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 $255$
+it also stores a byte representing the pixel opacity. An alpha value of $0$
+corresponds to a transparent pixel (null opacity) while a value of $255$
means that the pixel is 100\% opaque.
-Unlike the RGB data, not all images have the alpha channel and before using
+Unlike RGB data, not all images have an 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).
+an alpha channel with \helpref{HasAlpha}{wximagehasalpha}. Note that currently only
+images loaded from PNG files with transparency information will have an alpha
+channel but alpha support will be added to the other formats as well (as well
+as support for saving images with alpha channel which also isn't implemented).
\wxheading{Available image handlers}
\latexignore{\rtfignore{\wxheading{Members}}}
+
\membersection{wxImage::wxImage}\label{wximagector}
\func{}{wxImage}{\void}
Loads an image from an input stream.
+\func{}{wxImage}{\param{const char** }{xpmData}}
+
+Creates an image from XPM data.
+
\wxheading{Parameters}
\docparam{width}{Specifies the width of the image.}
"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.}
+\docparam{xpmData}{A pointer to XPM image data.}
+
\wxheading{Remarks}
Depending on how wxWidgets has been configured, not all formats may be available.
\end{itemize}
}
+
\membersection{wxImage::\destruct{wxImage}}\label{wximagedtor}
\func{}{\destruct{wxImage}}{\void}
Destructor.
+
\membersection{wxImage::AddHandler}\label{wximageaddhandler}
\func{static void}{AddHandler}{\param{wxImageHandler*}{ handler}}
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}\label{wximagecleanuphandlers}
\func{static void}{CleanUpHandlers}{\void}
This function is called by wxWidgets on exit.
+
\membersection{wxImage::ComputeHistogram}\label{wximagecomputehistogram}
\constfunc{unsigned long}{ComputeHistogram}{\param{wxImageHistogram\& }{histogram}}
Returns number of colours in the histogram.
+
\membersection{wxImage::ConvertAlphaToMask}\label{wximageconvertalphatomask}
\func{bool}{ConvertAlphaToMask}{\param{unsigned char}{ threshold = 128}}
\false if FindFirstUnusedColour returns \false, \true otherwise.
+
\membersection{wxImage::ConvertToBitmap}\label{wximageconverttobitmap}
\constfunc{wxBitmap}{ConvertToBitmap}{\void}
Deprecated, use equivalent \helpref{wxBitmap constructor}{wxbitmapctor}
(which takes wxImage and depth as its arguments) instead.
+
\membersection{wxImage::ConvertToMono}\label{wxbitmapconverttomono}
\constfunc{wxImage}{ConvertToMono}{\param{unsigned char}{ r}, \param{unsigned char}{ g}, \param{unsigned char}{ b}}
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}, \param{bool}{ clear=true}}
true if the call succeeded, false otherwise.
+
\membersection{wxImage::Destroy}\label{wximagedestroy}
-\func{bool}{Destroy}{\void}
+\func{void}{Destroy}{\void}
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}}
Note that this method involves computing the histogram, which is
computationally intensive operation.
+
\membersection{wxImage::FindHandler}\label{wximagefindhandler}
\func{static wxImageHandler*}{FindHandler}{\param{const wxString\& }{name}}
\helpref{wxImageHandler}{wximagehandler}
+
\membersection{wxImage::GetImageExtWildcard}\label{wximagegetimageextwildcard}
\func{static wxString}{GetImageExtWildcard}{\void}
\helpref{wxImageHandler}{wximagehandler}
+
\membersection{wxImage::GetAlpha}\label{wximagegetalpha}
\constfunc{unsigned char}{GetAlpha}{\param{int}{ x}, \param{int}{ y}}
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 blue intensity at the given coordinate.
+
\membersection{wxImage::GetData}\label{wximagegetdata}
\constfunc{unsigned char*}{GetData}{\void}
You should not delete the returned pointer nor pass it to
\helpref{wxImage::SetData}{wximagesetdata}.
+
\membersection{wxImage::GetGreen}\label{wximagegetgreen}
\constfunc{unsigned char}{GetGreen}{\param{int}{ x}, \param{int}{ y}}
Returns the green intensity at the given coordinate.
