C++ wxInputStream::TellI方法代码示例

 wxFileOffset TellI() const
     { wxASSERT(m_pStream); return m_pStream->TellI(); }

//.........这里部分代码省略.........
            gmask = 0x03E0;
            bmask = 0x001F;
            rshift = 10;
            gshift = 5;
            bshift = 0;
            rbits = 5;
            gbits = 5;
            bbits = 5;
        }
        else if ( bpp == 32 )
        {
            rmask = 0x00FF0000;
            gmask = 0x0000FF00;
            bmask = 0x000000FF;
            amask = 0xFF000000;

            ashift = 24;
            rshift = 16;
            gshift = 8;
            bshift = 0;
            rbits = 8;
            gbits = 8;
            bbits = 8;
        }
    }

    /*
     * Reading the image data
     */
    if ( IsBmp )
    {
        // NOTE: seeking a positive amount in wxFromCurrent mode allows us to
        //       load even non-seekable streams (see wxInputStream::SeekI docs)!
        const wxFileOffset pos = stream.TellI();
        if (pos != wxInvalidOffset && bmpOffset > pos)
            if (stream.SeekI(bmpOffset - pos, wxFromCurrent) == wxInvalidOffset)
                return false;
        //else: icon, just carry on
    }

    unsigned char *data = ptr;

    /* set the whole image to the background color */
    if ( bpp < 16 && (comp == BI_RLE4 || comp == BI_RLE8) )
    {
        for (int i = 0; i < width * height; i++)
        {
            *ptr++ = cmap[0].r;
            *ptr++ = cmap[0].g;
            *ptr++ = cmap[0].b;
        }
        ptr = data;
    }

    int linesize = ((width * bpp + 31) / 32) * 4;

    /* BMPs are stored upside down */
    for ( int line = (height - 1); line >= 0; line-- )
    {
        int linepos = 0;
        for ( int column = 0; column < width ; )
        {
            if ( bpp < 16 )
            {
                linepos++;
                aByte = stream.GetC();

// load the mxf file format
bool wxMXFHandler::LoadFile(wxImage *image, wxInputStream& stream, bool verbose, int index)
{
	opj_dparameters_t parameters;	/* decompression parameters */
	opj_event_mgr_t event_mgr;		/* event manager */
	opj_image_t *opjimage = NULL;
	unsigned char *src = NULL;
    unsigned char *ptr;
	int file_length, j2k_point, j2k_len;
	opj_codestream_info_t cstr_info;  /* Codestream information structure */

	// destroy the image
    image->Destroy();

	/* handle to a decompressor */
	opj_dinfo_t* dinfo = NULL;	
	opj_cio_t *cio = NULL;

	/* configure the event callbacks (not required) */
	memset(&event_mgr, 0, sizeof(opj_event_mgr_t));
	event_mgr.error_handler = mxf_error_callback;
	event_mgr.warning_handler = mxf_warning_callback;
	event_mgr.info_handler = mxf_info_callback;

	/* set decoding parameters to default values */
	opj_set_default_decoder_parameters(&parameters);

	/* prepare parameters */
	strncpy(parameters.infile, "", sizeof(parameters.infile)-1);
	strncpy(parameters.outfile, "", sizeof(parameters.outfile)-1);
	parameters.decod_format = J2K_CFMT;
	parameters.cod_format = BMP_DFMT;
	if (m_reducefactor)
		parameters.cp_reduce = m_reducefactor;
	if (m_qualitylayers)
		parameters.cp_layer = m_qualitylayers;
	/*if (n_components)
		parameters. = n_components;*/

	/* JPWL only */
#ifdef USE_JPWL
	parameters.jpwl_exp_comps = m_expcomps;
	parameters.jpwl_max_tiles = m_maxtiles;
	parameters.jpwl_correct = m_enablejpwl;
#endif /* USE_JPWL */

	/* get a decoder handle */
	dinfo = opj_create_decompress(CODEC_J2K);

	/* find length of the stream */
	stream.SeekI(0, wxFromEnd);
	file_length = (int) stream.TellI();

