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MediaQueryEvaluator.cpp
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MediaQueryEvaluator.cpp
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/*
* CSS Media Query Evaluator
*
* Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "MediaQueryEvaluator.h"
#include "CSSAspectRatioValue.h"
#include "CSSPrimitiveValue.h"
#include "CSSToLengthConversionData.h"
#include "CSSValueKeywords.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "DocumentLoader.h"
#include "Frame.h"
#include "FrameView.h"
#include "Logging.h"
#include "MediaFeatureNames.h"
#include "MediaList.h"
#include "MediaQuery.h"
#include "MediaQueryParserContext.h"
#include "NodeRenderStyle.h"
#include "Page.h"
#include "PlatformScreen.h"
#include "Quirks.h"
#include "RenderStyle.h"
#include "RenderView.h"
#include "Settings.h"
#include "StyleFontSizeFunctions.h"
#include "Theme.h"
#include <wtf/HashMap.h>
#include <wtf/text/StringConcatenateNumbers.h>
#include <wtf/text/TextStream.h>
#if ENABLE(3D_TRANSFORMS)
#include "RenderLayerCompositor.h"
#endif
namespace WebCore {
enum MediaFeaturePrefix { MinPrefix, MaxPrefix, NoPrefix };
#ifndef LOG_DISABLED
static TextStream& operator<<(TextStream& ts, MediaFeaturePrefix op)
{
switch (op) {
case MinPrefix: ts << "min"; break;
case MaxPrefix: ts << "max"; break;
case NoPrefix: ts << ""; break;
}
return ts;
}
#endif
typedef bool (*MediaQueryFunction)(CSSValue*, const CSSToLengthConversionData&, Frame&, MediaFeaturePrefix);
typedef HashMap<AtomStringImpl*, MediaQueryFunction> MediaQueryFunctionMap;
static bool isAccessibilitySettingsDependent(const AtomString& mediaFeature)
{
return mediaFeature == MediaFeatureNames::invertedColors
|| mediaFeature == MediaFeatureNames::maxMonochrome
|| mediaFeature == MediaFeatureNames::minMonochrome
|| mediaFeature == MediaFeatureNames::monochrome
|| mediaFeature == MediaFeatureNames::prefersReducedMotion
|| mediaFeature == MediaFeatureNames::prefersContrast;
}
static bool isAppearanceDependent(const AtomString& mediaFeature)
{
return mediaFeature == MediaFeatureNames::prefersDarkInterface
#if ENABLE(DARK_MODE_CSS)
|| mediaFeature == MediaFeatureNames::prefersColorScheme
#endif
;
}
MediaQueryViewportState mediaQueryViewportStateForDocument(const Document& document)
{
// These things affect evaluation of viewport dependent media queries.
return { document.view()->layoutSize(), document.frame()->pageZoomFactor(), document.printing() };
}
MediaQueryEvaluator::MediaQueryEvaluator(bool mediaFeatureResult)
: m_fallbackResult(mediaFeatureResult)
{
}
MediaQueryEvaluator::MediaQueryEvaluator(const String& acceptedMediaType, bool mediaFeatureResult)
: m_mediaType(acceptedMediaType)
, m_fallbackResult(mediaFeatureResult)
{
}
MediaQueryEvaluator::MediaQueryEvaluator(const String& acceptedMediaType, const Document& document, const RenderStyle* style)
: m_mediaType(acceptedMediaType)
, m_document(document)
, m_style(style)
{
}
bool MediaQueryEvaluator::mediaTypeMatch(const String& mediaTypeToMatch) const
{
return mediaTypeToMatch.isEmpty()
|| equalLettersIgnoringASCIICase(mediaTypeToMatch, "all"_s)
|| equalIgnoringASCIICase(mediaTypeToMatch, m_mediaType);
}
bool MediaQueryEvaluator::mediaTypeMatchSpecific(ASCIILiteral mediaTypeToMatch) const
{
// Like mediaTypeMatch, but without the special cases for "" and "all".
