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/**
* jlibgamma — Display server abstraction layer for gamma ramp and Java
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
package libgamma;
/**
* Partition state.
*
* Probably the majority of display server only one partition
* per site. However, X.org can, and traditional used to have
* on multi-headed environments, multiple partitions per site.
* In X.org partitions are called 'screens'. It is not to be
* confused with monitor. A screen is a collection of monitors,
* and the mapping from monitors to screens is a surjection.
* On hardware-level adjustment methods, such as Direct
* Rendering Manager, a partition is a graphics card.
*/
public class Partition
{
/**
* Type initialiser.
*/
static
{
Libgamma.initialise();
}
/**
* Constructor.
*
* @param site The site this partition belongs to.
* @param partition The index of the partition.
*/
public Partition(Site site, int partition) throws LibgammaException
{
this.site = site;
this.partition = partition;
long[] r = libgamma_partition_create(site.address, partition);
this.address = r[0];
this.crtcs_available = (int)(r[1]);
if (r[2] != 0)
throw new LibgammaException((int)(r[2]));
}
/**
* The site this partition belongs to.
*/
public final Site site;
/**
* The index of the partition.
*/
public final int partition;
/**
* The number of CRTC:s that are available under this
* partition. Note that the CRTC:s are not necessarily
* online.
*/
public final int crtcs_available;
/**
* The address of the native object.
*/
final long address;
/**
* Release resources.
*/
public void close()
{
libgamma_partition_free(this.address);
}
/**
* Restore the gamma ramps all CRTC:s within the partition to the system settings.
*/
public void restore() throws LibgammaException
{
int r = libgamma_partition_restore(this.address);
if (r != 0)
throw new LibgammaException(r);
}
/**
* Create a partition state.
*
* @param site The site state for the site that the partition belongs to.
* @param partition The index of the partition within the site.
* @return Element 0: The value for {@link #address}.
* Element 1: The value for {@link #crtcs_available}
* Element 2: Error code, zero on success.
*/
private static native long[] libgamma_partition_create(long site, int partition);
/**
* Release all resources held by a partition state
* and free the partition state pointer.
*
* @param address The partition state.
*/
private static native void libgamma_partition_free(long address);
/**
* Restore the gamma ramps all CRTC:s within a partition to the system settings.
*
* @param address The partition state.
* @return Zero on success, and error code on failure.
*/
private static native int libgamma_partition_restore(long address);
}
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