersistent); override;
public
constructor Create(Header: TChunkPngImageHeader); reintroduce; virtual;
procedure HeaderChanged; virtual;
property Header: TChunkPngImageHeader read FHeader;
end;
TCustomDefinedChunkWithHeaderClass = class of TCustomDefinedChunkWithHeader;
TChunkPngImageData = class(TCustomDefinedChunkWithHeader)
private
FData : TMemoryStream;
protected
procedure AssignTo(Dest: TPersistent); override;
public
constructor Create(Header: TChunkPngImageHeader); override;
destructor Destroy; override;
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property Data: TMemoryStream read FData;
end;
TChunkPngPalette = class(TCustomDefinedChunkWithHeader)
private
FPaletteEntries : array of TRGB24;
function GetPaletteEntry(Index: Integer): TRGB24;
function GetCount: Integer;
procedure SetCount(const Value: Integer);
procedure SetPaletteEntry(Index: Integer; const Value: TRGB24);
protected
procedure AssignTo(Dest: TPersistent); override;
procedure PaletteEntriesChanged; virtual;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property PaletteEntry[Index: Integer]: TRGB24 read GetPaletteEntry write SetPaletteEntry; default;
property Count: Integer read GetCount write SetCount;
end;
TChunkPngGamma = class(TCustomDefinedChunkWithHeader)
private
FGamma : Cardinal;
function GetGammaAsSingle: Single;
procedure SetGammaAsSingle(const Value: Single);
protected
procedure AssignTo(Dest: TPersistent); override;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property Gamma: Cardinal read FGamma write FGamma;
property GammaAsSingle: Single read GetGammaAsSingle write SetGammaAsSingle;
end;
TChunkPngStandardColorSpaceRGB = class(TCustomDefinedChunkWithHeader)
private
FRenderingIntent : Byte;
protected
procedure AssignTo(Dest: TPersistent); override;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property RenderingIntent: Byte read FRenderingIntent write FRenderingIntent;
end;
TChunkPngPrimaryChromaticities = class(TCustomDefinedChunkWithHeader)
private
FWhiteX : Integer;
FWhiteY : Integer;
FRedX : Integer;
FRedY : Integer;
FGreenX : Integer;
FGreenY : Integer;
FBlueX : Integer;
FBlueY : Integer;
function GetBlueX: Single;
function GetBlueY: Single;
function GetGreenX: Single;
function GetGreenY: Single;
function GetRedX: Single;
function GetRedY: Single;
function GetWhiteX: Single;
function GetWhiteY: Single;
procedure SetBlueX(const Value: Single);
procedure SetBlueY(const Value: Single);
procedure SetGreenX(const Value: Single);
procedure SetGreenY(const Value: Single);
procedure SetRedX(const Value: Single);
procedure SetRedY(const Value: Single);
procedure SetWhiteX(const Value: Single);
procedure SetWhiteY(const Value: Single);
protected
procedure AssignTo(Dest: TPersistent); override;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property WhiteX: Integer read FWhiteX write FWhiteX;
property WhiteY: Integer read FWhiteY write FWhiteY;
property RedX: Integer read FRedX write FRedX;
property RedY: Integer read FRedY write FRedY;
property GreenX: Integer read FGreenX write FGreenX;
property GreenY: Integer read FGreenY write FGreenY;
property BlueX: Integer read FBlueX write FBlueX;
property BlueY: Integer read FBlueY write FBlueY;
property WhiteXAsSingle: Single read GetWhiteX write SetWhiteX;
property WhiteYAsSingle: Single read GetWhiteY write SetWhiteY;
property RedXAsSingle: Single read GetRedX write SetRedX;
property RedYAsSingle: Single read GetRedY write SetRedY;
property GreenXAsSingle: Single read GetGreenX write SetGreenX;
