OpenTTD | Portable device version

OpenTTD is currently available for a number of portable devices with small screens. Unfortunately most of those ports were forked from the SVN trunk. Thus they are hard to maintain and specific code, e.g. for small screens, is not being shared among those versions. The goal should be to merge the best of those versions into trunk in order to make them more similar and easier to update.

To accomplish this I'll start with listing all the ports in questions and I hope that some of the maintainers of the ports will contribute to this task.

System	Resolution	Input	Memory	CPU	Special information	Latest version	Link
Android	Dynamic	Touchscreen Directional pad (If exists) Analog stick (If exists) Screen / connected keyboard	N/a	N/a	Works like normal version of the game.	1.9.1	Google Play GitHub
Kindle Fire	Dynamic	Touchscreen Directional pad (If exists) Analog stick (If exists) Screen / connected keyboard	N/a	N/a		1.2.2	Amazon
GP2X	320 x 240	Touchscreen Eight buttons Directional pad 2-way volume button	64 MB	200 MHz		0.5.3	gp2x wiki
iPhone / iPod Touch	480 x 320 (640 x 340)	Touchscreen (needs stylus, barely useable with fingers)	128 MB	620 MHz	Banned from the iTunes App Store due to the GPL license.	Mutilated "1.0.0"	zodTTD
Maemo (Nokia n800,n810 etc)	800 x 480	Touchscreen Directional pad 2-way volume button Home, back, fullscreen and menu buttons	128 MB	400 MHz		r12346	tt-forums
Nintendo DS	256 x 384	Touchscreen on lower screen Eight buttons Analog directional pad	4 MB	66 MHz		0.6.0-alpha6	Wiki page
Palm OS	320 x 320	4/5-way directional pad 4 buttons	min. 4 MB dynamic heap	400 MHz	The port emulates a virtual 640x480 screen	0.4.7?	eSoft Interactive website
Palm Pre	480 x 320	Palm Query Keyboard Touchscreen Gesture area	256 MB	600 MHz		trunk	tt-forums
Playstation Portable	480 x 272	Eight buttons Digital directional pad Analog 'nub'	32 MB (PSP Fat), 64 MB (PSP Slim & Lite)	222-333 MHz		0.5.3	homepage
Pocket PC	320 x 240 640 x 480	Touch screen 5 Way directional pad	15 MB	200 MHz		0.6.0-beta2	eSoft Interactive website
Symbian S60v3	240 x 320	Joystick/directional pad (4 or 8 directions) 3 soft keys (fixed position) 12 main keys (fixed position) "C" and "pen" keys (variable position) 2 volume keys (on the side)	< 20MB	220 MHz		0.6.0-beta5	tt-forums
UIQ3	240 x 320						mySymbian forums
Zaurus SL-C760 PDA	640 x 480					0.3.2.1	Zaurus Software Index

Note: Only the minimum system specifications are listed if there are several devices with e.g. different resolutions.

Summary

The minimum system specifications where the portable device version should be running on are the following:

Width: 240 pixels
- equals a 16 pixel high toolbar with 15 icons
Height: 240 pixels
- with 16 pixels for the toolbar and 12 pixels for the status bar this only leaves a 212 pixel high screen area.
Memory: 4 MB
- on some systems (e.g. NDS) the game binary goes into RAM as well which only leaves a bit more than 2 MB of RAM
- for comparison: a 512x512 map alone is 2.25 MB big
CPU: 66 MHz
Input: touchscreen only

Features required for portable devices

Feature	Assigned to	Status	Remarks
Smaller and more flexible toolbar	Dominik (Nintendo DS port)	Finished	r12398 separated the toolbar code, paving the road to more toolbar patches. A patch for splitting the toolbar NDS style (here) has been included. When playing OpenTTD at less than 440 px horizontal resolution (assuming standard size icons), the toolbar will be split, with a button to switch between the two widget lists. Screenshot: 16px-toolbar on the lower screen of a Nintendo DS
Touch-scrolling	Illogict (Maemo port)	In progress	already included in the Maemo port tt-forums
Better scalable windows / small gui versions		Unclaimed	some windows have already been resized in the DS port (upcoming Alpha 6)
On screen keyboard	Dominik (Nintendo DS port)	Finished	In trunk since r12425 The OSK has 50 character keys, one backspace key, one shift key, one caps lock key, a space bar, two arrow buttons and a special key which can be mapped to device-specific functions. The keyboard layout is determined by the selected language; additionally users can specify custom key layouts in the config file A total of 100 different characters per language can be entered with the Osk
Text recognition		Unclaimed
Draw railroads		Unclaimed
Better responsiveness	Partly finished	There are some actions that are blocking the game (exiting from newgrf window, loading a game, taking a giant screenshot...) for a prolonged period of time. It would be nice to put these actions to a separate thread, or at least change the mouse cursor to "Zzzz". Game startup time can be very long, especially if newgrfs are used. User should see that the game is loading. Ideal would be a "progress bar". (Now implemented.)
Change data directory in config file		Unclaimed	Sometimes it is not possible to compile the path to the data files into the binary. Then it should be possible to change the data path through the config file. Currently this is not possible because the config file is parsed after some game data was already loaded. The Nintendo DS port has a workaround for this. It checks the config file first it a data path was specified and later parses it.
Redefinable controls		Partly finished	Hotkeys are configurable via hotkeys.cfg, but there's no GUI. Smartphones and tablets support landscape and portrait orientations. Different keybindings should be possible for the two modes.

Folder: Compilation and Ports