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MayuriKhinvasarayrezgui
MayuriKhinvasara
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yrezgui
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[Sample] [Graphics] [Compose] UltraHDR image rendering in Compose. (#89)
* Render an UltraHDR image in Compose. Added two views (ImageView (Regular android view)) and Image (Compose)) to display functionality and support of rendering an ultrahdr. * (1) Loading asset and image decoding on a background thread (2) Add activity color mode controls for hdr and sdr (3) Remove fragment class and use the Sample annotation (4) Resolve minor readability comments * Removed dependencies which are not required * Update DisplayUltraHDRScreen logic to be Compose friendly (#116) * Update DisplayUltraHDRScreen logic to be Compose friendly * Add ImageView below to Compose Image composable Fetch colorMode details when screen is rendered * Update README.md --------- Co-authored-by: Yacine Rezgui <rezgui.y@gmail.com>
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‎samples/README.md‎

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This sample demonstrates displaying an UltraHDR image.
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- [Displaying UltraHDR (3P Libraries)](graphics/ultrahdr/src/main/java/com/example/platform/graphics/ultrahdr/display/DisplayingUltraHDRUsing3PLibrary.kt):
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This sample demonstrates using the various popular image loading library to
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- [Displaying UltraHDR (Compose)](graphics/ultrahdr/src/main/java/com/example/platform/graphics/ultrahdr/display/DisplayUltraHDRScreen.kt):
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This sample demonstrates displaying an UltraHDR image in a Compose View and an Android View
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- [Downloadable Fonts](user-interface/text/src/main/java/com/example/platform/ui/text/DownloadableFonts.kt):
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Download fonts instead of bundling them in the app resources.
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- [Drag and Drop](user-interface/draganddrop/src/main/java/com/example/platform/ui/draganddrop/DragAndDrop.kt):

‎samples/graphics/ultrahdr/src/main/java/com/example/platform/graphics/ultrahdr/display/DisplayUltraHDRScreen.kt‎

