/**
* 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/>.
*/
#include "blueshift_quartz_c.h"
/**
* The number of CRTC:s on the system
*/
static uint32_t crtc_count = 0;
/**
* The CRTC:s on the system
*/
static CGDirectDisplayID* crtcs = NULL;
/**
*/
static uint32_t* gamma_sizes = NULL;
/**
* Start stage of colour curve control
*
* @return Zero on success
*/
int blueshift_quartz_open(void)
{
uint32_t cap = 4;
uint32_t i;
CGError r;
crtcs = malloc((size_t)cap * sizeof(CGDirectDisplayID));
if (crtcs == NULL)
{
perror("malloc");
return -1;
}
for (;;)
{
r = CGGetOnlineDisplayList(cap, crtcs, &crtc_count);
if (r != kCGErrorSuccess)
{
free(crtcs);
crtcs = NULL;
close_fake_quartz();
}
if (crtc_count == cap)
{
cap <<= 1;
if (cap == 0) /* We could also test ~0, but it is still too many. */
{
fprintf(stderr, "An impossible number of CRTC:s are available according to Quartz\n");
free(crtcs);
close_fake_quartz();
return -1;
}
crtcs = realloc(crtcs, (size_t)cap * sizeof(CGDirectDisplayID));
if (crtcs == NULL)
{
perror("realloc");
close_fake_quartz();
return -1;
}
}
else
break;
}
if (crtc_count > 0)
{
gamma_sizes = malloc((size_t)crtc_count * sizeof(uint32_t));
if (gamma_sizes == NULL)
{
perror("malloc");
free(crtcs);
close_fake_quartz();
return -1;
}
for (i = 0; i < crtc_count; i++)
{
gamma_sizes[i] = CGDisplayGammaTableCapacity(crtcs[i]);
if (gamma_sizes[i] < 2)
{
fprintf(stderr, "Quartz reported impossibly small gamma ramps.\n");
free(gamma_sizes);
free(crtcs);
close_fake_quartz();
return -1;
}
}
}
return 0;
}
/**
* Get the number of CRTC:s on the system
*
* @return The number of CRTC:s on the system
*/
int blueshift_quartz_crtc_count(void)
{
return (int)crtc_count;
}
/**
* Gets the current colour curves
*
* @param use_crtc The CRTC to use
* @return {the size of the each curve, *the red curve,
* *the green curve, *the blue curve},
* needs to be free:d. `NULL` on error.
*/
uint16_t* blueshift_quartz_read(int use_crtc)
{
if ((use_crtc < 0) || (use_crtc >= (int)crtc_count))
{
fprintf(stderr, "CRTC %i does not exist\n", use_crtc);
return NULL;
}
else
{
uint32_t gamma_size = gamma_sizes[use_crtc];
uint16_t* rc = malloc((1 + 3 * (size_t)(gamma_size)) * sizeof(uint16_t));
uint32_t i;
CGGammaValue* red;
CGGammaValue* green;
CGGammaValue* blue;
CGError r;
uint32_t _;
if (rc == NULL)
{
perror("malloc");
return NULL;
}
red = malloc((3 * (size_t)gamma_size) * sizeof(CGGammaValue));
green = red + (size_t)gamma_size;
blue = green + (size_t)gamma_size;
if (red == NULL)
{
perror("malloc");
free(rc);
return NULL;
}
r = CGGetDisplayTransferByTable(crtcs[use_crtc], gamma_size, red, green, blue, &_);
if (r != kCGErrorSuccess)
{
fprintf(stderr, "Failed to get gamma ramps for CRTC %i\n", use_crtc);
free(red);
free(rc);
return 0;
}
*rc++ = gamma_sizes[use_crtc];
for (i = 0; i < gamma_size; i++)
{
int32_t v = red[i] * UINT16_MAX;
rc[i] = (uint16_t)(v < 0 ? 0 : v > UINT16_MAX ? UINT16_MAX : v);
}
rc += gamma_size;
for (i = 0; i < gamma_size; i++)
{
int32_t v = green[i] * UINT16_MAX;
rc[i] = (uint16_t)(v < 0 ? 0 : v > UINT16_MAX ? UINT16_MAX : v);
}
rc += gamma_size;
for (i = 0; i < gamma_size; i++)
{
int32_t v = blue[i] * UINT16_MAX;
rc[i] = (uint16_t)(v < 0 ? 0 : v > UINT16_MAX ? UINT16_MAX : v);
}
return rc - (1 + 2 * gamma_size);
}
}
/**
* Apply stage of colour curve control
*
* @param use_crtc The CRTC to use, -1 for all
* @param r_curve The red colour curve
* @param g_curve The green colour curve
* @param b_curve The blue colour curve
* @return Zero on success
*/
int blueshift_quartz_apply(int use_crtc, float* r_curves, float* g_curves, float* b_curves)
{
if (use_crtc < (int)crtc_count)
{
int c = use_crtc < 0 ? 0 : use_crtc;
int n = use_crtc < 0 ? (int)crtc_count : (use_crtc + 1);
CGError r = kCGErrorSuccess;
for (; c < n; c++)
{
r = CGSetDisplayTransferByTable(crtcs[c], gamma_sizes[c], r_curves, g_curves, b_curves);
if (r != kCGErrorSuccess)
{
fprintf(stderr, "Failed to set gamma ramps for CRTC %i\n", c);
break;
}
}
return r != kCGErrorSuccess;
}
fprintf(stderr, "CRTC %i does not exist\n", use_crtc);
return -1;
}
/**
* Resource freeing stage of colour curve control
*/
void blueshift_quartz_close(void)
{
if (crtcs != NULL)
free(crtcs);
if (gamma_sizes != NULL)
free(gamma_sizes);
close_fake_quartz();
}
/**
* Restore all gamma curves (on each and every CRTC on the system)
* to the settings on ColorSync
*/
void blueshift_quartz_restore(void)
{
CGDisplayRestoreColorSyncSettings();
}
