Make filter Context nullability explicit

encoder/src/main/java/com/pedro/encoder/input/gl/render/MainRender.kt

@@ -38,7 +38,7 @@ class MainRender {
   private var height = 0
   private var previewWidth = 0
   private var previewHeight = 0
-  private var context: Context? = null
+  private lateinit var context: Context
   private var filterRenders = mutableListOf<BaseFilterRender>()
   private val running = AtomicBoolean(false)
 

encoder/src/main/java/com/pedro/encoder/input/gl/render/filters/BaseFilterRender.java

@@ -20,6 +20,7 @@
 import android.opengl.GLES20;
 import android.os.Build;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.RequiresApi;
 
 import com.pedro.encoder.input.gl.render.BaseRenderOffScreen;
@@ -43,7 +44,8 @@ public abstract class BaseFilterRender extends BaseRenderOffScreen {
   private RenderHandler renderHandler = new RenderHandler();
   private RenderMode renderMode = RenderMode.ALL;
 
-  public void initGl(int width, int height, Context context, int previewWidth, int previewHeight) {
+  public void initGl(int width, int height, @NonNull Context context,
+      int previewWidth, int previewHeight) {
     this.width = width;
     this.height = height;
     this.previewWidth = previewWidth;
@@ -63,7 +65,7 @@ public void initFBOLink() {
         renderHandler.getTexId());
   }
 
-  protected abstract void initGlFilter(Context context);
+  protected abstract void initGlFilter(@NonNull Context context);
 
   public void draw() {
     GlUtil.checkGlError("drawFilter start");

encoder/src/main/java/com/pedro/encoder/input/gl/render/filters/CropFilterRender.kt

@@ -62,7 +62,7 @@ class CropFilterRender: BaseFilterRender() {
     Matrix.setIdentityM(positionMatrix, 0)
   }
 
-  override fun initGlFilter(context: Context?) {
+  override fun initGlFilter(context: Context) {
     val vertexShader = GlUtil.getStringFromRaw(context, R.raw.simple_vertex)
     val fragmentShader = GlUtil.getStringFromRaw(context, R.raw.simple_fragment)
     program = GlUtil.createProgram(vertexShader, fragmentShader)

encoder/src/main/java/com/pedro/encoder/utils/gl/GlUtil.java

@@ -25,6 +25,7 @@
 import android.opengl.GLES20;
 import android.os.Build;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.RequiresApi;
 
 import java.io.ByteArrayOutputStream;
@@ -97,7 +98,7 @@ public static void createExternalTextures(int quantity, int[] texturesId, int of
     createTextures(quantity, texturesId, offset, GLES20.GL_LINEAR, true);
   }
 
-  public static String getStringFromRaw(Context context, int id) {
+  public static String getStringFromRaw(@NonNull Context context, int id) {
     String str;
     try {
       Resources r = context.getResources();

encoder/src/test/java/com/pedro/encoder/input/gl/render/filters/BaseFilterRenderTest.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2024 pedroSG94.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.pedro.encoder.input.gl.render.filters;
+
+import android.content.Context;
+import android.content.ContextWrapper;
+
+import androidx.annotation.NonNull;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertSame;
+
+public class BaseFilterRenderTest {
+
+  @Test
+  public void initGlForwardsContextToFilter() {
+    Context expectedContext = new ContextWrapper(null);
+    TestFilterRender filterRender = new TestFilterRender();
+
+    filterRender.initGl(1, 1, expectedContext, 1, 1);
+
+    assertSame(expectedContext, filterRender.receivedContext);
+  }
+
+  private static final class TestFilterRender extends BaseFilterRender {
+
+    private Context receivedContext;
+
+    @Override
+    protected void initGlFilter(@NonNull Context context) {
+      receivedContext = context;
+    }
+
+    @Override
+    protected void drawFilter() {
+    }
+
+    @Override
+    protected void disableResources() {
+    }
+
+    @Override
+    public void release() {
+    }
+  }
+}