\section{\class{wxImage}}\label{wximage}
This class encapsulates a platform-independent image. An image can be created
-from data, or using the constructor taking a wxBitmap object. An image
+from data, or using \helpref{wxBitmap::ConvertToImage}{wxbitmapconverttoimage}. An image
can be loaded from a file in a variety of formats, and is extensible to new formats
via image format handlers. Functions are available to set and get image bits, so
it can be used for basic image manipulation.
A wxImage cannot (currently) be drawn directly to a \helpref{wxDC}{wxdc}. Instead,
a platform-specific \helpref{wxBitmap}{wxbitmap} object must be created from it using
-the \helpref{ConvertToBitmap}{wximageconverttobitmap} function. This bitmap can then
+the \helpref{wxBitmap::wxBitmap(wxImage,int depth)}{wxbitmapconstr} constructor.
+This bitmap can then
be drawn in a device context, using \helpref{wxDC::DrawBitmap}{wxdcdrawbitmap}.
One colour value of the image may be used as a mask colour which will lead to the automatic
creation of a \helpref{wxMask}{wxmask} object associated to the bitmap object.
+\wxheading{Alpha channel support}
+
+Starting from wxWidgets 2.5.0 wxImage supports alpha channel data, that is in
+addition to a byte for the red, green and blue colour components for each pixel
+it also stores a byte representing the pixel opacity. The alpha value of $0$
+corresponds to a transparent pixel (null opacity) while the value of $255$
+means that the pixel is 100\% opaque.
+
+Unlike the RGB data, not all images have the alpha channel and before using
+\helpref{GetAlpha}{wximagegetalpha} you should check if this image contains
+alpha value with \helpref{HasAlpha}{wximagehasalpha}. In fact, currently only
+images loaded from PNG files with transparency information will have alpha
+channel but support for it will be added to the other formats as well (as well
+as support for saving images with alpha channel which is not still implemented
+either).
+
\wxheading{Available image handlers}
The following image handlers are available. {\bf wxBMPHandler} is always
-installed by default. To use other image formats, install the appropiate
+installed by default. To use other image formats, install the appropriate
handler with \helpref{wxImage::AddHandler}{wximageaddhandler} or
\helpref{wxInitAllImageHandlers}{wxinitallimagehandlers}.
\twocolwidtha{5cm}%
\begin{twocollist}
-\twocolitem{{\bf \indexit{wxBMPHandler}}}{Only for loading, always installed.}
-\twocolitem{{\bf \indexit{wxPNGHandler}}}{For loading and saving.}
-\twocolitem{{\bf \indexit{wxJPEGHandler}}}{For loading and saving.}
-\twocolitem{{\bf \indexit{wxGIFHandler}}}{Only for loading, due to legal issues.}
-\twocolitem{{\bf \indexit{wxPCXHandler}}}{For loading and saving (see below).}
-\twocolitem{{\bf \indexit{wxPNMHandler}}}{For loading and saving (see below).}
-\twocolitem{{\bf \indexit{wxTIFFHandler}}}{For loading and saving.}
+\twocolitem{\indexit{wxBMPHandler}}{For loading and saving, always installed.}
+\twocolitem{\indexit{wxPNGHandler}}{For loading (including alpha support) and saving.}
+\twocolitem{\indexit{wxJPEGHandler}}{For loading and saving.}
+\twocolitem{\indexit{wxGIFHandler}}{Only for loading, due to legal issues.}
+\twocolitem{\indexit{wxPCXHandler}}{For loading and saving (see below).}
+\twocolitem{\indexit{wxPNMHandler}}{For loading and saving (see below).}
+\twocolitem{\indexit{wxTIFFHandler}}{For loading and saving.}
+\twocolitem{\indexit{wxIFFHandler}}{For loading only.}
+\twocolitem{\indexit{wxXPMHandler}}{For loading and saving.}
+\twocolitem{\indexit{wxICOHandler}}{For loading and saving.}
+\twocolitem{\indexit{wxCURHandler}}{For loading and saving.}
+\twocolitem{\indexit{wxANIHandler}}{For loading only.}
\end{twocollist}
When saving in PCX format, {\bf wxPCXHandler} will count the number of
\func{}{wxImage}{\param{const wxBitmap\&}{ bitmap}}
-Constructs an image from a platform-dependent bitmap. This preserves
+(Deprecated form, use \helpref{wxBitmap::ConvertToImage}{wxbitmapconverttoimage}
+instead.) Constructs an image from a platform-dependent bitmap. This preserves
mask information so that bitmaps and images can be converted back
and forth without loss in that respect.
-\func{}{wxImage}{\param{int}{ width}, \param{int}{ height}}
+\func{}{wxImage}{\param{int}{ width}, \param{int}{ height}, \param{bool}{ clear=true}}
+
+Creates an image with the given width and height. If {\it clear} is true, the new image will be initialized to black.
+Otherwise, the image data will be uninitialized.
-Creates an image with the given width and height.
+\func{}{wxImage}{\param{int}{ width}, \param{int}{ height}, \param{unsigned char*}{ data}, \param{bool}{ static\_data=false}}
-\func{}{wxImage}{\param{const wxString\& }{name}, \param{long}{ type = wxBITMAP\_TYPE\_ANY}}
+Creates an image from given data with the given width and height. If
+{\it static\_data} is true, then wxImage will not delete the actual
+image data in its destructor, otherwise it will free it by calling
+{\it free()}.
