+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Name: image.tex
+%% Purpose: wxImage documentation
+%% Author: wxWidgets Team
+%% Modified by:
+%% Created:
+%% RCS-ID: $Id$
+%% Copyright: (c) wxWidgets Team
+%% License: wxWindows license
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
\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 wxDC. Instead, a platform-specific
-wxBitmap object must be created from it, and that bitmap drawn on the wxDC, using
-wxDC::DrawBitmap.
+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{wxBitmap::wxBitmap(wxImage,int depth)}{wxbitmapctor} 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. 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 RGB data, not all images have an alpha channel and before using
+\helpref{GetAlpha}{wximagegetalpha} you should check if this image contains
+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}
+
+The following image handlers are available. {\bf wxBMPHandler} is always
+installed by default. To use other image formats, install the appropriate
+handler with \helpref{wxImage::AddHandler}{wximageaddhandler} or call
+\helpref{wxInitAllImageHandlers}{wxinitallimagehandlers}.
+
+\twocolwidtha{5cm}%
+\begin{twocollist}
+\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{wxTGAHandler}}{For loading only.}
+\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
+different colours in the image; if there are 256 or less colours, it will
+save as 8 bit, else it will save as 24 bit.
+
+Loading PNMs only works for ASCII or raw RGB images. When saving in
+PNM format, {\bf wxPNMHandler} will always save as raw RGB.
\wxheading{Derived from}
\wxheading{See also}
-\helpref{wxBitmap}{wxbitmap}
+\helpref{wxBitmap}{wxbitmap},
\helpref{wxInitAllImageHandlers}{wxinitallimagehandlers}
\latexignore{\rtfignore{\wxheading{Members}}}
-\membersection{wxImage::wxImage}\label{wximageconstr}
+
+\membersection{wxImage::wxImage}\label{wximagector}
\func{}{wxImage}{\void}
\func{}{wxImage}{\param{const wxImage\& }{image}}
-Copy constructor.
+Copy constructor, uses \helpref{reference counting}{trefcount}.
\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\_PNG}}
+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\_PNG}}
+\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.
+\func{}{wxImage}{\param{const char* const* }{xpmData}}
+
+Creates an image from XPM data.
+
\wxheading{Parameters}
\docparam{width}{Specifies the width of the image.}
\docparam{height}{Specifies the height of the image.}
-\docparam{name}{This refers to an image filename. Its meaning is determined by the {\it type} parameter.}
+\docparam{name}{Name of the file from which to load the image.}
-\docparam{stream}{This refers to an input stream. Its meaning is determined by the {\it type} parameter. It is equal to loading from file except that you provide opened stream (file, HTTP or any other custom class).}
+\docparam{stream}{Opened input stream from which to load the image. Currently, the stream must support seeking.}
\docparam{type}{May be one of the following:
\twocolwidtha{5cm}%
\begin{twocollist}
-\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_BMP}}}{Load a Windows bitmap file.}
-\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_PNG}}}{Load a PNG bitmap file.}
-\twocolitem{{\bf \indexit{wxBITMAP\_TYPE\_JPEG}}}{Load a JPEG bitmap file.}
-\end{twocollist}
-
-The validity of these flags depends on the platform and wxWindows configuration.
-If all possible wxWindows settings are used, the loading a BMP (Windows bitmap) file,
-a PNG (portable network graphics) file and a JPEG file is supported on all platforms that
-implement wxImage.}
+\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\_TGA}}{Load a TGA 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')}
-Note : you must call wxImage::AddHandler(new wxJPEGHandler) during application
-initialization in order to work with JPEGs.
