Ref counting overview.

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

diff --git a/docs/latex/wx/palette.tex b/docs/latex/wx/palette.tex
index 7f8c2cc6f0e222056ff2fb286dc2acf1d1db9aa2..3524bf599ffd0e4539bdbcd89d4e1fe3456cbe7d 100644 (file)
--- a/docs/latex/wx/palette.tex
+++ b/docs/latex/wx/palette.tex
@@ -1,7 +1,28 @@
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Name:        palette.tex
+%% Purpose:     wxPalette docs
+%% Author:
+%% Modified by:
+%% Created:
+%% RCS-ID:      $Id$
+%% Copyright:   (c) wxWidgets
+%% License:     wxWindows license
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
 \section{\class{wxPalette}}\label{wxpalette}
 
-A palette is a table that maps pixel values to RGB colours. It allows the colours
-of a low-depth bitmap, for example, to be mapped to the available colours in a display.
+A palette is a table that maps pixel values to RGB colours. It allows the
+colours of a low-depth bitmap, for example, to be mapped to the available
+colours in a display. The notion of palettes is becoming more and more
+obsolete nowadays and only the MSW port is still using a native palette.
+All other ports use generic code which is basically just an array of
+colours. 
+
+It is likely that in the future the only use for palettes within wxWidgets
+will be for representing colour indeces from images (such as GIF or PNG).
+The image handlers for these formats have been modified to create a palette
+if there is such information in the original image file (usually 256 or less
+colour images). See \helpref{wxImage}{wximage} for more information.
 
 %TODO: topic overview for wxPalette.
 \wxheading{Derived from}
@@ -25,7 +46,7 @@ Objects:
 
 \latexignore{\rtfignore{\wxheading{Members}}}
 
-\membersection{wxPalette::wxPalette}\label{wxpaletteconstr}
+\membersection{wxPalette::wxPalette}\label{wxpalettector}
 
 \func{}{wxPalette}{\void}
 
@@ -33,7 +54,7 @@ Default constructor.
 
 \func{}{wxPalette}{\param{const wxPalette\&}{ palette}}
 
-Copy constructor. This uses reference counting so is a cheap operation.
+Copy constructor, uses \helpref{reference counting}{trefcount}.
 
 \func{}{wxPalette}{\param{int}{ n}, \param{const unsigned char* }{red},\\
  \param{const unsigned char* }{green}, \param{const unsigned char* }{blue}}
@@ -60,7 +81,7 @@ red, blue or green component.
 \perlnote{In wxPerl the third constructor form takes as parameters
   3 array references ( they must be of the same length ).}
 
-\membersection{wxPalette::\destruct{wxPalette}}
+\membersection{wxPalette::\destruct{wxPalette}}\label{wxpalettedtor}
 
 \func{}{\destruct{wxPalette}}{\void}
 
@@ -86,16 +107,22 @@ red, blue or green component.
 
 \wxheading{Return value}
 
-TRUE if the creation was successful, FALSE otherwise.
+true if the creation was successful, false otherwise.
 
 \wxheading{See also}
 
-\helpref{wxPalette::wxPalette}{wxpaletteconstr}
+\helpref{wxPalette::wxPalette}{wxpalettector}
+
+\membersection{wxPalette::GetColoursCount}\label{wxpalettegetcolourscount}
+
+\constfunc{int}{GetColoursCount}{\void}
+
+Returns number of entries in palette.
 
 \membersection{wxPalette::GetPixel}\label{wxpalettegetpixel}
 
-\constfunc{int}{GetPixel}{\param{const unsigned char }{red}, \param{const unsigned char }{green},\rtfsp
- \param{const unsigned char }{blue}}
+\constfunc{int}{GetPixel}{\param{unsigned char }{red}, \param{unsigned char }{green},\rtfsp
+ \param{unsigned char }{blue}}
 
 Returns a pixel value (index into the palette) for the given RGB values.
 
@@ -109,7 +136,7 @@ Returns a pixel value (index into the palette) for the given RGB values.
 
 \wxheading{Return value}
 
-The nearest palette index.
+The nearest palette index or {\tt wxNOT\_FOUND} for unexpected errors.
 
 \wxheading{See also}
 
@@ -117,7 +144,7 @@ The nearest palette index.
 
 \membersection{wxPalette::GetRGB}\label{wxpalettegetrgb}
 
-\constfunc{bool}{GetPixel}{\param{int}{ pixel}, \param{const unsigned char* }{red}, \param{const unsigned char* }{green},\rtfsp
+\constfunc{bool}{GetRGB}{\param{int}{ pixel}, \param{const unsigned char* }{red}, \param{const unsigned char* }{green},\rtfsp
  \param{const unsigned char* }{blue}}
 
 Returns RGB values for a given palette index.
@@ -134,7 +161,7 @@ Returns RGB values for a given palette index.
 
 \wxheading{Return value}
 
-TRUE if the operation was successful.
+true if the operation was successful.
 
 \wxheading{See also}
 
@@ -143,18 +170,17 @@ TRUE if the operation was successful.
 \perlnote{In wxPerl this method takes only the {\tt pixel} parameter and
   returns a 3-element list ( or the empty list upon failure ).}
 
-\membersection{wxPalette::Ok}\label{wxpaletteok}
+\membersection{wxPalette::IsOk}\label{wxpaletteisok}
 
-\constfunc{bool}{Ok}{\void}
+\constfunc{bool}{IsOk}{\void}
 
-Returns TRUE if palette data is present.
+Returns true if palette data is present.
 
 \membersection{wxPalette::operator $=$}\label{wxpaletteassignment}
 
 \func{wxPalette\&}{operator $=$}{\param{const wxPalette\& }{palette}}
 
-Assignment operator, using reference counting. Returns a reference
-to `this'.
+Assignment operator, using \helpref{reference counting}{trefcount}.
 
 \membersection{wxPalette::operator $==$}\label{wxpaletteequals}
 
@@ -172,4 +198,3 @@ fail the test.
 Inequality operator. Two palettes are not equal if they contain pointers
 to different underlying palette data. It does not compare each attribute.
 
-