Add support for passing through Bitmaps and Drawables.

library/src/main/java/com/bumptech/glide/Glide.java

@@ -54,9 +54,11 @@ import com.bumptech.glide.load.resource.bitmap.DefaultImageHeaderParser;
 import com.bumptech.glide.load.resource.bitmap.Downsampler;
 import com.bumptech.glide.load.resource.bitmap.ResourceBitmapDecoder;
 import com.bumptech.glide.load.resource.bitmap.StreamBitmapDecoder;
+import com.bumptech.glide.load.resource.bitmap.UnitBitmapDecoder;
 import com.bumptech.glide.load.resource.bitmap.VideoBitmapDecoder;
 import com.bumptech.glide.load.resource.bytes.ByteBufferRewinder;
 import com.bumptech.glide.load.resource.drawable.ResourceDrawableDecoder;
+import com.bumptech.glide.load.resource.drawable.UnitDrawableDecoder;
 import com.bumptech.glide.load.resource.file.FileDecoder;
 import com.bumptech.glide.load.resource.gif.ByteBufferGifDecoder;
 import com.bumptech.glide.load.resource.gif.GifDrawable;
@@ -321,6 +323,9 @@ public class Glide implements ComponentCallbacks2 {
         .append(Registry.BUCKET_BITMAP, InputStream.class, Bitmap.class, streamBitmapDecoder)
         .append(
             Registry.BUCKET_BITMAP, ParcelFileDescriptor.class, Bitmap.class, videoBitmapDecoder)
+        .append(
+            Registry.BUCKET_BITMAP, Bitmap.class, Bitmap.class, new UnitBitmapDecoder(bitmapPool))
+        .append(Bitmap.class, Bitmap.class, UnitModelLoader.Factory.<Bitmap>getInstance())
         .append(Bitmap.class, bitmapEncoder)
         /* BitmapDrawables */
         .append(
@@ -406,6 +411,8 @@ public class Glide implements ComponentCallbacks2 {
         .append(byte[].class, ByteBuffer.class, new ByteArrayLoader.ByteBufferFactory())
         .append(byte[].class, InputStream.class, new ByteArrayLoader.StreamFactory())
         .append(Uri.class, Uri.class, UnitModelLoader.Factory.<Uri>getInstance())
+        .append(Drawable.class, Drawable.class, UnitModelLoader.Factory.<Drawable>getInstance())
+        .append(Drawable.class, Drawable.class, new UnitDrawableDecoder(bitmapPool))
         /* Transcoders */
         .register(
             Bitmap.class,

library/src/main/java/com/bumptech/glide/RequestBuilder.java

 package com.bumptech.glide;
 
+import static com.bumptech.glide.request.RequestOptions.diskCacheStrategyOf;
 import static com.bumptech.glide.request.RequestOptions.signatureOf;
 
 import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.support.annotation.CheckResult;
 import android.support.annotation.DrawableRes;
@@ -317,7 +320,58 @@ public class RequestBuilder<TranscodeType> implements Cloneable {
   }
 
   /**
-   * Returns a request builder to load the given {@link java.lang.String}. signature.
+   * Returns a request builder to load the given {@link Bitmap}.
+   *
+   * <p>{@link Bitmap}s provided to this method become owned by Glide. The {@link Bitmap} may be
+   * recycled or re-used at any time. If you do not own the Bitmap or you need to continue to use
+   * the {@link Bitmap} after passing it in to Glide, consider passing a copy of the {@link Bitmap}
+   * to Glide instead. It's almost always better to allow Glide to load {@link Bitmap}s than
+   * pass {@link Bitmap}s into Glide. If you have a custom way to obtain {@link Bitmap}s that is
+   * not supported by Glide, consider registering a custom
+   * {@link com.bumptech.glide.load.model.ModelLoader} or
+   * {@link com.bumptech.glide.load.ResourceDecoder} instead.
+   *
+   * <p>The {@link DiskCacheStrategy} is set to {@link DiskCacheStrategy#NONE}. Using other
+   * strategies may result in undefined behavior.
+   *
+   * <p>In memory caching relies on Object equality. The contents of the {@link Bitmap}s are not
+   * compared.
+   *
+   * @see #load(Object)
+   */
+  @CheckResult
+  public RequestBuilder<TranscodeType> load(@Nullable Bitmap bitmap) {
+    return loadGeneric(bitmap)
+        .apply(diskCacheStrategyOf(DiskCacheStrategy.NONE));
+  }
+
+  /**
+   * Returns a request builder to load the given {@link Drawable}.
+   *
+   * <p>{@link Drawable}s provided to this method become owned by Glide. They or {@link Bitmap}s
+   * they contain may be recycled or re-used at any time. If you do not own the {@link Drawable},
+   * do not pass it in to Glide. It's almost always better to allow Glide to load {@link Bitmap}s
+   * than pass {@link Bitmap}s into Glide. If you have a custom way to obtain {@link Bitmap}s that
+   * is not supported by Glide, consider registering a custom
+   * {@link com.bumptech.glide.load.model.ModelLoader} or
+   * {@link com.bumptech.glide.load.ResourceDecoder} instead.
+   *
+   * <p>The {@link DiskCacheStrategy} is set to {@link DiskCacheStrategy#NONE}. Using other
+   * strategies may result in undefined behavior.
+   *
+   * <p>In memory caching relies on Object equality. The contents of the {@link Drawable}s are not
+   * compared.
+   *
+   * @see #load(Object)
+   */
+  @CheckResult
+  public RequestBuilder<TranscodeType> load(@Nullable Drawable drawable) {
+    return loadGeneric(drawable)
+        .apply(diskCacheStrategyOf(DiskCacheStrategy.NONE));
+  }
+
+  /**
+   * Returns a request builder to load the given {@link java.lang.String}.
    *
    * <p> Note - this method caches data using only the given String as the cache key. If the data is
    * a Uri outside of your control, or you otherwise expect the data represented by the given String

