include/wx/palmos/gdiimage.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/palmos/gdiimage.h
   3 // Purpose:     wxGDIImage class: base class for wxBitmap, wxIcon, wxCursor
   4 //              under Palm OS
   5 // Author:      William Osborne - minimal working wxPalmOS port
   6 // Modified by: Yunhui Fu
   7 // Created:     10/13/04
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) William Osborne
  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_PALMOS_GDIIMAGE_H_
  17 #define _WX_PALMOS_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     // accessors
  44     virtual bool IsOk() const { return m_handle != 0; }
  45
  46     void SetSize(int w, int h) { m_width = w; m_height = h; }
  47
  48     // free the ressources we allocated
  49     virtual void Free() = 0;
  50
  51     // for compatibility, the member fields are public
  52
  53     // the size of the image
  54     int m_width, m_height;
  55
  56     // the depth of the image
  57     int m_depth;
  58
  59     // the handle to it
  60     union
  61     {
  62         WXHANDLE  m_handle;     // for untyped access
  63         WXHBITMAP m_hBitmap;
  64         WXHICON   m_hIcon;
  65         WXHCURSOR m_hCursor;
  66     };
  67 };
  68
  69 // ----------------------------------------------------------------------------
  70 // wxGDIImageHandler: a class which knows how to load/save wxGDIImages.
  71 // ----------------------------------------------------------------------------
  72
  73 class WXDLLIMPEXP_CORE wxGDIImageHandler : public wxObject
  74 {
  75 public:
  76     // ctor
  77     wxGDIImageHandler() { m_type = wxBITMAP_TYPE_INVALID; }
  78     wxGDIImageHandler(const wxString& name,
  79                       const wxString& ext,
  80                       long type)
  81         : m_name(name), m_extension(ext)
  82     {
  83         m_type = type;
  84     }
  85
  86     // accessors
  87     void SetName(const wxString& name) { m_name = name; }
  88     void SetExtension(const wxString& ext) { m_extension = ext; }
  89     void SetType(long type) { m_type = type; }
  90
  91     wxString GetName() const { return m_name; }
  92     wxString GetExtension() const { return m_extension; }
  93     long GetType() const { return m_type; }
  94
  95     // real handler operations: to implement in derived classes
  96     virtual bool Create(wxGDIImage *image,
  97                         const void* data,
  98                         long flags,
  99                         int width, int height, int depth = 1) = 0;
 100     virtual bool Load(wxGDIImage *image,
 101                       const wxString& name,
 102                       long flags,
 103                       int desiredWidth, int desiredHeight) = 0;
 104     virtual bool Save(wxGDIImage *image,
 105                       const wxString& name,
 106                       int type) = 0;
 107
 108 protected:
 109     wxString  m_name;
 110     wxString  m_extension;
 111     long      m_type;
 112 };
 113
 114 // ----------------------------------------------------------------------------
 115 // wxGDIImage: this class supports GDI image handlers which may be registered
 116 // dynamically and will be used for loading/saving the images in the specified
 117 // format. It also falls back to wxImage if no appropriate image is found.
 118 // ----------------------------------------------------------------------------
 119
 120 class WXDLLIMPEXP_CORE wxGDIImage : public wxGDIObject
 121 {
 122 public:
 123     // handlers list interface
 124     static wxGDIImageHandlerList& GetHandlers() { return ms_handlers; }
 125
 126     static void AddHandler(wxGDIImageHandler *handler);
 127     static void InsertHandler(wxGDIImageHandler *handler);
 128     static bool RemoveHandler(const wxString& name);
 129
 130     static wxGDIImageHandler *FindHandler(const wxString& name);
 131     static wxGDIImageHandler *FindHandler(const wxString& extension, long type);
 132     static wxGDIImageHandler *FindHandler(long type);
 133
 134     static void InitStandardHandlers();
 135     static void CleanUpHandlers();
 136
 137     // access to the ref data casted to the right type
 138     wxGDIImageRefData *GetGDIImageData() const
 139         { return (wxGDIImageRefData *)m_refData; }
 140
 141     // create data if we don't have it yet
 142     void EnsureHasData() { if ( IsNull() ) m_refData = CreateData(); }
 143
 144     // accessors
 145     WXHANDLE GetHandle() const
 146         { return IsNull() ? 0 : GetGDIImageData()->m_handle; }
 147     void SetHandle(WXHANDLE handle)
 148         { EnsureHasData(); GetGDIImageData()->m_handle = handle; }
 149
 150     int GetWidth() const { return IsNull() ? 0 : GetGDIImageData()->m_width; }
 151     int GetHeight() const { return IsNull() ? 0 : GetGDIImageData()->m_height; }
 152     int GetDepth() const { return IsNull() ? 0 : GetGDIImageData()->m_depth; }
 153
 154     void SetWidth(int w) { EnsureHasData(); GetGDIImageData()->m_width = w; }
 155     void SetHeight(int h) { EnsureHasData(); GetGDIImageData()->m_height = h; }
 156     void SetDepth(int d) { EnsureHasData(); GetGDIImageData()->m_depth = d; }
 157
 158     void SetSize(int w, int h)
 159     {
 160         EnsureHasData();
 161         GetGDIImageData()->SetSize(w, h);
 162     }
 163     void SetSize(const wxSize& size) { SetSize(size.x, size.y); }
 164
 165     // forward some of base class virtuals to wxGDIImageRefData
 166     bool FreeResource(bool force = FALSE);
 167     virtual WXHANDLE GetResourceHandle() const;
 168
 169 protected:
 170     // create the data for the derived class here
 171     virtual wxGDIImageRefData *CreateData() const = 0;
 172     virtual wxGDIRefData *CreateGDIRefData() const { return CreateData(); }
 173     // we can't [efficiently] clone objects of this class
 174     virtual wxGDIRefData *
 175     CloneGDIRefData(const wxGDIRefData *WXUNUSED(data)) const
 176     {
 177         wxFAIL_MSG( _T("must be implemented if used") );
 178
 179         return NULL;
 180     }
 181
 182     static wxGDIImageHandlerList ms_handlers;
 183 };
 184
 185 #endif // _WX_PALMOS_GDIIMAGE_H_