Rockbox

This patch was meant to add a DJ type feature, that would announce each song if a “.talk” clip exists for it. Unfortunately, it’s not as simple as calling talk_file() each time the track changes, because that breaks playback because of CPU inadequacy. Works mostly fine for WAV files though.

The solution is probably to halt playback until the clip has been played, but that’s beyond me.

I have not added a settings interface to this, since the feature is really very incomplete. I’d love if someone would pick it up from here though.

I found  FS#8521 (permanent pitch setting) can successfully combined with mpeg player.
Add  FS#8521  and some fix, we can use pitch function in mpeg player. This means, we can control mpeg play speed.

With  FS#8894 (speed control without pitch change) can produce similar effect and more attractive, but  FS#8894  have serious problem with gigabeat s30 and require more processer power and have lower sound quality.

This patch can patched with  FS#8607 (mpegplayer playlist).

It would be nice if the “Generate” menu-option opened a submenu where you could pick which difficulty to generate.

I’ve had a quick glance at the code, and it looks like it’d have to generate until a suitable difficulty is found, but that’s no different from what users have to do now, if they’re after a specific difficulty, except it’d happen automatically.

If I get the time/motivation, I may have another look at it in the next couple of days.

this patch is a WIP to update the bookmark system.

the change is to save “resume points” into the current .playlist_control file and copy that as a .bmark file. Right now it works fine to load and save (And even list the bookmark resume points).

What doesn’t work yet (in bmark.3.diff) is the recent bookmarks menu item.

So far, the only downside I have found is that when you open a .bmark file the current playlist has to be stopped (it gets bookmarked automatically so if you cancel the .bmark it will resume anyway).
I’m hopeing that this isnt a big enough issue to reject the patch.

This patch will correct how thai vowels and tonal makers display.

After upgrading from 3.0 to 3.1, the “Beep” sound (enabled in Settings / Playback Settings / Beep Volume) now sounds very distorted and fuzzy.

It sounds this way on any setting. Strong, Moderate or Weak and with the player’s volume on any setting. It definitely sounded like a normal clean beep with 3.0

This is on an 80gb Ipod 5.5 with Rockbox r19569-081223

I’m not sure if this should be under “Music Playback”, as I don’t seem to hear the distortion and fuzziness when playing mp3’s.

Mike

EXTM3U is a format based on the standard m3u format. It adds a comment line before filename in .m3u or .m3u8 file in the format of
#EXTINF:xxx,yyy
where xxx is track length in seconds, yyy is the title.

For more info, see: http://hanna.pyxidis.org/tech/m3u.html

Supporting EXTM3U format has several potential benefits:
1. Instead of displaying filenames, track title and length can easily be viewed when viewing playlist (currently I think there is a patch that does it by opening each file).
2. Length of playlist can be readily calculated by summing, which can have some interesting applications such as finding how much time is left in current playlist. (Currently this is not possible yet with this patch, but I’m still thinking of possible solutions).

Of course, you have to have playlists in EXTM3U format to get the benefits. There are widely available tools to generate EXTM3U or add information to existing normal m3u playlists. In the future I might add functionality to Rockbox to save EXTM3U playlists (only if database is enabled and ready) or a plugin.

The current patch is able to parse EXTM3U information and use it in playlist viewer. To see it work, you have to set your track display option in the playlist menu to display EXTM3U information; otherwise, filename will be displayed. Two display options are added: title only and title plus track length.

This patch should have very minimal impact on normal playlist usage. A parse function and a few booleans values to existing structures are added, but the parsed title and filename share the same buffer (since they won’t be displayed at the same time). Specifically, beside a quick initial reading of header to determine if a playlist is EXTM3U and a few boolean checks, current playlist parsing/viewing routines are not changed if playlist is not EXTM3U or EXTM3U information is not needed for display.

Enough of me babbling :D Here is the patch. I did some limited testing, so it probably is not foul-proof yet.

This is v2 of the Rockbox plugin API documentation generator.

See the mailing list for more information ( http://www.rockbox.org/mail/archive/rockbox-dev-archive-2009-01/0040.shtml ).

An example of what the output looks like is available here: http://mcuelenaere.alwaysdata.net/rockbox_api_example_3/

This is a variant of an the classic Paratroopers.

It lacks the particles, planes and stacking men. Instead of solders, They're just falling bombs.