library/src/main/java/com/bumptech/glide/load/resource/bitmap/UnitBitmapDecoder.java

+package com.bumptech.glide.load.resource.bitmap;
+
+import android.graphics.Bitmap;
+import android.support.annotation.Nullable;
+import com.bumptech.glide.load.Options;
+import com.bumptech.glide.load.ResourceDecoder;
+import com.bumptech.glide.load.engine.Resource;
+import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
+import java.io.IOException;
+
+public final class UnitBitmapDecoder implements ResourceDecoder<Bitmap, Bitmap> {
+
+  private final BitmapPool bitmapPool;
+
+  public UnitBitmapDecoder(BitmapPool bitmapPool) {
+    this.bitmapPool = bitmapPool;
+  }
+
+  @Override
+  public boolean handles(Bitmap source, Options options) throws IOException {
+    return true;
+  }
+
+  @Nullable
+  @Override
+  public Resource<Bitmap> decode(Bitmap source, int width, int height, Options options)
+      throws IOException {
+    return new BitmapResource(source, bitmapPool);
+  }
+}

library/src/main/java/com/bumptech/glide/load/resource/drawable/DrawableResourceImpl.java

+package com.bumptech.glide.load.resource.drawable;
+
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+import com.bumptech.glide.load.engine.Resource;
+import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
+import com.bumptech.glide.load.resource.bitmap.BitmapDrawableResource;
+
+/**
+ * Handles generic {@link Drawable} types where we may be uncertain of their size or type.
+ */
+final class DrawableResourceImpl extends DrawableResource<Drawable> {
+
+  @SuppressWarnings("unchecked")
+  public static Resource<Drawable> newInstance(Drawable drawable, BitmapPool bitmapPool) {
+    if (drawable instanceof BitmapDrawable) {
+      BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
+      return (Resource<Drawable>) (Resource<? extends Drawable>)
+          new BitmapDrawableResource(bitmapDrawable, bitmapPool);
+    }
+    return new DrawableResourceImpl(drawable);
+  }
+
+  private DrawableResourceImpl(Drawable drawable) {
+    super(drawable);
+  }
+
+  @SuppressWarnings("unchecked")
+  @Override
+  public Class<Drawable> getResourceClass() {
+    return (Class<Drawable>) drawable.getClass();
+  }
+
+  @Override
+  public int getSize() {
+    // 4 bytes per pixel for ARGB_8888 Bitmaps is something of a reasonable approximation. If
+    // there are no intrinsic bounds, we can fall back just to 1.
+    return Math.max(1, drawable.getIntrinsicWidth() * drawable.getIntrinsicHeight() * 4);
+  }
+
+  @Override
+  public void recycle() {
+    // Do nothing.
+  }
+}

library/src/main/java/com/bumptech/glide/load/resource/drawable/ResourceDrawableDecoder.java

@@ -3,7 +3,6 @@ package com.bumptech.glide.load.resource.drawable;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.pm.PackageManager.NameNotFoundException;
-import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.support.annotation.DrawableRes;
@@ -12,7 +11,6 @@ import com.bumptech.glide.load.Options;
 import com.bumptech.glide.load.ResourceDecoder;
 import com.bumptech.glide.load.engine.Resource;
 import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
-import com.bumptech.glide.load.resource.bitmap.BitmapDrawableResource;
 import java.io.IOException;
 import java.util.List;
 
