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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
*
* Copyright (C) 2013 Richard Hughes <richard@hughsie.com>
*
* Licensed under the GNU Lesser General Public License Version 2.1
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* SECTION:cd-icc-utils
* @short_description: Utilities for working with CdIcc objects
*
* Functions to do unusual things with profiles.
*/
#include "config.h"
#include <glib-object.h>
#include <lcms2.h>
#include "cd-icc-utils.h"
typedef struct {
guint idx;
cmsFloat32Number *data;
} CdIccUtilsGamutCheckHelper;
static cmsInt32Number
cd_icc_utils_get_coverage_sample_cb (const cmsFloat32Number in[],
cmsFloat32Number out[],
void *user_data)
{
CdIccUtilsGamutCheckHelper *helper = (CdIccUtilsGamutCheckHelper *) user_data;
helper->data[helper->idx++] = in[0];
helper->data[helper->idx++] = in[1];
helper->data[helper->idx++] = in[2];
return 1;
}
static gboolean
cd_icc_utils_get_coverage_calc (CdIcc *icc,
CdIcc *icc_reference,
gdouble *coverage,
GError **error)
{
const guint cube_size = 33;
cmsHPROFILE profile_null = NULL;
cmsHTRANSFORM transform = NULL;
cmsUInt32Number dimensions[] = { cube_size, cube_size, cube_size };
CdIccUtilsGamutCheckHelper helper;
gboolean ret = TRUE;
guint cnt = 0;
guint data_len = cube_size * cube_size * cube_size;
guint i;
g_autofree cmsFloat32Number *data = NULL;
g_autofree cmsUInt16Number *alarm_codes = NULL;
/* create a proofing transform with gamut check */
profile_null = cmsCreateNULLProfileTHR (cd_icc_get_context (icc));
transform = cmsCreateProofingTransformTHR (cd_icc_get_context (icc),
cd_icc_get_handle (icc),
TYPE_RGB_FLT,
profile_null,
TYPE_GRAY_FLT,
cd_icc_get_handle (icc_reference),
INTENT_ABSOLUTE_COLORIMETRIC,
INTENT_ABSOLUTE_COLORIMETRIC,
cmsFLAGS_GAMUTCHECK |
cmsFLAGS_SOFTPROOFING);
if (transform == NULL) {
ret = FALSE;
g_set_error (error,
CD_ICC_ERROR,
CD_ICC_ERROR_INVALID_COLORSPACE,
"Failed to setup transform for %s->%s",
cd_icc_get_filename (icc),
cd_icc_get_filename (icc_reference));
goto out;
}
/* set gamut alarm to 0xffff */
alarm_codes = g_new0 (cmsUInt16Number, cmsMAXCHANNELS);
alarm_codes[0] = 0xffff;
cmsSetAlarmCodes (alarm_codes);
/* slice profile in regular intervals */
data = g_new0 (cmsFloat32Number, data_len * 3);
helper.data = data;
helper.idx = 0;
ret = cmsSliceSpaceFloat (3, dimensions,
cd_icc_utils_get_coverage_sample_cb,
&helper);
if (!ret) {
g_set_error_literal (error,
CD_ICC_ERROR,
CD_ICC_ERROR_INTERNAL,
"Failed to slice data");
goto out;
}
/* transform each one of those nodes across the proofing transform */
cmsDoTransform (transform, helper.data, helper.data, data_len);
/* count the nodes that gives you zero and divide by total number */
for (i = 0; i < data_len; i++) {
if (helper.data[i] == 0.0)
cnt++;
}
/* success */
if (coverage != NULL)
*coverage = (gdouble) cnt / (gdouble) data_len;
out:
cmsCloseProfile (profile_null);
if (transform != NULL)
cmsDeleteTransform (transform);
return ret;
}
/**
* cd_icc_utils_get_coverage:
* @icc: The profile to test
* @icc_reference: The reference profile, e.g. sRGB
* @coverage: The coverage of @icc on @icc_reference
* @error: A #GError, or %NULL
*
* Gets the gamut coverage of two profiles where 0.5 would mean the gamut is
* half the size, and 2.0 would indicate the gamut is twice the size.
*
* Return value: TRUE for success
**/
gboolean
cd_icc_utils_get_coverage (CdIcc *icc,
CdIcc *icc_reference,
gdouble *coverage,
GError **error)
{
gdouble coverage_tmp;
/* first see if icc has a smaller gamut volume to the reference */
if (!cd_icc_utils_get_coverage_calc (icc,
icc_reference,
&coverage_tmp,
error))
return FALSE;
/* now try the other way around */
if (coverage_tmp >= 1.0f) {
if (!cd_icc_utils_get_coverage_calc (icc_reference,
icc,
&coverage_tmp,
error))
return FALSE;
coverage_tmp = 1 / coverage_tmp;
}
/* success */
if (coverage != NULL)
*coverage = coverage_tmp;
return TRUE;
}
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