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{
This file is part of the Free Pascal run time library.
Copyright (c) 2012 by the Free Pascal development team
Common stuff for Tiff image format.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************
}
unit FPTiffCmn;
{$mode objfpc}{$H+}
interface
uses
Classes, sysutils, FPimage;
type
TTiffRational = packed record
Numerator, Denominator: DWord;
end;
const
TiffHandlerName = 'Tagged Image File Format';
TiffRational0: TTiffRational = (Numerator: 0; Denominator: 0);
TiffRational72: TTiffRational = (Numerator: 72; Denominator: 1);
// TFPCustomImage.Extra properties used by TFPReaderTiff and TFPWriterTiff
TiffExtraPrefix = 'Tiff';
TiffPhotoMetric = TiffExtraPrefix+'PhotoMetricInterpretation';
TiffGrayBits = TiffExtraPrefix+'GrayBits'; // CMYK: key plate
TiffRedBits = TiffExtraPrefix+'RedBits'; // CMYK: cyan
TiffGreenBits = TiffExtraPrefix+'GreenBits'; // CMYK: magenta
TiffBlueBits = TiffExtraPrefix+'BlueBits'; // CMYK: yellow
TiffAlphaBits = TiffExtraPrefix+'AlphaBits';
TiffArtist = TiffExtraPrefix+'Artist';
TiffCopyright = TiffExtraPrefix+'Copyright';
TiffDocumentName = TiffExtraPrefix+'DocumentName';
TiffDateTime = TiffExtraPrefix+'DateTime';
TiffImageDescription = TiffExtraPrefix+'ImageDescription';
TiffHostComputer = TiffExtraPrefix+'HostComputer';
TiffMake_ScannerManufacturer = TiffExtraPrefix+'Make_ScannerManufacturer';
TiffModel_Scanner = TiffExtraPrefix+'Model_Scanner';
TiffOrientation = TiffExtraPrefix+'Orientation';
TiffResolutionUnit = TiffExtraPrefix+'ResolutionUnit';
TiffSoftware = TiffExtraPrefix+'Software';
TiffXResolution = TiffExtraPrefix+'XResolution';
TiffYResolution = TiffExtraPrefix+'YResolution';
TiffPageNumber = TiffExtraPrefix+'PageNumber'; // starting at 0
TiffPageCount = TiffExtraPrefix+'PageCount'; // if >0 the image is a page
TiffPageName = TiffExtraPrefix+'PageName';
TiffIsThumbnail = TiffExtraPrefix+'IsThumbnail';
TiffIsMask = TiffExtraPrefix+'IsMask';
TiffTileWidth = TiffExtraPrefix+'TileWidth';
TiffTileLength = TiffExtraPrefix+'TileLength';
TiffCompression = TiffExtraPrefix+'Compression'; // number
TiffCompressionNone = 1; { No Compression, but pack data into bytes as tightly as possible,
leaving no unused bits (except at the end of a row). The component
values are stored as an array of type BYTE. Each scan line (row)
is padded to the next BYTE boundary. }
TiffCompressionCCITTRLE = 2; { CCITT Group 3 1-Dimensional Modified Huffman run length encoding. }
TiffCompressionCCITTFAX3 = 3; { CCITT Group 3 fax encoding }
TiffCompressionCCITTFAX4 = 4; { CCITT Group 4 fax encoding }
TiffCompressionLZW = 5; { LZW }
TiffCompressionOldJPEG = 6; { JPEG old style}
TiffCompressionJPEG = 7; { JPEG new style }
TiffCompressionDeflateAdobe = 8; { Deflate Adobe style }
TiffCompressionJBIGBW = 9; { RFC2301 JBIG black/white }
TiffCompressionJBIGCol = 10; { RFC2301 JBIG color }
TiffCompressionNeXT = 32766; { Next }
TiffCompressionCCITTRLEW = 32771; { CCITTRLEW }
TiffCompressionPackBits = 32773; { PackBits Compression, a simple byte-oriented run length scheme.