-\func{}{wxImage}{\param{const wxString\& }{name}, \param{const wxString\&}{ mimetype}}
+\func{}{wxImage}{\param{const wxString\& }{name}, \param{long}{ type = wxBITMAP\_TYPE\_ANY}, \param{int}{ index = -1}}
+
+\func{}{wxImage}{\param{const wxString\& }{name}, \param{const wxString\&}{ mimetype}, \param{int}{ index = -1}}
Loads an image from a file.
-\func{}{wxImage}{\param{wxInputStream\& }{stream}, \param{long}{ type = wxBITMAP\_TYPE\_ANY}}
+\func{}{wxImage}{\param{wxInputStream\& }{stream}, \param{long}{ type = wxBITMAP\_TYPE\_ANY}, \param{int}{ index = -1}}
-\func{}{wxImage}{\param{wxInputStream\& }{stream}, \param{const wxString\&}{ mimetype}}
+\func{}{wxImage}{\param{wxInputStream\& }{stream}, \param{const wxString\&}{ mimetype}, \param{int}{ index = -1}}
Loads an image from an input stream.
\twocolwidtha{5cm}%
\begin{twocollist}
-\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_BMP}}}{Load a Windows bitmap file.}
-\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_GIF}}}{Load a GIF bitmap file.}
-\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_JPEG}}}{Load a JPEG bitmap file.}
-\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_PNG}}}{Load a PNG bitmap file.}
-\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_PCX}}}{Load a PCX bitmap file.}
-\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_PNM}}}{Load a PNM bitmap file.}
-\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_TIF}}}{Load a TIFF bitmap file.}
-\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_ANY}}}{Will try to autodetect the format.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_BMP}}{Load a Windows bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_GIF}}{Load a GIF bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_JPEG}}{Load a JPEG bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_PNG}}{Load a PNG bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_PCX}}{Load a PCX bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_PNM}}{Load a PNM bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_TIF}}{Load a TIFF bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_XPM}}{Load a XPM bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_ICO}}{Load a Windows icon file (ICO).}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_CUR}}{Load a Windows cursor file (CUR).}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_ANI}}{Load a Windows animated cursor file (ANI).}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_ANY}}{Will try to autodetect the format.}
\end{twocollist}}
\docparam{mimetype}{MIME type string (for example 'image/jpeg')}
+\docparam{index}{Index of the image to load in the case that the image file contains multiple images.
+This is only used by GIF, ICO and TIFF handlers. The default value (-1) means
+"choose the default image" and is interpreted as the first image (index=0) by
+the GIF and TIFF handler and as the largest and most colourful one by the ICO handler.}
+
\wxheading{Remarks}
-Depending on how wxWindows has been configured, not all formats may be available.
+Depending on how wxWidgets has been configured, not all formats may be available.
Note: any handler other than BMP must be previously
initialized with \helpref{wxImage::AddHandler}{wximageaddhandler} or
\helpref{wxInitAllImageHandlers}{wxinitallimagehandlers}.
+Note: you can use \helpref{GetOptionInt}{wximagegetoptionint} to get the
+hotspot for loaded cursor file:
+\begin{verbatim}
+ int hotspot_x = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X);
+ int hotspot_y = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y);
+
+\end{verbatim}
+
\wxheading{See also}
\helpref{wxImage::LoadFile}{wximageloadfile}
\end{twocollist}}
}
+\perlnote{Constructors supported by wxPerl are:\par
+\begin{itemize}
+\item{Wx::Image->new( bitmap )}
+\item{Wx::Image->new( icon )}
+\item{Wx::Image->new( width, height )}
+\item{Wx::Image->new( width, height, data )}
+\item{Wx::Image->new( file, type, index )}
+\item{Wx::Image->new( file, mimetype, index )}
+\item{Wx::Image->new( stream, type, index )}
+\item{Wx::Image->new( stream, mimetype, index )}
+\end{itemize}
+}
+
\membersection{wxImage::\destruct{wxImage}}
\func{}{\destruct{wxImage}}{\void}
\helpref{wxImageHandler}{wximagehandler}
-\pythonnote{In wxPython this static method is named {\tt wxImage_AddHandler}.}
+\func{bool}{CanRead}{\param{const wxString\&}{ filename}}
+
+returns true if the current image handlers can read this file
+
+\pythonnote{In wxPython this static method is named {\tt wxImage\_AddHandler}.}
\membersection{wxImage::CleanUpHandlers}
\func{static void}{CleanUpHandlers}{\void}
Deletes all image handlers.
-This function is called by wxWindows on exit.
+This function is called by wxWidgets on exit.
+
+\membersection{wxImage::ComputeHistogram}\label{wximagecomputehistogram}
+
+\constfunc{unsigned long}{ComputeHistogram}{\param{wxImageHistogram\& }{histogram}}
+
+Computes the histogram of the image. {\it histogram} is a reference to
+wxImageHistogram object. wxImageHistogram is a specialization of
+\helpref{wxHashMap}{wxhashmap} "template" and is defined as follows:
+
+\begin{verbatim}
+class WXDLLEXPORT wxImageHistogramEntry
+{
+public:
+ wxImageHistogramEntry() : index(0), value(0) {}
+ unsigned long index;
+ unsigned long value;
+};
+
+WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
+ wxIntegerHash, wxIntegerEqual,
+ wxImageHistogram);
+\end{verbatim}
+
+\wxheading{Return value}
+
+Returns number of colours in the histogram.
