vc-gif-demo.rar_DEMO

////////////////////////////////////////////////////////////////////// // PictureEx.cpp: implementation of the CPictureEx class. // // Picture displaying control with support for the following formats: // GIF (including animated GIF87a and GIF89a), JPEG, BMP, WMF, ICO, CUR // // Written by Oleg Bykov (oleg_bykoff@rsdn.ru) // Copyright (c) 2001 // // To use CPictureEx, follow these steps: // - place a static control on your dialog (either a text or a bitmap) // - change its identifier to something else (e.g. IDC_MYPIC) // - associate a CStatic with it using ClassWizard // - in your dialog's header file replace CStatic with CPictureEx // (don't forget to #include "PictureEx.h" and add // PictureEx.h and PictureEx.cpp to your project) // - call one of the overloaded CPictureEx::Load() functions somewhere // (OnInitDialog is a good place to start) // - if the preceding Load() succeeded call Draw() // // You can also add the control by defining a member variable of type // CPictureEx, calling CPictureEx::Create (derived from CStatic), then // CPictureEx::Load and CPictureEx::Draw. // // By default, the control initializes its background to COLOR_3DFACE // (see CPictureEx::PrepareDC()). You can change the background by // calling CPictureEx::SetBkColor(COLORREF) after CPictureEx::Load(). // // I decided to leave in the class the functions to write separate frames from // animated GIF to disk. If you want to use them, uncomment #define GIF_TRACING // and an appropriate section in CPictureEx::Load(HGLOBAL, DWORD). These functions // won't be compiled and linked to your project unless you uncomment #define GIF_TRACING, // so you don't have to worry. // // Warning: this code hasn't been subject to a heavy testing, so // use it on your own risk. The author accepts no liability for the // possible damage caused by this code. // // Version 1.0 7 Aug 2001 // Initial release // // Version 1.1 6 Sept 2001 // ATL version of the class // // Version 1.2 14 Oct 2001 // - Fixed a problem with loading GIFs from resources // in MFC-version of the class for multi-modules apps. // Thanks to Ruben Avila-Carretero for finding this out. // // - Got rid of waitable timer in ThreadAnimation() // Now CPictureEx[Wnd] works in Win95 too. // Thanks to Alex Egiazarov and Wayne King for the idea. // // - Fixed a visual glitch of using SetBkColor. // Thanks to Kwangjin Lee for finding this out. // // Version 1.3 10 Nov 2001 // - Fixed a DC leak. One DC leaked per each UnLoad() // (forgot to put a ReleaseDC() in the end of // CPictureExWnd::PrepareDC() function). // // - Now it is possible to set a clipping rectangle using // CPictureEx[Wnd]::SetPaintRect(const LPRECT) function. // The LPRECT parameter tells the class what portion of // a picture should it display. If the clipping rect is // not set, the whole picture is shown. // Thanks to Fabrice Rodriguez for the idea. // // - Added support for Stop/Draw. Now you can Stop() an // animated GIF, then Draw() it again, it will continue // animation from the frame it was stopped on. You can // also know if a GIF is currently playing with the // IsPlaying() function. // // - Got rid of math.h and made m_bExitThread volatile. // Thanks to Piotr Sawicki for the suggestion. // ////////////////////////////////////////////////////////////////////// #include "stdafx.h" #include "PictureEx.h" #include <process.h> #ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #define new DEBUG_NEW #endif ////////////////////////////////////////////////////////////////////// // Nested structures member functions ////////////////////////////////////////////////////////////////////// inline int CPictureEx::TGIFControlExt::GetPackedValue(enum ControlExtValues Value) { int nRet = (int)m_cPacked; switch (Value) { case GCX_PACKED_DISPOSAL: nRet = (nRet & 28) >> 2; break; case GCX_PACKED_USERINPUT: nRet = (nRet & 2) >> 1; break; case GCX_PACKED_TRANSPCOLOR: nRet &= 1; break; }; return nRet; } inline int CPictureEx::TGIFLSDescriptor::GetPackedValue(enum LSDPackedValues Value) { int nRet = (int)m_cPacked; switch (Value) { case LSD_PACKED_GLOBALCT: nRet = nRet >> 7; break; case LSD_PACKED_CRESOLUTION: nRet = ((nRet & 0x70) >> 4) + 1; break; case LSD_PACKED_SORT: nRet = (nRet & 8) >> 3; break; case LSD_PACKED_GLOBALCTSIZE: nRet &= 7; break; }; return nRet; } inline int CPictureEx::TGIFImageDescriptor::GetPackedValue(enum IDPackedValues Value) { int nRet = (int)m_cPacked; switch (Value) { case ID_PACKED_LOCALCT: nRet >>= 7; break; case ID_PACKED_INTERLACE: nRet = ((nRet & 0x40) >> 6); break; case ID_PACKED_SORT: nRet = (nRet & 0x20) >> 5; break; case ID_PACKED_LOCALCTSIZE: nRet &= 7; break; }; return nRet; } ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// CPictureEx::CPictureEx() { // check structures size ASSERT(sizeof(TGIFImageDescriptor) == 10); ASSERT(sizeof(TGIFAppExtension) == 14); ASSERT(sizeof(TGIFPlainTextExt) == 15); ASSERT(sizeof(TGIFLSDescriptor) == 7); ASSERT(sizeof(TGIFControlExt) == 8); ASSERT(sizeof(TGIFCommentExt) == 2); ASSERT(sizeof(TGIFHeader) == 6); m_pGIFLSDescriptor = NULL; m_pGIFHeader = NULL; m_pPicture = NULL; m_pRawData = NULL; m_hThread = NULL; m_hBitmap = NULL; m_hMemDC = NULL; m_hDispMemDC = NULL; m_hDispMemBM = NULL; m_hDispOldBM = NULL; m_bIsInitialized = FALSE; m_bExitThread = FALSE; m_bIsPlaying = FALSE; m_bIsGIF = FALSE; m_clrBackground = RGB(255,255,255); // white by default m_nGlobalCTSize = 0; m_nCurrOffset = 0; m_nCurrFrame = 0; m_nDataSize = 0; m_PictureSize.cx = m_PictureSize.cy = 0; SetRect(&m_PaintRect,0,0,0,0); m_hExitEvent = CreateEvent(NULL,TRUE,FALSE,NULL); } CPictureEx::~CPictureEx() { UnLoad(); CloseHandle(m_hExitEvent); } BEGIN_MESSAGE_MAP(CPictureEx, CStatic) //{{AFX_MSG_MAP(CPictureEx) ON_WM_DESTROY() ON_WM_PAINT() //}}AFX_MSG_MAP END_MESSAGE_MAP() BOOL CPictureEx::Load(HGLOBAL hGlobal, DWORD dwSize) { IStream *pStream = NULL; UnLoad(); if (!(m_pRawData = reinterpret_cast<unsigned char*> (GlobalLock(hGlobal))) ) { TRACE(_T("Load: Error locking memory\n")); return FALSE; }; m_nDataSize = dwSize; m_pGIFHeader = reinterpret_cast<TGIFHeader *> (m_pRawData); if ((memcmp(&m_pGIFHeader->m_cSignature,"GIF",3) != 0) && ((memcmp(&m_pGIFHeader->m_cVersion,"87a",3) != 0) || (memcmp(&m_pGIFHeader->m_cVersion,"89a",3) != 0)) ) { // it's neither GIF87a nor GIF89a // do the default processing // clear GIF variables m_pRawData = NULL; GlobalUnlock(hGlobal); // don't delete memory on object's release if (CreateStreamOnHGlobal(hGlobal,FALSE,&pStream) != S_OK) return FALSE; if (OleLoadPicture(pStream,dwSize,FALSE,IID_IPicture, reinterpret_cast<LPVOID *>(&m_pPicture)) != S_OK) { pStream->Release(); return FALSE; }; pStream->Release(); // store picture's size long hmWidth; long hmHeight; m_pPicture->get_Width(&hmWidth); m_pPicture->get_Height(&hmHeight); HDC hDC = ::GetDC(m_hWnd); m_PictureSize.cx = MulDiv(hmWidth, GetDevice