зеркало из https://github.com/mozilla/gecko-dev.git
554 строки
18 KiB
C++
554 строки
18 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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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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{
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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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}
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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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aDocument->StyleImageLoader()->MaybeRegisterCSSImage(aValue.GetImageStructValue());
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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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NS_ABORT_IF_FALSE(arguments->Count() == 6, "unexpected num of arguments");
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const nsCSSValue& image = arguments->Item(1);
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TryToStartImageLoadOnValue(image, aDocument);
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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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{
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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);
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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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}
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} else {
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TryToStartImageLoadOnValue(aValue, aDocument);
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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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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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nsIDocument* doc = aRuleData->mPresContext->Document();
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for (uint32_t i = 0; i < mNumProps; i++) {
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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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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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NS_ABORT_IF_FALSE(val->GetUnit() != eCSSUnit_Null, "oops");
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if (ShouldStartImageLoads(aRuleData, iProp)) {
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TryToStartImageLoad(*val, doc, iProp);
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}
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*target = *val;
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if (nsCSSProps::PropHasFlags(iProp,
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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 (iProp == 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 (target->IsNonTransparentColor()) {
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target->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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*target = nsCSSValue();
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}
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}
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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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NS_ABORT_IF_FALSE(!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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NS_ABORT_IF_FALSE(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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NS_ABORT_IF_FALSE(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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NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(iProp), "out of range");
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NS_ABORT_IF_FALSE(!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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NS_ABORT_IF_FALSE(val->GetUnit() != eCSSUnit_Null, "oops");
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NS_ABORT_IF_FALSE(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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NS_ABORT_IF_FALSE(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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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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NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(iProp), "out of range");
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NS_ABORT_IF_FALSE(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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void
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nsCSSExpandedDataBlock::Compress(nsCSSCompressedDataBlock **aNormalBlock,
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nsCSSCompressedDataBlock **aImportantBlock)
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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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/*
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* Save needless copying and allocation by copying the memory
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* corresponding to the stored data in the expanded block, and then
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* clearing the data in the expanded block.
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*/
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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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nsCSSProperty iProp = nsCSSPropertySet::CSSPropertyAt(iHigh, iLow);
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NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(iProp), "out of range");
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bool important =
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mPropertiesImportant.HasPropertyAt(iHigh, iLow);
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nsCSSCompressedDataBlock *result =
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important ? result_important : result_normal;
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uint32_t* ip = important ? &i_important : &i_normal;
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nsCSSValue* val = PropertyAt(iProp);
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NS_ABORT_IF_FALSE(val->GetUnit() != eCSSUnit_Null,
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"Null value while compressing");
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result->SetPropertyAtIndex(*ip, iProp);
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result->RawCopyValueToIndex(*ip, val);
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new (val) nsCSSValue();
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(*ip)++;
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result->mStyleBits |=
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nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[iProp]);
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}
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}
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NS_ABORT_IF_FALSE(numPropsNormal == i_normal, "bad numProps");
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if (result_important) {
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NS_ABORT_IF_FALSE(numPropsImportant == i_important, "bad numProps");
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}
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ClearSets();
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AssertInitialState();
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*aNormalBlock = result_normal.forget();
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*aImportantBlock = result_important.forget();
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}
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void
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nsCSSExpandedDataBlock::AddLonghandProperty(nsCSSProperty aProperty,
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const nsCSSValue& aValue)
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{
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NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aProperty),
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"property out of range");
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nsCSSValue& storage = *static_cast<nsCSSValue*>(PropertyAt(aProperty));
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storage = aValue;
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SetPropertyBit(aProperty);
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}
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void
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nsCSSExpandedDataBlock::Clear()
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{
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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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nsCSSProperty iProp = nsCSSPropertySet::CSSPropertyAt(iHigh, iLow);
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ClearLonghandProperty(iProp);
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}
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}
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AssertInitialState();
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}
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void
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nsCSSExpandedDataBlock::ClearProperty(nsCSSProperty aPropID)
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{
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if (nsCSSProps::IsShorthand(aPropID)) {
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CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aPropID) {
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ClearLonghandProperty(*p);
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}
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} else {
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ClearLonghandProperty(aPropID);
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}
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}
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void
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nsCSSExpandedDataBlock::ClearLonghandProperty(nsCSSProperty aPropID)
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{
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NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aPropID), "out of range");
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ClearPropertyBit(aPropID);
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ClearImportantBit(aPropID);
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PropertyAt(aPropID)->Reset();
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}
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bool
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nsCSSExpandedDataBlock::TransferFromBlock(nsCSSExpandedDataBlock& aFromBlock,
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nsCSSProperty aPropID,
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bool aIsImportant,
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bool aOverrideImportant,
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bool aMustCallValueAppended,
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css::Declaration* aDeclaration)
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{
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if (!nsCSSProps::IsShorthand(aPropID)) {
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return DoTransferFromBlock(aFromBlock, aPropID,
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aIsImportant, aOverrideImportant,
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aMustCallValueAppended, aDeclaration);
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}
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bool changed = false;
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CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aPropID) {
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changed |= DoTransferFromBlock(aFromBlock, *p,
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aIsImportant, aOverrideImportant,
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aMustCallValueAppended, aDeclaration);
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}
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return changed;
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}
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bool
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nsCSSExpandedDataBlock::DoTransferFromBlock(nsCSSExpandedDataBlock& aFromBlock,
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nsCSSProperty aPropID,
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bool aIsImportant,
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bool aOverrideImportant,
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bool aMustCallValueAppended,
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css::Declaration* aDeclaration)
|
|
{
|
|
bool changed = false;
|
|
NS_ABORT_IF_FALSE(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;
|
|
}
|
|
|
|
#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);
|
|
NS_ABORT_IF_FALSE(PropertyAt(prop)->GetUnit() == eCSSUnit_Null,
|
|
"not initial state");
|
|
}
|
|
}
|
|
#endif
|