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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the Chromium LICENSE file.
#include "qcmsint.h"
#include <math.h>
typedef struct _qcms_coords {
float x;
float y;
} qcms_coords;
typedef struct _qcms_triangle {
qcms_coords verticies[3];
} qcms_triangle;
#define NTSC_1953_GAMUT_SIZE 0.1582
static qcms_triangle get_profile_triangle(qcms_profile *profile)
{
float sumRed = s15Fixed16Number_to_float(profile->redColorant.X) +
s15Fixed16Number_to_float(profile->redColorant.Y) +
s15Fixed16Number_to_float(profile->redColorant.Z);
float xRed = s15Fixed16Number_to_float(profile->redColorant.X) / sumRed;
float yRed = s15Fixed16Number_to_float(profile->redColorant.Y) / sumRed;
float sumGreen = s15Fixed16Number_to_float(profile->greenColorant.X) +
s15Fixed16Number_to_float(profile->greenColorant.Y) +
s15Fixed16Number_to_float(profile->greenColorant.Z);
float xGreen = s15Fixed16Number_to_float(profile->greenColorant.X) / sumGreen;
float yGreen = s15Fixed16Number_to_float(profile->greenColorant.Y) / sumGreen;
float sumBlue = s15Fixed16Number_to_float(profile->blueColorant.X) +
s15Fixed16Number_to_float(profile->blueColorant.Y) +
s15Fixed16Number_to_float(profile->blueColorant.Z);
float xBlue = s15Fixed16Number_to_float(profile->blueColorant.X) / sumBlue;
float yBlue = s15Fixed16Number_to_float(profile->blueColorant.Y) / sumBlue;
qcms_triangle triangle = {{{xRed, yRed}, {xGreen, yGreen}, {xBlue, yBlue}}};
return triangle;
}
static float get_triangle_area(const qcms_triangle candidate)
{
float xRed = candidate.verticies[0].x;
float yRed = candidate.verticies[0].y;
float xGreen = candidate.verticies[1].x;
float yGreen = candidate.verticies[1].y;
float xBlue = candidate.verticies[2].x;
float yBlue = candidate.verticies[2].y;
float area = fabs((xRed - xBlue) * (yGreen - yBlue) - (xGreen - xBlue) * (yRed - yBlue)) / 2;
return area;
}
static float get_ntsc_gamut_metric_area(const qcms_triangle candidate)
{
float area = get_triangle_area(candidate);
return area * 100 / NTSC_1953_GAMUT_SIZE;
}
float qcms_profile_ntsc_relative_gamut_size(qcms_profile *profile)
{
qcms_triangle triangle = get_profile_triangle(profile);
return get_ntsc_gamut_metric_area(triangle);
}
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