path: root/src/fake_quartz.h

/**
 * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
 * 
 * This program 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 program 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 program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef BLUESHIFT_FAKE_QUARTZ_H
#define BLUESHIFT_FAKE_QUARTZ_H


/* 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* displays_out, uint32_t* 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* red,
				    CGGammaValue* green, CGGammaValue* blue, uint32_t* 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(void);


#endif