delphi比较两个位图是否相同

[Quote title="引用"]function IsBmpSame(bmp1,bmp2: TBitmap): Boolean;  
var 
  i,j: Integer;  
  ScanLine1,ScanLine2: PByteArray;  
  Count: Integer;  
begin 
  Result := (bmp1.Height = bmp2.Height) and 
            (bmp1.Width = bmp2.Width) and 
            (bmp1.PixelFormat = bmp2.PixelFormat);  
  if Result then 
  begin 
    i := Integer(bmp1.PixelFormat);  
    if i < 4 then 
      i := 4 
    else if i = 4 then 
      inc(i);  
    Count := (i - 3) * bmp1.Width - 1;  
    for i:=0 to bmp1.Height-1 do 
    begin 
      ScanLine1 := bmp1.ScanLine[i];  
      ScanLine2 := bmp2.ScanLine[i];  
      for j := 0 to Count do 
        if ScanLine1[j] <> ScanLine2[j] then 
        begin 
          Result := False;  
          Exit;  
        end;  
    end;  
  end;  
end; 

[/Quote]