mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-31 06:05:44 +00:00
719 lines
25 KiB
C++
719 lines
25 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* compact representation of the property-value pairs within a CSS
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* declaration, and the code for expanding and compacting it
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*/
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#include "nsCSSDataBlock.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/css/Declaration.h"
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#include "mozilla/css/ImageLoader.h"
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#include "nsRuleData.h"
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#include "nsStyleSet.h"
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#include "nsStyleContext.h"
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#include "nsIDocument.h"
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#include "WritingModes.h"
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using namespace mozilla;
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/**
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* Does a fast move of aSource to aDest. The previous value in
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* aDest is cleanly destroyed, and aSource is cleared. Returns
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* true if, before the copy, the value at aSource compared unequal
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* to the value at aDest; false otherwise.
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*/
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static bool
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MoveValue(nsCSSValue* aSource, nsCSSValue* aDest)
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{
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bool changed = (*aSource != *aDest);
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aDest->~nsCSSValue();
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memcpy(aDest, aSource, sizeof(nsCSSValue));
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new (aSource) nsCSSValue();
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return changed;
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}
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static bool
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ShouldIgnoreColors(nsRuleData *aRuleData)
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{
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return aRuleData->mLevel != nsStyleSet::eAgentSheet &&
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aRuleData->mLevel != nsStyleSet::eUserSheet &&
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!aRuleData->mPresContext->UseDocumentColors();
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}
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/**
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* Tries to call |nsCSSValue::StartImageLoad()| on an image source.
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* Image sources are specified by |url()| or |-moz-image-rect()| function.
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*/
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static void
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TryToStartImageLoadOnValue(const nsCSSValue& aValue, nsIDocument* aDocument,
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nsCSSValueTokenStream* aTokenStream)
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{
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MOZ_ASSERT(aDocument);
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if (aValue.GetUnit() == eCSSUnit_URL) {
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aValue.StartImageLoad(aDocument);
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if (aTokenStream) {
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aTokenStream->mImageValues.PutEntry(aValue.GetImageStructValue());
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}
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}
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else if (aValue.GetUnit() == eCSSUnit_Image) {
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// If we already have a request, see if this document needs to clone it.
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imgIRequest* request = aValue.GetImageValue(nullptr);
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if (request) {
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mozilla::css::ImageValue* imageValue = aValue.GetImageStructValue();
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aDocument->StyleImageLoader()->MaybeRegisterCSSImage(imageValue);
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if (aTokenStream) {
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aTokenStream->mImageValues.PutEntry(imageValue);
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}
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}
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}
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else if (aValue.EqualsFunction(eCSSKeyword__moz_image_rect)) {
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nsCSSValue::Array* arguments = aValue.GetArrayValue();
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MOZ_ASSERT(arguments->Count() == 6, "unexpected num of arguments");
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const nsCSSValue& image = arguments->Item(1);
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TryToStartImageLoadOnValue(image, aDocument, aTokenStream);
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}
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}
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static void
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TryToStartImageLoad(const nsCSSValue& aValue, nsIDocument* aDocument,
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nsCSSProperty aProperty,
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nsCSSValueTokenStream* aTokenStream)
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{
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if (aValue.GetUnit() == eCSSUnit_List) {
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for (const nsCSSValueList* l = aValue.GetListValue(); l; l = l->mNext) {
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TryToStartImageLoad(l->mValue, aDocument, aProperty, aTokenStream);
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}
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} else if (nsCSSProps::PropHasFlags(aProperty,
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CSS_PROPERTY_IMAGE_IS_IN_ARRAY_0)) {
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if (aValue.GetUnit() == eCSSUnit_Array) {
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TryToStartImageLoadOnValue(aValue.GetArrayValue()->Item(0), aDocument,
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aTokenStream);
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}
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} else {
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TryToStartImageLoadOnValue(aValue, aDocument, aTokenStream);
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}
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}
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static inline bool
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ShouldStartImageLoads(nsRuleData *aRuleData, nsCSSProperty aProperty)
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{
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// Don't initiate image loads for if-visited styles. This is
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// important because:
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// (1) it's a waste of CPU and bandwidth
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// (2) in some cases we'd start the image load on a style change
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// where we wouldn't have started the load initially, which makes
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// which links are visited detectable to Web pages (see bug
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// 557287)
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return !aRuleData->mStyleContext->IsStyleIfVisited() &&
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nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_START_IMAGE_LOADS);
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}
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static void
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MapSinglePropertyInto(nsCSSProperty aProp,
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const nsCSSValue* aValue,
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nsCSSValue* aTarget,
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nsRuleData* aRuleData)
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{
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MOZ_ASSERT(aValue->GetUnit() != eCSSUnit_Null, "oops");
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// Although aTarget is the nsCSSValue we are going to write into,
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// we also look at its value before writing into it. This is done
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// when aTarget is a token stream value, which is the case when we
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// have just re-parsed a property that had a variable reference (in
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// nsCSSParser::ParsePropertyWithVariableReferences). TryToStartImageLoad
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// then records any resulting ImageValue objects on the
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// nsCSSValueTokenStream object we found on aTarget. See the comment
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// above nsCSSValueTokenStream::mImageValues for why.
