Improve doxygen documentation

tools/doxygen/BoardTheming.md

@@ -1,4 +1,21 @@
 Board Theming
 ======
 
-TBA
+In OChess, every board skins (squares and pieces) are made of *200x200* pixels tiles stored in <i>.png</i> images. OChess is in charge of breaking these tiles apart into individual elements.
+
+### Squares
+Squares skins are <i>.png</i> images, with a dimension of *400x200* pixels (2 tiles next to each other). The tile starting at pixel (0,0) are for dark squares and the other one for light squares.
+
+### Pieces
+
+Pieces skins are <i>.png</i> images, with a dimension of *400x1200* pixels (2 columns of 6 tiles). The first column, starting at pixel (0,0) are for black pieces and the other column for the white pieces. From top, to bottom pieces are in the following order: King, Queen, Rook, Bishop, Knight, Pawn.
+
+### Create a Skin with generate.sh
+
+To create a pieces skin named *myskin*, create the folder `tools/skin/pieces/myskin`. In this folder, place all the pieces in the <i>.svg</i> format with the following name convention: `bb.svg` for <b>b</b>lack <b>b</b>ishop, `wk.svg` for <b>w</b>hite <b>k</b>ing, `wn.svg` for <b>w</b>hite <b>k</b>night, `bn.svg` for <b>b</b>lack <b>k</b>night,...
+
+Then, run the `tools/skin/generate.sh` script. This script will combine the <i>.svg</i> file into a single <i>.png</i> file located in `tools/assets/pieces/myskin.png`.
+
+Use the same approach to create boards skins.
+
+**Note:** The `tools/skin/generate.sh` script is meant to be used on Linux Distributions and requires [Bash](https://www.gnu.org/software/bash/), [ImageMagick](https://imagemagick.org/) and [Inkscape](https://inkscape.org/).

tools/doxygen/Doxyfile

@@ -505,7 +505,7 @@ EXTRACT_ALL            = NO
 # be included in the documentation.
 # The default value is: NO.
 
-EXTRACT_PRIVATE        = NO
+EXTRACT_PRIVATE        = YES
 
 # If the EXTRACT_PRIV_VIRTUAL tag is set to YES, documented private virtual
 # methods of a class will be included in the documentation.
@@ -917,7 +917,7 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = ../../src MainPage.md Opening.md BoardTheming.md
+INPUT                  = ../../src MainPage.md Opening.md BoardTheming.md Libraries.md
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses

tools/doxygen/Libraries.md

@@ -0,0 +1,24 @@
+Internal Libraries
+====
+
+Ochess uses 5 internal libraries (excluding [wxWidgets](https://www.wxwidgets.org/)):
+- [cgeditor](https://gitlab.com/manzerbredes/cgeditor): A 2D chess game moves presenter/editor
+- [pgnp](https://gitlab.com/manzerbredes/pgnp): An efficient PGN parser
+- [chessarbiter](https://gitlab.com/manzerbredes/chessarbiter): A chess classical chess game arbiter for C++
+- [uciadapter](https://gitlab.com/manzerbredes/uciadapter): A cross platform utility to interact with UCI chess engines
+- [chess-move-interface](https://gitlab.com/manzerbredes/chess-move-interface): A chess half move interface for libraries interoperability
+
+### CGEditor
+It is only used in EditorCanvas.
+
+### PGNP
+It is only used in PGNGameBase.
+
+### ChessArbiter
+Mostly used in Game and HalfMove.
+
+### UCIAdapter
+Used in various engine related areas such as MainWindow, EngineTab and LiveEngineDialog.
+
+### Chess-Move-Interface
+Used in various region of OChess such as PGNGameBase and HalfMove.

tools/doxygen/Opening.md

@@ -1,7 +1,7 @@
 %Opening Names DB
 =====
 
-The chess opening names database uses the [Lichess chess-openings](https://github.com/lichess-org/chess-openings) project. The script `tools/openings.sh` is used to fetch the last updates from the project, and generate the `binres/openings.hpp` file.
+The chess opening names database uses the [Lichess chess-openings](https://github.com/lichess-org/chess-openings) project. The script `tools/openings.sh` is used to fetch the last updates from the project, and generate the `binres/openings.hpp` file. In turn, this file is used in Openings.hpp.
 
 
 #### Acknowledgements