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