本文整理自网络，侵删。
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;
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