See the PackBits section for details. Data Compression applies
only to raster image data. All other TIFF fields are unaffected. }
TiffCompressionThunderScan = 32809; { THUNDERSCAN }
TiffCompressionIT8CTPAD = 32895; { IT8CTPAD }
TiffCompressionIT8LW = 32896; { IT8LW }
TiffCompressionIT8MP = 32897; { IT8MP }
TiffCompressionIT8BL = 32898; { IT8BL }
TiffCompressionPixarFilm = 32908; { PIXARFILM }
TiffCompressionPixarLog = 32909; { PIXARLOG }
TiffCompressionDeflateZLib = 32946; { DeflatePKZip }
TiffCompressionDCS = 32947; { DCS }
TiffCompressionJBIG = 34661; { JBIG }
TiffCompressionSGILog = 34676; { SGILOG }
TiffCompressionSGILog24 = 34677; { SGILOG24 }
TiffCompressionJPEG2000 = 34712; { JP2000 }
// Planar configuration - TIFF 6.0 spec p. 38
TiffPlanarConfigurationChunky = 1; //Chunky format
TiffPlanarConfigurationPlanar = 2; //Planar format
type
TTiffChunkType = (
tctStrip,
tctTile
);
{ TTiffIFD - Image File Directory }
TTiffIFD = class
public
IFDStart: DWord; // tiff position
IFDNext: DWord; // tiff position
Artist: String;
BitsPerSample: DWord; // tiff position of entry
BitsPerSampleArray: array of Word;
CellLength: DWord;
CellWidth: DWord;
ColorMap: DWord;// tiff position of entry
Compression: DWord;
Predictor: Word;
Copyright: string;
DateAndTime: string;
DocumentName: string;
ExtraSamples: DWord;// tiff position of entry
FillOrder: DWord;
HostComputer: string;
ImageDescription: string;
ImageHeight: DWord;
ImageIsMask: Boolean;
ImageIsPage: Boolean;
ImageIsThumbNail: Boolean;
ImageWidth: DWord;
Make_ScannerManufacturer: string;
Model_Scanner: string;
Orientation: DWord;
PageNumber: word; // the page number starting at 0, the total number of pages is PageCount
PageCount: word; // see PageNumber
PageName: string;
PhotoMetricInterpretation: DWord;
PlanarConfiguration: DWord;
ResolutionUnit: DWord;
RowsPerStrip: DWord;
SamplesPerPixel: DWord;
Software: string;
StripByteCounts: DWord;// tiff position of entry
StripOffsets: DWord; // tiff position of entry
TileWidth: DWord;
TileLength: DWord; // = Height
TileOffsets: DWord; // tiff position of entry
TileByteCounts: DWord; // tiff position of entry
Tresholding: DWord;
XResolution: TTiffRational;
YResolution: TTiffRational;
// image
Img: TFPCustomImage;
FreeImg: boolean;
RedBits: word;
GreenBits: word;
BlueBits: word;
GrayBits: word;
AlphaBits: word;
BytesPerPixel: Word;
procedure Clear;
procedure Assign(IFD: TTiffIFD);
procedure ReadFPImgExtras(Src: TFPCustomImage);
function ImageLength: DWord; inline;
constructor Create;
destructor Destroy; override;
end;
function TiffRationalToStr(const r: TTiffRational): string;
function StrToTiffRationalDef(const s: string; const Def: TTiffRational): TTiffRational;
procedure ClearTiffExtras(Img: TFPCustomImage);
procedure CopyTiffExtras(SrcImg, DestImg: TFPCustomImage);
procedure WriteTiffExtras(Msg: string; Img: TFPCustomImage);
function TiffCompressionName(c: Word): string;
implementation
function TiffRationalToStr(const r: TTiffRational): string;
begin
Result:=IntToStr(r.Numerator)+'/'+IntToStr(r.Denominator);
end;
function StrToTiffRationalDef(const s: string; const Def: TTiffRational
