[resources] Add functions to retrieve bytes from drawable or font res…

…ources.

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.*
 
 /**
@@ -32,4 +33,21 @@ expect fun Font(
     resource: FontResource,
     weight: FontWeight = FontWeight.Normal,
     style: FontStyle = FontStyle.Normal
-): Font
+): Font
+
+/**
+ * Retrieves an ByteArray using the specified font resource.
+ *
+ * @param resource The font resource to be used.
+ * @return The ByteArray loaded from the resource.
+ */
+@ExperimentalResourceApi
+@Composable
+fun getFontResourceBytes(resource: FontResource): ByteArray {
+    val resourceReader = LocalResourceReader.current
+    val bytes by rememberResourceState(resource, resourceReader, { ByteArray(0) }) { env ->
+        val item = resource.getResourceItemByEnvironment(env)
+        resourceReader.read(item.path)
+    }
+    return bytes
+}

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 +109,23 @@ private fun svgPainter(resource: DrawableResource): Painter {
     return svgPainter
 }
 
+/**
+ * Retrieves an ByteArray using the specified drawable resource.
+ *
+ * @param resource The drawable resource to be used.
+ * @return The ByteArray loaded from the resource.
+ */
+@ExperimentalResourceApi
+@Composable
+fun getDrawableResourceBytes(resource: DrawableResource): ByteArray {
+    val resourceReader = LocalResourceReader.current
+    val bytes by rememberResourceState(resource, resourceReader, { ByteArray(0) }) { env ->
+        val item = resource.getResourceItemByEnvironment(env)
+        resourceReader.read(item.path)
+    }
+    return bytes
+}
+
 internal expect fun ByteArray.toImageBitmap(): ImageBitmap
 internal expect fun ByteArray.toXmlElement(): Element
 internal expect fun ByteArray.toSvgElement(): SvgElement

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

@@ -304,4 +304,20 @@ class ComposeResourceTest {
         assertTrue(uri1.endsWith("/1.png"))
         assertTrue(uri2.endsWith("/2.png"))
     }
+
+    @OptIn(ExperimentalResourceApi::class)
+    @Test
+    fun testGetResourceBytes() = runComposeUiTest {
+        var imageBytes = ByteArray(0)
+        var fontBytes = ByteArray(0)
+        setContent {
+            CompositionLocalProvider(LocalComposeEnvironment provides TestComposeEnvironment) {
+                imageBytes = getDrawableResourceBytes(TestDrawableResource("1.png"))
+                fontBytes = getFontResourceBytes(TestFontResource("font_awesome.otf"))
+            }
+        }
+        waitForIdle()
+        assertEquals(946, imageBytes.size)
+        assertEquals(134808, fontBytes.size)
+    }
 }

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()