image provider improvements

mobile/android/app/src/main/cpp/native_buffer.c

@@ -0,0 +1,52 @@
+#include <jni.h>
+#include <stdlib.h>
+
+JNIEXPORT jlong JNICALL
+Java_app_alextran_immich_images_ThumbnailsImpl_00024Companion_allocateNative(
+    JNIEnv *env, jclass clazz, jint size)
+{
+    void *ptr = malloc(size);
+    return (jlong)ptr;
+}
+
+JNIEXPORT jlong JNICALL
+Java_app_alextran_immich_images_ThumbnailsImpl_allocateNative(
+    JNIEnv *env, jclass clazz, jint size)
+{
+    void *ptr = malloc(size);
+    return (jlong)ptr;
+}
+
+JNIEXPORT void JNICALL
+Java_app_alextran_immich_images_ThumbnailsImpl_00024Companion_freeNative(
+    JNIEnv *env, jclass clazz, jlong address)
+{
+    if (address != 0)
+    {
+        free((void *)address);
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_app_alextran_immich_images_ThumbnailsImpl_freeNative(
+    JNIEnv *env, jclass clazz, jlong address)
+{
+    if (address != 0)
+    {
+        free((void *)address);
+    }
+}
+
+JNIEXPORT jobject JNICALL
+Java_app_alextran_immich_images_ThumbnailsImpl_00024Companion_wrapAsBuffer(
+    JNIEnv *env, jclass clazz, jlong address, jint capacity)
+{
+    return (*env)->NewDirectByteBuffer(env, (void*)address, capacity);
+}
+
+JNIEXPORT jobject JNICALL
+Java_app_alextran_immich_images_ThumbnailsImpl_wrapAsBuffer(
+    JNIEnv *env, jclass clazz, jlong address, jint capacity)
+{
+    return (*env)->NewDirectByteBuffer(env, (void*)address, capacity);
+}