Implement Bitmap Transformation with Size Limit

android/src/main/java/com/dylanvann/fastimage/FastImageViewManager.java

@@ -61,11 +61,6 @@ public void setSource(FastImageViewWithUrl view, @Nullable ReadableMap source) {
         view.setSource(source);
     }
 
-    @ReactProp(name = "disableTransformation")
-    public void setDisableTransformation(FastImageViewWithUrl view, @Nullable Boolean disableTransformation) {
-        view.disableTransformation(disableTransformation);
-    }
-
     @ReactProp(name = "defaultSource")
     public void setDefaultSource(FastImageViewWithUrl view, @Nullable String source) {
         view.setDefaultSource(

android/src/main/java/com/dylanvann/fastimage/FastImageViewWithUrl.java

@@ -39,7 +39,6 @@ class FastImageViewWithUrl extends AppCompatImageView {
     private boolean mNeedsReload = false;
     private ReadableMap mSource = null;
     private Drawable mDefaultSource = null;
-    private boolean mDisableTransformation = false;
 
     public GlideUrl glideUrl;
 
@@ -52,11 +51,6 @@ public void setSource(@Nullable ReadableMap source) {
         mSource = source;
     }
 
-    public void disableTransformation(@Nullable boolean disableTransform) {
-        mNeedsReload = true;
-        mDisableTransformation = disableTransform;
-    }
-
     public void setDefaultSource(@Nullable Drawable source) {
         mNeedsReload = true;
         mDefaultSource = source;
@@ -182,11 +176,8 @@ public boolean onResourceReady(File resource, Object model, Target<File> target,
                             .apply(FastImageViewConverter
                                     .getOptions(context, imageSource, mSource)
                                     .placeholder(mDefaultSource) // show until loaded
-                                    .fallback(mDefaultSource)); // null will not be treated as error
-
-            if (mDisableTransformation) {
-                builder = builder.dontTransform();
-            }
+                                    .fallback(mDefaultSource))
+                            .transform(new ResizeTransformation());
 
             if (key != null)
                 builder.listener(new FastImageRequestListener(key));

android/src/main/java/com/dylanvann/fastimage/ResizeTransformation.java

@@ -0,0 +1,41 @@
+package com.dylanvann.fastimage;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+
+import androidx.annotation.NonNull;
+
+import com.bumptech.glide.load.Transformation;
+import com.bumptech.glide.load.engine.Resource;
+import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
+import com.bumptech.glide.load.resource.bitmap.BitmapResource;
+
+import java.security.MessageDigest;
+
+public class ResizeTransformation implements Transformation<Bitmap> {
+
+    private final double MAX_BYTES = 25000000.0;
+
+    @NonNull
+    @Override
+    public Resource<Bitmap> transform(@NonNull Context context, @NonNull Resource<Bitmap> resource, int outWidth, int outHeight) {
+        Bitmap toTransform = resource.get();
+
+        if (toTransform.getByteCount() > MAX_BYTES) {
+            double scaleFactor = Math.sqrt(MAX_BYTES / (double) toTransform.getByteCount());
+            int newHeight = (int) (outHeight * scaleFactor);
+            int newWidth = (int) (outWidth * scaleFactor);
+
+            BitmapPool pool = GlideApp.get(context).getBitmapPool();
+            Bitmap scaledBitmap =  Bitmap.createScaledBitmap(toTransform, newWidth, newHeight, true);
+            return BitmapResource.obtain(scaledBitmap, pool);
+        }
+
+        return resource;
+    }
+
+    @Override
+    public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
+        messageDigest.update(("ResizeTransformation").getBytes());
+    }
+}

src/index.tsx

@@ -1,20 +1,20 @@
 import React, { forwardRef, memo } from 'react'
 import {
-    View,
-    Image,
-    NativeModules,
-    requireNativeComponent,
-    StyleSheet,
+    AccessibilityProps,
+    ColorValue,
     FlexStyle,
+    Image,
+    ImageRequireSource,
     LayoutChangeEvent,
+    NativeModules,
+    Platform,
     ShadowStyleIOS,
     StyleProp,
+    StyleSheet,
     TransformsStyle,
-    ImageRequireSource,
-    Platform,
-    AccessibilityProps,
+    View,
     ViewProps,
-    ColorValue,
+    requireNativeComponent,
 } from 'react-native'
 
 export type ResizeMode = 'contain' | 'cover' | 'stretch' | 'center'
@@ -54,8 +54,8 @@ export type Source = {
 
 export interface OnLoadStartEvent {
     nativeEvent: {
-        cachePath: string | null;
-    };
+        cachePath: string | null
+    }
 }
 
 export interface OnLoadEvent {
@@ -124,13 +124,6 @@ export interface FastImageProps extends AccessibilityProps, ViewProps {
      */
     tintColor?: ColorValue
 
-    /**
-     * If supplied, the original size of the resource without any transformations will be displayed.
-     * 
-     * @platform android
-     */
-    disableTransformation?: boolean
-
     /**
      * A unique identifier for this element to be used in UI Automation testing scripts.
      */