ASSERT(!mediaTypeToMatch.isNull());
ASSERT(mediaTypeToMatch.characterAt(0) != '\0');
ASSERT(!equalLettersIgnoringASCIICase(mediaTypeToMatch, "all"_s));
return equalIgnoringASCIICase(m_mediaType, mediaTypeToMatch);
}
static bool applyRestrictor(MediaQuery::Restrictor r, bool value)
{
return r == MediaQuery::Not ? !value : value;
}
bool MediaQueryEvaluator::evaluate(const MediaQuerySet& querySet, MediaQueryDynamicResults* dynamicResults, Mode mode) const
{
LOG_WITH_STREAM(MediaQueries, stream << "MediaQueryEvaluator::evaluate on " << (m_document ? m_document->url().string() : emptyString()));
auto& queries = querySet.queryVector();
if (!queries.size()) {
LOG_WITH_STREAM(MediaQueries, stream << "MediaQueryEvaluator::evaluate " << querySet << " returning true");
return true; // Empty query list evaluates to true.
}
// Iterate over queries, stop if any of them eval to true (OR semantics).
bool result = false;
for (size_t i = 0; i < queries.size() && !result; ++i) {
auto& query = queries[i];
if (query.ignored() || (!query.expressions().size() && query.mediaType().isEmpty()))
continue;
if (mediaTypeMatch(query.mediaType())) {
auto& expressions = query.expressions();
// Iterate through expressions, stop if any of them eval to false (AND semantics).
bool isDynamic = false;
size_t j = 0;
for (; j < expressions.size(); ++j) {
bool expressionResult = evaluate(expressions[j]);
if (dynamicResults) {
if (expressions[j].isViewportDependent()) {
isDynamic = true;
dynamicResults->viewport.append({ expressions[j], expressionResult });
}
if (isAppearanceDependent(expressions[j].mediaFeature())) {
isDynamic = true;
dynamicResults->appearance.append({ expressions[j], expressionResult });
}
if (isAccessibilitySettingsDependent(expressions[j].mediaFeature())) {
isDynamic = true;
dynamicResults->accessibilitySettings.append({ expressions[j], expressionResult });
}
}
if (mode == Mode::AlwaysMatchDynamic && isDynamic)
continue;
if (!expressionResult)
break;
}
if (mode == Mode::AlwaysMatchDynamic && isDynamic) {
result = true;
continue;
}
// Assume true if we are at the end of the list, otherwise assume false.
result = applyRestrictor(query.restrictor(), expressions.size() == j);
} else
result = applyRestrictor(query.restrictor(), false);
}
LOG_WITH_STREAM(MediaQueries, stream << "MediaQueryEvaluator::evaluate " << querySet << " returning " << result);
return result;
}
bool MediaQueryEvaluator::evaluateForChanges(const MediaQueryDynamicResults& dynamicResults) const
{
auto hasChanges = [&](auto& dynamicResultsVector) {
for (auto& dynamicResult : dynamicResultsVector) {
if (evaluate(dynamicResult.expression) != dynamicResult.result)
return true;
}
return false;
};
return hasChanges(dynamicResults.viewport) || hasChanges(dynamicResults.appearance) || hasChanges(dynamicResults.accessibilitySettings);
}
template<typename T, typename U> bool compareValue(T a, U b, MediaFeaturePrefix op)
{
switch (op) {
case MinPrefix:
return a >= b;
case MaxPrefix:
return a <= b;
case NoPrefix:
return a == b;
}
return false;
}
#if !LOG_DISABLED
static String aspectRatioValueAsString(CSSValue* value)
{
if (!is<CSSAspectRatioValue>(value))
return emptyString();
auto& aspectRatio = downcast<CSSAspectRatioValue>(*value);
return makeString(aspectRatio.numeratorValue(), '/', aspectRatio.denominatorValue());
}
#endif
static bool compareAspectRatioValue(CSSValue* value, int width, int height, MediaFeaturePrefix op)
{
