[resources] Add functions to retrieve bytes from drawable or font resources. (#4651)

Implemented two new experimental functions:
```kotlin
/**
 * Retrieves the byte array of the drawable resource.
 *
 * @param environment The resource environment, which can be obtained from [rememberResourceEnvironment] or [getSystemResourceEnvironment].
 * @param resource The drawable resource.
 * @return The byte array representing the drawable resource.
 */
@ExperimentalResourceApi
suspend fun getDrawableResourceBytes(
    environment: ResourceEnvironment,
    resource: DrawableResource
): ByteArray {...}

/**
 * Retrieves the byte array of the font resource.
 *
 * @param environment The resource environment, which can be obtained from [rememberResourceEnvironment] or [getSystemResourceEnvironment].
 * @param resource The font resource.
 * @return The byte array representing the font resource.
 */
@ExperimentalResourceApi
suspend fun getFontResourceBytes(
    environment: ResourceEnvironment,
    resource: FontResource
): ByteArray {...}
```

fixes https://github.com/JetBrains/compose-multiplatform/issues/4360

components/README.md

@@ -13,10 +13,6 @@ in Android Studio or in AppCode with [installed CocoaPods](https://kotlinlang.or
 ### Run JS in browser with WebAssembly Skia via Gradle:
 `./gradlew :resources:demo:shared:jsBrowserDevelopmentRun`
 
-### Run MacOS via Gradle:
- - on Intel CPU: `./gradlew :resources:demo:shared:runDebugExecutableMacosX64`
- - on Apple Silicon: `./gradlew :resources:demo:shared:runDebugExecutableMacosArm64`
-
 # Tests
 Run script: 
 ```bash

components/gradle.properties

@@ -8,7 +8,7 @@ android.useAndroidX=true
 
 #Versions
 kotlin.version=1.9.23
-compose.version=1.6.10-beta01
+compose.version=1.6.10-dev1596
 agp.version=8.2.2
 
 #Compose

components/resources/demo/shared/build.gradle.kts

@@ -39,24 +39,8 @@ kotlin {
         binaries.executable()
     }
 
-    listOf(
-        macosX64(),
-        macosArm64()
-    ).forEach { macosTarget ->
-        macosTarget.binaries {
-            executable {
-                entryPoint = "main"
-            }
-        }
-    }
-
     applyDefaultHierarchyTemplate()
     sourceSets {
-        all {
-            languageSettings {
-                optIn("org.jetbrains.compose.resources.ExperimentalResourceApi")
-            }
-        }
         val desktopMain by getting
         val wasmJsMain by getting
 

components/resources/demo/shared/src/commonMain/kotlin/org/jetbrains/compose/resources/demo/shared/FileRes.kt

@@ -9,11 +9,16 @@ import androidx.compose.runtime.*
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
 import components.resources.demo.shared.generated.resources.Res
+import components.resources.demo.shared.generated.resources.droid_icon
+import org.jetbrains.compose.resources.ExperimentalResourceApi
+import org.jetbrains.compose.resources.getDrawableResourceBytes
+import org.jetbrains.compose.resources.rememberResourceEnvironment
 
+@OptIn(ExperimentalResourceApi::class)
 @Composable
 fun FileRes(paddingValues: PaddingValues) {
     Column(
-        modifier = Modifier.padding(paddingValues)
+        modifier = Modifier.padding(paddingValues).verticalScroll(rememberScrollState())
     ) {
         Text(
             modifier = Modifier.padding(16.dp),
@@ -48,6 +53,34 @@ fun FileRes(paddingValues: PaddingValues) {
                 Text(bytes.decodeToString())
             """.trimIndent()
         )
+        HorizontalDivider(modifier = Modifier.fillMaxWidth().padding(bottom = 16.dp))
+        OutlinedCard(
+            modifier = Modifier.padding(horizontal = 16.dp),
+            shape = RoundedCornerShape(4.dp),
+            colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.primaryContainer)
+        ) {
+            val composeEnv = rememberResourceEnvironment()
