CPictureEx类
CPictueEx类不仅可以显示GIF(包括GIF动画),还可以显示JPEG、BMP、WMF、ICO、CUR等。
参考:https://www.codeproject.com/Articles/1427/Add-GIF-animation-to-your-MFC-and-ATL-projects-wit
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//////////////////////////////////////////////////////////////////////
// PictureEx.h: declaration 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_) #pragma once #include <vector> class CPictureEx : public CStatic struct TFrame // structure that keeps a single frame info ) // turn byte alignment on enum GIFBlockTypes enum ControlExtValues // graphic control extension packed field values enum LSDPackedValues // logical screen descriptor packed field values enum IDPackedValues // image descriptor packed field values struct TGIFHeader // GIF header struct TGIFLSDescriptor // Logical Screen Descriptor unsigned char m_cPacked; // packed field unsigned char m_cBkIndex; // 1 byte. Background color index struct TGIFAppExtension // application extension block struct TGIFControlExt // graphic control extension block struct TGIFCommentExt // comment extension block struct TGIFPlainTextExt // plain text extension block struct TGIFImageDescriptor // image descriptor block #pragma pack() // turn byte alignment off public: BOOL IsGIF() const; // draws the picture (starts an animation thread if needed) // loads a picture from a file // loads a picture from a global memory block (allocated by GlobalAlloc) // loads a picture from a program resource protected: #ifdef GIF_TRACING RECT m_PaintRect; HDC m_hDispMemDC; HBITMAP m_hBitmap; void ThreadAnimation(); int GetNextBlockLen() const; // Generated message map functions DECLARE_MESSAGE_MAP() #endif // !defined(AFX_PICTUREEX_H__0EFE5DE0_7B68_4DB7_8B34_5DC634948438__INCLUDED_) |
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//////////////////////////////////////////////////////////////////////
// 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" #ifdef _DEBUG ////////////////////////////////////////////////////////////////////// inline int CPictureEx::TGIFControlExt::GetPackedValue(enum ControlExtValues Value) case GCX_PACKED_USERINPUT: case GCX_PACKED_TRANSPCOLOR: return nRet; inline int CPictureEx::TGIFLSDescriptor::GetPackedValue(enum LSDPackedValues Value) switch (Value) case LSD_PACKED_CRESOLUTION: case LSD_PACKED_SORT: case LSD_PACKED_GLOBALCTSIZE: return nRet; inline int CPictureEx::TGIFImageDescriptor::GetPackedValue(enum IDPackedValues Value) switch (Value) case ID_PACKED_INTERLACE: case ID_PACKED_SORT: case ID_PACKED_LOCALCTSIZE: return nRet; ////////////////////////////////////////////////////////////////////// CPictureEx::CPictureEx() m_pGIFLSDescriptor = NULL; m_hDispMemDC = NULL; m_bIsInitialized = FALSE; m_hExitEvent = CreateEvent(NULL, TRUE, FALSE, NULL); CPictureEx::~CPictureEx() BEGIN_MESSAGE_MAP(CPictureEx, CStatic) BOOL CPictureEx::Load(HGLOBAL hGlobal, DWORD dwSize) if (!(m_pRawData = reinterpret_cast<unsigned char *> (GlobalLock(hGlobal))) ) m_nDataSize = dwSize; ) && // clear GIF variables // don't delete memory on object's release if (OleLoadPicture(pStream, dwSize, FALSE, IID_IPicture, // store picture's size long hmWidth; HDC hDC = ::GetDC(m_hWnd); // store the picture's size // determine frame count for this picture #ifdef GIF_TRACING ) // it's an empty GIF! // now check the frame count ) // don't delete memory on object's release if (OleLoadPicture(pStream, dwSize, FALSE, IID_IPicture, pStream->Release(); TFrame frame; ResetDataPointer(); IStream *pStream = NULL; // delete memory on object's release if (OleLoadPicture(pStream, nBlockLen, FALSE, // everything went well, add this frame // clean after ourselves if (m_arrFrames.empty()) // couldn't load any frames return PrepareDC(m_PictureSize.cx, m_PictureSize.cy); void CPictureEx::UnLoad() std::vector<TFrame>::iterator it; if (m_hMemDC) if (m_hDispMemDC) SetRect(&m_PaintRect, ); BOOL CPictureEx::Draw() if (IsAnimatedGIF()) unsigned int nDummy; return FALSE; SIZE CPictureEx::GetSize() const BOOL CPictureEx::Load(LPCTSTR szFileName) CFile file; if (!file.Open(szFileName, dwSize = file.GetLength(); char *pData = reinterpret_cast<char *>(GlobalLock(hGlobal)); TRY BOOL bRetValue = Load(hGlobal, dwSize); BOOL CPictureEx::Load(UINT nResourceID , LPCTSTR szResourceType) HINSTANCE hInst = AfxFindResourceHandle(MAKEINTRESOURCE(nResourceID), RT_GROUP_ICON) ; HRSRC hPicture = NULL ; HGLOBAL hResData; // hResData is not the real HGLOBAL (we can't lock it) HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD, dwSize); char *pDest = reinterpret_cast<char *> (GlobalLock(hGlobal)); BOOL bRetValue = Load(hGlobal, dwSize); void CPictureEx::ResetDataPointer() BOOL CPictureEx::SkipNextGraphicBlock() // GIF header + LSDescriptor [+ GCT] [+ Control block] + Data enum GIFBlockTypes nBlock; nBlock = GetNextBlock(); while ((nBlock != BLOCK_CONTROLEXT) && if ((nBlock == BLOCK_UNKNOWN) || // it's either a control ext.block, an image or a plain text ) return FALSE; if (nBlock == BLOCK_CONTROLEXT) // skip everything until we meet an image block or a plain-text block if ((nBlock == BLOCK_UNKNOWN) || // skip the found data block (image or plain-text) return TRUE; UINT CPictureEx::GetSubBlocksLen(UINT nStartingOffset) const ) ; enum CPictureEx::GIFBlockTypes CPictureEx::GetNextBlock() const case 0xF9: case 0xFE: case 0xFF: case 0x3B: case 0x2C: return BLOCK_UNKNOWN; BOOL CPictureEx::SkipNextBlock() int nLen = GetNextBlockLen(); m_nCurrOffset += nLen; int CPictureEx::GetNextBlockLen() const int nTmp; switch(nBlock) case BLOCK_TRAILER: case BLOCK_APPEXT: case BLOCK_COMMEXT: case BLOCK_CONTROLEXT: case BLOCK_PLAINTEXT: case BLOCK_IMAGE: int nTmp = GetSubBlocksLen(m_nCurrOffset + ; UINT WINAPI CPictureEx::_ThreadAnimation(LPVOID pParam) pPic->m_bIsPlaying = TRUE; // this thread has finished its work so we close the handle void CPictureEx::ThreadAnimation() while (!m_bExitThread) //////// disposal method #3 if (m_hDispMemDC && m_hDispMemBM) long hmWidth; if (m_arrFrames[m_nCurrFrame].m_pPicture->Render(m_hMemDC, if (m_bExitThread) break; // if the delay time is too short (like in old GIFs), wait for 100ms if (m_bExitThread) break; // disposal method #2 void CPictureEx::Stop() // make it possible to Draw() again HGLOBAL CPictureEx::GetNextGraphicBlock(UINT *pBlockLen, // GIF header + LSDescriptor [+ GCT] [+ Control block] + Data *pDisposal = ; while ( if ((nBlock == BLOCK_UNKNOWN) || // it's either a control ext.block, an image or a plain text int nStart = m_nCurrOffset; ) return NULL; if (nBlock == BLOCK_CONTROLEXT) if (!SkipNextBlock()) return NULL; // skip everything until we find data to display while ( if ((nBlock == BLOCK_UNKNOWN) || (nBlock == BLOCK_TRAILER)) if (nBlock == BLOCK_IMAGE) if (!SkipNextBlock()) return NULL; HGLOBAL hGlobal = GlobalAlloc(GMEM_FIXED, if (!hGlobal) return NULL; ; // GMEM_FIXED means we get a pointer CopyMemory(pGlobal, m_pRawData, CopyMemory(pGlobal + nOffset, &m_pRawData[nStart], nBlockLen); pGlobal[nOffset] = 0x3B; // trailer *pBlockLen = nOffset; return hGlobal; BOOL CPictureEx::IsGIF() const BOOL CPictureEx::IsAnimatedGIF() const BOOL CPictureEx::IsPlaying() const int CPictureEx::GetFrameCount() const return m_arrFrames.size(); COLORREF CPictureEx::GetBkColor() const void CPictureEx::OnPaint() LONG nPaintWidth = m_PaintRect.right - m_PaintRect.left; ) BOOL CPictureEx::PrepareDC(int nWidth, int nHeight) HDC hWinDC = ::GetDC(m_hWnd); m_hMemDC = CreateCompatibleDC(hWinDC); m_hBitmap = CreateCompatibleBitmap(hWinDC, nWidth, nHeight); m_hOldBitmap = reinterpret_cast<HBITMAP> // fill the background ::ReleaseDC(m_hWnd, hWinDC); void CPictureEx::OnDestroy() void CPictureEx::SetBkColor(COLORREF clr) m_clrBackground = clr; HBRUSH hBrush = CreateSolidBrush(clr); #ifdef GIF_TRACING if (!file.Open(szFileName, char *pData = reinterpret_cast<char *> (GlobalLock(hData)); TRY GlobalUnlock(hData); void CPictureEx::EnumGIFBlocks() ResetDataPointer(); case BLOCK_TRAILER: case BLOCK_APPEXT: case BLOCK_COMMEXT: case BLOCK_CONTROLEXT: case BLOCK_PLAINTEXT: case BLOCK_IMAGE: SkipNextBlock(); TRACE(_T("\n")); BOOL CPictureEx::SetPaintRect(const RECT *lpRect) BOOL CPictureEx::GetPaintRect(RECT *lpRect) |
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