Enable Media query evaluation in the preload scanner

Source/core/css/MediaQueryEvaluator.cpp

 /*
  * CSS Media Query Evaluator
  *
  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ skipping 28 matching lines @@
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSToLengthConversionData.h"
 #include "core/css/MediaList.h"
 #include "core/css/MediaQuery.h"
 #include "core/css/resolver/MediaQueryResult.h"
 #include "core/dom/NodeRenderStyle.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
+#include "core/html/imports/HTMLImport.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/compositing/RenderLayerCompositor.h"
 #include "core/rendering/style/RenderStyle.h"
 #include "platform/PlatformScreen.h"
 #include "platform/geometry/FloatRect.h"
 #include "wtf/HashMap.h"
 
 namespace WebCore {
 
 using namespace MediaFeatureNames;
 
 enum MediaFeaturePrefix { MinPrefix, MaxPrefix, NoPrefix };
 
-typedef bool (*EvalFunc)(CSSValue*, RenderStyle*, LocalFrame*, MediaFeaturePrefix);
+typedef bool (*EvalFunc)(CSSValue*, RenderStyle*, LocalFrame*, MediaFeaturePrefix, MediaValues*, bool);
 typedef HashMap<StringImpl*, EvalFunc> FunctionMap;
 static FunctionMap* gFunctionMap;
 
 MediaQueryEvaluator::MediaQueryEvaluator(bool mediaFeatureResult)
     : m_frame(0)
     , m_style(nullptr)
     , m_expResult(mediaFeatureResult)
+    , m_mediaValues(nullptr)
 {
 }
 
 MediaQueryEvaluator::MediaQueryEvaluator(const String& acceptedMediaType, bool mediaFeatureResult)
     : m_mediaType(acceptedMediaType)
     , m_frame(0)
     , m_style(nullptr)
     , m_expResult(mediaFeatureResult)
+    , m_mediaValues(nullptr)
 {
 }
 
 MediaQueryEvaluator::MediaQueryEvaluator(const char* acceptedMediaType, bool mediaFeatureResult)
     : m_mediaType(acceptedMediaType)
     , m_frame(0)
     , m_style(nullptr)
     , m_expResult(mediaFeatureResult)
+    , m_mediaValues(nullptr)
 {
 }
 
 MediaQueryEvaluator::MediaQueryEvaluator(const String& acceptedMediaType, LocalFrame* frame, RenderStyle* style)
     : m_mediaType(acceptedMediaType)
     , m_frame(frame)
     , m_style(style)
     , m_expResult(false) // Doesn't matter when we have m_frame and m_style.
+    , m_mediaValues(nullptr)
 {
 }
 
+MediaQueryEvaluator::MediaQueryEvaluator(const String& acceptedMediaType, const MediaValues* mediaValues, bool mediaFeatureResult)
+    : m_mediaType(acceptedMediaType)
+    , m_frame(0)
+    , m_style(nullptr)

[abarth-chromium, 2014/03/24 19:43:31]

You can omit this line.  m_style will initialize itself to zero.

[Yoav Weiss, 2014/03/25 12:54:01]

Does that mean that I can also skip m_mediaValues(nullptr) in previous
constructors?

+    , m_expResult(mediaFeatureResult)
+    , m_mediaValues(MediaValues::copy(mediaValues))
+{
+}
+
 MediaQueryEvaluator::~MediaQueryEvaluator()
 {
 }
 
 bool MediaQueryEvaluator::mediaTypeMatch(const String& mediaTypeToMatch) const
 {
     return mediaTypeToMatch.isEmpty()
         || equalIgnoringCase(mediaTypeToMatch, MediaTypeNames::all)
         || equalIgnoringCase(mediaTypeToMatch, m_mediaType);
 }
@@ skipping 33 matching lines @@
             for (; j < expressions.size(); ++j) {
                 bool exprResult = eval(expressions.at(j).get());
                 if (viewportDependentMediaQueryResults && expressions.at(j)->isViewportDependent())
                     viewportDependentMediaQueryResults->append(adoptRefWillBeNoop(new MediaQueryResult(*expressions.at(j), exprResult)));
                 if (!exprResult)
                     break;
             }
 
             // Assume true if we are at the end of the list, otherwise assume false.
             result = applyRestrictor(query->restrictor(), expressions.size() == j);
-        } else
+        } else {
             result = applyRestrictor(query->restrictor(), false);
+        }
     }
 
     return result;
 }
 
 template<typename T>
 bool compareValue(T a, T b, MediaFeaturePrefix op)
 {
     switch (op) {
     case MinPrefix:
@@ skipping 19 matching lines @@
 static bool numberValue(CSSValue* value, float& result)
 {
     if (value->isPrimitiveValue()
         && toCSSPrimitiveValue(value)->isNumber()) {
         result = toCSSPrimitiveValue(value)->getFloatValue(CSSPrimitiveValue::CSS_NUMBER);
         return true;
     }
     return false;
 }
 