property GreenYAsSingle: Single read GetGreenY write SetGreenY;
property BlueXAsSingle: Single read GetBlueX write SetBlueX;
property BlueYAsSingle: Single read GetBlueY write SetBlueY;
end;
TChunkPngTime = class(TCustomDefinedChunkWithHeader)
private
FYear : Word;
FMonth : Byte;
FDay : Byte;
FHour : Byte;
FMinute : Byte;
FSecond : Byte;
function GetModifiedDateTime: TDateTime;
procedure SetModifiedDateTime(const Value: TDateTime);
protected
procedure AssignTo(Dest: TPersistent); override;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property Year: Word read FYear write FYear;
property Month: Byte read FMonth write FMonth;
property Day: Byte read FDay write FDay;
property Hour: Byte read FHour write FHour;
property Minute: Byte read FMinute write FMinute;
property Second: Byte read FSecond write FSecond;
property ModifiedDateTime: TDateTime read GetModifiedDateTime write SetModifiedDateTime;
end;
TChunkPngEmbeddedIccProfile = class(TCustomDefinedChunkWithHeader)
private
FProfileName : AnsiString;
FCompressionMethod : Byte;
protected
procedure AssignTo(Dest: TPersistent); override;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property ProfileName: AnsiString read FProfileName write FProfileName;
property CompressionMethod: Byte read FCompressionMethod write FCompressionMethod;
end;
TCustomPngSignificantBits = class(TPersistent)
protected
class function GetChunkSize: Integer; virtual; abstract;
public
procedure LoadFromStream(Stream: TStream); virtual; abstract;
procedure SaveToStream(Stream: TStream); virtual; abstract;
property ChunkSize: Integer read GetChunkSize;
end;
TPngSignificantBitsFormat0 = class(TCustomPngSignificantBits)
private
FGrayBits : Byte;
protected
class function GetChunkSize: Integer; override;
procedure AssignTo(Dest: TPersistent); override;
public
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property GrayBits: Byte read FGrayBits write FGrayBits;
end;
TPngSignificantBitsFormat23 = class(TCustomPngSignificantBits)
private
FRedBits : Byte;
FBlueBits : Byte;
FGreenBits : Byte;
protected
class function GetChunkSize: Integer; override;
procedure AssignTo(Dest: TPersistent); override;
public
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property RedBits: Byte read FRedBits write FRedBits;
property BlueBits: Byte read FBlueBits write FBlueBits;
property GreenBits: Byte read FGreenBits write FGreenBits;
end;
TPngSignificantBitsFormat4 = class(TCustomPngSignificantBits)
private
FGrayBits : Byte;
FAlphaBits : Byte;
protected
class function GetChunkSize: Integer; override;
procedure AssignTo(Dest: TPersistent); override;
public
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property GrayBits: Byte read FGrayBits write FGrayBits;
property AlphaBits: Byte read FAlphaBits write FAlphaBits;
end;
TPngSignificantBitsFormat6 = class(TCustomPngSignificantBits)
private
FRedBits : Byte;
FBlueBits : Byte;
FGreenBits : Byte;
FAlphaBits : Byte;
protected
class function GetChunkSize: Integer; override;
procedure AssignTo(Dest: TPersistent); override;
public
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property RedBits: Byte read FRedBits write FRedBits;
property BlueBits: Byte read FBlueBits write FBlueBits;
property GreenBits: Byte read FGreenBits write FGreenBits;
property AlphaBits: Byte read FAlphaBits write FAlphaBits;
end;
TChunkPngSignificantBits = class(TCustomDefinedChunkWithHeader)
private
FSignificantBits : TCustomPngSignificantBits;
protected
procedure AssignTo(Dest: TPersistent); override;
public
constructor Create(Header: TChunkPngImageHeader); override;