+\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.}
+
+\docparam{xpmData}{A pointer to XPM image data.}
+
+\wxheading{Remarks}
+
+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}
\pythonnote{Constructors supported by wxPython are:\par
\indented{2cm}{\begin{twocollist}
-\twocolitem{\bf{wxImage(name, flag)}}{Loads an image from a file}
-\twocolitem{\bf{wxNullImage()}}{Create a null image (has no size or
+\twocolitem{{\bf wxImage(name, flag)}}{Loads an image from a file}
+\twocolitem{{\bf wxNullImage()}}{Create a null image (has no size or
image data)}
-\twocolitem{\bf{wxEmptyImage(width, height)}}{Creates an empty image
+\twocolitem{{\bf wxEmptyImage(width, height)}}{Creates an empty image
of the given size}
-\twocolitem{\bf{wxImageFromMime(name, mimetype}}{Creates an image from
+\twocolitem{{\bf wxImageFromMime(name, mimetype}}{Creates an image from
the given file of the given mimetype}
-\twocolitem{\bf{wxImageFromBitmap(bitmap)}}{Creates an image from a
+\twocolitem{{\bf wxImageFromBitmap(bitmap)}}{Creates an image from a
platform-dependent bitmap}
\end{twocollist}}
}
-\membersection{wxImage::\destruct{wxImage}}
+\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}}\label{wximagedtor}
\func{}{\destruct{wxImage}}{\void}
Destructor.
+See \helpref{reference-counted object destruction}{refcountdestruct} for more info.
+
\membersection{wxImage::AddHandler}\label{wximageaddhandler}
\helpref{wxImageHandler}{wximagehandler}
-\pythonnote{In wxPython this static method is named \tt{wxImage_AddHandler}.}
-\membersection{wxImage::CleanUpHandlers}
+\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::Blur}\label{wximageblur}
+
+\func{wxImage}{Blur}{\param{int}{ blurRadius}}
+
+Blurs the image in both horizontal and vertical directions by the specified pixel
+{\it blurRadius}. This should not be used when using a single mask colour
+for transparency.
+
+\wxheading{See also}
+
+\helpref{BlurHorizontal}{wximagehorzblur}
+\helpref{BlurVertical}{wximagevertblur}
+
+
+\membersection{wxImage::BlurHorizontal}\label{wximagehorzblur}
+
+\func{wxImage}{BlurHorizontal}{\param{int}{ blurRadius}}
+
+Blurs the image in the horizontal direction only. This should not be used
+when using a single mask colour for transparency.
+\wxheading{See also}
+
+\helpref{Blur}{wximageblur}
+\helpref{BlurVertical}{wximagevertblur}
+
+
+\membersection{wxImage::BlurVertical}\label{wximagevertblur}
+
+\func{wxImage}{BlurVertical}{\param{int}{ blurRadius}}
+
+Blurs the image in the vertical direction only. This should not be used
+when using a single mask colour for transparency.
+
+\wxheading{See also}
+
+\helpref{Blur}{wximageblur}
+\helpref{BlurHorizontal}{wximagehorzblur}
+
+
+\membersection{wxImage::CleanUpHandlers}\label{wximagecleanuphandlers}
\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::ConvertAlphaToMask}\label{wximageconvertalphatomask}
+
+\func{bool}{ConvertAlphaToMask}{\param{unsigned char}{ threshold = $128$}}
+
+If the image has alpha channel, this method converts it to mask. All pixels
+with alpha value less than \arg{threshold} are replaced with mask colour
+and the alpha channel is removed. Mask colour is chosen automatically using
+\helpref{FindFirstUnusedColour}{wximagefindfirstunusedcolour}.
+
+If the image image doesn't have alpha channel,
+ConvertAlphaToMask does nothing.
+
+\wxheading{Return value}
+
+\false if FindFirstUnusedColour returns \false, \true otherwise.
+
\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 (crude) colour reduction has to take place. When in 8-bit mode, this
-routine will use a color cube created on program start-up to look up colors.
-Still, the image quality won't be perfect for photo images.
+Deprecated, use equivalent \helpref{wxBitmap constructor}{wxbitmapctor}
+(which takes wxImage and depth as its arguments) instead.
