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/*
* Copyright (C) 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.jetpackcamera.viewfinder
import android.graphics.Bitmap
import android.util.Log
import android.view.Surface
import android.view.View
import androidx.camera.core.Preview.SurfaceProvider
import androidx.camera.core.SurfaceRequest
import androidx.camera.view.PreviewView.ImplementationMode
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.produceState
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 kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.asExecutor
import kotlinx.coroutines.flow.mapNotNull
private const val TAG = "Preview"
@Composable
fun CameraPreview(
modifier: Modifier,
implementationMode: ImplementationMode = ImplementationMode.COMPATIBLE,
onSurfaceProviderReady: (SurfaceProvider) -> Unit = {},
onRequestBitmapReady: (() -> Bitmap?) -> Unit,
setSurfaceView: (View) -> Unit
) {
Log.d(TAG, "CameraPreview")
val surfaceRequest by produceState<SurfaceRequest?>(initialValue = null) {
onSurfaceProviderReady(
SurfaceProvider { request ->
value?.willNotProvideSurface()
value = request
}
)
}
PreviewSurface(
modifier = modifier,
surfaceRequest = surfaceRequest,
setView = setSurfaceView,
onRequestBitmapReady = onRequestBitmapReady,
implementationMode = implementationMode
)
}
@Composable
fun PreviewSurface(
modifier: Modifier,
surfaceRequest: SurfaceRequest?,
onRequestBitmapReady: (() -> Bitmap?) -> Unit,
implementationMode: ImplementationMode = ImplementationMode.COMPATIBLE,
setView: (View) -> Unit
) {
Log.d(TAG, "PreviewSurface")
var surface: Surface? by remember { mutableStateOf(null) }
LaunchedEffect(surfaceRequest, surface) {
Log.d(TAG, "LaunchedEffect")
snapshotFlow {
if (surfaceRequest == null || surface == null) {
null
} else {
Pair(surfaceRequest, surface)
}
}.mapNotNull { it }
.collect { (request, surface) ->
Log.d(TAG, "Collect: Providing surface")
request.provideSurface(surface!!, Dispatchers.Main.asExecutor()) {}
}
}
when (implementationMode) {
ImplementationMode.PERFORMANCE -> TODO()
ImplementationMode.COMPATIBLE ->
CombinedSurface(
modifier = modifier,
setView = setView,
onSurfaceEvent = { event ->
surface =
when (event) {
is CombinedSurfaceEvent.SurfaceAvailable -> {
event.surface
}
is CombinedSurfaceEvent.SurfaceDestroyed -> {
null
}
}
},
surfaceRequest = surfaceRequest,
onRequestBitmapReady = onRequestBitmapReady
)
}
}
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