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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 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 "ViewportArguments.h"
#include "Document.h"
#include "Frame.h"
#include "IntSize.h"
#include "ScriptableDocumentParser.h"
#include "Settings.h"
#include <wtf/text/TextStream.h>
namespace WebCore {
typedef Function<void(ViewportErrorCode, StringView, StringView)> InternalViewportErrorHandler;
#if PLATFORM(GTK)
const float ViewportArguments::deprecatedTargetDPI = 160;
#endif
static const float& compareIgnoringAuto(const float& value1, const float& value2, const float& (*compare) (const float&, const float&))
{
ASSERT(value1 != ViewportArguments::ValueAuto || value2 != ViewportArguments::ValueAuto);
if (value1 == ViewportArguments::ValueAuto)
return value2;
if (value2 == ViewportArguments::ValueAuto)
return value1;
return compare(value1, value2);
}
static inline float clampLengthValue(float value)
{
ASSERT(value != ViewportArguments::ValueDeviceWidth);
ASSERT(value != ViewportArguments::ValueDeviceHeight);
// Limits as defined in the css-device-adapt spec.
if (value != ViewportArguments::ValueAuto)
return std::min<float>(10000, std::max<float>(value, 1));
return value;
}
static inline float clampScaleValue(float value)
{
ASSERT(value != ViewportArguments::ValueDeviceWidth);
ASSERT(value != ViewportArguments::ValueDeviceHeight);
// Limits as defined in the css-device-adapt spec.
if (value != ViewportArguments::ValueAuto)
return std::min<float>(10, std::max<float>(value, 0.1));
return value;
}
ViewportAttributes ViewportArguments::resolve(const FloatSize& initialViewportSize, const FloatSize& deviceSize, int defaultWidth) const
{
float resultWidth = width;
float resultMaxWidth = maxWidth;
float resultMinWidth = minWidth;
float resultHeight = height;
float resultMinHeight = minHeight;
float resultMaxHeight = maxHeight;
float resultZoom = zoom;
float resultMinZoom = minZoom;
float resultMaxZoom = maxZoom;
switch (int(resultWidth)) {
case ViewportArguments::ValueDeviceWidth:
resultWidth = deviceSize.width();
break;
case ViewportArguments::ValueDeviceHeight:
resultWidth = deviceSize.height();
break;
}
switch (int(resultHeight)) {
case ViewportArguments::ValueDeviceWidth:
resultHeight = deviceSize.width();
break;
case ViewportArguments::ValueDeviceHeight:
resultHeight = deviceSize.height();
break;
}
if (type == ViewportArguments::CSSDeviceAdaptation) {
switch (int(resultMinWidth)) {
case ViewportArguments::ValueDeviceWidth:
resultMinWidth = deviceSize.width();
break;
case ViewportArguments::ValueDeviceHeight:
resultMinWidth = deviceSize.height();
break;
}
switch (int(resultMaxWidth)) {
case ViewportArguments::ValueDeviceWidth:
resultMaxWidth = deviceSize.width();
break;
case ViewportArguments::ValueDeviceHeight:
resultMaxWidth = deviceSize.height();
break;
}
switch (int(resultMinHeight)) {
case ViewportArguments::ValueDeviceWidth:
resultMinHeight = deviceSize.width();
break;
case ViewportArguments::ValueDeviceHeight:
resultMinHeight = deviceSize.height();
break;
}
switch (int(resultMaxHeight)) {
case ViewportArguments::ValueDeviceWidth:
resultMaxHeight = deviceSize.width();
break;
case ViewportArguments::ValueDeviceHeight:
resultMaxHeight = deviceSize.height();
break;
}
if (resultMinWidth != ViewportArguments::ValueAuto || resultMaxWidth != ViewportArguments::ValueAuto)
resultWidth = compareIgnoringAuto(resultMinWidth, compareIgnoringAuto(resultMaxWidth, deviceSize.width(), std::min), std::max);
