implement tap to focus

camera-viewfinder-compose/build.gradle

@@ -42,6 +42,9 @@ dependencies {
     implementation composeBom
     androidTestImplementation composeBom
 
+    // Compose - Material Design 3
+    implementation 'androidx.compose.material3:material3'
+
     // Compose - Testing
     androidTestImplementation "androidx.compose.ui:ui-test-junit4"
 

camera-viewfinder-compose/src/main/java/com/google/jetpackcamera/viewfinder/CameraPreview.kt

@@ -19,9 +19,7 @@ package com.google.jetpackcamera.viewfinder
 import android.graphics.Bitmap
 import android.util.Log
 import android.view.Surface
-import com.google.jetpackcamera.viewfinder.surface.CombinedSurface
-import com.google.jetpackcamera.viewfinder.surface.CombinedSurfaceEvent
-import com.google.jetpackcamera.viewfinder.surface.SurfaceType
+import android.view.View
 import androidx.camera.core.Preview.SurfaceProvider
 import androidx.camera.core.SurfaceRequest
 import androidx.camera.view.PreviewView.ImplementationMode
@@ -34,6 +32,9 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.Modifier
+import com.google.jetpackcamera.viewfinder.surface.CombinedSurface
+import com.google.jetpackcamera.viewfinder.surface.CombinedSurfaceEvent
+import com.google.jetpackcamera.viewfinder.surface.SurfaceType
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.asExecutor
 import kotlinx.coroutines.flow.mapNotNull
@@ -45,7 +46,8 @@ fun CameraPreview(
     modifier: Modifier,
     implementationMode: ImplementationMode = ImplementationMode.COMPATIBLE,
     onSurfaceProviderReady: (SurfaceProvider) -> Unit = {},
-    onRequestBitmapReady: (() -> Bitmap?) -> Unit
+    onRequestBitmapReady: (() -> Bitmap?) -> Unit,
+    setSurfaceView: (View) -> Unit
 ) {
     Log.d(TAG, "CameraPreview")
 
@@ -58,6 +60,7 @@ fun CameraPreview(
 
     PreviewSurface(
         surfaceRequest = surfaceRequest,
+        setView = setSurfaceView
     )
 
 }
@@ -68,6 +71,7 @@ fun PreviewSurface(
 //    onRequestBitmapReady: (() -> Bitmap?) -> Unit,
     type: SurfaceType = SurfaceType.TEXTURE_VIEW,
     implementationMode: ImplementationMode = ImplementationMode.COMPATIBLE,
+    setView: (View) -> Unit
 ) {
     Log.d(TAG, "PreviewSurface")
 
@@ -89,6 +93,7 @@ fun PreviewSurface(
     when (implementationMode) {
         ImplementationMode.PERFORMANCE -> TODO()
         ImplementationMode.COMPATIBLE -> CombinedSurface(
+            setView = setView,
             onSurfaceEvent = { event ->
                 surface = when (event) {
                     is CombinedSurfaceEvent.SurfaceAvailable -> {

camera-viewfinder-compose/src/main/java/com/google/jetpackcamera/viewfinder/surface/CombinedSurface.kt

@@ -19,6 +19,7 @@ package com.google.jetpackcamera.viewfinder.surface
 import android.graphics.Bitmap
 import android.util.Log
 import android.view.Surface
+import android.view.View
 import androidx.compose.runtime.Composable
 import com.google.jetpackcamera.viewfinder.surface.SurfaceType.*
 
@@ -29,6 +30,7 @@ fun CombinedSurface(
     onSurfaceEvent: (CombinedSurfaceEvent) -> Unit,
     onRequestBitmapReady: (() -> Bitmap?) -> Unit = {},
     type: SurfaceType = TEXTURE_VIEW,
+    setView: (View) -> Unit
 ) {
     Log.d(TAG, "PreviewTexture")
 
@@ -46,10 +48,12 @@ fun CombinedSurface(
                 is SurfaceHolderEvent.SurfaceChanged -> {
                     // TODO(yasith@)
                 }
+
             }
         }
 
