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Added DEM filtering (bluring)

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This commit is contained in:
Martin Tůma 2024-05-20 19:17:27 +02:00
parent 11677f5e35
commit 947d2d62b3
10 changed files with 165 additions and 27 deletions
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2
gpxsee.pro
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@ -139,6 +139,7 @@ HEADERS += src/common/config.h \
src/map/encjob.h \
src/map/encmap.h \
src/map/ENC/iso8211.h \
src/map/filter.h \
src/map/gemfmap.h \
src/map/gmifile.h \
src/map/oruxmap.h \
@ -356,6 +357,7 @@ SOURCES += src/main.cpp \
src/map/encatlas.cpp \
src/map/encmap.cpp \
src/map/ENC/iso8211.cpp \
src/map/filter.cpp \
src/map/gemfmap.cpp \
src/map/gmifile.cpp \
src/map/oruxmap.cpp \

22
src/map/IMG/rastertile.cpp
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@ -7,6 +7,7 @@
#include "map/bitmapline.h"
#include "map/rectd.h"
#include "map/hillshading.h"
#include "map/filter.h"
#include "style.h"
#include "lblfile.h"
#include "dem.h"
@ -28,6 +29,7 @@ using namespace IMG;
#define ROAD 0
#define WATER 1
#define BLUR_RADIUS 3
#define DELTA 0.05 /* DEM3 resolution in degrees */
static const QColor textColor(Qt::black);
@ -453,15 +455,15 @@ void RasterTile::fetchData(QList<MapData::Poly> &polygons,
_data->points(pointRectD.toRectC(_proj, 20), _zoom, &points);
}
MatrixD RasterTile::elevation() const
MatrixD RasterTile::elevation(int extend) const
{
MatrixD m(_rect.height() + 2, _rect.width() + 2);
MatrixD m(_rect.height() + 2 * extend, _rect.width() + 2 * extend);
QVector<Coordinates> ll;
int left = _rect.left() - 1;
int right = _rect.right() + 1;
int top = _rect.top() - 1;
int bottom = _rect.bottom() + 1;
int left = _rect.left() - extend;
int right = _rect.right() + extend;
int top = _rect.top() - extend;
int bottom = _rect.bottom() + extend;
ll.reserve(m.w() * m.h());
for (int y = top; y <= bottom; y++)
@ -496,9 +498,11 @@ MatrixD RasterTile::elevation() const
void RasterTile::drawHillShading(QPainter *painter) const
{
if (_hillShading && _zoom >= 18 && _zoom <= 24)
painter->drawImage(_rect.x(), _rect.y(),
HillShading::render(elevation()));
if (_hillShading && _zoom >= 18 && _zoom <= 24) {
MatrixD dem(Filter::blur(elevation(BLUR_RADIUS), BLUR_RADIUS));
QImage img(HillShading::render(dem, BLUR_RADIUS));
painter->drawImage(_rect.x(), _rect.y(), img);
}
}
void RasterTile::render()

2
src/map/IMG/rastertile.h
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@ -75,7 +75,7 @@ private:
const QFont *poiFont(Style::FontSize size = Style::Normal,
int zoom = -1, bool extended = false) const;
MatrixD elevation() const;
MatrixD elevation(int extend) const;
Projection _proj;
Transform _transform;