-static bool colorMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op)
+static bool colorMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* mediaValues, bool expectedValue)
 {
-    int bitsPerComponent = screenDepthPerComponent(frame->view());
+    if (!frame && !mediaValues)
+        return expectedValue;

[abarth-chromium, 2014/03/24 19:43:31]

Can this case actually occur?  I would have thought it would be an error to call
this function without a Frame and without mediaValues.

[Yoav Weiss, 2014/03/25 12:54:01]

You're right. This case is taken care of at eval().

+
+    int bitsPerComponent;
+    if (frame)
+        bitsPerComponent = screenDepthPerComponent(frame->view());
+    else
+        bitsPerComponent = mediaValues->getColorBitsPerComponent();
+
     float number;
     if (value)
         return numberValue(value, number) && compareValue(bitsPerComponent, static_cast<int>(number), op);
 
     return bitsPerComponent != 0;
 }
 
-static bool colorIndexMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame*, MediaFeaturePrefix op)
+static bool colorIndexMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame*, MediaFeaturePrefix op, MediaValues*, bool)
 {
     // FIXME: We currently assume that we do not support indexed displays, as it is unknown
     // how to retrieve the information if the display mode is indexed. This matches Firefox.
     if (!value)
         return false;
 
     // Acording to spec, if the device does not use a color lookup table, the value is zero.
     float number;
     return numberValue(value, number) && compareValue(0, static_cast<int>(number), op);
 }
 
-static bool monochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix op)
+static bool monochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* mediaValues, bool expectedValue)
 {
-    if (!screenIsMonochrome(frame->view())) {
+    if ((!frame || !style) && !mediaValues)
+        return expectedValue;
+
+    bool isMonochrome;
+    if (frame)
+        isMonochrome = screenIsMonochrome(frame->view());
+    else
+        isMonochrome = (mediaValues->getMonochromeBitsPerComponent() > 0);
+
+    if (!isMonochrome) {
         if (value) {
             float number;
             return numberValue(value, number) && compareValue(0, static_cast<int>(number), op);
         }
         return false;
     }
 
-    return colorMediaFeatureEval(value, style, frame, op);
+    return colorMediaFeatureEval(value, style, frame, op, mediaValues, expectedValue);
 }
 
 static IntSize viewportSize(FrameView* view)
 {
     return view->layoutSize(IncludeScrollbars);
 }
 
-static bool orientationMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix)
+static bool orientationMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    FrameView* view = frame->view();
-    int width = viewportSize(view).width();
-    int height = viewportSize(view).height();
+    if (!frame && !mediaValues)
+        return expectedValue;
+
+    int width;
+    int height;
+    if (frame) {
+        FrameView* view = frame->view();
+        width = viewportSize(view).width();
+        height = viewportSize(view).height();
+    } else {
+        width = mediaValues->getViewportWidth();
+        height = mediaValues->getViewportHeight();
+    }
+
     if (value && value->isPrimitiveValue()) {
         const CSSValueID id = toCSSPrimitiveValue(value)->getValueID();
         if (width > height) // Square viewport is portrait.
             return CSSValueLandscape == id;
         return CSSValuePortrait == id;
     }
 
     // Expression (orientation) evaluates to true if width and height >= 0.
     return height >= 0 && width >= 0;
 }
 
-static bool aspectRatioMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op)
+static bool aspectRatioMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* mediaValues, bool expectedValue)
 {
+    if (!frame && !mediaValues)
+        return expectedValue;
+
     if (value) {
-        FrameView* view = frame->view();
-        return compareAspectRatioValue(value, viewportSize(view).width(), viewportSize(view).height(), op);
+        int width;
+        int height;
+        if (frame) {
+            FrameView* view = frame->view();
+            width = viewportSize(view).width();
+            height = viewportSize(view).height();
+        } else {
+            width = mediaValues->getViewportWidth();
+            height = mediaValues->getViewportHeight();
+        }
+
+        return compareAspectRatioValue(value, width, height, op);
     }
 
     // ({,min-,max-}aspect-ratio)
     // assume if we have a device, its aspect ratio is non-zero.
     return true;
 }
 
