X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/a660d684eda27638bca0384b2058911a31c8e845..e815120e412d91e79c98dd0afac2a1e399f10810:/docs/latex/wx/tbitmap.tex?ds=sidebyside diff --git a/docs/latex/wx/tbitmap.tex b/docs/latex/wx/tbitmap.tex index ce20413d8e..48db4af4e4 100644 --- a/docs/latex/wx/tbitmap.tex +++ b/docs/latex/wx/tbitmap.tex @@ -1,4 +1,4 @@ -\section{Bitmaps overview}\label{wxbitmapoverview} +\section{Bitmaps and icons overview}\label{wxbitmapoverview} Classes: \helpref{wxBitmap}{wxbitmap}, \helpref{wxBitmapHandler}{wxbitmaphandler}, \helpref{wxIcon}{wxicon}, \helpref{wxCursor}{wxcursor}. @@ -10,49 +10,151 @@ required. A bitmap created dynamically or loaded from a file can be selected into a memory device context (instance of \helpref{wxMemoryDC}{wxmemorydc}). This -enables the bitmap to be copied to a canvas or memory device context -using \helpref{wxDC::Blit}{wxdcblit}, or to be used as a drawing surface. The {\bf -wxToolBarSimple} class is implemented using bitmaps, and the toolbar demo -shows one of the toolbar bitmaps being used for drawing a miniature -version of the graphic which appears on the main canvas. +enables the bitmap to be copied to a window or memory device context +using \helpref{wxDC::Blit}{wxdcblit}, or to be used as a drawing surface. See \helpref{wxMemoryDC}{wxmemorydc} for an example of drawing onto a bitmap. -The following shows the conditional compilation required to load a -bitmap in X and in Windows 3. The alternative is to use the string -version of the bitmap constructor, which loads a file under X and a -resource under Windows 3, but has the disadvantage of requiring the -X icon file to be available at run-time. +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. \begin{verbatim} -#ifdef wx_x -#include "aiai.xbm" +#include "mondrian.xpm" +\end{verbatim} + +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, \helpref{wxICON}{wxiconmacro}, is available which creates an icon using an XPM +on the appropriate platform, or an icon resource on Windows. + +\begin{verbatim} +wxIcon icon(wxICON(mondrian)); + +// Equivalent to: + +#if defined(__WXGTK__) || defined(__WXMOTIF__) +wxIcon icon(mondrian_xpm); #endif -#ifdef wx_msw - wxIcon *icon = new wxBitmap("aiai"); + +#if defined(__WXMSW__) +wxIcon icon("mondrian"); #endif -#ifdef wx_x - wxIcon *icon = new wxBitmap(aiai_bits, aiai_width, aiai_height); +\end{verbatim} + +There is also a corresponding \helpref{wxBITMAP}{wxbitmapmacro} macro which allows +to create the bitmaps in much the same way as \helpref{wxICON}{wxiconmacro} 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 {\tt \_xpm} +suffix). For example: + +\begin{verbatim} +// 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 \end{verbatim} -\subsection{Loading bitmaps: further information} +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 {\tt \#ifdef}s. Even better, +use the same XPMs on all platforms. + +\subsection{Supported bitmap file formats}\label{supportedbitmapformats} + +The following lists the formats handled on different platforms. Note +that missing or partially-implemented formats are automatically supplemented +by the \helpref{wxImage}{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. + +\wxheading{wxBitmap} + +Under Windows, wxBitmap may load the following formats: + +\begin{itemize}\itemsep=0pt +\item Windows bitmap resource (wxBITMAP\_TYPE\_BMP\_RESOURCE) +\item Windows bitmap file (wxBITMAP\_TYPE\_BMP) +\item XPM data and file (wxBITMAP\_TYPE\_XPM) +\item All formats that are supported by the \helpref{wxImage}{wximage} class. +\end{itemize} + +Under wxGTK, wxBitmap may load the following formats: + +\begin{itemize}\itemsep=0pt +\item XPM data and file (wxBITMAP\_TYPE\_XPM) +\item All formats that are supported by the \helpref{wxImage}{wximage} class. +\end{itemize} + +Under wxMotif and wxX11, wxBitmap may load the following formats: -There is provision for a number of bitmap -formats via the standard wxBitmap class. These facilities can -be enabled or disabled using settings in wx\_setup.h. +\begin{itemize}\itemsep=0pt +\item XBM data and file (wxBITMAP\_TYPE\_XBM) +\item XPM data and file (wxBITMAP\_TYPE\_XPM) +\item All formats that are supported by the \helpref{wxImage}{wximage} class. +\end{itemize} -XPM colour pixmaps may be loaded and saved under Windows and X, with -some restrictions imposed by the lack of colourmap facility when -using XPM files. The user may elect to use XPM files as a cross-platform -stabdard, or translate between XPM and BMP files using a suitable -utility. +\wxheading{wxIcon} -Also, under Windows, DIBs (device independent bitmaps with extension BMP) -may be dynamically loaded and saved. Under X, GIF and BMP files may be -loaded but not saved. +Under Windows, wxIcon may load the following formats: -\subsection{Bitmap format handlers} +\begin{itemize}\itemsep=0pt +\item Windows icon resource (wxBITMAP\_TYPE\_ICO\_RESOURCE) +\item Windows icon file (wxBITMAP\_TYPE\_ICO) +\item XPM data and file (wxBITMAP\_TYPE\_XPM) +\end{itemize} + +Under wxGTK, wxIcon may load the following formats: + +\begin{itemize}\itemsep=0pt +\item XPM data and file (wxBITMAP\_TYPE\_XPM) +\item All formats that are supported by the \helpref{wxImage}{wximage} class. +\end{itemize} + +Under wxMotif and wxX11, wxIcon may load the following formats: + +\begin{itemize}\itemsep=0pt +\item XBM data and file (wxBITMAP\_TYPE\_XBM) +\item XPM data and file (wxBITMAP\_TYPE\_XPM) +\item All formats that are supported by the \helpref{wxImage}{wximage} class. +\end{itemize} + +\wxheading{wxCursor} + +Under Windows, wxCursor may load the following formats: + +\begin{itemize}\itemsep=0pt +\item Windows cursor resource (wxBITMAP\_TYPE\_CUR\_RESOURCE) +\item Windows cursor file (wxBITMAP\_TYPE\_CUR) +\item Windows icon file (wxBITMAP\_TYPE\_ICO) +\item Windows bitmap file (wxBITMAP\_TYPE\_BMP) +\end{itemize} + +Under wxGTK, wxCursor may load the following formats (in additional +to stock cursors): + +\begin{itemize}\itemsep=0pt +\item None (stock cursors only). +\end{itemize} + +Under wxMotif and wxX11, wxCursor may load the following formats: + +\begin{itemize}\itemsep=0pt +\item XBM data and file (wxBITMAP\_TYPE\_XBM) +\end{itemize} + +\subsection{Bitmap format handlers}\label{bitmaphandlers} 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, @@ -62,24 +164,8 @@ 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 \helpref{wxBitmap::AddHandler}{wxbitmapaddhandler}. For example: - -{\small -\begin{verbatim} - #include "JPEGBitmapHandler.h" - ... - // Initialisation - wxBitmap::AddHandler(new wxJPEGBitmapHandler); - ... -\end{verbatim} -} - -Assuming wxJPEGBitmapHandler has been written correctly, you should now be able to load and save JPEG files -using the usual wxBitmap API. - -To see how bitmap handlers are implemented, please look at the files {\tt bitmap.h} and {\tt bitmap.cpp}. - -\subsection{wxIcon overview}\label{wxiconoverview} +then call the static function \helpref{wxBitmap::AddHandler}{wxbitmapaddhandler}. -TODO. +{\bf 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.