destructor Destroy; override;
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
procedure HeaderChanged; override;
property SignificantBits: TCustomPngSignificantBits read FSignificantBits;
end;
TCustomPngBackgroundColor = class(TPersistent)
protected
class function GetChunkSize: Integer; virtual; abstract;
public
procedure LoadFromStream(Stream: TStream); virtual; abstract;
procedure SaveToStream(Stream: TStream); virtual; abstract;
property ChunkSize: Integer read GetChunkSize;
end;
TPngBackgroundColorFormat04 = class(TCustomPngBackgroundColor)
private
FGraySampleValue : Word;
protected
class function GetChunkSize: Integer; override;
procedure AssignTo(Dest: TPersistent); override;
public
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property GraySampleValue: Word read FGraySampleValue write FGraySampleValue;
end;
TPngBackgroundColorFormat26 = class(TCustomPngBackgroundColor)
private
FRedSampleValue : Word;
FBlueSampleValue : Word;
FGreenSampleValue : Word;
protected
class function GetChunkSize: Integer; override;
procedure AssignTo(Dest: TPersistent); override;
public
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property RedSampleValue: Word read FRedSampleValue write FRedSampleValue;
property BlueSampleValue: Word read FBlueSampleValue write FBlueSampleValue;
property GreenSampleValue: Word read FGreenSampleValue write FGreenSampleValue;
end;
TPngBackgroundColorFormat3 = class(TCustomPngBackgroundColor)
private
FIndex : Byte;
protected
class function GetChunkSize: Integer; override;
procedure AssignTo(Dest: TPersistent); override;
public
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property PaletteIndex: Byte read FIndex write FIndex;
end;
TChunkPngBackgroundColor = class(TCustomDefinedChunkWithHeader)
private
FBackground : TCustomPngBackgroundColor;
protected
procedure AssignTo(Dest: TPersistent); override;
public
constructor Create(Header: TChunkPngImageHeader); override;
destructor Destroy; override;
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
procedure HeaderChanged; override;
property Background: TCustomPngBackgroundColor read FBackground;
end;
TChunkPngImageHistogram = class(TCustomDefinedChunkWithHeader)
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
end;
TChunkPngSuggestedPalette = class(TCustomDefinedChunkWithHeader)
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
end;
TCustomPngTransparency = class(TPersistent)
protected
function GetChunkSize: Integer; virtual; abstract;
public
procedure LoadFromStream(Stream: TStream); virtual; abstract;
procedure SaveToStream(Stream: TStream); virtual; abstract;
property ChunkSize: Integer read GetChunkSize;
end;
TPngTransparencyFormat0 = class(TCustomPngTransparency)
private
FGraySampleValue : Word;
protected
procedure AssignTo(Dest: TPersistent); override;
function GetChunkSize: Integer; override;
public
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property GraySampleValue: Word read FGraySampleValue write FGraySampleValue;
end;
TPngTransparencyFormat2 = class(TCustomPngTransparency)
private
FRedSampleValue : Word;
FBlueSampleValue : Word;
FGreenSampleValue : Word;
protected
procedure AssignTo(Dest: TPersistent); override;
function GetChunkSize: Integer; override;
public
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property RedSampleValue: Word read FRedSampleValue write FRedSampleValue;
property BlueSampleValue: Word read FBlueSampleValue write FBlueSampleValue;
property GreenSampleValue: Word read FGreenSampleValue write FGreenSampleValue;