if (resultMinHeight != ViewportArguments::ValueAuto || resultMaxHeight != ViewportArguments::ValueAuto)
resultHeight = compareIgnoringAuto(resultMinHeight, compareIgnoringAuto(resultMaxHeight, deviceSize.height(), std::min), std::max);
if (resultMinZoom != ViewportArguments::ValueAuto && resultMaxZoom != ViewportArguments::ValueAuto)
resultMaxZoom = std::max(resultMinZoom, resultMaxZoom);
if (resultZoom != ViewportArguments::ValueAuto)
resultZoom = compareIgnoringAuto(resultMinZoom, compareIgnoringAuto(resultMaxZoom, resultZoom, std::min), std::max);
if (resultWidth == ViewportArguments::ValueAuto && resultZoom == ViewportArguments::ValueAuto)
resultWidth = deviceSize.width();
if (resultWidth == ViewportArguments::ValueAuto && resultHeight == ViewportArguments::ValueAuto)
resultWidth = deviceSize.width() / resultZoom;
if (resultWidth == ViewportArguments::ValueAuto)
resultWidth = resultHeight * deviceSize.width() / deviceSize.height();
if (resultHeight == ViewportArguments::ValueAuto)
resultHeight = resultWidth * deviceSize.height() / deviceSize.width();
if (resultZoom != ViewportArguments::ValueAuto || resultMaxZoom != ViewportArguments::ValueAuto) {
resultWidth = compareIgnoringAuto(resultWidth, deviceSize.width() / compareIgnoringAuto(resultZoom, resultMaxZoom, std::min), std::max);
resultHeight = compareIgnoringAuto(resultHeight, deviceSize.height() / compareIgnoringAuto(resultZoom, resultMaxZoom, std::min), std::max);
}
resultWidth = std::max<float>(1, resultWidth);
resultHeight = std::max<float>(1, resultHeight);
}
if (type != ViewportArguments::CSSDeviceAdaptation && type != ViewportArguments::Implicit) {
// Clamp values to a valid range, but not for @viewport since is
// not mandated by the specification.
resultWidth = clampLengthValue(resultWidth);
resultHeight = clampLengthValue(resultHeight);
resultZoom = clampScaleValue(resultZoom);
resultMinZoom = clampScaleValue(resultMinZoom);
resultMaxZoom = clampScaleValue(resultMaxZoom);
}
ViewportAttributes result;
// Resolve minimum-scale and maximum-scale values according to spec.
if (resultMinZoom == ViewportArguments::ValueAuto)
result.minimumScale = float(0.25);
else
result.minimumScale = resultMinZoom;
if (resultMaxZoom == ViewportArguments::ValueAuto) {
result.maximumScale = 5;
result.minimumScale = std::min<float>(5, result.minimumScale);
} else
result.maximumScale = resultMaxZoom;
result.maximumScale = std::max(result.minimumScale, result.maximumScale);
// Resolve initial-scale value.
result.initialScale = resultZoom;
if (resultZoom == ViewportArguments::ValueAuto) {
result.initialScale = initialViewportSize.width() / defaultWidth;
if (resultWidth != ViewportArguments::ValueAuto)
result.initialScale = initialViewportSize.width() / resultWidth;
if (resultHeight != ViewportArguments::ValueAuto) {
// if 'auto', the initial-scale will be negative here and thus ignored.
result.initialScale = std::max<float>(result.initialScale, initialViewportSize.height() / resultHeight);
}
}
// Constrain initial-scale value to minimum-scale/maximum-scale range.
result.initialScale = std::min(result.maximumScale, std::max(result.minimumScale, result.initialScale));
// Resolve width value.
if (resultWidth == ViewportArguments::ValueAuto) {
if (resultZoom == ViewportArguments::ValueAuto)
resultWidth = defaultWidth;
else if (resultHeight != ViewportArguments::ValueAuto)
resultWidth = resultHeight * (initialViewportSize.width() / initialViewportSize.height());
else
resultWidth = initialViewportSize.width() / result.initialScale;
}
// Resolve height value.
