自动曝光增加测光处理

app/src/main/cpp/camera2/ndkcamera.cpp

@@ -875,6 +875,19 @@ void NdkCamera::onCaptureCompleted(ACameraCaptureSession* session, ACaptureReque
 
     if (m_imagesCaptured == ~0)
     {
+        if (m_params.autoExposure != 0)
+        {
+            val = { 0 };
+            status = ACameraMetadata_getConstEntry(result, ACAMERA_CONTROL_AE_STATE, &val);
+            mResult.aeState = (status == ACAMERA_OK) ? val.data.u8[0] : ACAMERA_CONTROL_AE_STATE_INACTIVE;
+            if (mResult.aeState == ACAMERA_CONTROL_AE_STATE_PRECAPTURE)
+            {
+                uint8_t aePrecatureTrigger = ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER_START;
+                status = ACaptureRequest_setEntry_u8(capture_request, ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER, 1, &aePrecatureTrigger);
+                return;
+            }
+        }
+
         if (afSupported && (m_params.autoFocus != 0))
         {
             val = { 0 };
@@ -907,9 +920,7 @@ void NdkCamera::onCaptureCompleted(ACameraCaptureSession* session, ACaptureReque
         return;
     }
 
-    val = { 0 };
+
-    status = ACameraMetadata_getConstEntry(result, ACAMERA_CONTROL_AE_STATE, &val);
-    mResult.aeState = (status == ACAMERA_OK) ? val.data.u8[0] : ACAMERA_CONTROL_AE_STATE_INACTIVE;
 
     val = { 0 };
     status = ACameraMetadata_getConstEntry(result, ACAMERA_SENSOR_EXPOSURE_TIME, &val);