if (!is<CSSAspectRatioValue>(value))
return false;
auto& aspectRatio = downcast<CSSAspectRatioValue>(*value);
return compareValue(width * aspectRatio.denominatorValue(), height * aspectRatio.numeratorValue(), op);
}
static std::optional<double> doubleValue(CSSValue* value)
{
if (!is<CSSPrimitiveValue>(value) || !downcast<CSSPrimitiveValue>(*value).isNumberOrInteger())
return std::nullopt;
return downcast<CSSPrimitiveValue>(*value).doubleValue(CSSUnitType::CSS_NUMBER);
}
static bool zeroEvaluate(CSSValue* value, MediaFeaturePrefix op)
{
auto numericValue = doubleValue(value);
return numericValue && compareValue(0, numericValue.value(), op);
}
static bool oneEvaluate(CSSValue* value, MediaFeaturePrefix op)
{
if (!value)
return true;
auto numericValue = doubleValue(value);
return numericValue && compareValue(1, numericValue.value(), op);
}
static bool colorEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix op)
{
int bitsPerComponent = screenDepthPerComponent(frame.mainFrame().view());
auto numericValue = doubleValue(value);
if (!numericValue)
return bitsPerComponent;
return compareValue(bitsPerComponent, numericValue.value(), op);
}
static bool colorIndexEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame&, MediaFeaturePrefix op)
{
// Always return false for indexed display.
return zeroEvaluate(value, op);
}
static bool colorGamutEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
if (!value)
return true;
switch (downcast<CSSPrimitiveValue>(*value).valueID()) {
case CSSValueSRGB:
return true;
case CSSValueP3:
// FIXME: For the moment we just assume any "extended color" display is at least as good as P3.
return screenSupportsExtendedColor(frame.mainFrame().view());
case CSSValueRec2020:
// FIXME: At some point we should start detecting displays that support more colors.
return false;
default:
return false; // Any unknown value should not be considered a match.
}
}
static bool monochromeEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix op)
{
bool isMonochrome;
if (frame.settings().forcedDisplayIsMonochromeAccessibilityValue() == ForcedAccessibilityValue::On)
isMonochrome = true;
else if (frame.settings().forcedDisplayIsMonochromeAccessibilityValue() == ForcedAccessibilityValue::Off)
isMonochrome = false;
else
isMonochrome = screenIsMonochrome(frame.mainFrame().view());
if (!isMonochrome)
return zeroEvaluate(value, op);
return colorEvaluate(value, conversionData, frame, op);
}
static bool invertedColorsEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
bool isInverted;
if (frame.settings().forcedColorsAreInvertedAccessibilityValue() == ForcedAccessibilityValue::On)
isInverted = true;
else if (frame.settings().forcedColorsAreInvertedAccessibilityValue() == ForcedAccessibilityValue::Off)
isInverted = false;
else
isInverted = screenHasInvertedColors();
if (!value)
return isInverted;
return downcast<CSSPrimitiveValue>(*value).valueID() == (isInverted ? CSSValueInverted : CSSValueNone);
}
static bool orientationEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
FrameView* view = frame.view();
if (!view)
return false;
auto width = view->layoutWidth();
auto height = view->layoutHeight();
if (!is<CSSPrimitiveValue>(value)) {
// Expression (orientation) evaluates to true if width and height >= 0.
return height >= 0 && width >= 0;
}
auto keyword = downcast<CSSPrimitiveValue>(*value).valueID();
bool result;
if (width > height) // Square viewport is portrait.