         TEXTURE_VIEW -> Texture(
+
             {
                 when (it) {
                     is SurfaceTextureEvent.SurfaceTextureAvailable -> {
@@ -70,7 +74,8 @@ fun CombinedSurface(
                 }
                 true
             },
-            onRequestBitmapReady
+            onRequestBitmapReady,
+            setView = setView
         )
     }
 }

camera-viewfinder-compose/src/main/java/com/google/jetpackcamera/viewfinder/surface/Texture.kt

@@ -20,6 +20,7 @@ import android.graphics.Bitmap
 import android.graphics.SurfaceTexture
 import android.util.Log
 import android.view.TextureView
+import android.view.View
 import android.view.ViewGroup
 import android.widget.LinearLayout
 import androidx.compose.runtime.Composable
@@ -34,8 +35,9 @@ private const val TAG = "Texture"
 @Composable
 fun Texture(
     onSurfaceTextureEvent: (SurfaceTextureEvent) -> Boolean = { _ -> true },
-    onRequestBitmapReady: (() -> Bitmap?) -> Unit
-) {
+    onRequestBitmapReady: (() -> Bitmap?) -> Unit,
+    setView: (View) -> Unit,
+    ) {
     Log.d(TAG, "Texture")
 
     var textureView: TextureView? by remember { mutableStateOf(null) }
@@ -91,9 +93,11 @@ fun Texture(
             }
         }, update = {
             textureView = it
+            setView(textureView!!)
             onRequestBitmapReady { -> it.bitmap }
         }
     )
+
 }
 
 sealed interface SurfaceTextureEvent {

domain/camera/src/main/java/com/google/jetpackcamera/domain/camera/CameraUseCase.kt

@@ -16,6 +16,7 @@
 
 package com.google.jetpackcamera.domain.camera
 
+import android.view.Display
 import androidx.camera.core.Preview
 import com.google.jetpackcamera.settings.model.CameraAppSettings
 import com.google.jetpackcamera.settings.model.FlashModeStatus
@@ -51,8 +52,11 @@ interface CameraUseCase {
     fun setZoomScale(scale: Float): Float
 
     fun setFlashMode(flashModeStatus: FlashModeStatus)
+
     suspend fun flipCamera(isFrontFacing: Boolean)
 
+    fun tapToFocus(display: Display, surfaceWidth: Int, surfaceHeight: Int, x:Float, y:Float)
+
     companion object {
         const val INVALID_ZOOM_SCALE = -1f
     }

domain/camera/src/main/java/com/google/jetpackcamera/domain/camera/CameraXCameraUseCase.kt

@@ -21,9 +21,12 @@ import android.content.ContentValues
 import android.provider.MediaStore
 import android.util.Log
 import android.util.Rational
+import android.view.Display
 import androidx.camera.core.Camera
 import androidx.camera.core.CameraSelector
 import androidx.camera.core.CameraSelector.LensFacing
+import androidx.camera.core.DisplayOrientedMeteringPointFactory
+import androidx.camera.core.FocusMeteringAction
 import androidx.camera.core.ImageCapture
 import androidx.camera.core.ImageCaptureException
 import androidx.camera.core.ImageProxy
@@ -189,6 +192,29 @@ class CameraXCameraUseCase @Inject constructor(
         )
     }
 
+    override fun tapToFocus(
+        display: Display,
+        surfaceWidth: Int,
+        surfaceHeight: Int,
+        x: Float,
+        y: Float
+    ) {
+        if (camera != null) {
+            val meteringPoint = DisplayOrientedMeteringPointFactory(
+                display,
+                camera!!.cameraInfo,
+                surfaceWidth.toFloat(),
+                surfaceHeight.toFloat()
+            )
+                .createPoint(x, y);
+
+            val action = FocusMeteringAction.Builder(meteringPoint).build()
+
+            camera!!.cameraControl.startFocusAndMetering(action)
+            Log.d(TAG, "Tap to focus on: $meteringPoint")
+        }
+    }
+
     override fun setFlashMode(flashModeStatus: FlashModeStatus) {
         imageCaptureUseCase.flashMode = when (flashModeStatus) {
             FlashModeStatus.OFF -> ImageCapture.FLASH_MODE_OFF // 2

domain/camera/src/main/java/com/google/jetpackcamera/domain/camera/test/FakeCameraUseCase.kt

