diff --git a/README.md b/README.md
index 92db8aa77c..3e60e633bd 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ Installing Panda3D
 ==================
 
 The latest Panda3D SDK can be downloaded from
-[this page](https://www.panda3d.org/download/sdk-1-10-7/).
+[this page](https://www.panda3d.org/download/sdk-1-10-8/).
 If you are familiar with installing Python packages, you can use
 the following command:
 
diff --git a/direct/src/extensions_native/NodePath_extensions.py b/direct/src/extensions_native/NodePath_extensions.py
index 6756819f47..ffb55daceb 100644
--- a/direct/src/extensions_native/NodePath_extensions.py
+++ b/direct/src/extensions_native/NodePath_extensions.py
@@ -789,6 +789,7 @@ def r_subdivideCollisions(self, solids, numSolidsInLeaves):
         return newSolids
 
 def r_constructCollisionTree(self, solidTree, parentNode, colName):
+        from panda3d.core import CollisionNode
         for item in solidTree:
             if type(item[0]) == type([]):
                 newNode = parentNode.attachNewNode('%s-branch' % colName)
diff --git a/direct/src/gui/OnscreenText.py b/direct/src/gui/OnscreenText.py
index cfdad68475..fbc487b3e6 100644
--- a/direct/src/gui/OnscreenText.py
+++ b/direct/src/gui/OnscreenText.py
@@ -294,6 +294,9 @@ class OnscreenText(NodePath):
     text = property(getText, setText)
 
     def setTextX(self, x):
+        """
+        .. versionadded:: 1.10.8
+        """
         self.setTextPos(x, self.__pos[1])
 
     def setX(self, x):
@@ -304,6 +307,9 @@ class OnscreenText(NodePath):
         self.setTextPos(x, self.__pos[1])
 
     def setTextY(self, y):
+        """
+        .. versionadded:: 1.10.8
+        """
         self.setTextPos(self.__pos[0], y)
 
     def setY(self, y):
@@ -316,6 +322,8 @@ class OnscreenText(NodePath):
     def setTextPos(self, x, y=None):
         """
         Position the onscreen text in 2d screen space
+
+        .. versionadded:: 1.10.8
         """
         if y is None:
             self.__pos = tuple(x)
@@ -324,6 +332,9 @@ class OnscreenText(NodePath):
         self.updateTransformMat()
 
     def getTextPos(self):
+        """
+        .. versionadded:: 1.10.8
+        """
         return self.__pos
 
     text_pos = property(getTextPos, setTextPos)
@@ -350,6 +361,8 @@ class OnscreenText(NodePath):
     def setTextR(self, r):
         """setTextR(self, float)
         Rotates the text around the screen's normal.
+
+        .. versionadded:: 1.10.8
         """
         self.__roll = -r
         self.updateTransformMat()
@@ -382,6 +395,8 @@ class OnscreenText(NodePath):
         """setTextScale(self, float, float)
         Scale the text in 2d space.  You may specify either a single
         uniform scale, or two scales, or a tuple of two scales.
+
+        .. versionadded:: 1.10.8
         """
 
         if sy is None:
@@ -394,6 +409,9 @@ class OnscreenText(NodePath):
         self.updateTransformMat()
 
     def getTextScale(self):
+        """
+        .. versionadded:: 1.10.8
+        """
         return self.__scale
 
     text_scale = property(getTextScale, setTextScale)
diff --git a/doc/ReleaseNotes b/doc/ReleaseNotes
index 83fe5b1bd5..392589b07c 100644
--- a/doc/ReleaseNotes
+++ b/doc/ReleaseNotes
@@ -10,6 +10,7 @@ Recommended maintenance release.
 * Fix sounds resuming on reactivation if stop() was called while inactive (#559)
 * Collision traverser now releases GIL during traversal (#1033)
 * Fix crash caused by some gamepad drivers on Linux (#1066)
+* Add GraphicsPipe::get_display_zoom() for querying system DPI scaling
 * Skinning-enabled shaders can now properly render unskinned models as well
 * BitMask, SparseArray, BitArray types can now be pickled (#886)
 * VFSImporter now properly detects source file encodings in Python 3
diff --git a/panda/src/display/config_display.cxx b/panda/src/display/config_display.cxx
index 23bbf44c9c..4ae956d50b 100644
--- a/panda/src/display/config_display.cxx
+++ b/panda/src/display/config_display.cxx
@@ -485,6 +485,14 @@ ConfigVariableBool sync_video
           "cheesy estimate of scene complexity.  Some drivers may ignore "
           "this request."));
 
