1 files changed, 14 insertions, 18 deletions

diff --git a/src/ui/window.c b/src/ui/window.c
index 60c1483d..79073baa 100644
--- a/src/ui/window.c
+++ b/src/ui/window.c
@@ -63,9 +63,6 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 #include "stb_image.h"
 #include "stb_image_resize.h"
 
-#include <stdlib.h>
-#include <string.h>
-
 static iWindow *theWindow_ = NULL;
 
 #if defined (iPlatformApple) || defined (iPlatformLinux)
@@ -1360,24 +1357,23 @@ static float pixelRatio_Window_(const iWindow *d) {
 #endif
 
 static float displayScale_Window_(const iWindow *d) {
-    char* LAGRANGE_OVERRIDE_DPI = getenv("LAGRANGE_OVERRIDE_DPI");
-
-    /* If LAGRANGE_OVERRIDE_DPI is not set, or is an empty string, ignore it. */
-    if ((LAGRANGE_OVERRIDE_DPI != NULL) && (strnlen(LAGRANGE_OVERRIDE_DPI, 1) > 0)) {
-        /* This if the user has set the env var, but it is not an int, atoi */
+    /* The environment variable LAGRANGE_OVERRIDE_DPI can be used to override the automatic
+       display DPI detection. If not set, or is an empty string, ignore it.
+       Note: the same value used for all displays. */
+    const char *LAGRANGE_OVERRIDE_DPI = getenv("LAGRANGE_OVERRIDE_DPI");
+    if (LAGRANGE_OVERRIDE_DPI && *LAGRANGE_OVERRIDE_DPI) {
+        /* If the user has set the env var, but it is not an int, atoi */
         /* will return 0, in which case we just guess and return 96 DPI.  */
-        int env_dpi = atoi(LAGRANGE_OVERRIDE_DPI);
-
-        if (env_dpi == 0) {
-            fprintf(stderr, "WARNING: failed to parse LAGRANGE_OVERRIDE_DPI='%s', ignoring it\n", LAGRANGE_OVERRIDE_DPI);
-            /* To avoid showing the window multiple times, overwrite
-             * LAGRANGE_OVERRIDE_DPI with the empty string. */
-            setenv("LAGRANGE_OVERRIDE_DPI", "", 1);
-        } else {
-            return ((float) env_dpi) / baseDPI_Window;
+        const int envDpi = atoi(LAGRANGE_OVERRIDE_DPI);
+        if (envDpi > 0) {
+            return ((float) envDpi) / baseDPI_Window;
         }
+        fprintf(stderr, "[Window] WARNING: failed to parse LAGRANGE_OVERRIDE_DPI='%s', "
+                "ignoring it\n", LAGRANGE_OVERRIDE_DPI);
+        /* To avoid showing the warning multiple times, overwrite
+         LAGRANGE_OVERRIDE_DPI with the empty string. */
+        setenv("LAGRANGE_OVERRIDE_DPI", "", 1);
     }
-
 #if defined (iPlatformApple)
     iUnused(d);
     /* Apple UI sizes are fixed and only scaled by pixel ratio. */