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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* (C) 2006 Alexey Proskuryakov (ap@webkit.org)
* Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2012 Intel Corporation. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include "FloatSize.h"
#include <wtf/Forward.h>
namespace WebCore {
class Document;
enum class ViewportErrorCode : uint8_t {
UnrecognizedViewportArgumentKey,
UnrecognizedViewportArgumentValue,
TruncatedViewportArgumentValue,
MaximumScaleTooLarge,
};
enum class ViewportFit : uint8_t {
Auto,
Contain,
Cover
};
struct ViewportAttributes {
FloatSize layoutSize;
float initialScale;
float minimumScale;
float maximumScale;
float userScalable;
float orientation;
float shrinkToFit;
ViewportFit viewportFit;
};
struct ViewportArguments {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
enum class Type : uint8_t {
// These are ordered in increasing importance.
Implicit,
#if PLATFORM(IOS_FAMILY)
ImageDocument,
#endif
ViewportMeta,
} type;
static constexpr int ValueAuto = -1;
static constexpr int ValueDeviceWidth = -2;
static constexpr int ValueDeviceHeight = -3;
static constexpr int ValuePortrait = -4;
static constexpr int ValueLandscape = -5;
explicit ViewportArguments(Type type = Type::Implicit)
: type(type)
{
}
ViewportArguments(ViewportArguments&&) = default;
ViewportArguments(const ViewportArguments&) = default;
ViewportArguments& operator=(ViewportArguments&&) = default;
ViewportArguments& operator=(const ViewportArguments&) = default;
ViewportArguments(Type type, float width, float height, float zoom, float minZoom, float maxZoom, float userZoom, float orientation, float shrinkToFit, ViewportFit viewportFit, bool widthWasExplicit)
: type(type)
, width(width)
, height(height)
, zoom(zoom)
, minZoom(minZoom)
, maxZoom(maxZoom)
, userZoom(userZoom)
, orientation(orientation)
, shrinkToFit(shrinkToFit)
, viewportFit(viewportFit)
, widthWasExplicit(widthWasExplicit)
{
}
// All arguments are in CSS units.
ViewportAttributes resolve(const FloatSize& initialViewportSize, const FloatSize& deviceSize, int defaultWidth) const;
float width { ValueAuto };
float height { ValueAuto };
float zoom { ValueAuto };
float minZoom { ValueAuto };
float maxZoom { ValueAuto };
float userZoom { ValueAuto };
float orientation { ValueAuto };
float shrinkToFit { ValueAuto };
ViewportFit viewportFit { ViewportFit::Auto };
bool widthWasExplicit { false };
bool operator==(const ViewportArguments& other) const
{
// Used for figuring out whether to reset the viewport or not,
// thus we are not taking type into account.
return width == other.width
&& height == other.height
&& zoom == other.zoom
&& minZoom == other.minZoom
&& maxZoom == other.maxZoom
&& userZoom == other.userZoom
&& orientation == other.orientation
&& shrinkToFit == other.shrinkToFit
&& viewportFit == other.viewportFit
&& widthWasExplicit == other.widthWasExplicit;
}
#if PLATFORM(GTK)
// FIXME: We're going to keep this constant around until all embedders
// refactor their code to no longer need it.
static const float deprecatedTargetDPI;
#endif
};
WEBCORE_EXPORT ViewportAttributes computeViewportAttributes(ViewportArguments args, int desktopWidth, int deviceWidth, int deviceHeight, float devicePixelRatio, IntSize visibleViewport);
WEBCORE_EXPORT void restrictMinimumScaleFactorToViewportSize(ViewportAttributes& result, IntSize visibleViewport, float devicePixelRatio);
WEBCORE_EXPORT void restrictScaleFactorToInitialScaleIfNotUserScalable(ViewportAttributes& result);
WEBCORE_EXPORT float computeMinimumScaleFactorForContentContained(const ViewportAttributes& result, const IntSize& viewportSize, const IntSize& contentSize);
typedef Function<void(ViewportErrorCode, const String&)> ViewportErrorHandler;
void setViewportFeature(ViewportArguments&, Document&, StringView key, StringView value);
WEBCORE_EXPORT void setViewportFeature(ViewportArguments&, StringView key, StringView value, const ViewportErrorHandler&);
WEBCORE_EXPORT WTF::TextStream& operator<<(WTF::TextStream&, const ViewportArguments&);
} // namespace WebCore
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