+
+
+\membersection{wxImage::ConvertToGreyscale}\label{wximageconverttogreyscale}
+
+\constfunc{wxImage}{ConvertToGreyscale}{\param{double}{ lr = 0.299}, \param{double}{ lg = 0.587}, \param{double}{ lb = 0.114}}
+
+Returns a greyscale version of the image. The returned image uses the luminance
+component of the original to calculate the greyscale. Defaults to using
+ITU-T BT.601 when converting to YUV, where every pixel equals
+(R * {\it lr}) + (G * {\it lg}) + (B * {\it lb}).
+
+
+\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}
-\func{bool}{Destroy}{\void}
+\func{void}{Destroy}{\void}
Destroys the image data.
-\membersection{wxImage::FindHandler}
+
+\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}\label{wximagefindhandler}
\func{static wxImageHandler*}{FindHandler}{\param{const wxString\& }{name}}
\helpref{wxImageHandler}{wximagehandler}
+
+\membersection{wxImage::GetImageExtWildcard}\label{wximagegetimageextwildcard}
+
+\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", ::wxGetCwd(), "", _("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 blue intensity at the given coordinate.
+
\membersection{wxImage::GetData}\label{wximagegetdata}
\constfunc{unsigned char*}{GetData}{\void}
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 first pixel of
+the first row, the second one --- to the second pixel of the first row and so
+on until the end of the first row, with second row following after it 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}
-\constfunc{unsigned char}{GetRed}{\param{int}{ x}, \param{int}{ y}}
+\membersection{wxImage::GetImageCount}\label{wximagegetimagecount}
-Returns the red intensity at the given coordinate.
+\func{static int}{GetImageCount}{\param{const wxString\&}{ filename}, \param{long}{ type = wxBITMAP\_TYPE\_ANY}}
+
+\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}
+
+\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}
+
+Returns the palette associated with the image. Currently the palette is only
+used when converting to wxBitmap under Windows. Some of the wxImage handlers
+have been modified to set the palette if one exists in the image file (usually
+256 or less colour images in GIF or PNG format).
+
+
+\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}}
+\constfunc{wxImage}{GetSubImage}{\param{const wxRect\&}{ rect}}
-Returns a sub image of the current one as long as the rect belongs entirely to
+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{HSVValue::HSVValue}\label{hsvvaluehsvvalue}
+
+\func{}{HSVValue}{\param{double }{h = 0.0}, \param{double }{s = 0.0}, \param{double }{v = 0.0}}
+
+Constructor for HSVValue, an object that contains values for hue, saturation and value which
+represent the value of a color. It is used by \helpref{wxImage::HSVtoRGB}{wximagehsvtorgb}
+and \helpref{wxImage::RGBtoHSV}{wximagergbtohsv}, which
+converts between HSV color space and RGB color space.
+
+\pythonnote{use wxImage\_HSVValue in wxPython}
+
+
+
+\membersection{wxImage::HSVtoRGB}\label{wximagehsvtorgb}
+
+\func{wxImage::RGBValue}{HSVtoRGB}{\param{const HSVValue \& }{hsv}}
+
+Converts a color in HSV color space to RGB color space.
+
+
+\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}.
+
+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}
+
+
+\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::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}
+\membersection{wxImage::InitStandardHandlers}\label{wximageinitstandardhandlers}
\func{static void}{InitStandardHandlers}{\void}
Internal use only. Adds standard image format handlers. It only install BMP
-for the time being, which is use by wxBitmap.
+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}
-\helpref{wxImageHandler}{wximagehandler}
+\helpref{wxImageHandler}{wximagehandler},
\helpref{wxInitAllImageHandlers}{wxinitallimagehandlers}
-\membersection{wxImage::InsertHandler}
+
+\membersection{wxImage::InsertHandler}\label{wximageinserthandler}
\func{static void}{InsertHandler}{\param{wxImageHandler*}{ handler}}
\helpref{wxImageHandler}{wximagehandler}
+
+\membersection{wxImage::IsTransparent}\label{wximageistransparent}
+
+\constfunc{bool}{IsTransparent}{\param{int }{x}, \param{int }{y}, \param{unsigned char}{ threshold = $128$}}
+
+Returns \true if the given pixel is transparent, i.e. either has the mask
+colour if this image has a mask or if this image has alpha channel and alpha
+value of this pixel is strictly less than \arg{threshold}.
