function  TWMImages.FGetImageBitmap (index: integer): TBitmap;
begin
   Result:=nil;
   if LibType <> ltLoadBmp then exit;
   Result := GetCachedBitmap (index);
   {if index in [0..BmpList.Count-1] then begin
      Result := TBitmap (BmpList[index]);
   end else
      Result := nil;}
end;

procedure TWMImages.FSetDxDraw (fdd: TDxDraw);
begin
   FDxDraw := fdd;
end;

// *** DirectDrawSurface Functions

procedure TWMImages.LoadDxImage (position: integer; pdximg: PTDxImage);
var
   imginfo: TWMImageInfo;
   ddsd: TDDSurfaceDesc;
   SBits, PSrc, DBits: PByte;
   n, slen, dlen: integer;
   nErrorCode:Integer;

begin
   m_FileStream.Seek (position, 0);
   if btVersion <> 0 then m_FileStream.Read (imginfo, SizeOf(TWMImageInfo)-4)
   else m_FileStream.Read (imginfo, SizeOf(TWMImageInfo));


   if g_boUseDIBSurface then begin //DIB
      //非全屏時
      try
      lsDib.Clear;
      lsDib.Width := imginfo.nWidth;
      lsDib.Height := imginfo.nHeight;
      except
      end;
      lsDib.ColorTable := MainPalette;
      lsDib.UpdatePalette;
      DBits := lsDib.PBits;
      m_FileStream.Read (DBits^, imginfo.nWidth * imgInfo.nHeight);


      pdximg.nPx := imginfo.px;
      pdximg.nPy := imginfo.py;
      pdximg.surface := TDirectDrawSurface.Create (FDDraw);
      pdximg.surface.SystemMemory := TRUE;
      pdximg.surface.SetSize (imginfo.nWidth, imginfo.nHeight);
      pdximg.surface.Canvas.Draw (0, 0, lsDib);
      pdximg.surface.Canvas.Release;

      pdximg.surface.TransparentColor := 0;
   end else begin //
      //非全屏時   
      slen  := WidthBytes(imginfo.nWidth);
      GetMem (PSrc, slen * imgInfo.nHeight);
      SBits := PSrc;
      m_FileStream.Read (PSrc^, slen * imgInfo.nHeight);
      try
         pdximg.surface := TDirectDrawSurface.Create (FDDraw);
         pdximg.surface.SystemMemory := TRUE;
         pdximg.surface.SetSize (slen, imginfo.nHeight);
         //pdximg.surface.Palette := MainSurfacePalette;

         pdximg.nPx := imginfo.px;
         pdximg.nPy := imginfo.py;
         ddsd.dwSize := SizeOf(ddsd);

         pdximg.surface.Lock (TRect(nil^), ddsd);
         DBits := ddsd.lpSurface;
         for n:=imginfo.nHeight - 1 downto 0 do begin
            SBits := PByte (Integer(PSrc) + slen * n);
            Move(SBits^, DBits^, slen);
            Inc (integer(DBits), ddsd.lPitch);
         end;
         pdximg.surface.TransparentColor := 0;
      finally
        pdximg.surface.UnLock();
        FreeMem (PSrc);
      end;
   end;
end;

procedure TWMImages.LoadBmpImage (position: integer; pbmpimg: PTBmpImage);
var
   imginfo: TWMImageInfo;
   ddsd: TDDSurfaceDesc;
   DBits: PByte;
   n, slen, dlen: integer;
begin
   m_FileStream.Seek (position, 0);
   m_FileStream.Read (imginfo, sizeof(TWMImageInfo)-4);

   lsDib.Width := imginfo.nWidth;
   lsDib.Height := imginfo.nHeight;
   lsDib.ColorTable := MainPalette;
   lsDib.UpdatePalette;
   DBits := lsDib.PBits;
   m_FileStream.Read (DBits^, imginfo.nWidth * imgInfo.nHeight);

   pbmpimg.bmp := TBitmap.Create;
   pbmpimg.bmp.Width := lsDib.Width;
   pbmpimg.bmp.Height := lsDib.Height;
   pbmpimg.bmp.Canvas.Draw (0, 0, lsDib);
   lsDib.Clear;
end;

procedure TWMImages.ClearCache;
var
   i: integer;
begin
   for i:=0 to ImageCount - 1 do begin
      if m_ImgArr[i].Surface <> nil then begin
         m_ImgArr[i].Surface.Free;
         m_ImgArr[i].Surface := nil;
      end;
   end;
   //MemorySize := 0;
end;

function  TWMImages.GetImage (index: integer; var px, py: integer): TDirectDrawSurface;
begin
   if (index >= 0) and (index < ImageCount) then begin
      px := m_ImgArr[index].nPx;
      py := m_ImgArr[index].nPy;
      Result := m_ImgArr[index].surface;
   end else
      Result := nil;
end;

