eaaa6a06a2
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@92 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
684 lines
19 KiB
TeX
684 lines
19 KiB
TeX
\section{\class{wxBitmap}}\label{wxbitmap}
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%\overview{Overview}{wxbitmapoverview}
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%
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This class encapsulates the concept of a platform-dependent bitmap,
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either monochrome or colour.
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\wxheading{Derived from}
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\helpref{wxGDIObject}{wxgdiobject}\\
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\helpref{wxObject}{wxobject}
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\wxheading{See also}
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\helpref{wxBitmap overview}{wxbitmapoverview}, \helpref{wxDC::Blit}{wxdcblit}, \helpref{wxIcon}{wxicon}, \helpref{wxCursor}{wxcursor}, \helpref{wxMemoryDC}{wxmemorydc}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxBitmap::wxBitmap}\label{wxbitmapconstr}
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\func{}{wxBitmap}{\void}
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Default constructor.
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\func{}{wxBitmap}{\param{const wxBitmap\& }{bitmap}}
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\func{}{wxBitmap}{\param{const wxBitmap* }{bitmap}}
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Copy constructors.
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\func{}{wxBitmap}{\param{void*}{ data}, \param{int}{ type}, \param{int}{ width}, \param{int}{ height}, \param{int}{ depth = -1}}
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Creates a bitmap from the given data, which can be of arbitrary type.
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\func{}{wxBitmap}{\param{const char}{ bits[]}, \param{int}{ width}, \param{int}{ height}\\
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\param{int}{ depth = 1}}
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Creates a bitmap from an array of bits.
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\func{}{wxBitmap}{\param{int}{ width}, \param{int}{ height}, \param{int}{ depth = -1}}
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Creates a new bitmap.
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\func{}{wxBitmap}{\param{const char**}{ bits}}
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Creates a bitmap from XPM data.
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\func{}{wxBitmap}{\param{const wxString\& }{name}, \param{long}{ type}}
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Loads a bitmap from a file or resource.
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\wxheading{Parameters}
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\docparam{bits}{Specifies an array of pixel values.}
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\docparam{width}{Specifies the width of the bitmap.}
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\docparam{height}{Specifies the height of the bitmap.}
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\docparam{depth}{Specifies the depth of the bitmap. If this is omitted, the display depth of the
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screen is used.}
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\docparam{name}{This can refer to a resource name under MS Windows, or a filename under MS Windows and X.
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Its meaning is determined by the {\it flags} parameter.}
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\docparam{type}{May be one of the following:
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\twocolwidtha{5cm}
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\begin{twocollist}
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\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_BMP}}}{Load a Windows bitmap file.}
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\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_BMP\_RESOURCE}}}{Load a Windows bitmap from the resource database.}
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\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_GIF}}}{Load a GIF bitmap file.}
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\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_XBM}}}{Load an X bitmap file.}
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\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_XPM}}}{Load an XPM bitmap file.}
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\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_RESOURCE}}}{Load a Windows resource name.}
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\end{twocollist}
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The validity of these flags depends on the platform and wxWindows configuration.
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If all possible wxWindows settings are used, the Windows platform supports BMP, BMP\_RESOURCE,
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XPM\_DATA, and XPM. Under X, the available formats are BMP, GIF, XBM, and XPM.}
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\wxheading{Remarks}
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The first form constructs a bitmap object with no data; an assignment or another member function such as Create
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or LoadFile must be called subsequently.
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The second and third forms provide copy constructors. Note that these do not copy the
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bitmap data, but instead a pointer to the data, keeping a reference count. They are therefore
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very efficient operations.
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The fourth form constructs a bitmap from data whose type and value depends on
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the value of the {\it type} argument.
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The fifth form constructs a (usually monochrome) bitmap from an array of pixel values, under both
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X and Windows.
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The sixth form constructs a new bitmap.