-static bool deviceAspectRatioMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op)
+static bool deviceAspectRatioMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* mediaValues, bool expectedValue)
 {
+    if (!frame && !mediaValues)
+        return expectedValue;
+
     if (value) {
-        FloatRect sg = screenRect(frame->view());
-        return compareAspectRatioValue(value, static_cast<int>(sg.width()), static_cast<int>(sg.height()), op);
+        int width;
+        int height;
+        if (frame) {
+            FloatRect sg = screenRect(frame->view());
+            width = static_cast<int>(sg.width());
+            height = static_cast<int>(sg.height());
+        } else {
+            width = mediaValues->getDeviceWidth();
+            height = mediaValues->getDeviceHeight();
+        }

[abarth-chromium, 2014/03/24 19:43:31]

It's kind of lame that each of these functions has to have this branch...  Can
we always use the MediaValues codepath?  Maybe instead of storing a LocalFrame*,
we should instead extract the media values for the frame?

[Yoav Weiss, 2014/03/25 12:54:01]

That makes sense. I'll do that.

+
+        return compareAspectRatioValue(value, width, height, op);
     }
 
     // ({,min-,max-}device-aspect-ratio)
     // assume if we have a device, its aspect ratio is non-zero.
     return true;
 }
 
-static bool evalResolution(CSSValue* value, LocalFrame* frame, MediaFeaturePrefix op)
+static bool evalResolution(CSSValue* value, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* mediaValues, bool expectedValue)
 {
+    if (!frame && !mediaValues)
+        return expectedValue;
+
     // According to MQ4, only 'screen', 'print' and 'speech' may match.
     // FIXME: What should speech match? https://www.w3.org/Style/CSS/Tracker/issues/348
     float actualResolution = 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 = frame->view()->mediaType();
-    if (equalIgnoringCase(mediaType, "screen"))
-        actualResolution = clampTo<float>(frame->devicePixelRatio());
-    else if (equalIgnoringCase(mediaType, "print")) {
-        // 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.
-        actualResolution = 300 / cssPixelsPerInch;
+    if (frame) {
+        String mediaType = frame->view()->mediaType();
+        if (equalIgnoringCase(mediaType, "screen")) {
+            actualResolution = clampTo<float>(frame->devicePixelRatio());
+        } else if (equalIgnoringCase(mediaType, "print")) {
+            // 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.
+            actualResolution = 300 / cssPixelsPerInch;
+        }
+    } else {
+        actualResolution = mediaValues->getPixelRatio();
     }
 
     if (!value)
         return !!actualResolution;
 
     if (!value->isPrimitiveValue())
         return false;
 
     CSSPrimitiveValue* resolution = toCSSPrimitiveValue(value);
 
@@ skipping 10 matching lines @@
         // approximates the reference pixel". With that in mind, allowing 2 decimal
         // point precision seems appropriate.
         return compareValue(
             floorf(0.5 + 100 * actualResolution) / 100,
             floorf(0.5 + 100 * resolution->getFloatValue(CSSPrimitiveValue::CSS_DPPX)) / 100, op);
     }
 
     return compareValue(actualResolution, resolution->getFloatValue(CSSPrimitiveValue::CSS_DPPX), op);
 }
 
-static bool devicePixelRatioMediaFeatureEval(CSSValue *value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op)
+static bool devicePixelRatioMediaFeatureEval(CSSValue *value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* mediaValues, bool expectedValue)
 {
     UseCounter::count(frame->document(), UseCounter::PrefixedDevicePixelRatioMediaFeature);
 
-    return (!value || toCSSPrimitiveValue(value)->isNumber()) && evalResolution(value, frame, op);
+    return (!value || toCSSPrimitiveValue(value)->isNumber()) && evalResolution(value, frame, op, mediaValues, expectedValue);
 }
 
-static bool resolutionMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op)
+static bool resolutionMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* MediaValues, bool expectedValue)
 {
-    return (!value || toCSSPrimitiveValue(value)->isResolution()) && evalResolution(value, frame, op);
+    return (!value || toCSSPrimitiveValue(value)->isResolution()) && evalResolution(value, frame, op, MediaValues, expectedValue);
 }
 
-static bool gridMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame*, MediaFeaturePrefix op)
+static bool gridMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame*, MediaFeaturePrefix op, MediaValues*, bool)
 {
     // if output device is bitmap, grid: 0 == true
     // assume we have bitmap device
     float number;
     if (value && numberValue(value, number))
         return compareValue(static_cast<int>(number), 0, op);
     return false;
 }
 
-static bool computeLength(CSSValue* value, bool strict, RenderStyle* initialStyle, int& result)
+static bool computeLength(CSSValue* value, bool strict, RenderStyle* initialStyle, int defaultFontSize, int& result)
 {
     if (!value->isPrimitiveValue())
         return false;
 
