Add SDL_IsTablet() to Android and iOS SDL.

android-project/app/src/main/java/org/libsdl/app/SDLActivity.java

@@ -5,6 +5,7 @@ import java.io.InputStream;
 import java.util.Arrays;
 import java.util.Hashtable;
 import java.lang.reflect.Method;
+import java.lang.Math;
 
 import android.app.*;
 import android.content.*;
@@ -776,6 +777,23 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
         return false;
     }
 
+    /**
+     * This method is called by SDL using JNI.
+     */
+    public static boolean isTablet() {
+        DisplayMetrics metrics = new DisplayMetrics();
+        Activity sdlActivity = (Activity)getContext();
+        sdlActivity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
+
+        double dWidthInches = metrics.widthPixels / (double)metrics.densityDpi;
+        double dHeightInches = metrics.heightPixels / (double)metrics.densityDpi;
+
+        double dDiagonal = Math.sqrt((dWidthInches * dWidthInches) + (dHeightInches * dHeightInches));
+
+        // If our diagonal size is seven inches or greater, we consider ourselves a tablet.
+        return (dDiagonal > 7.0);
+    }
+
     /**
      * This method is called by SDL using JNI.
      */

include/SDL_system.h

@@ -174,6 +174,15 @@ extern DECLSPEC const char * SDLCALL SDL_AndroidGetExternalStoragePath(void);
 
 #endif /* __ANDROID__ */
 
+#if defined(__ANDROID__) || defined(__IPHONEOS__)
+
+/**
+ \brief Return true if the current device is a tablet.
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_IsTablet(void);
+
+#endif
+
 /* Platform specific functions for WinRT */
 #if defined(__WINRT__) && __WINRT__
 

src/core/android/SDL_android.c

@@ -232,6 +232,7 @@ static jmethodID midSetCustomCursor;
 static jmethodID midSetSystemCursor;
 static jmethodID midSupportsRelativeMouse;
 static jmethodID midSetRelativeMouseEnabled;
+static jmethodID midIsTablet;
 
 /* audio manager */
 static jclass mAudioManagerClass;
@@ -354,13 +355,15 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeSetupJNI)(JNIEnv* mEnv, jclass c
     midSupportsRelativeMouse = (*mEnv)->GetStaticMethodID(mEnv, mActivityClass, "supportsRelativeMouse", "()Z");
     midSetRelativeMouseEnabled = (*mEnv)->GetStaticMethodID(mEnv, mActivityClass, "setRelativeMouseEnabled", "(Z)Z");
 
+    midIsTablet = (*mEnv)->GetStaticMethodID(mEnv, mActivityClass, "isTablet", "()Z");
+
     if (!midGetNativeSurface ||
        !midSetActivityTitle || !midSetWindowStyle || !midSetOrientation || !midGetContext || !midIsAndroidTV || !midInputGetInputDeviceIds ||
        !midSendMessage || !midShowTextInput || !midIsScreenKeyboardShown ||
        !midClipboardSetText || !midClipboardGetText || !midClipboardHasText ||
        !midOpenAPKExpansionInputStream || !midGetManifestEnvironmentVariables || !midGetDisplayDPI ||
        !midCreateCustomCursor || !midSetCustomCursor || !midSetSystemCursor || !midSupportsRelativeMouse || !midSetRelativeMouseEnabled ||
-       !midIsChromebook || !midIsDeXMode || !midManualBackButton) {
+       !midIsChromebook || !midIsDeXMode || !midManualBackButton || !midIsTablet) {
         __android_log_print(ANDROID_LOG_WARN, "SDL", "Missing some Java callbacks, do you have the latest version of SDLActivity.java?");
     }
 
@@ -2048,6 +2051,12 @@ SDL_bool SDL_IsDeXMode(void)
     return (*env)->CallStaticBooleanMethod(env, mActivityClass, midIsDeXMode);
 }
 
+SDL_bool SDL_IsTablet(void)
+{
+    JNIEnv *env = Android_JNI_GetEnv();
+    return (*env)->CallStaticBooleanMethod(env, mActivityClass, midIsTablet);
+}
+
 void SDL_AndroidBackButton(void)
 {
     JNIEnv *env = Android_JNI_GetEnv();

src/dynapi/SDL_dynapi_overrides.h

@@ -680,3 +680,4 @@
 #define SDL_wcsdup SDL_wcsdup_REAL
 #define SDL_GameControllerRumble SDL_GameControllerRumble_REAL
 #define SDL_JoystickRumble SDL_JoystickRumble_REAL
+#define SDL_IsTablet SDL_IsTablet_REAL

src/dynapi/SDL_dynapi_procs.h

@@ -722,3 +722,6 @@ SDL_DYNAPI_PROC(float,SDL_expf,(float a),(a),return)
 SDL_DYNAPI_PROC(wchar_t*,SDL_wcsdup,(const wchar_t *a),(a),return)
 SDL_DYNAPI_PROC(int,SDL_GameControllerRumble,(SDL_GameController *a, Uint16 b, Uint16 c, Uint32 d),(a,b,c,d),return)
 SDL_DYNAPI_PROC(int,SDL_JoystickRumble,(SDL_Joystick *a, Uint16 b, Uint16 c, Uint32 d),(a,b,c,d),return)
+#if defined(__ANDROID__) || defined(__IPHONEOS__)
+SDL_DYNAPI_PROC(SDL_bool,SDL_IsTablet,(void),(),return)
+#endif

src/video/uikit/SDL_uikitvideo.m

@@ -233,6 +233,17 @@ void SDL_NSLog(const char *text)
     NSLog(@"%s", text);
 }
 
+/*
+ * iOS Tablet detection
+ *
+ * This doesn't really have aything to do with the interfaces of the SDL video
+ *  subsystem, but we need to stuff this into an Objective-C source code file.
+ */
+SDL_bool SDL_IsTablet(void)
+{
+    return (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad);
+}
+
 #endif /* SDL_VIDEO_DRIVER_UIKIT */
 
 /* vi: set ts=4 sw=4 expandtab: */