gdiimage.cpp

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///////////////////////////////////////////////////////////////////////////////
// Name:        msw/gdiimage.cpp
// Purpose:     wxGDIImage implementation
// Author:      Vadim Zeitlin
// Modified by:
// Created:     20.11.99
// RCS-ID:      $Id: gdiimage.cpp,v 1.50 2005/07/01 13:38:58 ABX Exp $
// Copyright:   (c) 1999 Vadim Zeitlin <[e-mail]>
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
    #pragma implementation "gdiimage.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#ifndef WX_PRECOMP
    #include "wx/string.h"
    #include "wx/log.h"
#endif // WX_PRECOMP

#include "wx/msw/private.h"

#include "wx/app.h"

#include "wx/bitmap.h"
#include "wx/msw/gdiimage.h"

#if wxUSE_WXDIB
#include "wx/msw/dib.h"
#endif

#ifdef __WXWINCE__
#include <winreg.h>
#include <shellapi.h>
#endif

#include "wx/file.h"

#include "wx/listimpl.cpp"
WX_DEFINE_LIST(wxGDIImageHandlerList);

// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------

#ifndef __WXMICROWIN__

// all image handlers are declared/defined in this file because the outside
// world doesn't have to know about them (but only about wxBITMAP_TYPE_XXX ids)

class WXDLLEXPORT wxBMPFileHandler : public wxBitmapHandler
{
public:
    wxBMPFileHandler() : wxBitmapHandler(_T("Windows bitmap file"), _T("bmp"),
                                         wxBITMAP_TYPE_BMP)
    {
    }

    virtual bool LoadFile(wxBitmap *bitmap,
                          const wxString& name, long flags,
                          int desiredWidth, int desiredHeight);
    virtual bool SaveFile(wxBitmap *bitmap,
                          const wxString& name, int type,
                          const wxPalette *palette = NULL);

private:
    DECLARE_DYNAMIC_CLASS(wxBMPFileHandler)
};

class WXDLLEXPORT wxBMPResourceHandler: public wxBitmapHandler
{
public:
    wxBMPResourceHandler() : wxBitmapHandler(_T("Windows bitmap resource"),
                                             wxEmptyString,
                                             wxBITMAP_TYPE_BMP_RESOURCE)
    {
    }

    virtual bool LoadFile(wxBitmap *bitmap,
                          const wxString& name, long flags,
                          int desiredWidth, int desiredHeight);

private:
    DECLARE_DYNAMIC_CLASS(wxBMPResourceHandler)
};

class WXDLLEXPORT wxIconHandler : public wxGDIImageHandler
{
public:
    wxIconHandler(const wxString& name, const wxString& ext, long type)
        : wxGDIImageHandler(name, ext, type)
    {
    }

    // creating and saving icons is not supported
    virtual bool Create(wxGDIImage *WXUNUSED(image),
                        void *WXUNUSED(data),
                        long WXUNUSED(flags),
                        int WXUNUSED(width),
                        int WXUNUSED(height),
                        int WXUNUSED(depth) = 1)
    {
        return false;
    }

    virtual bool Save(wxGDIImage *WXUNUSED(image),
                      const wxString& WXUNUSED(name),
                      int WXUNUSED(type))
    {
        return false;
    }

    virtual bool Load(wxGDIImage *image,
                      const wxString& name,
                      long flags,
                      int desiredWidth, int desiredHeight)
    {
        wxIcon *icon = wxDynamicCast(image, wxIcon);
        wxCHECK_MSG( icon, false, _T("wxIconHandler only works with icons") );

        return LoadIcon(icon, name, flags, desiredWidth, desiredHeight);
    }

protected:
    virtual bool LoadIcon(wxIcon *icon,
                          const wxString& name, long flags,
                          int desiredWidth = -1, int desiredHeight = -1) = 0;
};

class WXDLLEXPORT wxICOFileHandler : public wxIconHandler
{
public:
    wxICOFileHandler() : wxIconHandler(_T("ICO icon file"),
                                       _T("ico"),
                                       wxBITMAP_TYPE_ICO)
    {
    }

