PictureEx.cpp+.h

#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); }