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MOZ_ASSERT(aTarget->GetUnit() == eCSSUnit_TokenStream ||
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aTarget->GetUnit() == eCSSUnit_Null,
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"aTarget must only be a token stream (when re-parsing "
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"properties with variable references) or null");
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nsCSSValueTokenStream* tokenStream =
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aTarget->GetUnit() == eCSSUnit_TokenStream ?
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aTarget->GetTokenStreamValue() :
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nullptr;
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if (ShouldStartImageLoads(aRuleData, aProp)) {
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nsIDocument* doc = aRuleData->mPresContext->Document();
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TryToStartImageLoad(*aValue, doc, aProp, tokenStream);
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}
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*aTarget = *aValue;
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if (nsCSSProps::PropHasFlags(aProp,
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CSS_PROPERTY_IGNORED_WHEN_COLORS_DISABLED) &&
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ShouldIgnoreColors(aRuleData))
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{
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if (aProp == eCSSProperty_background_color) {
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// Force non-'transparent' background
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// colors to the user's default.
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if (aTarget->IsNonTransparentColor()) {
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aTarget->SetColorValue(aRuleData->mPresContext->
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DefaultBackgroundColor());
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}
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} else {
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// Ignore 'color', 'border-*-color', etc.
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*aTarget = nsCSSValue();
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}
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}
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}
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/**
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* If aProperty is a logical property, converts it to the equivalent physical
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* property based on writing mode information obtained from aRuleData's
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* style context.
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*/
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static inline void
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EnsurePhysicalProperty(nsCSSProperty& aProperty, nsRuleData* aRuleData)
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{
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bool isAxisProperty =
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nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_LOGICAL_AXIS);
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bool isBlock =
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nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_LOGICAL_BLOCK_AXIS);
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int index;
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if (isAxisProperty) {
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LogicalAxis logicalAxis = isBlock ? eLogicalAxisBlock : eLogicalAxisInline;
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uint8_t wm = aRuleData->mStyleContext->StyleVisibility()->mWritingMode;
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PhysicalAxis axis =
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WritingMode::PhysicalAxisForLogicalAxis(wm, logicalAxis);
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// We rely on physical axis constants values matching the order of the
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// physical properties in the logical group array.
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static_assert(eAxisVertical == 0 && eAxisHorizontal == 1,
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"unexpected axis constant values");
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index = axis;
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} else {
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bool isEnd =
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nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_LOGICAL_END_EDGE);
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LogicalEdge edge = isEnd ? eLogicalEdgeEnd : eLogicalEdgeStart;
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// We handle block axis logical properties separately to save a bit of
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// work that the WritingMode constructor does that is unnecessary
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// unless we have an inline axis property.
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mozilla::css::Side side;
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if (isBlock) {
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uint8_t wm = aRuleData->mStyleContext->StyleVisibility()->mWritingMode;
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side = WritingMode::PhysicalSideForBlockAxis(wm, edge);
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} else {
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WritingMode wm(aRuleData->mStyleContext);
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side = wm.PhysicalSideForInlineAxis(edge);
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}
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// We rely on the physical side constant values matching the order of
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// the physical properties in the logical group array.
