\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 $255$
\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
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}
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