{--------------- BMP functions ----------------}

//
procedure TWMImages.FreeOldBmps;
var
   i, n, ntime, curtime, limit: integer;
begin
   n := -1;
   ntime := 0;
   //limit := FMaxMemorySize * 9 div 10;
   for i:=0 to ImageCount-1 do begin
      curtime := GetTickCount;
      if m_BmpArr[i].Bmp <> nil then begin
         if GetTickCount - m_BmpArr[i].dwLatestTime > 5 * 1000 then begin
            //MemorySize := MemorySize - BmpArr[i].Bmp.Width * BmpArr[i].Bmp.Height;
            m_BmpArr[i].Bmp.Free;
            m_BmpArr[i].Bmp := nil;
         end else begin
            if GetTickCount - m_BmpArr[i].dwLatestTime > ntime then begin
               ntime := GetTickCount - m_BmpArr[i].dwLatestTime;
               n := i;
            end;
         end;
      end;
      //if MemorySize < limit then begin
      //   n := -1;
      //   break;
      //end;
   end;
   //if n >= 0 then begin
   //   MemorySize := MemorySize - BmpArr[n].Bmp.Width * BmpArr[n].Bmp.Height;
   //   BmpArr[n].Bmp.FreeImage;
   //   BmpArr[n].Bmp.Free;
   //   BmpArr[n].Bmp := nil;
   //end;
end;

procedure TWMImages.FreeBitmap (index: integer);
begin
   if (index >= 0) and (index < ImageCount) then begin
      if m_BmpArr[index].Bmp <> nil then begin
         //MemorySize  := MemorySize - BmpArr[index].Bmp.Width * BmpArr[index].Bmp.Height;
         //if MemorySize < 0 then MemorySize := 0;
         m_BmpArr[index].Bmp.FreeImage;
         m_BmpArr[index].Bmp.Free;
         m_BmpArr[index].Bmp := nil;
      end;
   end;
end;


//坷貳等 某矯 瘤框
procedure TWMImages.FreeOldMemorys;
var
   i, n, ntime, curtime, limit: integer;
begin
   n := -1;
   ntime := 0;
   //limit := FMaxMemorySize * 9 div 10;
   curtime := GetTickCount;
   for i:=0 to ImageCount-1 do begin
      if m_ImgArr[i].Surface <> nil then begin
         if GetTickCount - m_ImgArr[i].dwLatestTime > 5 * 60 * 1000 then begin
            //MemorySize := MemorySize - ImgArr[i].Surface.Width * ImgArr[i].Surface.Height;
            m_ImgArr[i].Surface.Free;
            m_ImgArr[i].Surface := nil;
         end;
      end;
      //if MemorySize < limit then begin
      //   n := -1;
      //   break;
      //end;
   end;
end;

//Cache甫 撈儈竊
function  TWMImages.GetCachedSurface (index: integer): TDirectDrawSurface;
var
  nPosition:Integer;
  nErrCode:Integer;
begin
  Result := nil;
  nErrCode:=0;
  try
  if (index < 0) or (index >= ImageCount) then exit;
  if GetTickCount - m_dwMemChecktTick > 10000 then  begin
      m_dwMemChecktTick := GetTickCount;
      //if MemorySize > FMaxMemorySize then begin
      FreeOldMemorys;
      //end;
   end;
   nErrCode:=1;
   if m_ImgArr[index].Surface = nil then begin //cache登絹 樂瘤 臼瀾. 貨肺 佬絹具竊.
      if index < m_IndexList.Count then begin
         nPosition:= Integer(m_IndexList[index]);
         LoadDxImage (nPosition, @m_ImgArr[index]);
         m_ImgArr[index].dwLatestTime := GetTickCount;
         nErrCode:=2;
         Result := m_ImgArr[index].Surface;
         //MemorySize := MemorySize + ImgArr[index].Surface.Width * ImgArr[index].Surface.Height;
      end;
   end else begin
      m_ImgArr[index].dwLatestTime := GetTickCount;
      nErrCode:=3;
      Result := m_ImgArr[index].Surface;
   end;

   except
    //DebugOutStr ('GetCachedSurface 3 Index: ' + IntToStr(index) + ' Error Code: ' + IntToStr(nErrCode));
   end;
end;