\membersection{wxImage::ConvertToBitmap}\label{wximageconverttobitmap}
\constfunc{wxBitmap}{ConvertToBitmap}{\void}
-Converts the image to a platform-specific bitmap object. This has to be done
-to actually display an image as you cannot draw an image directly on a window.
-The resulting bitmap will use the colour depth of the current system which entails
-that a colour reduction has to take place.
+Deprecated, use equivalent \helpref{wxBitmap constructor}{wxbitmapconstr}
+(which takes wxImage and depth as its arguments) instead.
-When in 8-bit mode (PseudoColour mode), the GTK port will use a color cube created
-on program start-up to look up colors. This ensures a very fast conversion, but
-the image quality won't be perfect (and could be better for photo images using more
-sophisticated dithering algorithms).
+\membersection{wxImage::ConvertToMono}\label{wxbitmapconverttomono}
+
+\constfunc{wxImage}{ConvertToMono}{\param{unsigned char}{ r}, \param{unsigned char}{ g}, \param{unsigned char}{ b}}
+
+Returns monochromatic version of the image. The returned image has white
+colour where the original has {\it (r,g,b)} colour and black colour
+everywhere else.
+
+\membersection{wxImage::Copy}\label{wximagecopy}
+
+\constfunc{wxImage}{Copy}{\void}
+
+Returns an identical copy of the image.
\membersection{wxImage::Create}\label{wximagecreate}
-\func{bool}{Create}{\param{int}{ width}, \param{int}{ height}}
+\func{bool}{Create}{\param{int}{ width}, \param{int}{ height}, \param{bool}{ clear=true}}
-Creates a fresh image.
+Creates a fresh image. If {\it clear} is true, the new image will be initialized to black.
+Otherwise, the image data will be uninitialized.
\wxheading{Parameters}
\wxheading{Return value}
-TRUE if the call succeeded, FALSE otherwise.
+true if the call succeeded, false otherwise.
\membersection{wxImage::Destroy}\label{wximagedestroy}
Destroys the image data.
+\membersection{wxImage::FindFirstUnusedColour}\label{wximagefindfirstunusedcolour}
+
+\func{bool}{FindFirstUnusedColour}{\param{unsigned char *}{ r}, \param{unsigned char *}{ g}, \param{unsigned char *}{ b}, \param{unsigned char}{ startR = 1}, \param{unsigned char}{ startG = 0}, \param{unsigned char}{ startB = 0}}
+
+\wxheading{Parameters}
+
+\docparam{r,g,b}{Pointers to variables to save the colour.}
+
+\docparam{startR,startG,startB}{Initial values of the colour. Returned colour
+will have RGB values equal to or greater than these.}
+
+Finds the first colour that is never used in the image. The search begins at
+given initial colour and continues by increasing R, G and B components (in this
+order) by 1 until an unused colour is found or the colour space exhausted.
+
+\wxheading{Return value}
+
+Returns false if there is no unused colour left, true on success.
+
+\wxheading{Notes}
+
+Note that this method involves computing the histogram, which is
+computationally intensive operation.
+
\membersection{wxImage::FindHandler}
\func{static wxImageHandler*}{FindHandler}{\param{const wxString\& }{name}}
\helpref{wxImageHandler}{wximagehandler}
+\membersection{wxImage::GetImageExtWildcard}
+
+\func{static wxString}{GetImageExtWildcard}{\void}
+
+Iterates all registered wxImageHandler objects, and returns a string containing file extension masks
+suitable for passing to file open/save dialog boxes.
+
+\wxheading{Return value}
+
+The format of the returned string is "(*.ext1;*.ext2)|*.ext1;*.ext2".
+
+It is usually a good idea to prepend a description before passing the result to the dialog.
+
+Example:
+
+\begin{verbatim}
+ wxFileDialog FileDlg( this, "Choose Image", ::wxGetWorkingDirectory(), "", _("Image Files ") + wxImage::GetImageExtWildcard(), wxOPEN );
+\end{verbatim}
+
+\wxheading{See also}
+
+\helpref{wxImageHandler}{wximagehandler}
+
+\membersection{wxImage::GetAlpha}\label{wximagegetalpha}
+
+\constfunc{unsigned char}{GetAlpha}{\param{int}{ x}, \param{int}{ y}}
+
+Returns the alpha value for the given pixel. This function may only be called
+for the images with alpha channel, use \helpref{HasAlpha}{wximagehasalpha} to
+check for this.
+
+The returned value is the {\it opacity} of the image, i.e. the value of $0$
+corresponds to the transparent pixels while the value of $255$ -- to the opaque
+ones.
+
+\constfunc{unsigned char *}{GetAlpha}{\void}
+
+Returns pointer to the array storing the alpha values for this image. This
+pointer is {\tt NULL} for the images without the alpha channel. If the image
+does have it, this pointer may be used to directly manipulate the alpha values
+which are stored as the \helpref{RGB}{wximagegetdata} ones.
+
\membersection{wxImage::GetBlue}\label{wximagegetblue}
\constfunc{unsigned char}{GetBlue}{\param{int}{ x}, \param{int}{ y}}
Returns the image data as an array. This is most often used when doing
direct image manipulation. The return value points to an array of
-chararcters in RGBGBRGB... format.