+
\membersection{wxImage::GetImageCount}\label{wximagegetimagecount}
\func{static int}{GetImageCount}{\param{const wxString\&}{ filename}, \param{long}{ type = wxBITMAP\_TYPE\_ANY}}
Number of available images. For most image handlers, this is 1 (exceptions
are TIFF and ICO formats).
+
\membersection{wxImage::GetHandlers}\label{wximagegethandlers}
\func{static wxList\&}{GetHandlers}{\void}
\helpref{wxImageHandler}{wximagehandler}
+
\membersection{wxImage::GetHeight}\label{wximagegetheight}
\constfunc{int}{GetHeight}{\void}
Gets the height of the image in pixels.
+
\membersection{wxImage::GetMaskBlue}\label{wximagegetmaskblue}
\constfunc{unsigned char}{GetMaskBlue}{\void}
Gets the blue value of the mask colour.
+
\membersection{wxImage::GetMaskGreen}\label{wximagegetmaskgreen}
\constfunc{unsigned char}{GetMaskGreen}{\void}
Gets the green value of the mask colour.
+
\membersection{wxImage::GetMaskRed}\label{wximagegetmaskred}
\constfunc{unsigned char}{GetMaskRed}{\void}
Gets the red value of the mask colour.
+
+\membersection{wxImage::GetOrFindMaskColour}\label{wximagegetgetorsetmaskcolour}
+
+\constfunc{bool}{GetOrFindMaskColour}{\param{unsigned char}{ *r}, \param{unsigned char}{ *g}, \param{unsigned char}{ *b}}
+
+Get the current mask colour or find a suitable unused colour that could be
+used as a mask colour. Returns {\tt true} if the image currently has a mask.
+
+
\membersection{wxImage::GetPalette}\label{wximagegetpalette}
\constfunc{const wxPalette\&}{GetPalette}{\void}
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}}
Returns a sub image of the current one as long as the rect belongs entirely to
the image.
+
\membersection{wxImage::GetWidth}\label{wximagegetwidth}
\constfunc{int}{GetWidth}{\void}
\helpref{wxImage::GetHeight}{wximagegetheight}
+
\membersection{wxImage::HasAlpha}\label{wximagehasalpha}
\constfunc{bool}{HasAlpha}{\void}
\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.
+
\membersection{wxImage::GetOption}\label{wximagegetoption}
\constfunc{wxString}{GetOption}{\param{const wxString\&}{ name}}
\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}.
+If the given option is not present, the function returns $0$. Use
+\helpref{wxImage::HasOption}{wximagehasoption} is $0$ is a possibly valid value
+for the option.
+
+Options for wxPNGHandler
+\twocolwidtha{5cm}%
+\begin{twocollist}
+\twocolitem{wxIMAGE\_OPTION\_PNG\_FORMAT}{Format for saving a PNG file.}
+\twocolitem{wxIMAGE\_OPTION\_PNG\_BITDEPTH}{Bit depth for every channel (R/G/B/A).}
+\end{twocollist}
+
+Supported values for wxIMAGE\_OPTION\_PNG\_FORMAT:
+\twocolwidtha{5cm}%
+\begin{twocollist}
+\twocolitem{wxPNG\_TYPE\_COLOUR}{Stores RGB image.}
+\twocolitem{wxPNG\_TYPE\_GREY}{Stores grey image, converts from RGB.}
+\twocolitem{wxPNG\_TYPE\_GREY\_RED}{Stores grey image, uses red value as grey.}
+\end{twocollist}
+
+
\wxheading{See also}
\helpref{wxImage::SetOption}{wximagesetoption},\rtfsp
-\helpref{wxImage::GetOption}{wximagegetoption},\rtfsp
-\helpref{wxImage::HasOption}{wximagehasoption}
+\helpref{wxImage::GetOption}{wximagegetoption}
+
\membersection{wxImage::HasOption}\label{wximagehasoption}
\helpref{wxImage::GetOption}{wximagegetoption},\rtfsp
\helpref{wxImage::GetOptionInt}{wximagegetoptionint}
+
+\membersection{wxImage::InitAlpha}\label{wximageinitalpha}
+
+\func{void}{InitAlpha}{\void}
+
+Initializes the image alpha channel data. It is an error to call it
+if the image already has alpha data. If it doesn't, alpha data will be
+by default initialized to all pixels being fully opaque. But if the image has a
+a mask colour, all mask pixels will be completely transparent.
