changed exceptions handling to work under wxGTK

[wxWidgets.git] / docs / latex / wx / image.tex

diff --git a/docs/latex/wx/image.tex b/docs/latex/wx/image.tex
index 379ce7fb72b14c980ea7de68b67faa4e5d22e4b6..9cf68bb2a00dd5a8af521cf4d360417e643410a8 100644 (file)
--- a/docs/latex/wx/image.tex
+++ b/docs/latex/wx/image.tex
@@ -98,7 +98,7 @@ and forth without loss in that respect.
 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}}
+\func{}{wxImage}{\param{int}{ width}, \param{int}{ height}, \param{unsigned char*}{ data}, \param{bool}{ static\_data = \false}}
 
 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
@@ -270,7 +270,7 @@ Returns number of colours in the histogram.
 
 \membersection{wxImage::ConvertAlphaToMask}\label{wximageconvertalphatomask}
 
-\func{bool}{ConvertAlphaToMask}{\param{unsigned char}{ threshold = 128}}
+\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
@@ -708,6 +708,15 @@ of a given handler class in an application session.}
 \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}, \param{int}{ index = -1}}
@@ -1023,14 +1032,16 @@ suitable mask colour for any newly exposed areas.
 
 \membersection{wxImage::SetAlpha}\label{wximagesetalpha}
 
-\func{void}{SetAlpha}{\param{unsigned char *}{alpha = {\tt NULL}}}
+\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.
+{\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}}