+characters in RGBRGBRGB$\ldots$ format in the top-to-bottom, left-to-right
+order, that is the first RGB triplet corresponds to the pixel $(0, 0)$, the
+second one --- to $(0, 1)$ and so on.
+
+You should not delete the returned pointer nor pass it to
+\helpref{wxImage::SetData}{wximagesetdata}.
\membersection{wxImage::GetGreen}\label{wximagegetgreen}
Returns the green intensity at the given coordinate.
-\membersection{wxImage::GetRed}\label{wximagegetred}
+\membersection{wxImage::GetImageCount}\label{wximagegetimagecount}
-\constfunc{unsigned char}{GetRed}{\param{int}{ x}, \param{int}{ y}}
+\func{static int}{GetImageCount}{\param{const wxString\&}{ filename}, \param{long}{ type = wxBITMAP\_TYPE\_ANY}}
-Returns the red intensity at the given coordinate.
+\func{static int}{GetImageCount}{\param{wxInputStream\&}{ stream}, \param{long}{ type = wxBITMAP\_TYPE\_ANY}}
+
+If the image file contains more than one image and the image handler is capable
+of retrieving these individually, this function will return the number of
+available images.
+
+\docparam{name}{Name of the file to query.}
+
+\docparam{stream}{Opened input stream with image data. Currently, the stream must support seeking.}
+
+\docparam{type}{May be one of the following:
+
+\twocolwidtha{5cm}%
+\begin{twocollist}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_BMP}}{Load a Windows bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_GIF}}{Load a GIF bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_JPEG}}{Load a JPEG bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_PNG}}{Load a PNG bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_PCX}}{Load a PCX bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_PNM}}{Load a PNM bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_TIF}}{Load a TIFF bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_XPM}}{Load a XPM bitmap file.}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_ICO}}{Load a Windows icon file (ICO).}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_CUR}}{Load a Windows cursor file (CUR).}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_ANI}}{Load a Windows animated cursor file (ANI).}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_ANY}}{Will try to autodetect the format.}
+\end{twocollist}}
+
+\wxheading{Return value}
+
+Number of available images. For most image handlers, this is 1 (exceptions
+are TIFF and ICO formats).
\membersection{wxImage::GetHandlers}
Gets the red value of the mask colour.
+\membersection{wxImage::GetPalette}\label{wximagegetpalette}
+
+\constfunc{const wxPalette\&}{GetPalette}{\void}
+
+Returns the palette associated with the image. Currently the palette is only
+used when converting to wxBitmap under Windows.
+
+Eventually wxImage handlers will set the palette if one exists in the image file.
+
+\membersection{wxImage::GetRed}\label{wximagegetred}
+
+\constfunc{unsigned char}{GetRed}{\param{int}{ x}, \param{int}{ y}}
+
+Returns the red intensity at the given coordinate.
+
\membersection{wxImage::GetSubImage}\label{wximagegetsubimage}
\constfunc{wxImage}{GetSubImage}{\param{const wxRect\&}{ rect}}
\helpref{wxImage::GetHeight}{wximagegetheight}
+\membersection{wxImage::HasAlpha}\label{wximagehasalpha}
+
+\constfunc{bool}{HasAlpha}{\void}
+
+Returns true if this image has alpha channel, false otherwise.
+
+\wxheading{See also}
+
+\helpref{GetAlpha}{wximagegetalpha}, \helpref{SetAlpha}{wximagesetalpha}
+
\membersection{wxImage::HasMask}\label{wximagehasmask}
\constfunc{bool}{HasMask}{\void}
-Returns TRUE if there is a mask active, FALSE otherwise.
+Returns true if there is a mask active, false otherwise.
+
+\membersection{wxImage::GetOption}\label{wximagegetoption}
+
+\constfunc{wxString}{GetOption}{\param{const wxString\&}{ name}}
+
+Gets a user-defined option. The function is case-insensitive to {\it name}.
+
+For example, when saving as a JPEG file, the option {\bf quality} is
+used, which is a number between 0 and 100 (0 is terrible, 100 is very good).
+
+\wxheading{See also}
+
+\helpref{wxImage::SetOption}{wximagesetoption},\rtfsp
+\helpref{wxImage::GetOptionInt}{wximagegetoptionint},\rtfsp
+\helpref{wxImage::HasOption}{wximagehasoption}
+
+\membersection{wxImage::GetOptionInt}\label{wximagegetoptionint}
+
+\constfunc{int}{GetOptionInt}{\param{const wxString\&}{ name}}
+
+Gets a user-defined option as an integer. The function is case-insensitive to {\it name}.
+
+\wxheading{See also}
+
+\helpref{wxImage::SetOption}{wximagesetoption},\rtfsp
+\helpref{wxImage::GetOption}{wximagegetoption},\rtfsp
+\helpref{wxImage::HasOption}{wximagehasoption}
+
+\membersection{wxImage::HasOption}\label{wximagehasoption}
+
+\constfunc{bool}{HasOption}{\param{const wxString\&}{ name}}
+
+Returns true if the given option is present. The function is case-insensitive to {\it name}.