if (resultHeight == ViewportArguments::ValueAuto)
resultHeight = resultWidth * (initialViewportSize.height() / initialViewportSize.width());
if (type == ViewportArguments::ViewportMeta) {
// Extend width and height to fill the visual viewport for the resolved initial-scale.
resultWidth = std::max<float>(resultWidth, initialViewportSize.width() / result.initialScale);
resultHeight = std::max<float>(resultHeight, initialViewportSize.height() / result.initialScale);
}
result.layoutSize.setWidth(resultWidth);
result.layoutSize.setHeight(resultHeight);
// FIXME: This might affect some ports, but is the right thing to do.
// Only set initialScale to a value if it was explicitly set.
// if (resultZoom == ViewportArguments::ValueAuto)
// result.initialScale = ViewportArguments::ValueAuto;
result.userScalable = userZoom;
result.orientation = orientation;
result.shrinkToFit = shrinkToFit;
result.viewportFit = viewportFit;
return result;
}
static FloatSize convertToUserSpace(const FloatSize& deviceSize, float devicePixelRatio)
{
FloatSize result = deviceSize;
if (devicePixelRatio != 1)
result.scale(1 / devicePixelRatio);
return result;
}
ViewportAttributes computeViewportAttributes(ViewportArguments args, int desktopWidth, int deviceWidth, int deviceHeight, float devicePixelRatio, IntSize visibleViewport)
{
FloatSize initialViewportSize = convertToUserSpace(visibleViewport, devicePixelRatio);
FloatSize deviceSize = convertToUserSpace(FloatSize(deviceWidth, deviceHeight), devicePixelRatio);
return args.resolve(initialViewportSize, deviceSize, desktopWidth);
}
float computeMinimumScaleFactorForContentContained(const ViewportAttributes& result, const IntSize& visibleViewport, const IntSize& contentsSize)
{
FloatSize viewportSize(visibleViewport);
return std::max<float>(result.minimumScale, std::max(viewportSize.width() / contentsSize.width(), viewportSize.height() / contentsSize.height()));
}
void restrictMinimumScaleFactorToViewportSize(ViewportAttributes& result, IntSize visibleViewport, float devicePixelRatio)
{
FloatSize viewportSize = convertToUserSpace(visibleViewport, devicePixelRatio);
result.minimumScale = std::max<float>(result.minimumScale, std::max(viewportSize.width() / result.layoutSize.width(), viewportSize.height() / result.layoutSize.height()));
}
void restrictScaleFactorToInitialScaleIfNotUserScalable(ViewportAttributes& result)
{
if (!result.userScalable)
result.maximumScale = result.minimumScale = result.initialScale;
}
static float numericPrefix(StringView key, StringView value, const InternalViewportErrorHandler& errorHandler, bool* ok = nullptr)
{
size_t parsedLength;
float numericValue;
if (value.is8Bit())
numericValue = charactersToFloat(value.characters8(), value.length(), parsedLength);
else
numericValue = charactersToFloat(value.characters16(), value.length(), parsedLength);
if (!parsedLength) {
errorHandler(UnrecognizedViewportArgumentValueError, value, key);
if (ok)
*ok = false;
return 0;
}
if (parsedLength < value.length())
errorHandler(TruncatedViewportArgumentValueError, value, key);
if (ok)
*ok = true;
return numericValue;
}
static float findSizeValue(StringView key, StringView value, const InternalViewportErrorHandler& errorHandler, bool* valueWasExplicit = nullptr)
{
// 1) Non-negative number values are translated to px lengths.
// 2) Negative number values are translated to auto.
// 3) device-width and device-height are used as keywords.
