src/data/dem.cpp

@@ -28,14 +28,14 @@
 #define SRTM_SIZE(samples) \
 	((samples) * (samples) * 2)
 
-static double interpolate(double dx, double dy, double p0, double p1, double p2,
-  double p3)
+static qreal interpolate(qreal dx, qreal dy, qreal p0, qreal p1, qreal p2,
+  qreal p3)
 {
-	return p0 * (1.0 - dx) * (1.0 - dy) + p1 * dx * (1.0 - dy)
-	  + p2 * dy * (1.0 - dx) + p3 * dx * dy;
+	return p0 * (1 - dx) * (1 - dy) + p1 * dx * (1 - dy) + p2 * dy * (1 - dx)
+	  + p3 * dx * dy;
 }
 
-static double value(int col, int row, int samples, const QByteArray *data)
+static qreal value(int col, int row, int samples, const QByteArray *data)
 {
 	int pos = ((samples - 1 - row) * samples + col) * 2;
 	qint16 val = qFromBigEndian(*((const qint16*)(data->constData() + pos)));
@@ -43,7 +43,7 @@ static double value(int col, int row, int samples, const QByteArray *data)
 	return (val == -32768) ? NAN : val;
 }
 
-static double height(const Coordinates &c, const QByteArray *data)
+static qreal height(const Coordinates &c, const QByteArray *data)
 {
 	int samples;
 
@@ -56,17 +56,17 @@ static double height(const Coordinates &c, const QByteArray *data)
 	else
 		return NAN;
 
-	double lat = (c.lat() - floor(c.lat())) * (samples - 1);
-	double lon = (c.lon() - floor(c.lon())) * (samples - 1);
-	int row = (int)lat;
-	int col = (int)lon;
+	int row = (int)((c.lat() - qFloor(c.lat())) * (samples - 1));
+	int col = (int)((c.lon() - qFloor(c.lon())) * (samples - 1));
+	qreal dx = ((c.lon() - qFloor(c.lon())) * (samples - 1)) - col;
+	qreal dy = ((c.lat() - qFloor(c.lat())) * (samples - 1)) - row;
 
-	double p0 = value(col, row, samples, data);
-	double p1 = value(col + 1, row, samples, data);
-	double p2 = value(col, row + 1, samples, data);
-	double p3 = value(col + 1, row + 1, samples, data);
+	qreal p0 = value(col, row, samples, data);
+	qreal p1 = value(col + 1, row, samples, data);
+	qreal p2 = value(col, row + 1, samples, data);
+	qreal p3 = value(col + 1, row + 1, samples, data);
 
-	return interpolate(lon - col, lat - row, p0, p1, p2, p3);
+	return interpolate(dx, dy, p0, p1, p2, p3);
 }
 
 QMutex DEM::_lock;
@@ -111,7 +111,7 @@ void DEM::clearCache()
 	_data.clear();
 }
 
-double DEM::elevation(const Coordinates &c)
+qreal DEM::elevation(const Coordinates &c)
 {
 	if (_dir.isEmpty())
 		return NAN;
@@ -127,7 +127,7 @@ double DEM::elevation(const Coordinates &c)
 		if (QFileInfo::exists(zn)) {
 			QZipReader zip(zn, QIODevice::ReadOnly);
 			ba = new QByteArray(zip.fileData(bn));
-			double ele = height(c, ba);
+			qreal ele = height(c, ba);
 			_data.insert(tile, ba, ba->size());
 			return ele;
 		} else {
@@ -139,7 +139,7 @@ double DEM::elevation(const Coordinates &c)
 				return NAN;
 			} else {
 				ba = new QByteArray(file.readAll());
-				double ele = height(c, ba);
+				qreal ele = height(c, ba);
 				_data.insert(tile, ba, ba->size());
 				return ele;
 			}

src/data/dem.h

@@ -37,7 +37,7 @@ public:
 	static void setDir(const QString &path);
 	static void clearCache();
 
-	static double elevation(const Coordinates &c);
+	static qreal elevation(const Coordinates &c);
 	static void lock() {_lock.lock();}
 	static void unlock() {_lock.unlock();}
 

src/map/IMG/rastertile.cpp

@@ -454,16 +454,11 @@ Matrix RasterTile::elevation() const
 	int top = _rect.top() - 1;
 	int bottom = _rect.bottom() + 1;
 
-	QVector<Coordinates> ll;
-	ll.reserve(m.w() * m.h());
+	DEM::lock();
 	for (int y = top; y <= bottom; y++) {
 		for (int x = left; x <= right; x++)
-			ll.append(xy2ll(QPointF(x, y)));
+			m.m(y - top, x - left) = DEM::elevation(xy2ll(QPointF(x, y)));
 	}
-
-	DEM::lock();
-	for (int i = 0; i < ll.size(); i++)
-		m.m(i) = DEM::elevation(ll.at(i));
 	DEM::unlock();
 
 	return m;

src/map/hillshading.cpp

@@ -81,14 +81,18 @@ QImage HillShading::render(const Matrix &m, quint8 alpha, double azimuth,
 			double L = (c.a1 - c.a2 * d.dzdx - c.a3 * d.dzdy)
 			  / sqrt(1.0 + d.dzdx * d.dzdx + d.dzdy * d.dzdy);
 
-			quint32 pixel;
-			if (std::isnan(L))
-				pixel = 0;
-			else {
-				quint8 val = (L < 0) ? 0 : L * alpha;
-				pixel = alpha<<24 | val<<16 | val<<8 | val;
+			quint8 a, val;
+			if (std::isnan(L)) {
+				a = 0;
+				val = 0;
+			} else {
+				if (L < 0)
+					L = 0;
+				val = L * alpha;
+				a = alpha;
 			}
 
+			quint32 pixel = a<<24 | val<<16 | val<<8 | val;
 			*(quint32*)(bits + (y - 1) * bpl + (x - 1) * 4) = pixel;
 		}
 	}

src/map/mapsforge/rastertile.cpp

@@ -480,16 +480,11 @@ Matrix RasterTile::elevation() const
 	int top = _rect.top() - 1;
 	int bottom = _rect.bottom() + 1;
 
-	QVector<Coordinates> ll;
-	ll.reserve(m.w() * m.h());
+	DEM::lock();
 	for (int y = top; y <= bottom; y++) {
 		for (int x = left; x <= right; x++)
-			ll.append(xy2ll(QPointF(x, y)));
+			m.m(y - top, x - left) = DEM::elevation(xy2ll(QPointF(x, y)));
 	}
-
-	DEM::lock();
-	for (int i = 0; i < ll.size(); i++)
-		m.m(i) = DEM::elevation(ll.at(i));
 	DEM::unlock();
 
 	return m;

src/map/matrix.h

@@ -13,7 +13,6 @@ public:
 
 	int h() const {return _h;}
 	int w() const {return _w;}
-	double &m(int n) {return _m[n];}
 	double &m(int i, int j) {return _m[_w * i + j];}
 	double const &m(int i, int j) const {return _m.at(_w * i + j);}