Add fallback to get DisplayInfo

PR #3416 <https://github.com/Genymobile/scrcpy/pull/3416>

Signed-off-by: Romain Vimont <rom@rom1v.com>

server/src/main/java/com/genymobile/scrcpy/Command.java

@@ -30,4 +30,14 @@ public final class Command {
         }
         return result;
     }
+
+    public static String execReadOutput(String... cmd) throws IOException, InterruptedException {
+        Process process = Runtime.getRuntime().exec(cmd);
+        String output = IO.toString(process.getInputStream());
+        int exitCode = process.waitFor();
+        if (exitCode != 0) {
+            throw new IOException("Command " + Arrays.toString(cmd) + " returned with value " + exitCode);
+        }
+        return output;
+    }
 }

server/src/main/java/com/genymobile/scrcpy/IO.java

@@ -6,7 +6,9 @@ import android.system.OsConstants;
 
 import java.io.FileDescriptor;
 import java.io.IOException;
+import java.io.InputStream;
 import java.nio.ByteBuffer;
+import java.util.Scanner;
 
 public final class IO {
     private IO() {
@@ -37,4 +39,13 @@ public final class IO {
     public static void writeFully(FileDescriptor fd, byte[] buffer, int offset, int len) throws IOException {
         writeFully(fd, ByteBuffer.wrap(buffer, offset, len));
     }
+
+    public static String toString(InputStream inputStream) {
+        StringBuilder builder = new StringBuilder();
+        Scanner scanner = new Scanner(inputStream);
+        while (scanner.hasNextLine()) {
+            builder.append(scanner.nextLine()).append('\n');
+        }
+        return builder.toString();
+    }
 }

server/src/main/java/com/genymobile/scrcpy/wrappers/DisplayManager.java

@@ -1,8 +1,13 @@
 package com.genymobile.scrcpy.wrappers;
 
+import com.genymobile.scrcpy.Command;
 import com.genymobile.scrcpy.DisplayInfo;
+import com.genymobile.scrcpy.Ln;
 import com.genymobile.scrcpy.Size;
 
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 public final class DisplayManager {
     private final Object manager; // instance of hidden class android.hardware.display.DisplayManagerGlobal
 
@@ -10,11 +15,34 @@ public final class DisplayManager {
         this.manager = manager;
     }
 
+    private DisplayInfo parseDumpsysDisplay(int displayId) {
+        try {
+            String dumpDisplay = Command.execReadOutput("dumpsys", "display");
+            Pattern regex = Pattern.compile(
+                    "^    mBaseDisplayInfo=DisplayInfo\\{\".*\", displayId " + displayId + ".+, real ([0-9]+) x ([0-9]+).+, rotation ([0-9]+).*, " +
+                            "layerStack ([0-9]+).*");
+            Matcher m = regex.matcher(dumpDisplay);
+            if (!m.find()) {
+                return null;
+            }
+            int width = Integer.parseInt(m.group(1));
+            int height = Integer.parseInt(m.group(2));
+            int rotation = Integer.parseInt(m.group(3));
+            int layerStack = Integer.parseInt(m.group(4));
+            int flags = 0; // TODO
+            return new DisplayInfo(displayId, new Size(width, height), rotation, layerStack, flags);
+        } catch (Exception e) {
+            Ln.e("Could not get display info from \"dumpsys display\" output", e);
+            return null;
+        }
+    }
+
     public DisplayInfo getDisplayInfo(int displayId) {
         try {
             Object displayInfo = manager.getClass().getMethod("getDisplayInfo", int.class).invoke(manager, displayId);
             if (displayInfo == null) {
-                return null;
+                // fallback when displayInfo is null
+                return parseDumpsysDisplay(displayId);
             }
             Class<?> cls = displayInfo.getClass();
             // width and height already take the rotation into account