result = keyword == CSSValueLandscape;
else
result = keyword == CSSValuePortrait;
LOG_WITH_STREAM(MediaQueries, stream << " orientationEvaluate: view size " << width << "x" << height << " is " << value->cssText() << ": " << result);
return result;
}
static bool aspectRatioEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix op)
{
// ({,min-,max-}aspect-ratio)
// assume if we have a device, its aspect ratio is non-zero
if (!value)
return true;
FrameView* view = frame.view();
if (!view)
return true;
bool result = compareAspectRatioValue(value, view->layoutWidth(), view->layoutHeight(), op);
LOG_WITH_STREAM(MediaQueries, stream << " aspectRatioEvaluate: " << op << " " << aspectRatioValueAsString(value) << " actual view size " << view->layoutWidth() << "x" << view->layoutHeight() << " : " << result);
return result;
}
static bool deviceAspectRatioEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix op)
{
// ({,min-,max-}device-aspect-ratio)
// assume if we have a device, its aspect ratio is non-zero
if (!value)
return true;
auto size = frame.mainFrame().screenSize();
bool result = compareAspectRatioValue(value, size.width(), size.height(), op);
LOG_WITH_STREAM(MediaQueries, stream << " deviceAspectRatioEvaluate: " << op << " " << aspectRatioValueAsString(value) << " actual screen size " << size << ": " << result);
return result;
}
static bool evaluateResolution(CSSValue* value, Frame& frame, MediaFeaturePrefix op)
{
// FIXME: Possible handle other media types than 'screen' and 'print'.
FrameView* view = frame.view();
if (!view)
return false;
float deviceScaleFactor = 0;
// This checks the actual media type applied to the document, and we know
// this method only got called if this media type matches the one defined
// in the query. Thus, if if the document's media type is "print", the
// media type of the query will either be "print" or "all".
String mediaType = view->mediaType();
if (equalLettersIgnoringASCIICase(mediaType, "screen"_s))
deviceScaleFactor = frame.page() ? frame.page()->deviceScaleFactor() : 1;
else if (equalLettersIgnoringASCIICase(mediaType, "print"_s)) {
// The resolution of images while printing should not depend on the dpi
// of the screen. Until we support proper ways of querying this info
// we use 300px which is considered minimum for current printers.
deviceScaleFactor = 3.125; // 300dpi / 96dpi;
}
if (!value)
return !!deviceScaleFactor;
if (!is<CSSPrimitiveValue>(value))
return false;
auto& resolution = downcast<CSSPrimitiveValue>(*value);
float resolutionValue = resolution.isNumberOrInteger() ? resolution.floatValue() : resolution.floatValue(CSSUnitType::CSS_DPPX);
bool result = compareValue(deviceScaleFactor, resolutionValue, op);
LOG_WITH_STREAM(MediaQueries, stream << " evaluateResolution: " << op << " " << resolutionValue << " device scale factor " << deviceScaleFactor << ": " << result);
return result;
}
static bool devicePixelRatioEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix op)
{
return (!value || (is<CSSPrimitiveValue>(*value) && downcast<CSSPrimitiveValue>(*value).isNumberOrInteger())) && evaluateResolution(value, frame, op);
}
static bool resolutionEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix op)
{
if (!frame.settings().resolutionMediaFeatureEnabled() || frame.document()->quirks().shouldDisableResolutionMediaQuery())
return false;
return (!value || (is<CSSPrimitiveValue>(*value) && downcast<CSSPrimitiveValue>(*value).isResolution())) && evaluateResolution(value, frame, op);
}
static bool dynamicRangeEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
if (!value)
return false;
if (!frame.settings().hdrMediaCapabilitiesEnabled())
return false;
bool supportsHighDynamicRange;
if (frame.settings().forcedSupportsHighDynamicRangeValue() == ForcedAccessibilityValue::On)
supportsHighDynamicRange = true;
else if (frame.settings().forcedSupportsHighDynamicRangeValue() == ForcedAccessibilityValue::Off)
supportsHighDynamicRange = false;
else
supportsHighDynamicRange = screenSupportsHighDynamicRange(frame.mainFrame().view());
switch (downcast<CSSPrimitiveValue>(*value).valueID()) {
case CSSValueHigh:
return supportsHighDynamicRange;
case CSSValueStandard:
return true;
default:
return false; // Any unknown value should not be considered a match.
}
}
static bool scanEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
RefPtr view = frame.view();
if (!view)
return false;
/* With Media Queries Level 4, the "tv" media type is deprecated
* and the "scan" feature applies to all media types.