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The seventh form constructs a bitmap from pixmap (XPM) data, if wxWindows has been configured
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to incorporate this feature.
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To use this constructor, you must first include an XPM file. For
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example, assuming that the file {\tt mybitmap.xpm} contains an XPM array
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of character pointers called mybitmap:
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\begin{verbatim}
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#include "mybitmap.xpm"
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...
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wxBitmap *bitmap = new wxBitmap(mybitmap);
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\end{verbatim}
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The eighth form constructs a bitmap from a file or resource. {\it name} can refer
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to a resource name under MS Windows, or a filename under MS Windows and X.
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Under Windows, {\it type} defaults to wxBITMAP\_TYPE\_BMP\_RESOURCE.
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Under X, {\it type} defaults to wxBITMAP\_TYPE\_XBM.
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\wxheading{See also}
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\helpref{wxBitmap::LoadFile}{wxbitmaploadfile}
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\membersection{wxBitmap::\destruct{wxBitmap}}
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\func{}{\destruct{wxBitmap}}{\void}
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Destroys the wxBitmap object and possibly the underlying bitmap data.
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Because reference counting is used, the bitmap may not actually be
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destroyed at this point - only when the reference count is zero will the
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data be deleted.
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If the application omits to delete the bitmap explicitly, the bitmap will be
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destroyed automatically by wxWindows when the application exits.
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Do not delete a bitmap that is selected into a memory device context.
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\membersection{wxBitmap::AddHandler}\label{wxbitmapaddhandler}
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\func{static void}{AddHandler}{\param{wxBitmapHandler*}{ handler}}
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Adds a handler to the end of the static list of format handlers.
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\docparam{handler}{A new bitmap format handler object. There is usually only one instance
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of a given handler class in an application session.}
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\wxheading{See also}
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\helpref{wxBitmapHandler}{wxbitmaphandler}
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\membersection{wxBitmap::CleanUpHandlers}
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\func{static void}{CleanUpHandlers}{\void}
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Deletes all bitmap handlers.
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This function is called by wxWindows on exit.
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\membersection{wxBitmap::Create}
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\func{virtual bool}{Create}{\param{int}{ width}, \param{int}{ height}, \param{int}{ depth = -1}}
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Creates a fresh bitmap. If the final argument is omitted, the display depth of
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the screen is used.
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\func{virtual bool}{Create}{\param{void*}{ data}, \param{int}{ type}, \param{int}{ width}, \param{int}{ height}, \param{int}{ depth = -1}}
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Creates a bitmap from the given data, which can be of arbitrary type.
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\wxheading{Parameters}
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\docparam{width}{The width of the bitmap in pixels.}
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\docparam{height}{The height of the bitmap in pixels.}
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\docparam{depth}{The depth of the bitmap in pixels. If this is -1, the screen depth is used.}
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\docparam{data}{Data whose type depends on the value of {\it type}.}
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\docparam{type}{A bitmap type identifier - see \helpref{wxBitmap::wxBitmap}{wxbitmapconstr} for a list
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of possible values.}
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\wxheading{Return value}
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TRUE if the call succeeded, FALSE otherwise.
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\wxheading{Remarks}
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The first form works on all platforms. The portability of the second form depends on the
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type of data.
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\wxheading{See also}
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\helpref{wxBitmap::wxBitmap}{wxbitmapconstr}
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\membersection{wxBitmap::FindHandler}
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\func{static wxBitmapHandler*}{FindHandler}{\param{const wxString\& }{name}}
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Finds the handler with the given name.
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\func{static wxBitmapHandler*}{FindHandler}{\param{const wxString\& }{extension}, \param{long}{ bitmapType}}
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Finds the handler associated with the given extension and type.
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\func{static wxBitmapHandler*}{FindHandler}{\param{long }{bitmapType}}
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Finds the handler associated with the given bitmap type.
