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GraphicEx.pas
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GraphicEx.pas
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unit GraphicEx;
{$IFDEF FPC}
{$MODE Delphi}
{$ENDIF}
// The original code is GraphicEx.pas, released November 1, 1999.
//
// The initial developer of the original code is Mike Lischke (www.soft-gems.net),
//
// Copyright (C) 1999, 2008 Mike Lischke. All Rights Reserved.
//
// Credits:
// Haukur K. Bragason, Ingo Neumann, Craig Peterson
//----------------------------------------------------------------------------------------------------------------------
//
// See help file for a description of supported image formats.
//
// Version II.1.17
//
// Note: This library can be compiled with Delphi 5 or newer versions.
//
//----------------------------------------------------------------------------------------------------------------------
//
// September 2008
// - Bug fix: size computations in component retrieval for SGI images.
// October 2006
// - Bug fix: 16 bpp SGI images loading failed
// August 2005
// - Bug fix: added exceptions for PCX and PCD images in case they cannot be read.
// December 2005
// - Bug fix: The filter string returned for open dialogs was incorrect, which caused missing files in the dialog.
// November 2005
// - Bug fix: correct handling of 256 colors in PPM files.
// October 2005
// - Bug fix: Passing dynamic arrays of zero size to functions using the @ operator fails.
// February 2005
// - Bug fix: Line offset in TIFF did not consider partly used source bytes (BPP 4 and lower).
//
// January 2005:
// - Bug fix: color manager must be used for new TIFF reader.
// - Bug fix: CompBuffer in PSD loader must be set to nil initially.
// - Bug fix: DoStretch working bitmap is not thread safe, needs Canvas.Lock/Unlock.
// - Improvement: New standalone function ReadImageProperties.
//
// See help file for a full development history.
//
//----------------------------------------------------------------------------------------------------------------------
interface
{$I GraphicConfiguration.inc}
{$I Compilers.inc}
uses
{$IFnDEF FPC}
Windows,
{$ELSE}
LCLIntf, LCLType, LMessages,
{$ENDIF}
Classes, ExtCtrls, Graphics, SysUtils, Contnrs,
{$ifdef TIFFGraphic}
TIFF,
{$endif TIFFGraphic}
GraphicCompression, GraphicStrings, GraphicColor;
const
GraphicExVersion = 'II.1.17';
type
TCardinalArray = array of Cardinal;
TByteArray = array of Byte;
TFloatArray = array of Single;
TImageOptions = set of (
ioTiled, // image consists of tiles not strips (TIF)
ioBigEndian, // byte order in values >= words is reversed (TIF, RLA, SGI)
ioMinIsWhite, // minimum value in grayscale palette is white not black (TIF)
ioReversed, // bit order in bytes is reveresed (TIF)
ioUseGamma // gamma correction is used
);
// describes the compression used in the image file
TCompressionType = (
ctUnknown, // Compression type is unknown.
ctNone, // No compression.
ctRLE, // Run length encoding.
ctPackedBits, // Macintosh packed bits.
ctLZW, // Lempel-Zif-Welch.
ctFax3, // CCITT T.4 (1D), also known as fax group 3.
ct2DFax3, // CCITT T.4 (2D).
ctFaxRLE, // Modified Huffman (CCITT T.4 derivative).
ctFax4, // CCITT T.6, also known as fax group 4.
ctFaxRLEW, // CCITT T.4 with word alignment.
ctLZ77, // Hufman inflate/deflate.
ctJPEG, // TIF JPEG compression (new version)
ctOJPEG, // TIF JPEG compression (old version)
ctThunderscan, // TIF thunderscan compression
ctNext,
ctIT8CTPAD,
ctIT8LW,
ctIT8MP,
ctIT8BL,
ctPixarFilm,
ctPixarLog,
ctDCS,
ctJBIG,
ctPCDHuffmann, // PhotoCD Hufman compression
ctPlainZip, // ZIP compression without prediction
ctPredictedZip, // ZIP comression with prediction
ctSGILog, // SGI Log Luminance RLE
ctSGILog24 // SGI Log 24-bit packed
);
// properties of a particular image which are set while loading an image or when
// they are explicitly requested via ReadImageProperties
PImageProperties = ^TImageProperties;
TImageProperties = record
Version: Cardinal; // TIF, PSP, GIF
Options: TImageOptions; // all images
Width, // all images
Height: Integer; // all images
ColorScheme: TColorScheme; // all images
BitsPerSample, // all Images
SamplesPerPixel, // all images
BitsPerPixel: Byte; // all images
Compression: TCompressionType; // all images
FileGamma: Single; // RLA, PNG
XResolution,
YResolution: Single; // given in dpi (TIF, PCX, PSP)
Interlaced, // GIF, PNG
HasAlpha: Boolean; // TIF, PNG
ImageCount: Cardinal; // Number of subimages (PCD, TIF, GIF, MNG).