For more details about the source of inspiration:
http://en.wikipedia.org/wiki/Paratrooper_(video_game)

This patch is a continuation of FS#9879 and includes it (but adds something more). It adds the possibility to switch the lamp on and off without leaving the plugin.

Key mappings were taken from FS#8934.

As of r19940, the lamp plugin is quit by pressing any key besides some which have a function in that plugin (or so is the intention –see bug report  FS#9877 ).

This patch changes the plugin so that it’s left with a special button only. The patch also adds key definitions for some players that haven’t been included before (players without color LCD). Key mappings were taken from the patch in FS#8934.

Essentially, this patch implements an atomic part of that patch.

Also, correct handling of USB has been added.

This is in preparation of a (separate) patch for toggling the light on and off without leaving the plugin.

I was reading http://forums.rockbox.org/index.php?topic=17079.0 and thought I’d take a swing at it. So far, I have added (potentially shaky?) support for the ‘#’ comments in the file posted, allowing both Windows and Linux line ending formats, and longer filename support.
Still having problems with the white space after each entry, and detecting or assuming the presence of the file extension.

Hello,

This plugin is a game to be played in two.
I like to play go and pente and so is my wife (at least she plays pente) so I wrote this plugin.

I think the code is clear enough. I also used all the #ifdef that I knew.. so, I believe it wouldn’t break any compilation.

The plugin was tested on IPOD 5G (VIDEO) and works just fine. I also compiled it to a few more players without any problem.
I did not try to compile it for players that don’t have the lcd_update() function. It won’t work (at least this first version).

The board size in the LCD is based on WIDTH, since Sansa has width smaller than height you will lose part of the board (horizontally).
I just tested the code in sansa using the Simulator…

It is easy to fix and I will, but I’ll be traveling for a week (that’s why I wrote it, so I could play it while I wait in the airport/plane…) When I came back I will fix it.

Meanwhile, you guys can patch it or use it.
Feedbacks are also welcome.

Current Features:
- Save / Load games
- Pente / Go (Board 9×9, 13×13 and 19×19)
- Remove groups / stones automatically when they are dead

I attached the code and the “executable” for IPOD 5G (Video)

Enjoy!
Alex

First approach, to add dma read/write disk access to the sansa.

There are some restrictions on the dma functionality with this patch:
- only stabile at 80MHz ⇒ cpu boost control added to the driver
- only on 16byte aligned data ptr ⇒ all data are copied to/from aligned memory
- no interrupt support ⇒ using polling method

At 30MHz the driver is much more stable with the following PLL settings:
PLL_CONTROL = 0x8a221e0c; /* 30 MHz = (48MHz/12*30) / 4 */
CLOCK_SOURCE = 0×40007777; /* source #1, #2, #3, #4: PLL (#4 active) */

Reading seems to be in general more reliable than writing of the cards.
The data throughput is a little worse than in the current implementation.
This is partly due to the data copying.
The sporadical ‘2bytes inserted’ problem with the USB file transfer is still
there. Interestingly @30MHz with the above settings, there is another problem:
sporadically ‘2bytes missing’ and ‘2bytes inserted’. Perhaps the DMA transfer
needs some more initialization for proper synchronization.

“First Keypress Enables Backlight Only” doesn’t work on the 5G iPod. For example, if that’s enabled, the backlight is off and I press next track while at the WPS, Rockbox will go to the next track.

It seems like clickwheel event(s) generated when I touch the wheel turn on the backlight. When the button is pressed, the backlight is already considered to be on and the button press performs its usual action. If I carefully hold my finger still on the clickwheel, let the backlight fade, and then carefully press a button without moving my finger on the clickwheel, I am able to turn on the backlight without causing anything else to happen.

I don’t know what to do about this. Requiring a physical button press might be annoying. Removing this option on affected targets might be okay, because it’s easy to turn on the backlight by touching the clickwheel (and that doesn’t seem to cause anything else to happen). Another possibility is to require more or specific wheel events.

I set player type to iPod 5G because that’s all I have, but I expect this problem also exists on other clickwheel iPods. This problem exists on r20079 and r20033.

The H10 5G MTP needs a different bootloader than the UMS version (see http://www.rockbox.org/twiki/bin/view/Main/IriverH10PortDevInfo#Build_a_Rockbox_Bootloader).
I’m not sure about the correct way to do this in configure, so I’ll leave it to someone who is.