+
+
\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 use wxBITMAP\_TYPE\_BMP.
+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.
\wxheading{Parameters}
-\docparam{name}{A filename.
-The meaning of {\it name} is determined by the {\it type} parameter.}
+\docparam{name}{Name of the file from which to load the image.}
-\docparam{stream}{An input stream.
-The meaning of {\it stream} data is determined by the {\it type} parameter.}
+\docparam{stream}{Opened input stream from which to load the image. Currently, the stream must support seeking.}
\docparam{type}{One of the following values:
\twocolitem{{\bf wxBITMAP\_TYPE\_PCX}}{Load a PCX image file.}
\twocolitem{{\bf wxBITMAP\_TYPE\_PNG}}{Load a PNG image file.}
\twocolitem{{\bf wxBITMAP\_TYPE\_PNM}}{Load a PNM image file.}
-\end{twocollist}
-
-The validity of these flags depends on the platform and wxWindows configuration.}
+\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 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}
\pythonnote{In place of a single overloaded method name, wxPython
implements the following methods:\par
\indented{2cm}{\begin{twocollist}
-\twocolitem{\bf{LoadFile(filename, type)}}{Loads an image of the given
+\twocolitem{{\bf LoadFile(filename, type)}}{Loads an image of the given
type from a file}
-\twocolitem{\bf{LoadMimeFile(filename, mimetype)}}{Loads an image of the given
+\twocolitem{{\bf LoadMimeFile(filename, mimetype)}}{Loads an image of the given
mimetype from a file}
\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::IsOk}\label{wximageisok}
+
+\constfunc{bool}{IsOk}{\void}
+
+Returns true if image data is present.
+
+
+\membersection{RGBValue::RGBValue}\label{rgbvaluergbvalue}
-\membersection{wxImage::Ok}\label{wximageok}
+\func{}{RGBValue}{\param{unsigned char }{r = 0}, \param{unsigned char }{g = 0}, \param{unsigned char }{b = 0}}
-\constfunc{bool}{Ok}{\void}
+Constructor for RGBValue, an object that contains values for red, green and blue which
+represent the value of a color. It is used by \helpref{wxImage::HSVtoRGB}{wximagehsvtorgb}
+and \helpref{wxImage::RGBtoHSV}{wximagergbtohsv}, which
+converts between HSV color space and RGB color space.
-Returns TRUE if image data is present.
+\pythonnote{use wxImage\_RGBValue in wxPython}
-\membersection{wxImage::RemoveHandler}
+
+\membersection{wxImage::RGBtoHSV}\label{wximagergbtohsv}
+
+\func{wxImage::HSVValue}{RGBtoHSV}{\param{const RGBValue\& }{rgb}}
+
+Converts a color in RGB color space to HSV color space.
+
+
+\membersection{wxImage::RemoveHandler}\label{wximageremovehandler}
\func{static bool}{RemoveHandler}{\param{const wxString\& }{name}}
\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}, \param{int}{ quality = wxIMAGE\_QUALITY\_NORMAL}}
+
+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.
+
+For a description of the {\it quality} parameter, see the \helpref{Scale}{wximagescale} function.
+
+Returns the (modified) image itself.
+
+\wxheading{See also}
+
+\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},
+ \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::RotateHue}\label{wximagerotatehue}
+
+\func{void}{RotateHue}{\param{double}{ angle}}
+
+Rotates the hue of each pixel in the image by {\it angle}, which is a double in
+the range of -1.0 to +1.0, where -1.0 corresponds to -360 degrees and +1.0 corresponds
+to +360 degrees.
+
+
+\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}}
+
+Saves an image in the named file.
