[android-developers] Question: are Math.getExponent and Math.scalb supported on Android?
Hi,
As an experiment, I am trying to port a virtual machine written in
Java to Android platform. However, it heavily uses some special
floating point functions, like getting the exponent, or multiplying a
floating point by a power of 2. These are done with new Java Math
functions scalb and getExponent. It appears that they can be done by
manipulating the binary representation of the floating points.
However, because these functions don't seem to be available on Android
yet (are they?), all I could think of is implementing them with other
functions, like
public static float scalb(float f, int scaleFactor) {
return f * Math.pow(2, scaleFactor);
}
public static int getExponent(float f) {
return (int) (Math.log(f)/Math.log(2));
}
The question is... if the library doesn't have stock scalb and
getExponent functions, but the code is compiled with a new Java SDK
supporting the new math functions, could the Java compiler still
figure out a way to optimize these functions and operate on the binary
numeric level?
Thanks,
Danke
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[android-developers] Re: Android VNC server
Hi Anil, In case you were asking how the server passed the options to the client, this would be done by the libvncserver during the handshake. Before starting the server, the file fbvncserver.c needed to configure some options, and the resolution is obtained through an ioctl call to the /dev/graphics/fb0 device. Please check if that was an issue. Thanks, Danke On Aug 3, 9:19 pm, Danke Xie danke@gmail.com wrote: Hi Anil, Thanks for the feedback. Because the client gets the resolution and color depths from the server, we probably don't need to set the resolution on the client (hopefully). I used several vnc clients, and they can all get the resolution from the server, so I haven't tried to force a specific resolution at the client (i could find out how to do so though). I guess if the client didn't get the right resolution/ color depth, it may mean that the server didn't get them right either. Did you check the printout when the server starts up? Does it show the right resolution? If not, can you please turn on DEBUG and DEBUG_VERBOSE and send me the logs? Regards, Danke On Aug 2, 11:55 pm, Anil Sasidharan anil...@gmail.com wrote: Hi Danke, Great job. I've pulled your sources and re-built with Android-eclair. I'm able to deploy and run the vnc server on my target board. However there is some incompatibility in terms of color/pixel depth between my target and host-PC and because of which the vncviewer shows garbled display. The configuration of the target platform's display is 480x800 and 16bpp. Please provide some tips on what config options to be passed to vncviewer. Warm Regards, Anil On Mon, Aug 2, 2010 at 12:49 AM, Danke Xie danke@gmail.com wrote: I put together a vnc server for Android. It is based on some existing source scattered around like fbvncserver.c, but didn't really work. I have fixed up a few issues like missing frames, keyboard and mouse input support, and made it a bit faster. Can anyone try it and give me some feedback on any issues that you may find? The source/doc is hosted onhttp://code.google.com/p/fastdroid-vnc/ Thanks Danke -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.comandroid-developers%2Bunsubs cr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Android VNC server
Hi Anil, Thanks for the feedback. Because the client gets the resolution and color depths from the server, we probably don't need to set the resolution on the client (hopefully). I used several vnc clients, and they can all get the resolution from the server, so I haven't tried to force a specific resolution at the client (i could find out how to do so though). I guess if the client didn't get the right resolution/ color depth, it may mean that the server didn't get them right either. Did you check the printout when the server starts up? Does it show the right resolution? If not, can you please turn on DEBUG and DEBUG_VERBOSE and send me the logs? Regards, Danke On Aug 2, 11:55 pm, Anil Sasidharan anil...@gmail.com wrote: Hi Danke, Great job. I've pulled your sources and re-built with Android-eclair. I'm able to deploy and run the vnc server on my target board. However there is some incompatibility in terms of color/pixel depth between my target and host-PC and because of which the vncviewer shows garbled display. The configuration of the target platform's display is 480x800 and 16bpp. Please provide some tips on what config options to be passed to vncviewer. Warm Regards, Anil On Mon, Aug 2, 2010 at 12:49 AM, Danke Xie danke@gmail.com wrote: I put together a vnc server for Android. It is based on some existing source scattered around like fbvncserver.c, but didn't really work. I have fixed up a few issues like missing frames, keyboard and mouse input support, and made it a bit faster. Can anyone try it and give me some feedback on any issues that you may find? The source/doc is hosted onhttp://code.google.com/p/fastdroid-vnc/ Thanks Danke -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.comandroid-developers%2Bunsubs cr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Android VNC server
I put together a vnc server for Android. It is based on some existing source scattered around like fbvncserver.c, but didn't really work. I have fixed up a few issues like missing frames, keyboard and mouse input support, and made it a bit faster. Can anyone try it and give me some feedback on any issues that you may find? The source/doc is hosted on http://code.google.com/p/fastdroid-vnc/ Thanks Danke -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
