src/chart/common.h

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/*
 *    This file is part of darktable,
 *    Copyright (C) 2016 johannes hanika.
 *    Copyright (C) 2016, 2020 Tobias Ellinghaus.
 *    Copyright (C) 2020 Aurélien PIERRE.
 *    Copyright (C) 2020 Pascal Obry.
 *    Copyright (C) 2021 Sakari Kapanen.
 *    Copyright (C) 2022 Martin Bařinka.
 *    
 *    darktable 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.
 *    
 *    darktable 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 darktable.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include "chart/colorchart.h"
 
enum
{
  TOP_LEFT = 0,
  TOP_RIGHT = 1,
  BOTTOM_RIGHT = 2,
  BOTTOM_LEFT = 3
};
 
typedef struct image_t
{
  GtkWidget *drawing_area;
 
  cairo_surface_t *surface;
  cairo_pattern_t *image;
  int width, height;
  float *xyz;
  float scale;
  int offset_x, offset_y;
  float shrink;
 
  point_t bb[4];
 
  chart_t **chart;
  gboolean draw_colored;
} image_t;
 
int get_homography(const point_t *source, const point_t *target, float *h);
point_t apply_homography(point_t p, const float *h);
// Gives a factor of scaling areas at point p
float apply_homography_scaling(point_t p, const float *h);
 
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