This patch puts the pacbox emulator onto the cop, leaving the main cpu for audio codec. The COP behaviour is controller by a #define in pacbox.h

If PACBOX_ON_COP is defined, then all iram usage is also turned off, to prevent interference with audio thread.

Additionally, this patch adds an Audio menu (using the playback_control library), which is enabled for all PACBOX_ON_COP and GIGABEAT F-Series builds.

Patch from directly within the apps/plugins/pacbox directory.

This is the first step of being able to use the pictureflow plugin from a database search. The database now indexes the path to the coverimage for each audio file. In the database browser you can select “Cover by...” genre, artist, composer, year or all and will be presented with a list of cover image paths. (Imagine a call to the pictureflow plugin at this stage, so instead of a list of boring paths you get nice and shiny images). After selecting a path it will display the list of files that would be queued when a cover image is picked in the plugin.

Next step is to work out how to safely call the plugin without losing the context and utilise the return value from it to queue the files.

Issues so far are:

- the preferred size of 100×100 is hardcoded (this should be configurable or at least be consistent with the value in the pictureflow
the db update for covers has the same restrictions as the other tags, i.e. it will only detect changed cover art on
the coverflow plugin needs to work while music is playing (or stop playback if needs
since there is no guaranteed relation between album name and image file, the album name can’t be displayed

Here is a preliminary patch for TV out on a 5th generation iPod. Play a BMP file and TV out will activate. NTSC is the default. If the file has 576 lines, the output will be in PAL. The image stays until another is loaded or TV output is disabled via the debug menu..

The following formats ought to work:
720×480, 24 bpp for NTSC
720×576, 24 bpp for PAL
Many programs including Windows Paint and ImageMagick convert can write such files. Other resolutions and bit depths may work. For example WPS background screens display properly but other WPS bitmaps don’t.

Known issues:
- More work needs to be done to integrate this with Rockbox. No, you cannot view the Rockbox interface, JPEGs or mpegplayer output yet.
- When the LCD is updated, there is a temporary disturbance on TV output
- http://en.wikipedia.org/wiki/Macrovision#Analog_copy_prevention is enabled. Yes, the hardware can disable it, but I haven’t figured out how to do that yet.
- The original firmware probably outputs images differently. It can load programs into the BCM which perform decoding there, and that is probably faster.

This patch attempts to permanently fix the inconsistent mixture of “Title Case” and “Sentence case” in english.lang by applying “Sentence case” to the entire file.

I suggested we do this in a post to the rockbox-dev mailing list last year, but that just ended in a very split discussion with no conclusion.

I’m not sure if this patch wil result in anything different, but I made it for my own use, and thought I would post it, as there were a fair number of posters to that discussion that also prefered sentence case.

The old discussion:

http://www.rockbox.org/mail/archive/rockbox-dev-archive-2008-08/0034.shtml

EDIT: I forgot to say this patch also changes a couple of uses of “center” to “centre”…

This patch will make an e200 present its SD card as an ipod mini 2G when queried by iTunes. It does this by changing a number of things:

1) Responding to SCSI inqueries
2) Using Ipod USB vid/pid and other usb details

The patch also enables logf for the usb_storage.c because I’m in a bit of a hurry.

To use this, make sure you have a partition on the SD card of type 0 (any size should do) and also the appropriate Ipod file structure (can be generated with e.g. gtkpod).

I’ve noticed that many plugins don’t have the Playback Control menu even though they could. I’m going to have a go at fixing that.

I’ve categorised the plugins which could use the menu like so:

Already have a standard-ish menu (not bitmap), it just needs to be added:
bubbles
chessbox
chopper
minesweeper
reversi
superdom
wormlet
xobox
clock
fireworks
vu_meter

These are the easiest case, it’s just a matter of adding the menu item.

Don’t have a menu that makes sense to add Playback Control to (either they don’t have a menu at all, or they only have a start-menu that can’t be usefully returned to):
flipit
invadrox
maze
robotfindskitten
rockblox
rockblox1d
rocklife
sliding_puzzle
snake
snake2
spacerocks
star
stopwatch
mandelbrot
oscilloscope

These are a mixed bunch. Some could actually use a menu, and some could just have a key assigned to bring up the Playback Control menu. More involved than the first bunch in general.