-\func{bool}{SaveFile}{\param{const wxString\& }{name}, \param{const wxString\&}{ mimetype}}
+\constfunc{bool}{SaveFile}{\param{const wxString\& }{name}}
-Saves a image in the named file.
+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{int}{ type}}
+\constfunc{bool}{SaveFile}{\param{wxOutputStream\& }{stream}, \param{int}{ type}}
-\func{bool}{SaveFile}{\param{wxOutputStream\& }{stream}, \param{const wxString\&}{ mimetype}}
+\constfunc{bool}{SaveFile}{\param{wxOutputStream\& }{stream}, \param{const wxString\&}{ mimetype}}
-Saves a image in the given stream.
+Saves an image in the given stream.
\wxheading{Parameters}
-\docparam{name}{A filename. The meaning of {\it name} is determined by the {\it type} parameter.}
+\docparam{name}{Name of the file to save the image to.}
-\docparam{stream}{An output stream. The meaning of {\it stream} is determined by the {\it type} parameter.}
+\docparam{stream}{Opened output stream to save the image to.}
-\docparam{type}{Currently two types can be used:
+\docparam{type}{Currently these types can be used:
\twocolwidtha{5cm}%
\begin{twocollist}
-\twocolitem{{\bf wxBITMAP\_TYPE\_PNG}}{Save a PNG image file.}
+\twocolitem{{\bf wxBITMAP\_TYPE\_BMP}}{Save a BMP image file.}
\twocolitem{{\bf wxBITMAP\_TYPE\_JPEG}}{Save a JPEG image file.}
-\end{twocollist}
-
-The validity of these flags depends on the platform and wxWindows configuration
-as well as user-added handlers.}
+\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\_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}
\pythonnote{In place of a single overloaded method name, wxPython
implements the following methods:\par
\indented{2cm}{\begin{twocollist}
-\twocolitem{\bf{SaveFile(filename, type)}}{Saves the image using the given
+\twocolitem{{\bf SaveFile(filename, type)}}{Saves the image using the given
type to the named file}
-\twocolitem{\bf{SaveMimeFile(filename, mimetype)}}{Saves the image using the given
+\twocolitem{{\bf SaveMimeFile(filename, mimetype)}}{Saves the image using the given
mimetype to the named file}
\end{twocollist}}
}
-\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.
-
-\wxheading{See also}
+\perlnote{Methods supported by wxPerl are:\par
+\begin{itemize}
+\item{bitmap->SaveFile( name, type )}
+\item{bitmap->SaveFile( name, mimetype )}
+\end{itemize}
+}
-\helpref{Scale}{wximagescale}
\membersection{wxImage::Scale}\label{wximagescale}
-\constfunc{wxImage}{Scale}{\param{int}{ width}, \param{int}{ height}}
+\constfunc{wxImage}{Scale}{\param{int}{ width}, \param{int}{ height}, \param{int}{ quality = wxIMAGE\_QUALITY\_NORMAL}}
Returns a scaled version of the image. This is also useful for
scaling bitmaps in general as the only other way to scale bitmaps
is to blit a wxMemoryDC into another wxMemoryDC.
-It may be mentioned that the GTK post uses this function internally
-to scale bitmaps when using mapping mode in wxDC.
+\docparam{quality}{Determines what method to use for resampling the image. Can be one of the following:
+
+\twocolwidtha{5cm}%
+\begin{twocollist}
+\twocolitem{{\bf wxIMAGE\_QUALITY\_NORMAL}}{Uses the normal default scaling method of pixel replication}
+\twocolitem{{\bf wxIMAGE\_QUALITY\_HIGH}}{Uses bicubic and box averaging resampling methods for upsampling and downsampling respectively}
+\end{twocollist}}
+
+It should be noted that although using wxIMAGE\_QUALITY\_HIGH produces much nicer
+looking results it is a slower method. Downsampling will use the box averaging method
+which seems to operate very fast. If you are upsampling larger images using
+this method you will most likely notice that it is a bit slower and in extreme cases
+it will be quite substantially slower as the bicubic algorithm has to process a lot of
+data.
