| /* |
| * 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 "core/dom/ViewportDescription.h" |
| |
| #include "core/dom/Document.h" |
| #include "core/frame/FrameHost.h" |
| #include "core/frame/FrameView.h" |
| #include "core/frame/LocalFrame.h" |
| #include "core/frame/Settings.h" |
| #include "core/frame/VisualViewport.h" |
| #include "platform/Histogram.h" |
| #include "platform/weborigin/KURL.h" |
| |
| namespace blink { |
| |
| 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) |
| return initialViewportSize.width() * length.getFloatValue() / 100.0f; |
| |
| if (length.type() == Percent && direction == Vertical) |
| return initialViewportSize.height() * length.getFloatValue() / 100.0f; |
| |
| if (length.type() == DeviceWidth) |
| return initialViewportSize.width(); |
| |
| if (length.type() == DeviceHeight) |
| return initialViewportSize.height(); |
| |
| ASSERT_NOT_REACHED(); |
| return ViewportDescription::ValueAuto; |
| } |
| |
| PageScaleConstraints ViewportDescription::resolve(const FloatSize& initialViewportSize, Length legacyFallbackWidth) const |
| { |
| float resultWidth = ValueAuto; |
| |
| Length copyMaxWidth = maxWidth; |
| Length copyMinWidth = minWidth; |
| // In case the width (used for min- and max-width) is undefined. |
| if (isLegacyViewportType() && maxWidth.isAuto()) { |
| // The width viewport META property is translated into 'width' descriptors, setting |
| // the 'min' value to 'extend-to-zoom' and the 'max' value to the intended length. |
| // In case the UA-defines a min-width, use that as length. |
| if (zoom == ViewportDescription::ValueAuto) { |
| copyMinWidth = Length(ExtendToZoom); |
| copyMaxWidth = legacyFallbackWidth; |
| } else if (maxHeight.isAuto()) { |
| copyMinWidth = Length(ExtendToZoom); |
| copyMaxWidth = Length(ExtendToZoom); |
| } |
| } |
| |
| float resultMaxWidth = resolveViewportLength(copyMaxWidth, initialViewportSize, Horizontal); |
| float resultMinWidth = resolveViewportLength(copyMinWidth, 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; |
| bool resultUserZoom = userZoom; |
| |
| // 1. Resolve min-zoom and max-zoom values. |
| if (resultMinZoom != ViewportDescription::ValueAuto && resultMaxZoom != ViewportDescription::ValueAuto) |
| resultMaxZoom = std::max(resultMinZoom, resultMaxZoom); |
| |
| // 2. Constrain zoom value to the [min-zoom, max-zoom] range. |
| if (resultZoom != ViewportDescription::ValueAuto) |
| resultZoom = compareIgnoringAuto(resultMinZoom, compareIgnoringAuto(resultMaxZoom, resultZoom, std::min), std::max); |
| |
| float extendZoom = compareIgnoringAuto(resultZoom, resultMaxZoom, std::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, std::max); |
| |
| if (resultMinHeight == ViewportDescription::ValueExtendToZoom) |
| resultMinHeight = compareIgnoringAuto(extendHeight, resultMaxHeight, std::max); |
| } |
| |
| // 4. Resolve initial width from min/max descriptors. |
| if (resultMinWidth != ViewportDescription::ValueAuto || resultMaxWidth != ViewportDescription::ValueAuto) |
| resultWidth = compareIgnoringAuto(resultMinWidth, compareIgnoringAuto(resultMaxWidth, initialViewportSize.width(), std::min), std::max); |
| |
| // 5. Resolve initial height from min/max descriptors. |
| if (resultMinHeight != ViewportDescription::ValueAuto || resultMaxHeight != ViewportDescription::ValueAuto) |
| resultHeight = compareIgnoringAuto(resultMinHeight, compareIgnoringAuto(resultMaxHeight, initialViewportSize.height(), std::min), std::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 = std::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; |
| } |
| |
| void ViewportDescription::reportMobilePageStats(const LocalFrame* mainFrame) const |
| { |
| #if OS(ANDROID) |
| enum ViewportUMAType { |
| NoViewportTag, |
| DeviceWidth, |
| ConstantWidth, |
| MetaWidthOther, |
| MetaHandheldFriendly, |
| MetaMobileOptimized, |
| XhtmlMobileProfile, |
| TypeCount |
| }; |
| |
| if (!mainFrame || !mainFrame->host() || !mainFrame->view() || !mainFrame->document()) |
| return; |
| |
| // Avoid chrome:// pages like the new-tab page (on Android new tab is non-http). |
| if (!mainFrame->document()->url().protocolIsInHTTPFamily()) |
| return; |
| |
| DEFINE_STATIC_LOCAL(EnumerationHistogram, metaTagTypeHistogram, ("Viewport.MetaTagType", TypeCount)); |
| if (!isSpecifiedByAuthor()) { |
| metaTagTypeHistogram.count(mainFrame->document()->isMobileDocument() ? XhtmlMobileProfile : NoViewportTag); |
| return; |
| } |
| |
| if (isMetaViewportType()) { |
| if (maxWidth.type() == blink::Fixed) { |
| metaTagTypeHistogram.count(ConstantWidth); |
| |
| if (mainFrame->view()) { |
| // To get an idea of how "far" the viewport is from the device's ideal width, we |
| // report the zoom level that we'd need to be at for the entire page to be visible. |
| int viewportWidth = maxWidth.intValue(); |
| int windowWidth = mainFrame->host()->visualViewport().size().width(); |
| int overviewZoomPercent = 100 * windowWidth / static_cast<float>(viewportWidth); |
| DEFINE_STATIC_LOCAL(SparseHistogram, overviewZoomHistogram, ("Viewport.OverviewZoom")); |
| overviewZoomHistogram.sample(overviewZoomPercent); |
| } |
| |
| } else if (maxWidth.type() == blink::DeviceWidth || maxWidth.type() == blink::ExtendToZoom) { |
| metaTagTypeHistogram.count(DeviceWidth); |
| } else { |
| // Overflow bucket for cases we may be unaware of. |
| metaTagTypeHistogram.count(MetaWidthOther); |
| } |
| } else if (type == ViewportDescription::HandheldFriendlyMeta) { |
| metaTagTypeHistogram.count(MetaHandheldFriendly); |
| } else if (type == ViewportDescription::MobileOptimizedMeta) { |
| metaTagTypeHistogram.count(MobileOptimizedMeta); |
| } |
| #endif |
| } |
| |
| bool ViewportDescription::matchesHeuristicsForGpuRasterization() const |
| { |
| return maxWidth == Length(DeviceWidth) |
| && minZoom == 1.0 |
| && minZoomIsExplicit; |
| } |
| |
| } // namespace blink |
