www.pudn.com > PictureEx_demo.rar > 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//#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 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_)