Already have a menu, but it’s really custom in some way. They either need to be switched to more standard menus, or something special needs to be done:
brickmania
chessclock
pegbox
rockpaint

These will probably be the most work.

Let me know if I forgot any plugins, or if you think it doesn’t make sense to add the menu to a plugin that I’ve listed above.

Attached is a patch for the first bunch. The others will be coming eventually.

I’d appreciate it if you leave this FS entry open until I get to the second and third bunch, even if the first bunch happens to get commited to svn.

It is a patch that can automatically output the result of logf to the
file.

The setting of default doesn’t output the result of the logf to the
file.
Please set and do the following when it is effective.

System > Debug > logf auto file output: select "Yes"

this is an attempt to implement the idea suggested in the forum (http://forums.rockbox.org/index.php?topic=20120.0).
I take values from “skip length” setting for variable steps.

This first patch is a merge of Tremolo’s bitwise.c and bitwiseARM.s code into rockbox libtremor. As a naive version of the merge, I have taken out the previous rockbox optimisations to huffman decode (originally implemented in  FS#6848 ). Versus svn, decoding speed is worse with this patch. However something that incorporates both  FS#6848  and the Tremolo bitwise optimisations for little-endian ARM may well turn out better. This patch is seriously not committable, the arch-specific stuff is not done cleanly in the headers or the makefile

I’ve been reliably informed that Rockbox should stop scrolling when it gets to the bottom or top of a menu, only to wrap around when you initiate a new scrolling gesture. On a 2nd Generation iPod, however, it just keeps scrolling.

See http://bertram.bourdrez.org/buggyrockbox.avi (the video is recorded with an old Rockbox, but 3.2-090323 does the same thing)

Also, the bug tracking system is overcomplicated. I have to register an account?!
“Why the hell should *I* set up an account? It’s not like any bugs will be assigned to me or anything. Just store my e-mail address and move on. It’s completely fucking bogus that I should have to go digging through my mail for confirmation passwords.” (http://zork.net/~sneakums/fortunes/gar/215)

Then I have to click a link with a magic number in it *as well as* having to enter a confirmation code from the same email (!?) and then when I’ve finished, I’m not even logged in! I have to log in with the same password I just set! Can’t it just set a cookie?

I put up the three patches (before they expire on pastebin.com) that correspond to the three proposals of how the behaviour of PREV/NEXT could/should be changed. Note that only the situation described in the “subject” of this task is considered and changed.

The IRC discussion is at http://www.rockbox.org/irc/log-20090406#21:35:42

The start of the discussion on the mail list is at http://www.rockbox.org/mail/archive/rockbox-dev-archive-2009-04/0057.shtml

This IS a duplicate of  FS#6904 .

My iaudio x5 hangs when changing directories via short+long direction button presses. It switches to the next directory, but no audio plays, and the WPS shows that it stops at 0:02 of the track.

FingersOfRock is a DDR variant where by arrows pass over the screen, and the player must press the corresponding buttons in time.

I don’t know how to use the cpu boost, so if someone has some time, please boost when the game begins and un-boost when it finishes.

It is called FingersOfRock from: FretsOfFire and rockbox.

For more details on the source of inspiration:
http://en.wikipedia.org/wiki/Dance_Dance_Revolution

This is a new plugin that mimics the open source PC program mnemosyne (http://www.mnemosyne-proj.org/), a program that assists with memorizing flash cards. The plugin is fully functional, but it still needs a menu and assumes that the user has setup the folders it needs for storing cards before running (if you don’t create them it will crash). I’ll fix these issues in the near future, but in the mean time any feedback is appreciated :)

Sometimes when I shut my unit off and then turn it on again and resume playback, RB resumes from a different place than where it left off, and even though when I resume shuffle is on (as indicated by its icon), it isn’t. It’ll play the current track, then the next track in the playlist (which in my case is in order by track number, so it’ll play the next track on the album), and so on.

If I turn shuffle off and then on again, shuffle works correctly again.

I’m using a build from January 19 (19800-090119) on an Archos Recorder. I
noticed this bug occurring in the 3.1 build as well.

