Add highlighter toggle to brush bar.

feature/media-send/src/main/java/org/signal/mediasend/PreviewMediaConstraints.kt

@@ -7,6 +7,7 @@ package org.signal.mediasend
 
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
+import org.signal.mediasend.edit.image.BrushWidths
 import org.thoughtcrime.securesms.video.TranscodingConfig
 import kotlin.time.Duration.Companion.seconds
 
@@ -37,6 +38,7 @@ internal fun rememberPreviewState() = remember {
   MediaSendState(
     mediaConstraints = PreviewMediaConstraints,
     storyMaxVideoDuration = 30.seconds,
-    storiesEnabled = true
+    storiesEnabled = true,
+    brushWidths = BrushWidths(0f, 0f, 0f)
   )
 }

feature/media-send/src/main/java/org/signal/mediasend/edit/MediaEditScreen.kt

@@ -56,8 +56,7 @@ import org.signal.mediasend.edit.document.DocumentPage
 import org.signal.mediasend.edit.image.BrushWidthBar
 import org.signal.mediasend.edit.image.BrushWidthPreview
 import org.signal.mediasend.edit.image.BrushWidthsState
-import org.signal.mediasend.edit.image.ColorBarOrientation
-import org.signal.mediasend.edit.image.HSVColorBar
+import org.signal.mediasend.edit.image.DrawModeColorBar
 import org.signal.mediasend.edit.image.ImageEditor
 import org.signal.mediasend.edit.image.ImageEditorToolbar
 import org.signal.mediasend.edit.image.RotationDial
@@ -260,11 +259,7 @@ fun MediaEditScreen(
             }
 
             if (controller.isUserDrawing) {
-              HSVColorBar(
-                state = controller.drawColorBarState,
-                onColorChanged = controller::setDrawColor,
-                orientation = ColorBarOrientation.HORIZONTAL
-              )
+              DrawModeColorBar(imageEditorController = controller)
             }
 
             if (isSmallWindowBreakpoint) {

feature/media-send/src/main/java/org/signal/mediasend/edit/image/DrawModeColorBar.kt

@@ -0,0 +1,85 @@
+/*
+ * Copyright 2026 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.signal.mediasend.edit.image
+
+import androidx.compose.foundation.layout.Row
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import org.signal.core.ui.compose.DayNightPreviews
+import org.signal.core.ui.compose.IconButtons
+import org.signal.core.ui.compose.Previews
+import org.signal.core.ui.compose.SignalIcons
+import org.signal.core.ui.compose.theme.SignalTheme
+import org.signal.imageeditor.core.model.EditorModel
+import org.signal.mediasend.R
+import org.signal.mediasend.edit.ImageController
+
+/**
+ * Color bar that allows the user to change between highlighter and brush.
+ */
+@Composable
+internal fun DrawModeColorBar(
+  imageEditorController: ImageController
+) {
+  Row(
+    verticalAlignment = Alignment.CenterVertically
+  ) {
+    HSVColorBar(
+      state = imageEditorController.drawColorBarState,
+      onColorChanged = imageEditorController::setDrawColor,
+      orientation = ColorBarOrientation.HORIZONTAL
+    )
+
+    IconButtons.IconButton(
+      onClick = {
+        if (imageEditorController.mode == ImageController.Mode.DRAW) {
+          imageEditorController.enterHighlightMode()
+        } else {
+          imageEditorController.enterDrawMode()
+        }
+      },
+      colors = IconButtons.iconButtonColors(
+        containerColor = SignalTheme.colors.colorSurface5
+      ),
+      size = 40.dp
+    ) {
+      Icon(
+        imageVector = if (imageEditorController.mode == ImageController.Mode.DRAW) {
+          SignalIcons.BrushHighlighter.imageVector
+        } else {
+          SignalIcons.Draw.imageVector
+        },
+        contentDescription = stringResource(
+          if (imageEditorController.mode == ImageController.Mode.DRAW) {
+            R.string.DrawModeColorBar__highlighter
+          } else {
+            R.string.DrawModeColorBar__brush
+          }
+        )
+      )
+    }
+  }
+}
+
+@DayNightPreviews
+@Composable
+private fun DrawModeColorBarPreview() {
+  Previews.Preview {
+    DrawModeColorBar(
+      imageEditorController = remember {
+        ImageController(
+          editorModel = EditorModel.create(0),
+          brushWidths = BrushWidthsState()
+        )
+      }
+    )
+  }
+}

feature/media-send/src/main/res/values/strings.xml

@@ -46,6 +46,11 @@
   <!-- Name shown on the document preview when we cannot read the file\'s name. -->
   <string name="DocumentPage__unnamed_file">Unnamed file</string>
 
+  <!-- Content description for button to enable highlighter mode -->
+  <string name="DrawModeColorBar__highlighter">Highlighter</string>
+  <!-- Content description for button to enable brush mode -->
+  <string name="DrawModeColorBar__brush">Brush</string>
+
   <!-- Video editor play button content description -->
   <string name="VideoEditorHud_play_video_description">Play video</string>