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static_assert(NS_SIDE_TOP == 0 && NS_SIDE_RIGHT == 1 &&
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NS_SIDE_BOTTOM == 2 && NS_SIDE_LEFT == 3,
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"unexpected side constant values");
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index = side;
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}
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const nsCSSProperty* props = nsCSSProps::LogicalGroup(aProperty);
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#ifdef DEBUG
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{
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size_t len = isAxisProperty ? 2 : 4;
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for (size_t i = 0; i < len; i++) {
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MOZ_ASSERT(props[i] != eCSSProperty_UNKNOWN,
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"unexpected logical group length");
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}
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MOZ_ASSERT(props[len] == eCSSProperty_UNKNOWN,
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"unexpected logical group length");
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}
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#endif
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aProperty = props[index];
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}
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void
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nsCSSCompressedDataBlock::MapRuleInfoInto(nsRuleData *aRuleData) const
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{
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// If we have no data for these structs, then return immediately.
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// This optimization should make us return most of the time, so we
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// have to worry much less (although still some) about the speed of
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// the rest of the function.
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if (!(aRuleData->mSIDs & mStyleBits))
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return;
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// We process these in reverse order so that we end up mapping the
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// right property when one can be expressed using both logical and
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// physical property names.
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for (uint32_t i = mNumProps; i-- > 0; ) {
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nsCSSProperty iProp = PropertyAtIndex(i);
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if (nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[iProp]) &
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aRuleData->mSIDs) {
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if (nsCSSProps::PropHasFlags(iProp, CSS_PROPERTY_LOGICAL)) {
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EnsurePhysicalProperty(iProp, aRuleData);
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// We can't cache anything on the rule tree if we use any data from
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// the style context, since data cached in the rule tree could be
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// used with a style context with a different value.
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aRuleData->mCanStoreInRuleTree = false;
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}
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nsCSSValue* target = aRuleData->ValueFor(iProp);
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if (target->GetUnit() == eCSSUnit_Null) {
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const nsCSSValue *val = ValueAtIndex(i);
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MapSinglePropertyInto(iProp, val, target, aRuleData);
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}
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}
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}
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}
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const nsCSSValue*
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nsCSSCompressedDataBlock::ValueFor(nsCSSProperty aProperty) const
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{
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MOZ_ASSERT(!nsCSSProps::IsShorthand(aProperty),
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"Don't call for shorthands");
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// If we have no data for this struct, then return immediately.
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// This optimization should make us return most of the time, so we
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// have to worry much less (although still some) about the speed of
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// the rest of the function.
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if (!(nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[aProperty]) &
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mStyleBits))
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return nullptr;
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for (uint32_t i = 0; i < mNumProps; i++) {
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if (PropertyAtIndex(i) == aProperty) {
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return ValueAtIndex(i);
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}
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}
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return nullptr;
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}
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bool
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nsCSSCompressedDataBlock::TryReplaceValue(nsCSSProperty aProperty,
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nsCSSExpandedDataBlock& aFromBlock,
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bool *aChanged)
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{
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nsCSSValue* newValue = aFromBlock.PropertyAt(aProperty);
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MOZ_ASSERT(newValue && newValue->GetUnit() != eCSSUnit_Null,
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"cannot replace with empty value");
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const nsCSSValue* oldValue = ValueFor(aProperty);
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if (!oldValue) {
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*aChanged = false;
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return false;
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}
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*aChanged = MoveValue(newValue, const_cast<nsCSSValue*>(oldValue));
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aFromBlock.ClearPropertyBit(aProperty);
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return true;
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}
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nsCSSCompressedDataBlock*
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nsCSSCompressedDataBlock::Clone() const
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{
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nsAutoPtr<nsCSSCompressedDataBlock>
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result(new(mNumProps) nsCSSCompressedDataBlock(mNumProps));
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result->mStyleBits = mStyleBits;
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for (uint32_t i = 0; i < mNumProps; i++) {
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result->SetPropertyAtIndex(i, PropertyAtIndex(i));