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\docparam{name}{The handler name.}
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\docparam{extension}{The file extension, such as ``bmp".}
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\docparam{bitmapType}{The bitmap type, such as wxBITMAP\_TYPE\_BMP.}
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\wxheading{Return value}
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A pointer to the handler if found, NULL otherwise.
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\wxheading{See also}
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\helpref{wxBitmapHandler}{wxbitmaphandler}
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\membersection{wxBitmap::GetDepth}
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\constfunc{int}{GetDepth}{\void}
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Gets the colour depth of the bitmap. A value of 1 indicates a
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monochrome bitmap.
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\membersection{wxBitmap::GetHandlers}
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\func{static wxList\&}{GetHandlers}{\void}
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Returns the static list of bitmap format handlers.
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\wxheading{See also}
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\helpref{wxBitmapHandler}{wxbitmaphandler}
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\membersection{wxBitmap::GetHeight}\label{wxbitmapgetheight}
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\constfunc{int}{GetHeight}{\void}
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Gets the height of the bitmap in pixels.
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\membersection{wxBitmap::GetPalette}\label{wxbitmapgetpalette}
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\constfunc{wxPalette*}{GetPalette}{\void}
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Gets the associated palette (if any) which may have been loaded from a file
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or set for the bitmap.
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\wxheading{See also}
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\helpref{wxPalette}{wxpalette}
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\membersection{wxBitmap::GetMask}\label{wxbitmapgetmask}
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\constfunc{wxMask*}{GetMask}{\void}
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Gets the associated mask if any) which may have been loaded from a file
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or set for the bitmap.
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\wxheading{See also}
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\helpref{wxBitmap::SetMask}{wxbitmapsetmask}, \helpref{wxMask}{wxmask}
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\membersection{wxBitmap::GetWidth}\label{wxbitmapgetwidth}
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\constfunc{int}{GetWidth}{\void}
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Gets the width of the bitmap in pixels.
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\wxheading{See also}
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\helpref{wxBitmap::GetHeight}{wxbitmapgetheight}
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\membersection{wxBitmap::InitStandardHandlers}
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\func{static void}{InitStandardHandlers}{\void}
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Adds the standard bitmap format handlers, which, depending on wxWindows
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configuration, can be handlers for Windows bitmap, Windows bitmap resource, and XPM.
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This function is called by wxWindows on startup.
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\wxheading{See also}
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\helpref{wxBitmapHandler}{wxbitmaphandler}
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\membersection{wxBitmap::InsertHandler}
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\func{static void}{InsertHandler}{\param{wxBitmapHandler*}{ handler}}
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Adds a handler at the start of the static list of format handlers.
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\docparam{handler}{A new bitmap format handler object. There is usually only one instance
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of a given handler class in an application session.}
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\wxheading{See also}
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\helpref{wxBitmapHandler}{wxbitmaphandler}
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\membersection{wxBitmap::LoadFile}\label{wxbitmaploadfile}
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\func{bool}{LoadFile}{\param{const wxString\&}{ name}, \param{long}{ type}}
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Loads a bitmap from a file or resource.
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\wxheading{Parameters}
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\docparam{name}{Either a filename or a Windows resource name.
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The meaning of {\it name} is determined by the {\it type} parameter.}
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\docparam{type}{One of the following values:
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\twocolwidtha{5cm}
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\begin{twocollist}
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\twocolitem{{\bf wxBITMAP\_TYPE\_BMP}}{Load a Windows bitmap file.}
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\twocolitem{{\bf wxBITMAP\_TYPE\_BMP\_RESOURCE}}{Load a Windows bitmap from the resource database.}
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\twocolitem{{\bf wxBITMAP\_TYPE\_GIF}}{Load a GIF bitmap file.}
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\twocolitem{{\bf wxBITMAP\_TYPE\_XBM}}{Load an X bitmap file.}
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\twocolitem{{\bf wxBITMAP\_TYPE\_XPM}}{Load an XPM bitmap file.}
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\end{twocollist}
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The validity of these flags depends on the platform and wxWindows configuration.}
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\wxheading{Return value}
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TRUE if the operation succeeded, FALSE otherwise.
