diff -r 2df4c896e30c include/SDL_video.h
--- a/include/SDL_video.h	Tue Jul 11 19:27:50 2017 -0700
+++ b/include/SDL_video.h	Wed Jul 12 12:45:25 2017 -0600
@@ -53,8 +53,8 @@
 typedef struct
 {
     Uint32 format;              /**< pixel format */
-    int w;                      /**< width, in screen coordinates */
-    int h;                      /**< height, in screen coordinates */
+    int w;                      /**< width, in pixels */
+    int h;                      /**< height, in pixels */
     int refresh_rate;           /**< refresh rate (or zero for unspecified) */
     void *driverdata;           /**< driver-specific data, initialize to 0 */
 } SDL_DisplayMode;
diff -r 2df4c896e30c src/video/cocoa/SDL_cocoamodes.m
--- a/src/video/cocoa/SDL_cocoamodes.m	Tue Jul 11 19:27:50 2017 -0700
+++ b/src/video/cocoa/SDL_cocoamodes.m	Wed Jul 12 12:45:25 2017 -0600
@@ -108,6 +108,7 @@
     int bpp = 0;
     int refreshRate = 0;
     CFStringRef fmt;
+    const SDL_bool macos10_8_or_later = floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_7;
 
     data = (SDL_DisplayModeData *) SDL_malloc(sizeof(*data));
     if (!data) {
@@ -116,8 +117,19 @@
     data->moderef = vidmode;
 
     fmt = CGDisplayModeCopyPixelEncoding(vidmode);
+
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= 1080
+    if (macos10_8_or_later) {
+        width = (int) CGDisplayModeGetPixelWidth(vidmode);
+        height = (int) CGDisplayModeGetPixelHeight(vidmode);
+    } else {
+        width = (int) CGDisplayModeGetWidth(vidmode);
+        height = (int) CGDisplayModeGetHeight(vidmode);
+    }
+#else
     width = (int) CGDisplayModeGetWidth(vidmode);
     height = (int) CGDisplayModeGetHeight(vidmode);
+#endif
     refreshRate = (int) (CGDisplayModeGetRefreshRate(vidmode) + 0.5);
 
     if (CFStringCompare(fmt, CFSTR(IO32BitDirectPixels),