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
 
     if (primitiveValue->isNumber()) {
         result = primitiveValue->getIntValue();
         return !strict || !result;
     }
 
     if (primitiveValue->isLength()) {
-        // Relative (like EM) and root relative (like REM) units are always resolved against
-        // the initial values for media queries, hence the two initialStyle parameters.
-        // FIXME: We need to plumb viewport unit support down to here.
-        result = primitiveValue->computeLength<int>(CSSToLengthConversionData(initialStyle, initialStyle, 0, 1.0 /* zoom */, true /* computingFontSize */));
+        if (initialStyle) {
+            // Relative (like EM) and root relative (like REM) units are always resolved against
+            // the initial values for media queries, hence the two initialStyle parameters.
+            // FIXME: We need to plumb viewport unit support down to here.
+            result = primitiveValue->computeLength<int>(CSSToLengthConversionData(initialStyle, initialStyle, 0, 1.0 /* zoom */, true /* computingFontSize */));
+        } else {
+            unsigned short type = primitiveValue->primitiveType();
+            int factor = 0;
+            if (type == CSSPrimitiveValue::CSS_EMS || type == CSSPrimitiveValue::CSS_REMS) {
+                if (defaultFontSize > 0)
+                    factor = defaultFontSize;
+                else
+                    return false;
+            } else if (type == CSSPrimitiveValue::CSS_PX) {
+                factor = 1;
+            } else {
+                return false;
+            }
+            result = roundForImpreciseConversion<int>(primitiveValue->getDoubleValue()*factor);
+        }
         return true;
     }
 
     return false;
 }
 
-static bool deviceHeightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix op)
+static bool deviceHeightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* mediaValues, bool expectedValue)
 {
+    if ((!frame || !style) && !mediaValues)
+        return expectedValue;
+    int fontSize = 0;
+    if (mediaValues)
+        fontSize = mediaValues->getDefaultFontSize();
+
     if (value) {
+        int height;
         int length;
-        if (!computeLength(value, !frame->document()->inQuirksMode(), style, length))
-            return false;
-        int height = static_cast<int>(screenRect(frame->view()).height());
-        if (frame->settings()->reportScreenSizeInPhysicalPixelsQuirk())
-            height = lroundf(height * frame->host()->deviceScaleFactor());
-        return compareValue(height, length, op);
+        bool inStrictMode = true;
+        if (frame) {
+            height = static_cast<int>(screenRect(frame->view()).height());
+            if (frame->settings()->reportScreenSizeInPhysicalPixelsQuirk())
+                height = lroundf(height * frame->host()->deviceScaleFactor());
+            inStrictMode = !frame->document()->inQuirksMode();
+        } else {
+            height = mediaValues->getDeviceHeight();
+        }
+        return computeLength(value, inStrictMode, style, fontSize, length) && compareValue(static_cast<int>(height), length, op);
     }
     // ({,min-,max-}device-height)
     // assume if we have a device, assume non-zero
     return true;
 }
 
-static bool deviceWidthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix op)
+static bool deviceWidthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* mediaValues, bool expectedValue)
 {
+    if ((!frame || !style) && !mediaValues)
+        return expectedValue;
+    int fontSize = 0;
+    if (mediaValues)
+        fontSize = mediaValues->getDefaultFontSize();
+
     if (value) {
+        int width;
         int length;
-        if (!computeLength(value, !frame->document()->inQuirksMode(), style, length))
-            return false;
-        int width = static_cast<int>(screenRect(frame->view()).width());
-        if (frame->settings()->reportScreenSizeInPhysicalPixelsQuirk())
-            width = lroundf(width * frame->host()->deviceScaleFactor());
-        return compareValue(width, length, op);
+        bool inStrictMode = true;
+        if (frame) {
+            width = static_cast<int>(screenRect(frame->view()).width());
+            if (frame->settings()->reportScreenSizeInPhysicalPixelsQuirk())
+                width = lroundf(width * frame->host()->deviceScaleFactor());
+            inStrictMode = !frame->document()->inQuirksMode();
+        } else {
+            width = mediaValues->getDeviceWidth();
+        }
+        return computeLength(value, inStrictMode, style, fontSize, length) && compareValue(static_cast<int>(width), length, op);
     }
     // ({,min-,max-}device-width)
     // assume if we have a device, assume non-zero
     return true;
 }
 