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\wxheading{Remarks}
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A palette may be associated with the bitmap if one exists (especially for
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colour Windows bitmaps), and if the code supports it. You can check
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if one has been created by using the \helpref{GetPalette}{wxbitmapgetpalette} member.
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\wxheading{See also}
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\helpref{wxBitmap::SaveFile}{wxbitmapsavefile}
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\membersection{wxBitmap::Ok}\label{wxbitmapok}
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\constfunc{bool}{Ok}{\void}
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Returns TRUE if bitmap data is present.
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\membersection{wxBitmap::RemoveHandler}
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\func{static bool}{RemoveHandler}{\param{const wxString\& }{name}}
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Finds the handler with the given name, and removes it. The handler
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is not deleted.
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\docparam{name}{The handler name.}
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\wxheading{Return value}
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TRUE if the handler was found and removed, FALSE otherwise.
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\wxheading{See also}
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\helpref{wxBitmapHandler}{wxbitmaphandler}
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\membersection{wxBitmap::SaveFile}\label{wxbitmapsavefile}
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\func{bool}{SaveFile}{\param{const wxString\& }{name}, \param{int}{ type}, \param{wxPalette* }{palette = NULL}}
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Saves a bitmap in the named file.
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\wxheading{Parameters}
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\docparam{name}{A filename. The meaning of {\it name} is determined by the {\it type} parameter.}
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\docparam{type}{One of the following values:
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\twocolwidtha{5cm}
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\begin{twocollist}
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\twocolitem{{\bf wxBITMAP\_TYPE\_BMP}}{Save a Windows bitmap file.}
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\twocolitem{{\bf wxBITMAP\_TYPE\_GIF}}{Save a GIF bitmap file.}
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\twocolitem{{\bf wxBITMAP\_TYPE\_XBM}}{Save an X bitmap file.}
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\twocolitem{{\bf wxBITMAP\_TYPE\_XPM}}{Save an XPM bitmap file.}
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\end{twocollist}
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The validity of these flags depends on the platform and wxWindows configuration.}
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\docparam{palette}{An optional palette used for saving the bitmap. TODO: this parameter should
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probably be eliminated; instead the app should set the palette before saving.}
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\wxheading{Return value}
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TRUE if the operation succeeded, FALSE otherwise.
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\wxheading{Remarks}
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Depending on how wxWindows has been configured, not all formats may be available.
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\wxheading{See also}
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\helpref{wxBitmap::LoadFile}{wxbitmaploadfile}
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\membersection{wxBitmap::SetDepth}\label{wxbitmapsetdepth}
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\func{void}{SetDepth}{\param{int }{depth}}
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Sets the depth member (does not affect the bitmap data).
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\wxheading{Parameters}
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\docparam{depth}{Bitmap depth.}
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\membersection{wxBitmap::SetHeight}\label{wxbitmapsetheight}
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\func{void}{SetHeight}{\param{int }{height}}
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Sets the height member (does not affect the bitmap data).
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\wxheading{Parameters}
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\docparam{height}{Bitmap height in pixels.}
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\membersection{wxBitmap::SetMask}\label{wxbitmapsetmask}
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\func{void}{SetMask}{\param{wxMask* }{mask}}
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Sets the mask for this bitmap.
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\wxheading{Remarks}
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The bitmap object owns the mask once this has been called.
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\wxheading{See also}
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\helpref{wxBitmap::GetMask}{wxbitmapgetmask}, \helpref{wxMask}{wxmask}
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\membersection{wxBitmap::SetOk}
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\func{void}{SetOk}{\param{int }{isOk}}
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Sets the validity member (does not affect the bitmap data).