function  TWMImages.GetCachedImage (index: integer; var px, py: integer): TDirectDrawSurface;
var
   position: integer;
   nErrCode:Integer;   
begin
   Result := nil;
   nErrCode:=0;
   try
   if (index < 0) or (index >= ImageCount) then exit;
   if GetTickCount - m_dwMemChecktTick > 10000 then  begin
      m_dwMemChecktTick := GetTickCount;
      //if MemorySize > FMaxMemorySize then begin
      FreeOldMemorys;
      //end;
   end;
   nErrCode:=1;
   if m_ImgArr[index].Surface = nil then begin //cache
      if index < m_IndexList.Count then begin
         position := Integer(m_IndexList[index]);
         LoadDxImage (position, @m_ImgArr[index]);
         m_ImgArr[index].dwLatestTime := GetTickCount;
         px := m_ImgArr[index].nPx;
         py := m_ImgArr[index].nPy;
         Result := m_ImgArr[index].Surface;
         //MemorySize := MemorySize + ImgArr[index].Surface.Width * ImgArr[index].Surface.Height;
      end;

   end else begin
      m_ImgArr[index].dwLatestTime := GetTickCount;
      px := m_ImgArr[index].nPx;
      py := m_ImgArr[index].nPy;
      Result := m_ImgArr[index].Surface;
   end;
   except
    //DebugOutStr ('GetCachedImage 3 Index: ' + IntToStr(index) + ' Error Code: ' + IntToStr(nErrCode));
   end;
end;

function  TWMImages.GetCachedBitmap (index: integer): TBitmap;
var
   position: integer;
begin
   Result := nil;
   if (index < 0) or (index >= ImageCount) then exit;
   if m_BmpArr[index].Bmp = nil then begin //cache登絹 樂瘤 臼瀾. 貨肺 佬絹具竊.
      if index < m_IndexList.Count then begin
         position := Integer(m_IndexList[index]);
         LoadBmpImage (position, @m_BmpArr[index]);
         m_BmpArr[index].dwLatestTime := GetTickCount;
         Result := m_BmpArr[index].Bmp;
         //MemorySize := MemorySize + BmpArr[index].Bmp.Width * BmpArr[index].Bmp.Height;
         //if (MemorySize > FMaxMemorySize) then begin
         FreeOldBmps;
         //end;
      end;
   end else begin
      m_BmpArr[index].dwLatestTime:=GetTickCount;
      Result := m_BmpArr[index].Bmp;
   end;
end;

procedure TWMImages.DrawZoom (paper: TCanvas; x, y, index: integer; zoom: Real);
var
   rc: TRect;
   bmp: TBitmap;
begin
   if LibType <> ltLoadBmp then exit;
   //if index > BmpList.Count-1 then exit;
   bmp := Bitmaps[index];
   if bmp <> nil then begin
      rc.Left := x;
      rc.Top  := y;
      rc.Right := x + Round (bmp.Width * zoom);
      rc.Bottom := y + Round (bmp.Height * zoom);
      if (rc.Right > rc.Left) and (rc.Bottom > rc.Top) then begin
         paper.StretchDraw (rc, Bmp);
         FreeBitmap (index);
      end;
   end;
end;

procedure TWMImages.DrawZoomEx (paper: TCanvas; x, y, index: integer; zoom: Real; leftzero: Boolean);
var
   rc: TRect;
   bmp, bmp2: TBitmap;
begin
   if LibType <> ltLoadBmp then exit;
   //if index > BmpList.Count-1 then exit;
   bmp := Bitmaps[index];
   if bmp <> nil then begin
      Bmp2 := TBitmap.Create;
      Bmp2.Width := Round (Bmp.Width * zoom);
      Bmp2.Height := Round (Bmp.Height * zoom);
      rc.Left := x;
      rc.Top  := y;
      rc.Right := x + Round (bmp.Width * zoom);
      rc.Bottom := y + Round (bmp.Height * zoom);
      if (rc.Right > rc.Left) and (rc.Bottom > rc.Top) then begin
         Bmp2.Canvas.StretchDraw (Rect(0, 0, Bmp2.Width, Bmp2.Height), Bmp);
         if leftzero then begin
            SpliteBitmap (paper.Handle, X, Y, Bmp2, $0)
         end else begin
            SpliteBitmap (paper.Handle, X, Y-Bmp2.Height, Bmp2, $0);
         end;
      end;
      FreeBitmap (index);
      bmp2.Free;
   end;
end;




end.