Add option to change X11 scaling filter

hgx11.cpp

@@ -8,6 +8,7 @@ hgx11::hgx11(QHash<QString, QString> opts)
     unsigned short port = 19444;
     unsigned short scale = 8;
     unsigned short frameskip = 0;
+    const char * filter = FilterNearest;
     QString redAdjust = "", greenAdjust = "", blueAdjust = "";
     QString temperature = "", threshold = "", transform = "";
     QHashIterator<QString, QString> i(opts);
@@ -37,6 +38,21 @@ hgx11::hgx11(QHash<QString, QString> opts)
             threshold = _parseColorArr(i.value(), 0);
         } else if ((i.key() == "l" || i.key() == "transform") && _parseColorArr(i.value(), 0) != "") {
             transform = i.value();
+        } else if ((i.key() == "x" || i.key() == "filter") && i.value().toInt()) {
+            switch (i.value().toInt()) {
+                case 1:
+                    filter = FilterBilinear;
+                    break;
+                case 2:
+                    filter = FilterFast;
+                    break;
+                case 3:
+                    filter = FilterGood;
+                    break;
+                case 4:
+                    filter = FilterBest;
+                    break;
+            }
         }
     }
 
@@ -46,7 +62,7 @@ hgx11::hgx11(QHash<QString, QString> opts)
         return;
     }
 
-    _grabber_p = new hgx11grab(_display_p, scale);
+    _grabber_p = new hgx11grab(_display_p, scale, filter);
     _hclient_p = new hgx11net(addr, port);
     _damage_p = new hgx11damage(&_grabbed_m, frameskip);
     if (_inactiveXss_m) {

hgx11grab.cpp

@@ -2,8 +2,9 @@
 
 // public
 
-hgx11grab::hgx11grab(Display *display, unsigned short scaleDivisor)
+hgx11grab::hgx11grab(Display *display, unsigned short scaleDivisor, const char *filter)
 {
+    _filter_p = filter;
     _display_p = display;
 
     if (!XShmQueryExtension(_display_p)) {
@@ -140,7 +141,7 @@ void hgx11grab::grabFrame()
     _srcPicture_m = XRenderCreatePicture(_display_p, _window_m, _srcFormat_p, CPRepeat, &_pictAttr_m);
     _dstPicture_m = XRenderCreatePicture(_display_p, _pixmap_m, _dstFormat_p, CPRepeat, &_pictAttr_m);
 
-    XRenderSetPictureFilter(_display_p, _srcPicture_m, FilterFast, nullptr, 0);
+    XRenderSetPictureFilter(_display_p, _srcPicture_m, _filter_p, nullptr, 0);
     XRenderSetPictureTransform(_display_p, _srcPicture_m, &_mTransform_m);
 
     XRenderComposite(

hgx11grab.h

@@ -14,7 +14,7 @@ class hgx11grab : public QObject
 public:
     QString imgdata_m;
 
-    hgx11grab(Display *, unsigned short);
+    hgx11grab(Display *, unsigned short, const char *);
     ~hgx11grab();
 
     int getDest_width() const;
@@ -40,6 +40,7 @@ private:
     int _imgSize_m;
     double _scale_m;
     bool _freed_m = 0;
+    const char *_filter_p;
 
     bool _getWinAttr();
     void _freeResources();

main.cpp

@@ -86,6 +86,11 @@ int main(int argc, char *argv[])
         QCoreApplication::translate("main", "adjusts luminance / saturation")
     );
     parser.addOption(transform);
+    QCommandLineOption filter(QStringList() << "x" << "scalefilter",
+        QCoreApplication::translate("main", "X11 scaling filter to use (see X11's render.h). 0 nearest (default), 1 bilinear, 2 fast, 3 good, 4 best"),
+        QCoreApplication::translate("main", "X11 scaling filter")
+    );
+    parser.addOption(filter);
     parser.process(*qapp);
 
     if (!parser.isSet("address")) {