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\wxheading{Parameters}
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\docparam{isOk}{Validity flag.}
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\membersection{wxBitmap::SetPalette}\label{wxbitmapsetpalette}
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\func{void}{SetPalette}{\param{wxPalette* }{palette}}
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Sets the associated palette: it will be deleted in the wxBitmap
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destructor, so if you do not wish it to be deleted automatically,
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reset the palette to NULL before the bitmap is deleted.
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\wxheading{Parameters}
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\docparam{palette}{The palette to set.}
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\wxheading{Remarks}
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The bitmap object owns the palette once this has been called.
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\wxheading{See also}
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\helpref{wxPalette}{wxpalette}
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\membersection{wxBitmap::SetWidth}
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\func{void}{SetWidth}{\param{int }{width}}
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Sets the width member (does not affect the bitmap data).
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\wxheading{Parameters}
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\docparam{width}{Bitmap width in pixels.}
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\membersection{wxBitmap::operator $=$}
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\func{wxBitmap\& }{operator $=$}{\param{const wxBitmap\& }{bitmap}}
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Assignment operator. This operator does not copy any data, but instead
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passes a pointer to the data in {\it bitmap} and increments a reference
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counter. It is a fast operation.
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\wxheading{Parameters}
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\docparam{bitmap}{Bitmap to assign.}
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\wxheading{Return value}
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Returns 'this' object.
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\membersection{wxBitmap::operator $==$}
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\func{bool}{operator $==$}{\param{const wxBitmap\& }{bitmap}}
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Equality operator. This operator tests whether the internal data pointers are
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equal (a fast test).
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\wxheading{Parameters}
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\docparam{bitmap}{Bitmap to compare with 'this'}
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\wxheading{Return value}
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Returns TRUE if the bitmaps were effectively equal, FALSE otherwise.
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\membersection{wxBitmap::operator $!=$}
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\func{bool}{operator $!=$}{\param{const wxBitmap\& }{bitmap}}
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Inequality operator. This operator tests whether the internal data pointers are
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unequal (a fast test).
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\wxheading{Parameters}
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\docparam{bitmap}{Bitmap to compare with 'this'}
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\wxheading{Return value}
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Returns TRUE if the bitmaps were unequal, FALSE otherwise.
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\section{\class{wxBitmapHandler}}\label{wxbitmaphandler}
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\overview{Overview}{wxbitmapoverview}
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This is the base class for implementing bitmap file loading/saving, and bitmap creation from data.
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It is used within wxBitmap and is not normally seen by the application.
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If you wish to extend the capabilities of wxBitmap, derive a class from wxBitmapHandler
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and add the handler using \helpref{wxBitmap::AddHandler}{wxbitmapaddhandler} in your
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application initialisation.
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\wxheading{Derived from}
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\helpref{wxObject}{wxobject}
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\wxheading{See also}
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\helpref{wxBitmap}{wxbitmap}, \helpref{wxIcon}{wxicon}, \helpref{wxCursor}{wxcursor}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxBitmapHandler::wxBitmapHandler}\label{wxbitmaphandlerconstr}
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\func{}{wxBitmapHandler}{\void}
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Default constructor. In your own default constructor, initialise the members
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m\_name, m\_extension and m\_type.
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\membersection{wxBitmapHandler::\destruct{wxBitmapHandler}}
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\func{}{\destruct{wxBitmapHandler}}{\void}
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Destroys the wxBitmapHandler object.
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\membersection{wxBitmapHandler::Create}
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\func{virtual bool}{Create}{\param{wxBitmap* }{bitmap}, \param{void*}{ data}, \param{int}{ type}, \param{int}{ width}, \param{int}{ height}, \param{int}{ depth = -1}}
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Creates a bitmap from the given data, which can be of arbitrary type. The wxBitmap object {\it bitmap} is
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manipulated by this function.