): TTiffRational;
var
p: LongInt;
begin
Result:=Def;
p:=System.Pos('/',s);
if p<1 then exit;
Result.Numerator:=StrToIntDef(copy(s,1,p-1),TiffRational0.Numerator);
Result.Denominator:=StrToIntDef(copy(s,p+1,length(s)),TiffRational0.Denominator);
end;
procedure ClearTiffExtras(Img: TFPCustomImage);
var
i: Integer;
begin
for i:=Img.ExtraCount-1 downto 0 do
if SysUtils.CompareText(copy(Img.ExtraKey[i],1,4),'Tiff')=0 then
Img.RemoveExtra(Img.ExtraKey[i]);
end;
procedure CopyTiffExtras(SrcImg, DestImg: TFPCustomImage);
var
i: Integer;
begin
ClearTiffExtras(DestImg);
for i:=SrcImg.ExtraCount-1 downto 0 do
if SysUtils.CompareText(copy(SrcImg.ExtraKey[i],1,4),'Tiff')=0 then
DestImg.Extra[SrcImg.ExtraKey[i]]:=SrcImg.ExtraValue[i];
end;
procedure WriteTiffExtras(Msg: string; Img: TFPCustomImage);
var
i: Integer;
begin
writeln('WriteTiffExtras ',Msg);
for i:=0 to Img.ExtraCount-1 do
//if SysUtils.CompareText(copy(Img.ExtraKey[i],1,4),'Tiff')=0 then
writeln(' ',i,' ',Img.ExtraKey[i],'=',Img.ExtraValue[i]);
end;
function TiffCompressionName(c: Word): string;
begin
case c of
1: Result:='no compression';
2: Result:='CCITT Group 3 1-Dimensional Modified Huffman run length encoding';
3: Result:='CCITT Group 3 fax encoding';
4: Result:='CCITT Group 4 fax encoding';
5: Result:='LZW';
6: Result:='JPEG old style';
7: Result:='JPEG';
8: Result:='Deflate Adobe style';
9: Result:='RFC2301 JBIG white/black';
10: Result:='RFC2301 JBIG color';
32766: Result:='NeXT';
32771: Result:='CCITTRLEW';
32773: Result:='PackBits';
32809: Result:='THUNDERSCAN';
32895: Result:='IT8CTPAD';
32896: Result:='IT8LW';
32897: Result:='IT8MP';
32898: Result:='IT8BL';
32908: Result:='PIXARFILM';
32909: Result:='PIXARLOG';
32946: Result:='Deflate ZLib';
32947: Result:='DCS';
34661: Result:='JBIG';
34676: Result:='SGILOG';
34677: Result:='SGILOG24';
34712: Result:='JP2000';
else Result:='unknown('+IntToStr(c)+')';
end;
end;
{ TTiffIFD }
procedure TTiffIFD.Clear;
begin
IFDStart:=0;
IFDNext:=0;
PhotoMetricInterpretation:=High(PhotoMetricInterpretation);
PlanarConfiguration:=TiffPlanarConfigurationChunky;
Compression:=TiffCompressionNone;
Predictor:=1;
ImageHeight:=0;
ImageWidth:=0;
ImageIsThumbNail:=false;
ImageIsPage:=false;
ImageIsMask:=false;
BitsPerSample:=0;
SetLength(BitsPerSampleArray,0);
ResolutionUnit:=0;
XResolution:=TiffRational0;
YResolution:=TiffRational0;
RowsPerStrip:=0;
StripOffsets:=0;
StripByteCounts:=0;
SamplesPerPixel:=0;
Artist:='';
HostComputer:='';
ImageDescription:='';
Make_ScannerManufacturer:='';
Model_Scanner:='';
Copyright:='';
DateAndTime:='';
Software:='';
CellWidth:=0;
CellLength:=0;
FillOrder:=0;
Orientation:=0;
PageNumber:=0;
PageCount:=0;
PageName:='';
// tiles
TileWidth:=0;
TileLength:=0;
TileOffsets:=0;
TileByteCounts:=0;
Tresholding:=0;
RedBits:=0;
GreenBits:=0;
BlueBits:=0;
GrayBits:=0;
AlphaBits:=0;
BytesPerPixel:=0;
if FreeImg then begin
FreeImg:=false;
FreeAndNil(Img);
end;
end;
procedure TTiffIFD.Assign(IFD: TTiffIFD);
begin
IFDStart:=IFD.IFDStart;
IFDNext:=IFD.IFDNext;
PhotoMetricInterpretation:=IFD.PhotoMetricInterpretation;
PlanarConfiguration:=IFD.PlanarConfiguration;