+
+\wxheading{See also}
+
+\helpref{wxImage::SetOption}{wximagesetoption},\rtfsp
+\helpref{wxImage::GetOption}{wximagegetoption},\rtfsp
+\helpref{wxImage::GetOptionInt}{wximagegetoptionint}
\membersection{wxImage::InitStandardHandlers}
Internal use only. Adds standard image format handlers. It only install BMP
for the time being, which is used by wxBitmap.
-This function is called by wxWindows on startup, and shouldn't be called by
+This function is called by wxWidgets on startup, and shouldn't be called by
the user.
\wxheading{See also}
\membersection{wxImage::LoadFile}\label{wximageloadfile}
-\func{bool}{LoadFile}{\param{const wxString\&}{ name}, \param{long}{ type = wxBITMAP\_TYPE\_ANY}}
+\func{bool}{LoadFile}{\param{const wxString\&}{ name}, \param{long}{ type = wxBITMAP\_TYPE\_ANY}, \param{int}{ index = -1}}
-\func{bool}{LoadFile}{\param{const wxString\&}{ name}, \param{const wxString\&}{ mimetype}}
+\func{bool}{LoadFile}{\param{const wxString\&}{ name}, \param{const wxString\&}{ mimetype}, \param{int}{ index = -1}}
Loads an image from a file. If no handler type is provided, the library will
try to autodetect the format.
-\func{bool}{LoadFile}{\param{wxInputStream\&}{ stream}, \param{long}{ type}}
+\func{bool}{LoadFile}{\param{wxInputStream\&}{ stream}, \param{long}{ type}, \param{int}{ index = -1}}
-\func{bool}{LoadFile}{\param{wxInputStream\&}{ stream}, \param{const wxString\&}{ mimetype}}
+\func{bool}{LoadFile}{\param{wxInputStream\&}{ stream}, \param{const wxString\&}{ mimetype}, \param{int}{ index = -1}}
Loads an image from an input stream.
\twocolitem{{\bf wxBITMAP\_TYPE\_PNG}}{Load a PNG image file.}
\twocolitem{{\bf wxBITMAP\_TYPE\_PNM}}{Load a PNM image file.}
\twocolitem{{\bf wxBITMAP\_TYPE\_TIF}}{Load a TIFF image file.}
+\twocolitem{{\bf wxBITMAP\_TYPE\_XPM}}{Load a XPM image file.}
+\twocolitem{{\bf wxBITMAP\_TYPE\_ICO}}{Load a Windows icon file (ICO).}
+\twocolitem{{\bf wxBITMAP\_TYPE\_CUR}}{Load a Windows cursor file (CUR).}
+\twocolitem{\indexit{wxBITMAP\_TYPE\_ANI}}{Load a Windows animated cursor file (ANI).}
\twocolitem{{\bf wxBITMAP\_TYPE\_ANY}}{Will try to autodetect the format.}
\end{twocollist}}
\docparam{mimetype}{MIME type string (for example 'image/jpeg')}
+\docparam{index}{Index of the image to load in the case that the image file contains multiple images.
+This is only used by GIF, ICO and TIFF handlers. The default value (-1) means
+"choose the default image" and is interpreted as the first image (index=0) by
+the GIF and TIFF handler and as the largest and most colourful one by the ICO handler.}
+
\wxheading{Remarks}
-Depending on how wxWindows has been configured, not all formats may be available.
+Depending on how wxWidgets has been configured, not all formats may be available.
+
+Note: you can use \helpref{GetOptionInt}{wximagegetoptionint} to get the
+hotspot for loaded cursor file:
+\begin{verbatim}
+ int hotspot_x = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X);
+ int hotspot_y = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y);
+
+\end{verbatim}
\wxheading{Return value}
-TRUE if the operation succeeded, FALSE otherwise.
+true if the operation succeeded, false otherwise. If the optional index parameter is out of range,
+false is returned and a call to wxLogError() takes place.
\wxheading{See also}
\end{twocollist}}
}
+\perlnote{Methods supported by wxPerl are:\par
+\begin{itemize}
+\item{bitmap->LoadFile( name, type )}
+\item{bitmap->LoadFile( name, mimetype )}
+\end{itemize}
+}
+
\membersection{wxImage::Ok}\label{wximageok}
\constfunc{bool}{Ok}{\void}
-Returns TRUE if image data is present.
+Returns true if image data is present.
\membersection{wxImage::RemoveHandler}
\wxheading{Return value}
-TRUE if the handler was found and removed, FALSE otherwise.
+true if the handler was found and removed, false otherwise.
\wxheading{See also}
\helpref{wxImageHandler}{wximagehandler}
+\membersection{wxImage::Mirror}\label{wximagemirror}
+
+\constfunc{wxImage}{Mirror}{\param{bool}{ horizontally = true}}
+
+Returns a mirrored copy of the image. The parameter {\it horizontally}
+indicates the orientation.
+
+\membersection{wxImage::Replace}\label{wximagereplace}
+
+\func{void}{Replace}{\param{unsigned char}{ r1}, \param{unsigned char}{ g1}, \param{unsigned char}{ b1},
+\param{unsigned char}{ r2}, \param{unsigned char}{ g2}, \param{unsigned char}{ b2}}
+
+Replaces the colour specified by {\it r1,g1,b1} by the colour {\it r2,g2,b2}.