+
+It should also be noted that the high quality scaling may not work as expected
+when using a single mask colour for transparency, as the scaling will blur the
+image and will therefore remove the mask partially. Using the alpha channel
+will work.
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::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}},\param{bool}{ static\_data = \false}}
+
+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 unless
+\arg{static\_data} parameter is set to \true -- in this case the caller should
+do 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::SetRGB}\label{wximagesetrgb}
-\func{void}{SetRGB}{\param{int }{x}, \param{int }{y}, \param{unsigned char }{red}, \param{unsigned char }{blue}, \param{unsigned char }{green}}
+\membersection{wxImage::SetMaskFromImage}\label{wximagesetmaskfromimage}
-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
-data, but in some cases this might be too slow so that the data will have to
-be set directly. In that case you have to get that data by calling GetData().
-
-\membersection{wxImage::operator $=$}
+\func{bool}{SetMaskFromImage}{\param{const wxImage\&}{ mask}, \param{unsigned char}{ mr}, \param{unsigned char}{ mg}, \param{unsigned char}{ mb}}
-\func{wxImage\& }{operator $=$}{\param{const wxImage\& }{image}}
+\wxheading{Parameters}
-Assignment operator. This operator does not copy any data, but instead
-passes a pointer to the data in {\it image} and increments a reference
-counter. It is a fast operation.
+\docparam{mask}{The mask image to extract mask shape from. Must have same dimensions as the image.}
-\wxheading{Parameters}
+\docparam{mr,mg,mb}{RGB value of pixels in {\it mask} that will be used to create the mask.}
-\docparam{image}{Image to assign.}
+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 'this' object.
+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.
-\membersection{wxImage::operator $==$}
+\wxheading{Notes}
-\func{bool}{operator $==$}{\param{const wxImage\& }{image}}
+Note that this method involves computing the histogram, which is
+computationally intensive operation.
-Equality operator. This operator tests whether the internal data pointers are
-equal (a fast test).
-\wxheading{Parameters}
+\membersection{wxImage::SetOption}\label{wximagesetoption}
-\docparam{image}{Image to compare with 'this'}
+\func{void}{SetOption}{\param{const wxString\&}{ name}, \param{const wxString\&}{ value}}
-\wxheading{Return value}
+\func{void}{SetOption}{\param{const wxString\&}{ name}, \param{int}{ value}}
-Returns TRUE if the images were effectively equal, FALSE otherwise.
+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}
-\membersection{wxImage::operator $!=$}
+\helpref{wxImage::GetOption}{wximagegetoption},\rtfsp
+\helpref{wxImage::GetOptionInt}{wximagegetoptionint},\rtfsp
+\helpref{wxImage::HasOption}{wximagehasoption}
-\func{bool}{operator $!=$}{\param{const wxImage\& }{image}}
-Inequality operator. This operator tests whether the internal data pointers are
-unequal (a fast test).
+\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}}
+
+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
+data, but in some cases this might be too slow so that the data will have to
+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}}
+
+Assignment operator, using \helpref{reference counting}{trefcount}.
\wxheading{Parameters}
-\docparam{image}{Image to compare with 'this'}
+\docparam{image}{Image to assign.}
\wxheading{Return value}
-Returns TRUE if the images were unequal, FALSE otherwise.
+Returns 'this' object.
+
+
\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{See also}
-\helpref{wxImage}{wximage}
+\helpref{wxImage}{wximage},
\helpref{wxInitAllImageHandlers}{wxinitallimagehandlers}
\latexignore{\rtfignore{\wxheading{Members}}}
-\membersection{wxImageHandler::wxImageHandler}\label{wximagehandlerconstr}
+
+\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}}
+
+\membersection{wxImageHandler::\destruct{wxImageHandler}}\label{wximagehandlerdtor}
\func{}{\destruct{wxImageHandler}}{\void}
Destroys the wxImageHandler object.
