Take auto perspective correction files from ART

rtengine/perspectivecorrection.h

@@ -0,0 +1,55 @@
+/* -*- C++ -*-
+ *
+ *  This file is part of RawTherapee.
+ *
+ *  Copyright (c) 2019 Alberto Griggio <alberto.griggio@gmail.com>
+ *
+ *  RawTherapee 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.
+ *
+ *  RawTherapee 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 RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "coord2d.h"
+#include "procparams.h"
+#include "imagesource.h"
+
+namespace rtengine {
+
+class PerspectiveCorrection {
+public:
+    PerspectiveCorrection();
+    void init(int width, int height, const procparams::PerspectiveParams &params, bool fill, const FramesMetaData *meta);
+    void operator()(double &x, double &y);
+
+    enum Direction {
+        HORIZONTAL,
+        VERTICAL,
+        BOTH
+    };
+    static procparams::PerspectiveParams autocompute(ImageSource *src, Direction dir, const procparams::ProcParams *pparams, const FramesMetaData *metadata);
+
+    static void autocrop(int width, int height, bool fixratio, const procparams::PerspectiveParams &params, const FramesMetaData *metadata, int &x, int &y, int &w, int &h);
+
+private:
+    void correct(double &x, double &y, double scale, double offx, double offy);
+    void calc_scale(int w, int h, const procparams::PerspectiveParams &params, bool fill);
+    
+    bool ok_;
+    double scale_;
+    double offx_;
+    double offy_;
+    float ihomograph_[3][3];
+};
+
+} // namespace rtengine