end;
TPngTransparencyFormat3 = class(TCustomPngTransparency)
private
function GetCount: Integer;
function GetTransparency(Index: Integer): Byte;
protected
FTransparency : array of Byte;
procedure AssignTo(Dest: TPersistent); override;
function GetChunkSize: Integer; override;
public
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property Count: Integer read GetCount;
property Transparency[Index: Integer]: Byte read GetTransparency;
end;
TChunkPngTransparency = class(TCustomDefinedChunkWithHeader)
protected
FTransparency : TCustomPngTransparency;
procedure AssignTo(Dest: TPersistent); override;
public
constructor Create(Header: TChunkPngImageHeader); override;
destructor Destroy; override;
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
procedure HeaderChanged; override;
property Transparency: TCustomPngTransparency read FTransparency;
end;
TChunkPngPhysicalPixelDimensions = class(TCustomDefinedChunkWithHeader)
private
FPixelsPerUnitX : Cardinal;
FPixelsPerUnitY : Cardinal;
FUnit : Byte;
protected
procedure AssignTo(Dest: TPersistent); override;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property PixelsPerUnitX: Cardinal read FPixelsPerUnitX write FPixelsPerUnitX;
property PixelsPerUnitY: Cardinal read FPixelsPerUnitY write FPixelsPerUnitY;
property PixelUnit: Byte read FUnit write FUnit;
end;
TChunkPngPhysicalScale = class(TCustomDefinedChunkWithHeader)
private
FUnitSpecifier : Byte;
FUnitsPerPixelX : Single;
FUnitsPerPixelY : Single;
protected
procedure AssignTo(Dest: TPersistent); override;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property UnitSpecifier: Byte read FUnitSpecifier write FUnitSpecifier;
property UnitsPerPixelX: Single read FUnitsPerPixelX write FUnitsPerPixelX;
property UnitsPerPixelY: Single read FUnitsPerPixelY write FUnitsPerPixelY;
end;
TChunkPngImageOffset = class(TCustomDefinedChunkWithHeader)
private
FImagePositionX : Integer;
FImagePositionY : Integer;
FUnitSpecifier : Byte;
protected
procedure AssignTo(Dest: TPersistent); override;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property UnitSpecifier: Byte read FUnitSpecifier write FUnitSpecifier;
property ImagePositionX: Integer read FImagePositionX write FImagePositionX;
property ImagePositionY: Integer read FImagePositionY write FImagePositionY;
end;
TChunkPngPixelCalibrator = class(TCustomDefinedChunkWithHeader)
private
FCalibratorName : AnsiString;
FOriginalZeroes : array [0..1] of Integer;
FEquationType : Byte;
FNumberOfParams : Byte;
FUnitName : AnsiString;
protected
procedure AssignTo(Dest: TPersistent); override;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property CalibratorName: AnsiString read FCalibratorName write FCalibratorName;
property OriginalZeroMin: Integer read FOriginalZeroes[0] write FOriginalZeroes[0];
property OriginalZeroMax: Integer read FOriginalZeroes[1] write FOriginalZeroes[1];
property EquationType: Byte read FEquationType write FEquationType;
property NumberOfParams: Byte read FNumberOfParams write FNumberOfParams;
end;
TCustomDefinedChunkTextChunk = class(TCustomDefinedChunkWithHeader)
protected
FKeyword : AnsiString;
FText : AnsiString;
procedure AssignTo(Dest: TPersistent); override;
public
property Keyword: AnsiString read FKeyword write FKeyword;
property Text: AnsiString read FText write FText;
end;
TChunkPngTextChunk = class(TCustomDefinedChunkTextChunk)
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
end;
TChunkPngCompressedTextChunk = class(TCustomDefinedChunkTextChunk)
private