-static bool heightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix op)
+static bool heightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* mediaValues, bool expectedValue)
 {
+    if ((!frame || !style) && !mediaValues)
+        return expectedValue;
+    int fontSize = 0;
+    if (mediaValues)
+        fontSize = mediaValues->getDefaultFontSize();
+
     FrameView* view = frame->view();
 
     int height = viewportSize(view).height();
     if (value) {
-        if (RenderView* renderView = frame->document()->renderView())
-            height = adjustForAbsoluteZoom(height, renderView);
+        RenderView* renderView = 0;
+        bool inStrictMode = true;
+        if (frame) {
+            if ((renderView = frame->document()->renderView()))
+                height = adjustForAbsoluteZoom(height, renderView);
+            inStrictMode = !frame->document()->inQuirksMode();
+        }
         int length;
-        return computeLength(value, !frame->document()->inQuirksMode(), style, length) && compareValue(height, length, op);
+        return computeLength(value, inStrictMode, style, fontSize, length) && compareValue(height, length, op);
     }
 
     return height;
 }
 
-static bool widthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix op)
+static bool widthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* mediaValues, bool expectedValue)
 {
-    FrameView* view = frame->view();
+    if ((!frame || !style) && !mediaValues)
+        return expectedValue;
+    int fontSize = 0;
+    int width;
+    if (mediaValues)
+        fontSize = mediaValues->getDefaultFontSize();
 
-    int width = viewportSize(view).width();
+    if (frame) {
+        FrameView* view = frame->view();
+        width = viewportSize(view).width();
+    } else {
+        width = mediaValues->getViewportWidth();
+    }
+
     if (value) {
-        if (RenderView* renderView = frame->document()->renderView())
-            width = adjustForAbsoluteZoom(width, renderView);
+        RenderView* renderView = 0;
+        bool inStrictMode = true;
+        if (frame) {
+            if ((renderView = frame->document()->renderView()))
+                width = adjustForAbsoluteZoom(width, renderView);
+            inStrictMode = !frame->document()->inQuirksMode();
+        }
         int length;
-        return computeLength(value, !frame->document()->inQuirksMode(), style, length) && compareValue(width, length, op);
+        return computeLength(value, inStrictMode, style, fontSize, length) && compareValue(width, length, op);
     }
 
     return width;
 }
 
 // Rest of the functions are trampolines which set the prefix according to the media feature expression used.
 
-static bool minColorMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool minColorMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return colorMediaFeatureEval(value, style, frame, MinPrefix);
+    return colorMediaFeatureEval(value, style, frame, MinPrefix, mediaValues, expectedValue);
 }
 
-static bool maxColorMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool maxColorMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return colorMediaFeatureEval(value, style, frame, MaxPrefix);
+    return colorMediaFeatureEval(value, style, frame, MaxPrefix, mediaValues, expectedValue);
 }
 
-static bool minColorIndexMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool minColorIndexMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues*, bool expectedValue)
 {
-    return colorIndexMediaFeatureEval(value, style, frame, MinPrefix);
+    return colorIndexMediaFeatureEval(value, style, frame, MinPrefix, 0, expectedValue);
 }
 
-static bool maxColorIndexMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool maxColorIndexMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues*, bool expectedValue)
 {
-    return colorIndexMediaFeatureEval(value, style, frame, MaxPrefix);
+    return colorIndexMediaFeatureEval(value, style, frame, MaxPrefix, 0, expectedValue);
 }
 
-static bool minMonochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool minMonochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return monochromeMediaFeatureEval(value, style, frame, MinPrefix);
+    return monochromeMediaFeatureEval(value, style, frame, MinPrefix, mediaValues, expectedValue);
 }
 
-static bool maxMonochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool maxMonochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return monochromeMediaFeatureEval(value, style, frame, MaxPrefix);
+    return monochromeMediaFeatureEval(value, style, frame, MaxPrefix, mediaValues, expectedValue);
 }
 
-static bool minAspectRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool minAspectRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return aspectRatioMediaFeatureEval(value, style, frame, MinPrefix);
+    return aspectRatioMediaFeatureEval(value, style, frame, MinPrefix, mediaValues, expectedValue);
 }
 
-static bool maxAspectRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool maxAspectRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return aspectRatioMediaFeatureEval(value, style, frame, MaxPrefix);
+    return aspectRatioMediaFeatureEval(value, style, frame, MaxPrefix, mediaValues, expectedValue);
 }
 
-static bool minDeviceAspectRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool minDeviceAspectRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return deviceAspectRatioMediaFeatureEval(value, style, frame, MinPrefix);
+    return deviceAspectRatioMediaFeatureEval(value, style, frame, MinPrefix, mediaValues, expectedValue);
 }
 
-static bool maxDeviceAspectRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool maxDeviceAspectRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return deviceAspectRatioMediaFeatureEval(value, style, frame, MaxPrefix);
+    return deviceAspectRatioMediaFeatureEval(value, style, frame, MaxPrefix, mediaValues, expectedValue);
 }
 
