update and complete Unicode overview; add an overview of changes since wx 2.8

[wxWidgets.git] / docs / doxygen / overviews / bitmap.h

diff --git a/docs/doxygen/overviews/bitmap.h b/docs/doxygen/overviews/bitmap.h
index bdb0034aa9c9a0541c51f7b5818d5913511189ed..0b9f20d5b9c9ba183915edf6c62d9d72fc3b8867 100644 (file)
--- a/docs/doxygen/overviews/bitmap.h
+++ b/docs/doxygen/overviews/bitmap.h
@@ -1,178 +1,182 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        bitmap
+// Name:        bitmap.h

 // Purpose:     topic overview
 // Author:      wxWidgets team
 // RCS-ID:      $Id$
 // Licence:     wxWindows license
 /////////////////////////////////////////////////////////////////////////////
 
 // Purpose:     topic overview
 // Author:      wxWidgets team
 // RCS-ID:      $Id$
 // Licence:     wxWindows license
 /////////////////////////////////////////////////////////////////////////////
 

-/*!
+/**

 
 

- @page bitmap_overview Bitmaps and icons overview
+@page overview_bitmap Bitmaps and Icons

 
 

- Classes: #wxBitmap, #wxBitmapHandler, #wxIcon, #wxCursor.
- The wxBitmap class encapsulates the concept of a platform-dependent bitmap,
- either monochrome or colour. Platform-specific methods for creating a
- wxBitmap object from an existing file are catered for, and
- this is an occasion where conditional compilation will sometimes be
- required.
- A bitmap created dynamically or loaded from a file can be selected
- into a memory device context (instance of #wxMemoryDC). This
- enables the bitmap to be copied to a window or memory device context
- using wxDC::Blit, or to be used as a drawing surface.
- See #wxMemoryDC for an example of drawing onto a bitmap.
- All wxWidgets platforms support XPMs for small bitmaps and icons.
- You may include the XPM inline as below, since it's C code, or you
- can load it at run-time.
+Classes:
+@li wxBitmap
+@li wxBitmapHandler
+@li wxIcon
+@li wxCursor

 
 

- @code
- #include "mondrian.xpm"
- @endcode
+The wxBitmap class encapsulates the concept of a platform-dependent bitmap,
+either monochrome or colour. Platform-specific methods for creating a wxBitmap
+object from an existing file are catered for, and this is an occasion where
+conditional compilation will sometimes be required.

 
 

- Sometimes you wish to use a .ico resource on Windows, and XPMs on
- other platforms (for example to take advantage of Windows' support for multiple icon resolutions).
- A macro, #wxICON, is available which creates an icon using an XPM
- on the appropriate platform, or an icon resource on Windows.
+A bitmap created dynamically or loaded from a file can be selected into a
+memory device context (instance of wxMemoryDC). This enables the bitmap to be
+copied to a window or memory device context using wxDC::Blit(), or to be used
+as a drawing surface.

 
 

- @code
- wxIcon icon(wxICON(mondrian));
+See wxMemoryDC for an example of drawing onto a bitmap.

 
 

- // Equivalent to:
+All wxWidgets platforms support XPMs for small bitmaps and icons. You may
+include the XPM inline as below, since it's C code, or you can load it at
+run-time.

 
 

- #if defined(__WXGTK__) || defined(__WXMOTIF__)
- wxIcon icon(mondrian_xpm);
- #endif
+@code
+#include "mondrian.xpm"
+@endcode

 
 

- #if defined(__WXMSW__)
- wxIcon icon("mondrian");
- #endif
- @endcode
+Sometimes you wish to use a .ico resource on Windows, and XPMs on other
+platforms (for example to take advantage of Windows' support for multiple icon
+resolutions).

 
 

- There is also a corresponding #wxBITMAP macro which allows
- to create the bitmaps in much the same way as #wxICON creates
- icons. It assumes that bitmaps live in resources under Windows or OS2 and XPM
- files under all other platforms (for XPMs, the corresponding file must be
- included before this macro is used, of course, and the name of the bitmap
- should be the same as the resource name under Windows with @c _xpm
- suffix). For example:
+A macro, wxICON(), is available which creates an icon using an XPM on the
+appropriate platform, or an icon resource on Windows:

 
 

- @code
- // an easy and portable way to create a bitmap
- wxBitmap bmp(wxBITMAP(bmpname));
+@code
+wxIcon icon(wxICON(mondrian));

 
 

- // which is roughly equivalent to the following
- #if defined(__WXMSW__) || defined(__WXPM__)
-     wxBitmap bmp("bmpname", wxBITMAP_TYPE_RESOURCE);
- #else // Unix
-     wxBitmap bmp(bmpname_xpm, wxBITMAP_TYPE_XPM);
- #endif
- @endcode
+// The above line is equivalent to this:

 
 

- You should always use wxICON and wxBITMAP macros because they work for any
- platform (unlike the code above which doesn't deal with wxMac, wxX11, ...) and
- are more short and clear than versions with @c #ifdefs. Even better,
- use the same XPMs on all platforms.
- @ref supportedbitmapformats_overview
- @ref bitmaphandlers_overview
+#if defined(__WXGTK__) || defined(__WXMOTIF__)
+    wxIcon icon(mondrian_xpm);
+#endif

 
 

+#if defined(__WXMSW__)
+    wxIcon icon("mondrian");
+#endif
+@endcode

 
 

- @section supportedbitmapformats Supported bitmap file formats
+There is also a corresponding wxBITMAP() macro which allows to create the
+bitmaps in much the same way as wxICON() creates icons. It assumes that bitmaps
+live in resources under Windows or OS2 and XPM files under all other platforms
+(for XPMs, the corresponding file must be included before this macro is used,
+of course, and the name of the bitmap should be the same as the resource name
+under Windows with @c _xpm suffix). For example:

 
 

- The following lists the formats handled on different platforms. Note
- that missing or partially-implemented formats are automatically supplemented
- by the #wxImage to load the data, and then converting
- it to wxBitmap form. Note that using wxImage is the preferred way to
- load images in wxWidgets, with the exception of resources (XPM-files or
- native Windows resources). Writing an image format handler for wxImage
- is also far easier than writing one for wxBitmap, because wxImage has
- exactly one format on all platforms whereas wxBitmap can store pixel data
- very differently, depending on colour depths and platform.
- @b wxBitmap
- Under Windows, wxBitmap may load the following formats:
+@code
+// an easy and portable way to create a bitmap
+wxBitmap bmp(wxBITMAP(bmpname));

 
 

+// which is roughly equivalent to the following
+#if defined(__WXMSW__) || defined(__WXPM__)
+    wxBitmap bmp("bmpname", wxBITMAP_TYPE_RESOURCE);
+#else // Unix
+    wxBitmap bmp(bmpname_xpm, wxBITMAP_TYPE_XPM);
+#endif
+@endcode

 
 

-  Windows bitmap resource (wxBITMAP_TYPE_BMP_RESOURCE)
-  Windows bitmap file (wxBITMAP_TYPE_BMP)
-  XPM data and file (wxBITMAP_TYPE_XPM)
-  All formats that are supported by the #wxImage class.
+You should always use wxICON() and wxBITMAP() macros because they work for any
+platform (unlike the code above which doesn't deal with wxMac, wxX11, ...) and
+are shorter and more clear than versions with many @ifdef_ blocks. Even better,
+use the same XPMs on all platforms.

 
 

+@li @ref overview_bitmap_supportedformats
+@li @ref overview_bitmap_handlers

 
 

- Under wxGTK, wxBitmap may load the following formats:

 
 

+<hr>

 
 

-  XPM data and file (wxBITMAP_TYPE_XPM)
-  All formats that are supported by the #wxImage class.

 
 

+@section overview_bitmap_supportedformats Supported Bitmap File Formats

 
 

- Under wxMotif and wxX11, wxBitmap may load the following formats:
+The following lists the formats handled on different platforms. Note that
+missing or partially-implemented formats are automatically supplemented by
+using wxImage to load the data, and then converting it to wxBitmap form. Note
+that using wxImage is the preferred way to load images in wxWidgets, with the
+exception of resources (XPM-files or native Windows resources).

 
 

+Writing an image format handler for wxImage is also far easier than writing one
+for wxBitmap, because wxImage has exactly one format on all platforms whereas
+wxBitmap can store pixel data very differently, depending on colour depths and
+platform.

 
 

-  XBM data and file (wxBITMAP_TYPE_XBM)
-  XPM data and file (wxBITMAP_TYPE_XPM)
-  All formats that are supported by the #wxImage class.
+@subsection overview_bitmap_supportedformats_bmp wxBitmap

 
 

+Under Windows, wxBitmap may load the following formats:

 
 

- @b wxIcon
- Under Windows, wxIcon may load the following formats:
+    @li Windows bitmap resource (wxBITMAP_TYPE_BMP_RESOURCE)
+    @li Windows bitmap file (wxBITMAP_TYPE_BMP)
+    @li XPM data and file (wxBITMAP_TYPE_XPM)
+    @li All formats that are supported by the wxImage class.

 
 

+Under wxGTK, wxBitmap may load the following formats:

 
 

-  Windows icon resource (wxBITMAP_TYPE_ICO_RESOURCE)
-  Windows icon file (wxBITMAP_TYPE_ICO)
-  XPM data and file (wxBITMAP_TYPE_XPM)
+    @li XPM data and file (wxBITMAP_TYPE_XPM)
+    @li All formats that are supported by the wxImage class.