Comment: string; // Implemented for PNG and GIF.
// Informational data, used internally and/or by decoders
// PCD
Overview: Boolean; // true if image is an overview image
Rotate: Byte; // describes how the image is rotated (aka landscape vs. portrait image)
// GIF
LocalColorTable: Boolean; // image uses an own color palette instead of the global one
// RLA
BottomUp: Boolean; // images is bottom to top
// PNG
FilterMode: Byte;
// TIFF
Orientation: Word;
{$IFDEF OldTiffGraphic}
FirstIFD: Cardinal;
BytesPerLine: Cardinal;
YCbCrSubSampling: TByteArray;
JPEGTables: TByteArray;
Predictor: Integer;
CurrentRow: Cardinal;
CurrentStrip: Integer;
StripCount: Integer;
RowsPerStrip: TCardinalArray;
TileWidth: Cardinal;
TileLength: Cardinal;
JPEGColorMode: Cardinal;
JPEGTablesMode: Cardinal;
PlanarConfig: Cardinal;
JPEGOffset: Cardinal;
JPEGSize: Cardinal;
//the fields below seem to be of no use and obsolete
JPEGProc: Word; //1 for baseline, 14 for lossless
QTables: TCardinalArray;
HuffDCTables: TCardinalArray;
HuffACTables: TCardinalArray;
{$ENDIF}
end;
// This mode is used when creating a file mapping. See TFileMapping.
TFileMappingMode = (
fmmCreateNew, // Always create a new file (overwrite any existing). Implicitely gives read/write access.
fmmOpenOrCreate, // Open if file exists (implicitely gives read/write access) or create if it does not.
fmmReadOnly, // Open existing file read only.
fmmReadWrite // Open existing file with read and write access.
);
// This class is used to provide direct (mapped) memory access to a file.
// It is optimized for use in GraphicEx (sequential access).
TFileMapping = class
private
FFileName: string;
FFileHandle,
FFileMapping: THandle;
FFileSize: Int64;
FMemory: Pointer;
public
constructor Create(const FileName: string; Mode: TFileMappingMode); overload;
constructor Create(Stream: THandleStream); overload;
destructor Destroy; override;
property FileName: string read FFileName;
property Memory: Pointer read FMemory;
property Size: Int64 read FFileSize;
end;
// This is the base class for all image types implemented in GraphicEx.
// It contains some generally used stuff.
TGraphicExGraphic = class(TBitmap)
private
FColorManager: TColorManager;
FImageProperties: TImageProperties;
// Advanced progress display support.
FProgressStack: TStack; // Used to manage nested progress sections.
FProgressRect: TRect;
FPercentDone: Single; // Progress over all parts of the load process.
protected
Decoder: TDecoder; // The decoder used to decompress the image data.
procedure AdvanceProgress(Amount: Single; OffsetX, OffsetY: Integer; DoRedraw: Boolean);
procedure ClearProgressStack;
procedure FinishProgressSection(DoRedraw: Boolean);
procedure InitProgress(Width, Height: Integer);
procedure StartProgressSection(Size: Single; const S: string);
public
constructor Create; override;
destructor Destroy; override;
procedure Assign(Source: TPersistent); override;
class function CanLoad(const FileName: string): Boolean; overload;
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; overload; virtual;
class function CanLoad(Stream: TStream): Boolean; overload;
{$IFDEF COMPILER_25_UP}
class function CanLoadFromStream(Stream: TStream): Boolean; override;
{$ENDIF}
procedure LoadFromFile(const FileName: string); override;
procedure LoadFromFileByIndex(const FileName: string; ImageIndex: Cardinal = 0); virtual; //by default it
//creates file mapping and then calls LoadFromMemory. But if we use TStream instead, we can want to override it...
