[DocsUI M3] Fix the corner pixelation for thumbnail

Thumbnail corner in list/grid view shows a weird pixelation
issue, this CL applies a custom outline to the ImageView
which holds the thumbnail to fix the issue.

Check the attached bug for the before/after comparison.

Bug: 403413105
Test: m DocumentsUIGoogle && manual inspection
Flag: com.android.documentsui.flags.use_material3
Change-Id: I8ac34e5b0fc7d92d36006a9e2bb8315ef8cb5dca

3 files changed, 45 insertions, 0 deletions

diff --git a/src/com/android/documentsui/IconUtils.java b/src/com/android/documentsui/IconUtils.java
index 1763fd2a3..ece38bb64 100644
--- a/src/com/android/documentsui/IconUtils.java
+++ b/src/com/android/documentsui/IconUtils.java
@@ -19,8 +19,12 @@ package com.android.documentsui;
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.content.pm.ProviderInfo;
+import android.graphics.Outline;
 import android.graphics.drawable.Drawable;
 import android.util.TypedValue;
+import android.view.View;
+import android.view.ViewOutlineProvider;
+import android.widget.ImageView;
 
 import com.android.documentsui.base.UserId;
 
@@ -80,4 +84,32 @@ public class IconUtils {
         context.getTheme().resolveAttribute(tintAttrId, outValue, true);
         return applyTintColor(context, drawableId, outValue.resourceId);
     }
+
+    /**
+     * When a ImageView loads a thumbnail from a bitmap, we usually uses a CardView to wrap it to
+     * apply CardView's corner radius to the ImageView. This causes the corner pixelation of the
+     * thumbnail especially when there's a border (stroke) around the CardView. This method creates
+     * a custom clip outline with the correct shape to fix this issue.
+     *
+     * @param imageView ImageView to apply clip outline.
+     * @param strokeWidth stroke width of the thumbnail.
+     * @param cornerRadius corner radius of the thumbnail.
+     */
+    public static void applyThumbnailClipOutline(
+            ImageView imageView, int strokeWidth, int cornerRadius) {
+        ViewOutlineProvider outlineProvider =
+                new ViewOutlineProvider() {
+                    @Override
+                    public void getOutline(View view, Outline outline) {
+                        outline.setRoundRect(
+                                strokeWidth,
+                                strokeWidth,
+                                view.getWidth() - strokeWidth,
+                                view.getHeight() - strokeWidth,
+                                cornerRadius);
+                    }
+                };
+        imageView.setOutlineProvider(outlineProvider);
+        imageView.setClipToOutline(true);
+    }
 }
diff --git a/src/com/android/documentsui/dirlist/GridDocumentHolder.java b/src/com/android/documentsui/dirlist/GridDocumentHolder.java
index 9523c331c..72ba1c3f9 100644
--- a/src/com/android/documentsui/dirlist/GridDocumentHolder.java
+++ b/src/com/android/documentsui/dirlist/GridDocumentHolder.java
@@ -41,6 +41,7 @@ import androidx.annotation.RequiresApi;
 
 import com.android.documentsui.ConfigStore;
 import com.android.documentsui.DocumentsApplication;
+import com.android.documentsui.IconUtils;
 import com.android.documentsui.R;
 import com.android.documentsui.base.DocumentInfo;
 import com.android.documentsui.base.Shared;
@@ -112,6 +113,13 @@ final class GridDocumentHolder extends DocumentHolder {
         mIconBadge = (ImageView) itemView.findViewById(R.id.icon_profile_badge);
         mPreviewIcon = itemView.findViewById(R.id.preview_icon);
 
+        if (isUseMaterial3FlagEnabled()) {
+            int clipCornerRadius = context.getResources()
+                    .getDimensionPixelSize(R.dimen.thumbnail_clip_corner_radius);
+            IconUtils.applyThumbnailClipOutline(
+                    mIconThumb, mThumbnailStrokeWidth, clipCornerRadius);
+        }
+
         mIconHelper = iconHelper;
 
         if (SdkLevel.isAtLeastT() && !mConfigStore.isPrivateSpaceInDocsUIEnabled()) {
diff --git a/src/com/android/documentsui/dirlist/ListDocumentHolder.java b/src/com/android/documentsui/dirlist/ListDocumentHolder.java
index 24b7e3ae5..d91c9547e 100644
--- a/src/com/android/documentsui/dirlist/ListDocumentHolder.java
+++ b/src/com/android/documentsui/dirlist/ListDocumentHolder.java
@@ -43,6 +43,7 @@ import androidx.annotation.RequiresApi;
 
 import com.android.documentsui.ConfigStore;
 import com.android.documentsui.DocumentsApplication;
+import com.android.documentsui.IconUtils;
 import com.android.documentsui.R;
 import com.android.documentsui.base.DocumentInfo;
 import com.android.documentsui.base.Lookup;
@@ -109,6 +110,10 @@ final class ListDocumentHolder extends DocumentHolder {
             mThumbnailStrokeWidth =
                     context.getResources()
                             .getDimensionPixelSize(R.dimen.list_item_thumbnail_border_width);
+            int clipCornerRadius = context.getResources()
+                    .getDimensionPixelSize(R.dimen.thumbnail_clip_corner_radius);
+            IconUtils.applyThumbnailClipOutline(
+                    mIconThumb, mThumbnailStrokeWidth, clipCornerRadius);
         } else {
             mThumbnailStrokeWidth = 0;
         }