gecko/widget/xpwidgets/WidgetUtils.cpp

40 lines
1.1 KiB
C++

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