* We are currently supporting Media Queries Level 3,
* thus the check against "tv".
*/
if (!equalLettersIgnoringASCIICase(view->mediaType(), "tv"_s))
return false;
auto* primitiveValue = dynamicDowncast<CSSPrimitiveValue>(value);
if (!primitiveValue)
return false;
// All known implementations (Blink, Gecko) assume and match "progressive".
return primitiveValue->valueID() == CSSValueProgressive;
}
static bool forcedColorsEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame&, MediaFeaturePrefix)
{
auto* primitiveValue = dynamicDowncast<CSSPrimitiveValue>(value);
if (!primitiveValue)
return false;
// On Cocoa platforms, there is no concept of "forced colors".
return primitiveValue->valueID() == CSSValueNone;
}
static bool gridEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame&, MediaFeaturePrefix op)
{
return zeroEvaluate(value, op);
}
static std::optional<double> computeLength(CSSValue* value, bool strict, const CSSToLengthConversionData& conversionData)
{
if (!is<CSSPrimitiveValue>(value))
return std::nullopt;
auto& primitiveValue = downcast<CSSPrimitiveValue>(*value);
if (primitiveValue.isNumberOrInteger()) {
double value = primitiveValue.doubleValue();
// The only unitless number value allowed in strict mode is zero.
if (strict && value)
return std::nullopt;
return value;
}
if (primitiveValue.isLength())
return primitiveValue.computeLength<double>(conversionData);
return std::nullopt;
}
static bool deviceHeightEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix op)
{
// ({,min-,max-}device-height)
// assume if we have a device, assume non-zero
if (!value)
return true;
auto length = computeLength(value, !frame.document()->inQuirksMode(), conversionData);
if (!length)
return false;
auto height = frame.mainFrame().screenSize().height();
LOG_WITH_STREAM(MediaQueries, stream << " deviceHeightEvaluate: query " << op << " height " << *length << ", actual height " << height << " result: " << compareValue(height, *length, op));
return compareValue(height, *length, op);
}
static bool deviceWidthEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix op)
{
// ({,min-,max-}device-width)
// assume if we have a device, assume non-zero
if (!value)
return true;
auto length = computeLength(value, !frame.document()->inQuirksMode(), conversionData);
if (!length)
return false;
auto width = frame.mainFrame().screenSize().width();
LOG_WITH_STREAM(MediaQueries, stream << " deviceWidthEvaluate: query " << op << " width " << *length << ", actual width " << width << " result: " << compareValue(width, *length, op));
return compareValue(width, *length, op);
}
static bool heightEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix op)
{
FrameView* view = frame.view();
if (!view)
return false;
int height = view->layoutHeight();
if (!value)
return height;
auto length = computeLength(value, !frame.document()->inQuirksMode(), conversionData);
if (!length)
return false;
if (auto* renderView = frame.document()->renderView())
height = adjustForAbsoluteZoom(height, *renderView);
LOG_WITH_STREAM(MediaQueries, stream << " heightEvaluate: query " << op << " height " << *length << ", actual height " << height << " result: " << compareValue(height, *length, op));
return compareValue(height, *length, op);
}
static bool widthEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix op)
{
FrameView* view = frame.view();
if (!view)
return false;
int width = view->layoutWidth();
if (!value)
return width;
auto length = computeLength(value, !frame.document()->inQuirksMode(), conversionData);
if (!length)
return false;
if (auto* renderView = frame.document()->renderView())
width = adjustForAbsoluteZoom(width, *renderView);
LOG_WITH_STREAM(MediaQueries, stream << " widthEvaluate: query " << op << " width " << *length << ", actual width " << width << " result: " << compareValue(width, *length, op));
return compareValue(width, *length, op);
}
static bool minColorEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return colorEvaluate(value, conversionData, frame, MinPrefix);
}
static bool maxColorEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return colorEvaluate(value, conversionData, frame, MaxPrefix);
}
static bool minColorIndexEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return colorIndexEvaluate(value, conversionData, frame, MinPrefix);
