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Skinning

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Revision as of 17:27, 17 September 2007 by Jmarshall (Talk)

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XBMC is noted as having a very flexible and robust framework for its GUI, making theme-skinning and personal customization very accessible. Users can create their own skin (or modify an existing skin) and share it with others via public websites dedicated for Xbox skins trading. "Project Mayhem" is the official skin; which is now in its third version, commonly know as "PMIII".

Contents

1 General Information

XBMC includes a new GUI library written from scratch. This library allows you to skin/change everything you see in XBMC, from the images, the sizes and positions of all controls, colours, fonts, and text, through to altering navigation and even adding new functionality. The skin system is quite complex, and this portion of the manual is dedicated to providing in depth information on how it all works, along with tips to make the experience a little more pleasant.

A skin called “Project Mayhem III”, which can be found in the XBMC SVN, is included with XBMC; the skin was originally created by Chokemaniac and is kept up-to-date by Team XBMC. Any additional skins you create, or download from places such as www.xboxskins.net must be placed in the XBMC/Skin sub-folder if you wish to have XBMC auto-detect the skin and allow you to load it from within the Appearance Settings. Currently, XBMC supports skin versions 2.0.0 and above; you will not be able to select and use a skin that is older than version 2.0

You may wish to start by having a look through the tutorial section, and try modifying a window or two by adding a button, or altering the textures or layout.

2 Skin Compatibility List

You can find a full list of supported skins for Xbox Media Center 2.0.0 and above in the Skin Compatibility List section.

3 Anatomy of a Skin

The “Project Mayhem III” skin is a great starting point for designing your own skin; it contains many of the latest SVN features found in XBMC. If you want to make your own skin, start by copying the contents of the existing “Project Mayhem III” skin sub-folder into a new folder - for example, XBMC/Skin/MySkin. You can then edit each of the various skin files as you become more familiar with the skinning system.

Each skin folder must contain a skin.xml and this initial set of sub-folders:

MySkin/skin.xml
This contains the information that XBMC uses to find the other files that XBMC requires to describe it's skin. It also contains credits information, and versioning information.
MySkin/font
This sub-folder contains all fonts used by the skin. you can add/replace fonts here
MySkin/media
This sub-folder contains all the media files (.png/.gif/.jpg...)
MySkin/sounds
This sub-folder contains all the audio files (sounds.xml/.wav...)
MySkin/colors
This sub-folder contains xml files describing the colors (text/diffuse) used in the skin, to allow different color themes.
MySkin/PAL
This is a resolution-specific folder.

Most skins also include the following set of sub-folders:

MySkin/PAL16x9
This is a resolution-specific folder.
MySkin/NTSC
This is a resolution-specific folder.
MySkin/NTSC16x9
This is a resolution-specific folder.
MySkin/720p
This is a resolution-specific folder.
MySkin/1080i
This is a resolution-specific folder.

XBMC can run in multiple resolutions, and thus can use different files for some resolutions (as there is a big difference between NTSC at 720x480 pixels and 1080i at 1920x1080 pixels!) You can review the order by which XBMC retrieves resolution information in the How Window XML Files Are Found section.

More advanced skins may also contain sub-folders for additional components required to make their skin work; for example:

MySkin/extras
Often used to store special skin components or functions (scripts, etc.)
MySkin/docs
Often used to store documentation (readme, changelog, etc.)

The goal is to keep your skin folder structure as cleanly organized as possible as it makes it easier to troubleshoot problems; this is becomes very important if you are working as part of a XBMC skin creation team.

4 Skin Themes

All the basic media files for a skin should be compressed into the Textures.xpr file, and placed in the media/ folder. You can use the tool XBMCTex for this. All the images that make up the default skin theme should be in the Textures.xpr file.

In addition to this, XBMC allows other .xpr files in the media/ folder, each one representing a different theme for your skin. For instance, you could tint all your main textures a red colour, and create a new theme package Red.xpr? – this gives users more choice in the look of a particular skin. Note that only the textures change when you change themes – the layout stays the same. If the user has selected a theme, then when a control requires a texture, XBMC will first look in the <themename>.xpr file for the texture. It will fall back to the Textures.xpr file if <themename>.xpr doesn't contain the image. This means that the theme .xpr files need only contain the changed textures – all other textures will fallback to using Textures.xpr as usual.

When the user selects a theme, XBMC will automatically also select the themes default color set, based on the <themename>.xml file located in the colors/ folder. See below for more information.

A suggested method of creating a theme is as follows:

  1. Run XBMCTex.exe on the folder containing the default texture files, to generate Textures.xpr as you would normally do.
  2. Identify the textures you wish to have themed and copy them to a separate folder.
  3. Create a separate folder for each theme outside of your normal skin work area, and place the altered copies of each of the textures in them.
  4. Run XBMCTex.exe on each of the theme folders created in step 3 to create the themed .xpr files (note you can use the -output switch with XBMCTex.exe to name the theme appropriately).
  5. Place Textures.xpr and each of the theme .xpr files in the media/ folder of your skin. XBMC will automatically pick them up.



