PictureEx.cpp
上传用户:xiuanze55
上传日期:2013-06-16
资源大小:85k
文件大小:27k
- //////////////////////////////////////////////////////////////////////
- // PictureEx.cpp: implementation of the CPicture 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)
- //
- // Modified by jingzhou Xu
- //////////////////////////////////////////////////////////////////////
- #include "stdafx.h"
- #include "PictureEx.h"
- #include <math.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_bIsInitialized = FALSE;
- m_bExitThread = FALSE;
- m_bIsGIF = FALSE;
- m_clrBackground = RGB(255,255,255); // white by default
- m_nGlobalCTSize = 0;
- m_nCurrOffset = 0;
- m_nDataSize = 0;
- m_PictureSize.cx = m_PictureSize.cy = 0;
- m_hExitEvent = CreateEvent(NULL,TRUE,FALSE,NULL);
- }
- CPictureEx::~CPictureEx()
- {
- UnLoad();
- CloseHandle(m_hExitEvent);
- }
- BEGIN_MESSAGE_MAP(CPictureEx, CStatic)
- //{{AFX_MSG_MAP(CMyStatic)
- 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 memoryn"));
- 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*pow(2,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 encounteredn"
- "Logical Screen dimensions = %dx%dn"
- "Global color table = %dn"
- "Color depth = %dn"
- "Sort flag = %dn"
- "Size of Global Color Table = %dn"
- "Background color index = %dn"
- "Pixel aspect ratio = %dn"
- "Frame count = %dn"
- "Background color = %06Xhnn"
- ),
- 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;
- };
- 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_nDataSize = 0;
- }
- BOOL CPictureEx::Draw()
- {
- if (!m_bIsInitialized)
- {
- TRACE(_T("Call of one the CPictureEx::Load() member functions before calling Draw()n"));
- return FALSE;
- };
- if (IsAnimatedGIF())
- {
- // the picture needs some 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 threadn"));
- 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 %sn"),szFileName);
- return FALSE;
- };
- dwSize = file.GetLength();
- hGlobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD,dwSize);
- if (!hGlobal)
- {
- TRACE(_T("Load (file): Error allocating memoryn"));
- return FALSE;
- };
-
- char *pData = reinterpret_cast<char*>(GlobalLock(hGlobal));
- if (!pData)
- {
- TRACE(_T("Load (file): Error locking memoryn"));
- GlobalFree(hGlobal);
- return FALSE;
- };
- TRY
- {
- file.Read(pData,dwSize);
- }
- CATCH(CFileException, e);
- {
- TRACE(_T("Load (file): An exception occured while reading the file %sn"),
- szFileName);
- GlobalFree(hGlobal);
- //e->Delete(); // DO NOT CALL THIS, CAN CAUSE CRASH. majun, 7.31
- 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 %sn"),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("Load (resource): Error allocating memoryn");
- 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 memoryn"));
- 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*
- pow(2,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->ThreadAnimation();
- // 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()
- {
- int nTemp = 0;
- while (!m_bExitThread)
- {
- if (m_arrFrames[nTemp].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
- HDC hMemDC = NULL;
- HBITMAP hMemBM = NULL, hOldBM;
- if (m_arrFrames[nTemp].m_nDisposal == 3)
- {
- // prepare a memory DC and store the background in it
- hMemDC = CreateCompatibleDC(m_hMemDC);
- hMemBM = CreateCompatibleBitmap(m_hMemDC,
- m_arrFrames[nTemp].m_frameSize.cx,