	/* search for the m_framenum codestream position and length  */
	//jp2c_point = searchjp2c(stream, file_length, m_framenum);
	//jp2c_len = searchjp2c(stream, file_length, m_framenum);
	j2k_point = 0;
	j2k_len = 10;

	// malloc memory source
    src = (unsigned char *) malloc(j2k_len);

	// copy the jp2c
	stream.SeekI(j2k_point, wxFromStart);
	stream.Read(src, j2k_len);

	/* catch events using our callbacks and give a local context */
	opj_set_event_mgr((opj_common_ptr)dinfo, &event_mgr, stderr);

	/* setup the decoder decoding parameters using user parameters */
	opj_setup_decoder(dinfo, &parameters);

	/* open a byte stream */
	cio = opj_cio_open((opj_common_ptr)dinfo, src, j2k_len);

	/* decode the stream and fill the image structure */
	opjimage = opj_decode_with_info(dinfo, cio, &cstr_info);
	if (!opjimage) {
		wxMutexGuiEnter();
		wxLogError(wxT("MXF: failed to decode image!"));
		wxMutexGuiLeave();
		opj_destroy_decompress(dinfo);
		opj_cio_close(cio);
		free(src);
		return false;
	}

	/* close the byte stream */
	opj_cio_close(cio);

	/* common rendering method */
#include "imagjpeg2000.cpp"

    wxMutexGuiEnter();
    wxLogMessage(wxT("MXF: image loaded."));
    wxMutexGuiLeave();

	/* close openjpeg structs */
	opj_destroy_decompress(dinfo);
	opj_image_destroy(opjimage);
//.........这里部分代码省略.........

// load the jpeg2000 file format
bool wxJPEG2000Handler::LoadFile(wxImage *image, wxInputStream& stream, bool verbose, int index)
{
	opj_dparameters_t parameters;	/* decompression parameters */
	opj_event_mgr_t event_mgr;		/* event manager */
	opj_image_t *opjimage = NULL;
	unsigned char *src = NULL;
    unsigned char *ptr;
	int file_length, jp2c_point, jp2h_point;
	unsigned long int jp2hboxlen, jp2cboxlen;
	opj_codestream_info_t cstr_info;  /* Codestream information structure */
    unsigned char hdr[24];
	int jpfamform;

	// destroy the image
    image->Destroy();

	/* read the beginning of the file to check the type */ 
    if (!stream.Read(hdr, WXSIZEOF(hdr)))
        return false;
	if ((jpfamform = jpeg2000familytype(hdr, WXSIZEOF(hdr))) < 0)
		return false;
	stream.SeekI(0, wxFromStart);

	/* handle to a decompressor */
	opj_dinfo_t* dinfo = NULL;	
	opj_cio_t *cio = NULL;

	/* configure the event callbacks */
	memset(&event_mgr, 0, sizeof(opj_event_mgr_t));
	event_mgr.error_handler = jpeg2000_error_callback;
	event_mgr.warning_handler = jpeg2000_warning_callback;
	event_mgr.info_handler = jpeg2000_info_callback;

	/* set decoding parameters to default values */
	opj_set_default_decoder_parameters(&parameters);

	/* prepare parameters */
	strncpy(parameters.infile, "", sizeof(parameters.infile) - 1);
	strncpy(parameters.outfile, "", sizeof(parameters.outfile) - 1);
	parameters.decod_format = jpfamform;
	parameters.cod_format = BMP_DFMT;
	if (m_reducefactor)
		parameters.cp_reduce = m_reducefactor;
	if (m_qualitylayers)
		parameters.cp_layer = m_qualitylayers;
	/*if (n_components)
		parameters. = n_components;*/

	/* JPWL only */
#ifdef USE_JPWL
	parameters.jpwl_exp_comps = m_expcomps;
	parameters.jpwl_max_tiles = m_maxtiles;
	parameters.jpwl_correct = m_enablejpwl;
#endif /* USE_JPWL */