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); virtual;
procedure LoadFromResourceID(Instance: THandle; ResID: Integer; ImageIndex: Cardinal = 0);
procedure LoadFromResourceName(Instance: THandle; const ResName: string; ImageIndex: Cardinal = 0);
procedure LoadFromStream(Stream: TStream); override;
procedure LoadFromStreamByIndex(Stream: TStream; ImageIndex: Cardinal = 0);
function ReadImageProperties(const Name: string; ImageIndex: Cardinal): Boolean; overload; virtual;
function ReadImageProperties(Stream: TStream; ImageIndex: Cardinal): Boolean; overload; virtual;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; overload; virtual;
property ColorManager: TColorManager read FColorManager;
property ImageProperties: TImageProperties read FImageProperties;
end;
TGraphicExGraphicClass = class of TGraphicExGraphic;
{$ifdef AutodeskGraphic}
// *.cel, *.pic images
TAutodeskGraphic = class(TGraphicExGraphic)
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
end;
{$endif AutodeskGraphic}
{$ifdef SGIGraphic}
// *.bw, *.rgb, *.rgba, *.sgi images
TSGIGraphic = class(TGraphicExGraphic)
private
FRowStart,
FRowSize: TCardinalArray; // Start and compressed length of the lines if the image is compressed.
procedure GetComponents(const Memory: Pointer; var Red, Green, Blue, Alpha: Pointer; Row: Integer);
procedure ReadAndDecode(const Memory: Pointer; Red, Green, Blue, Alpha: Pointer; Row: Integer; BPC: Cardinal);
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
end;
{$endif SGIGraphic}
{$ifdef NewTIFFGraphic}
// *.tif, *.tiff images
TTIFFGraphic = class(TGraphicExGraphic)
private
FMemory: PByte;
FCurrentPointer: PByte;
FSize: Int64;
protected
procedure ReadContiguous(tif: PTIFF);
procedure ReadTiled(tif: PTIFF);
function SetOrientation(tif: PTIFF; H: Cardinal): Cardinal;
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size:Int64; ImageIndex: Cardinal): Boolean; override;
end;
{$endif NewTIFFGraphic}
{$ifdef OldTIFFGraphic}
TIFDEntry = packed record
Tag: Word;
DataType: Word;
DataLength: Cardinal;
Offset: Cardinal;
end;
TTIFFPalette = array[0..787] of Word;
TTIFFGraphic = class(TGraphicExGraphic)
private
FBasePosition: Int64; //won't be too surprised of more than 2 Gb image...
FIFD: array of TIFDEntry; // the tags of one image file directory
FPalette: TTIFFPalette;
FYCbCrPositioning: Cardinal;
FYCbCrCoefficients: TFloatArray;
function FindTag(Tag: Cardinal; var Index: Cardinal): Boolean;
procedure GetValueList(Stream: TStream; Tag: Cardinal; var Values: TByteArray); overload;
procedure GetValueList(Stream: TStream; Tag: Cardinal; var Values: TCardinalArray); overload;
procedure GetValueList(Stream: TStream; Tag: Cardinal; var Values: TFloatArray); overload;
function GetValue(Stream: TStream; Tag: Cardinal; Default: Single = 0): Single; overload;
function GetValue(Tag: Cardinal; Default: Cardinal = 0): Cardinal; overload;
function GetValue(Tag: Cardinal; var Size: Cardinal; Default: Cardinal = 0): Cardinal; overload;
procedure SortIFD;
procedure SwapIFD;
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromStream(Stream: TStream); override; //main code here
procedure LoadFromFileByIndex(const FileName: string; ImageIndex: Cardinal = 0); override; //creates TFileStream
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override; //creates TMemoryStream
procedure SaveToStream(Stream: TStream); override;
function ReadImageProperties(Stream: TStream; ImageIndex: Cardinal): Boolean; override;
end;
{$endif OldTIFFGraphic}
{$ifdef EPSGraphic}
TEPSGraphic = class(TTIFFGraphic)
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
procedure LoadFromStream(Stream: TStream); override;
function ReadImageProperties(Stream: TStream; ImageIndex: Cardinal): Boolean; override;
end;
{$endif EPSGraphic}
{$ifdef TargaGraphic}
// *.tga; *.vst; *.icb; *.vda; *.win images
TTargaGraphic = class(TGraphicExGraphic)
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
procedure SaveToStream(Stream: TStream); overload; override;
procedure SaveToStream(Stream: TStream; Compressed: Boolean); reintroduce; overload;
end;
{$endif TargaGraphic}
{$ifdef PCXGraphic}
// *.pcx; *.pcc; *.scr images
// Note: Due to the badly designed format a PCX/SCR file cannot be part in a larger stream because the position of the
// color palette as well as the decoding size can only be determined by the size of the image.
