include/wx/msw/gdiimage.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 licence
  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 #include "wx/gdiobj.h"          // base class
  20 #include "wx/gdicmn.h"          // wxBITMAP_TYPE_INVALID
  21 #include "wx/list.h"
  22
  23 class WXDLLIMPEXP_FWD_CORE wxGDIImageRefData;
  24 class WXDLLIMPEXP_FWD_CORE wxGDIImageHandler;
  25 class WXDLLIMPEXP_FWD_CORE wxGDIImage;
  26
  27 WX_DECLARE_EXPORTED_LIST(wxGDIImageHandler, wxGDIImageHandlerList);
  28
  29 // ----------------------------------------------------------------------------
  30 // wxGDIImageRefData: common data fields for all derived classes
  31 // ----------------------------------------------------------------------------
  32
  33 class WXDLLIMPEXP_CORE wxGDIImageRefData : public wxGDIRefData
  34 {
  35 public:
  36     wxGDIImageRefData()
  37     {
  38         m_width = m_height = m_depth = 0;
  39
  40         m_handle = 0;
  41     }
  42
  43     wxGDIImageRefData(const wxGDIImageRefData& data) : wxGDIRefData(data)
  44     {
  45         m_width = data.m_width;
  46         m_height = data.m_height;
  47         m_depth = data.m_depth;
  48
  49         // can't copy handles like this, derived class copy ctor must do it!
  50         m_handle = NULL;
  51     }
  52
  53     // accessors
  54     virtual bool IsOk() const { return m_handle != 0; }
  55
  56     void SetSize(int w, int h) { m_width = w; m_height = h; }
  57
  58     // free the ressources we allocated
  59     virtual void Free() = 0;
  60
  61     // for compatibility, the member fields are public
  62
  63     // the size of the image
  64     int m_width, m_height;
  65
  66     // the depth of the image
  67     int m_depth;
  68
  69     // the handle to it
  70     union
  71     {
  72         WXHANDLE  m_handle;     // for untyped access
  73         WXHBITMAP m_hBitmap;
  74         WXHICON   m_hIcon;
  75         WXHCURSOR m_hCursor;
  76     };
  77 };
  78
  79 // ----------------------------------------------------------------------------
  80 // wxGDIImage: this class supports GDI image handlers which may be registered
  81 // dynamically and will be used for loading/saving the images in the specified
  82 // format. It also falls back to wxImage if no appropriate image is found.
  83 // ----------------------------------------------------------------------------
  84
  85 class WXDLLIMPEXP_CORE wxGDIImage : public wxGDIObject
  86 {
  87 public:
  88     // handlers list interface
  89     static wxGDIImageHandlerList& GetHandlers() { return ms_handlers; }
  90
  91     static void AddHandler(wxGDIImageHandler *handler);
  92     static void InsertHandler(wxGDIImageHandler *handler);
  93     static bool RemoveHandler(const wxString& name);
  94
  95     static wxGDIImageHandler *FindHandler(const wxString& name);
  96     static wxGDIImageHandler *FindHandler(const wxString& extension, long type);
  97     static wxGDIImageHandler *FindHandler(long type);
  98
  99     static void InitStandardHandlers();
 100     static void CleanUpHandlers();
 101
 102     // access to the ref data casted to the right type
 103     wxGDIImageRefData *GetGDIImageData() const
 104         { return (wxGDIImageRefData *)m_refData; }
 105
 106     // accessors
 107     WXHANDLE GetHandle() const
 108         { return IsNull() ? 0 : GetGDIImageData()->m_handle; }
 109     void SetHandle(WXHANDLE handle)
 110         { AllocExclusive(); GetGDIImageData()->m_handle = handle; }
 111
 112     int GetWidth() const { return IsNull() ? 0 : GetGDIImageData()->m_width; }
 113     int GetHeight() const { return IsNull() ? 0 : GetGDIImageData()->m_height; }
 114     int GetDepth() const { return IsNull() ? 0 : GetGDIImageData()->m_depth; }
 115
 116     wxSize GetSize() const
 117     {
 118         return IsNull() ? wxSize(0,0) :
 119                wxSize(GetGDIImageData()->m_width, GetGDIImageData()->m_height);
 120     }
 121
 122     void SetWidth(int w) { AllocExclusive(); GetGDIImageData()->m_width = w; }
 123     void SetHeight(int h) { AllocExclusive(); GetGDIImageData()->m_height = h; }
 124     void SetDepth(int d) { AllocExclusive(); GetGDIImageData()->m_depth = d; }
 125
 126     void SetSize(int w, int h)
 127     {
 128         AllocExclusive();
 129         GetGDIImageData()->SetSize(w, h);
 130     }
 131     void SetSize(const wxSize& size) { SetSize(size.x, size.y); }
 132
 133     // forward some of base class virtuals to wxGDIImageRefData
 134     bool FreeResource(bool force = false);
 135     virtual WXHANDLE GetResourceHandle() const;
 136
 137 protected:
 138     // create the data for the derived class here
 139     virtual wxGDIImageRefData *CreateData() const = 0;
 140
 141     // implement the wxGDIObject method in terms of our, more specific, one
 142     virtual wxGDIRefData *CreateGDIRefData() const { return CreateData(); }
 143
 144     // we can't [efficiently] clone objects of this class
 145     virtual wxGDIRefData *
 146     CloneGDIRefData(const wxGDIRefData *WXUNUSED(data)) const
 147     {
 148         wxFAIL_MSG( wxT("must be implemented if used") );
 149
 150         return NULL;
 151     }
 152
 153     static wxGDIImageHandlerList ms_handlers;
 154 };
 155
 156 // ----------------------------------------------------------------------------
 157 // wxGDIImageHandler: a class which knows how to load/save wxGDIImages.
 158 // ----------------------------------------------------------------------------
 159
 160 class WXDLLIMPEXP_CORE wxGDIImageHandler : public wxObject
 161 {
 162 public:
 163     // ctor
 164     wxGDIImageHandler() { m_type = wxBITMAP_TYPE_INVALID; }
 165     wxGDIImageHandler(const wxString& name,
 166                       const wxString& ext,
 167                       wxBitmapType type)
 168         : m_name(name), m_extension(ext), m_type(type) { }
 169
 170     // accessors
 171     void SetName(const wxString& name) { m_name = name; }
 172     void SetExtension(const wxString& ext) { m_extension = ext; }
 173     void SetType(wxBitmapType type) { m_type = type; }
 174
 175     const wxString& GetName() const { return m_name; }
 176     const wxString& GetExtension() const { return m_extension; }
 177     wxBitmapType GetType() const { return m_type; }
 178
 179     // real handler operations: to implement in derived classes
 180     virtual bool Create(wxGDIImage *image,
 181                         const void* data,
 182                         wxBitmapType flags,
 183                         int width, int height, int depth = 1) = 0;
 184     virtual bool Load(wxGDIImage *image,
 185                       const wxString& name,
 186                       wxBitmapType flags,
 187                       int desiredWidth, int desiredHeight) = 0;
 188     virtual bool Save(const wxGDIImage *image,
 189                       const wxString& name,
 190                       wxBitmapType type) const = 0;
 191
 192 protected:
 193     wxString  m_name;
 194     wxString  m_extension;
 195     wxBitmapType m_type;
 196 };
 197
 198 #endif // _WX_MSW_GDIIMAGE_H_