+
+
\membersection{wxImage::InitStandardHandlers}\label{wximageinitstandardhandlers}
\func{static void}{InitStandardHandlers}{\void}
\helpref{wxImageHandler}{wximagehandler},
\helpref{wxInitAllImageHandlers}{wxinitallimagehandlers}
+
\membersection{wxImage::InsertHandler}\label{wximageinserthandler}
\func{static void}{InsertHandler}{\param{wxImageHandler*}{ handler}}
\helpref{wxImageHandler}{wximagehandler}
+
\membersection{wxImage::LoadFile}\label{wximageloadfile}
\func{bool}{LoadFile}{\param{const wxString\&}{ name}, \param{long}{ type = wxBITMAP\_TYPE\_ANY}, \param{int}{ index = -1}}
}
+
\membersection{wxImage::Ok}\label{wximageok}
\constfunc{bool}{Ok}{\void}
Returns true if image data is present.
+
\membersection{wxImage::RemoveHandler}\label{wximageremovehandler}
\func{static bool}{RemoveHandler}{\param{const wxString\& }{name}}
\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},
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.
+Changes the size of the image in-place by scaling it: after a call to this function,
+the image will have the given width and height.
Returns the (modified) image itself.
\helpref{Scale}{wximagescale}
+
+\membersection{wxImage::Resize}\label{wximageresize}
+
+\func{wxImage \&}{Resize}{\param{const wxSize\&}{ size}, \param{const wxPoint&}{ pos}, \param{int}{ red = -1}, \param{int}{ green = -1}, \param{int}{ blue = -1}}
+
+Changes the size of the image in-place without scaling it by adding either a border
+with the given colour or cropping as necessary. The image is pasted into a new
+image with the given {\it size} and background colour at the position {\it pos}
+relative to the upper left of the new image. If {\it red = green = blue = -1}
+then use either the current mask colour if set or find, use, and set a
+suitable mask colour for any newly exposed areas.
+
+Returns the (modified) image itself.
+
+\wxheading{See also}
+
+\helpref{Size}{wximagesize}
+
+
\membersection{wxImage::Rotate}\label{wximagerotate}
\func{wxImage}{Rotate}{\param{double}{ angle}, \param{const wxPoint\& }{rotationCentre},
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}
\constfunc{bool}{SaveFile}{\param{const wxString\& }{name}, \param{int}{ type}}
\end{itemize}
}
+
\membersection{wxImage::Scale}\label{wximagescale}
\constfunc{wxImage}{Scale}{\param{int}{ width}, \param{int}{ height}}
\helpref{Rescale}{wximagerescale}
+
+\membersection{wxImage::Size}\label{wximagesize}
+
+\constfunc{wxImage}{Size}{\param{const wxSize\&}{ size}, \param{const wxPoint&}{ pos}, \param{int}{ red = -1}, \param{int}{ green = -1}, \param{int}{ blue = -1}}
+
+Returns a resized version of this image without scaling it by adding either a border
+with the given colour or cropping as necessary. The image is pasted into a new
+image with the given {\it size} and background colour at the position {\it pos}
+relative to the upper left of the new image. If {\it red = green = blue = -1}
+then use either the current mask colour if set or find, use, and set a
+suitable mask colour for any newly exposed areas.
+
+\wxheading{See also}
+
+\helpref{Resize}{wximageresize}
+
+
\membersection{wxImage::SetAlpha}\label{wximagesetalpha}
\func{void}{SetAlpha}{\param{unsigned char *}{alpha = {\tt NULL}}}
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}}
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}}
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 }{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}}
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}}
\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 }{green}, \param{unsigned char }{blue}}
be set directly. In that case you will have to get access to the image data
using the \helpref{GetData}{wximagegetdata} method.