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result->CopyValueToIndex(i, ValueAtIndex(i));
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}
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return result.forget();
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}
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nsCSSCompressedDataBlock::~nsCSSCompressedDataBlock()
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{
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for (uint32_t i = 0; i < mNumProps; i++) {
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#ifdef DEBUG
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(void)PropertyAtIndex(i); // this checks the property is in range
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#endif
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const nsCSSValue* val = ValueAtIndex(i);
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MOZ_ASSERT(val->GetUnit() != eCSSUnit_Null, "oops");
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val->~nsCSSValue();
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}
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}
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/* static */ nsCSSCompressedDataBlock*
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nsCSSCompressedDataBlock::CreateEmptyBlock()
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{
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nsCSSCompressedDataBlock *result = new(0) nsCSSCompressedDataBlock(0);
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return result;
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}
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size_t
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nsCSSCompressedDataBlock::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
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{
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size_t n = aMallocSizeOf(this);
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for (uint32_t i = 0; i < mNumProps; i++) {
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n += ValueAtIndex(i)->SizeOfExcludingThis(aMallocSizeOf);
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}
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return n;
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}
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bool
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nsCSSCompressedDataBlock::HasDefaultBorderImageSlice() const
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{
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const nsCSSValueList *slice =
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ValueFor(eCSSProperty_border_image_slice)->GetListValue();
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return !slice->mNext &&
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slice->mValue.GetRectValue().AllSidesEqualTo(
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nsCSSValue(1.0f, eCSSUnit_Percent));
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}
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bool
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nsCSSCompressedDataBlock::HasDefaultBorderImageWidth() const
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{
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const nsCSSRect &width =
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ValueFor(eCSSProperty_border_image_width)->GetRectValue();
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return width.AllSidesEqualTo(nsCSSValue(1.0f, eCSSUnit_Number));
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}
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bool
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nsCSSCompressedDataBlock::HasDefaultBorderImageOutset() const
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{
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const nsCSSRect &outset =
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ValueFor(eCSSProperty_border_image_outset)->GetRectValue();
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return outset.AllSidesEqualTo(nsCSSValue(0.0f, eCSSUnit_Number));
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}
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bool
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nsCSSCompressedDataBlock::HasDefaultBorderImageRepeat() const
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{
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const nsCSSValuePair &repeat =
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ValueFor(eCSSProperty_border_image_repeat)->GetPairValue();
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return repeat.BothValuesEqualTo(
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nsCSSValue(NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH, eCSSUnit_Enumerated));
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}
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/*****************************************************************************/
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nsCSSExpandedDataBlock::nsCSSExpandedDataBlock()
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{
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AssertInitialState();
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}
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nsCSSExpandedDataBlock::~nsCSSExpandedDataBlock()
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{
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AssertInitialState();
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}
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void
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nsCSSExpandedDataBlock::DoExpand(nsCSSCompressedDataBlock *aBlock,
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bool aImportant)
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{
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/*
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* Save needless copying and allocation by copying the memory
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* corresponding to the stored data in the compressed block.
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*/
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for (uint32_t i = 0; i < aBlock->mNumProps; i++) {
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nsCSSProperty iProp = aBlock->PropertyAtIndex(i);
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MOZ_ASSERT(!nsCSSProps::IsShorthand(iProp), "out of range");
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MOZ_ASSERT(!HasPropertyBit(iProp),
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"compressed block has property multiple times");
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SetPropertyBit(iProp);
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if (aImportant)
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SetImportantBit(iProp);
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const nsCSSValue* val = aBlock->ValueAtIndex(i);
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nsCSSValue* dest = PropertyAt(iProp);
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MOZ_ASSERT(val->GetUnit() != eCSSUnit_Null, "oops");
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MOZ_ASSERT(dest->GetUnit() == eCSSUnit_Null,
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"expanding into non-empty block");
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#ifdef NS_BUILD_REFCNT_LOGGING
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dest->~nsCSSValue();
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#endif
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memcpy(dest, val, sizeof(nsCSSValue));
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}
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// Set the number of properties to zero so that we don't destroy the
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// remnants of what we just copied.