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/*
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* Copyright 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.platform.graphics.ultrahdr.display
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import android.app.Activity
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import android.content.Context
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import android.content.ContextWrapper
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import android.content.pm.ActivityInfo
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import android.graphics.Bitmap
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import android.graphics.BitmapFactory
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import android.os.Build
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import android.util.Log
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import android.view.Display
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import android.view.Window
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import android.widget.ImageView
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import androidx.annotation.RequiresApi
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import androidx.compose.foundation.Image
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import androidx.compose.foundation.layout.Arrangement
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import androidx.compose.foundation.layout.Column
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import androidx.compose.foundation.layout.Row
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import androidx.compose.foundation.layout.Spacer
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import androidx.compose.foundation.layout.fillMaxWidth
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import androidx.compose.foundation.layout.padding
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import androidx.compose.foundation.layout.width
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import androidx.compose.material3.Button
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import androidx.compose.material3.Divider
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import androidx.compose.material3.MaterialTheme
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import androidx.compose.material3.Text
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.DisposableEffect
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import androidx.compose.runtime.LaunchedEffect
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import androidx.compose.runtime.getValue
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import androidx.compose.runtime.mutableStateOf
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import androidx.compose.runtime.remember
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import androidx.compose.runtime.setValue
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import androidx.compose.ui.Alignment
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.graphics.asImageBitmap
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import androidx.compose.ui.platform.LocalContext
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import androidx.compose.ui.platform.LocalView
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import androidx.compose.ui.res.dimensionResource
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import androidx.compose.ui.res.stringResource
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import androidx.compose.ui.unit.dp
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import androidx.compose.ui.viewinterop.AndroidView
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import androidx.compose.ui.window.DialogWindowProvider
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import com.example.platform.graphics.ultrahdr.R
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import com.google.android.catalog.framework.annotations.Sample
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.withContext
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import java.util.function.Consumer
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@RequiresApi(34)
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@Sample(
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name = "Displaying UltraHDR (Compose)",
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description = "This sample demonstrates displaying an UltraHDR image in a Compose View and an Android View",
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documentation = "https://developer.android.com/guide/topics/media/hdr-image-format",
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tags = ["UltraHDR", "Compose"],
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)
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@Composable
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fun DisplayUltraHDRScreen() {
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var bitmap by remember { mutableStateOf<Bitmap?>(null) }
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val context = LocalContext.current
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var colorMode by remember { mutableStateOf<ColorMode>(ColorMode.Default) }
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val window = findWindow()
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val display = LocalView.current.display
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// Load asset and bitmap on background thread
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LaunchedEffect(Unit) {
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window?.let {
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colorMode = getColorMode(it, display)
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}
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// Same bitmap is used to load image in an image view and image (Compose)
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bitmap = withContext(Dispatchers.IO) {
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val ultraHdrImage = "gainmaps/night_highrise.jpg"
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context.assets.open(ultraHdrImage).use { inputStream ->
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BitmapFactory.decodeStream(inputStream)
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}
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}
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}
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val hdrSdrRatioChangeListener = Consumer<Display> { display ->
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if (window == null) return@Consumer
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Log.d(TAG, "HDR/SDR Ratio Changed ${display.hdrSdrRatio}")
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colorMode = getColorMode(window, display)
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}
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DisposableEffect(window, display) {
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if (display.isHdrSdrRatioAvailable) {
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display.registerHdrSdrRatioChangedListener(
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{ executable -> executable.run() },
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hdrSdrRatioChangeListener,
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)
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}
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// When the effect leaves the Composition, remove the observer
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onDispose {
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display.unregisterHdrSdrRatioChangedListener(hdrSdrRatioChangeListener)
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}
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}
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Column(
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modifier = Modifier.fillMaxWidth(),
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verticalArrangement = Arrangement.SpaceEvenly,
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horizontalAlignment = Alignment.CenterHorizontally,
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) {
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val details = when (colorMode) {
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is ColorMode.Default -> stringResource(R.string.color_mode_sdr)
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is ColorMode.Unknown -> stringResource(R.string.color_mode_unknown)
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is ColorMode.Hdr -> stringResource(
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R.string.color_mode_hdr_with_ratio,
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(colorMode as ColorMode.Hdr).hdrSdrRatio,
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)
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}
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Text(stringResource(R.string.color_mode_details, details))
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// Add SDR/HDR Color mode controls
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Row(
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horizontalArrangement = Arrangement.Center,
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modifier = Modifier.padding(dimensionResource(R.dimen.ultrahdr_color_mode_current_mode_padding)),
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) {
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Button(
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modifier = Modifier.weight(1f),
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onClick = { window?.colorMode = ActivityInfo.COLOR_MODE_DEFAULT },
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) {
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Text(stringResource(R.string.color_mode_sdr))
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}
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Spacer(Modifier.width(dimensionResource(R.dimen.ultrahdr_color_mode_current_mode_padding)))
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Button(
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modifier = Modifier.weight(1f),
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onClick = { window?.colorMode = ActivityInfo.COLOR_MODE_HDR },
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) {
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Text(stringResource(R.string.color_mode_hdr))
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}
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}
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// Render UltraHDR in a Compose Image
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Text(text = "Image (Compose)")
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if (bitmap != null) {
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Image(
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bitmap = bitmap!!.asImageBitmap(),
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contentDescription = null,
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modifier = Modifier.weight(1f),
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)
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}
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Divider(
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modifier = Modifier
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.fillMaxWidth()
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.padding(vertical = 4.dp),
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thickness = 1.dp,
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color = MaterialTheme.colorScheme.primary,
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)
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// Render UltraHDR in View (ImageView)
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Text(text = "ImageView (Android View)")
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AndroidView(
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modifier = Modifier.weight(1f),
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factory = {
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ImageView(it).apply {
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setImageBitmap(bitmap)
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}
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},
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update = {
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it.setImageBitmap(bitmap)
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},
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)
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}
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}
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private const val TAG = "DisplayUltraHDRScreen"
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private sealed interface ColorMode {
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object Default : ColorMode
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object Unknown : ColorMode
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@JvmInline
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value class Hdr(val hdrSdrRatio: Float) : ColorMode
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}
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@Composable
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private fun findWindow(): Window? =
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(LocalView.current.parent as? DialogWindowProvider)?.window ?: LocalContext.current.findWindow()
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private tailrec fun Context.findWindow(): Window? =
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when (this) {
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is Activity -> window
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is ContextWrapper -> baseContext.findWindow()
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else -> null
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}
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@RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
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private fun getColorMode(window: Window, display: Display) = when (window.colorMode) {
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ActivityInfo.COLOR_MODE_DEFAULT -> ColorMode.Default
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ActivityInfo.COLOR_MODE_HDR -> ColorMode.Hdr(display.hdrSdrRatio)
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else -> ColorMode.Unknown
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}

‎samples/graphics/ultrahdr/src/main/res/values/strings.xml‎

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<string name="color_mode_sdr">SDR</string>
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<string name="color_mode_hdr">HDR</string>
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<string name="color_mode_hdr_with_ratio">HDR | SDR/HDR Ratio = %f</string>
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<string name="color_mode_details">Color Mode = %s</string>
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<string name="color_mode_unknown">Unknown</string>
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<string name="refresh_ultrahdr_edited_image">Refresh</string>

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