+
+\membersection{wxImage::Rescale}\label{wximagerescale}
+
+\func{wxImage \&}{Rescale}{\param{int}{ width}, \param{int}{ height}}
+
+Changes the size of the image in-place: after a call to this function, the
+image will have the given width and height.
+
+Returns the (modified) image itself.
+
+\wxheading{See also}
+
+\helpref{Scale}{wximagescale}
+
+\membersection{wxImage::Rotate}\label{wximagerotate}
+
+\func{wxImage}{Rotate}{\param{double}{ angle}, \param{const wxPoint\& }{rotationCentre},
+ \param{bool}{ interpolating = true}, \param{wxPoint*}{ offsetAfterRotation = NULL}}
+
+Rotates the image about the given point, by {\it angle} radians. Passing true
+to {\it interpolating} results in better image quality, but is slower. If the
+image has a mask, then the mask colour is used for the uncovered pixels in the
+rotated image background. Else, black (rgb 0, 0, 0) will be used.
+
+Returns the rotated image, leaving this image intact.
+
+\membersection{wxImage::Rotate90}\label{wximagerotate90}
+
+\constfunc{wxImage}{Rotate90}{\param{bool}{ clockwise = true}}
+
+Returns a copy of the image rotated 90 degrees in the direction
+indicated by {\it clockwise}.
+
\membersection{wxImage::SaveFile}\label{wximagesavefile}
-\func{bool}{SaveFile}{\param{const wxString\& }{name}, \param{int}{ type}}
+\constfunc{bool}{SaveFile}{\param{const wxString\& }{name}, \param{int}{ type}}
+
+\constfunc{bool}{SaveFile}{\param{const wxString\& }{name}, \param{const wxString\&}{ mimetype}}
-\func{bool}{SaveFile}{\param{const wxString\& }{name}, \param{const wxString\&}{ mimetype}}
+Saves an image in the named file.
-Saves a image in the named file.
+\constfunc{bool}{SaveFile}{\param{const wxString\& }{name}}
-\func{bool}{SaveFile}{\param{wxOutputStream\& }{stream}, \param{int}{ type}}
+Saves an image in the named file. File type is determined from the extension of the
+file name. Note that this function may fail if the extension is not recognized! You
+can use one of the forms above to save images to files with non-standard extensions.
-\func{bool}{SaveFile}{\param{wxOutputStream\& }{stream}, \param{const wxString\&}{ mimetype}}
+\constfunc{bool}{SaveFile}{\param{wxOutputStream\& }{stream}, \param{int}{ type}}
-Saves a image in the given stream.
+\constfunc{bool}{SaveFile}{\param{wxOutputStream\& }{stream}, \param{const wxString\&}{ mimetype}}
+
+Saves an image in the given stream.
\wxheading{Parameters}
\docparam{stream}{Opened output stream to save the image to.}
-\docparam{type}{Currently three types can be used:
+\docparam{type}{Currently these types can be used:
\twocolwidtha{5cm}%
\begin{twocollist}
+\twocolitem{{\bf wxBITMAP\_TYPE\_BMP}}{Save a BMP image file.}
\twocolitem{{\bf wxBITMAP\_TYPE\_JPEG}}{Save a JPEG image file.}
\twocolitem{{\bf wxBITMAP\_TYPE\_PNG}}{Save a PNG image file.}
\twocolitem{{\bf wxBITMAP\_TYPE\_PCX}}{Save a PCX image file (tries to save as 8-bit if possible, falls back to 24-bit otherwise).}
\twocolitem{{\bf wxBITMAP\_TYPE\_PNM}}{Save a PNM image file (as raw RGB always).}
-\twocolitem{{\bf wxBITMAP\_TYPE\_TIF}}{Save a TIFF image file.}
+\twocolitem{{\bf wxBITMAP\_TYPE\_TIFF}}{Save a TIFF image file.}
+\twocolitem{{\bf wxBITMAP\_TYPE\_XPM}}{Save a XPM image file.}
+\twocolitem{{\bf wxBITMAP\_TYPE\_ICO}}{Save a Windows icon file (ICO) (the size may be up to 255 wide by 127 high. A single image is saved in 8 colors at the size supplied).}
+\twocolitem{{\bf wxBITMAP\_TYPE\_CUR}}{Save a Windows cursor file (CUR).}
\end{twocollist}}
\docparam{mimetype}{MIME type.}
\wxheading{Return value}
-TRUE if the operation succeeded, FALSE otherwise.
+true if the operation succeeded, false otherwise.
\wxheading{Remarks}
-Depending on how wxWindows has been configured, not all formats may be available.
+Depending on how wxWidgets has been configured, not all formats may be available.
+
+Note: you can use \helpref{GetOptionInt}{wximagegetoptionint} to set the
+hotspot before saving an image into a cursor file (default hotspot is in
+the centre of the image):
+\begin{verbatim}
+ image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, hotspotX);
+ image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, hotspotY);
+
+\end{verbatim}
\wxheading{See also}
\end{twocollist}}
}
-\membersection{wxImage::Replace}\label{wximagereplace}
-
-\func{void}{Replace}{\param{unsigned char}{ r1}, \param{unsigned char}{ g1}, \param{unsigned char}{ b1},
-\param{unsigned char}{ r2}, \param{unsigned char}{ g2}, \param{unsigned char}{ b2}}
-
-Replaces the colour specified by {\it r1,g1,b1} by the colour {\it r2,g2,b2}.
