Respond to display configuration updates on Android

* java/org/gnu/emacs/EmacsNative.java
(sendConfigurationChanged): Declare function.

* java/org/gnu/emacs/EmacsSdk7FontDriver.java (Sdk7FontEntity)
(Sdk7FontObject): Do not access `metrics' field deleted from
`EmacsService'.

* java/org/gnu/emacs/EmacsService.java (EmacsService)
<metrics, resources>: Delete fields.
<dpiX, dpiY, dpiScaled>: New fields.
(onCreate): Adjust accordingly.  Record current display metrics
for subsequent comparison.
(onConfigurationChanged): New function.

* lisp/dynamic-setting.el (font-setting-change-default-font):
Enable on systems where font-get-system-font is not defined if
invoked with SET-FONT nil.

* src/android.c (sendConfigurationChanged): New function.

* src/androidgui.h (ANDROID_CONFIGURATION_CHANGED): New enumerator.
(struct android_configuration_changed): New structure.
(union android_event): Add `config' member.

* src/androidterm.c (handle_one_android_event): Handle
ANDROID_CONFIGURATION_CHANGED events.
(syms_of_androidterm): Define Qfont_render, and
Qdynamic_setting.  Provide the latter.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/android.c b/src/android.c
index 0be3e10dea4..5c78dbd9171 100644
--- a/src/android.c
+++ b/src/android.c
@@ -2819,6 +2819,25 @@ NATIVE_NAME (sendNotificationAction) (JNIEnv *env, jobject object,
   return event_serial;
 }
 
+JNIEXPORT jlong JNICALL
+NATIVE_NAME (sendConfigurationChanged) (JNIEnv *env, jobject object,
+                                        jfloat dpi_x, jfloat dpi_y,
+                                        jfloat dpi_scaled)
+{
+  JNI_STACK_ALIGNMENT_PROLOGUE;
+
+  union android_event event;
+
+  event.config.type = ANDROID_CONFIGURATION_CHANGED;
+  event.config.serial = ++event_serial;
+  event.config.window = ANDROID_NONE;
+  event.config.dpi_x = dpi_x;
+  event.config.dpi_y = dpi_y;
+  event.config.dpi_scaled = dpi_scaled;
+  android_write_event (&event);
+  return event_serial;
+}
+
 JNIEXPORT jboolean JNICALL
 NATIVE_NAME (shouldForwardMultimediaButtons) (JNIEnv *env,
                                               jobject object)