It seems to happen randomly – I can’t figure out anything specifically that I can do to always make it happen.

firmware/export/usb_ch9.h comes from linux (include/linux/usb/ch9.h) with only trivial changes. The original doesn’t mention a specific license, so it probably is GPLv2
file basically contains only structure declarations and defines for things straight from the USB specification though, so I’m not sure if there is a real problem.

I brutally hacked the Oscilloscope to pieces and tried to make an x-y scope.

Please feel free to edit and contribute because I honestly have very limited knowledge of PCM data and the inner workings of rockbox =]

If LCD_SLEEP is put on the backlight queue immediatly after BACKLIGHT_ON, the LCD will go to sleep immediately after the backlight turns on. On the 5G iPod, the next backlight_on() call will wake it, but on some other targets it might not wake again.

For example, consider the following sequence of events:
1) backlight_on() is called, putting BACKLIGHT_ON on the queue
2) The LCD sleep timeout from the previous backlight shutoff puts LCD_SLEEP on the queue
3) BACKLIGHT_ON is received and the backlight is turned on. The call of backlight_lcd_sleep_countdown(false) does nothing about the LCD_SLEEP on the queue.
5) The LCD_SLEEP is received, putting the LCD to sleep again.

This patch causes LCD_SLEEP to be ignored by backlight_thread() when the backlight is on. It also removes a workaround from 5G iPod LCD sleep code.

This issue is theoretical and very improbable. I am not able to trigger this bug in r20774.

This is an attempt to automate the setting of $PATH in tools/rockboxdev.sh, tools/configure and the generated Makefile.

The directory prefix of the cross compilers is stored in ~/.config/rockbox.org/RockboxCompilerPrefix. As the default path (in tools/rockboxdev.sh) is /usr/local, if that file is empty, then $PATH won’t be modified. Otherwise, the value stored inside that file will be read, the target platform type appended, and lastly /bin appended. The resulting string will be appended to $PATH.

This patch doesn’t break existing configuration. But it’s most probably incomplete, so please provide feedback on which files need to be modified as well.

Setting the Idle Poweroff setting seems to work just fine initially because the player ceases to respond to any input. However, when you push the power button back up to turn it on, the screen lights up and says “Shutting down…” for a few seconds before actually powering off. You then have to push the power button back on to turn it on proper.

Since FM stations list may require that the FM region is set to a certain value, it would be good if the FM region could be set along with the station list. The patch does just that.

The region is set by putting the line “region:N” into the FMR file (at any line there). N can be one of the values allowed for the fm_region setting.

The patch does not work on the simulators for e200 and h120 (the only two I tried) because, for some reason, the symbol HAVE_RADIO_REGION is not defined for them. Could anybody tell why?

Saving the region along with the station list is not implemented.

This patch removes the Repeat:Shuffle setting, and always reshuffles the playlist when Shuffle is set to yes and Repeat is set to All.

The rationale behind this is that a user would rarely want to shuffle the playlist the first time only and always repeat the same sequence afterwards. Rather, one would either play the playlist in order and repeat in the same order, or shuffle the playlist first and always reshuffle.

Setting combinations affected:
- Shuffle:Yes && Repeat:All

before: shuffle the playlist but repeats the same sequence
after: shuffle the playlist and reshuffles when the end is reached

- Shuffle:Yes && Repeat:Shuffle

before: shuffle the playlist and reshuffles when the end is reached
after: this combination is replaced by Shuffle:Yes && Repeat:All

- Shuffle:No && Repeat:Shuffle

before: reshuffle when the end is reached
after: rarely used combination, not available anymore

All other combinations are not affected.

The patch contains some comment fixes and some code simplification as well. We also have to handle a special case in the patch.

i asked some time ago why there is the buttontable in general settings –>bookmark. i wondered because the buttons are the same as in other lists. Marc Guay said "the delete button is unique", an i wondered why there is a dedicated delete button… in no other lists exists such a button afaik.

i changed the manual accordingly.
i also corrected some wrong (?) comments.
i hope i did everything right, at least for the e200 it compiles and works fine.

i would like to get some opinions about it.

It’s still a bit rough around the edges, but I’ve written a new game plugin called NBackBox. It’s an implementation of the dual-n-back exercise, discussed in this Wired article: http://www.wired.com/science/discoveries/news/2008/04/smart_software . In short, it’s a game that improves your brain’s working memory. I’ve tried to keep it as close to how the game was described in the original paper.

