[转]PictureEx.h和PictureEx.cpp源文件
要显示一个gif，网上找了个，子类化了MFCl图片控件，用着方便，记一下
转自：http://www.bccn.net/Article/net/vcnet/jszl/200709/6386.html
PictureEx.h
////////////////////////////////////////////////////////////////////// // 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. // ////////////////////////////////////////////////////////////////////// #if !defined(AFX_PICTUREEX_H__0EFE5DE0_7B68_4DB7_8B34_5DC634948438__INCLUDED_) #define AFX_PICTUREEX_H__0EFE5DE0_7B68_4DB7_8B34_5DC634948438__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #include <vector> //#define GIF_TRACING // uncomment it if you want detailed TRACEs class CPictureEx : public CStatic { public: struct TFrame // structure that keeps a single frame info { IPicture *m_pPicture; // pointer to the interface used for drawing SIZE m_frameSize; SIZE m_frameOffset; UINT m_nDelay; // delay (in 1/100s of a second) UINT m_nDisposal; // disposal method }; #pragma pack(1) // turn byte alignment on enum GIFBlockTypes { BLOCK_UNKNOWN, BLOCK_APPEXT, BLOCK_COMMEXT, BLOCK_CONTROLEXT, BLOCK_PLAINTEXT, BLOCK_IMAGE, BLOCK_TRAILER }; enum ControlExtValues // graphic control extension packed field values { GCX_PACKED_DISPOSAL, // disposal method GCX_PACKED_USERINPUT, GCX_PACKED_TRANSPCOLOR }; enum LSDPackedValues // logical screen descriptor packed field values { LSD_PACKED_GLOBALCT, LSD_PACKED_CRESOLUTION, LSD_PACKED_SORT, LSD_PACKED_GLOBALCTSIZE }; enum IDPackedValues // image descriptor packed field values { ID_PACKED_LOCALCT, ID_PACKED_INTERLACE, ID_PACKED_SORT, ID_PACKED_LOCALCTSIZE }; struct TGIFHeader // GIF header { char m_cSignature[3]; // Signature - Identifies the GIF Data Stream // This field contains the fixed value 'GIF' char m_cVersion[3]; // Version number. May be one of the following: // "87a" or "89a" }; struct TGIFLSDescriptor // Logical Screen Descriptor { WORD m_wWidth; // 2 bytes. Logical screen width WORD m_wHeight; // 2 bytes. Logical screen height unsigned char m_cPacked; // packed field unsigned char m_cBkIndex; // 1 byte. Background color index unsigned char m_cPixelAspect; // 1 byte. Pixel aspect ratio inline int GetPackedValue(enum LSDPackedValues Value); }; struct TGIFAppExtension // application extension block { unsigned char m_cExtIntroducer; // extension introducer (0x21) unsigned char m_cExtLabel; // app. extension label (0xFF) unsigned char m_cBlockSize; // fixed value of 11 char m_cAppIdentifier[8]; // application identifier char m_cAppAuth[3]; // application authentication code }; struct TGIFControlExt // graphic control extension block { unsigned char m_cExtIntroducer; // extension introducer (0x21) unsigned char m_cControlLabel; // control extension label (0xF9) unsigned char m_cBlockSize; // fixed value of 4 unsigned char m_cPacked; // packed field WORD m_wDelayTime; // delay time unsigned char m_cTColorIndex; // transparent color index unsigned char m_cBlockTerm; // block terminator (0x00) public: inline int GetPackedValue(enum ControlExtValues Value); }; struct TGIFCommentExt // comment extension block { unsigned char m_cExtIntroducer; // extension introducer (0x21) unsigned char m_cCommentLabel; // comment extension label (0xFE) }; struct TGIFPlainTextExt // plain text extension block { unsigned char m_cExtIntroducer; // extension introducer (0x21) unsigned char m_cPlainTextLabel; // text extension label (0x01) unsigned char m_cBlockSize; // fixed value of 12 WORD m_wLeftPos; // text grid left position WORD m_wTopPos; // text grid top position WORD m_wGridWidth; // text grid width WORD