}
static bool maxColorIndexEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return colorIndexEvaluate(value, conversionData, frame, MaxPrefix);
}
static bool minMonochromeEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return monochromeEvaluate(value, conversionData, frame, MinPrefix);
}
static bool maxMonochromeEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return monochromeEvaluate(value, conversionData, frame, MaxPrefix);
}
static bool minAspectRatioEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return aspectRatioEvaluate(value, conversionData, frame, MinPrefix);
}
static bool maxAspectRatioEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return aspectRatioEvaluate(value, conversionData, frame, MaxPrefix);
}
static bool minDeviceAspectRatioEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return deviceAspectRatioEvaluate(value, conversionData, frame, MinPrefix);
}
static bool maxDeviceAspectRatioEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return deviceAspectRatioEvaluate(value, conversionData, frame, MaxPrefix);
}
static bool minDevicePixelRatioEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return devicePixelRatioEvaluate(value, conversionData, frame, MinPrefix);
}
static bool maxDevicePixelRatioEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return devicePixelRatioEvaluate(value, conversionData, frame, MaxPrefix);
}
static bool minHeightEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return heightEvaluate(value, conversionData, frame, MinPrefix);
}
static bool maxHeightEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return heightEvaluate(value, conversionData, frame, MaxPrefix);
}
static bool minWidthEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return widthEvaluate(value, conversionData, frame, MinPrefix);
}
static bool maxWidthEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return widthEvaluate(value, conversionData, frame, MaxPrefix);
}
static bool minDeviceHeightEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return deviceHeightEvaluate(value, conversionData, frame, MinPrefix);
}
static bool maxDeviceHeightEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return deviceHeightEvaluate(value, conversionData, frame, MaxPrefix);
}
static bool minDeviceWidthEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return deviceWidthEvaluate(value, conversionData, frame, MinPrefix);
}
static bool maxDeviceWidthEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return deviceWidthEvaluate(value, conversionData, frame, MaxPrefix);
}
static bool minResolutionEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return resolutionEvaluate(value, conversionData, frame, MinPrefix);
}
static bool maxResolutionEvaluate(CSSValue* value, const CSSToLengthConversionData& conversionData, Frame& frame, MediaFeaturePrefix)
{
return resolutionEvaluate(value, conversionData, frame, MaxPrefix);
}
static bool animationEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame&, MediaFeaturePrefix op)
{
return oneEvaluate(value, op);
}
static bool transitionEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame&, MediaFeaturePrefix op)
{
return oneEvaluate(value, op);
}
static bool transform2dEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame&, MediaFeaturePrefix op)
{
return oneEvaluate(value, op);
}
static bool transform3dEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix op)
{
#if ENABLE(3D_TRANSFORMS)
auto* view = frame.contentRenderer();
return view && view->compositor().canRender3DTransforms() ? oneEvaluate(value, op) : zeroEvaluate(value, op);
#else
UNUSED_PARAM(frame);
return zeroEvaluate(value, op);
#endif
}
static bool videoPlayableInlineEvaluate(CSSValue*, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
return frame.settings().allowsInlineMediaPlayback();
}
static bool hoverEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
auto* page = frame.page();
bool hoverSupportedByPrimaryPointingDevice = page && page->chrome().client().hoverSupportedByPrimaryPointingDevice();
if (!is<CSSPrimitiveValue>(value))
return hoverSupportedByPrimaryPointingDevice;
auto keyword = downcast<CSSPrimitiveValue>(*value).valueID();
