path: root/src/lib/fake-quartz-cg.h

/**
 * libgamma -- Display server abstraction layer for gamma ramp adjustments
 * Copyright (C) 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/>.
 */
#ifndef LIBGAMMA_FAKE_QUARTZ_CG_H
#define LIBGAMMA_FAKE_QUARTZ_CG_H

#ifndef FAKE_LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS
# error Including fake-quartz-cg.h without FAKE_LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS
#endif


/* This header file contains some capabilities of
 * <CoreGraphics/CGDirectDisplay.h> and <CoreGraphics/CGError.h>,
 * and can be used modify gamma ramps without Mac OS X and Quartz
 * but with its API.
 * 
 * The content of this file is based on the documentation found on:
 * 
 * https://developer.apple.com/library/mac/documentation/GraphicsImaging/Reference/Quartz_Services_Ref/Reference/reference.html
 * 
 * https://developer.apple.com/library/mac/documentation/CoreGraphics/Reference/CoreGraphicsConstantsRef/Reference/reference.html#//apple_ref/c/tdef/CGError */


#include <stdint.h>


typedef int32_t CGError;
#define kCGErrorSuccess 0

typedef float CGGammaValue;
typedef uint32_t CGDirectDisplayID;


CGError CGGetOnlineDisplayList(uint32_t max_size,
			       CGDirectDisplayID* restrict displays_out, uint32_t* restrict count_out);

CGError CGSetDisplayTransferByTable(CGDirectDisplayID display, uint32_t gamma_size, const CGGammaValue* red,
				    const CGGammaValue* green, const CGGammaValue* blue);

CGError CGGetDisplayTransferByTable(CGDirectDisplayID display, uint32_t gamma_size,
				    CGGammaValue* restrict red, CGGammaValue* restrict green,
				    CGGammaValue* restrict blue, uint32_t* restrict gamma_size_out);

void CGDisplayRestoreColorSyncSettings(void);

uint32_t CGDisplayGammaTableCapacity(CGDirectDisplayID display) __attribute__((const));


/* The follow part most only be used when this module is used,
 * it cannot be used when the real CoreGraphics is used.
 * CoreGraphics does not have this function, it is added so
 * that there is a way to cleanly close the X connection
 * and free resources needed by this module. */
void close_fake_quartz_cg(void);


#endif