/**
* libgamma — Display server abstraction layer for gamma ramp adjustments
* 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/>.
*/
#include "gamma-helper.h"
#include "libgamma-method.h"
#include "libgamma-error.h"
#include <errno.h>
#include <stdlib.h>
#include <stdint.h>
/**
* Just an arbitrary version
*/
#define ANY bits64
#define __translate(instruction) for (i = 0; i < n; i++) instruction; break
/**
* Convert any set of gamma ramps into a 64-bit integer array with all channels.
*
* @param depth The depth of the gamma ramp, `-1` for `float`, `-2` for `double`.
* @param n The grand size of gamma ramps (sum of all channels' sizes.)
* @param out Output array.
* @param in Input gamma ramps.
*/
static void translate_to_64(signed depth, size_t n, uint64_t* restrict out, libgamma_gamma_ramps_any_t in)
{
size_t i;
switch (depth)
{
/* Translate integer. */
case 16: __translate(out[i] = (uint64_t)(in.bits16.red[i]) * 0x0001000100010001ULL);
case 32: __translate(out[i] = (uint64_t)(in.bits32.red[i]) * 0x0000000100000001ULL);
/* Identity translation. */
case 64: __translate(out[i] = in.bits64.red[i]);
/* Translate floating point. */
case -1: __translate(out[i] = (uint64_t)(in.float_single.red[i] * (float)UINT64_MAX));
case -2: __translate(out[i] = (uint64_t)(in.float_double.red[i] * (double)UINT64_MAX));
default:
/* This is not possible. */
abort();
break;
}
}
/**
* Undo the actions of `translate_to_64`.
*
* @param depth The depth of the gamma ramp, `-1` for `float`, `-2` for `double`.
* @param n The grand size of gamma ramps (sum of all channels' sizes.)
* @param out Output gamma ramps.
* @param in Input array, may be modified.
*/
static void translate_from_64(signed depth, size_t n, libgamma_gamma_ramps_any_t out, uint64_t* restrict in)
{
size_t i;
switch (depth)
{
/* Translate integer. */
case 16: __translate(out.bits16.red[i] = (uint16_t)(in[i] / 0x0001000100010001ULL));
case 32: __translate(out.bits32.red[i] = (uint32_t)(in[i] / 0x0000000100000001ULL));
/* Identity translation. */
case 64: __translate(out.bits64.red[i] = in[i]);
/* Translate floating point. */
case -1: __translate(out.float_single.red[i] = (float)(in[i]) / (float)UINT64_MAX);
case -2: __translate(out.float_double.red[i] = (double)(in[i]) / (double)UINT64_MAX);
default:
/* This is not possible. */
abort();
break;
}
}
/**
* Allocate and initalise a gamma ramp with any depth.
*
* @param ramps_sys Output gamma ramps.
* @param ramps The gamma ramps whose sizes should be duplicated.
* @param depth The depth of the gamma ramps to allocate,
* `-1` for `float`, `-2` for `double`.
* @param elements Output reference for the grand size of the gamma ramps.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library.
*/
static int allocated_any_ramp(libgamma_gamma_ramps_any_t* restrict ramps_sys,
libgamma_gamma_ramps_any_t ramps, signed depth, size_t* restrict elements)
{
/* Calculate the size of the allocation to do. */
size_t d, n = ramps.ANY.red_size + ramps.ANY.green_size + ramps.ANY.blue_size;
switch (depth)
{
case 16: d = sizeof(uint16_t); break;
case 32: d = sizeof(uint32_t); break;
case 64: d = sizeof(uint64_t); break;
case -1: d = sizeof(float); break;
case -2: d = sizeof(double); break;
default:
return errno = EINVAL, LIBGAMMA_ERRNO_SET;
}
/* Copy the gamma ramp sizes. */
ramps_sys->ANY = ramps.ANY;
/* Allocate the new ramps. */
ramps_sys->ANY.red = malloc(n * d);
ramps_sys->ANY.green = (void*)(((char*)(ramps_sys->ANY. red)) + ramps.ANY. red_size * d / sizeof(char));
ramps_sys->ANY.blue = (void*)(((char*)(ramps_sys->ANY.green)) + ramps.ANY.green_size * d / sizeof(char));
/* Report the total gamma ramp size. */
*elements = n;
/* Report successfulness. */
return ramps_sys->ANY.red == NULL ? LIBGAMMA_ERRNO_SET : 0;
}
/**
* Get current the gamma ramps for a CRTC, re-encoding version.
*
* @param this The CRTC state.
* @param ramps The gamma ramps to fill with the current values.
* @param depth_user The depth of the gamma ramps that are provided by the user,
* `-1` for `float`, `-2` for `double`.
* @param depth_system The depth of the gamma ramps as required by the adjustment method,
* `-1` for `float`, `-2` for `double`.
* @param fun Function that is to be used read the ramps, its parameters have
* the same function as those of this function with the same names,
* and the return value too is identical.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library.
*/
int libgamma_translated_ramp_get_(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps_any_t* restrict ramps,
signed depth_user, signed depth_system,
libgamma_get_ramps_any_fun* fun)
{
size_t n;
int r;
libgamma_gamma_ramps_any_t ramps_sys;
uint64_t* restrict ramps_full;
/* Allocate ramps with proper data type. */
if ((r = allocated_any_ramp(&ramps_sys, *ramps, depth_system, &n)))
return r;
/* Fill the ramps. */
if ((r = fun(this, &ramps_sys)))
return free(ramps_sys.ANY.red), r;
/* Allocate intermediary ramps. */
if ((ramps_full = malloc(n * sizeof(uint64_t))) == NULL)
return free(ramps_sys.ANY.red), LIBGAMMA_ERRNO_SET;
/* Translate ramps to 64-bit integers. */
translate_to_64(depth_system, n, ramps_full, ramps_sys);
free(ramps_sys.ANY.red);
/* Translate ramps to the user's format. */
translate_from_64(depth_user, n, *ramps, ramps_full);
free(ramps_full);
return 0;
}
/**
* Set the gamma ramps for a CRTC, re-encoding version.
*
* @param this The CRTC state.
* @param ramps The gamma ramps to apply.
* @param depth_user The depth of the gamma ramps that are provided by the user,
* `-1` for `float`, `-2` for `double`.
* @param depth_system The depth of the gamma ramps as required by the adjustment method,
* `-1` for `float`, `-2` for `double`.
* @param fun Function that is to be used write the ramps, its parameters have
* the same function as those of this function with the same names,
* and the return value too is identical.
* @return Zero on success, otherwise (negative) the value of an
* error identifier provided by this library.
*/
int libgamma_translated_ramp_set_(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps_any_t ramps,
signed depth_user, signed depth_system,
libgamma_set_ramps_any_fun* fun)
{
size_t n;
int r;
libgamma_gamma_ramps_any_t ramps_sys;
uint64_t* restrict ramps_full;
/* Allocate ramps with proper data type. */
if ((r = allocated_any_ramp(&ramps_sys, ramps, depth_system, &n)))
return r;
/* Allocate intermediary ramps. */
if ((ramps_full = malloc(n * sizeof(uint64_t))) == NULL)
return free(ramps_sys.ANY.red), LIBGAMMA_ERRNO_SET;
/* Translate ramps to 64-bit integers. */
translate_to_64(depth_user, n, ramps_full, ramps);
/* Translate ramps to the proper format. */
translate_from_64(depth_system, n, ramps_sys, ramps_full);
free(ramps_full);
/* Apply the ramps */
r = fun(this, ramps_sys);
free(ramps_sys.ANY.red);
return r;
}
#undef __translate
#undef ANY