-static bool minDevicePixelRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool minDevicePixelRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
     UseCounter::count(frame->document(), UseCounter::PrefixedMinDevicePixelRatioMediaFeature);
 
-    return devicePixelRatioMediaFeatureEval(value, style, frame, MinPrefix);
+    return devicePixelRatioMediaFeatureEval(value, style, frame, MinPrefix, mediaValues, expectedValue);
 }
 
-static bool maxDevicePixelRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool maxDevicePixelRatioMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
     UseCounter::count(frame->document(), UseCounter::PrefixedMaxDevicePixelRatioMediaFeature);
 
-    return devicePixelRatioMediaFeatureEval(value, style, frame, MaxPrefix);
+    return devicePixelRatioMediaFeatureEval(value, style, frame, MaxPrefix, mediaValues, expectedValue);
 }
 
-static bool minHeightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool minHeightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return heightMediaFeatureEval(value, style, frame, MinPrefix);
+    return heightMediaFeatureEval(value, style, frame, MinPrefix, mediaValues, expectedValue);
 }
 
-static bool maxHeightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool maxHeightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return heightMediaFeatureEval(value, style, frame, MaxPrefix);
+    return heightMediaFeatureEval(value, style, frame, MaxPrefix, mediaValues, expectedValue);
 }
 
-static bool minWidthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool minWidthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return widthMediaFeatureEval(value, style, frame, MinPrefix);
+    return widthMediaFeatureEval(value, style, frame, MinPrefix, mediaValues, expectedValue);
 }
 
-static bool maxWidthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool maxWidthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return widthMediaFeatureEval(value, style, frame, MaxPrefix);
+    return widthMediaFeatureEval(value, style, frame, MaxPrefix, mediaValues, expectedValue);
 }
 
-static bool minDeviceHeightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool minDeviceHeightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return deviceHeightMediaFeatureEval(value, style, frame, MinPrefix);
+    return deviceHeightMediaFeatureEval(value, style, frame, MinPrefix, mediaValues, expectedValue);
 }
 
-static bool maxDeviceHeightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool maxDeviceHeightMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return deviceHeightMediaFeatureEval(value, style, frame, MaxPrefix);
+    return deviceHeightMediaFeatureEval(value, style, frame, MaxPrefix, mediaValues, expectedValue);
 }
 
-static bool minDeviceWidthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool minDeviceWidthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return deviceWidthMediaFeatureEval(value, style, frame, MinPrefix);
+    return deviceWidthMediaFeatureEval(value, style, frame, MinPrefix, mediaValues, expectedValue);
 }
 
-static bool maxDeviceWidthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool maxDeviceWidthMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return deviceWidthMediaFeatureEval(value, style, frame, MaxPrefix);
+    return deviceWidthMediaFeatureEval(value, style, frame, MaxPrefix, mediaValues, expectedValue);
 }
 
-static bool minResolutionMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool minResolutionMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return resolutionMediaFeatureEval(value, style, frame, MinPrefix);
+    return resolutionMediaFeatureEval(value, style, frame, MinPrefix, mediaValues, expectedValue);
 }
 
-static bool maxResolutionMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix)
+static bool maxResolutionMediaFeatureEval(CSSValue* value, RenderStyle* style, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    return resolutionMediaFeatureEval(value, style, frame, MaxPrefix);
+    return resolutionMediaFeatureEval(value, style, frame, MaxPrefix, mediaValues, expectedValue);
 }
 
-static bool animationMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op)
+static bool animationMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op, MediaValues*, bool)
 {
     UseCounter::count(frame->document(), UseCounter::PrefixedAnimationMediaFeature);
 
     if (value) {
         float number;
         return numberValue(value, number) && compareValue(1, static_cast<int>(number), op);
     }
     return true;
 }
 
-static bool transform2dMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op)
+static bool transform2dMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op, MediaValues*, bool)
 {
     UseCounter::count(frame->document(), UseCounter::PrefixedTransform2dMediaFeature);
 
     if (value) {
         float number;
         return numberValue(value, number) && compareValue(1, static_cast<int>(number), op);
     }
     return true;
 }
 
-static bool transform3dMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op)
+static bool transform3dMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix op, MediaValues* mediaValues, bool expectedValue)
 {
     UseCounter::count(frame->document(), UseCounter::PrefixedTransform3dMediaFeature);
 