114
src/map/filter.cpp Normal file
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@ -0,0 +1,114 @@
#include <cmath>
#include "filter.h"
static QVector<int> boxesForGauss(double sigma, int n)
{
double wIdeal = sqrt((12 * sigma * sigma / n) + 1);
int wl = floor(wIdeal);
if (wl % 2 == 0)
wl--;
int wu = wl + 2;
double mIdeal = (12 * sigma*sigma - n * wl * wl - 4 * n * wl - 3 * n)
/ (-4 * wl - 4);
int m = round(mIdeal);
QVector<int> sizes(n);
for (int i = 0; i < n; i++)
sizes[i] = i < m ? wl : wu;
return sizes;
}
static void boxBlurH4(const MatrixD &src, MatrixD &dst, int r)
{
double iarr = 1.0 / (r + r + 1);
for (int i = 0; i < src.h(); i++) {
int ti = i * src.w(), li = ti, ri = ti + r;
double fv = src.at(ti);
double lv = src.at(ti + src.w() - 1);
double val = (r + 1) * fv;
for (int j = 0; j < r; j++)
val += src.at(ti + j);
for (int j = 0; j <= r; j++) {
val += src.at(ri++) - fv;
dst.at(ti++) = val * iarr;
}
for (int j = r + 1; j < src.w() - r; j++) {
val += src.at(ri++) - src.at(li++);
dst.at(ti++) = val * iarr;
}
for (int j = src.w() - r; j < src.w(); j++) {
val += lv - src.at(li++);
dst.at(ti++) = val * iarr;
}
}
}
static void boxBlurT4(const MatrixD &src, MatrixD &dst, int r)
{
double iarr = 1.0 / (r + r + 1);
for (int i = 0; i < src.w(); i++) {
int ti = i, li = ti, ri = ti + r * src.w();
double fv = src.at(ti);
double lv = src.at(ti + src.w() * (src.h() - 1));
double val = (r + 1) * fv;
for (int j = 0; j < r; j++)
val += src.at(ti + j * src.w());
for (int j = 0; j <= r; j++) {
val += src.at(ri) - fv;
dst.at(ti) = val * iarr;
ri += src.w(); ti += src.w();
}
for (int j = r + 1; j < src.h() - r; j++) {
val += src.at(ri) - src.at(li);
dst.at(ti) = val * iarr;
li += src.w(); ri += src.w(); ti += src.w();
}
for (int j = src.h() - r; j < src.h(); j++) {
val += lv - src.at(li);
dst.at(ti) = val * iarr;
li += src.w(); ti += src.w();
}
}
}
static void boxBlur4(MatrixD &src, MatrixD &dst, int r)
{
for (int i = 0; i < src.size(); i++)
dst.at(i) = src.at(i);
boxBlurH4(dst, src, r);
boxBlurT4(src, dst, r);
}
static void gaussBlur4(MatrixD &src, MatrixD &dst, int r)
{
QVector<int> bxs(boxesForGauss(r, 3));
boxBlur4(src, dst, (bxs.at(0) - 1) / 2);
boxBlur4(dst, src, (bxs.at(1) - 1) / 2);
boxBlur4(src, dst, (bxs.at(2) - 1) / 2);
}
MatrixD Filter::blur(const MatrixD &m, int radius)
{
MatrixD src(m);
MatrixD dst(m.h(), m.w());
for (int i = 0; i < m.size(); i++)
if (std::isnan(m.at(i)))
src.at(i) = -500;
gaussBlur4(src, dst, radius);
for (int i = 0; i < dst.size(); i++)
if (std::isnan(m.at(i)))
dst.at(i) = NAN;
return dst;
}

11
src/map/filter.h Normal file
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@ -0,0 +1,11 @@
#ifndef FILTER_H
#define FILTER_H
#include "matrix.h"
namespace Filter
{
MatrixD blur(const MatrixD &m, int radius);
}
#endif // FILTER_H