Any feedback/bug reports/code suggestions much appreciated :)

Joe

The aim of this patch is to make releases as simple as possible... i.e the end goal would be to have someone run “$ ~/rockbox/tools/release/release.sh 3.3” and that would do everything except feed the cat...

the first version just modifies bins.pl to accept a version number which eventually gets passed to the Makefile and used in the source to set the version string in the source to “3.x-rBLAAA”.

This also defines RBRELEASE which can be used in the source to do stuff, for example, remove the debug menu in releases (if we decide to do that...) (RELEASE is defined in speex so had to add the RB prefix...)

Also, this changes the way configure is run to use command line args instead of passing input to it which is Just Wrong (TM) :p

This very small patch simply plays a beep when a charger is removed or plugged in.
I know  FS#7910  voiced this but that was a bit annoying.

The charger stuff will be removed from p7910. I could have added this to it but it isn’t really that related.

Build 21245

I have ''Start Screen' set to 'Resume Playback'.

When connecting the Ipod (from OFF) to the PC the Ipod boots and USB mode starts but also playback (the play > sign is display on the title bar).

The Ipod is not shows and not mounted on the PC.

On disconnecting USB I get 'data abort' and have to hard reset.

When adding text via the keyboard, neither the selection function nor the done function work using the remote play button. Pressing 'play' on the main unit however, does work and has the correct behaviour.

I checked the keymap-m3.c source and I noticed that unlike the other entires, the last entry for these options refers to the main unit buttons and not the remote:

{ ACTION_KBD_SELECT, BUTTON_RC_PLAY|BUTTON_REL, BUTTON_PLAY },
{ ACTION_KBD_DONE, BUTTON_RC_PLAY|BUTTON_REPEAT, BUTTON_PLAY },

I changed the entries to the following:

{ ACTION_KBD_SELECT, BUTTON_RC_PLAY|BUTTON_REL, BUTTON_RC_PLAY },
{ ACTION_KBD_DONE, BUTTON_RC_PLAY|BUTTON_REPEAT, BUTTON_RC_PLAY },

After rebuilding and installing this change onto my M3 the keybord now works when using the remote.

Attached is the patch file for this change.

I know that the folks that added recording functions to the PP targets only did it as a proof-of-concept, which rteally works well already. I am curious if anyone has looked into the bizarre noise that is generated on the right channel, I have tested this on two different 4g grayscale ipods and on 5.5g ipod. The noise level is lower in the 5.5g than the 4g's. I have attatched a png of jamin running a "silent" recording (no mic connected) and the wavpack file. I amplified the sound to get it to register higher on my spectrum analyzer.

This plugin searches in the .rockbox/rocks/apps/drumkit directory for .raw sound files, loads them into memory, and assigns the keys to play them, creating a drumkit /sample trigger / instrument out of the player. Currently only designed for the Sansa e200.

Room for improvement:

- Add keymaps for all
Allow multiple samples to be played at the same time (by using
Allow for a variety of sound file types to be
Find a better name

Rockbox port of XAttax (which is in turn X port of some ancient arcade game). It’s a strategy game similar to Reversi, played agains AI opponent.

The rules should be obvious once you run it. You can place new stone next to you own stones, or you can move already placed stone over a cell. Moved or newly places stone changes color of all adjacent stones. The player who has more stones at the end wins.

To install, apply patch and unpack tar’ed sources. It should build successfuly on all LCD-based targets; please report in case build fails for your particular device so I could fix it.

Delete current file from within the jpeg viewer plugin.
Adds delete to the options in the menu
Also highlights the last file viewed in the file browser on quit.
GRaTT

This should hopefully make beatbox compile and run on any target with enough buttons.

All it needed was some key mappings (and some typo fixes). I’m assuming the function declaration for synthSamaples() simply changed over time, as the original code was missing an ‘s’ on the end of function name and looked like this:

  synthSamples(&synthtemp[0], &synthtemp[1]);

The second param should be the sample size or something, but it was passed an address.

If it doesn’t work on a particular target due to lack of a key map, please add one, or tell me the target and i’ll stick a keymap in

Patch from within root rockbox source folder.

Hopefully this works for you all, its many hours of fun =D

This patch adds a rotate option to the jpeg viewer.
Tested on sansa e200. Works on colour targets only.
Additional work required for zoom and moving around the pict.

GRaTT