FCompressionMethod : Byte;
protected
procedure AssignTo(Dest: TPersistent); override;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property CompressionMethod: Byte read FCompressionMethod write FCompressionMethod;
end;
TChunkPngInternationalTextChunk = class(TCustomDefinedChunkTextChunk)
private
FCompressionMethod : Byte;
FCompressionFlag : Byte;
FLanguageString : AnsiString;
FTranslatedKeyword : string;
protected
procedure AssignTo(Dest: TPersistent); override;
public
class function GetClassChunkName: TChunkName; override;
procedure LoadFromStream(Stream: TStream); override;
procedure SaveToStream(Stream: TStream); override;
property CompressionMethod: Byte read FCompressionMethod write FCompressionMethod;
property CompressionFlag: Byte read FCompressionFlag write FCompressionFlag;
property LanguageString: AnsiString read FLanguageString write FLanguageString;
property TranslatedKeyword: string read FTranslatedKeyword write FTranslatedKeyword;
end;
TUnknownChunk = class(TCustomChunk)
private
function GetData(index: Integer): Byte;
procedure SetData(index: Integer; const Value: Byte);
protected
FDataStream : TMemoryStream;
function CalculateChecksum: Integer;
procedure AssignTo(Dest: TPersistent); override;
public
constructor Create; override;
destructor Destroy; override;
procedure LoadFromStream(Stream : TStream); override;
procedure SaveToStream(Stream : TStream); override;
property Data[index : Integer]: Byte read GetData write SetData;
property DataStream: TMemoryStream read FDataStream;
end;
TChunkList = class(TPersistent)
private
FChunks : array of TCustomChunk;
function GetCount: Integer;
protected
function GetChunk(Index: Integer): TCustomChunk;
procedure AssignTo(Dest: TPersistent); override;
public
destructor Destroy; override;
procedure Add(Item: TCustomChunk);
procedure Clear; virtual;
procedure Delete(Index: Integer);
function IndexOf(Item: TCustomChunk): Integer;
procedure Remove(Item: TCustomChunk);
property Count: Integer read GetCount;
property Chunks[Index: Integer]: TCustomChunk read GetChunk; default;
end;
TCustomPngCoder = class
protected
FStream : TStream;
FHeader : TChunkPngImageHeader;
FGamma : TChunkPngGamma;
FPalette : TChunkPngPalette;
FRowBuffer : array [0..1] of PByteArray;
FMappingTable : PByteArray;
procedure BuildMappingTable; virtual;
procedure EncodeFilterSub(CurrentRow, PreviousRow, OutputRow: PByteArray; BytesPerRow, PixelByteSize: Integer);
procedure EncodeFilterUp(CurrentRow, PreviousRow, OutputRow: PByteArray; BytesPerRow, PixelByteSize: Integer);
procedure EncodeFilterAverage(CurrentRow, PreviousRow, OutputRow: PByteArray; BytesPerRow, PixelByteSize: Integer);
procedure EncodeFilterPaeth(CurrentRow, PreviousRow, OutputRow: PByteArray; BytesPerRow, PixelByteSize: Integer);
procedure DecodeFilterSub(CurrentRow, PreviousRow: PByteArray; BytesPerRow, PixelByteSize: Integer);
procedure DecodeFilterUp(CurrentRow, PreviousRow: PByteArray; BytesPerRow, PixelByteSize: Integer);
procedure DecodeFilterAverage(CurrentRow, PreviousRow: PByteArray; BytesPerRow, PixelByteSize: Integer);
procedure DecodeFilterPaeth(CurrentRow, PreviousRow: PByteArray; BytesPerRow, PixelByteSize: Integer);
procedure EncodeFilterRow(CurrentRow, PreviousRow, OutputRow, TempBuffer: PByteArray; BytesPerRow, PixelByteSize: Integer); virtual; abstract;
procedure DecodeFilterRow(FilterMethod: TAdaptiveFilterMethod; CurrentRow, PreviousRow: PByteArray; BytesPerRow, PixelByteSize: Integer); virtual; abstract;
public
constructor Create(Stream: TStream; Header: TChunkPngImageHeader;