+ConfigVariableDouble display_zoom
+("display-zoom", 0.0,
+ PRC_DESC("If this is set to a value other than 0.0, it overrides the detected "
+          "system DPI scaling.  GraphicsPipe::get_display_zoom() will instead "
+          "return whatever was passed in here.  You should generally only "
+          "change this based on a user preference change or to test how the UI "
+          "will look on monitors with different pixel densities."));
+
 /**
  * Initializes the library.  This must be called at least once before any of
  * the functions or classes in this library can be used.  Normally it will be
diff --git a/panda/src/display/config_display.h b/panda/src/display/config_display.h
index c425894389..c06d284674 100644
--- a/panda/src/display/config_display.h
+++ b/panda/src/display/config_display.h
@@ -109,6 +109,7 @@ extern EXPCL_PANDA_DISPLAY ConfigVariableDouble pixel_zoom;
 
 extern EXPCL_PANDA_DISPLAY ConfigVariableColor background_color;
 extern EXPCL_PANDA_DISPLAY ConfigVariableBool sync_video;
+extern EXPCL_PANDA_DISPLAY ConfigVariableDouble display_zoom;
 
 extern EXPCL_PANDA_DISPLAY void init_libdisplay();
 
diff --git a/panda/src/display/graphicsPipe.cxx b/panda/src/display/graphicsPipe.cxx
index 439e450b0a..39c09b76e8 100644
--- a/panda/src/display/graphicsPipe.cxx
+++ b/panda/src/display/graphicsPipe.cxx
@@ -97,6 +97,9 @@ static void update_memory_info(DisplayInformation *info) {
 }
 #endif
 
+// Temporarily declared as global float.
+static PN_stdfloat detected_display_zoom = 1.0;
+
 TypeHandle GraphicsPipe::_type_handle;
 
 /**
@@ -266,6 +269,35 @@ make_output(const std::string &name,
   return nullptr;
 }
 
+/**
+ * Returns the display zoom factor configured in the operating system.  If the
+ * operating system automatically scales windows to match the DPI (such as when
+ * dpi-aware is set to false), this will be 1.0.  Otherwise, this will be set to
+ * a value approximating the density of the monitor divided by the standard
+ * density of the operating system (usually 96), yielding a value like 1.5 or
+ * 2.0.
+ *
+ * @since 1.10.8
+ */
+PN_stdfloat GraphicsPipe::
+get_display_zoom() const {
+  if (display_zoom.get_num_words() > 0) {
+    double override = display_zoom.get_value();
+    if (override != 0.0) {
+      return override;
+    }
+  }
+  return detected_display_zoom;
+}
+
+/**
+ * Called by derived class to set the display zoom factor.
+ */
+void GraphicsPipe::
+set_detected_display_zoom(PN_stdfloat zoom) {
+  detected_display_zoom = zoom;
+}
+
 /**
  * Gets the pipe's DisplayInformation.
  */
diff --git a/panda/src/display/graphicsPipe.h b/panda/src/display/graphicsPipe.h
index ef3a3b8496..156467f66a 100644
--- a/panda/src/display/graphicsPipe.h
+++ b/panda/src/display/graphicsPipe.h
@@ -91,8 +91,10 @@ PUBLISHED:
 
   INLINE int get_display_width() const;
   INLINE int get_display_height() const;
+  PN_stdfloat get_display_zoom() const;
   MAKE_PROPERTY(display_width, get_display_width);
   MAKE_PROPERTY(display_height, get_display_height);
+  MAKE_PROPERTY(display_zoom, get_display_zoom);
 
   DisplayInformation *get_display_information();
   MAKE_PROPERTY(display_information, get_display_information);
@@ -115,6 +117,8 @@ public:
   virtual PT(GraphicsStateGuardian) make_callback_gsg(GraphicsEngine *engine);
 
 protected:
+  void set_detected_display_zoom(PN_stdfloat zoom);
+
   virtual void close_gsg(GraphicsStateGuardian *gsg);
 