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aBlock->SetNumPropsToZero();
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delete aBlock;
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}
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void
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nsCSSExpandedDataBlock::Expand(nsCSSCompressedDataBlock *aNormalBlock,
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nsCSSCompressedDataBlock *aImportantBlock)
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{
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MOZ_ASSERT(aNormalBlock, "unexpected null block");
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AssertInitialState();
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DoExpand(aNormalBlock, false);
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if (aImportantBlock) {
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DoExpand(aImportantBlock, true);
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}
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}
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|
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void
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nsCSSExpandedDataBlock::ComputeNumProps(uint32_t* aNumPropsNormal,
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uint32_t* aNumPropsImportant)
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{
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*aNumPropsNormal = *aNumPropsImportant = 0;
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for (size_t iHigh = 0; iHigh < nsCSSPropertySet::kChunkCount; ++iHigh) {
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if (!mPropertiesSet.HasPropertyInChunk(iHigh))
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continue;
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for (size_t iLow = 0; iLow < nsCSSPropertySet::kBitsInChunk; ++iLow) {
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if (!mPropertiesSet.HasPropertyAt(iHigh, iLow))
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continue;
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#ifdef DEBUG
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nsCSSProperty iProp = nsCSSPropertySet::CSSPropertyAt(iHigh, iLow);
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#endif
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MOZ_ASSERT(!nsCSSProps::IsShorthand(iProp), "out of range");
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MOZ_ASSERT(PropertyAt(iProp)->GetUnit() != eCSSUnit_Null,
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"null value while computing size");
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if (mPropertiesImportant.HasPropertyAt(iHigh, iLow))
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(*aNumPropsImportant)++;
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else
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(*aNumPropsNormal)++;
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}
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}
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}
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|
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void
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nsCSSExpandedDataBlock::Compress(nsCSSCompressedDataBlock **aNormalBlock,
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nsCSSCompressedDataBlock **aImportantBlock,
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const nsTArray<uint32_t>& aOrder)
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{
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nsAutoPtr<nsCSSCompressedDataBlock> result_normal, result_important;
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uint32_t i_normal = 0, i_important = 0;
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uint32_t numPropsNormal, numPropsImportant;
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ComputeNumProps(&numPropsNormal, &numPropsImportant);
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result_normal =
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new(numPropsNormal) nsCSSCompressedDataBlock(numPropsNormal);
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if (numPropsImportant != 0) {
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result_important =
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new(numPropsImportant) nsCSSCompressedDataBlock(numPropsImportant);
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} else {