-\membersection{wxImageHandler::GetName}
-\constfunc{wxString}{GetName}{\void}
+\membersection{wxImageHandler::GetName}\label{wximagehandlergetname}
+
+\constfunc{const wxString\&}{GetName}{\void}
Gets the name of this handler.
-\membersection{wxImageHandler::GetExtension}
-\constfunc{wxString}{GetExtension}{\void}
+\membersection{wxImageHandler::GetExtension}\label{wximagehandlergetextension}
+
+\constfunc{const wxString\&}{GetExtension}{\void}
Gets the file extension associated with this handler.
-\membersection{wxImageHandler::GetType}
+
+\membersection{wxImageHandler::GetImageCount}\label{wximagehandlergetimagecount}
+
+\func{int}{GetImageCount}{\param{wxInputStream\&}{ stream}}
+
+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{stream}{Opened input stream for reading image data. Currently, the stream must support seeking.}
+
+\wxheading{Return value}
+
+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}
-\constfunc{wxString}{GetMimeType}{\void}
+\membersection{wxImageHandler::GetMimeType}\label{wximagehandlergetmimetype}
+
+\constfunc{const 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}}
+\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}.
+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}
+indicates which image to read from the stream.
\wxheading{Parameters}
\docparam{image}{The image object which is to be affected by this operation.}
-\docparam{stream}{Opened input stream.
-The meaning of {\it stream} is determined by the {\it type} parameter.}
+\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{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}
-\helpref{wxImage::LoadFile}{wximageloadfile}\\
-\helpref{wxImage::SaveFile}{wximagesavefile}\\
+\helpref{wxImage::LoadFile}{wximageloadfile},
+\helpref{wxImage::SaveFile}{wximagesavefile},
\helpref{wxImageHandler::SaveFile}{wximagehandlersavefile}
+
\membersection{wxImageHandler::SaveFile}\label{wximagehandlersavefile}
\func{bool}{SaveFile}{\param{wxImage* }{image}, \param{wxOutputStream\& }{stream}}
\docparam{image}{The image object which is to be affected by this operation.}
-\docparam{stream}{A stream. The meaning of {\it stream} is determined by the {\it type} parameter.}
+\docparam{stream}{Opened output stream for writing the data.}
\wxheading{Return value}
-TRUE if the operation succeeded, FALSE otherwise.
+true if the operation succeeded, false otherwise.
\wxheading{See also}
-\helpref{wxImage::LoadFile}{wximageloadfile}\\
-\helpref{wxImage::SaveFile}{wximagesavefile}\\
+\helpref{wxImage::LoadFile}{wximageloadfile},
+\helpref{wxImage::SaveFile}{wximagesavefile},
\helpref{wxImageHandler::LoadFile}{wximagehandlerloadfile}
-\membersection{wxImageHandler::SetName}
+
+\membersection{wxImageHandler::SetName}\label{wximagehandlersetname}
\func{void}{SetName}{\param{const wxString\& }{name}}
\docparam{name}{Handler name.}
-\membersection{wxImageHandler::SetExtension}
+
+\membersection{wxImageHandler::SetExtension}\label{wximagehandlersetextension}
\func{void}{SetExtension}{\param{const wxString\& }{extension}}
\docparam{extension}{Handler extension.}
-\membersection{wxImageHandler::SetType}
-\func{void}{SetType}{\param{long }{type}}
+\membersection{wxImageHandler::SetMimeType}\label{wximagehandlersetmimetype}
-Sets the handler type.
+\func{void}{SetMimeType}{\param{const wxString\& }{mimetype}}
+
+Sets the handler MIME type.
\wxheading{Parameters}
-\docparam{name}{Handler type.}
+\docparam{mimename}{Handler MIME type.}
-\membersection{wxImageHandler::SetMimeType}
+\membersection{wxImageHandler::SetType}\label{wximagehandlersettype}
-\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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