+    if (!frame && !mediaValues)
+        return expectedValue;
+
     bool returnValueIfNoParameter;
     int have3dRendering;
 
     bool threeDEnabled = false;
-    if (RenderView* view = frame->contentRenderer())
-        threeDEnabled = view->compositor()->canRender3DTransforms();
+    if (frame) {
+        if (RenderView* view = frame->contentRenderer())
+            threeDEnabled = view->compositor()->canRender3DTransforms();
+    } else {
+        threeDEnabled = mediaValues->getThreeDEnabled();
+    }
 
     returnValueIfNoParameter = threeDEnabled;
     have3dRendering = threeDEnabled ? 1 : 0;
 
     if (value) {
         float number;
         return numberValue(value, number) && compareValue(have3dRendering, static_cast<int>(number), op);
     }
     return returnValueIfNoParameter;
 }
 
-static bool viewModeMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix)
+static bool viewModeMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix, MediaValues*, bool)
 {
     UseCounter::count(frame->document(), UseCounter::PrefixedViewModeMediaFeature);
 
     if (!value)
         return true;
 
     return toCSSPrimitiveValue(value)->getValueID() == CSSValueWindowed;
 }
 
 enum PointerDeviceType { TouchPointer, MousePointer, NoPointer, UnknownPointer };
 
 static PointerDeviceType leastCapablePrimaryPointerDeviceType(LocalFrame* frame)
 {
     if (frame->settings()->deviceSupportsTouch())
         return TouchPointer;
 
     // FIXME: We should also try to determine if we know we have a mouse.
     // When we do this, we'll also need to differentiate between known not to
     // have mouse or touch screen (NoPointer) and unknown (UnknownPointer).
     // We could also take into account other preferences like accessibility
     // settings to decide which of the available pointers should be considered
     // "primary".
 
     return UnknownPointer;
 }
 
-static bool hoverMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix)
+static bool hoverMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    PointerDeviceType pointer = leastCapablePrimaryPointerDeviceType(frame);
+    if (!frame && !mediaValues)
+        return expectedValue;
+
+    PointerDeviceType pointer;
+    if (frame)
+        pointer = leastCapablePrimaryPointerDeviceType(frame);
+    else
+        pointer = static_cast<PointerDeviceType>(mediaValues->getPointer());
 
     // If we're on a port that hasn't explicitly opted into providing pointer device information
     // (or otherwise can't be confident in the pointer hardware available), then behave exactly
     // as if this feature feature isn't supported.
     if (pointer == UnknownPointer)
         return false;
 
     float number = 1;
     if (value) {
         if (!numberValue(value, number))
             return false;
     }
 
     return (pointer == NoPointer && !number)
         || (pointer == TouchPointer && !number)
         || (pointer == MousePointer && number == 1);
 }
 
-static bool pointerMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix)
+static bool pointerMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
-    PointerDeviceType pointer = leastCapablePrimaryPointerDeviceType(frame);
+    if (!frame && !mediaValues)
+        return expectedValue;
+
+    PointerDeviceType pointer;
+    if (frame)
+        pointer = leastCapablePrimaryPointerDeviceType(frame);
+    else
+        pointer = static_cast<PointerDeviceType>(mediaValues->getPointer());
 
     // If we're on a port that hasn't explicitly opted into providing pointer device information
     // (or otherwise can't be confident in the pointer hardware available), then behave exactly
     // as if this feature feature isn't supported.
     if (pointer == UnknownPointer)
         return false;
 
     if (!value)
         return pointer != NoPointer;
 
     if (!value->isPrimitiveValue())
         return false;
 
     const CSSValueID id = toCSSPrimitiveValue(value)->getValueID();
     return (pointer == NoPointer && id == CSSValueNone)
         || (pointer == TouchPointer && id == CSSValueCoarse)
         || (pointer == MousePointer && id == CSSValueFine);
 }
 
-static bool scanMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix)
+static bool scanMediaFeatureEval(CSSValue* value, RenderStyle*, LocalFrame* frame, MediaFeaturePrefix, MediaValues* mediaValues, bool expectedValue)
 {
+    if (!frame && !mediaValues)
+        return expectedValue;
+
     // Scan only applies to 'tv' media.
+    String mediaType;
+    if (frame)
+        mediaType = frame->view()->mediaType();
+    else
+        mediaType = mediaValues->getMediaType();
+
     if (!equalIgnoringCase(frame->view()->mediaType(), "tv"))
         return false;
 
     if (!value)
         return true;
 
     if (!value->isPrimitiveValue())
         return false;
 