return hoverSupportedByPrimaryPointingDevice ? (keyword == CSSValueHover) : (keyword == CSSValueNone);
}
static bool anyHoverEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
auto* page = frame.page();
bool hoverSupportedByAnyAvailablePointingDevice = page && page->chrome().client().hoverSupportedByAnyAvailablePointingDevice();
if (!is<CSSPrimitiveValue>(value))
return hoverSupportedByAnyAvailablePointingDevice;
auto keyword = downcast<CSSPrimitiveValue>(*value).valueID();
return hoverSupportedByAnyAvailablePointingDevice ? (keyword == CSSValueHover) : (keyword == CSSValueNone);
}
static bool pointerEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
auto* page = frame.page();
auto pointerCharacteristicsOfPrimaryPointingDevice = page ? page->chrome().client().pointerCharacteristicsOfPrimaryPointingDevice() : std::optional<PointerCharacteristics>();
#if ENABLE(TOUCH_EVENTS)
if (pointerCharacteristicsOfPrimaryPointingDevice == PointerCharacteristics::Coarse) {
auto* document = frame.document();
if (document && document->quirks().shouldPreventPointerMediaQueryFromEvaluatingToCoarse())
pointerCharacteristicsOfPrimaryPointingDevice = PointerCharacteristics::Fine;
}
#endif
if (!is<CSSPrimitiveValue>(value))
return !!pointerCharacteristicsOfPrimaryPointingDevice;
auto keyword = downcast<CSSPrimitiveValue>(*value).valueID();
if (keyword == CSSValueFine)
return pointerCharacteristicsOfPrimaryPointingDevice == PointerCharacteristics::Fine;
if (keyword == CSSValueCoarse)
return pointerCharacteristicsOfPrimaryPointingDevice == PointerCharacteristics::Coarse;
if (keyword == CSSValueNone)
return !pointerCharacteristicsOfPrimaryPointingDevice;
return false;
}
static bool anyPointerEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
auto* page = frame.page();
auto pointerCharacteristicsOfAllAvailablePointingDevices = page ? page->chrome().client().pointerCharacteristicsOfAllAvailablePointingDevices() : OptionSet<PointerCharacteristics>();
if (!is<CSSPrimitiveValue>(value))
return !pointerCharacteristicsOfAllAvailablePointingDevices.isEmpty();
auto keyword = downcast<CSSPrimitiveValue>(*value).valueID();
if (keyword == CSSValueFine)
return pointerCharacteristicsOfAllAvailablePointingDevices.contains(PointerCharacteristics::Fine);
if (keyword == CSSValueCoarse)
return pointerCharacteristicsOfAllAvailablePointingDevices.contains(PointerCharacteristics::Coarse);
if (keyword == CSSValueNone)
return pointerCharacteristicsOfAllAvailablePointingDevices.isEmpty();
return false;
}
static bool prefersDarkInterfaceEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
bool prefersDarkInterface = false;
if (frame.page()->useSystemAppearance() && frame.page()->useDarkAppearance())
prefersDarkInterface = true;
if (!value)
return prefersDarkInterface;
return downcast<CSSPrimitiveValue>(*value).valueID() == (prefersDarkInterface ? CSSValuePrefers : CSSValueNoPreference);
}
#if ENABLE(DARK_MODE_CSS)
static bool prefersColorSchemeEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
if (!value)
return true;
if (!is<CSSPrimitiveValue>(value))
return false;
auto keyword = downcast<CSSPrimitiveValue>(*value).valueID();
bool useDarkAppearance = [&] () -> auto {
if (frame.document()->loader()) {
auto colorSchemePreference = frame.document()->loader()->colorSchemePreference();
if (colorSchemePreference != ColorSchemePreference::NoPreference)
return colorSchemePreference == ColorSchemePreference::Dark;
}
return frame.page()->useDarkAppearance();
}();
switch (keyword) {
case CSSValueDark:
return useDarkAppearance;
case CSSValueLight:
return !useDarkAppearance;
default:
return false;
}
}
#endif
static bool prefersContrastEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
bool userPrefersContrast = false;
switch (frame.settings().forcedPrefersContrastAccessibilityValue()) {
case ForcedAccessibilityValue::On:
userPrefersContrast = true;
break;
case ForcedAccessibilityValue::Off:
break;
case ForcedAccessibilityValue::System:
#if PLATFORM(MAC) || PLATFORM(IOS_FAMILY)
userPrefersContrast = Theme::singleton().userPrefersContrast();
#endif
break;
}
if (!value)
return userPrefersContrast;
// Apple platforms: "less" is ignored and only "more" is mapped to the user's preference.
