6319afe332
Added a better Peek() to wxBufferedInputStream Fixed wxPNMHandler (it is a lot faster on text PNM now) Image sample loads a PNM git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3525 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
162 lines
3.8 KiB
C++
162 lines
3.8 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: imagpnm.cpp
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// Purpose: wxImage PNM handler
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// Author: Sylvain Bougnoux
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// RCS-ID: $Id$
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// Copyright: (c) Sylvain Bougnoux
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/*
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We don't put pragma implement in this file because it is already present in
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src/common/image.cpp
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*/
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#include "wx/image.h"
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#include "wx/log.h"
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#include "wx/txtstrm.h"
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#ifdef __WXMSW__
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#include <windows.h>
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#endif
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//-----------------------------------------------------------------------------
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// wxBMPHandler
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//-----------------------------------------------------------------------------
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#if !USE_SHARED_LIBRARIES
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IMPLEMENT_DYNAMIC_CLASS(wxPNMHandler,wxImageHandler)
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#endif
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#if wxUSE_STREAMS
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//#include <stream.h> // for cout
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void Skip_Comment(wxInputStream &stream)
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{
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wxString line;
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wxTextInputStream text_stream(stream);
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if (stream.Peek()==_T('#'))
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{
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text_stream >> line;
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Skip_Comment(stream);
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}
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}
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bool wxPNMHandler::LoadFile( wxImage *image, wxInputStream& stream, bool WXUNUSED(verbose) )
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{
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wxUint32 width, height;
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wxUint16 maxval;
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wxString line;
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char c(0);
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image->Destroy();
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/*
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* Read the PNM header
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*/
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wxBufferedInputStream buf_stream(stream);
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wxTextInputStream text_stream(buf_stream);
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Skip_Comment(buf_stream);
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if (buf_stream.GetC()==_T('P')) c=buf_stream.GetC();
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switch (c)
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{
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case _T('2'):
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wxLogError(_T("Loading Grey Ascii PNM image is not yet implemented."));
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return FALSE;
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case _T('5'):
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wxLogError(_T("Loading Grey Raw PNM image is not yet implemented."));
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return FALSE;
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case _T('3'): case _T('6'): break;
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default :
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wxLogError(_T("Loading PNM image : file not recognized."));
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return FALSE;
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}
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text_stream >> line; // for the \n
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Skip_Comment(buf_stream);
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text_stream >> width >> height ;
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Skip_Comment(buf_stream);
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text_stream >> maxval;
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//cout << line << " " << width << " " << height << " " << maxval << endl;
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image->Create( width, height );
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unsigned char *ptr = image->GetData();
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if (!ptr)
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{
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wxLogError( _T("Cannot allocate RAM for RGB data in PNM file.") );
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return FALSE;
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}
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if (c=='3') // Ascii RBG
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{
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wxUint32 value, size=3*width*height;
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for (wxUint32 i=0; i<size; ++i)
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{
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//this is very slow !!!
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//I wonder how we can make any better ?
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value=text_stream.Read32();
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*ptr++=(unsigned char)value;
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if (buf_stream.LastError()!=wxSTREAM_NOERROR)
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{
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wxLogError(_T("Loading PNM image : file seems truncated."));
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return FALSE;
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}
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}
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}
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if (c=='6') // Raw RGB
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buf_stream.Read( ptr, 3*width*height );
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image->SetMask( FALSE );
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return (buf_stream.LastError()==wxStream_NOERROR || buf_stream.LastError()==wxStream_EOF);
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}
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bool wxPNMHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool WXUNUSED(verbose) )
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{
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wxTextOutputStream text_stream(stream);
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//text_stream << "P6" << endl
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//<< image->GetWidth() << " " << image->GetHeight() << endl
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//<< "255" << endl;
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text_stream << "P6\n" << image->GetWidth() << " " << image->GetHeight() << "\n255\n";
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stream.Write(image->GetData(),3*image->GetWidth()*image->GetHeight());
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return (stream.LastError()==wxStream_NOERROR);
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}
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bool wxPNMHandler::CanRead( wxInputStream& stream )
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{
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off_t pos=stream.TellI();
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Skip_Comment(stream);
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if (stream.GetC()==_T('P'))
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switch (stream.GetC())
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{
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case _T('3'): case _T('6'):
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stream.SeekI(pos);
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return TRUE;
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}
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stream.SeekI(pos);
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return FALSE;
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}
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#endif // wxUSE_STREAMS
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