m_wGridHeight; // text grid height unsigned char m_cCellWidth; // character cell width unsigned char m_cCellHeight; // character cell height unsigned char m_cFgColor; // text foreground color index unsigned char m_cBkColor; // text background color index }; struct TGIFImageDescriptor // image descriptor block { unsigned char m_cImageSeparator; // image separator byte (0x2C) WORD m_wLeftPos; // image left position WORD m_wTopPos; // image top position WORD m_wWidth; // image width WORD m_wHeight; // image height unsigned char m_cPacked; // packed field inline int GetPackedValue(enum IDPackedValues Value); }; #pragma pack() // turn byte alignment off public: BOOL GetPaintRect(RECT *lpRect); BOOL SetPaintRect(const RECT *lpRect); CPictureEx(); virtual ~CPictureEx(); void Stop(); // stops animation void UnLoad(); // stops animation plus releases all resources BOOL IsGIF() const; BOOL IsPlaying() const; BOOL IsAnimatedGIF() const; SIZE GetSize() const; int GetFrameCount() const; COLORREF GetBkColor() const; void SetBkColor(COLORREF clr); // draws the picture (starts an animation thread if needed) // if an animation was previously stopped by Stop(), // continues it from the last displayed frame BOOL Draw(); // loads a picture from a file // i.e. Load(_T("mypic.gif")); BOOL Load(LPCTSTR szFileName); // loads a picture from a global memory block (allocated by GlobalAlloc) // Warning: this function DOES NOT free the global memory, pointed to by hGlobal BOOL Load(HGLOBAL hGlobal, DWORD dwSize); // loads a picture from a program resource // i.e. Load(MAKEINTRESOURCE(IDR_MYPIC),_T("GIFTYPE")); BOOL Load(LPCTSTR szResourceName,LPCTSTR szResourceType); protected: #ifdef GIF_TRACING void EnumGIFBlocks(); void WriteDataOnDisk(CString szFileName, HGLOBAL hData, DWORD dwSize); #endif // GIF_TRACING RECT m_PaintRect; SIZE m_PictureSize; COLORREF m_clrBackground; UINT m_nCurrFrame; UINT m_nDataSize; UINT m_nCurrOffset; UINT m_nGlobalCTSize; BOOL m_bIsGIF; BOOL m_bIsPlaying; volatile BOOL m_bExitThread; BOOL m_bIsInitialized; HDC m_hMemDC; HDC m_hDispMemDC; HBITMAP m_hDispMemBM; HBITMAP m_hDispOldBM; HBITMAP m_hBitmap; HBITMAP m_hOldBitmap; HANDLE m_hThread; HANDLE m_hExitEvent; IPicture * m_pPicture; TGIFHeader * m_pGIFHeader; unsigned char * m_pRawData; TGIFLSDescriptor * m_pGIFLSDescriptor; std::vector<TFrame> m_arrFrames; void ThreadAnimation(); static UINT WINAPI _ThreadAnimation(LPVOID pParam); int GetNextBlockLen() const; BOOL SkipNextBlock(); BOOL SkipNextGraphicBlock(); BOOL PrepareDC(int nWidth, int nHeight); void ResetDataPointer(); enum GIFBlockTypes GetNextBlock() const; UINT GetSubBlocksLen(UINT nStartingOffset) const; HGLOBAL GetNextGraphicBlock(UINT *pBlockLen, UINT *pDelay, SIZE *pBlockSize, SIZE *pBlockOffset, UINT *pDisposal); // Generated message map functions //{{AFX_MSG(CPictureEx) afx_msg void OnDestroy(); afx_msg void OnPaint(); //}}AFX_MSG DECLARE_MESSAGE_MAP() }; #endif // !defined(AFX_PICTUREEX_H__0EFE5DE0_7B68_4DB7_8B34_5DC634948438__INCLUDED_)
PictureEx.cpp
