+class WXDLLEXPORT wxDIB
+{
+public:
+ // ctors and such
+ // --------------
+
+ // create an uninitialized DIB with the given width, height and depth (only
+ // 24 and 32 bpp DIBs are currently supported)
+ //
+ // after using this ctor, GetData() and GetHandle() may be used if IsOk()
+ // returns true
+ wxDIB(int width, int height, int depth)
+ { Init(); (void)Create(width, height, depth); }
+
+ // create a DIB from the DDB
+ wxDIB(const wxBitmap& bmp)
+ { Init(); (void)Create(bmp); }
+
+ // load a DIB from file (any depth is supoprted here unlike above)
+ //
+ // as above, use IsOk() to see if the bitmap was loaded successfully
+ wxDIB(const wxString& filename)
+ { Init(); (void)Load(filename); }
+
+ // same as the corresponding ctors but with return value
+ bool Create(int width, int height, int depth);
+ bool Create(const wxBitmap& bmp);
+ bool Load(const wxString& filename);
+
+ // dtor is not virtual, this class is not meant to be used polymorphically
+ ~wxDIB();
+
+
+ // operations
+ // ----------
+
+#ifndef __WXWINCE__
+ // create a bitmap compatiblr with the given HDC (or screen by default) and
+ // return its handle, the caller is responsible for freeing it (using
+ // DeleteObject())
+ HBITMAP CreateDDB(HDC hdc = 0) const;
+#endif // !__WXWINCE__
+
+ // get the handle from the DIB and reset it, i.e. this object won't destroy
+ // the DIB after this (but the caller should do it)
+ HBITMAP Detach() { HBITMAP hbmp = m_handle; m_handle = 0; return hbmp; }
+
+#if wxUSE_PALETTE
+ // create a palette for this DIB (always a trivial/default one for 24bpp)
+ wxPalette *CreatePalette() const;
+#endif // wxUSE_PALETTE
+
+ // save the DIB as a .BMP file to the file with the given name
+ bool Save(const wxString& filename);
+
+
+ // accessors
+ // ---------
+
+ // return true if DIB was successfully created, false otherwise
+ bool IsOk() const { return m_handle != 0; }
+
+ // get the bitmap size
+ wxSize GetSize() const { DoGetObject(); return wxSize(m_width, m_height); }
+ int GetWidth() const { DoGetObject(); return m_width; }
+ int GetHeight() const { DoGetObject(); return m_height; }
+
+ // get the number of bits per pixel, or depth
+ int GetDepth() const { DoGetObject(); return m_depth; }
+
+ // get the DIB handle
+ HBITMAP GetHandle() const { return m_handle; }
+
+ // get raw pointer to bitmap bits, you should know what you do if you
+ // decide to use it
+ void *GetData() const { DoGetObject(); return m_data; }
+
+
+ // HBITMAP conversion
+ // ------------------
+
+ // these functions are only used by wxWidgets internally right now, please
+ // don't use them directly if possible as they're subject to change
+
+#ifndef __WXWINCE__
+ // creates a DDB compatible with the given (or screen) DC from either
+ // a plain DIB or a DIB section (in which case the last parameter must be
+ // non NULL)
+ static HBITMAP ConvertToBitmap(const BITMAPINFO *pbi,
+ HDC hdc = 0,
+ void *bits = NULL);
+
+ // create a plain DIB (not a DIB section) from a DDB, the caller is
+ // responsable for freeing it using ::GlobalFree()
+ static HGLOBAL ConvertFromBitmap(HBITMAP hbmp);
+
+ // creates a DIB from the given DDB or calculates the space needed by it:
+ // if pbi is NULL, only the space is calculated, otherwise pbi is supposed
+ // to point at BITMAPINFO of the correct size which is filled by this
+ // function (this overload is needed for wxBitmapDataObject code in
+ // src/msw/ole/dataobj.cpp)
+ static size_t ConvertFromBitmap(BITMAPINFO *pbi, HBITMAP hbmp);
+#endif // __WXWINCE__
+
+
+ // wxImage conversion
+ // ------------------
+
+#if wxUSE_IMAGE
+ // create a DIB from the given image, the DIB will be either 24 or 32 (if
+ // the image has alpha channel) bpp
+ wxDIB(const wxImage& image) { Init(); (void)Create(image); }
+
+ // same as the above ctor but with the return code
+ bool Create(const wxImage& image);
+
+ // create wxImage having the same data as this DIB
+ wxImage ConvertToImage() const;
+#endif // wxUSE_IMAGE
+
+
+ // helper functions
+ // ----------------
+
+ // return the size of one line in a DIB with given width and depth: the
+ // point here is that as the scan lines need to be DWORD aligned so we may
+ // need to add some padding
+ static unsigned long GetLineSize(int width, int depth)
+ {
+ return ((width*depth + 31) & ~31) >> 3;
+ }
+
+private:
+ // common part of all ctors
+ void Init();
+
+ // free resources
+ void Free();
+
+ // initialize the contents from the provided DDB (Create() must have been
+ // already called)
+ bool CopyFromDDB(HBITMAP hbmp);
+
+
+ // the DIB section handle, 0 if invalid
+ HBITMAP m_handle;
+
+ // NB: we could store only m_handle and not any of the other fields as
+ // we may always retrieve them from it using ::GetObject(), but we
+ // decide to still store them for efficiency concerns -- however if we
+ // don't have them from the very beginning (e.g. DIB constructed from a
+ // bitmap), we only retrieve them when necessary and so these fields
+ // should *never* be accessed directly, even from inside wxDIB code
+
+ // function which must be called before accessing any members and which
+ // gets their values from m_handle, if not done yet
+ void DoGetObject() const;
+
+ // pointer to DIB bits, may be NULL
+ void *m_data;
+
+ // size and depth of the image
+ int m_width,
+ m_height,
+ m_depth;
+
+ // in some cases we could be using a handle which we didn't create and in
+ // this case we shouldn't free it neither -- this flag tell us if this is
+ // the case
+ bool m_ownsHandle;
+
+
+ // DIBs can't be copied
+ wxDIB(const wxDIB&);
+ wxDIB& operator=(const wxDIB&);
+};
+
+// ----------------------------------------------------------------------------
+// inline functions implementation
+// ----------------------------------------------------------------------------
+
+inline
+void wxDIB::Init()
+{
+ m_handle = 0;
+ m_ownsHandle = true;
+
+ m_data = NULL;
+
+ m_width =
+ m_height =
+ m_depth = 0;
+}
+
+inline
+void wxDIB::Free()
+{
+ if ( m_handle && m_ownsHandle )
+ {
+ if ( !::DeleteObject(m_handle) )
+ {
+ wxLogLastError(wxT("DeleteObject(hDIB)"));
+ }
+
+ Init();
+ }
+}
+
+inline wxDIB::~wxDIB()
+{
+ Free();
+}
projects / wxWidgets.git / blobdiff