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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, 2011 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) 2012-2013 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.
*
*/
#include "config.h"
#include "core/dom/ViewportDescription.h"
using namespace std;
namespace WebCore {
static const float& compareIgnoringAuto(const float& value1, const float& value2, const float& (*compare) (const float&, const float&))
{
if (value1 == ViewportDescription::ValueAuto)
return value2;
if (value2 == ViewportDescription::ValueAuto)
return value1;
return compare(value1, value2);
}
float ViewportDescription::resolveViewportLength(const Length& length, const FloatSize& initialViewportSize, Direction direction)
{
if (length.isAuto())
return ViewportDescription::ValueAuto;
if (length.isFixed())
return length.getFloatValue();
if (length.type() == ExtendToZoom)
return ViewportDescription::ValueExtendToZoom;
if ((length.type() == Percent && direction == Horizontal) || length.type() == ViewportPercentageWidth)
return initialViewportSize.width() * length.getFloatValue() / 100.0f;
if ((length.type() == Percent && direction == Vertical) || length.type() == ViewportPercentageHeight)
return initialViewportSize.height() * length.getFloatValue() / 100.0f;
if (length.type() == ViewportPercentageMin)
return min(initialViewportSize.width(), initialViewportSize.height()) * length.viewportPercentageLength() / 100.0f;
if (length.type() == ViewportPercentageMax)
return max(initialViewportSize.width(), initialViewportSize.height()) * length.viewportPercentageLength() / 100.0f;
ASSERT_NOT_REACHED();
return ViewportDescription::ValueAuto;
}
PageScaleConstraints ViewportDescription::resolve(const FloatSize& initialViewportSize) const
{
float resultWidth = ValueAuto;
float resultMaxWidth = resolveViewportLength(maxWidth, initialViewportSize, Horizontal);
float resultMinWidth = resolveViewportLength(minWidth, initialViewportSize, Horizontal);
float resultHeight = ValueAuto;
float resultMaxHeight = resolveViewportLength(maxHeight, initialViewportSize, Vertical);
float resultMinHeight = resolveViewportLength(minHeight, initialViewportSize, Vertical);
float resultZoom = zoom;
float resultMinZoom = minZoom;
float resultMaxZoom = maxZoom;
float resultUserZoom = userZoom;
// 1. Resolve min-zoom and max-zoom values.
if (resultMinZoom != ViewportDescription::ValueAuto && resultMaxZoom != ViewportDescription::ValueAuto)
resultMaxZoom = max(resultMinZoom, resultMaxZoom);
// 2. Constrain zoom value to the [min-zoom, max-zoom] range.
if (resultZoom != ViewportDescription::ValueAuto)
resultZoom = compareIgnoringAuto(resultMinZoom, compareIgnoringAuto(resultMaxZoom, resultZoom, min), max);
float extendZoom = compareIgnoringAuto(resultZoom, resultMaxZoom, min);
// 3. Resolve non-"auto" lengths to pixel lengths.
if (extendZoom == ViewportDescription::ValueAuto) {
if (resultMaxWidth == ViewportDescription::ValueExtendToZoom)
resultMaxWidth = ViewportDescription::ValueAuto;
if (resultMaxHeight == ViewportDescription::ValueExtendToZoom)
resultMaxHeight = ViewportDescription::ValueAuto;
if (resultMinWidth == ViewportDescription::ValueExtendToZoom)
resultMinWidth = resultMaxWidth;
if (resultMinHeight == ViewportDescription::ValueExtendToZoom)
resultMinHeight = resultMaxHeight;
} else {
float extendWidth = initialViewportSize.width() / extendZoom;
float extendHeight = initialViewportSize.height() / extendZoom;
if (resultMaxWidth == ViewportDescription::ValueExtendToZoom)
resultMaxWidth = extendWidth;
if (resultMaxHeight == ViewportDescription::ValueExtendToZoom)
resultMaxHeight = extendHeight;
if (resultMinWidth == ViewportDescription::ValueExtendToZoom)
resultMinWidth = compareIgnoringAuto(extendWidth, resultMaxWidth, max);
if (resultMinHeight == ViewportDescription::ValueExtendToZoom)
resultMinHeight = compareIgnoringAuto(extendHeight, resultMaxHeight, max);
}
// 4. Resolve initial width from min/max descriptors.
if (resultMinWidth != ViewportDescription::ValueAuto || resultMaxWidth != ViewportDescription::ValueAuto)
resultWidth = compareIgnoringAuto(resultMinWidth, compareIgnoringAuto(resultMaxWidth, initialViewportSize.width(), min), max);
// 5. Resolve initial height from min/max descriptors.
if (resultMinHeight != ViewportDescription::ValueAuto || resultMaxHeight != ViewportDescription::ValueAuto)
resultHeight = compareIgnoringAuto(resultMinHeight, compareIgnoringAuto(resultMaxHeight, initialViewportSize.height(), min), max);
// 6-7. Resolve width value.
if (resultWidth == ViewportDescription::ValueAuto) {
if (resultHeight == ViewportDescription::ValueAuto || !initialViewportSize.height())
resultWidth = initialViewportSize.width();
else
resultWidth = resultHeight * (initialViewportSize.width() / initialViewportSize.height());
}
// 8. Resolve height value.
if (resultHeight == ViewportDescription::ValueAuto) {
if (!initialViewportSize.width())
resultHeight = initialViewportSize.height();
else
resultHeight = resultWidth * initialViewportSize.height() / initialViewportSize.width();
}
// Resolve initial-scale value.
if (resultZoom == ViewportDescription::ValueAuto) {
if (resultWidth != ViewportDescription::ValueAuto && resultWidth > 0)
resultZoom = initialViewportSize.width() / resultWidth;
if (resultHeight != ViewportDescription::ValueAuto && resultHeight > 0) {
// if 'auto', the initial-scale will be negative here and thus ignored.
resultZoom = max<float>(resultZoom, initialViewportSize.height() / resultHeight);
}
}
// If user-scalable = no, lock the min/max scale to the computed initial
// scale.
if (!resultUserZoom)
resultMinZoom = resultMaxZoom = resultZoom;
// Only set initialScale to a value if it was explicitly set.
if (zoom == ViewportDescription::ValueAuto)
resultZoom = ViewportDescription::ValueAuto;
PageScaleConstraints result;
result.minimumScale = resultMinZoom;
result.maximumScale = resultMaxZoom;
result.initialScale = resultZoom;
result.layoutSize.setWidth(resultWidth);
result.layoutSize.setHeight(resultHeight);
return result;
}
} // namespace WebCore
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