+            var bytes by remember { mutableStateOf(ByteArray(0)) }
+            LaunchedEffect(Unit) {
+                bytes = getDrawableResourceBytes(composeEnv, Res.drawable.droid_icon)
+            }
+            Text(
+                modifier = Modifier.padding(8.dp),
+                text = "droid_icon byte size = " + bytes.size,
+                color = MaterialTheme.colorScheme.onPrimaryContainer
+            )
+        }
+        Text(
+            modifier = Modifier.padding(16.dp),
+            text = """
+                val composeEnv = rememberResourceEnvironment()
+                var bytes by remember { mutableStateOf(ByteArray(0)) }
+                LaunchedEffect(Unit) {
+                    bytes = getDrawableResourceBytes(composeEnv, Res.drawable.droid_icon)
+                }
+                Text("droid_icon byte size = " + bytes.size)
+            """.trimIndent()
+        )
         Text(
             modifier = Modifier.padding(16.dp),
             text = "File: 'files/platform-text.txt'",
@@ -80,5 +113,23 @@ fun FileRes(paddingValues: PaddingValues) {
                 Text(bytes.decodeToString())
             """.trimIndent()
         )
+        HorizontalDivider(modifier = Modifier.fillMaxWidth().padding(bottom = 16.dp))
+        OutlinedCard(
+            modifier = Modifier.padding(horizontal = 16.dp),
+            shape = RoundedCornerShape(4.dp),
+            colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.primaryContainer)
+        ) {
+            Text(
+                modifier = Modifier.padding(8.dp),
+                text = "File URI: " + Res.getUri("files/platform-text.txt"),
+                color = MaterialTheme.colorScheme.onPrimaryContainer
+            )
+        }
+        Text(
+            modifier = Modifier.padding(16.dp),
+            text = """
+                Text("File URI: " + Res.getUri("files/platform-text.txt"))
+            """.trimIndent()
+        )
     }
 }

components/resources/demo/shared/src/macosMain/composeResources/files/platform-text.txt

@@ -1 +0,0 @@
-macOS platform

components/resources/demo/shared/src/macosMain/kotlin/main.macos.kt

@@ -1,17 +0,0 @@
-/*
- * Copyright 2020-2022 JetBrains s.r.o. and respective authors and developers.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE.txt file.
- */
-
-import androidx.compose.ui.window.Window
-import org.jetbrains.compose.resources.demo.shared.UseResources
-import platform.AppKit.NSApp
-import platform.AppKit.NSApplication
-
-fun main() {
-    NSApplication.sharedApplication()
-    Window("Resources demo") {
-        UseResources()
-    }
-    NSApp?.run()
-}

components/resources/library/build.gradle.kts

@@ -53,6 +53,7 @@ kotlin {
                 optIn("kotlinx.cinterop.ExperimentalForeignApi")
                 optIn("kotlin.experimental.ExperimentalNativeApi")
                 optIn("org.jetbrains.compose.resources.InternalResourceApi")
+                optIn("org.jetbrains.compose.resources.ExperimentalResourceApi")
             }
         }
 

components/resources/library/src/commonMain/kotlin/org/jetbrains/compose/resources/FontResources.kt

@@ -2,6 +2,7 @@ package org.jetbrains.compose.resources
 
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.Immutable
+import androidx.compose.runtime.getValue
 import androidx.compose.ui.text.font.*
 
 /**
@@ -33,3 +34,19 @@ expect fun Font(
     weight: FontWeight = FontWeight.Normal,
     style: FontStyle = FontStyle.Normal
 ): Font
+
+/**
+ * Retrieves the byte array of the font resource.
+ *
+ * @param environment The resource environment, which can be obtained from [rememberResourceEnvironment] or [getSystemResourceEnvironment].
+ * @param resource The font resource.
+ * @return The byte array representing the font resource.