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result_important = nullptr;
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}
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/*
|
|
* Save needless copying and allocation by copying the memory
|
|
* corresponding to the stored data in the expanded block, and then
|
|
* clearing the data in the expanded block.
|
|
*/
|
|
for (size_t i = 0; i < aOrder.Length(); i++) {
|
|
nsCSSProperty iProp = static_cast<nsCSSProperty>(aOrder[i]);
|
|
if (iProp >= eCSSProperty_COUNT) {
|
|
// a custom property
|
|
continue;
|
|
}
|
|
MOZ_ASSERT(mPropertiesSet.HasProperty(iProp),
|
|
"aOrder identifies a property not in the expanded "
|
|
"data block");
|
|
MOZ_ASSERT(!nsCSSProps::IsShorthand(iProp), "out of range");
|
|
bool important = mPropertiesImportant.HasProperty(iProp);
|
|
nsCSSCompressedDataBlock *result =
|
|
important ? result_important : result_normal;
|
|
uint32_t* ip = important ? &i_important : &i_normal;
|
|
nsCSSValue* val = PropertyAt(iProp);
|
|
MOZ_ASSERT(val->GetUnit() != eCSSUnit_Null,
|
|
"Null value while compressing");
|
|
result->SetPropertyAtIndex(*ip, iProp);
|
|
result->RawCopyValueToIndex(*ip, val);
|
|
new (val) nsCSSValue();
|
|
(*ip)++;
|
|
result->mStyleBits |=
|
|
nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[iProp]);
|
|
}
|
|
|
|
MOZ_ASSERT(numPropsNormal == i_normal, "bad numProps");
|
|
|
|
if (result_important) {
|
|
MOZ_ASSERT(numPropsImportant == i_important, "bad numProps");
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
{
|
|
// assert that we didn't have any other properties on this expanded data
|
|
// block that we didn't find in aOrder
|
|
uint32_t numPropsInSet = 0;
|
|
for (size_t iHigh = 0; iHigh < nsCSSPropertySet::kChunkCount; iHigh++) {
|
|
if (!mPropertiesSet.HasPropertyInChunk(iHigh)) {
|
|
continue;
|
|
}
|
|
for (size_t iLow = 0; iLow < nsCSSPropertySet::kBitsInChunk; iLow++) {
|
|
if (mPropertiesSet.HasPropertyAt(iHigh, iLow)) {
|
|
numPropsInSet++;
|
|
}
|
|
}
|
|
}
|
|
MOZ_ASSERT(numPropsNormal + numPropsImportant == numPropsInSet,
|
|
"aOrder missing properties from the expanded data block");
|
|
}
|
|
#endif
|
|
|
|
ClearSets();
|
|
AssertInitialState();
|
|
*aNormalBlock = result_normal.forget();
|
|
*aImportantBlock = result_important.forget();
|
|
}
|
|
|
|
void
|
|
nsCSSExpandedDataBlock::AddLonghandProperty(nsCSSProperty aProperty,
|
|
const nsCSSValue& aValue)
|
|
{
|
|
MOZ_ASSERT(!nsCSSProps::IsShorthand(aProperty),
|
|
"property out of range");
|
|
nsCSSValue& storage = *static_cast<nsCSSValue*>(PropertyAt(aProperty));
|
|
storage = aValue;
|
|
SetPropertyBit(aProperty);
|
|
}
|
|
|
|
void
|
|
nsCSSExpandedDataBlock::Clear()
|
|
{
|
|
for (size_t iHigh = 0; iHigh < nsCSSPropertySet::kChunkCount; ++iHigh) {
|
|
if (!mPropertiesSet.HasPropertyInChunk(iHigh))
|
|
continue;
|
|
for (size_t iLow = 0; iLow < nsCSSPropertySet::kBitsInChunk; ++iLow) {
|
|
if (!mPropertiesSet.HasPropertyAt(iHigh, iLow))
|
|
continue;
|
|
nsCSSProperty iProp = nsCSSPropertySet::CSSPropertyAt(iHigh, iLow);
|
|
ClearLonghandProperty(iProp);
|
|
}
|
|
}
|
|
|
|
AssertInitialState();
|
|
}
|
|
|
|
void
|
|
nsCSSExpandedDataBlock::ClearProperty(nsCSSProperty aPropID)
|
|
{
|
|
if (nsCSSProps::IsShorthand(aPropID)) {
|
|
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aPropID,
|
|
nsCSSProps::eIgnoreEnabledState) {
|
|
ClearLonghandProperty(*p);
|
|
}
|
|
} else {
|
|
ClearLonghandProperty(aPropID);
|
|
}
|
|
}
|
|
|
|
void
|
|
nsCSSExpandedDataBlock::ClearLonghandProperty(nsCSSProperty aPropID)
|
|
{
|
|
MOZ_ASSERT(!nsCSSProps::IsShorthand(aPropID), "out of range");
|
|
|
|
ClearPropertyBit(aPropID);
|
|
ClearImportantBit(aPropID);
|
|
PropertyAt(aPropID)->Reset();
|
|
}
|
|
|
|
bool
|
|
nsCSSExpandedDataBlock::TransferFromBlock(nsCSSExpandedDataBlock& aFromBlock,
|
|
nsCSSProperty aPropID,
|
|
nsCSSProps::EnabledState aEnabledState,
|
|
bool aIsImportant,
|
|
bool aOverrideImportant,
|
|
bool aMustCallValueAppended,
|
|
css::Declaration* aDeclaration)
|
|
{
|
|
if (!nsCSSProps::IsShorthand(aPropID)) {
|
|
return DoTransferFromBlock(aFromBlock, aPropID,
|
|
aIsImportant, aOverrideImportant,
|
|
aMustCallValueAppended, aDeclaration);
|
|
}
|
|
|
|
// We can pass eIgnoreEnabledState (here, and in ClearProperty above) rather
|
|
// than a value corresponding to whether we're parsing a UA style sheet or
|
|
// certified app because we assert in nsCSSProps::AddRefTable that shorthand
|
|
// properties available in these contexts also have all of their
|
|
// subproperties available in these contexts.
