SnapdragonCamera: Limit preview size by capping display dimensions.

By capping the display panel dimensions, effectively limit the preview
size configured to backend. This will help in optimizing power and
bandwidth.

Properties to be configured :
camera.display.umax -> set it to the upper max of display panel size
camera.display.lmax -> set it to the lower max of display panel size

For example if the properties are set as below :
adb shell setprop camera.display.umax 1920x1080
adb shell setprop camera.display.lmax 1280x720
Then, in devices having display panel size >1080p, panel size will be
seen as 1080p. If its 1080p or lesser (but >=720p), limit it to next
allowed max which is 720p. For < 720p, there is no need to do any capping.
By capping the panel size, we are indirectly controlling the preview size
being chosen in getOptimalPreviewSize().

Change-Id: Ia9963467dbda7fb47d96a96a345f26a5e38a95a1

1 files changed, 33 insertions, 0 deletions

diff --git a/src/com/android/camera/util/CameraUtil.java b/src/com/android/camera/util/CameraUtil.java
index 50fd13933..9b728b642 100644
--- a/src/com/android/camera/util/CameraUtil.java
+++ b/src/com/android/camera/util/CameraUtil.java
@@ -52,6 +52,7 @@ import android.view.WindowManager;
 import android.view.animation.AlphaAnimation;
 import android.view.animation.Animation;
 import android.widget.Toast;
+import android.os.SystemProperties;
 
 import com.android.camera.CameraActivity;
 import com.android.camera.CameraDisabledException;
@@ -523,6 +524,38 @@ public class CameraUtil {
 
     private static Point getDefaultDisplaySize(Activity activity, Point size) {
         activity.getWindowManager().getDefaultDisplay().getSize(size);
+        //cap the display resolution given to getOptimalPreviewSize if the below properties
+        //are set. For example if the properties are set as below :
+        //adb shell setprop camera.display.umax 1920x1080
+        //adb shell setprop camera.display.lmax 1280x720
+        //Then, in devices having display panel size >1080p, panel size will be seen as 1080p.
+        //If its 1080p or lesser (but >=720p), limit it to next allowed max which is 720p.
+        //For < 720p, there is no need to do any capping.
+        //By capping the panel size, we are indirectly controlling the preview size being
+        //chosen in getOptimalPreviewSize().
+        String uMax = SystemProperties.get("camera.display.umax", "");
+        String lMax = SystemProperties.get("camera.display.lmax", "");
+        if ((uMax.length() > 0) && (lMax.length() > 0)) {
+            Log.v(TAG,"display uMax "+ uMax + " lMax " + lMax);
+            String uMaxArr[] = uMax.split("x", 2);
+            String lMaxArr[] = lMax.split("x", 2);
+            try {
+                int uMaxWidth = Integer.parseInt(uMaxArr[0]);
+                int uMaxHeight = Integer.parseInt(uMaxArr[1]);
+                int lMaxWidth = Integer.parseInt(lMaxArr[0]);
+                int lMaxHeight = Integer.parseInt(lMaxArr[1]);
+                int defaultDisplaySize = (size.x * size.y);
+                if (defaultDisplaySize > (uMaxWidth*uMaxHeight)) {
+                    size.set(uMaxWidth,uMaxHeight);
+                } else if (defaultDisplaySize >= (lMaxWidth*lMaxHeight)) {
+                    size.set(lMaxWidth,lMaxHeight);
+                } else {
+                    Log.v(TAG,"No need to cap display size");
+                }
+            } catch (Exception e) {
+                Log.e(TAG,"Invalid display properties");
+            }
+        }
         return size;
     }