diff --git a/docs/dev/Lua API.rst b/docs/dev/Lua API.rst
index 0fa95dd03..7c6e72f19 100644
--- a/docs/dev/Lua API.rst	
+++ b/docs/dev/Lua API.rst	
@@ -1121,7 +1121,8 @@ Other
 * ``dfhack.gui.getDepthAt(x, y)``
 
   Returns the distance from the z-level of the tile at map coordinates (x, y) to
-  the closest ground z-level below. Defaults to 0, unless overridden by plugins.
+  the closest rendered ground z-level below. Defaults to 0, unless overridden by
+  plugins.
 
 Job module
 ----------
@@ -2161,7 +2162,14 @@ Functions:
 
 * ``dfhack.screen.getMousePos()``
 
-  Returns *x,y* of the tile the mouse is over.
+  Returns *x,y* of the UI interface tile the mouse is over, with the upper left
+  corner being ``0,0``. To get the map tile coordinate that the mouse is over,
+  see ``dfhack.gui.getMousePos()``.
+
+* ``dfhack.screen.getMousePixels()``
+
+  Returns *x,y* of the screen coordinates the mouse is over in pixels, with the
+  upper left corner being ``0,0``.
 
 * ``dfhack.screen.inGraphicsMode()``
 
@@ -3632,11 +3640,6 @@ considered stable.
 Misc
 ----
 
-* ``USE_GRAPHICS``
-
-  Contains the value of ``dfhack.screen.inGraphicsMode()``, which cannot be
-  changed without restarting the game and thus is constant during the session.
-
 * ``CLEAR_PEN``
 
   The black pen used to clear the screen.
diff --git a/library/LuaApi.cpp b/library/LuaApi.cpp
index ef0b5c3dd..31a6ee753 100644
--- a/library/LuaApi.cpp
+++ b/library/LuaApi.cpp
@@ -2373,6 +2373,11 @@ static int screen_getMousePos(lua_State *L)
     return Lua::PushPosXY(L, Screen::getMousePos());
 }
 
+static int screen_getMousePixels(lua_State *L)
+{
+    return Lua::PushPosXY(L, Screen::getMousePixels());
+}
+
 static int screen_getWindowSize(lua_State *L)
 {
     return Lua::PushPosXY(L, Screen::getWindowSize());
@@ -2563,6 +2568,7 @@ static int screen_zoom(lua_State *L)
 
 static const luaL_Reg dfhack_screen_funcs[] = {
     { "getMousePos", screen_getMousePos },
+    { "getMousePixels", screen_getMousePixels },
     { "getWindowSize", screen_getWindowSize },
     { "paintTile", screen_paintTile },
     { "readTile", screen_readTile },
diff --git a/library/lua/gui.lua b/library/lua/gui.lua
index 709ff65f9..1eaa9861a 100644
--- a/library/lua/gui.lua
+++ b/library/lua/gui.lua
@@ -7,8 +7,6 @@ local utils = require('utils')
 local dscreen = dfhack.screen
 local getval = utils.getval
 
-USE_GRAPHICS = dscreen.inGraphicsMode()
-
 local to_pen = dfhack.pen.parse
 
 CLEAR_PEN = to_pen{tile=909, ch=32, fg=0, bg=0}
diff --git a/library/lua/gui/widgets.lua b/library/lua/gui/widgets.lua
index 9ce42f2b2..55d8facf9 100644
--- a/library/lua/gui/widgets.lua
+++ b/library/lua/gui/widgets.lua
@@ -988,7 +988,7 @@ function render_text(obj,dc,x0,y0,pen,dpen,disabled)
             if token.tile then
                 x = x + 1
                 if dc then
-                    dc:char(nil, token.tile)
+                    dc:tile(nil, token.tile)
                 end
             end
 
diff --git a/library/modules/Gui.cpp b/library/modules/Gui.cpp
index 4b600a661..c436a0ca5 100644
--- a/library/modules/Gui.cpp
+++ b/library/modules/Gui.cpp
@@ -61,6 +61,7 @@ using namespace DFHack;
 #include "df/general_ref.h"
 #include "df/global_objects.h"
 #include "df/graphic.h"
+#include "df/graphic_viewportst.h"
 #include "df/historical_figure.h"
 #include "df/interfacest.h"
 #include "df/item_corpsepiecest.h"
@@ -2151,16 +2152,31 @@ df::coord Gui::getMousePos()
     df::coord pos;
     if (gps && gps->precise_mouse_x > -1) {
         pos = getViewportPos();
-/* TODO: understand how this changes for v50
-        pos.x += gps->mouse_x_pixel / tile_width;
-        pos.y += gps->mouse_y_pixel / tile_height;
-*/
+        if (Screen::inGraphicsMode()) {
+            int32_t map_tile_pixels = gps->viewport_zoom_factor / 4;
+            pos.x += gps->precise_mouse_x / map_tile_pixels;
+            pos.y += gps->precise_mouse_y / map_tile_pixels;
+        } else {
+            pos.x += gps->mouse_x;
+            pos.y += gps->mouse_y;
+        }
     }
+    if (!Maps::isValidTilePos(pos.x, pos.y, pos.z))
+        return df::coord();
     return pos;
 }
 
 int getDepthAt_default (int32_t x, int32_t y)
 {
+    auto &main_vp = gps->main_viewport;
+    if (x < 0 || x >= main_vp->dim_x || y < 0 || y >= main_vp->dim_y)
+        return 0;
+    const size_t num_viewports = gps->viewport.size();
+    const size_t index = (x * main_vp->dim_y) + y;
+    for (size_t depth = 0; depth < num_viewports; ++depth) {
+        if (gps->viewport[depth]->screentexpos_background[index])
+            return depth;
+    }
     return 0;
 }