LibTest/typed_data/Int32x4List/Int32x4List.view_A01_t01.dart

// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion
/// Int32x4List.view(
///    ByteBuffer buffer, [
///    int offsetInBytes = 0,
///    int length
/// ])
/// Creates a Int32x4List view of the specified region in buffer.
/// @description Checks that an instance of Int32x4List of specified length with
/// correct elements is created.
/// @author ngl@unipro.ru

import "dart:typed_data";
import "../../../Utils/expect.dart";

Int32x4 i32x4(n) => new Int32x4(n, n, n, n);

equal(o1, o2) => o1.x == o2.x && o1.y == o2.y && o1.z == o2.z && o1.w == o2.w;

void check(List<Int32x4> list, offset, length) {
  var l = new Int32x4List.fromList(list);
  var buffer = l.buffer;
  var view = new Int32x4List.view(buffer, offset, length);
  Expect.isTrue(view is Int32x4List);
  Expect.runtimeIsType<Int32x4List>(view);
  Expect.equals(view.length, length);
  for (int i = 0; i < view.length; ++i) {
    Expect.isTrue(equal(l[i + (offset >> 4) as int], view[i]));
  }
}

main() {
  var list = [
    i32x4(0), i32x4(1), i32x4(2), i32x4(3), i32x4(4), i32x4(5), i32x4(6),
    i32x4(7),i32x4(8), i32x4(9)
  ];
  check([], 0, 0);
  check([i32x4(1)], 0, 1);
  check(list, 0, 10);
  check(list, 2 * Int32x4List.bytesPerElement, 8);
  check(list, 3 * Int32x4List.bytesPerElement, 6);
}