Compression:=IFD.Compression;
Predictor:=IFD.Predictor;
ImageHeight:=IFD.ImageHeight;
ImageWidth:=IFD.ImageWidth;
ImageIsThumbNail:=IFD.ImageIsThumbNail;
ImageIsPage:=IFD.ImageIsPage;
ImageIsMask:=IFD.ImageIsMask;
BitsPerSample:=IFD.BitsPerSample;
BitsPerSampleArray:=IFD.BitsPerSampleArray;
ResolutionUnit:=IFD.ResolutionUnit;
XResolution:=IFD.XResolution;
YResolution:=IFD.YResolution;
RowsPerStrip:=IFD.RowsPerStrip;
StripOffsets:=IFD.StripOffsets;
StripByteCounts:=IFD.StripByteCounts;
SamplesPerPixel:=IFD.SamplesPerPixel;
Artist:=IFD.Artist;
HostComputer:=IFD.HostComputer;
ImageDescription:=IFD.ImageDescription;
Make_ScannerManufacturer:=IFD.Make_ScannerManufacturer;
Model_Scanner:=IFD.Model_Scanner;
Copyright:=IFD.Copyright;
DateAndTime:=IFD.DateAndTime;
Software:=IFD.Software;
CellWidth:=IFD.CellWidth;
CellLength:=IFD.CellLength;
FillOrder:=IFD.FillOrder;
Orientation:=IFD.Orientation;
PageNumber:=IFD.PageNumber;
PageCount:=IFD.PageCount;
PageName:=IFD.PageName;
// tiles
TileWidth:=IFD.TileWidth;
TileLength:=IFD.TileLength;
TileOffsets:=IFD.TileOffsets;
TileByteCounts:=IFD.TileByteCounts;
Tresholding:=IFD.Tresholding;
RedBits:=IFD.RedBits;
GreenBits:=IFD.GreenBits;
BlueBits:=IFD.BlueBits;
GrayBits:=IFD.GrayBits;
AlphaBits:=IFD.AlphaBits;
if (Img<>nil) and (IFD.Img<>nil) then
Img.Assign(IFD.Img);
end;
procedure TTiffIFD.ReadFPImgExtras(Src: TFPCustomImage);
begin
Clear;
PhotoMetricInterpretation:=2;
if Src.Extra[TiffPhotoMetric]<>'' then
PhotoMetricInterpretation:=
StrToInt64Def(Src.Extra[TiffPhotoMetric],High(PhotoMetricInterpretation));
Artist:=Src.Extra[TiffArtist];
Copyright:=Src.Extra[TiffCopyright];
DocumentName:=Src.Extra[TiffDocumentName];
DateAndTime:=Src.Extra[TiffDateTime];
HostComputer:=Src.Extra[TiffHostComputer];
Make_ScannerManufacturer:=Src.Extra[TiffMake_ScannerManufacturer];
Model_Scanner:=Src.Extra[TiffModel_Scanner];
ImageDescription:=Src.Extra[TiffImageDescription];
Software:=Src.Extra[TiffSoftware];
Orientation:=StrToIntDef(Src.Extra[TiffOrientation],1);
if not (Orientation in [1..8]) then
Orientation:=1;
ResolutionUnit:=StrToIntDef(Src.Extra[TiffResolutionUnit],2);
if not (ResolutionUnit in [1..3]) then
ResolutionUnit:=2;
XResolution:=StrToTiffRationalDef(Src.Extra[TiffXResolution],TiffRational72);
YResolution:=StrToTiffRationalDef(Src.Extra[TiffYResolution],TiffRational72);
PageNumber:=StrToIntDef(Src.Extra[TiffPageNumber],0);
PageCount:=StrToIntDef(Src.Extra[TiffPageCount],0);
PageName:=Src.Extra[TiffPageName];
ImageIsPage:=PageCount>0;
ImageIsThumbNail:=Src.Extra[TiffIsThumbnail]<>'';
ImageIsMask:=Src.Extra[TiffIsMask]<>'';
TileWidth:=StrToIntDef(Src.Extra[TiffTileWidth],0);
TileLength:=StrToIntDef(Src.Extra[TiffTileLength],0);
Compression:=StrToIntDef(Src.Extra[TiffCompression],TiffCompressionNone);
end;
function TTiffIFD.ImageLength: DWord;
begin
Result:=ImageHeight;
end;
constructor TTiffIFD.Create;
begin
PlanarConfiguration:=TiffPlanarConfigurationChunky;
end;
destructor TTiffIFD.Destroy;
begin
if FreeImg then
FreeAndNil(Img);
inherited Destroy;
end;
end.
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