Gamma: TChunkPngGamma = nil; Palette: TChunkPngPalette = nil); virtual;
destructor Destroy; override;
end;
TScanLineCallback = function(Bitmap: TObject; Y: Integer): Pointer of object;
TCustomPngDecoder = class(TCustomPngCoder)
protected
procedure EncodeFilterRow(CurrentRow, PreviousRow, OutputRow, TempBuffer: PByteArray; BytesPerRow, PixelByteSize: Integer); override;
procedure DecodeFilterRow(FilterMethod: TAdaptiveFilterMethod; CurrentRow, PreviousRow: PByteArray; BytesPerRow, PixelByteSize: Integer); override;
public
procedure DecodeToScanline(Bitmap: TObject; ScanLineCallback: TScanLineCallback); virtual; abstract;
end;
TCustomPngDecoderClass = class of TCustomPngDecoder;
TCustomPngEncoder = class(TCustomPngCoder)
protected
procedure EncodeFilterRow(CurrentRow, PreviousRow, OutputRow, TempBuffer: PByteArray; BytesPerRow, PixelByteSize: Integer); override;
procedure DecodeFilterRow(FilterMethod: TAdaptiveFilterMethod; CurrentRow, PreviousRow: PByteArray; BytesPerRow, PixelByteSize: Integer); override;
public
procedure EncodeFromScanline(Bitmap: TObject; ScanLineCallback: TScanLineCallback); virtual; abstract;
end;
TCustomPngEncoderClass = class of TCustomPngEncoder;
TCustomPngTranscoder = class(TCustomPngCoder)
protected
procedure EncodeFilterRow(CurrentRow, PreviousRow, OutputRow, TempBuffer: PByteArray; BytesPerRow, PixelByteSize: Integer); override;
procedure DecodeFilterRow(FilterMethod: TAdaptiveFilterMethod; CurrentRow, PreviousRow: PByteArray; BytesPerRow, PixelByteSize: Integer); override;
procedure Transcode; virtual; abstract;
public
constructor Create(Stream: TStream; Header: TChunkPngImageHeader;
Gamma: TChunkPngGamma = nil; Palette: TChunkPngPalette = nil); override;
destructor Destroy; override;
end;
TCustomPngTranscoderClass = class of TCustomPngTranscoder;
TPortableNetworkGraphic = class(TInterfacedPersistent, IStreamPersist)
private
FCompressionLevel : Byte;
FAdaptiveFilterMethods : TAvailableAdaptiveFilterMethods;
function GetBitDepth: Byte;
function GetColorType: TColorType;
function GetCompressionMethod: Byte;
function GetFilterMethod: TFilterMethod;
function GetHeight: Integer;
function GetInterlaceMethod: TInterlaceMethod;
function GetPaletteEntry(index: Integer): TRGB24;
function GetPaletteEntryCount: Integer;
function GetWidth: Integer;
function GetGamma: Single;
function GetModifiedTime: TDateTime;
function GetPixelsPerUnitX: Cardinal;
function GetPixelsPerUnitY: Cardinal;
function GetPixelUnit: Byte;
procedure SetPixelsPerUnitX(const Value: Cardinal);
procedure SetPixelsPerUnitY(const Value: Cardinal);
procedure SetPixelUnit(const Value: Byte);
procedure SetBitDepth(const Value: Byte);
procedure SetChromaChunk(const Value: TChunkPngPrimaryChromaticities);
procedure SetColorType(const Value: TColorType);
procedure SetCompressionMethod(const Value: Byte);
procedure SetCompressionLevel(const Value: Byte);
procedure SetAdaptiveFilterMethods(const Value: TAvailableAdaptiveFilterMethods);
procedure SetFilterMethod(const Value: TFilterMethod);
procedure SetGamma(const Value: Single);
procedure SetModifiedTime(const Value: TDateTime);
procedure SetHeight(const Value: Integer);
procedure SetImageHeader(const Value: TChunkPngImageHeader);
procedure SetInterlaceMethod(const Value: TInterlaceMethod);
procedure SetGammaChunk(const Value: TChunkPngGamma);
procedure SetPaletteChunk(const Value: TChunkPngPalette);
procedure SetPhysicalDimensions(const Value: TChunkPngPhysicalPixelDimensions);
procedure SetSignificantBits(const Value: TChunkPngSignificantBits);