+ */
+@ExperimentalResourceApi
+suspend fun getFontResourceBytes(
+    environment: ResourceEnvironment,
+    resource: FontResource
+): ByteArray {
+    val resourceItem = resource.getResourceItemByEnvironment(environment)
+    return DefaultResourceReader.read(resourceItem.path)
+}

components/resources/library/src/commonMain/kotlin/org/jetbrains/compose/resources/ImageResources.kt

@@ -95,7 +95,6 @@ internal expect fun SvgElement.toSvgPainter(density: Density): Painter
 
 private val emptySvgPainter: Painter by lazy { BitmapPainter(emptyImageBitmap) }
 
-@OptIn(ExperimentalResourceApi::class)
 @Composable
 private fun svgPainter(resource: DrawableResource): Painter {
     val resourceReader = LocalResourceReader.current
@@ -110,6 +109,22 @@ private fun svgPainter(resource: DrawableResource): Painter {
     return svgPainter
 }
 
+/**
+ * Retrieves the byte array of the drawable resource.
+ *
+ * @param environment The resource environment, which can be obtained from [rememberResourceEnvironment] or [getSystemResourceEnvironment].
+ * @param resource The drawable resource.
+ * @return The byte array representing the drawable resource.
+ */
+@ExperimentalResourceApi
+suspend fun getDrawableResourceBytes(
+    environment: ResourceEnvironment,
+    resource: DrawableResource
+): ByteArray {
+    val resourceItem = resource.getResourceItemByEnvironment(environment)
+    return DefaultResourceReader.read(resourceItem.path)
+}
+
 internal expect fun ByteArray.toImageBitmap(): ImageBitmap
 internal expect fun ByteArray.toXmlElement(): Element
 internal expect fun ByteArray.toSvgElement(): SvgElement

components/resources/library/src/commonMain/kotlin/org/jetbrains/compose/resources/PluralStringResources.kt

@@ -43,7 +43,24 @@ fun pluralStringResource(resource: PluralStringResource, quantity: Int): String
  * @throws IllegalArgumentException If the provided ID or the pluralization is not found in the resource file.
  */
 suspend fun getPluralString(resource: PluralStringResource, quantity: Int): String =
-    loadPluralString(resource, quantity, DefaultResourceReader, getResourceEnvironment())
+    loadPluralString(resource, quantity, DefaultResourceReader, getSystemResourceEnvironment())
+
+/**
+ * Loads a string using the specified string resource.
+ *
+ * @param environment The resource environment.
+ * @param resource The string resource to be used.
+ * @param quantity The quantity of the pluralization to use.
+ * @return The loaded string resource.
+ *
+ * @throws IllegalArgumentException If the provided ID or the pluralization is not found in the resource file.
+ */
+@ExperimentalResourceApi
+suspend fun getPluralString(
+    environment: ResourceEnvironment,
+    resource: PluralStringResource,
+    quantity: Int
+): String = loadPluralString(resource, quantity, DefaultResourceReader, environment)
 
 private suspend fun loadPluralString(
     resource: PluralStringResource,
@@ -99,9 +116,33 @@ suspend fun getPluralString(resource: PluralStringResource, quantity: Int, varar
         resource, quantity,
         formatArgs.map { it.toString() },
         DefaultResourceReader,
-        getResourceEnvironment(),
+        getSystemResourceEnvironment(),
     )
 
+/**
+ * Loads a string using the specified string resource.
+ *
+ * @param environment The resource environment.
+ * @param resource The string resource to be used.
+ * @param quantity The quantity of the pluralization to use.
+ * @param formatArgs The arguments to be inserted into the formatted string.
+ * @return The loaded string resource.
+ *
+ * @throws IllegalArgumentException If the provided ID or the pluralization is not found in the resource file.
