unit tinyJPGGIFBMP;
//  file: tinyJPGGIFBMP.pas
//  file version: 0.35
//  last modified: 05.01.06
//  package: GRushControls
//  author: Karpinskyj Alexandr aka homm
//      mailto: homm86@mail.ru
//      My humble Web-Page: http://www.homm86.narod.ru
interface

uses
  Windows, KOL, ActiveX;

type
  TBitmapmod = object(TBitMap)
  end;

const
  IID_IPicture: TGUID = '{7BF80980-BF32-101A-8BBB-00AA00300CAB}';

procedure tinyLoadJPGGIFBMPFile(var TargetBitmap: PBitMap; FileName: String);
procedure tinyLoadJPGGIFBMPMemory(var TargetBitmap: PBitMap; Ptr: HGlobal; Size: DWORD);
procedure tinyLoadJPGGIFBMPResource(var TargetBitmap: PBitMap; Inst : HInst; ResName : PChar; ResType : PChar);
procedure tinyLoadJPGGIFBMPString(const s: String; out TargetBitmap: PBitMap);


function SHCreateStreamOnFileA(FileName: PChar; grfMode: DWORD; var stream: IStream): HResult; stdcall; external 'shlwapi.dll';

implementation

procedure OleFree(Picta: IPicture);
{begin
    if Picta <> nil then
        Picta._Release;}
asm
  push eax
  mov eax, esp
  call System.@IntFClear
  pop eax
end;

procedure tinyLoadJPGGIFBMPFile(var TargetBitmap: PBitMap; FileName: String);
var
  Stream: IStream;
  Picta:  IPicture;
  hh:     OLE_HANDLE;
asm
    //[ebx] = PBitmap;
    //edi = FileName;
    push ebx
    push edi
    mov ebx, eax
    mov edi, edx
    //BitMap := nil;
    xor eax, eax
    mov [ebx], eax
    //SHCreateStreamOnFileA(PChar(FileName), 0, Stream);
    lea eax, [Stream]
        push eax
        push $00
        push edi //FileName
        call SHCreateStreamOnFileA
    //if Stream=nil then exit;
    cmp Dword ptr [Stream], $00
    jz @@EXIT
    //OleLoadPicture(Stream, FileSize(FileName), false, IID_IPicture, Picta);
    lea eax, [Picta]
        push eax
        push offset IID_IPicture
        push $00
    mov eax, edi //FileName
    call KOL.FileSize
        push eax
    mov eax, [Stream]
        push eax
        call ActiveX.OleLoadPicture
    //if Picta = nil then exit;
    cmp Dword ptr [Picta], $00
    jz @@EXIT
    //Picta.get_Handle(hh);
    lea eax, [hh]
        push eax
    mov edx, [Picta]
        push edx
    mov eax, [edx]
        call dword ptr [eax+$0c]
    //BitMap := NewBitMap(0, 0);
    xor eax, eax
    xor edx, edx
    call NewBitmap
    mov [ebx], eax
    //BitMap.Handle := hh;
    mov edx, [hh]
    call TBitMapMod.SetHandle
    //BitMap.Add2AutoFreeEx(TObjectMethod(MakeMethod(Pointer(Picta), @OleFree)));
    mov eax, [Picta]
    push eax
    push offset OleFree
    mov eax, [ebx]
    call TObj.Add2AutoFreeEx

@@EXIT:
    lea eax, [Stream]
    call System.@IntFClear

    pop edi
    pop ebx
end;

procedure tinyLoadJPGGIFBMPMemory(var TargetBitmap: PBitMap; Ptr: HGlobal; Size: DWORD);
var
  Stream: IStream;
  Picta:  IPicture;
  hh:     OLE_HANDLE;
begin
  TargetBitmap := nil;
  if CreateStreamOnHGlobal(ptr, TRUE, Stream) <> S_OK then
    exit;
  if OleLoadPicture(Stream, Size, false, IID_IPicture, Picta) <> S_OK then
    exit;
  Picta.get_Handle(hh);
  Picta._AddRef;
  TargetBitmap := NewBitmap(0, 0);
  TargetBitmap.Handle := hh;
  TargetBitmap.Add2AutoFreeEx(TObjectMethod(MakeMethod(Pointer(Picta), @OleFree)));
end;

procedure tinyLoadJPGGIFBMPResource(var TargetBitmap: PBitMap; Inst : HInst; ResName : PChar; ResType : PChar);
var
  G: Pointer;
  Sz: DWORD;
  Ptr: Pointer;
  Resource: HRSRC;
begin
  Resource := FindResource(Inst, ResName, ResType);
  Sz := SizeofResource(Inst, Resource);
  DWORD(G) := LoadResource(hinstance, Resource);
  DWORD(Ptr) := LocalAlloc(GMEM_FIXED, Sz);
  move(g^, Ptr^, Sz);
  tinyLoadJPGGIFBMPMemory(TargetBitmap, DWORD(Ptr), Sz);
end;

procedure tinyLoadJPGGIFBMPString(const s: String; out TargetBitmap: PBitMap);
var
  hh:     OLE_HANDLE;
  hPtr:   DWORD;
  len:    Integer;
  Stream: IStream;
  Picta:  IPicture;
begin
  TargetBitmap := nil;
  // global
  len := Length(s);
  if (len > 0) then begin
    hPtr := GlobalAlloc(GPTR, len);
    if (hPtr <> 0) then begin
      CopyMemory(Pointer(hPtr), @s[1], len);
      // create istream
      if (CreateStreamOnHGlobal(hPtr, False, Stream) = S_OK) then begin
        // oleload
        if (OleLoadPicture(Stream, len, False, IID_IPicture, Picta) = S_OK) then begin
          Picta.get_Handle(hh);
          Picta._AddRef;
          TargetBitmap := NewBitmap(0, 0);
          TargetBitmap.Handle := hh;
          TargetBitmap.Add2AutoFreeEx(TObjectMethod(MakeMethod(Pointer(Picta), @OleFree)));
        end;
      end;
      GlobalFree(hPtr);
    end;
  end;
end;

(*function OleLoadPictureFile(varFileName: OleVariant; var lpdispPicture: IPictureDisp): HResult; stdcall; external 'oleaut32.dll';
function OleLoadPicturePath(szURLorPath: PWideChar; unkCaller: IUnknown; dwReserved: Integer; clrReserved: DWORD; const iid: TGUID; ppvRet: Pointer): HResult; stdcall; external 'oleaut32.dll';

procedure tinyLoadJPGGIFBMP_(const fn: String; out TargetBitmap: PBitMap);
var
  hh:          DWORD;
  Picta:       IPicture;
  dispPicture: IPictureDisp;
begin
  TargetBitmap := nil;
  // load
  {if (OleLoadPictureFile(fn, dispPicture) = S_OK) then begin
    dispPicture.QueryInterface(IID_IPicture, Picta);
    Picta.get_Handle(hh);
    Picta._AddRef;
    TargetBitmap := NewBitmap(0, 0);
    TargetBitmap.Handle := hh;
    TargetBitmap.Add2AutoFreeEx(TObjectMethod(MakeMethod(Pointer(Picta), @OleFree)));
  end;}
  if (OleLoadPicturePath(PWideChar(WideString(fn)), nil, 0, 0, IID_IPicture, @Picta) = S_OK) then begin
    Picta.get_Handle(hh);
    Picta._AddRef;
    TargetBitmap := NewBitmap(0, 0);
    TargetBitmap.Handle := hh;
    TargetBitmap.Add2AutoFreeEx(TObjectMethod(MakeMethod(Pointer(Picta), @OleFree)));
  end;
end;*)


end.