-
-\membersection{wxImage::Rescale}\label{wximagerescale}
-
-\func{wxImage \&}{Rescale}{\param{int}{ width}, \param{int}{ height}}
-
-Changes the size of the image in-place: after a call to this function, the
-image will have the given width and height.
-
-Returns the (modified) image itself.
-
-\wxheading{See also}
-
-\helpref{Scale}{wximagescale}
-
-\membersection{wxImage::Rotate}\label{wximagerotate}
-
-\func{wxImage}{Rotate}{\param{double}{ angle}, \param{const wxPoint\& }{rotationCentre},
- \param{bool}{ interpolating = TRUE}, \param{wxPoint*}{ offsetAfterRotation = NULL}}
-
-Rotates the image about the given point, by {\it angle} radians. Passing TRUE
-to {\it interpolating} results in better image quality, but is slower. If the
-image has a mask, then the mask colour is used for the uncovered pixels in the
-rotated image background. Else, black (rgb 0, 0, 0) will be used.
-
-Returns the rotated image, leaving this image intact.
+\perlnote{Methods supported by wxPerl are:\par
+\begin{itemize}
+\item{bitmap->SaveFile( name, type )}
+\item{bitmap->SaveFile( name, mimetype )}
+\end{itemize}
+}
\membersection{wxImage::Scale}\label{wximagescale}
is to blit a wxMemoryDC into another wxMemoryDC.
It may be mentioned that the GTK port uses this function internally
-to scale bitmaps when using mapping mode in wxDC.
+to scale bitmaps when using mapping modes in wxDC.
Example:
// rescale it to have size of 32*32
if ( bmp.GetWidth() != 32 || bmp.GetHeight() != 32 )
{
- wxImage image(bmp);
- bmp = image.Scale(32, 32).ConvertToBitmap();
+ wxImage image = bmp.ConvertToImage();
+ bmp = wxBitmap(image.Scale(32, 32));
// another possibility:
image.Rescale(32, 32);
\helpref{Rescale}{wximagerescale}
+\membersection{wxImage::SetAlpha}\label{wximagesetalpha}
+
+\func{void}{SetAlpha}{\param{unsigned char *}{alpha = {\tt NULL}}}
+
+This function is similar to \helpref{SetData}{wximagesetdata} and has similar
+restrictions. The pointer passed to it may however be {\tt NULL} in which case
+the function will allocate the alpha array internally -- this is useful to add
+alpha channel data to an image which doesn't have any. If the pointer is not
+{\tt NULL}, it must have one byte for each image pixel and be allocated with
+{\tt malloc()}. wxImage takes ownership of the pointer and will free it.
+
+\func{void}{SetAlpha}{\param{int }{x}, \param{int }{y}, \param{unsigned char }{alpha}}
+
+Sets the alpha value for the given pixel. This function should only be called
+if the image has alpha channel data, use \helpref{HasAlpha}{wximagehasalpha} to
+check for this.
+
\membersection{wxImage::SetData}\label{wximagesetdata}
\func{void}{SetData}{\param{unsigned char*}{data}}
the size (width*height*3) or results will be unexpected. Don't use this
method if you aren't sure you know what you are doing.
+The data must have been allocated with {\tt malloc()}, {\large {\bf NOT}} with
+{\tt operator new}.
+
+After this call the pointer to the data is owned by the wxImage object,
+that will be responsible for deleting it.
+Do not pass to this function a pointer obtained through
+\helpref{wxImage::GetData}{wximagegetdata}.
+
\membersection{wxImage::SetMask}\label{wximagesetmask}
-\func{void}{SetMask}{\param{bool}{ hasMask = TRUE}}
+\func{void}{SetMask}{\param{bool}{ hasMask = true}}
Specifies whether there is a mask or not. The area of the mask is determined by the current mask colour.
\membersection{wxImage::SetMaskColour}\label{wximagesetmaskcolour}
-\func{void}{SetMaskColour}{\param{unsigned char }{red}, \param{unsigned char }{blue}, \param{unsigned char }{green}}
+\func{void}{SetMaskColour}{\param{unsigned char }{red}, \param{unsigned char }{green}, \param{unsigned char }{blue}}
Sets the mask colour for this image (and tells the image to use the mask).
+\membersection{wxImage::SetMaskFromImage}\label{wximagesetmaskfromimage}
+
+\func{bool}{SetMaskFromImage}{\param{const wxImage\&}{ mask}, \param{unsigned char}{ mr}, \param{unsigned char}{ mg}, \param{unsigned char}{ mb}}
+
+\wxheading{Parameters}
+
+\docparam{mask}{The mask image to extract mask shape from. Must have same dimensions as the image.}
+
+\docparam{mr,mg,mb}{RGB value of pixels in {\it mask} that will be used to create the mask.}
+
+Sets image's mask so that the pixels that have RGB value of {\it mr,mg,mb}
+in {\it mask} will be masked in the image. This is done by first finding an
+unused colour in the image, setting this colour as the mask colour and then
+using this colour to draw all pixels in the image who corresponding pixel
+in {\it mask} has given RGB value.
+
+\wxheading{Return value}
+
+Returns false if {\it mask} does not have same dimensions as the image or if
+there is no unused colour left. Returns true if the mask was successfully
+applied.
+
+\wxheading{Notes}
+
+Note that this method involves computing the histogram, which is
+computationally intensive operation.