- m_arrFrames[nTemp].m_frameSize.cy);
-
- if (hMemDC && hMemBM)
- {
- hOldBM = reinterpret_cast<HBITMAP> (SelectObject(hMemDC,hMemBM));
- BitBlt(hMemDC,0,0,
- m_arrFrames[nTemp].m_frameSize.cx,
- m_arrFrames[nTemp].m_frameSize.cy,
- m_hMemDC,
- m_arrFrames[nTemp].m_frameOffset.cx,
- m_arrFrames[nTemp].m_frameOffset.cy,
- SRCCOPY);
- };
- };
- ///////////////////////
- long hmWidth;
- long hmHeight;
- m_arrFrames[nTemp].m_pPicture->get_Width(&hmWidth);
- m_arrFrames[nTemp].m_pPicture->get_Height(&hmHeight);
- if (m_arrFrames[nTemp].m_pPicture->Render(m_hMemDC,
- m_arrFrames[nTemp].m_frameOffset.cx,
- m_arrFrames[nTemp].m_frameOffset.cy,
- m_arrFrames[nTemp].m_frameSize.cx,
- m_arrFrames[nTemp].m_frameSize.cy,
- 0, hmHeight, hmWidth, -hmHeight, NULL) == S_OK)
- {
- Invalidate(FALSE);
- };
-
- if (m_bExitThread)
- {
- if (hMemDC)
- {
- // dispose local variables
- SelectObject(hMemDC,hOldBM);
- DeleteDC(hMemDC);
- DeleteObject(hMemBM);
- };
- break;
- };
- // if the delay time is too short (like in old GIFs), wait for 100ms
- if (m_arrFrames[nTemp].m_nDelay < 5)
- WaitForSingleObject(m_hExitEvent, 100);
- else
- WaitForSingleObject(m_hExitEvent, 10*m_arrFrames[nTemp].m_nDelay);
- if (m_bExitThread)
- {
- if (hMemDC)
- {
- // dispose local variables
- SelectObject(hMemDC,hOldBM);
- DeleteDC(hMemDC);
- DeleteObject(hMemBM);
- };
- break;
- };
- // disposal method #2
- if (m_arrFrames[nTemp].m_nDisposal == 2)
- {
- HBRUSH hBrush = CreateSolidBrush(m_clrBackground);
- if (hBrush)
- {
- RECT rect = {
- m_arrFrames[nTemp].m_frameOffset.cx,
- m_arrFrames[nTemp].m_frameOffset.cy,
- m_arrFrames[nTemp].m_frameOffset.cx + m_arrFrames[nTemp].m_frameSize.cx,
- m_arrFrames[nTemp].m_frameOffset.cy + m_arrFrames[nTemp].m_frameSize.cy };
- FillRect(m_hMemDC,&rect,hBrush);
- DeleteObject(hBrush);
- };
- }
- else
- if (hMemDC && (m_arrFrames[nTemp].m_nDisposal == 3) )
- {
- // put it back
- BitBlt(m_hMemDC,
- m_arrFrames[nTemp].m_frameOffset.cx,
- m_arrFrames[nTemp].m_frameOffset.cy,
- m_arrFrames[nTemp].m_frameSize.cx,
- m_arrFrames[nTemp].m_frameSize.cy,
- hMemDC,0,0, SRCCOPY);
- // dispose local variables
- SelectObject(hMemDC,hOldBM);
- DeleteDC(hMemDC);
- DeleteObject(hMemBM);
- };
- };
- nTemp++;
- if (nTemp == m_arrFrames.size())
- {
- nTemp = 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_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));
- }
- 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
-
- ::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));
- 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 %sn"),szFileName);
- return;
- };
- char *pData = reinterpret_cast<char *> (GlobalLock(hData));
- if (!pData)
- {
- TRACE(_T("WriteData: Error locking memoryn"));
- return;
- };
- TRY
- {
- file.Write(pData,dwSize);
- }
- CATCH(CFileException, e);
- {
- TRACE(_T("WriteData: An exception occured while writing to the file %sn"),
- szFileName);
- //e->Delete(); // DO NOT CALL THIS, CAN CAUSE CRASH. majun, 7.31
- 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 blockn"));
- return;
- break;
- case BLOCK_TRAILER:
- TRACE(_T("- Trailer blockn"));
- break;
- case BLOCK_APPEXT:
- TRACE(_T("- Application extension blockn"));
- break;
- case BLOCK_COMMEXT:
- TRACE(_T("- Comment extension blockn"));
- 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 blockn"));
- 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