////////////////////////////////////////////////////////////////////// // 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, GetDeviceCaps(hDC,LOGPIXELSX), 2540); m_PictureSize.cy = MulDiv(hmHeight, GetDeviceCaps(hDC,LOGPIXELSY), 2540); ::ReleaseDC(m_hWnd,hDC); } else { // it's a GIF m_bIsGIF = TRUE; m_pGIFLSDescriptor = reinterpret_cast<TGIFLSDescriptor *> (m_pRawData + sizeof(TGIFHeader)); if (m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_GLOBALCT) == 1) { // calculate the globat color table size m_nGlobalCTSize = static_cast<int> (3* (1 << (m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_GLOBALCTSIZE)+1))); // get the background color if GCT is present unsigned char *pBkClr = m_pRawData + sizeof(TGIFHeader) + sizeof(TGIFLSDescriptor) + 3*m_pGIFLSDescriptor->m_cBkIndex; m_clrBackground = RGB(pBkClr[0],pBkClr[1],pBkClr[2]); }; // store the picture's size m_PictureSize.cx = m_pGIFLSDescriptor->m_wWidth; m_PictureSize.cy = m_pGIFLSDescriptor->m_wHeight; // determine frame count for this picture UINT nFrameCount=0; ResetDataPointer(); while (SkipNextGraphicBlock()) nFrameCount++; #ifdef GIF_TRACING TRACE( _T(" -= GIF encountered\n" "Logical Screen dimensions = %dx%d\n" "Global color table = %d\n" "Color depth = %d\n" "Sort flag = %d\n" "Size of Global Color Table = %d\n" "Background color index = %d\n" "Pixel aspect ratio = %d\n" "Frame count = %d\n" "Background color = %06Xh\n\n" ), m_pGIFLSDescriptor->m_wWidth, m_pGIFLSDescriptor->m_wHeight, m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_GLOBALCT), m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_CRESOLUTION), m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_SORT), m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_GLOBALCTSIZE), m_pGIFLSDescriptor->m_cBkIndex, m_pGIFLSDescriptor->m_cPixelAspect, nFrameCount, m_clrBackground ); EnumGIFBlocks(); #endif if (nFrameCount == 0) // it's an empty GIF! { m_pRawData = NULL; GlobalUnlock(hGlobal); return FALSE; }; // now check the frame count // if there's only one frame, no need to animate this GIF // therefore, treat it like any other pic if (nFrameCount == 1) { // 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, (LPVOID *)&m_pPicture) != S_OK) { pStream->Release(); return FALSE; }; pStream->Release(); } else { // if, on the contrary, there are several frames // then store separate frames in an array TFrame frame; UINT nBlockLen; HGLOBAL hFrameData; UINT nCurFrame = 0; ResetDataPointer(); while (hFrameData = GetNextGraphicBlock(&nBlockLen, &frame.m_nDelay, &frame.m_frameSize, &frame.m_frameOffset, &frame.m_nDisposal) ) { #ifdef GIF_TRACING ////////////////////////////////////////////// // uncomment the following strings if you want // to write separate frames on disk // // CString szName; // szName.Format(_T("%.4d.gif"),nCurFrame); // WriteDataOnDisk(szName,hFrameData,nBlockLen); // nCurFrame++; #endif // GIF_TRACING IStream *pStream = NULL; // delete memory on object's release if (CreateStreamOnHGlobal(hFrameData,TRUE,&pStream) != S_OK) { GlobalFree(hFrameData); continue; }; if (OleLoadPicture(pStream,nBlockLen,FALSE, IID_IPicture, reinterpret_cast<LPVOID *>(&frame.m_pPicture)) != S_OK) { pStream->Release(); continue; }; pStream->Release(); // everything went well, add this frame m_arrFrames.push_back(frame); }; // clean after ourselves m_pRawData = NULL; GlobalUnlock(hGlobal); if (m_arrFrames.empty()) // couldn't load any frames return FALSE; }; }; // if (!IsGIF... return PrepareDC(m_PictureSize.cx,m_PictureSize.cy); } void CPictureEx::UnLoad() { Stop(); if (m_pPicture) { m_pPicture->Release(); m_pPicture = NULL; }; std::vector<TFrame>::iterator it; for (it=m_arrFrames.begin();it<m_arrFrames.end();it++) (*it).m_pPicture->Release(); m_arrFrames.clear(); if (m_hMemDC) { SelectObject(m_hMemDC,m_hOldBitmap); ::DeleteDC(m_hMemDC); ::DeleteObject(m_hBitmap); m_hMemDC = NULL; m_hBitmap = NULL; }; if (m_hDispMemDC) { SelectObject(m_hDispMemDC,m_hDispOldBM); ::DeleteDC(m_hDispMemDC); ::DeleteObject(m_hDispMemBM); m_hDispMemDC = NULL; m_hDispMemBM = NULL; }; SetRect(&m_PaintRect,0,0,0,0); m_pGIFLSDescriptor = NULL; m_pGIFHeader = NULL; m_pRawData = NULL; m_hThread = NULL; m_bIsInitialized = FALSE; m_bExitThread = 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; } BOOL CPictureEx::Draw() { if (!m_bIsInitialized) { TRACE(_T("Call one of the CPictureEx::Load() member functions before calling Draw()\n")); return FALSE; }; if (IsAnimatedGIF()) { // the picture needs animation // we'll start the thread that will handle it for us unsigned int nDummy; m_hThread = (HANDLE) _beginthreadex(NULL,0,_ThreadAnimation,this, CREATE_SUSPENDED,&nDummy); if (!m_hThread) { TRACE(_T("Draw: Couldn't start a GIF animation thread\n")); return FALSE; } else ResumeThread(m_hThread); } else { if (m_pPicture) { long hmWidth; long hmHeight; m_pPicture->get_Width(&hmWidth); m_pPicture->get_Height(&hmHeight); if (m_pPicture->Render(m_hMemDC, 0, 0, m_PictureSize.cx, m_PictureSize.cy, 0, hmHeight, hmWidth, -hmHeight, NULL) == S_OK) { Invalidate(FALSE); return TRUE; }; }; }; return FALSE; } SIZE CPictureEx::GetSize() const { return m_PictureSize; } BOOL CPictureEx::Load(LPCTSTR szFileName) { ASSERT(szFileName); CFile file; HGLOBAL hGlobal; DWORD dwSize; if (!file.Open(szFileName, CFile::modeRead | CFile::shareDenyWrite) ) { TRACE(_T("Load (file): Error opening file %s\n"),szFileName); return FALSE; }; dwSize = file.GetLength(); hGlobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD,dwSize); if (!hGlobal) { TRACE(_T("Load (file): Error allocating memory\n")); return FALSE; }; char *pData = reinterpret_cast<char*>(GlobalLock(hGlobal)); if (!pData) { TRACE(_T("Load (file): Error locking memory\n")); GlobalFree(hGlobal); return FALSE; }; TRY { file.Read(pData,dwSize); } CATCH(CFileException, e); { TRACE(_T("Load (file): An exception occured while reading the file %s\n"), szFileName); GlobalFree(hGlobal); e->Delete(); file.Close(); return FALSE; } END_CATCH GlobalUnlock(hGlobal); file.Close(); BOOL bRetValue = Load(hGlobal,dwSize); GlobalFree(hGlobal); return bRetValue; } BOOL CPictureEx::Load(LPCTSTR szResourceName, LPCTSTR szResourceType) { ASSERT(szResourceName); ASSERT(szResourceType); HRSRC hPicture = FindResource(AfxGetResourceHandle(),szResourceName,szResourceType); HGLOBAL hResData; if (!hPicture || !(hResData = LoadResource(AfxGetResourceHandle(),hPicture))) { TRACE(_T("Load (resource): Error loading resource %s\n"),szResourceName); return FALSE; }; DWORD dwSize = SizeofResource(AfxGetResourceHandle(),hPicture); // hResData is not the real HGLOBAL (we can't lock it) // let's make it real HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD,dwSize); if (!hGlobal) { TRACE(_T("Load (resource): Error allocating memory\n")); FreeResource(hResData); return FALSE; }; char *pDest = reinterpret_cast<char *> (GlobalLock(hGlobal)); char *pSrc = reinterpret_cast<char *> (LockResource(hResData)); if (!pSrc || !pDest) { TRACE(_T("Load (resource): Error locking memory\n")); GlobalFree(hGlobal); FreeResource(hResData); return FALSE; }; CopyMemory(pDest,pSrc,dwSize); FreeResource(hResData); GlobalUnlock(hGlobal); BOOL bRetValue = Load(hGlobal,dwSize); GlobalFree(hGlobal); return bRetValue; } void CPictureEx::ResetDataPointer() { // skip header and logical screen descriptor m_nCurrOffset = sizeof(TGIFHeader)+sizeof(TGIFLSDescriptor)+m_nGlobalCTSize; } BOOL CPictureEx::SkipNextGraphicBlock() { if (!m_pRawData) return FALSE; // GIF header + LSDescriptor [+ GCT] [+ Control block] + Data enum GIFBlockTypes nBlock; nBlock = GetNextBlock(); while ((nBlock != BLOCK_CONTROLEXT) && (nBlock != BLOCK_IMAGE) && (nBlock != BLOCK_PLAINTEXT) && (nBlock != BLOCK_UNKNOWN) && (nBlock != BLOCK_TRAILER) ) { if (!SkipNextBlock()) return NULL; nBlock = GetNextBlock(); }; if ((nBlock == BLOCK_UNKNOWN) || (nBlock == BLOCK_TRAILER)) return FALSE; // it's either a control ext.block, an image or a plain text if (GetNextBlockLen() <= 0) return FALSE; if (nBlock == BLOCK_CONTROLEXT) { if (!SkipNextBlock()) return FALSE; nBlock = GetNextBlock(); // skip everything until we meet an image block or a plain-text block while ((nBlock != BLOCK_IMAGE) && (nBlock != BLOCK_PLAINTEXT) && (nBlock != BLOCK_UNKNOWN) && (nBlock != BLOCK_TRAILER) ) { if (!SkipNextBlock()) return NULL; nBlock = GetNextBlock(); }; if ((nBlock == BLOCK_UNKNOWN) || (nBlock == BLOCK_TRAILER)) return FALSE; }; // skip the found data block (image or plain-text) if (!SkipNextBlock()) return FALSE; return TRUE; } UINT CPictureEx::GetSubBlocksLen(UINT nStartingOffset) const { UINT nRet = 0; UINT nCurOffset = nStartingOffset; while (m_pRawData[nCurOffset] != 0) { nRet += m_pRawData[nCurOffset]+1; nCurOffset += m_pRawData[nCurOffset]+1; }; return nRet+1; } enum CPictureEx::GIFBlockTypes CPictureEx::GetNextBlock() const { switch(m_pRawData[m_nCurrOffset]) { case 0x21: // extension block switch(m_pRawData[m_nCurrOffset+1]) { case 0x01: // plain text extension return BLOCK_PLAINTEXT; break; case 0xF9: // graphic control extension return BLOCK_CONTROLEXT; break; case 0xFE: // comment extension return BLOCK_COMMEXT; break; case 0xFF: // application extension return BLOCK_APPEXT; break; }; break; case 0x3B: // trailer return BLOCK_TRAILER; break; case 0x2C: // image data return BLOCK_IMAGE; break; }; return BLOCK_UNKNOWN; } BOOL CPictureEx::SkipNextBlock() { if (!m_pRawData) return FALSE; int nLen = GetNextBlockLen(); if ((nLen <= 0) || ((m_nCurrOffset+nLen) > m_nDataSize)) return FALSE; m_nCurrOffset += nLen; return TRUE; } int CPictureEx::GetNextBlockLen() const { GIFBlockTypes nBlock = GetNextBlock(); int nTmp; switch(nBlock) { case BLOCK_UNKNOWN: return -1; break; case BLOCK_TRAILER: return 1; break; case BLOCK_APPEXT: nTmp = GetSubBlocksLen(m_nCurrOffset+sizeof(TGIFAppExtension)); if (nTmp > 0) return sizeof(TGIFAppExtension)+nTmp; break; case BLOCK_COMMEXT: nTmp = GetSubBlocksLen(m_nCurrOffset+sizeof(TGIFCommentExt)); if (nTmp > 0) return sizeof(TGIFCommentExt)+nTmp; break; case BLOCK_CONTROLEXT: return sizeof(TGIFControlExt); break; case BLOCK_PLAINTEXT: nTmp = GetSubBlocksLen(m_nCurrOffset+sizeof(TGIFPlainTextExt)); if (nTmp > 0) return sizeof(TGIFPlainTextExt)+nTmp; break; case BLOCK_IMAGE: TGIFImageDescriptor *pIDescr = reinterpret_cast<TGIFImageDescriptor *> (&m_pRawData[m_nCurrOffset]); int nLCTSize = (int) (pIDescr->GetPackedValue(ID_PACKED_LOCALCT)*3* (1 << (pIDescr->GetPackedValue(ID_PACKED_LOCALCTSIZE)+1))); int nTmp = GetSubBlocksLen(m_nCurrOffset+ sizeof(TGIFImageDescriptor) + nLCTSize + 1); if (nTmp > 0) return sizeof(TGIFImageDescriptor) + nLCTSize + 1 + nTmp; break; }; return 0; } UINT WINAPI CPictureEx::_ThreadAnimation(LPVOID pParam) { ASSERT(pParam); CPictureEx *pPic = reinterpret_cast<CPictureEx *> (pParam); pPic->m_bIsPlaying = TRUE; pPic->ThreadAnimation(); pPic->m_bIsPlaying = FALSE; // this thread has finished its work so we close the handle CloseHandle(pPic->m_hThread); // and init the handle to zero (so that Stop() doesn't Wait on it) pPic->m_hThread = 0; return 0; } void CPictureEx::ThreadAnimation() { // first, restore background (for stop/draw support) // disposal method #2 if (m_arrFrames[m_nCurrFrame].m_nDisposal == 2) { HBRUSH hBrush = CreateSolidBrush(m_clrBackground); if (hBrush) { RECT rect = { m_arrFrames[m_nCurrFrame].m_frameOffset.cx, m_arrFrames[m_nCurrFrame].m_frameOffset.cy, m_arrFrames[m_nCurrFrame].m_frameOffset.cx + m_arrFrames[m_nCurrFrame].m_frameSize.cx, m_arrFrames[m_nCurrFrame].m_frameOffset.cy + m_arrFrames[m_nCurrFrame].m_frameSize.cy }; FillRect(m_hMemDC,&rect,hBrush); DeleteObject(hBrush); }; } else // disposal method #3 if (m_hDispMemDC && (m_arrFrames[m_nCurrFrame].m_nDisposal == 3) ) { // put it back BitBlt(m_hMemDC, m_arrFrames[m_nCurrFrame].m_frameOffset.cx, m_arrFrames[m_nCurrFrame].m_frameOffset.cy, m_arrFrames[m_nCurrFrame].m_frameSize.cx, m_arrFrames[m_nCurrFrame].m_frameSize.cy, m_hDispMemDC,0,0, SRCCOPY); // init variables SelectObject(m_hDispMemDC,m_hDispOldBM); DeleteDC(m_hDispMemDC); m_hDispMemDC = NULL; DeleteObject(m_hDispMemBM); m_hDispMemBM = NULL; }; while (!m_bExitThread) { if (m_arrFrames[m_nCurrFrame].m_pPicture) { /////////////////////////////////////////////////////// // Before rendering a frame we should take care of what's // behind that frame. TFrame::m_nDisposal will be our guide: // 0 - no disposal specified (do nothing) // 1 - do not dispose (again, do nothing) // 2 - restore to background color (m_clrBackground) // 3 - restore to previous //////// disposal method #3 if (m_arrFrames[m_nCurrFrame].m_nDisposal == 3) { // prepare a memory DC and store the background in it m_hDispMemDC = CreateCompatibleDC(m_hMemDC); m_hDispMemBM = CreateCompatibleBitmap(m_hMemDC, m_arrFrames[m_nCurrFrame].m_frameSize.cx, m_arrFrames[m_nCurrFrame].m_frameSize.cy); if (m_hDispMemDC && m_hDispMemBM) { m_hDispOldBM = reinterpret_cast<HBITMAP> (SelectObject(m_hDispMemDC,m_hDispMemBM)); BitBlt(m_hDispMemDC,0,0, m_arrFrames[m_nCurrFrame].m_frameSize.cx, m_arrFrames[m_nCurrFrame].m_frameSize.cy, m_hMemDC, m_arrFrames[m_nCurrFrame].m_frameOffset.cx, m_arrFrames[m_nCurrFrame].m_frameOffset.cy, SRCCOPY); }; }; /////////////////////// long hmWidth; long hmHeight; m_arrFrames[m_nCurrFrame].m_pPicture->get_Width(&hmWidth); m_arrFrames[m_nCurrFrame].m_pPicture->get_Height(&hmHeight); if (m_arrFrames[m_nCurrFrame].m_pPicture->Render(m_hMemDC, m_arrFrames[m_nCurrFrame].m_frameOffset.cx, m_arrFrames[m_nCurrFrame].m_frameOffset.cy, m_arrFrames[m_nCurrFrame].m_frameSize.cx, m_arrFrames[m_nCurrFrame].m_frameSize.cy, 0, hmHeight, hmWidth, -hmHeight, NULL) == S_OK) { Invalidate(FALSE); }; if (m_bExitThread) break; // if the delay time is too short (like in old GIFs), wait for 100ms if (m_arrFrames[m_nCurrFrame].m_nDelay < 5) WaitForSingleObject(m_hExitEvent, 100); else WaitForSingleObject(m_hExitEvent, 10*m_arrFrames[m_nCurrFrame].m_nDelay); if (m_bExitThread) break; // disposal method #2 if (m_arrFrames[m_nCurrFrame].m_nDisposal == 2) { HBRUSH hBrush = CreateSolidBrush(m_clrBackground); if (hBrush) { RECT rect = { m_arrFrames[m_nCurrFrame].m_frameOffset.cx, m_arrFrames[m_nCurrFrame].m_frameOffset.cy, m_arrFrames[m_nCurrFrame].m_frameOffset.cx + m_arrFrames[m_nCurrFrame].m_frameSize.cx, m_arrFrames[m_nCurrFrame].m_frameOffset.cy + m_arrFrames[m_nCurrFrame].m_frameSize.cy }; FillRect(m_hMemDC,&rect,hBrush); DeleteObject(hBrush); }; } else if (m_hDispMemDC && (m_arrFrames[m_nCurrFrame].m_nDisposal == 3) ) { // put it back BitBlt(m_hMemDC, m_arrFrames[m_nCurrFrame].m_frameOffset.cx, m_arrFrames[m_nCurrFrame].m_frameOffset.cy, m_arrFrames[m_nCurrFrame].m_frameSize.cx, m_arrFrames[m_nCurrFrame].m_frameSize.cy, m_hDispMemDC,0,0, SRCCOPY); // init variables