// Hence the image must be the only one in the stream or the last one.
TPCXGraphic = class(TGraphicExGraphic)
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
end;
{$endif PCXGraphic}
{$ifdef PCDGraphic}
// *.pcd images
// Note: By default the BASE resolution of a PCD image is loaded with LoadFromStream.
TPCDGraphic = class(TGraphicExGraphic)
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 2); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
end;
{$endif PCDGraphic}
{$ifdef PortableMapGraphic}
// *.ppm, *.pgm, *.pbm images
TPPMGraphic = class(TGraphicExGraphic)
private
FSource: PAnsiChar;
FRemainingSize: Int64;
function GetChar: AnsiChar;
function GetNumber: Cardinal;
function ReadLine: AnsiString;
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
end;
{$endif PortableMapGraphic}
{$ifdef CUTGraphic}
// *.cut (+ *.pal) images
// Note: Also this format should not be used in a stream unless it is the only image or the last one!
TCUTGraphic = class(TGraphicExGraphic)
private
FPaletteFile: string;
protected
procedure LoadPalette;
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromFile(const FileName: string); override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
property PaletteFile: string read FPaletteFile write FPaletteFile;
end;
{$endif CUTGraphic}
{$ifdef GIFGraphic}
// *.gif images
TGIFGraphic = class(TGraphicExGraphic)
private
FSource: PByte;
FTransparentIndex: Byte;
function SkipExtensions: Byte;
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
end;
{$endif GIFGraphic}
{$ifdef RLAGraphic}
// *.rla, *.rpf images
// Implementation based on code from Dipl. Ing. Ingo Neumann (ingo@delphingo.com).
TRLAGraphic = class(TGraphicExGraphic)
private
procedure SwapHeader(var Header); // start position of the image header in the stream
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
end;
{$endif RLAGraphic}
{$ifdef PhotoshopGraphic}
// *.psd, *.pdd images
TPSDLayerBlendMode = (
lbmNormal,
lbmDarken,
lbmLighten,
lbmHue,
lbmSaturation,
lbmColor,
lbmLuminosity,
lbmMultiply,
lbmScreen,
lbmDissolve,
lbmOverlay,
lbmHardLight,
lbmSoftLight,
lbmDifference,
lbmExclusion,
lbmColorDodge,
lbmColorBurn
);
TPSDLayerClipping = (
lcBase,
lcNonBase
);
TPSDLayerOptions = set of (
loTransparencyProtected,
loHidden,
loIrrelevantData
);
TPSDLayerType = (
ltBitmap,
ltText,
ltMask
);
// Flags used for mask data in a Photoshop layer.
TPSDLayerMaskFlags = set of (
lmfRelativePosition, // Position of mask is relative to layer.
lmfMaskDisabled, // The layer mask is disabled.
lmfInvertMask // Invert layer mask when blending.
);
TPSDLayerMaskData = record
Bounds: TRect;
DefaultColor: Byte;
Flags: TPSDLayerMaskFlags;
UserMaskBackground: Byte;
end;
// Currently no info is available for data in this block.
TPSDCompositeGrayBlend = record
Black1,
Black2,
White1,
White2: Byte;
end;
// Data specific to one channel in a layer.
// Pixel data is not stored separately for each channel but the layer as a whole.
TPSDChannel = record
ChannelID: SmallInt;
Size: Cardinal; // Size of channel data when loading or storing.
BlendSourceRange,
BlendTargetRange: TPSDCompositeGrayBlend;
Data: Pointer; // Temporary storage for the channel's pixel data.
end;
// Each layer has a collection of channel data.
TPSDChannels = array of TPSDChannel;
// Indirect type declaration here to allow recursive item data structure.
PPSDItemList = ^TPSDItemList;
PPSDDescriptor = ^TPSDDescriptor;
TPSDItemData = record
ItemType: Cardinal; // Type of the item. See ReadDescriptor for a list of possible values.
ClassID: WideString; // Only valid if property or class item.
KeyID: WideString; // Only valid if property or string item.
Name: WideString; // Only valid if name or identifier item.
Units: Integer; // Only valid if Unit float item.
Value: Double; // Only valid if Unit float or double item.