+ */
+@ExperimentalResourceApi
+suspend fun getPluralString(
+    environment: ResourceEnvironment,
+    resource: PluralStringResource,
+    quantity: Int,
+    vararg formatArgs: Any
+): String = loadPluralString(
+    resource, quantity,
+    formatArgs.map { it.toString() },
+    DefaultResourceReader,
+    environment
+)
+
 private suspend fun loadPluralString(
     resource: PluralStringResource,
     quantity: Int,

components/resources/library/src/commonMain/kotlin/org/jetbrains/compose/resources/ResourceEnvironment.kt

@@ -5,12 +5,35 @@ import androidx.compose.runtime.*
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.text.intl.Locale
 
-internal data class ResourceEnvironment(
-    val language: LanguageQualifier,
-    val region: RegionQualifier,
-    val theme: ThemeQualifier,
-    val density: DensityQualifier
-)
+@ExperimentalResourceApi
+class ResourceEnvironment internal constructor(
+    internal val language: LanguageQualifier,
+    internal val region: RegionQualifier,
+    internal val theme: ThemeQualifier,
+    internal val density: DensityQualifier
+) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other == null || this::class != other::class) return false
+
+        other as ResourceEnvironment
+
+        if (language != other.language) return false
+        if (region != other.region) return false
+        if (theme != other.theme) return false
+        if (density != other.density) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = language.hashCode()
+        result = 31 * result + region.hashCode()
+        result = 31 * result + theme.hashCode()
+        result = 31 * result + density.hashCode()
+        return result
+    }
+}
 
 internal interface ComposeEnvironment {
     @Composable
@@ -39,14 +62,32 @@ internal val DefaultComposeEnvironment = object : ComposeEnvironment {
 //ComposeEnvironment provider will be overridden for tests
 internal val LocalComposeEnvironment = staticCompositionLocalOf { DefaultComposeEnvironment }
 
+/**
+ * Returns an instance of [ResourceEnvironment].
+ *
+ * The [ResourceEnvironment] class represents the environment for resources.
+ *
+ * @return An instance of [ResourceEnvironment] representing the current environment.
+ */
+@ExperimentalResourceApi
+@Composable
+fun rememberResourceEnvironment(): ResourceEnvironment {
+    val composeEnvironment = LocalComposeEnvironment.current
+    return composeEnvironment.rememberEnvironment()
+}
+
 internal expect fun getSystemEnvironment(): ResourceEnvironment
 
 //the function reference will be overridden for tests
+//@TestOnly
+internal var getResourceEnvironment = ::getSystemEnvironment
+
 /**
- * Provides the resource environment for non-composable access to string resources.
+ * Provides the resource environment for non-composable access to resources.
  * It is an expensive operation! Don't use it in composable functions with no cache!
  */
-internal var getResourceEnvironment = ::getSystemEnvironment
+@ExperimentalResourceApi
+fun getSystemResourceEnvironment(): ResourceEnvironment = getResourceEnvironment()
 
 @OptIn(InternalResourceApi::class)
 internal fun Resource.getResourceItemByEnvironment(environment: ResourceEnvironment): ResourceItem {

components/resources/library/src/commonMain/kotlin/org/jetbrains/compose/resources/StringArrayResources.kt

@@ -46,7 +46,22 @@ fun stringArrayResource(resource: StringArrayResource): List<String> {
  * @throws IllegalStateException if the string array with the given ID is not found.
  */
 suspend fun getStringArray(resource: StringArrayResource): List<String> =
-    loadStringArray(resource, DefaultResourceReader, getResourceEnvironment())
+    loadStringArray(resource, DefaultResourceReader, getSystemResourceEnvironment())
+
+/**
+ * Loads a list of strings using the specified string array resource.
+ *
+ * @param environment The resource environment.
+ * @param resource The string array resource to be used.
+ * @return A list of strings representing the items in the string array.
+ *
+ * @throws IllegalStateException if the string array with the given ID is not found.
+ */
+@ExperimentalResourceApi
+suspend fun getStringArray(
+    environment: ResourceEnvironment,
+    resource: StringArrayResource
+): List<String> = loadStringArray(resource, DefaultResourceReader, environment)
 
 private suspend fun loadStringArray(
     resource: StringArrayResource,

components/resources/library/src/commonMain/kotlin/org/jetbrains/compose/resources/StringResources.kt

@@ -39,7 +39,20 @@ fun stringResource(resource: StringResource): String {
  * @throws IllegalArgumentException If the provided ID is not found in the resource file.