+
+\membersection{wxImage::SetOption}\label{wximagesetoption}
+
+\func{void}{SetOption}{\param{const wxString\&}{ name}, \param{const wxString\&}{ value}}
+
+\func{void}{SetOption}{\param{const wxString\&}{ name}, \param{int}{ value}}
+
+Sets a user-defined option. The function is case-insensitive to {\it name}.
+
+For example, when saving as a JPEG file, the option {\bf quality} is
+used, which is a number between 0 and 100 (0 is terrible, 100 is very good).
+
+\wxheading{See also}
+
+\helpref{wxImage::GetOption}{wximagegetoption},\rtfsp
+\helpref{wxImage::GetOptionInt}{wximagegetoptionint},\rtfsp
+\helpref{wxImage::HasOption}{wximagehasoption}
+
+\membersection{wxImage::SetPalette}\label{wximagesetpalette}
+
+\func{void}{SetPalette}{\param{const wxPalette\&}{ palette}}
+
+Associates a palette with the image. The palette may be used when converting
+wxImage to wxBitmap (MSW only at present) or in file save operations (none as yet).
+
\membersection{wxImage::SetRGB}\label{wximagesetrgb}
-\func{void}{SetRGB}{\param{int }{x}, \param{int }{y}, \param{unsigned char }{red}, \param{unsigned char }{blue}, \param{unsigned char }{green}}
+\func{void}{SetRGB}{\param{int }{x}, \param{int }{y}, \param{unsigned char }{red}, \param{unsigned char }{green}, \param{unsigned char }{blue}}
Sets the pixel at the given coordinate. This routine performs bounds-checks
for the coordinate so it can be considered a safe way to manipulate the
\membersection{wxImage::operator $==$}
-\func{bool}{operator $==$}{\param{const wxImage\& }{image}}
+\constfunc{bool}{operator $==$}{\param{const wxImage\& }{image}}
Equality operator. This operator tests whether the internal data pointers are
equal (a fast test).
\wxheading{Return value}
-Returns TRUE if the images were effectively equal, FALSE otherwise.
+Returns true if the images were effectively equal, false otherwise.
\membersection{wxImage::operator $!=$}
-\func{bool}{operator $!=$}{\param{const wxImage\& }{image}}
+\constfunc{bool}{operator $!=$}{\param{const wxImage\& }{image}}
Inequality operator. This operator tests whether the internal data pointers are
unequal (a fast test).
\wxheading{Return value}
-Returns TRUE if the images were unequal, FALSE otherwise.
+Returns true if the images were unequal, false otherwise.
\section{\class{wxImageHandler}}\label{wximagehandler}
This software is based in part on the work of the Independent JPEG Group.
-(Applies when wxWindows is linked with JPEG support. wxJPEGHandler uses libjpeg
+(Applies when wxWidgets is linked with JPEG support. wxJPEGHandler uses libjpeg
created by IJG.)
\wxheading{Derived from}
\wxheading{Return value}
-Number of available images. For most image handles, this defaults to 1.
+Number of available images. For most image handlers, this is 1 (exceptions
+are TIFF and ICO formats).
\membersection{wxImageHandler::GetType}
\membersection{wxImageHandler::LoadFile}\label{wximagehandlerloadfile}
-\func{bool}{LoadFile}{\param{wxImage* }{image}, \param{wxInputStream\&}{ stream}, \param{bool}{ verbose=TRUE}, \param{int}{ index=0}}
+\func{bool}{LoadFile}{\param{wxImage* }{image}, \param{wxInputStream\&}{ stream}, \param{bool}{ verbose=true}, \param{int}{ index=0}}
Loads a image from a stream, putting the resulting data into {\it image}. If the image file contains
more than one image and the image handler is capable of retrieving these individually, {\it index}
\docparam{stream}{Opened input stream for reading image data.}
-\docparam{verbose}{If set to TRUE, errors reported by the image handler will produce wxLogMessages.}
+\docparam{verbose}{If set to true, errors reported by the image handler will produce wxLogMessages.}
\docparam{index}{The index of the image in the file (starting from zero).}
\wxheading{Return value}
-TRUE if the operation succeeded, FALSE otherwise.
+true if the operation succeeded, false otherwise.
\wxheading{See also}
\wxheading{Return value}
-TRUE if the operation succeeded, FALSE otherwise.
+true if the operation succeeded, false otherwise.
\wxheading{See also}
\docparam{extension}{Handler extension.}
-\membersection{wxImageHandler::SetType}
+\membersection{wxImageHandler::SetMimeType}\label{wximagehandlersetmimetype}
-\func{void}{SetType}{\param{long }{type}}
+\func{void}{SetMimeType}{\param{const wxString\& }{mimetype}}
-Sets the handler type.
+Sets the handler MIME type.
\wxheading{Parameters}
-\docparam{name}{Handler type.}
-
+\docparam{mimename}{Handler MIME type.}
-\membersection{wxImageHandler::SetMimeType}
+\membersection{wxImageHandler::SetType}
-\func{void}{SetMimeType}{\param{const wxString\& }{mimetype}}
+\func{void}{SetType}{\param{long }{type}}
-Sets the handler MIME type.
+Sets the handler type.
\wxheading{Parameters}
-\docparam{mimename}{Handler MIME type.}
+\docparam{name}{Handler type.}
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