TypeID: WideString; // Only valid if enumeration item.
EnumValue: WideString; // Only valid if enumeration item.
Offset: Cardinal; // Only valid if offset item.
IntValue: Integer; // Only valid if integer item.
BoolValue: Boolean; // Only valid if boolean item.
List: PPSDItemList; // Only valid if (reference) list or item.
DataSize: Cardinal; // Only valid if raw data.
Data: Pointer; // Only valid if raw data.
Descriptor: PPSDDescriptor; // Only valid if the item is again a PSD descriptor.
end;
TPSDItemList = array of TPSDItemData;
// One entry in a PSD descriptor stored as part of e.g. the type tool adjustment layer.
TPSDDescriptorItem = record
Key: string; // Item name.
Data: TPSDItemData; // The value of the item.
end;
TPSDDescriptor = record
ClassID,
ClassID2: WideString;
Items: array of TPSDDescriptorItem;
end;
TDoubleRect = record
Left, Top, Right, Bottom: Double;
end;
TTypeTransform = record
XX, XY, YX, YY, TX, TY: Double;
end;
TPSDTypeToolInfo = record
Transform: TTypeTransform;
TextDescriptor,
WarpDescriptor: TPSDDescriptor;
WarpRectangle: TDoubleRect;
end;
TPSDGraphic = class;
TPhotoshopLayer = class
private
FGraphic: TPSDGraphic;
FBounds: TRect;
FBlendMode: TPSDLayerBlendMode;
FOpacity: Byte; // 0 = transparent ... 255 = opaque
FClipping: TPSDLayerClipping;
FOptions: TPSDLayerOptions;
FMaskData: TPSDLayerMaskData;
FCompositeGrayBlendSource,
FCompositeGrayBlendDestination: TPSDCompositeGrayBlend;
FChannels: TPSDChannels;
FName: WideString;
FImage: TBitmap;
FType: TPSDLayerType;
FTypeToolInfo: TPSDTypeToolInfo; // Only valid if layer is a text layer.
procedure SetImage(const Value: TBitmap);
public
constructor Create(Graphic: TPSDGraphic);
destructor Destroy; override;
property BlendMode: TPSDLayerBlendMode read FBlendMode write FBlendMode;
property Bounds: TRect read FBounds write FBounds;
property Channels: TPSDChannels read FChannels write FChannels;
property Clipping: TPSDLayerClipping read FClipping write FClipping;
property CompositeGrayBlendDestination: TPSDCompositeGrayBlend read FCompositeGrayBlendDestination
write FCompositeGrayBlendDestination;
property CompositeGrayBlendSource: TPSDCompositeGrayBlend read FCompositeGrayBlendSource
write FCompositeGrayBlendSource;
property Image: TBitmap read FImage write SetImage;
property LayerType: TPSDLayerType read FType;
property MaskData: TPSDLayerMaskData read FMaskData write FMaskData;
property Name: WideString read FName write FName;
property Opacity: Byte read FOpacity write FOpacity;
property Options: TPSDLayerOptions read FOptions write FOptions;
end;
TPhotoshopLayers = class(TList)
private
FGraphic: TPSDGraphic;
// The following fields are read from the global layer mask info data but
// their meaning is not well documented or at least obvious from their names.
FOverlayColorSpace: Word; // undocumented
FColorComponents: array[0..3] of Word; // undocumented
FLayerMaskOpacity: Word; // 0 = transparent, 100 = opaque
FKind: Byte; // 0 = Color selected, 1 = Color protected, 128 = use value stored per layer.
// The last one is preferred. The others are for backward compatibility.
protected
function Get(Index: Integer): TPhotoshopLayer;
procedure Notify(Ptr: Pointer; Action: TListNotification); override;
procedure Put(Index: Integer; Layer: TPhotoshopLayer);
public
constructor Create(Graphic: TPSDGraphic);
function Add(Layer: TPhotoshopLayer): Integer;
function AddNewLayer: TPhotoshopLayer;
function Extract(Layer: TPhotoshopLayer): TPhotoshopLayer;
function First: TPhotoshopLayer;
function IndexOf(Layer: TPhotoshopLayer): Integer;
procedure Insert(Index: Integer; Layer: TPhotoshopLayer);
function Last: TPhotoshopLayer;
function Remove(Layer: TPhotoshopLayer): Integer;
property Items[Index: Integer]: TPhotoshopLayer read Get write Put; default;
end;
TPSDGuide = record
Location: Single; // Either X or Y coordinate of the guide depending on IsHorizontal.