  */
 suspend fun getString(resource: StringResource): String =
-    loadString(resource, DefaultResourceReader, getResourceEnvironment())
+    loadString(resource, DefaultResourceReader, getSystemResourceEnvironment())
+
+/**
+ * Loads a string using the specified string resource.
+ *
+ * @param environment The resource environment.
+ * @param resource The string resource to be used.
+ * @return The loaded string resource.
+ *
+ * @throws IllegalArgumentException If the provided ID is not found in the resource file.
+ */
+@ExperimentalResourceApi
+suspend fun getString(environment: ResourceEnvironment, resource: StringResource): String =
+    loadString(resource, DefaultResourceReader, environment)
 
 private suspend fun loadString(
     resource: StringResource,
@@ -83,7 +96,29 @@ suspend fun getString(resource: StringResource, vararg formatArgs: Any): String
     resource,
     formatArgs.map { it.toString() },
     DefaultResourceReader,
-    getResourceEnvironment()
+    getSystemResourceEnvironment()
+)
+
+/**
+ * Loads a formatted string using the specified string resource and arguments.
+ *
+ * @param environment The resource environment.
+ * @param resource The string resource to be used.
+ * @param formatArgs The arguments to be inserted into the formatted string.
+ * @return The formatted string resource.
+ *
+ * @throws IllegalArgumentException If the provided ID is not found in the resource file.
+ */
+@ExperimentalResourceApi
+suspend fun getString(
+    environment: ResourceEnvironment,
+    resource: StringResource,
+    vararg formatArgs: Any
+): String = loadString(
+    resource,
+    formatArgs.map { it.toString() },
+    DefaultResourceReader,
+    environment
 )
 
 private suspend fun loadString(

components/resources/library/src/commonTest/kotlin/org/jetbrains/compose/resources/ComposeResourceTest.kt

@@ -6,7 +6,6 @@ import androidx.compose.runtime.*
 import androidx.compose.ui.test.ExperimentalTestApi
 import androidx.compose.ui.test.runComposeUiTest
 import kotlinx.coroutines.test.runTest
-import org.jetbrains.skiko.URIManager
 import kotlin.test.*
 
 @OptIn(ExperimentalTestApi::class, InternalResourceApi::class)
@@ -304,4 +303,27 @@ class ComposeResourceTest {
         assertTrue(uri1.endsWith("/1.png"))
         assertTrue(uri2.endsWith("/2.png"))
     }
+
+    @OptIn(ExperimentalResourceApi::class)
+    @Test
+    fun testGetResourceBytes() = runTest {
+        val env = getSystemEnvironment()
+        val imageBytes = getDrawableResourceBytes(env, TestDrawableResource("1.png"))
+        assertEquals(946, imageBytes.size)
+        val fontBytes = getFontResourceBytes(env, TestFontResource("font_awesome.otf"))
+        assertEquals(134808, fontBytes.size)
+    }
+
+    @OptIn(ExperimentalResourceApi::class)
+    @Test
+    fun testGetResourceEnvironment() = runComposeUiTest {
+        var environment: ResourceEnvironment? = null
+        setContent {
+            environment = rememberResourceEnvironment()
+        }
+        waitForIdle()
+
+        val systemEnvironment = getSystemEnvironment()
+        assertEquals(systemEnvironment, environment)
+    }
 }

components/resources/library/src/commonTest/kotlin/org/jetbrains/compose/resources/TestUtils.kt

@@ -40,6 +40,11 @@ internal fun TestDrawableResource(path: String) = DrawableResource(
     setOf(ResourceItem(emptySet(), path, -1, -1))
 )
 
+internal fun TestFontResource(path: String) = FontResource(
+    path,
+    setOf(ResourceItem(emptySet(), path, -1, -1))
+)
+
 internal fun parsePluralSamples(samples: String): List<Int> {
     return samples.split(',').flatMap {
         val range = it.trim()