@@ -56,17 +54,7 @@ public class ResourceDrawableDecoder implements ResourceDecoder<Uri, Drawable> {
         ? context : getContextForPackage(source, packageName);
     // We can't get a theme from another application.
     Drawable drawable = DrawableDecoderCompat.getDrawable(toUse, resId);
-    return getDrawableResource(drawable);
-  }
-
-  @SuppressWarnings("unchecked")
-  private Resource<Drawable> getDrawableResource(Drawable drawable) {
-   if (drawable instanceof BitmapDrawable) {
-      BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
-      return (Resource<Drawable>) (Resource<? extends Drawable>)
-          new BitmapDrawableResource(bitmapDrawable, bitmapPool);
-    }
-    return new InternalDrawableResource(drawable);
+    return DrawableResourceImpl.newInstance(drawable, bitmapPool);
   }
 
   @NonNull
@@ -103,29 +91,4 @@ public class ResourceDrawableDecoder implements ResourceDecoder<Uri, Drawable> {
      }
      return result;
   }
-
-  private static final class InternalDrawableResource extends DrawableResource<Drawable> {
-
-    InternalDrawableResource(Drawable drawable) {
-      super(drawable);
-    }
-
-    @SuppressWarnings("unchecked")
-    @Override
-    public Class<Drawable> getResourceClass() {
-      return (Class<Drawable>) drawable.getClass();
-    }
-
-    @Override
-    public int getSize() {
-      // 4 bytes per pixel for ARGB_8888 Bitmaps is something of a reasonable approximation. If
-      // there are no intrinsic bounds, we can fall back just to 1.
-      return Math.max(1, drawable.getIntrinsicWidth() * drawable.getIntrinsicHeight() * 4);
-    }
-
-    @Override
-    public void recycle() {
-      // Do nothing.
-    }
-  }
 }

library/src/main/java/com/bumptech/glide/load/resource/drawable/UnitDrawableDecoder.java

+package com.bumptech.glide.load.resource.drawable;
+
+import android.graphics.drawable.Drawable;
+import android.support.annotation.Nullable;
+import com.bumptech.glide.load.Options;
+import com.bumptech.glide.load.ResourceDecoder;
+import com.bumptech.glide.load.engine.Resource;
+import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
+import java.io.IOException;
+
+/**
+ * Passes through a {@link Drawable} as a {@link Drawable} based {@link Resource}.
+ */
+public class UnitDrawableDecoder implements ResourceDecoder<Drawable, Drawable> {
+  private final BitmapPool bitmapPool;
+
+  public UnitDrawableDecoder(BitmapPool bitmapPool) {
+    this.bitmapPool = bitmapPool;
+  }
+
+  @Override
+  public boolean handles(Drawable source, Options options) throws IOException {
+    return true;
+  }
+
+  @Nullable
+  @Override
+  public Resource<Drawable> decode(Drawable source, int width, int height, Options options)
+      throws IOException {
+    return DrawableResourceImpl.newInstance(source, bitmapPool);
+  }
+}

library/src/test/java/com/bumptech/glide/GlideTest.java

@@ -3,8 +3,10 @@ package com.bumptech.glide;
 import static com.bumptech.glide.request.RequestOptions.decodeTypeOf;
 import static com.bumptech.glide.request.RequestOptions.errorOf;
 import static com.bumptech.glide.request.RequestOptions.placeholderOf;
+import static com.google.common.truth.Truth.assertThat;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
+import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.anyInt;
 import static org.mockito.Matchers.eq;
 import static org.mockito.Matchers.isA;
@@ -70,6 +72,7 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
 import org.mockito.invocation.InvocationOnMock;
 import org.mockito.stubbing.Answer;
 import org.robolectric.RobolectricTestRunner;
@@ -554,6 +557,40 @@ public class GlideTest {
     verify(target).onLoadFailed(eq(error));
   }
 
+  @Test
+  public void testLoadBitmap_asBitmap() {
+    Bitmap bitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);
+    requestManager
+        .asBitmap()
+        .load(bitmap)
+        .into(target);
+
+    verify(target).onResourceReady(eq(bitmap), any(Transition.class));
+  }
+
+  @Test
+  public void testLoadBitmap_asDrawable() {
+    Bitmap bitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);
+    requestManager
+        .load(bitmap)
+        .into(target);
+
+    ArgumentCaptor<Object> captor = ArgumentCaptor.forClass(Object.class);
+    verify(target).onResourceReady(captor.capture(), any(Transition.class));
+    BitmapDrawable drawable = (BitmapDrawable) captor.getValue();
+    assertThat(drawable.getBitmap()).isEqualTo(bitmap);
+  }
+
+  @Test
+  public void testLoadDrawable() {
+    Drawable drawable = new ColorDrawable(Color.RED);
+    requestManager
+        .load(drawable)
+        .into(target);
+
+    verify(target).onResourceReady(eq(drawable), any(Transition.class));
+  }
+
   @Test
   public void testNullModelPrefersFallbackDrawable() {
     Drawable placeholder = new ColorDrawable(Color.GREEN);