IsHorizontal: Boolean; // True if it is a horizontal guide, otherwise False.
end;
TPSDGridSettings = record
HorizontalCycle, // Number of dots per cycle relative to 72 dpi.
VerticalCycle: Single;
Guides: array of TPSDGuide;
end;
TPSDGraphic = class(TGraphicExGraphic)
private
FChannels, // Original channel count of the image (1..24).
FMode: Word; // Original color mode of the image (PSD_*).
FLayers: TPhotoshopLayers;
FGridSettings: TPSDGridSettings;
protected
procedure CombineChannels(Layer: TPhotoshopLayer);
function ConvertCompression(Value: Word): TCompressionType;
function DetermineColorScheme(ChannelCount: Integer): TColorScheme;
procedure LoadAdjustmentLayer(var Run: PAnsiChar; Layer: TPhotoshopLayer);
procedure ReadChannelData(var Run: PAnsiChar; var Channel: TPSDChannel; Width, Height: Integer; IsIrrelevant: Boolean);
procedure ReadDescriptor(var Run: PAnsiChar; var Descriptor: TPSDDescriptor);
procedure ReadMergedImage(var Source: PAnsiChar; Layer: TPhotoshopLayer; Compression: TCompressionType; Channels: Byte);
procedure ReadLayers(Run: PAnsiChar);
procedure ReadResources(Run: PAnsiChar);
function SetupColorManager(Channels: Integer): TPixelFormat;
public
constructor Create; override;
destructor Destroy; override;
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
property GridSettings: TPSDGridSettings read FGridSettings;
property Layers: TPhotoshopLayers read FLayers;
end;
{$endif PhotoshopGraphic}
{$ifdef PaintshopProGraphic}
// *.psp images (file version 3 and 4)
TPSPGraphic = class(TGraphicExGraphic)
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
end;
{$endif PaintshopProGraphic}
{$ifdef PortableNetworkGraphic}
// *.png images
TChunkType = array[0..3] of AnsiChar;
// This header is followed by a variable number of data bytes, which are followed by the CRC for this data.
// The actual size of this data is given by field length in the chunk header.
// CRC is Cardinal (4 byte unsigned integer).
TPNGChunkHeader = packed record
Length: Cardinal; // size of data (entire chunk excluding itself, CRC and type)
ChunkType: TChunkType;
end;
TPNGGraphic = class(TGraphicExGraphic)
private
FIDATSize: Integer; // remaining bytes in the current IDAT chunk
FRawBuffer, // buffer to load raw chunk data and to check CRC
FCurrentSource: Pointer; // points into FRawBuffer for current position of decoding
FHeader: TPNGChunkHeader; // header of the current chunk
FCurrentCRC: Cardinal; // running CRC for the current chunk
FSourceBPP: Integer; // bits per pixel used in the file
FPalette: HPALETTE; // used to hold the palette handle until we can set it finally after the pixel format
// has been set too (as this destroys the current palette)
FTransparency: TByteArray; // If the image is indexed then this array might contain alpha values (depends on file)
// each entry corresponding to the same palette index as the index in this array.
// For grayscale and RGB images FTransparentColor contains the (only) transparent
// color.
