diff --git a/library/include/modules/Screen.h b/library/include/modules/Screen.h
index b97c9fc77..673533f3e 100644
--- a/library/include/modules/Screen.h
+++ b/library/include/modules/Screen.h
@@ -298,7 +298,7 @@ namespace DFHack
 
         namespace Hooks {
             GUI_HOOK_DECLARE(get_tile, Pen, (int x, int y, bool map));
-            GUI_HOOK_DECLARE(set_tile, void, (const Pen &pen, int x, int y, bool map));
+            GUI_HOOK_DECLARE(set_tile, bool, (const Pen &pen, int x, int y, bool map));
         }
 
     }
diff --git a/library/modules/Screen.cpp b/library/modules/Screen.cpp
index f299797d2..0469859ea 100644
--- a/library/modules/Screen.cpp
+++ b/library/modules/Screen.cpp
@@ -95,8 +95,12 @@ bool Screen::inGraphicsMode()
     return init && init->display.flag.is_set(init_display_flags::USE_GRAPHICS);
 }
 
-static void doSetTile_default(const Pen &pen, int x, int y, bool map)
+static bool doSetTile_default(const Pen &pen, int x, int y, bool map)
 {
+    auto dim = Screen::getWindowSize();
+    if (x < 0 || x >= dim.x || y < 0 || y >= dim.y)
+        return false;
+
     int index = ((x * gps->dimy) + y);
     auto screen = gps->screen + index*4;
     screen[0] = uint8_t(pen.ch);
@@ -108,10 +112,12 @@ static void doSetTile_default(const Pen &pen, int x, int y, bool map)
     gps->screentexpos_grayscale[index] = (pen.tile_mode == Screen::Pen::TileColor);
     gps->screentexpos_cf[index] = pen.tile_fg;
     gps->screentexpos_cbr[index] = pen.tile_bg;
+
+    return true;
 }
 
 GUI_HOOK_DEFINE(Screen::Hooks::set_tile, doSetTile_default);
-static void doSetTile(const Pen &pen, int x, int y, bool map)
+static bool doSetTile(const Pen &pen, int x, int y, bool map)
 {
     GUI_HOOK_TOP(Screen::Hooks::set_tile)(pen, x, y, map);
 }
@@ -120,9 +126,6 @@ bool Screen::paintTile(const Pen &pen, int x, int y, bool map)
 {
     if (!gps || !pen.valid()) return false;
 
-    auto dim = getWindowSize();
-    if (x < 0 || x >= dim.x || y < 0 || y >= dim.y) return false;
-
     doSetTile(pen, x, y, map);
     return true;
 }
@@ -130,8 +133,14 @@ bool Screen::paintTile(const Pen &pen, int x, int y, bool map)
 static Pen doGetTile_default(int x, int y, bool map)
 {
     auto dim = Screen::getWindowSize();
+    if (x < 0 || x >= dim.x || y < 0 || y >= dim.y)
+        return Pen(0,0,0,-1);
+
     int index = x*dim.y + y;
     auto screen = gps->screen + index*4;
+    if (screen[3] & 0x80)
+        return Pen(0,0,0,-1);
+
     Pen pen(
         screen[0], screen[1], screen[2], screen[3]?true:false,
         gps->screentexpos[index]
@@ -164,15 +173,6 @@ Pen Screen::readTile(int x, int y, bool map)
 {
     if (!gps) return Pen(0,0,0,-1);
 
-    auto dim = getWindowSize();
-    if (x < 0 || x >= dim.x || y < 0 || y >= dim.y)
-        return Pen(0,0,0,-1);
-
-    int index = x*dim.y + y;
-    auto screen = gps->screen + index*4;
-    if (screen[3] & 0x80)
-        return Pen(0,0,0,-1);
-
     return doGetTile(x, y, map);
 }
 
diff --git a/plugins/devel/color-dfhack-text.cpp b/plugins/devel/color-dfhack-text.cpp
index d0db8e710..c80c3cd4d 100644
--- a/plugins/devel/color-dfhack-text.cpp
+++ b/plugins/devel/color-dfhack-text.cpp
@@ -19,9 +19,9 @@ struct {
     uint8_t tick;
 } config;
 
-void color_text_tile(const Screen::Pen &pen, int x, int y, bool map);
+bool color_text_tile(const Screen::Pen &pen, int x, int y, bool map);
 GUI_HOOK_CALLBACK(Screen::Hooks::set_tile, color_text_hook, color_text_tile);
-void color_text_tile(const Screen::Pen &pen, int x, int y, bool map)
+bool color_text_tile(const Screen::Pen &pen, int x, int y, bool map)
 {
     Screen::Pen pen2 = pen;
     uint8_t color = config.flicker ? config.tick % 8 : config.color;
@@ -40,24 +40,24 @@ void color_text_tile(const Screen::Pen &pen, int x, int y, bool map)
     return color_text_hook.next()(pen2, x, y, map);
 }
 
-void aaaaa_set_tile(const Screen::Pen &pen, int x, int y, bool map);
+bool aaaaa_set_tile(const Screen::Pen &pen, int x, int y, bool map);
 GUI_HOOK_CALLBACK(Screen::Hooks::set_tile, aaaaa_set_tile_hook, aaaaa_set_tile);
-void aaaaa_set_tile(const Screen::Pen &pen, int x, int y, bool map)
+bool aaaaa_set_tile(const Screen::Pen &pen, int x, int y, bool map)
 {
     Screen::Pen pen2 = pen;
     if ((pen.ch >= 'A' && pen.ch <= 'Z') || (pen.ch >= '0' && pen.ch <= '9'))
         pen2.ch = 'A';
     else if (pen.ch >= 'a' && pen.ch <= 'z')
         pen2.ch = 'a';
-    aaaaa_set_tile_hook.next()(pen2, x, y, map);
+    return aaaaa_set_tile_hook.next()(pen2, x, y, map);
 }
 
-void shift_set_tile(const Screen::Pen &pen, int x, int y, bool map);
+bool shift_set_tile(const Screen::Pen &pen, int x, int y, bool map);
 GUI_HOOK_CALLBACK(Screen::Hooks::set_tile, shift_set_tile_hook, shift_set_tile);
-void shift_set_tile(const Screen::Pen &pen, int x, int y, bool map)
+bool shift_set_tile(const Screen::Pen &pen, int x, int y, bool map)
 {
     x = (x + 1) % gps->dimx;
-    shift_set_tile_hook.next()(pen, x, y, map);
+    return shift_set_tile_hook.next()(pen, x, y, map);
 }
 
 DFhackCExport command_result plugin_enable (color_ostream &out, bool enable)