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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2001 Dirk Mueller (mueller (at) kde.org)
      5  *           (C) 2006 Alexey Proskuryakov (ap (at) webkit.org)
      6  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
      7  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
      8  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
      9  *
     10  * This library is free software; you can redistribute it and/or
     11  * modify it under the terms of the GNU Library General Public
     12  * License as published by the Free Software Foundation; either
     13  * version 2 of the License, or (at your option) any later version.
     14  *
     15  * This library is distributed in the hope that it will be useful,
     16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     18  * Library General Public License for more details.
     19  *
     20  * You should have received a copy of the GNU Library General Public License
     21  * along with this library; see the file COPYING.LIB.  If not, write to
     22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     23  * Boston, MA 02110-1301, USA.
     24  *
     25  */
     26 
     27 #ifndef ViewportArguments_h
     28 #define ViewportArguments_h
     29 
     30 #include "IntSize.h"
     31 #include <wtf/Forward.h>
     32 
     33 namespace WebCore {
     34 
     35 class Document;
     36 
     37 enum ViewportErrorCode {
     38     UnrecognizedViewportArgumentKeyError,
     39     UnrecognizedViewportArgumentValueError,
     40     TruncatedViewportArgumentValueError,
     41     MaximumScaleTooLargeError,
     42     TargetDensityDpiTooSmallOrLargeError
     43 };
     44 
     45 struct ViewportAttributes {
     46     IntSize layoutSize;
     47 
     48     float devicePixelRatio;
     49 
     50     float initialScale;
     51     float minimumScale;
     52     float maximumScale;
     53 
     54     float userScalable;
     55 };
     56 
     57 struct ViewportArguments {
     58 
     59     enum {
     60         ValueAuto = -1,
     61         ValueDesktopWidth = -2,
     62         ValueDeviceWidth = -3,
     63         ValueDeviceHeight = -4,
     64         ValueDeviceDPI = -5,
     65         ValueLowDPI = -6,
     66         ValueMediumDPI = -7,
     67         ValueHighDPI = -8
     68     };
     69 
     70     ViewportArguments()
     71         : initialScale(ValueAuto)
     72         , minimumScale(ValueAuto)
     73         , maximumScale(ValueAuto)
     74         , width(ValueAuto)
     75         , height(ValueAuto)
     76         , targetDensityDpi(ValueAuto)
     77         , userScalable(ValueAuto)
     78     {
     79     }
     80 
     81     float initialScale;
     82     float minimumScale;
     83     float maximumScale;
     84     float width;
     85     float height;
     86     float targetDensityDpi;
     87     float userScalable;
     88 
     89     bool operator==(const ViewportArguments& other) const
     90     {
     91         return initialScale == other.initialScale
     92             && minimumScale == other.minimumScale
     93             && maximumScale == other.maximumScale
     94             && width == other.width
     95             && height == other.height
     96             && targetDensityDpi == other.targetDensityDpi
     97             && userScalable == other.userScalable;
     98     }
     99 };
    100 
    101 ViewportAttributes computeViewportAttributes(ViewportArguments args, int desktopWidth, int deviceWidth, int deviceHeight, int deviceDPI, IntSize visibleViewport);
    102 
    103 void setViewportFeature(const String& keyString, const String& valueString, Document*, void* data);
    104 void reportViewportWarning(Document*, ViewportErrorCode, const String& replacement1, const String& replacement2);
    105 
    106 } // namespace WebCore
    107 
    108 #endif // ViewportArguments_h
    109