API to determine if MIME type is supported.

This'll help developers decide if they can try decoding an image
file directly, or if they need to convert it to a more general
format first.

Bug: 126276695
Test: atest android.graphics.cts.ImageDecoderTest
Change-Id: I6a404e3be883ac14ac2e6376247d4209f8963908

1 files changed, 35 insertions, 0 deletions

diff --git a/graphics/java/android/graphics/ImageDecoder.java b/graphics/java/android/graphics/ImageDecoder.java
index 7016cc741e90..d3ca11c7f8b4 100644
--- a/graphics/java/android/graphics/ImageDecoder.java
+++ b/graphics/java/android/graphics/ImageDecoder.java
@@ -59,6 +59,8 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.lang.annotation.Retention;
 import java.nio.ByteBuffer;
+import java.util.Locale;
+import java.util.Objects;
 import java.util.concurrent.Callable;
 import java.util.concurrent.atomic.AtomicBoolean;
 
@@ -838,6 +840,39 @@ public final class ImageDecoder implements AutoCloseable {
     }
 
     /**
+     * Return if the given MIME type is a supported file format that can be
+     * decoded by this class. This can be useful to determine if a file can be
+     * decoded directly, or if it needs to be converted into a more general
+     * format using an API like {@link ContentResolver#openTypedAssetFile}.
+     */
+    public static boolean isMimeTypeSupported(@NonNull String mimeType) {
+        Objects.requireNonNull(mimeType);
+        switch (mimeType.toLowerCase(Locale.US)) {
+            case "image/png":
+            case "image/jpeg":
+            case "image/webp":
+            case "image/gif":
+            case "image/heif":
+            case "image/bmp":
+            case "image/x-ico":
+            case "image/vnd.wap.wbmp":
+            case "image/x-sony-arw":
+            case "image/x-canon-cr2":
+            case "image/x-adobe-dng":
+            case "image/x-nikon-nef":
+            case "image/x-nikon-nrw":
+            case "image/x-olympus-orf":
+            case "image/x-fuji-raf":
+            case "image/x-panasonic-rw2":
+            case "image/x-pentax-pef":
+            case "image/x-samsung-srw":
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    /**
      * Create a new {@link Source Source} from a resource.
      *
      * @param res the {@link Resources} object containing the image data.