procedure SetTimeChunk(const Value: TChunkPngTime);
procedure SetWidth(const Value: Integer);
function CalculateCRC(Buffer: PByte; Count: Cardinal): Cardinal; overload;
function CalculateCRC(Stream: TStream): Cardinal; overload;
{$IFDEF CheckCRC}
function CheckCRC(Stream: TStream; CRC: Cardinal): Boolean;
{$ENDIF}
procedure ReadImageDataChunk(Stream: TStream);
procedure ReadUnknownChunk(Stream: TStream);
protected
FImageHeader : TChunkPngImageHeader;
FPaletteChunk : TChunkPngPalette;
FGammaChunk : TChunkPngGamma;
FTimeChunk : TChunkPngTime;
FSignificantBits : TChunkPngSignificantBits;
FPhysicalDimensions : TChunkPngPhysicalPixelDimensions;
FChromaChunk : TChunkPngPrimaryChromaticities;
FDataChunkList : TChunkList;
FAdditionalChunkList : TChunkList;
procedure Clear; virtual;
procedure AssignTo(Dest: TPersistent); override;
procedure CopyImageData(Stream: TStream);
procedure StoreImageData(Stream: TStream);
procedure DecompressImageDataToStream(Stream: TStream);
procedure CompressImageDataFromStream(Stream: TStream);
procedure CompressionLevelChanged; virtual;
procedure AdaptiveFilterMethodsChanged; virtual;
procedure InterlaceMethodChanged; virtual;
property ImageHeader: TChunkPngImageHeader read FImageHeader write SetImageHeader;
property PaletteChunk: TChunkPngPalette read FPaletteChunk write SetPaletteChunk;
property GammaChunk: TChunkPngGamma read FGammaChunk write SetGammaChunk;
property TimeChunk: TChunkPngTime read FTimeChunk write SetTimeChunk;
property PhysicalPixelDimensionsChunk: TChunkPngPhysicalPixelDimensions read FPhysicalDimensions write SetPhysicalDimensions;
public
constructor Create; virtual;
destructor Destroy; override;
procedure Assign(Source: TPersistent); override;
procedure LoadFromStream(Stream: TStream); virtual;
procedure SaveToStream(Stream: TStream); virtual;
procedure LoadFromFile(Filename: TFilename); virtual;
procedure SaveToFile(Filename: TFilename); virtual;
class function CanLoad(const FileName: TFileName): Boolean; overload;
class function CanLoad(Stream: TStream): Boolean; overload;
function HasPhysicalPixelDimensionsInformation: Boolean;
function HasGammaInformation: Boolean;
function HasModifiedTimeInformation: Boolean;
procedure RemovePhysicalPixelDimensionsInformation;
procedure RemoveGammaInformation;
procedure RemoveModifiedTimeInformation;
property Width: Integer read GetWidth write SetWidth;
property Height: Integer read GetHeight write SetHeight;
property BitDepth: Byte read GetBitDepth write SetBitDepth;
property ColorType: TColorType read GetColorType write SetColorType;
property CompressionMethod: Byte read GetCompressionMethod write SetCompressionMethod;
property CompressionLevel: Byte read FCompressionLevel write SetCompressionLevel;
property CompressionFilterMethods: TAvailableAdaptiveFilterMethods read FAdaptiveFilterMethods write SetAdaptiveFilterMethods;
property FilterMethod: TFilterMethod read GetFilterMethod write SetFilterMethod;
property InterlaceMethod: TInterlaceMethod read GetInterlaceMethod write SetInterlaceMethod;
property PaletteEntry[index: Integer]: TRGB24 read GetPaletteEntry;
property PaletteEntryCount: Integer read GetPaletteEntryCount;
property Gamma: Single read GetGamma write SetGamma;
property ModifiedTime: TDateTime read GetModifiedTime write SetModifiedTime;
property PixelsPerUnitX: Cardinal read GetPixelsPerUnitX write SetPixelsPerUnitX;
property PixelsPerUnitY: Cardinal read GetPixelsPerUnitY write SetPixelsPerUnitY;
property PixelUnit: Byte read GetPixelUnit write SetPixelUnit;