SelectObject(m_hDispMemDC,m_hDispOldBM); DeleteDC(m_hDispMemDC); m_hDispMemDC = NULL; DeleteObject(m_hDispMemBM); m_hDispMemBM = NULL; }; }; m_nCurrFrame++; if (m_nCurrFrame == m_arrFrames.size()) { m_nCurrFrame = 0; // init the screen for the first frame, HBRUSH hBrush = CreateSolidBrush(m_clrBackground); if (hBrush) { RECT rect = {0,0,m_PictureSize.cx,m_PictureSize.cy}; FillRect(m_hMemDC,&rect,hBrush); DeleteObject(hBrush); }; }; }; } void CPictureEx::Stop() { m_bIsPlaying = FALSE; m_bExitThread = TRUE; SetEvent(m_hExitEvent); if (m_hThread) { // we'll wait for 5 seconds then continue execution WaitForSingleObject(m_hThread,5000); CloseHandle(m_hThread); m_hThread = NULL; } // make it possible to Draw() again ResetEvent(m_hExitEvent); m_bExitThread = FALSE; } HGLOBAL CPictureEx::GetNextGraphicBlock(UINT *pBlockLen, UINT *pDelay, SIZE *pBlockSize, SIZE *pBlockOffset, UINT *pDisposal) { if (!m_pRawData) return NULL; // GIF header + LSDescriptor [+ GCT] [+ Control block] + Data *pDisposal = 0; enum GIFBlockTypes nBlock; nBlock = GetNextBlock(); while ( (nBlock != BLOCK_CONTROLEXT) && (nBlock != BLOCK_IMAGE) && (nBlock != BLOCK_PLAINTEXT) && (nBlock != BLOCK_UNKNOWN) && (nBlock != BLOCK_TRAILER) ) { if (!SkipNextBlock()) return NULL; nBlock = GetNextBlock(); }; if ((nBlock == BLOCK_UNKNOWN) || (nBlock == BLOCK_TRAILER)) return NULL; // it's either a control ext.block, an image or a plain text int nStart = m_nCurrOffset; int nBlockLen = GetNextBlockLen(); if (nBlockLen <= 0) return NULL; if (nBlock == BLOCK_CONTROLEXT) { // get the following data TGIFControlExt *pControl = reinterpret_cast<TGIFControlExt *> (&m_pRawData[m_nCurrOffset]); // store delay time *pDelay = pControl->m_wDelayTime; // store disposal method *pDisposal = pControl->GetPackedValue(GCX_PACKED_DISPOSAL); if (!SkipNextBlock()) return NULL; nBlock = GetNextBlock(); // skip everything until we find data to display // (image block or plain-text block) while ( (nBlock != BLOCK_IMAGE) && (nBlock != BLOCK_PLAINTEXT) && (nBlock != BLOCK_UNKNOWN) && (nBlock != BLOCK_TRAILER) ) { if (!SkipNextBlock()) return NULL; nBlock = GetNextBlock(); nBlockLen += GetNextBlockLen(); }; if ((nBlock == BLOCK_UNKNOWN) || (nBlock == BLOCK_TRAILER)) return NULL; nBlockLen += GetNextBlockLen(); } else *pDelay = -1; // to indicate that there was no delay value if (nBlock == BLOCK_IMAGE) { // store size and offsets TGIFImageDescriptor *pImage = reinterpret_cast<TGIFImageDescriptor *> (&m_pRawData[m_nCurrOffset]); pBlockSize->cx = pImage->m_wWidth; pBlockSize->cy = pImage->m_wHeight; pBlockOffset->cx = pImage->m_wLeftPos; pBlockOffset->cy = pImage->m_wTopPos; }; if (!SkipNextBlock()) return NULL; HGLOBAL hGlobal = GlobalAlloc(GMEM_FIXED, sizeof(TGIFHeader) + sizeof(TGIFLSDescriptor) + m_nGlobalCTSize + nBlockLen + 1); // for the trailer if (!hGlobal) return NULL; int nOffset = 0; // GMEM_FIXED means we get a pointer unsigned char *pGlobal = reinterpret_cast<unsigned char *> (hGlobal); CopyMemory(pGlobal,m_pRawData, sizeof(TGIFHeader)+sizeof(TGIFLSDescriptor)+m_nGlobalCTSize); nOffset += sizeof(TGIFHeader)+sizeof(TGIFLSDescriptor)+m_nGlobalCTSize; CopyMemory(pGlobal + nOffset,&m_pRawData[nStart], nBlockLen); nOffset += nBlockLen; pGlobal[nOffset] = 0x3B; // trailer nOffset++; *pBlockLen = nOffset; return hGlobal; } BOOL CPictureEx::IsGIF() const { return m_bIsGIF; } BOOL CPictureEx::IsAnimatedGIF() const { return (m_bIsGIF && (m_arrFrames.size() > 1)); } BOOL CPictureEx::IsPlaying() const { return m_bIsPlaying; } int CPictureEx::GetFrameCount() const { if (!IsAnimatedGIF()) return 0; return m_arrFrames.size(); } COLORREF CPictureEx::GetBkColor() const { return m_clrBackground; } void CPictureEx::OnPaint() { CPaintDC dc(this); // device context for painting LONG nPaintWidth = m_PaintRect.right-m_PaintRect.left; if (nPaintWidth > 0) { LONG nPaintHeight = m_PaintRect.bottom - m_PaintRect.top; ::BitBlt(dc.m_hDC, 0, 0, nPaintWidth, nPaintHeight, m_hMemDC, m_PaintRect.left, m_PaintRect.top, SRCCOPY); } else { ::BitBlt(dc.m_hDC, 0, 0, m_PictureSize.cx, m_PictureSize.cy, m_hMemDC, 0, 0, SRCCOPY); }; } BOOL CPictureEx::PrepareDC(int nWidth, int nHeight) { SetWindowPos(NULL,0,0,nWidth,nHeight,SWP_NOMOVE | SWP_NOZORDER); HDC hWinDC = ::GetDC(m_hWnd); if (!hWinDC) return FALSE; m_hMemDC = CreateCompatibleDC(hWinDC); if (!m_hMemDC) { ::ReleaseDC(m_hWnd,hWinDC); return FALSE; }; m_hBitmap = CreateCompatibleBitmap(hWinDC,nWidth,nHeight); if (!m_hBitmap) { ::ReleaseDC(m_hWnd,hWinDC); ::DeleteDC(m_hMemDC); return FALSE; }; m_hOldBitmap = reinterpret_cast<HBITMAP> (SelectObject(m_hMemDC,m_hBitmap)); // fill the background m_clrBackground = GetSysColor(COLOR_3DFACE); RECT rect = {0,0,nWidth,nHeight}; FillRect(m_hMemDC,&rect,(HBRUSH)(COLOR_WINDOW)); ::ReleaseDC(m_hWnd,hWinDC); m_bIsInitialized = TRUE; return TRUE; } void CPictureEx::OnDestroy() { Stop(); CStatic::OnDestroy(); } void CPictureEx::SetBkColor(COLORREF clr) { if (!m_bIsInitialized) return; m_clrBackground = clr; HBRUSH hBrush = CreateSolidBrush(clr); if (hBrush) { RECT rect = {0,0,m_PictureSize.cx,m_PictureSize.cy}; FillRect(m_hMemDC,&rect,hBrush); DeleteObject(hBrush); }; } #ifdef GIF_TRACING void CPictureEx::WriteDataOnDisk(CString szFileName, HGLOBAL hData, DWORD dwSize) { CFile file; if (!file.Open(szFileName, CFile::modeCreate | CFile::modeWrite | CFile::shareDenyNone)) { TRACE(_T("WriteData: Error creating file %s\n"),szFileName); return; }; char *pData = reinterpret_cast<char *> (GlobalLock(hData)); if (!pData) { TRACE(_T("WriteData: Error locking memory\n")); return; }; TRY { file.Write(pData,dwSize); } CATCH(CFileException, e); { TRACE(_T("WriteData: An exception occured while writing to the file %s\n"), szFileName); e->Delete(); GlobalUnlock(hData); file.Close(); return; } END_CATCH GlobalUnlock(hData); file.Close(); } void CPictureEx::EnumGIFBlocks() { enum GIFBlockTypes nBlock; ResetDataPointer(); while(m_nCurrOffset < m_nDataSize) { nBlock = GetNextBlock(); switch(nBlock) { case BLOCK_UNKNOWN: TRACE(_T("- Unknown block\n")); return; break; case BLOCK_TRAILER: TRACE(_T("- Trailer block\n")); break; case BLOCK_APPEXT: TRACE(_T("- Application extension block\n")); break; case BLOCK_COMMEXT: TRACE(_T("- Comment extension block\n")); break; case BLOCK_CONTROLEXT: { TGIFControlExt *pControl = reinterpret_cast<TGIFControlExt *> (&m_pRawData[m_nCurrOffset]); TRACE(_T("- Graphic control extension block (delay %d, disposal %d)\n"), pControl->m_wDelayTime, pControl->GetPackedValue(GCX_PACKED_DISPOSAL)); }; break; case BLOCK_PLAINTEXT: TRACE(_T("- Plain text extension block\n")); break; case BLOCK_IMAGE: TGIFImageDescriptor *pIDescr = reinterpret_cast<TGIFImageDescriptor *> (&m_pRawData[m_nCurrOffset]); TRACE(_T("- Image data block (%dx%d %d,%d)\n"), pIDescr->m_wWidth, pIDescr->m_wHeight, pIDescr->m_wLeftPos, pIDescr->m_wTopPos); break; }; SkipNextBlock(); }; TRACE(_T("\n")); } #endif // GIF_TRACING BOOL CPictureEx::SetPaintRect(const RECT *lpRect) { return CopyRect(&m_PaintRect, lpRect); } BOOL CPictureEx::GetPaintRect(RECT *lpRect) { return CopyRect(lpRect, &m_PaintRect); }