// 4) Other keywords and unknown values translate to 0.0.
if (valueWasExplicit)
*valueWasExplicit = true;
if (equalLettersIgnoringASCIICase(value, "device-width"))
return ViewportArguments::ValueDeviceWidth;
if (equalLettersIgnoringASCIICase(value, "device-height"))
return ViewportArguments::ValueDeviceHeight;
float sizeValue = numericPrefix(key, value, errorHandler);
if (sizeValue < 0) {
if (valueWasExplicit)
*valueWasExplicit = false;
return ViewportArguments::ValueAuto;
}
return sizeValue;
}
static float findScaleValue(StringView key, StringView value, const InternalViewportErrorHandler& errorHandler)
{
// 1) Non-negative number values are translated to <number> values.
// 2) Negative number values are translated to auto.
// 3) yes is translated to 1.0.
// 4) device-width and device-height are translated to 10.0.
// 5) no and unknown values are translated to 0.0
if (equalLettersIgnoringASCIICase(value, "yes"))
return 1;
if (equalLettersIgnoringASCIICase(value, "no"))
return 0;
if (equalLettersIgnoringASCIICase(value, "device-width"))
return 10;
if (equalLettersIgnoringASCIICase(value, "device-height"))
return 10;
float numericValue = numericPrefix(key, value, errorHandler);
if (numericValue < 0)
return ViewportArguments::ValueAuto;
if (numericValue > 10.0)
errorHandler(MaximumScaleTooLargeError, { }, { });
return numericValue;
}
static bool findBooleanValue(StringView key, StringView value, const InternalViewportErrorHandler& errorHandler)
{
// yes and no are used as keywords.
// Numbers >= 1, numbers <= -1, device-width and device-height are mapped to yes.
// Numbers in the range <-1, 1>, and unknown values, are mapped to no.
if (equalLettersIgnoringASCIICase(value, "yes"))
return true;
if (equalLettersIgnoringASCIICase(value, "no"))
return false;
if (equalLettersIgnoringASCIICase(value, "device-width"))
return true;
if (equalLettersIgnoringASCIICase(value, "device-height"))
return true;
return std::abs(numericPrefix(key, value, errorHandler)) >= 1;
}
static ViewportFit parseViewportFitValue(StringView key, StringView value, const InternalViewportErrorHandler& errorHandler)
{
if (equalLettersIgnoringASCIICase(value, "auto"))
return ViewportFit::Auto;
if (equalLettersIgnoringASCIICase(value, "contain"))
return ViewportFit::Contain;
if (equalLettersIgnoringASCIICase(value, "cover"))
return ViewportFit::Cover;
errorHandler(UnrecognizedViewportArgumentValueError, value, key);
return ViewportFit::Auto;
}
static const char* viewportErrorMessageTemplate(ViewportErrorCode errorCode)
{
static const char* const errors[] = {
"Viewport argument key \"%replacement1\" not recognized and ignored.",
"Viewport argument value \"%replacement1\" for key \"%replacement2\" is invalid, and has been ignored.",
"Viewport argument value \"%replacement1\" for key \"%replacement2\" was truncated to its numeric prefix.",
"Viewport maximum-scale cannot be larger than 10.0. The maximum-scale will be set to 10.0."
};
return errors[errorCode];
}
static MessageLevel viewportErrorMessageLevel(ViewportErrorCode errorCode)
{
switch (errorCode) {
case TruncatedViewportArgumentValueError:
return MessageLevel::Warning;
case UnrecognizedViewportArgumentKeyError:
case UnrecognizedViewportArgumentValueError:
case MaximumScaleTooLargeError:
return MessageLevel::Error;
}
ASSERT_NOT_REACHED();
return MessageLevel::Error;
}
static String viewportErrorMessage(ViewportErrorCode errorCode, StringView replacement1, StringView replacement2)
{
String message = viewportErrorMessageTemplate(errorCode);
if (!replacement1.isNull())
message.replace("%replacement1", replacement1.toStringWithoutCopying());
// FIXME: This will do the wrong thing if replacement1 contains the substring "%replacement2".
