include/wx/msw/gdiimage.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        include/wx/msw/gdiimage.h
   3 // Purpose:     wxGDIImage class: base class for wxBitmap, wxIcon, wxCursor
   4 //              under MSW
   5 // Author:      Vadim Zeitlin
   6 // Modified by:
   7 // Created:     20.11.99
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) 1999 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
  10 // Licence:     wxWindows license
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 // NB: this is a private header, it is not intended to be directly included by
  14 //     user code (but may be included from other, public, wxWin headers
  15
  16 #ifndef _WX_MSW_GDIIMAGE_H_
  17 #define _WX_MSW_GDIIMAGE_H_
  18
  19 #ifdef __GNUG__
  20     #pragma interface "gdiimage.h"
  21 #endif
  22
  23 #include "wx/gdiobj.h"          // base class
  24 #include "wx/gdicmn.h"          // wxBITMAP_TYPE_INVALID
  25 #include "wx/list.h"
  26
  27 class WXDLLEXPORT wxGDIImageRefData;
  28 class WXDLLEXPORT wxGDIImageHandler;
  29 class WXDLLEXPORT wxGDIImage;
  30
  31 // ----------------------------------------------------------------------------
  32 // wxGDIImageRefData: common data fields for all derived classes
  33 // ----------------------------------------------------------------------------
  34
  35 class WXDLLEXPORT wxGDIImageRefData : public wxGDIRefData
  36 {
  37 public:
  38     wxGDIImageRefData()
  39     {
  40         m_width = m_height = m_depth = 0;
  41
  42         m_handle = 0;
  43
  44 #if WXWIN_COMPATIBILITY_2
  45         m_ok = FALSE;
  46 #endif // WXWIN_COMPATIBILITY_2
  47     }
  48
  49     // accessors
  50     bool IsOk() const { return m_handle != 0; }
  51
  52     void SetSize(int w, int h) { m_width = w; m_height = h; }
  53
  54     // free the ressources we allocated
  55     virtual void Free() = 0;
  56
  57     // for compatibility, the member fields are public
  58
  59     // the size of the image
  60     int m_width, m_height;
  61
  62     // the depth of the image
  63     int m_depth;
  64
  65     // the handle to it
  66     union
  67     {
  68         WXHANDLE  m_handle;     // for untyped access
  69         WXHBITMAP m_hBitmap;
  70         WXHICON   m_hIcon;
  71         WXHCURSOR m_hCursor;
  72     };
  73
  74     // this filed is redundant and using it is error prone but keep it for
  75     // backwards compatibility
  76 #if WXWIN_COMPATIBILITY_2
  77     void SetOk() { m_ok = m_handle != 0; }
  78
  79     bool          m_ok;
  80 #endif // WXWIN_COMPATIBILITY_2
  81 };
  82
  83 // ----------------------------------------------------------------------------
  84 // wxGDIImageHandler: a class which knows how to load/save wxGDIImages.
  85 // ----------------------------------------------------------------------------
  86
  87 class WXDLLEXPORT wxGDIImageHandler : public wxObject
  88 {
  89 public:
  90     // ctor
  91     wxGDIImageHandler() { m_type = wxBITMAP_TYPE_INVALID; }
  92     wxGDIImageHandler(const wxString& name,
  93                       const wxString& ext,
  94                       long type)
  95         : m_name(name), m_extension(ext)
  96     {
  97         m_type = type;
  98     }
  99
 100     // accessors
 101     void SetName(const wxString& name) { m_name = name; }
 102     void SetExtension(const wxString& ext) { m_extension = ext; }
 103     void SetType(long type) { m_type = type; }
 104
 105     wxString GetName() const { return m_name; }
 106     wxString GetExtension() const { return m_extension; }
 107     long GetType() const { return m_type; }
 108
 109     // real handler operations: to implement in derived classes
 110     virtual bool Create(wxGDIImage *image,
 111                         void *data,
 112                         long flags,
 113                         int width, int height, int depth = 1) = 0;
 114     virtual bool Load(wxGDIImage *image,
 115                       const wxString& name,
 116                       long flags,
 117                       int desiredWidth, int desiredHeight) = 0;
 118     virtual bool Save(wxGDIImage *image,
 119                       const wxString& name,
 120                       int type) = 0;
 121
 122 protected:
 123     wxString  m_name;
 124     wxString  m_extension;
 125     long      m_type;
 126 };
 127
 128 // ----------------------------------------------------------------------------
 129 // wxGDIImage: this class supports GDI image handlers which may be registered
 130 // dynamically and will be used for loading/saving the images in the specified
 131 // format. It also falls back to wxImage if no appropriate image is found.
 132 // ----------------------------------------------------------------------------
 133
 134 class WXDLLEXPORT wxGDIImage : public wxGDIObject
 135 {
 136 public:
 137     // handlers list interface
 138     static wxList& GetHandlers() { return ms_handlers; }
 139
 140     static void AddHandler(wxGDIImageHandler *handler);
 141     static void InsertHandler(wxGDIImageHandler *handler);
 142     static bool RemoveHandler(const wxString& name);
 143
 144     static wxGDIImageHandler *FindHandler(const wxString& name);
 145     static wxGDIImageHandler *FindHandler(const wxString& extension, long type);
 146     static wxGDIImageHandler *FindHandler(long type);
 147
 148     static void InitStandardHandlers();
 149     static void CleanUpHandlers();
 150
 151     // access to the ref data casted to the right type
 152     wxGDIImageRefData *GetGDIImageData() const
 153         { return (wxGDIImageRefData *)m_refData; }
 154
 155     // create data if we don't have it yet
 156     void EnsureHasData() { if ( IsNull() ) m_refData = CreateData(); }
 157
 158     // accessors
 159     WXHANDLE GetHandle() const
 160         { return IsNull() ? 0 : GetGDIImageData()->m_handle; }
 161     void SetHandle(WXHANDLE handle)
 162         { EnsureHasData(); GetGDIImageData()->m_handle = handle; }
 163
 164     bool Ok() const { return GetHandle() != 0; }
 165
 166     int GetWidth() const { return IsNull() ? 0 : GetGDIImageData()->m_width; }
 167     int GetHeight() const { return IsNull() ? 0 : GetGDIImageData()->m_height; }
 168     int GetDepth() const { return IsNull() ? 0 : GetGDIImageData()->m_depth; }
 169
 170     void SetWidth(int w) { EnsureHasData(); GetGDIImageData()->m_width = w; }
 171     void SetHeight(int h) { EnsureHasData(); GetGDIImageData()->m_height = h; }
 172     void SetDepth(int d) { EnsureHasData(); GetGDIImageData()->m_depth = d; }
 173
 174     void SetSize(int w, int h)
 175     {
 176         EnsureHasData();
 177         GetGDIImageData()->SetSize(w, h);
 178     }
 179     void SetSize(const wxSize& size) { SetSize(size.x, size.y); }
 180
 181     // forward some of base class virtuals to wxGDIImageRefData
 182     bool FreeResource(bool force = FALSE);
 183     virtual WXHANDLE GetResourceHandle();
 184
 185 protected:
 186     // create the data for the derived class here
 187     virtual wxGDIImageRefData *CreateData() const = 0;
 188
 189     static wxList ms_handlers;
 190 };
 191
 192 #endif // _WX_MSW_GDIIMAGE_H_