michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * vim: sw=2 ts=8 et :
michael@0:  */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "mozilla/WidgetUtils.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: gfx::Matrix
michael@0: ComputeTransformForRotation(const nsIntRect& aBounds,
michael@0:                               ScreenRotation aRotation)
michael@0: {
michael@0:     gfx::Matrix transform;
michael@0:     switch (aRotation) {
michael@0:     case ROTATION_0:
michael@0:         break;
michael@0:     case ROTATION_90:
michael@0:         transform.Translate(aBounds.width, 0);
michael@0:         transform = gfx::Matrix::Rotation(M_PI / 2) * transform;
michael@0:         break;
michael@0:     case ROTATION_180:
michael@0:         transform.Translate(aBounds.width, aBounds.height);
michael@0:         transform = gfx::Matrix::Rotation(M_PI) * transform;
michael@0:         break;
michael@0:     case ROTATION_270:
michael@0:         transform.Translate(0, aBounds.height);
michael@0:         transform = gfx::Matrix::Rotation(M_PI * 3 / 2) * transform;
michael@0:         break;
michael@0:     default:
michael@0:         MOZ_CRASH("Unknown rotation");
michael@0:     }
michael@0:     return transform;
michael@0: }
michael@0: 
michael@0: } // namespace mozilla