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\wxheading{Parameters}
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\docparam{bitmap}{The wxBitmap object.}
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\docparam{width}{The width of the bitmap in pixels.}
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\docparam{height}{The height of the bitmap in pixels.}
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\docparam{depth}{The depth of the bitmap in pixels. If this is -1, the screen depth is used.}
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\docparam{data}{Data whose type depends on the value of {\it type}.}
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\docparam{type}{A bitmap type identifier - see \helpref{wxBitmapHandler::wxBitmapHandler}{wxbitmapconstr} for a list
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of possible values.}
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\wxheading{Return value}
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TRUE if the call succeeded, FALSE otherwise (the default).
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\membersection{wxBitmapHandler::GetName}
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\constfunc{wxString}{GetName}{\void}
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Gets the name of this handler.
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\membersection{wxBitmapHandler::GetExtension}
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\constfunc{wxString}{GetExtension}{\void}
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Gets the file extension associated with this handler.
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\membersection{wxBitmapHandler::GetType}
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\constfunc{long}{GetType}{\void}
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Gets the bitmap type associated with this handler.
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\membersection{wxBitmapHandler::LoadFile}\label{wxbitmaphandlerloadfile}
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\func{bool}{LoadFile}{\param{wxBitmap* }{bitmap}, \param{const wxString\&}{ name}, \param{long}{ type}}
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Loads a bitmap from a file or resource, putting the resulting data into {\it bitmap}.
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\wxheading{Parameters}
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\docparam{bitmap}{The bitmap object which is to be affected by this operation.}
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\docparam{name}{Either a filename or a Windows resource name.
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The meaning of {\it name} is determined by the {\it type} parameter.}
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\docparam{type}{See \helpref{wxBitmap::wxBitmap}{wxbitmapconstr} for values this can take.}
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\wxheading{Return value}
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TRUE if the operation succeeded, FALSE otherwise.
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\wxheading{See also}
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\helpref{wxBitmap::LoadFile}{wxbitmaploadfile}\\
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\helpref{wxBitmap::SaveFile}{wxbitmapsavefile}\\
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\helpref{wxBitmapHandler::SaveFile}{wxbitmaphandlersavefile}
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\membersection{wxBitmapHandler::SaveFile}\label{wxbitmaphandlersavefile}
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\func{bool}{SaveFile}{\param{wxBitmap* }{bitmap}, \param{const wxString\& }{name}, \param{int}{ type}, \param{wxPalette* }{palette = NULL}}
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Saves a bitmap in the named file.
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\wxheading{Parameters}
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\docparam{bitmap}{The bitmap object which is to be affected by this operation.}
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\docparam{name}{A filename. The meaning of {\it name} is determined by the {\it type} parameter.}
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\docparam{type}{See \helpref{wxBitmap::wxBitmap}{wxbitmapconstr} for values this can take.}
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\docparam{palette}{An optional palette used for saving the bitmap. TODO: this parameter should
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probably be eliminated; instead the app should set the palette before saving.}
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\wxheading{Return value}
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TRUE if the operation succeeded, FALSE otherwise.
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\wxheading{See also}
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\helpref{wxBitmap::LoadFile}{wxbitmaploadfile}\\
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\helpref{wxBitmap::SaveFile}{wxbitmapsavefile}\\
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\helpref{wxBitmapHandler::LoadFile}{wxbitmaphandlerloadfile}
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\membersection{wxBitmapHandler::SetName}
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\func{void}{SetName}{\param{const wxString\& }{name}}
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Sets the handler name.
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\wxheading{Parameters}
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\docparam{name}{Handler name.}
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\membersection{wxBitmapHandler::SetExtension}
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\func{void}{SetExtension}{\param{const wxString\& }{extension}}
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Sets the handler extension.
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\wxheading{Parameters}
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\docparam{extension}{Handler extension.}
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\membersection{wxBitmapHandler::SetType}
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\func{void}{SetType}{\param{long }{type}}
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Sets the handler type.
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\wxheading{Parameters}
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\docparam{name}{Handler type.}
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