FTransparentColor: TColor; // transparent color for gray and RGB
FBackgroundColor: TColor; // index or color ref
procedure ApplyFilter(Filter: Byte; Line, PrevLine, Target: PByte; BPP, BytesPerRow: Integer);
function IsChunk(ChunkType: TChunkType): Boolean;
function LoadAndSwapHeader(var Source: PByte): Cardinal;
procedure LoadBackgroundColor(var Source: PByte; const Description);
procedure LoadIDAT(var Source: PByte; const Description);
procedure LoadText(var Source: PByte);
procedure LoadTransparency(var Source: PByte; const Description);
procedure ReadDataAndCheckCRC(var Source: PByte);
procedure ReadRow(var Source: PByte; RowBuffer: Pointer; BytesPerRow: Integer);
function SetupColorDepth(ColorType, BitDepth: Integer): Integer;
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
property BackgroundColor: TColor read FBackgroundColor;
property Transparency: TByteArray read FTransparency;
end;
{$endif PortableNetworkGraphic}
{$ifdef ArtsAndLettersGraphic}
// *.ged images (Arts & Letters images)
TGEDGraphic = class(TGraphicExGraphic)
public
class function CanLoad(const Memory: Pointer; Size: Int64): Boolean; override;
procedure LoadFromMemory(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal = 0); override;
function ReadImageProperties(const Memory: Pointer; Size: Int64; ImageIndex: Cardinal): Boolean; override;
end;
{$endif ArtsAndLettersGraphic}
// ---------- file format management stuff
TFormatType = (
ftAnimation, // format contains an animation (like GIF or AVI)
ftLayered, // format supports multiple layers (like PSP, PSD)
ftMultiImage, // format can contain more than one image (like TIF or GIF)
ftRaster, // format is contains raster data (this is mainly used)
ftVector, // format contains vector data (like DXF or PSP file version 4)
ftEnableSaving //we can save to this format, not only load
);
TFormatTypes = set of TFormatType;
TFilterSortType = (
fstNone, // do not sort entries, list them as they are registered
fstBoth, // sort entries first by description then by extension
fstDescription, // sort entries by description only
fstExtension // sort entries by extension only
);
TFilterOption = (
foCompact, // use the compact form in filter strings instead listing each extension on a separate line
foIncludeAll, // include the 'All image files' filter string
foIncludeExtension // add the extension to the description
);
TFilterOptions = set of TFilterOption;
// The file format list is an alternative to Delphi's own poor implementation which does neither allow to filter
// graphic formats nor to build common entries in filter strings nor does it care for duplicate entries or
// alphabetic ordering. Additionally, some properties are maintained for each format to do searches, filter particular
// formats for a certain case etc.
TFileFormatList = class
private
FClassList,
FExtensionList: TList;
protected
function FindExtension(const Extension: string): Integer;
function FindGraphicClass(GraphicClass: TGraphicClass): Integer;
public
constructor Create;
destructor Destroy; override;
procedure Clear;
function GetDescription(Graphic: TGraphicClass): string;
procedure GetExtensionList(List: TStrings);
function GetGraphicFilter(Formats: TFormatTypes; SortType: TFilterSortType; Options: TFilterOptions;
GraphicClass: TGraphicClass): string;
function GraphicFromExtension(S: string): TGraphicClass;
function GraphicFromContent(const FileName: string): TGraphicExGraphicClass; overload;
function GraphicFromContent(const Memory: Pointer; Size: Int64): TGraphicExGraphicClass; overload;
function GraphicFromContent(Stream: TStream): TGraphicExGraphicClass; overload;
procedure RegisterFileFormat(const Extension, Common, Individual: string; FormatTypes: TFormatTypes;
Replace: Boolean; GraphicClass: TGraphicClass);
procedure UnregisterFileFormat(const Extension: string; GraphicClass: TGraphicClass);
end;
// Resampling support types.
TResamplingFilter = (
sfBox,
sfTriangle,
sfHermite,
sfBell,
sfSpline,
sfLanczos3,
sfMitchell
);
procedure GraphicExError(ErrorString: string); overload;
procedure GraphicExError(ErrorString: string; Args: array of const); overload;
// Resampling support routines.
procedure Stretch(NewWidth, NewHeight: Cardinal; Filter: TResamplingFilter; Radius: Single; Source, Target: TBitmap); overload;
procedure Stretch(NewWidth, NewHeight: Cardinal; Filter: TResamplingFilter; Radius: Single; Source: TBitmap); overload;
function ReadImageProperties(const FileName: string; var Properties: TImageProperties): Boolean;
// Automatic save to selected extension
procedure SaveGraphicToFile(source: TGraphic; FileName: string);
function ReadBigEndianWord(var Run: PAnsiChar): Word;
var
FileFormatList: TFileFormatList;
//----------------------------------------------------------------------------------------------------------------------
implementation
uses
{$IFnDEF FPC}
Consts,
{$ELSE}
IntfGraphics,
{$ENDIF}
Math, MZLib,
{$IFDEF UseAnsiStringsUnit}AnsiStrings, System.Types,{$ENDIF}
JPEG, JpegCompression;
//we need System.Types because it allows to inline some functions and that'll
//speed-up execution a little. And no warnings.