   virtual PT(GraphicsOutput) make_output(const std::string &name,
diff --git a/panda/src/ffmpeg/ffmpegAudioCursor.cxx b/panda/src/ffmpeg/ffmpegAudioCursor.cxx
index af66ef28d4..455d79d4cc 100644
--- a/panda/src/ffmpeg/ffmpegAudioCursor.cxx
+++ b/panda/src/ffmpeg/ffmpegAudioCursor.cxx
@@ -224,7 +224,7 @@ cleanup() {
 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 52, 0)
     avcodec_free_context(&_audio_ctx);
 #else
-    delete _audio_ctx;
+    av_free(_audio_ctx);
 #endif
   }
   _audio_ctx = nullptr;
diff --git a/panda/src/ffmpeg/ffmpegVideoCursor.cxx b/panda/src/ffmpeg/ffmpegVideoCursor.cxx
index 8b700d2342..3305368a42 100644
--- a/panda/src/ffmpeg/ffmpegVideoCursor.cxx
+++ b/panda/src/ffmpeg/ffmpegVideoCursor.cxx
@@ -616,7 +616,7 @@ close_stream() {
 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 52, 0)
     avcodec_free_context(&_video_ctx);
 #else
-    delete _video_ctx;
+    av_free(_video_ctx);
 #endif
   }
   _video_ctx = nullptr;
diff --git a/panda/src/windisplay/winGraphicsPipe.cxx b/panda/src/windisplay/winGraphicsPipe.cxx
index ece0559426..4815262a77 100644
--- a/panda/src/windisplay/winGraphicsPipe.cxx
+++ b/panda/src/windisplay/winGraphicsPipe.cxx
@@ -227,6 +227,22 @@ WinGraphicsPipe() {
           windisplay_cat.debug() << "Calling SetProcessDpiAwareness().\n";
         }
         pfnSetProcessDpiAwareness(Process_Per_Monitor_DPI_Aware);
+
+        HDC dc = GetDC(nullptr);
+        if (dc) {
+          int dpi = GetDeviceCaps(dc, LOGPIXELSX);
+          if (dpi > 0) {
+            PN_stdfloat zoom = (double)dpi / 96.0;
+            set_detected_display_zoom(zoom);
+
+            if (windisplay_cat.is_debug()) {
+              windisplay_cat.debug()
+                << "Determined display zoom to be " << zoom
+                << " based on LOGPIXELSX " << dpi << "\n";
+            }
+          }
+          ReleaseDC(nullptr, dc);
+        }
       }
     }
   }
diff --git a/panda/src/x11display/x11GraphicsPipe.cxx b/panda/src/x11display/x11GraphicsPipe.cxx
index 3e095d0833..b181318861 100644
--- a/panda/src/x11display/x11GraphicsPipe.cxx
+++ b/panda/src/x11display/x11GraphicsPipe.cxx
@@ -16,6 +16,7 @@
 #include "config_x11display.h"
 #include "frameBufferProperties.h"
 #include "displayInformation.h"
+#include "pstrtod.h"
 
 #include <dlfcn.h>
 
@@ -350,6 +351,29 @@ x11GraphicsPipe(const std::string &display) :
     setlocale(LC_ALL, saved_locale.c_str());
   }
 
+  const char *dpi = XGetDefault(_display, "Xft", "dpi");
+  if (dpi != nullptr) {
+    char *endptr = nullptr;
+    double result = pstrtod(dpi, &endptr);
+    if (result != 0 && !cnan(result) && endptr[0] == '\0') {
+      result /= 96;
+      set_detected_display_zoom(result);
+
+      if (x11display_cat.is_debug()) {
+        x11display_cat.debug()
+          << "Determined display zoom to be " << result
+          << " based on specified Xft.dpi " << dpi << "\n";
+      }
+    } else {
+      x11display_cat.warning()
+        << "Unable to determine display zoom because Xft.dpi is invalid: "
+        << dpi << "\n";
+    }
+  } else if (x11display_cat.is_debug()) {
+    x11display_cat.debug()
+      << "Unable to determine display zoom because Xft.dpi was not set.\n";
+  }
+
   // Get some X atom numbers.
   _wm_delete_window = XInternAtom(_display, "WM_DELETE_WINDOW", false);
   _net_wm_pid = XInternAtom(_display, "_NET_WM_PID", false);
diff --git a/pandatool/src/deploy-stub/deploy-stub.c b/pandatool/src/deploy-stub/deploy-stub.c
index 65a604fa01..2565760d06 100644
--- a/pandatool/src/deploy-stub/deploy-stub.c
+++ b/pandatool/src/deploy-stub/deploy-stub.c
@@ -321,15 +321,20 @@ static int enable_line_buffering(PyObject *file) {
   if (method != NULL) {
     PyObject *result = PyObject_Call(method, args, kwargs);
     Py_DECREF(method);
+    Py_DECREF(kwargs);
+    Py_DECREF(args);
     if (result != NULL) {
       Py_DECREF(result);
     } else {
       PyErr_Clear();
       return 0;
     }
+  } else {
+    Py_DECREF(kwargs);
+    Py_DECREF(args);
+    PyErr_Clear();
+    return 0;
   }
-  Py_DECREF(kwargs);
-  Py_DECREF(args);
 #else
   /* Older versions just don't expose a way to reconfigure(), but it's still
      safe to override the property; we just have to use a hack to do it,