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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;
/**
* Class of adjustment methods.
*/
public enum AdjustmentMethod
{
/**
* The identifier for the dummy adjustment method.
* This method can be configured and is useful for
* testing your program's ability to handle errors.
*/
DUMMY(0),
/**
* The identifier for the adjustment method with
* uses the RandR protocol under the X display server.
*/
X_RANDR(1),
/**
* The identifier for the adjustment method with
* uses the VidMode protocol under the X display server.
* This is an older alternative to RandR that can
* work on some drivers that are not supported by RandR,
* however it can only control the primary CRTC per
* screen (partition).
*/
X_VIDMODE(2),
/**
* The identifier for the Direct Rendering Manager
* adjustment method that is available in Linux
* (built in to the Linux kernel with a userland
* library for access) and is a part of the
* Direct Rendering Infrastructure. This adjustment
* method all work when you are in non-graphical
* mode; however a display server cannnot be
* started while this is running, but it can be
* started while a display server is running.
*/
LINUX_DRM(3),
/**
* The identifier for the Graphics Device Interface
* adjustment method that is available in Windows.
* This method is not well tested; it can be compiled
* to be available under X.org using a translation layer.
*/
W32_GDI(4),
/**
* The identifier for the CoreGraphics adjustment
* method that is available in Mac OS X that can
* adjust gamma ramps under the Quartz display server.
* This method is not well tested; it can be compiled
* to be available under X.org using a translation layer.
*/
QUARTZ_CORE_GRAPHICS(5)
;
/**
* The index of the last gamma method, neither it
* nor any index before it may actually be supported
* as it could have been disabled at compile-time
*/
public static final int MAX = 5;
/**
* The number adjustment methods provided by this library.
* Note however that this includes adjstment methods that
* have been removed at compile-time.
*/
public static final int COUNT = MAX + 1;
/**
* Adjustment methods by their numerical values.
*/
public static AdjustmentMethod[] VALUES =
{
DUMMY, X_RANDR, X_VIDMODE, LINUX_DRM, W32_GDI, QUARTZ_CORE_GRAPHICS
};
/**
* Constructor.
*
* @param value The numerical value of the adjustment method.
*/
private AdjustmentMethod(int value)
{
this.value = value;
}
/**
* The numerical value of the adjustment method.
*/
public final int value;
/**
* Check whether the adjustment method is available.
*
* @return Whether the adjustment method is available.
*/
public boolean is_available()
{
return libgamma_is_method_available(this.value) != 0;
}
/**
* Get the default site for the adjustment method.
*
* @return The default site for the adjustment method.
*/
public String default_site()
{
return libgamma_method_default_site(this.value);
}
/**
* Get the default variable that determines the default
* site for the adjustment method.
*
* @return default variable that determines the default
* site for the adjustment method.
*/
public String default_site_variable()
{
return libgamma_method_default_site_variable(this.value);
}
/**
* List available adjustment methods by their order of preference based on the environment.
*
* @param operation Allowed values:
* 0: Methods that the environment suggests will work, excluding fake.
* 1: Methods that the environment suggests will work, including fake.
* 2: All real non-fake methods.
* 3: All real methods.
* 4: All methods.
* Other values invoke undefined behaviour.
* @return List available adjustment methods by their order of preference.
*/
public static AdjustmentMethod[] list_methods(int operation)
{
int[] methods = libgamma_list_methods(operation);
AdjustmentMethod[] rc = new AdjustmentMethod[methods.length];
for (int i = 0; i < methods.length; i++)
rc[i] = VALUES[methods[i]];
return rc;
}
/**
* List available adjustment methods by their order of preference based on the environment.
*
* @param operation Allowed values:
* 0: Methods that the environment suggests will work, excluding fake.
* 1: Methods that the environment suggests will work, including fake.
* 2: All real non-fake methods.
* 3: All real methods.
* 4: All methods.
* Other values invoke undefined behaviour.
* @return List available adjustment methods by their order of preference.
*/
private static native int[] libgamma_list_methods(int operation);
/**
* Check whether an adjustment method is available, non-existing (invalid) methods will be
* identified as not available under the rationale that the library may be out of date.
*
* @param method The adjustment method.
* @return Whether the adjustment method is available.
*/
private static native int libgamma_is_method_available(int method);
/**
* Return the default site for an adjustment method.
*
* @param method The adjustment method (display server and protocol.)
* @return The default site, {@code null} if it cannot be determined or
* if multiple sites are not supported by the adjustment method.
*/
private static native String libgamma_method_default_site(int method);
/**
* Return the default variable that determines
* the default site for an adjustment method.
*
* @param method The adjustment method (display server and protocol.)
* @return The environ variables that is used to determine the
* default site. {@code null} if there is none, that is,
* if the method does not support multiple sites.
*/
private static native String libgamma_method_default_site_variable(int method);
}
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