5 Colour Themes

Different colour themes can be accomplished by placing a set of .xml files in the colors/ folder of the skin. See here for more information.

6 Fonts

XBMC allows you to customize which fonts are displayed onscreen in the User Interface. See the Fonts section for more information.

7 Includes

The other special (and arguably the most important skinning file of all) is includes.xml. This is, as its title suggests, a place from which you can define the default look, size, and positioning of controls, to save you replicating many of the control's attributes throughout the window .xml files. For instance, you can setup the size, and textures used for a button control, thus allowing you to leave those details out in the rest of the skin files, unless ofcourse you want to override the default look or size etc. in a particular window.

This is extremely valuable as it allows you to greatly simplify a lot of the work in building a skin. For one thing, it means that once you have include files setup, many of the default parameters for a different resolution can be done by just altering the parameters within the include file(s) for the different resolution.

With the 2.1 skinning engine, you can infact have more than one include file - you can specify the file attribute when including from a different file, allowing you to have an include file dedicated to a particular set of attributes.

The layout of an includes file is as follows. <xml>

 <includes>
   <include name="whitetext">
     <textcolor>ffffffff</textcolor>
   </include>
   <include file="listdefaults.xml" />
   <default type="button">
     <include>whitetext</include>
   </default>
   <constant name="leftedge">50</constant>
 </includes>

</xml>

You'll notice in the above example that we have 4 different types of includes. The first <include> tag basically allows a substitution of the tags underneath it whenever it occurs. For instance, if in a window .xml file you have this:

<xml>

 <control type="togglebutton">
   <include>whitetext</include>
   ... other tags go here
 </control>

</xml>

Then it would substitute the <textcolor> tag for where the include tag is. You can have as many includes as you like, and as many tags can be inside an include - even complete controls, or complete control groups.

The second <include> tag in the example demonstrates how to include from a different file. As there is no include name specifies, it will include the contents of the entire file at that point.

The <default> tag is similar to an include, except that it is used in every control of that type - even if you don't specify that the control is to use includes. Thus every buttoncontrol will have the whitetext include in it. Note that you can override this by specifying the <textcolor> tag in the buttoncontrol.

And finally, the <constant> tag allows you to define a numeric (floating point) constant by name for use in place of numeric values (<posx>, height="" etc.) would otherwise be used. This allows alignment of items using the same position values which can then easily be altered in one place.

8 The Window XML Files

The other xml files each define the skin for a single window. They all have the same basic layout, allowing you to place different controls on the window, and define how navigation should operate.

The list of all window .xml files and what they represent is be found in the Window ID's section.

The important thing to remember is that each window has a unique identifying number (id). This is how XBMC identifies the window from within the source code. Furthermore, many of the controls within each window should have a unique id as well, unless they're just used as images or labels where navigation is unimportant and XBMC does not need to be able to identify them uniquely. The window id's are all listed in the window list.

The structure of the window .xml files can be found in the Window Structure section.

9 Controls

Controls are the substance of your skin. They define everything from buttons, to text labels, to visualization placement. The Controls section will explain each and every control in detail.

10 Conditional Visibility

XBMC's skinning engine versatility is based apon the fact that the skinner can display and hide portions of the skin using a variety of conditional statements that can be combined to create very user friendly UI implementations. For further information of available variable and how they can be applied see the Conditional Visibility section.

11 Animating Your Skin

The XBMC skinning engine supports animations of any control allowing them to rotate, slide, fade or any combination there-of. Combining animations with conditional statements ensure your skin will have stunning effects that appear as professional as a 1st party product. For further information, see the Animating Your Skin section.

12 Skinning Tutorials

This Skinning Tutorials section is designed to help both people who are new to skinning XBMC get to grips with how the system works, as well as dealing with a few things that the old timers may find useful.

13 Skinning Tools

The following tools are designed primarily for skinners who want to create and test out their skins (and python scripts) without having to transfer everything to the xbox.

TOOL
NOTES
XBMC PC
- Requires Visual Studio 2003 (.NET)
- Requires DirectX SDK (Summer 2004 recommended) to build executable.
- Requires DirectX8 compatible graphics card on system.

Source code is available in SVN. Just ask on the skinning forums or in #xbmc on freenode if you can't build it yourself, and someone will help you out.
XBMC for Linux
- Requires Ubuntu Feisty Fawn (7.04) and packages required for development.

- Cannot currently compress textures though (XBMCTex is not yet ported).
XBMC Skin Editor
- Self-contained Installer (.MSI).

http://xbmcskineditor.xbox-scene.com



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