@@ -16,6 +16,7 @@
 
 package com.google.jetpackcamera.domain.camera.test
 
+import android.view.Display
 import androidx.camera.core.CameraSelector
 import androidx.camera.core.Preview
 import com.google.jetpackcamera.domain.camera.CameraUseCase
@@ -89,4 +90,14 @@ class FakeCameraUseCase : CameraUseCase {
     override suspend fun flipCamera(isFrontFacing: Boolean) {
         isLensFacingFront = isFrontFacing
     }
+
+    override fun tapToFocus(
+        display: Display,
+        surfaceWidth: Int,
+        surfaceHeight: Int,
+        x: Float,
+        y: Float
+    ) {
+        TODO("Not yet implemented")
+    }
 }

feature/preview/src/main/java/com/google/jetpackcamera/feature/preview/PreviewScreen.kt

@@ -19,6 +19,7 @@ package com.google.jetpackcamera.feature.preview
 import android.os.Handler
 import android.os.Looper
 import android.util.Log
+import android.view.View
 import androidx.camera.core.Preview.SurfaceProvider
 import androidx.compose.animation.core.animateFloatAsState
 import androidx.compose.animation.core.tween
@@ -48,6 +49,7 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
+import androidx.compose.ui.ExperimentalComposeUiApi
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.graphics.Color
@@ -69,6 +71,7 @@ private const val TAG = "PreviewScreen"
 /**
  * Screen used for the Preview feature.
  */
+@OptIn(ExperimentalComposeUiApi::class)
 @Composable
 fun PreviewScreen(
     onNavigateToSettings: () -> Unit,
@@ -85,6 +88,7 @@ fun PreviewScreen(
         Log.d(TAG, "onSurfaceProviderReady")
         deferredSurfaceProvider.complete(it)
     }
+    lateinit var viewInfo: View
     var zoomScale by remember { mutableStateOf(1f) }
     var zoomScaleShow by remember { mutableStateOf(false) }
     val zoomHandler = Handler(Looper.getMainLooper())
@@ -118,16 +122,33 @@ fun PreviewScreen(
                         onDoubleTap = { offset ->
                             Log.d(TAG, "onDoubleTap $offset")
                             viewModel.flipCamera()
+                        },
+                        onTap = { offset ->
+                            try {
+                                viewModel.tapToFocus(
+                                    viewInfo.display,
+                                    viewInfo.width,
+                                    viewInfo.height,
+                                    offset.x, offset.y
+                                )
+                                Log.d(TAG, "onTap $offset")
+                            } catch (e: UninitializedPropertyAccessException) {
+                                Log.d(TAG, "onTap $offset")
+                                e.printStackTrace()
+                            }
                         }
                     )
-                }
+                },
         ) {
             CameraPreview(
                 modifier = Modifier
                     .fillMaxSize(),
                 onSurfaceProviderReady = onSurfaceProviderReady,
                 onRequestBitmapReady = {
                     val bitmap = it.invoke()
+                },
+                setSurfaceView = { s: View ->
+                    viewInfo = s
                 }
             )
 

feature/preview/src/main/java/com/google/jetpackcamera/feature/preview/PreviewViewModel.kt

@@ -17,6 +17,7 @@
 package com.google.jetpackcamera.feature.preview
 
 import android.util.Log
+import android.view.Display
 import androidx.camera.core.ImageCaptureException
 import androidx.camera.core.Preview.SurfaceProvider
 import androidx.lifecycle.ViewModel
@@ -208,4 +209,14 @@ class PreviewViewModel @Inject constructor(
             )
         }
     }
+
+    fun tapToFocus(display: Display, surfaceWidth: Int, surfaceHeight: Int, x: Float, y: Float) {
+        cameraUseCase.tapToFocus(
+            display = display,
+            surfaceWidth = surfaceWidth,
+            surfaceHeight = surfaceHeight,
+            x = x,
+            y = y
+        )
+    }
 }