11
src/map/hillshading.cpp
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@ -59,10 +59,11 @@ static void getSubmatrix(int x, int y, const MatrixD &m, SubMatrix &sm)
sm.z9 = m.at(bottom, right);
}
QImage HillShading::render(const MatrixD &m, quint8 alpha, double z,
QImage HillShading::render(const MatrixD &m, int extend, quint8 alpha, double z,
double azimuth, double elevation)
{
QImage img(m.w() - 2, m.h() - 2, QImage::Format_ARGB32_Premultiplied);
QImage img(m.w() - 2 * extend, m.h() - 2 * extend,
QImage::Format_ARGB32_Premultiplied);
uchar *bits = img.bits();
int bpl = img.bytesPerLine();
@ -72,8 +73,8 @@ QImage HillShading::render(const MatrixD &m, quint8 alpha, double z,
getConstants(azimuth, elevation, c);
for (int y = 1; y < m.h() - 1; y++) {
for (int x = 1; x < m.w() - 1; x++) {
for (int y = extend; y < m.h() - extend; y++) {
for (int x = extend; x < m.w() - extend; x++) {
getSubmatrix(x, y, m, sm);
getDerivativesHorn(sm, z, d);
@ -89,7 +90,7 @@ QImage HillShading::render(const MatrixD &m, quint8 alpha, double z,
pixel = (alpha - val)<<24;
}
*(quint32*)(bits + (y - 1) * bpl + (x - 1) * 4) = pixel;
*(quint32*)(bits + (y - extend) * bpl + (x - extend) * 4) = pixel;
}
}

4
src/map/hillshading.h
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@ -7,8 +7,8 @@
class HillShading
{
public:
static QImage render(const MatrixD &m, quint8 alpha = 96, double z = 0.3,
double azimuth = 315, double elevation = 25);
static QImage render(const MatrixD &m, int extend, quint8 alpha = 96,
double z = 0.3, double azimuth = 315, double elevation = 25);
};
#endif // HILLSHADING_H

23
src/map/mapsforge/rastertile.cpp
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@ -4,6 +4,7 @@
#include "common/dem.h"
#include "map/rectd.h"
#include "map/hillshading.h"
#include "map/filter.h"
#include "rastertile.h"
using namespace Mapsforge;
@ -12,6 +13,8 @@ using namespace Mapsforge;
#define PATHS_EXTENT 20
#define SEARCH_EXTENT -0.5
#define BLUR_RADIUS 3
static double LIMIT = cos(deg2rad(170));
static qreal area(const QPainterPath &polygon)
@ -438,9 +441,11 @@ void RasterTile::drawPaths(QPainter *painter, const QList<MapData::Path> &paths,
painter->setBrush(ri->brush());
painter->drawEllipse(ll2xy(point->coordinates), radius, radius);
} else {
if (_hillShading)
painter->drawImage(_rect.x(), _rect.y(),
HillShading::render(elevation()));
if (_hillShading) {
MatrixD dem(Filter::blur(elevation(BLUR_RADIUS), BLUR_RADIUS));
QImage img(HillShading::render(dem, BLUR_RADIUS));
painter->drawImage(_rect.x(), _rect.y(), img);
}
}
}
}
@ -471,14 +476,14 @@ void RasterTile::fetchData(QList<MapData::Path> &paths,
_data->points(pointRectD.toRectC(_proj, 20), _zoom, &points);
}
MatrixD RasterTile::elevation() const
MatrixD RasterTile::elevation(int extend) const
{
MatrixD m(_rect.height() + 2, _rect.width() + 2);
MatrixD m(_rect.height() + 2 * extend, _rect.width() + 2 * extend);
int left = _rect.left() - 1;
int right = _rect.right() + 1;
int top = _rect.top() - 1;
int bottom = _rect.bottom() + 1;
int left = _rect.left() - extend;
int right = _rect.right() + extend;
int top = _rect.top() - extend;
int bottom = _rect.bottom() + extend;
QVector<Coordinates> ll;
ll.reserve(m.w() * m.h());

2
src/map/mapsforge/rastertile.h
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@ -215,7 +215,7 @@ private:
void drawPaths(QPainter *painter, const QList<MapData::Path> &paths,
const QList<MapData::Point> &points, QVector<PainterPath> &painterPaths);
MatrixD elevation() const;
MatrixD elevation(int extend) const;
Projection _proj;
Transform _transform;

1
src/map/matrix.h
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@ -15,6 +15,7 @@ public:
int h() const {return _h;}
int w() const {return _w;}
const T &at(int n) const {return _m.at(n);}
T &at(int n) {return _m[n];}
T &at(int i, int j) {return _m[_w * i + j];}
T const &at(int i, int j) const {return _m.at(_w * i + j);}