 
 

+Under wxMotif and wxX11, wxBitmap may load the following formats:

 
 

- Under wxGTK, wxIcon may load the following formats:
+    @li XBM data and file (wxBITMAP_TYPE_XBM)
+    @li XPM data and file (wxBITMAP_TYPE_XPM)
+    @li All formats that are supported by the wxImage class.

 
 

+@subsection overview_bitmap_supportedformats_icon wxIcon

 
 

-  XPM data and file (wxBITMAP_TYPE_XPM)
-  All formats that are supported by the #wxImage class.
+Under Windows, wxIcon may load the following formats:

 
 

+    @li Windows icon resource (wxBITMAP_TYPE_ICO_RESOURCE)
+    @li Windows icon file (wxBITMAP_TYPE_ICO)
+    @li XPM data and file (wxBITMAP_TYPE_XPM)

 
 

- Under wxMotif and wxX11, wxIcon may load the following formats:
+Under wxGTK, wxIcon may load the following formats:

 
 

+    @li XPM data and file (wxBITMAP_TYPE_XPM)
+    @li All formats that are supported by the wxImage class.

 
 

-  XBM data and file (wxBITMAP_TYPE_XBM)
-  XPM data and file (wxBITMAP_TYPE_XPM)
-  All formats that are supported by the #wxImage class.
+Under wxMotif and wxX11, wxIcon may load the following formats:

 
 

+    @li XBM data and file (wxBITMAP_TYPE_XBM)
+    @li XPM data and file (wxBITMAP_TYPE_XPM)
+    @li All formats that are supported by the wxImage class.

 
 

- @b wxCursor
- Under Windows, wxCursor may load the following formats:
+@subsection overview_bitmap_supportedformats_cursor wxCursor

 
 

+Under Windows, wxCursor may load the following formats:

 
 

-  Windows cursor resource (wxBITMAP_TYPE_CUR_RESOURCE)
-  Windows cursor file (wxBITMAP_TYPE_CUR)
-  Windows icon file (wxBITMAP_TYPE_ICO)
-  Windows bitmap file (wxBITMAP_TYPE_BMP)
+    @li Windows cursor resource (wxBITMAP_TYPE_CUR_RESOURCE)
+    @li Windows cursor file (wxBITMAP_TYPE_CUR)
+    @li Windows icon file (wxBITMAP_TYPE_ICO)
+    @li Windows bitmap file (wxBITMAP_TYPE_BMP)

 
 

+Under wxGTK, wxCursor may load the following formats (in addition to stock
+cursors):

 
 

- Under wxGTK, wxCursor may load the following formats (in additional
- to stock cursors):
+    @li None (stock cursors only).

 
 

+Under wxMotif and wxX11, wxCursor may load the following formats:

 
 

-  None (stock cursors only).
+    @li XBM data and file (wxBITMAP_TYPE_XBM)

 
 
 
 

- Under wxMotif and wxX11, wxCursor may load the following formats:
+@section overview_bitmap_handlers Bitmap Format Handlers

 
 

+To provide extensibility, the functionality for loading and saving bitmap
+formats is not implemented in the wxBitmap class, but in a number of handler
+classes, derived from wxBitmapHandler. There is a static list of handlers which
+wxBitmap examines when a file load/save operation is requested.

 
 

-  XBM data and file (wxBITMAP_TYPE_XBM)
+Some handlers are provided as standard, but if you have special requirements,
+you may wish to initialise the wxBitmap class with some extra handlers which
+you write yourself or receive from a third party.

 
 

+To add a handler object to wxBitmap, your application needs to include the
+header which implements it, and then call the static function
+wxBitmap::AddHandler().

 
 

+@note Bitmap handlers are not implemented on all platforms, and new ones rarely
+need to be implemented since wxImage can be used for loading most formats, as
+noted earlier.

 
 

- @section bitmaphandlers Bitmap format handlers
-
- To provide extensibility, the functionality for loading and saving bitmap formats
- is not implemented in the wxBitmap class, but in a number of handler classes,
- derived from wxBitmapHandler. There is a static list of handlers which wxBitmap
- examines when a file load/save operation is requested. Some handlers are provided as standard, but if you
- have special requirements, you may wish to initialise the wxBitmap class with
- some extra handlers which you write yourself or receive from a third party.
- To add a handler object to wxBitmap, your application needs to include the header which implements it, and
- then call the static function wxBitmap::AddHandler.
- @b Note: bitmap handlers are not implemented on all platforms, and new ones rarely need
- to be implemented since wxImage can be used for loading most formats, as noted earlier.
-
- */
-
+*/