\wxheading{Alpha channel support}
-Starting from wxWindows 2.5.0 wxImage supports alpha channel data, that is in
+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 $255$
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
-neither).
+either).
\wxheading{Available image handlers}
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.
+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.
\func{}{wxImage}{\param{int}{ width}, \param{int}{ height}, \param{unsigned char*}{ data}, \param{bool}{ static\_data=false}}
\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
\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( name, type )}
-\item{Wx::Image->new( name, mimetype )}
+\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}
}
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}
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}
\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}
\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 image data as an array. This is most often used when doing
direct image manipulation. The return value points to an array of
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.
+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}.
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}
\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:
\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}
\constfunc{bool}{SaveFile}{\param{const wxString\& }{name}, \param{int}{ type}}
\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
\end{itemize}
}
-\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::Scale}\label{wximagescale}
\constfunc{wxImage}{Scale}{\param{int}{ width}, \param{int}{ height}}
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}
projects / wxWidgets.git / blobdiff