[general] moving ios and android project under ./platform folder

platform/android/src/bitmap_factory.cpp

@@ -0,0 +1,25 @@
+#include "bitmap_factory.hpp"
+
+namespace mbgl {
+namespace android {
+
+void BitmapFactory::registerNative(jni::JNIEnv& env) {
+    jni::Class<BitmapFactory>::Singleton(env);
+}
+
+jni::Local<jni::Object<Bitmap>> BitmapFactory::DecodeByteArray(jni::JNIEnv& env,
+                                                               jni::Array<jni::jbyte>& data,
+                                                               jni::jint offset,
+                                                               jni::jint length) {
+    static auto& _class = jni::Class<BitmapFactory>::Singleton(env);
+
+    // Images are loaded with ARGB_8888 config, and premultiplied by default, which is exactly
+    // what we want, so we're not providing a BitmapFactory.Options object.
+    using Signature = jni::Object<Bitmap> (jni::Array<jni::jbyte>, jni::jint, jni::jint);
+    static auto method = _class.GetStaticMethod<Signature>(env, "decodeByteArray");
+
+    return _class.Call(env, method, data, offset, length);
+}
+
+} // namespace android
+} // namespace mbgl