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40 lines
1.1 KiB
C++
40 lines
1.1 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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gfxMatrix
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ComputeGLTransformForRotation(const nsIntRect& aBounds,
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ScreenRotation aRotation)
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{
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gfxMatrix transform;
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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(gfxPoint(aBounds.width, 0));
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transform.Rotate(M_PI / 2);
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break;
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case ROTATION_180:
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transform.Translate(gfxPoint(aBounds.width, aBounds.height));
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transform.Rotate(M_PI);
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break;
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case ROTATION_270:
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transform.Translate(gfxPoint(0, aBounds.height));
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transform.Rotate(M_PI * 3 / 2);
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break;
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default:
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MOZ_NOT_REACHED("Unknown rotation");
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break;
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}
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return transform;
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}
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} // namespace mozilla
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