protected:
    virtual bool LoadIcon(wxIcon *icon,
                          const wxString& name, long flags,
                          int desiredWidth = -1, int desiredHeight = -1);

private:
    DECLARE_DYNAMIC_CLASS(wxICOFileHandler)
};

class WXDLLEXPORT wxICOResourceHandler: public wxIconHandler
{
public:
    wxICOResourceHandler() : wxIconHandler(_T("ICO resource"),
                                           _T("ico"),
                                           wxBITMAP_TYPE_ICO_RESOURCE)
    {
    }

protected:
    virtual bool LoadIcon(wxIcon *icon,
                          const wxString& name, long flags,
                          int desiredWidth = -1, int desiredHeight = -1);

private:
    DECLARE_DYNAMIC_CLASS(wxICOResourceHandler)
};

// ----------------------------------------------------------------------------
// wxWin macros
// ----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxBMPFileHandler, wxBitmapHandler)
IMPLEMENT_DYNAMIC_CLASS(wxBMPResourceHandler, wxBitmapHandler)
IMPLEMENT_DYNAMIC_CLASS(wxICOFileHandler, wxObject)
IMPLEMENT_DYNAMIC_CLASS(wxICOResourceHandler, wxObject)

// ----------------------------------------------------------------------------
// private functions
// ----------------------------------------------------------------------------

#endif
    // __MICROWIN__

// ============================================================================
// implementation
// ============================================================================

wxGDIImageHandlerList wxGDIImage::ms_handlers;

// ----------------------------------------------------------------------------
// wxGDIImage functions forwarded to wxGDIImageRefData
// ----------------------------------------------------------------------------

bool wxGDIImage::FreeResource(bool WXUNUSED(force))
{
    if ( !IsNull() )
    {
        GetGDIImageData()->Free();
        GetGDIImageData()->m_handle = 0;
    }

    return true;
}

WXHANDLE wxGDIImage::GetResourceHandle() const
{
    return GetHandle();
}

// ----------------------------------------------------------------------------
// wxGDIImage handler stuff
// ----------------------------------------------------------------------------

void wxGDIImage::AddHandler(wxGDIImageHandler *handler)
{
    ms_handlers.Append(handler);
}

void wxGDIImage::InsertHandler(wxGDIImageHandler *handler)
{
    ms_handlers.Insert(handler);
}

bool wxGDIImage::RemoveHandler(const wxString& name)
{
    wxGDIImageHandler *handler = FindHandler(name);
    if ( handler )
    {
        ms_handlers.DeleteObject(handler);
        return true;
    }
    else
        return false;
}

wxGDIImageHandler *wxGDIImage::FindHandler(const wxString& name)
{
    wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
    while ( node )
    {
        wxGDIImageHandler *handler = node->GetData();
        if ( handler->GetName() == name )
            return handler;
        node = node->GetNext();
    }

    return NULL;
}

wxGDIImageHandler *wxGDIImage::FindHandler(const wxString& extension,
                                           long type)
{
    wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
    while ( node )
    {
        wxGDIImageHandler *handler = node->GetData();
        if ( (handler->GetExtension() == extension) &&
             (type == -1 || handler->GetType() == type) )
        {
            return handler;
        }

        node = node->GetNext();
    }
    return NULL;
}

wxGDIImageHandler *wxGDIImage::FindHandler(long type)
{
    wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
    while ( node )
    {
        wxGDIImageHandler *handler = node->GetData();
        if ( handler->GetType() == type )
            return handler;

        node = node->GetNext();
    }

    return NULL;
}

void wxGDIImage::CleanUpHandlers()
{
    wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
    while ( node )
    {
        wxGDIImageHandler *handler = node->GetData();
        wxGDIImageHandlerList::compatibility_iterator next = node->GetNext();
        delete handler;
        ms_handlers.Erase( node );
        node = next;
    }