property SignificantBitsChunk: TChunkPngSignificantBits read FSignificantBits write SetSignificantBits;
property PrimaryChromaticitiesChunk: TChunkPngPrimaryChromaticities read FChromaChunk write SetChromaChunk;
end;
procedure RegisterPngChunk(ChunkClass: TCustomDefinedChunkWithHeaderClass);
procedure RegisterPngChunks(ChunkClasses: array of TCustomDefinedChunkWithHeaderClass);
function FindPngChunkByChunkName(ChunkName: TChunkName): TCustomDefinedChunkWithHeaderClass;
implementation
uses
Math;
resourcestring
RCStrAncillaryUnknownChunk = 'Unknown chunk is marked as ancillary';
RCStrChunkSizeTooSmall = 'Chunk size too small!';
RCStrDataIncomplete = 'Data not complete';
RCStrDirectCompressionMethodSetError = 'Compression Method may not be specified directly yet!';
RCStrDirectFilterMethodSetError = 'Filter Method may not be specified directly yet!';
RCStrDirectGammaSetError = 'Gamma may not be specified directly yet!';
RCStrDirectHeightSetError = 'Height may not be specified directly yet!';
RCStrDirectInterlaceMethodSetError = 'Interlace Method may not be specified directly yet!';
RCStrDirectWidthSetError = 'Width may not be specified directly yet!';
RCStrEmptyChunkList = 'Chunk list is empty';
RCStrHeaderInvalid = 'The provided header is not valid!';
RCStrIncompletePalette = 'Palette is incomplete';
RCStrIndexOutOfBounds = 'Index out of bounds (%d)';
RCStrNewHeaderError = 'New header may not be nil!';
RCStrNoModifiedTime = 'Modified time not available!';
RCStrNotAValidPNGFile = 'Not a valid PNG file';
RCStrNotYetImplemented = 'Not yet implemented';
RCStrPaletteLimited = 'Palette is limited to 256 entries';
RCStrPaletteMissing = 'Required palette is missing';
RCStrSeveralChromaChunks = 'Primary chromaticities chunk defined twice!';
RCStrSeveralGammaChunks = 'Gamma chunk defined twice!';
RCStrSeveralPaletteChunks = 'Palette chunk defined twice!';
RCStrSeveralPhysicalPixelDimensionChunks = 'Several physical pixel dimenson chunks found';
RCStrSeveralSignificantBitsChunksFound = 'Several significant bits chunks found';
RCStrSeveralTimeChunks = 'Time chunk appears twice!';
RCStrUnknownColorType = 'Unknown color type!';
RCStrUnspecifiedPixelUnit = 'Unspecified unit';
RCStrUnsupportedCompressionMethod = 'Compression method not supported!';
RCStrUnsupportedCompressMethod = 'Unsupported compression method';
RCStrUnsupportedFilter = 'Unsupported Filter';
RCStrUnsupportedFilterMethod = 'Unsupported filter method';
RCStrUnsupportedFormat = 'Unsupported Format';
RCStrUnsupportedInterlaceMethod = 'Unsupported interlace method';
RCStrWrongBitdepth = 'Wrong Bitdepth';
RCStrWrongPixelPerUnit = 'Pixel per unit may not be zero!';
RCStrWrongTransparencyFormat = 'Wrong transparency format';
RCStrInvalidCompressionLevel = 'Invalid compression level';
RCStrBitDepthTranscodingError = 'Bit depth may not be specified directly yet!';
RCStrColorTypeTranscodingError = 'Color Type may not be specified directly yet!';
{$IFDEF CheckCRC}
RCStrCRCError = 'CRC Error';
{$ENDIF}
type
TCrcTable = array [0..255] of Cardinal;
PCrcTable = ^TCrcTable;
var
GCrcTable : PCrcTable;
GPngChunkClasses: array of TCustomDefinedChunkWithHeaderClass;
const
CPngMagic = #$0D#$0A#$1A#$0A;
CRowStart : array[0..6] of Integer = (0, 0, 4, 0, 2, 0, 1);
CColumnStart : array[0..6] of Integer = (0, 4, 0, 2, 0, 1, 0);
CRowIncrement : array[0..6] of Integer = (8, 8, 8, 4, 4, 2, 2);
CColumnIncrement : array[0..6] of Integer = (8, 8, 4, 4, 2, 2, 1);
type
TPngNonInterlacedToAdam7Transcoder = class(TCustomPngTranscoder)
protected