return downcast<CSSPrimitiveValue>(*value).valueID() == (userPrefersContrast ? CSSValueMore : CSSValueNoPreference);
}
static bool prefersReducedMotionEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
bool userPrefersReducedMotion = false;
switch (frame.settings().forcedPrefersReducedMotionAccessibilityValue()) {
case ForcedAccessibilityValue::On:
userPrefersReducedMotion = true;
break;
case ForcedAccessibilityValue::Off:
break;
case ForcedAccessibilityValue::System:
#if USE(NEW_THEME) || PLATFORM(IOS_FAMILY)
userPrefersReducedMotion = Theme::singleton().userPrefersReducedMotion();
#endif
break;
}
if (!value)
return userPrefersReducedMotion;
return downcast<CSSPrimitiveValue>(*value).valueID() == (userPrefersReducedMotion ? CSSValueReduce : CSSValueNoPreference);
}
#if ENABLE(APPLICATION_MANIFEST)
static bool displayModeEvaluate(CSSValue* value, const CSSToLengthConversionData&, Frame& frame, MediaFeaturePrefix)
{
if (!value)
return true;
auto keyword = downcast<CSSPrimitiveValue>(*value).valueID();
auto manifest = frame.page() ? frame.page()->applicationManifest() : std::nullopt;
if (!manifest)
return keyword == CSSValueBrowser;
switch (manifest->display) {
case ApplicationManifest::Display::Fullscreen:
return keyword == CSSValueFullscreen;
case ApplicationManifest::Display::Standalone:
return keyword == CSSValueStandalone;
case ApplicationManifest::Display::MinimalUI:
return keyword == CSSValueMinimalUi;
case ApplicationManifest::Display::Browser:
return keyword == CSSValueBrowser;
}
return false;
}
#endif // ENABLE(APPLICATION_MANIFEST)
// Use this function instead of calling add directly to avoid inlining.
static void add(MediaQueryFunctionMap& map, AtomStringImpl* key, MediaQueryFunction value)
{
map.add(key, value);
}
bool MediaQueryEvaluator::evaluate(const MediaQueryExpression& expression) const
{
if (!m_document)
return m_fallbackResult;
auto& document = *m_document;
auto* frame = document.frame();
if (!frame || !frame->view() || !m_style)
return m_fallbackResult;
if (!expression.isValid())
return false;
static NeverDestroyed<MediaQueryFunctionMap> map = [] {
MediaQueryFunctionMap map;
#define ADD_TO_FUNCTIONMAP(name, str) add(map, MediaFeatureNames::name->impl(), name##Evaluate);
CSS_MEDIAQUERY_NAMES_FOR_EACH_MEDIAFEATURE(ADD_TO_FUNCTIONMAP);
#undef ADD_TO_FUNCTIONMAP
return map;
}();
auto function = map.get().get(expression.mediaFeature().impl());
if (!function)
return false;
if (!document.documentElement())
return false;
auto defaultStyle = RenderStyle::create();
auto fontDescription = defaultStyle.fontDescription();
auto size = Style::fontSizeForKeyword(CSSValueMedium, false, document);
fontDescription.setComputedSize(size);
fontDescription.setSpecifiedSize(size);
defaultStyle.setFontDescription(WTFMove(fontDescription));
defaultStyle.fontCascade().update();
// Pass `nullptr` for `parentStyle` because we are in the context of a media query.
return function(expression.value(), { *m_style, &defaultStyle, nullptr, document.renderView() }, *frame, NoPrefix);
}
bool MediaQueryEvaluator::mediaAttributeMatches(Document& document, const String& attributeValue)
{
ASSERT(document.renderView());
auto mediaQueries = MediaQuerySet::create(attributeValue, MediaQueryParserContext(document));
return MediaQueryEvaluator { "screen"_s, document, &document.renderView()->style() }.evaluate(mediaQueries.get());
}
} // WebCore