1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/widget/xpwidgets/WidgetUtils.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,38 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + * vim: sw=2 ts=8 et :
1.6 + */
1.7 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.8 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.9 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.10 +
1.11 +#include "mozilla/WidgetUtils.h"
1.12 +
1.13 +namespace mozilla {
1.14 +
1.15 +gfx::Matrix
1.16 +ComputeTransformForRotation(const nsIntRect& aBounds,
1.17 + ScreenRotation aRotation)
1.18 +{
1.19 + gfx::Matrix transform;
1.20 + switch (aRotation) {
1.21 + case ROTATION_0:
1.22 + break;
1.23 + case ROTATION_90:
1.24 + transform.Translate(aBounds.width, 0);
1.25 + transform = gfx::Matrix::Rotation(M_PI / 2) * transform;
1.26 + break;
1.27 + case ROTATION_180:
1.28 + transform.Translate(aBounds.width, aBounds.height);
1.29 + transform = gfx::Matrix::Rotation(M_PI) * transform;
1.30 + break;
1.31 + case ROTATION_270:
1.32 + transform.Translate(0, aBounds.height);
1.33 + transform = gfx::Matrix::Rotation(M_PI * 3 / 2) * transform;
1.34 + break;
1.35 + default:
1.36 + MOZ_CRASH("Unknown rotation");
1.37 + }
1.38 + return transform;
1.39 +}
1.40 +
1.41 +} // namespace mozilla