+
+\membersection{wxImage::SetRGB}\label{wximagesetrgbrect}
+
+\func{void}{SetRGB}{\param{wxRect \& }{rect}, \param{unsigned char }{red}, \param{unsigned char }{green}, \param{unsigned char }{blue}}
+
+Sets the colour of the pixels within the given rectangle. This routine performs
+bounds-checks for the coordinate so it can be considered a safe way to manipulate the
+data.
+
+
\membersection{wxImage::operator $=$}\label{wximageassign}
\func{wxImage\& }{operator $=$}{\param{const wxImage\& }{image}}
Returns 'this' object.
+
\membersection{wxImage::operator $==$}\label{wximageequal}
\constfunc{bool}{operator $==$}{\param{const wxImage\& }{image}}
Returns true if the images were effectively equal, false otherwise.
+
\membersection{wxImage::operator $!=$}\label{wximagenotequal}
\constfunc{bool}{operator $!=$}{\param{const wxImage\& }{image}}
\latexignore{\rtfignore{\wxheading{Members}}}
+
\membersection{wxImageHandler::wxImageHandler}\label{wximagehandlerctor}
\func{}{wxImageHandler}{\void}
Default constructor. In your own default constructor, initialise the members
m\_name, m\_extension and m\_type.
+
\membersection{wxImageHandler::\destruct{wxImageHandler}}\label{wximagehandlerdtor}
\func{}{\destruct{wxImageHandler}}{\void}
Destroys the wxImageHandler object.
+
\membersection{wxImageHandler::GetName}\label{wximagehandlergetname}
\constfunc{wxString}{GetName}{\void}
Gets the name of this handler.
+
\membersection{wxImageHandler::GetExtension}\label{wximagehandlergetextension}
\constfunc{wxString}{GetExtension}{\void}
Gets the file extension associated with this handler.
+
\membersection{wxImageHandler::GetImageCount}\label{wximagehandlergetimagecount}
\func{int}{GetImageCount}{\param{wxInputStream\&}{ stream}}
Number of available images. For most image handlers, this is 1 (exceptions
are TIFF and ICO formats).
+
\membersection{wxImageHandler::GetType}\label{wximagehandlergettype}
\constfunc{long}{GetType}{\void}
Gets the image type associated with this handler.
+
\membersection{wxImageHandler::GetMimeType}\label{wximagehandlergetmimetype}
\constfunc{wxString}{GetMimeType}{\void}
Gets the MIME type associated with this handler.
+
\membersection{wxImageHandler::LoadFile}\label{wximagehandlerloadfile}
\func{bool}{LoadFile}{\param{wxImage* }{image}, \param{wxInputStream\&}{ stream}, \param{bool}{ verbose=true}, \param{int}{ index=0}}
\helpref{wxImage::SaveFile}{wximagesavefile},
\helpref{wxImageHandler::SaveFile}{wximagehandlersavefile}
+
\membersection{wxImageHandler::SaveFile}\label{wximagehandlersavefile}
\func{bool}{SaveFile}{\param{wxImage* }{image}, \param{wxOutputStream\& }{stream}}
\helpref{wxImage::SaveFile}{wximagesavefile},
\helpref{wxImageHandler::LoadFile}{wximagehandlerloadfile}
+
\membersection{wxImageHandler::SetName}\label{wximagehandlersetname}
\func{void}{SetName}{\param{const wxString\& }{name}}
\docparam{name}{Handler name.}
+
\membersection{wxImageHandler::SetExtension}\label{wximagehandlersetextension}
\func{void}{SetExtension}{\param{const wxString\& }{extension}}
\docparam{extension}{Handler extension.}
+
\membersection{wxImageHandler::SetMimeType}\label{wximagehandlersetmimetype}
\func{void}{SetMimeType}{\param{const wxString\& }{mimetype}}
\docparam{mimename}{Handler MIME type.}
+
\membersection{wxImageHandler::SetType}\label{wximagehandlersettype}
\func{void}{SetType}{\param{long }{type}}
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