File indexing completed on 2024-04-21 14:46:47

 /*
     SPDX-FileCopyrightText: 2021 Hy Murveit <hy@murveit.com>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #pragma once
 
 #include <memory>
 #include <QObject>
 #include <QImage>
 #include "projections/projector.h"
 
 class TerrainLookup;
 
 class TerrainRenderer : public QObject
 {
         Q_OBJECT
     public:
         // Create an instance of TerrainRenderer. We only have one.
         static TerrainRenderer *Instance();
 
         // Render terrainImage according to the loaded image and the projection.
         bool render(uint16_t w, uint16_t h, QImage *terrainImage, const Projector *proj);
     signals:
 
     public slots:
 
     private:
         // Constructor is private. Only make it with Instance().
         TerrainRenderer();
 
         // Speed-up the image calculations by downsampling azimuth and altitude
         // computations of the pixels in the input view.
         void setupLookup(uint16_t w, uint16_t h, int sampling, const Projector *proj,
                          TerrainLookup *azLookup, TerrainLookup *altLookup);
 
         // Returns the pixel in sourceImage for the given coordinates.
         QRgb getPixel(double az, double alt) const;
 
         // Checks to see if we can use the old rendering.
         // If not, copies the view for the next call.
         bool sameView(const Projector *proj, bool forceRefresh);
 
         // This is the only instance we'll make.
         static TerrainRenderer * _terrainRenderer;
 
         // True if the terrain image is setup.
         bool initialized = false;
 
         // The terrain image projection.
         QImage sourceImage;
 
         // Save the input view and the computed image in case the image can be re-used.
         ViewParams savedViewParams;
         double savedAz, savedAlt;
         QImage savedImage;
 
         // Keep the parameters used to display the last image
         // to see if something's changed and we need to redisplay.
         QString sourceFilename;
         int terrainDownsampling = 0;
         bool terrainSkipSpeedup = false;
         bool terrainSmoothPixels = false;
         bool terrainTransparencySpeedup = false;
         bool terrainSourceCorrectAz = 0;
         bool terrainSourceCorrectAlt = 0;
 };