wxBitmap object must be created from it, and that bitmap drawn on the wxDC, using
wxDC::DrawBitmap.
-This class is currently only available under GTK and Windows.
-
\wxheading{Derived from}
\helpref{wxObject}{wxobject}
Creates an image with the given width and height.
-\func{}{wxImage}{\param{const wxString\& }{name}, \param{long}{ type = wxIMAGE\_TYPE\_PNG}}
+\func{}{wxImage}{\param{const wxString\& }{name}, \param{long}{ type = wxBITMAP\_TYPE\_PNG}}
Loads an image from a file.
-\func{}{wxImage}{\param{wxInputStream\& }{stream}, \param{long}{ type = wxIMAGE\_TYPE\_PNG}}
+\func{}{wxImage}{\param{wxInputStream\& }{stream}, \param{long}{ type = wxBITMAP\_TYPE\_PNG}}
Loads an image from an input stream.
\docparam{type}{May be one of the following:
-\twocolwidtha{5cm}
+\twocolwidtha{5cm}%
\begin{twocollist}
-\twocolitem{{\bf \indexit{wxIMAGE\_TYPE\_BMP}}}{Load a Windows bitmap file.}
-\twocolitem{{\bf \indexit{wxIMAGE\_TYPE\_PNG}}}{Load a PNG bitmap file.}
+\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
-and a PNG (portable network graphics) file is supported on all platforms that
+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.}
+Note : you must call wxImage::AddHandler(new wxJPEGHandler) during application
+initialization in order to work with JPEGs.
+
\wxheading{See also}
\helpref{wxImage::LoadFile}{wximageloadfile}
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. Especially when converting
-to 8-bit (or even less) bitmaps, the routine is slow and will reduce the
-quality of the resulting bitmap. A proper set of colour reduction methods has
-not yet been written.
+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.
\membersection{wxImage::Create}\label{wximagecreate}
\docparam{extension}{The file extension, such as ``bmp".}
-\docparam{imageType}{The image type, such as wxIMAGE\_TYPE\_BMP.}
+\docparam{imageType}{The image type, such as wxBITMAP\_TYPE\_BMP.}
\wxheading{Return value}
\func{static void}{InitStandardHandlers}{\void}
Adds the standard image format handlers, which, depending on wxWindows
-configuration, can be handlers for Windows BMP (loading) and PNG
-(loading and saving) file formats.
+configuration, can be handlers for Windows BMP (loading), PNG
+(loading and saving) and JPEG (loading and saving) file formats.
This function is called by wxWindows on startup.
\docparam{type}{One of the following values:
-\twocolwidtha{5cm}
+\twocolwidtha{5cm}%
\begin{twocollist}
-\twocolitem{{\bf wxIMAGE\_TYPE\_BMP}}{Load a Windows image file.}
-\twocolitem{{\bf wxIMAGE\_TYPE\_PNG}}{Load a PNG image file.}
+\twocolitem{{\bf wxBITMAP\_TYPE\_BMP}}{Load a Windows image file.}
+\twocolitem{{\bf wxBITMAP\_TYPE\_PNG}}{Load a PNG image file.}
+\twocolitem{{\bf wxBITMAP\_TYPE\_JPEG}}{Load a JPEG image file.}
\end{twocollist}
The validity of these flags depends on the platform and wxWindows configuration.}
\docparam{stream}{An output stream. The meaning of {\it stream} is determined by the {\it type} parameter.}
-\docparam{type}{Currently only one type can be used:
+\docparam{type}{Currently two types can be used:
-\twocolwidtha{5cm}
+\twocolwidtha{5cm}%
\begin{twocollist}
-\twocolitem{{\bf wxIMAGE\_TYPE\_PNG}}{Save a PNG image file.}
+\twocolitem{{\bf wxBITMAP\_TYPE\_PNG}}{Save a PNG 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
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 do blit a wxMemoryDC into another wxMemoryDC. Windows can such scaling
-itself, but on GTK scaling bitmaps is done using this routine
-internally.
+is to blit a wxMemoryDC into another wxMemoryDC. Windows can do such
+scaling itself but in the GTK port, scaling bitmaps is done using
+this routine internally.
\membersection{wxImage::SetData}\label{wximagesetdata}
\func{void}{SetMaskColour}{\param{unsigned char }{red}, \param{unsigned char }{blue}, \param{unsigned char }{green}}
-Sets the mask colour for this image.
+Sets the mask colour for this image (and tells the image to use the mask).
\membersection{wxImage::SetRGB}\label{wximagesetrgb}
and add the handler using \helpref{wxImage::AddHandler}{wximageaddhandler} in your
application initialisation.
+\wxheading{Note (Legal Issue)}
+
+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
+created by IJG.)
+
\wxheading{Derived from}
\helpref{wxObject}{wxobject}
\docparam{name}{Handler type.}
-
projects / wxWidgets.git / blobdiff