if (!replacement2.isNull())
message.replace("%replacement2", replacement2.toStringWithoutCopying());
if ((errorCode == UnrecognizedViewportArgumentValueError || errorCode == TruncatedViewportArgumentValueError) && replacement1.contains(';'))
message.append(" Note that ';' is not a separator in viewport values. The list should be comma-separated.");
return message;
}
static void reportViewportWarning(Document& document, ViewportErrorCode errorCode, const String& message)
{
// FIXME: Why is this null check needed? Can't addConsoleMessage deal with this?
if (!document.frame())
return;
// FIXME: This message should be moved off the console once a solution to https://bugs.webkit.org/show_bug.cgi?id=103274 exists.
document.addConsoleMessage(MessageSource::Rendering, viewportErrorMessageLevel(errorCode), message);
}
void setViewportFeature(ViewportArguments& arguments, StringView key, StringView value, bool viewportFitEnabled, const ViewportErrorHandler& errorHandler)
{
InternalViewportErrorHandler internalErrorHandler = [&errorHandler] (ViewportErrorCode errorCode, StringView replacement1, StringView replacement2) {
errorHandler(errorCode, viewportErrorMessage(errorCode, replacement1, replacement2));
};
if (equalLettersIgnoringASCIICase(key, "width"))
arguments.width = findSizeValue(key, value, internalErrorHandler, &arguments.widthWasExplicit);
else if (equalLettersIgnoringASCIICase(key, "height"))
arguments.height = findSizeValue(key, value, internalErrorHandler);
else if (equalLettersIgnoringASCIICase(key, "initial-scale"))
arguments.zoom = findScaleValue(key, value, internalErrorHandler);
else if (equalLettersIgnoringASCIICase(key, "minimum-scale"))
arguments.minZoom = findScaleValue(key, value, internalErrorHandler);
else if (equalLettersIgnoringASCIICase(key, "maximum-scale"))
arguments.maxZoom = findScaleValue(key, value, internalErrorHandler);
else if (equalLettersIgnoringASCIICase(key, "user-scalable"))
arguments.userZoom = findBooleanValue(key, value, internalErrorHandler);
#if PLATFORM(IOS_FAMILY)
else if (equalLettersIgnoringASCIICase(key, "minimal-ui")) {
// FIXME: Ignore silently for now. This code should eventually be removed
// so we start giving the warning in the web inspector as for other unimplemented keys.
}
#endif
else if (equalLettersIgnoringASCIICase(key, "shrink-to-fit"))
arguments.shrinkToFit = findBooleanValue(key, value, internalErrorHandler);
else if (equalLettersIgnoringASCIICase(key, "viewport-fit") && viewportFitEnabled)
arguments.viewportFit = parseViewportFitValue(key, value, internalErrorHandler);
else
internalErrorHandler(UnrecognizedViewportArgumentKeyError, key, { });
}
void setViewportFeature(ViewportArguments& arguments, Document& document, StringView key, StringView value)
{
setViewportFeature(arguments, key, value, document.settings().viewportFitEnabled(), [&](ViewportErrorCode errorCode, const String& message) {
reportViewportWarning(document, errorCode, message);
});
}
TextStream& operator<<(TextStream& ts, const ViewportArguments& viewportArguments)
{
TextStream::IndentScope indentScope(ts);
ts << "\n" << indent << "(width " << viewportArguments.width << ", minWidth " << viewportArguments.minWidth << ", maxWidth " << viewportArguments.maxWidth << ")";
ts << "\n" << indent << "(height " << viewportArguments.height << ", minHeight " << viewportArguments.minHeight << ", maxHeight " << viewportArguments.maxHeight << ")";
ts << "\n" << indent << "(zoom " << viewportArguments.zoom << ", minZoom " << viewportArguments.minZoom << ", maxZoom " << viewportArguments.maxZoom << ")";
return ts;
}
} // namespace WebCore