	/* get a decoder handle */
	if (jpfamform == JP2_CFMT || jpfamform == MJ2_CFMT)
		dinfo = opj_create_decompress(CODEC_JP2);
	else if (jpfamform == J2K_CFMT)
		dinfo = opj_create_decompress(CODEC_J2K);
	else
		return false;

	/* find length of the stream */
	stream.SeekI(0, wxFromEnd);
	file_length = (int) stream.TellI();

	/* it's a movie */
	if (jpfamform == MJ2_CFMT) {
		/* search for the first codestream box and the movie header box  */
		jp2c_point = searchjpeg2000c(stream, file_length, m_framenum);
		jp2h_point = searchjpeg2000headerbox(stream, file_length);

		// read the jp2h box and store it
		stream.SeekI(jp2h_point, wxFromStart);
		stream.Read(&jp2hboxlen, sizeof(unsigned long int));
		jp2hboxlen = BYTE_SWAP4(jp2hboxlen);

		// read the jp2c box and store it
		stream.SeekI(jp2c_point, wxFromStart);
		stream.Read(&jp2cboxlen, sizeof(unsigned long int));
		jp2cboxlen = BYTE_SWAP4(jp2cboxlen);

		// malloc memory source
		src = (unsigned char *) malloc(jpeg2000headSIZE + jp2hboxlen + jp2cboxlen);

		// copy the jP and ftyp
		memcpy(src, jpeg2000head, jpeg2000headSIZE);

		// copy the jp2h
		stream.SeekI(jp2h_point, wxFromStart);
		stream.Read(&src[jpeg2000headSIZE], jp2hboxlen);

		// copy the jp2c
		stream.SeekI(jp2c_point, wxFromStart);
		stream.Read(&src[jpeg2000headSIZE + jp2hboxlen], jp2cboxlen);
	} else 	if (jpfamform == JP2_CFMT || jpfamform == J2K_CFMT) {
		/* It's a plain image */
		/* get data */
//.........这里部分代码省略.........

// read callstacks
void Database::loadProcList(wxInputStream &file,bool collapseKernelCalls)
{
    wxTextInputStream str(file);

    wxProgressDialog progressdlg("Sleepy", "Please wait while the profile database is scanned...",
                                 (int)file.GetSize(), theMainWin,
                                 wxPD_APP_MODAL|wxPD_AUTO_HIDE);

    class CallStackPtrComp
    {
        CallStack *p;
    public:
        CallStackPtrComp(CallStack *_p): p(_p) {}
        bool operator <(const CallStackPtrComp b) const {
            return p->stack < b.p->stack;
        }
        CallStack *Get() {
            return p;
        }
    };

    std::set<CallStackPtrComp> callstackSet;

    while(!file.Eof())
    {
        wxString line = str.ReadLine();
        if (line.IsEmpty())
            break;

        std::wistringstream stream(line.c_str().AsWChar());

        CallStack callstack;
        stream >> callstack.samplecount;

        while(true)
        {
            std::wstring id;
            stream >> id;
            if (id.empty())
                break;

            const Symbol *sym = symbols[id];

            if(collapseKernelCalls && sym->isCollapseFunction) {
                callstack.stack.clear();
            }

            callstack.stack.push_back(sym);
        }

        if(collapseKernelCalls) {
            if(callstack.stack.size() && callstack.stack[0]->isCollapseModule) {
                while(callstack.stack.size() >= 2) {
                    if(	!callstack.stack[1]->isCollapseModule )
                    {
                        break;
                    }
                    callstack.stack.erase(callstack.stack.begin());
                }
            }
        }

        std::set<CallStackPtrComp>::iterator iter = callstackSet.find(&callstack);
        if(iter != callstackSet.end()) {
            ((CallStackPtrComp)*iter).Get()->samplecount += callstack.samplecount;
            continue;
        }
        callstacks.push_back(callstack);
        callstackSet.insert(&callstacks[callstacks.size()-1]);

        wxFileOffset offset = file.TellI();
        if(offset != wxInvalidOffset)
            progressdlg.Update(offset);
    }
}