//these functions are here, because in most recent Delphi versions they are gonna
//move from SysUtils to AnsiStrings. When they are already called deprecated but
//still not moved, ambiguos overload error occurs, that's one of simplest ways to
//fix it and 'shut the compiler up' with its warnings.
function MyStrLComp(const Str1, Str2: PAnsiChar; MaxLen: Cardinal): Integer;
begin
{$IFDEF UseAnsiStringsUnit}
Result := AnsiStrings.StrLComp(Str1, Str2, MaxLen);
{$ELSE}
Result := SysUtils.StrLComp(Str1, Str2, MaxLen);
{$ENDIF}
end;
function MyStrLiComp(const Str1, Str2: PAnsiChar; MaxLen: Cardinal): Integer;
begin
{$IFDEF UseAnsiStringsUnit}
Result := AnsiStrings.StrLIComp(Str1, Str2, MaxLen);
{$ELSE}
Result := SysUtils.StrLIComp(Str1, Str2, MaxLen);
{$ENDIF}
end;
function MyStrLCopy(Dest: PAnsiChar; const Source: PAnsiChar; MaxLen: Cardinal): PAnsiChar;
begin
{$IFDEF UseAnsiStringsUnit}
Result := AnsiStrings.StrLCopy(Dest, Source, MaxLen);
{$ELSE}
Result := SysUtils.StrLCopy(Dest, Source, MaxLen);
{$ENDIF}
end;
type
{$ifndef COMPILER_6_UP}
PCardinal = ^Cardinal;
{$endif COMPILER_6_UP}
// resampling support types
TRGBInt = record
R, G, B: Integer;
end;
TRGBAInt = record
R, G, B, A: Integer;
end;
PRGBWord = ^TRGBWord;
TRGBWord = record
R, G, B: Word;
end;
PRGBAWord = ^TRGBAWord;
TRGBAWord = record
R, G, B, A: Word;
end;
PBGR = ^TBGR;
TBGR = packed record
B, G, R: Byte;
end;
PBGRA = ^TBGRA;
TBGRA = packed record
B, G, R, A: Byte;
end;
PRGB = ^TRGB;
TRGB = packed record
R, G, B: Byte;
end;
PRGBA = ^TRGBA;
TRGBA = packed record
R, G, B, A: Byte;
end;
PPixelArray = ^TPixelArray;
TPixelArray = array[0..0] of TBGR;
TFilterFunction = function(Value: Single): Single;
// contributor for a Pixel
PContributor = ^TContributor;
TContributor = record
Weight: Integer; // Pixel Weight
Pixel: Integer; // Source Pixel
end;
TContributors = array of TContributor;
// list of source pixels contributing to a destination pixel
TContributorEntry = record
N: Integer;
Contributors: TContributors;
end;
TContributorList = array of TContributorEntry;
// An entry of the progress stack for nested progress sections.
PProgressSection = ^TProgressSection;
TProgressSection = record
Position, // Current position in percent.
ParentSize, // Size of this section in the context of the parent section (in %).
TransformFactor: Single; // Accumulated factor to transform a step in this section to an overall value.
Message: string; // Message to display for this section.
end;
const
DefaultFilterRadius: array[TResamplingFilter] of Single = (0.5, 1, 1, 1.5, 2, 3, 2);
threadvar // globally used cache for current image (speeds up resampling about 10%)
CurrentLineR: array of Integer;
CurrentLineG: array of Integer;
CurrentLineB: array of Integer;
CurrentLineA: array of Integer;
//----------------------------------------------------------------------------------------------------------------------
{$ifndef COMPILER_6_UP}
procedure RaiseLastOSError;
begin
RaiseLastWin32Error;
end;
{$endif}
//----------------------------------------------------------------------------------------------------------------------
procedure GraphicExError(ErrorString: string); overload;
begin
raise EInvalidGraphic.Create(ErrorString);
end;
//----------------------------------------------------------------------------------------------------------------------
procedure GraphicExError(ErrorString: string; Args: array of const); overload;
begin
raise EInvalidGraphic.CreateFmt(ErrorString, Args);
end;
//----------------------------------------------------------------------------------------------------------------------
procedure Upsample(Width, Height, ScaledWidth: Cardinal; Pixels: PAnsiChar);
// Creates a new image that is a integral size greater than an existing one.
var
X, Y: Cardinal;
P, Q, R: PAnsiChar;
begin
for Y := 0 to Height - 1 do
begin
P := Pixels + (Height - 1 - Y) * ScaledWidth + (Width - 1);
Q := Pixels + ((Height - 1 - Y) shl 1) * ScaledWidth + ((Width - 1) shl 1);
Q^ := P^;