gecko-dev/widget/xpwidgets/WidgetUtils.cpp

41 строка
1.2 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 {
gfx::Matrix
ComputeTransformForRotation(const nsIntRect& aBounds,
ScreenRotation aRotation)
{
gfx::Matrix transform;
static const gfx::Float floatPi = static_cast<gfx::Float>(M_PI);
switch (aRotation) {
case ROTATION_0:
break;
case ROTATION_90:
transform.Translate(aBounds.width, 0);
transform = gfx::Matrix::Rotation(floatPi / 2) * transform;
break;
case ROTATION_180:
transform.Translate(aBounds.width, aBounds.height);
transform = gfx::Matrix::Rotation(floatPi) * transform;
break;
case ROTATION_270:
transform.Translate(0, aBounds.height);
transform = gfx::Matrix::Rotation(floatPi * 3 / 2) * transform;
break;
default:
MOZ_CRASH("Unknown rotation");
}
return transform;
}
} // namespace mozilla