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| unit PictureConvert;
interface
uses SysUtils, Dialogs, Graphics, PNGImage, JPEG;
type TPictureType=(ptNone, ptBMP, ptPNG, ptJPG);
procedure ConvertPicture(Source, Dest: String; PictureType: TPictureType);
function LoadBMPFromFile(const FileName: String): TBitmap;
function LoadPNGFromFile(const FileName: String): TBitmap;
function LoadJPGFromFile(const FileName: String): TBitmap;
procedure SaveBMPToFile(Picture: TBitmap; FileName: String);
procedure SavePNGToFile(Picture: TBitmap; FileName: String);
procedure SaveJPGToFile(Picture: TBitmap; FileName: String);
implementation
procedure ConvertPicture(Source, Dest: String; PictureType: TPictureType); var Ext: String; Picture: TBitmap; begin if Dest = '' then Dest := Copy(Source, 0, Length(Source)-Length(Ext)); if ExtractFileExt(Dest) = '' then begin if PictureType = ptBMP then Dest := Dest + '.bmp'; if PictureType = ptPNG then Dest := Dest + '.png'; if PictureType = ptJPG then Dest := Dest + '.jpg'; end;
Ext := LowerCase(ExtractFileExt(Source)); if Ext = '.jpeg' then Ext := '.jpg'; Picture := TBitmap.Create;
if Ext = '.bmp' then Picture := LoadBMPFromFile(Source); if Ext = '.png' then Picture := LoadPNGFromFile(Source); if Ext = '.jpg' then Picture := LoadJPGFromFile(Source);
if PictureType = ptBMP then SaveBMPToFile(Picture, Dest); if PictureType = ptPNG then SavePNGToFile(Picture, Dest); if PictureType = ptJPG then SaveJPGToFile(Picture, Dest); end;
function LoadBMPFromFile(const FileName: String): TBitmap; begin Result := TBitmap.Create; try Result.LoadFromFile(FileName); finally end; end;
function LoadPNGFromFile(const FileName: String): TBitmap; var PNG: TPNGObject; begin PNG := TPNGObject.Create; Result := TBitmap.Create; try PNG.LoadFromFile(FileName); Result.Assign(PNG); finally PNG.Free; end; end;
function LoadJPGFromFile(const FileName: String): TBitmap; var JPG: TJPEGImage; begin JPG := TJPEGImage.Create; Result := TBitmap.Create; try JPG.LoadFromFile(FileName); Result.Assign(JPG); finally JPG.Free; end; end;
procedure SaveBMPToFile(Picture: TBitmap; FileName: String); begin try Picture.SaveToFile(FileName); finally end; end;
procedure SavePNGToFile(Picture: TBitmap; FileName: String); var PNG: TPNGObject; begin PNG := TPNGObject.Create; try PNG.Assign(Picture); PNG.SaveToFile(FileName); finally PNG.Free; end; end;
procedure SaveJPGToFile(Picture: TBitmap; FileName: String); var JPG: TJPEGImage; begin JPG := TJPEGImage.Create; try JPG.Assign(Picture); JPG.SaveToFile(FileName); finally JPG.Free; end; end;
end. |