     // If a platform interface supplies progressive/interlace info for TVs in the
     // future, it needs to be handled here. For now, assume a modern TV with
     // progressive display.
     return toCSSPrimitiveValue(value)->getValueID() == CSSValueProgressive;
 }
 
 static void createFunctionMap()
 {
     // Create the table.
     gFunctionMap = new FunctionMap;
 #define ADD_TO_FUNCTIONMAP(name)  \
     gFunctionMap->set(name##MediaFeature.impl(), name##MediaFeatureEval);
     CSS_MEDIAQUERY_NAMES_FOR_EACH_MEDIAFEATURE(ADD_TO_FUNCTIONMAP);
 #undef ADD_TO_FUNCTIONMAP
 }
 
 bool MediaQueryEvaluator::eval(const MediaQueryExp* expr) const
 {
-    if (!m_frame || !m_style)
+    if (!m_mediaValues && (!m_frame || !m_style))
         return m_expResult;
 
     if (!gFunctionMap)
         createFunctionMap();
 
     // Call the media feature evaluation function. Assume no prefix and let
     // trampoline functions override the prefix if prefix is used.
     EvalFunc func = gFunctionMap->get(expr->mediaFeature().impl());
     if (func)
-        return func(expr->value(), m_style.get(), m_frame, NoPrefix);
+        return func(expr->value(), m_style.get(), m_frame, NoPrefix, m_mediaValues.get(), m_expResult);
 
     return false;
 }
 
+PassRefPtr<MediaValues> MediaValues::create(Document* document)
+{
+    Document* executingDocument = document->import() ? document->import()->master() : document;
+    ASSERT(executingDocument->frame());
+    ASSERT(executingDocument->renderer());
+    ASSERT(executingDocument->renderer()->style());
+    LocalFrame* frame = executingDocument->frame();
+    RenderStyle* style = executingDocument->renderer()->style();
+
+    // get the values from Frame and Style
+    FrameView* view = frame->view();
+    RenderView* renderView = frame->document()->renderView();
+    int viewportWidth = viewportSize(view).width();
+    int viewportHeight = viewportSize(view).height();

[abarth-chromium, 2014/03/24 19:43:31]

Maybe we should call viewportSize once instead of once for the width and once
for the height?

+    FloatRect sg = screenRect(frame->page()->mainFrame()->view());

[abarth-chromium, 2014/03/24 19:43:31]

sg <--- Please use complete words in variable names.  It's hard to tell from
reading this code what "sg" means.

+    int deviceWidth = static_cast<int>(sg.width());
+    int deviceHeight = static_cast<int>(sg.height());
+    float pixelRatio = frame->page()->deviceScaleFactor();
+    int bitsPerComponent = screenDepthPerComponent(frame->page()->mainFrame()->view());
+    int colorBitsPerComponent = 0;
+    int monochromeBitsPerComponent = 0;
+    int defaultFontSize = style->fontDescription().specifiedSize();
+    bool threeDEnabled = false;
+    String mediaType = frame->view()->mediaType();
+    if (renderView) {
+        viewportWidth = adjustForAbsoluteZoom(viewportWidth, renderView);
+        viewportHeight = adjustForAbsoluteZoom(viewportHeight, renderView);
+    }
+    if (RenderView* view = frame->contentRenderer())
+        threeDEnabled = view->compositor()->canRender3DTransforms();
+    if (screenIsMonochrome(frame->page()->mainFrame()->view()))
+        monochromeBitsPerComponent = bitsPerComponent;
+    else
+        colorBitsPerComponent = bitsPerComponent;
+    PointerDeviceType pointer = leastCapablePrimaryPointerDeviceType(frame);
+
+    return adoptRef(new MediaValues(viewportWidth,
+        viewportHeight,
+        deviceWidth,
+        deviceHeight,
+        pixelRatio,
+        colorBitsPerComponent,
+        monochromeBitsPerComponent,
+        pointer,
+        defaultFontSize,
+        threeDEnabled,
+        mediaType));
+}
+
+PassRefPtr<MediaValues> MediaValues::copy(const MediaValues* mediaValues)
+{
+    return adoptRef(new MediaValues(mediaValues->m_viewportWidth,
+        mediaValues->m_viewportHeight,
+        mediaValues->m_deviceWidth,
+        mediaValues->m_deviceHeight,
+        mediaValues->m_pixelRatio,
+        mediaValues->m_colorBitsPerComponent,
+        mediaValues->m_monochromeBitsPerComponent,
+        mediaValues->m_pointer,
+        mediaValues->m_defaultFontSize,
+        mediaValues->m_threeDEnabled,
+        mediaValues->m_mediaType));

[abarth-chromium, 2014/03/24 19:43:31]

Notice that we're sharing the buffer for m_mediaType.  Do we need to call
isolatedCopy here?

[Yoav Weiss, 2014/03/25 12:54:01]

It's called inside the MediaValues constructor.

+}
+
 } // namespace