|
|
bool changed = false;
|
|
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aPropID, aEnabledState) {
|
|
changed |= DoTransferFromBlock(aFromBlock, *p,
|
|
aIsImportant, aOverrideImportant,
|
|
aMustCallValueAppended, aDeclaration);
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
bool
|
|
nsCSSExpandedDataBlock::DoTransferFromBlock(nsCSSExpandedDataBlock& aFromBlock,
|
|
nsCSSProperty aPropID,
|
|
bool aIsImportant,
|
|
bool aOverrideImportant,
|
|
bool aMustCallValueAppended,
|
|
css::Declaration* aDeclaration)
|
|
{
|
|
bool changed = false;
|
|
MOZ_ASSERT(aFromBlock.HasPropertyBit(aPropID), "oops");
|
|
if (aIsImportant) {
|
|
if (!HasImportantBit(aPropID))
|
|
changed = true;
|
|
SetImportantBit(aPropID);
|
|
} else {
|
|
if (HasImportantBit(aPropID)) {
|
|
// When parsing a declaration block, an !important declaration
|
|
// is not overwritten by an ordinary declaration of the same
|
|
// property later in the block. However, CSSOM manipulations
|
|
// come through here too, and in that case we do want to
|
|
// overwrite the property.
|
|
if (!aOverrideImportant) {
|
|
aFromBlock.ClearLonghandProperty(aPropID);
|
|
return false;
|
|
}
|
|
changed = true;
|
|
ClearImportantBit(aPropID);
|
|
}
|
|
}
|
|
|
|
if (aMustCallValueAppended || !HasPropertyBit(aPropID)) {
|
|
aDeclaration->ValueAppended(aPropID);
|
|
}
|
|
|
|
SetPropertyBit(aPropID);
|
|
aFromBlock.ClearPropertyBit(aPropID);
|
|
|
|
/*
|
|
* Save needless copying and allocation by calling the destructor in
|
|
* the destination, copying memory directly, and then using placement
|
|
* new.
|
|
*/
|
|
changed |= MoveValue(aFromBlock.PropertyAt(aPropID), PropertyAt(aPropID));
|
|
return changed;
|
|
}
|
|
|
|
void
|
|
nsCSSExpandedDataBlock::MapRuleInfoInto(nsCSSProperty aPropID,
|
|
nsRuleData* aRuleData) const
|
|
{
|
|
MOZ_ASSERT(!nsCSSProps::IsShorthand(aPropID));
|
|
|
|
const nsCSSValue* src = PropertyAt(aPropID);
|
|
MOZ_ASSERT(src->GetUnit() != eCSSUnit_Null);
|
|
|
|
nsCSSProperty physicalProp = aPropID;
|
|
if (nsCSSProps::PropHasFlags(aPropID, CSS_PROPERTY_LOGICAL)) {
|
|
EnsurePhysicalProperty(physicalProp, aRuleData);
|
|
aRuleData->mCanStoreInRuleTree = false;
|
|
}
|
|
|
|
nsCSSValue* dest = aRuleData->ValueFor(physicalProp);
|
|
MOZ_ASSERT(dest->GetUnit() == eCSSUnit_TokenStream &&
|
|
dest->GetTokenStreamValue()->mPropertyID == aPropID);
|
|
|
|
MapSinglePropertyInto(physicalProp, src, dest, aRuleData);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void
|
|
nsCSSExpandedDataBlock::DoAssertInitialState()
|
|
{
|
|
mPropertiesSet.AssertIsEmpty("not initial state");
|
|
mPropertiesImportant.AssertIsEmpty("not initial state");
|
|
|
|
for (uint32_t i = 0; i < eCSSProperty_COUNT_no_shorthands; ++i) {
|
|
nsCSSProperty prop = nsCSSProperty(i);
|
|
MOZ_ASSERT(PropertyAt(prop)->GetUnit() == eCSSUnit_Null,
|
|
"not initial state");
|
|
}
|
|
}
|
|
#endif
|