зеркало из https://github.com/mozilla/gecko-dev.git
432 строки
17 KiB
C++
432 строки
17 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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/* the interface (to internal code) for retrieving computed style data */
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#include "mozilla/ComputedStyle.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/ToString.h"
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#include "nsCSSAnonBoxes.h"
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#include "nsCSSPseudoElements.h"
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#include "nsFontMetrics.h"
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#include "nsStyleConsts.h"
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#include "nsStyleStruct.h"
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#include "nsStyleStructInlines.h"
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#include "nsString.h"
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#include "nsPresContext.h"
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#include "nsWindowSizes.h"
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#include "nsCOMPtr.h"
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#include "mozilla/dom/Document.h"
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#include "nsPrintfCString.h"
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#include "RubyUtils.h"
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#include "mozilla/ComputedStyleInlines.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/ProfilerLabels.h"
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#include "mozilla/ReflowInput.h"
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#include "nsLayoutUtils.h"
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#include "nsCoord.h"
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// Ensure the binding function declarations in ComputedStyle.h matches
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// those in ServoBindings.h.
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#include "mozilla/ServoBindings.h"
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namespace mozilla {
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ComputedStyle::ComputedStyle(PseudoStyleType aPseudoType,
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ServoComputedDataForgotten aComputedValues)
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: mSource(aComputedValues), mPseudoType(aPseudoType) {}
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// If a struct returned nsChangeHint_UpdateContainingBlock, that means that one
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// property's influence on whether we're a containing block for abs-pos or
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// fixed-pos elements has changed.
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//
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// However, we only need to return the hint if the overall computation of
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// whether we establish a containing block has really changed.
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static bool ContainingBlockMayHaveChanged(const ComputedStyle& aOldStyle,
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const ComputedStyle& aNewStyle) {
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auto* oldDisp = aOldStyle.StyleDisplay();
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auto* newDisp = aNewStyle.StyleDisplay();
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if (oldDisp->IsPositionedStyle() != newDisp->IsPositionedStyle()) {
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return true;
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}
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bool fixedCB =
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oldDisp->IsFixedPosContainingBlockForNonSVGTextFrames(aOldStyle);
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if (fixedCB !=
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newDisp->IsFixedPosContainingBlockForNonSVGTextFrames(aNewStyle)) {
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return true;
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}
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// If we were both before and after a fixed-pos containing-block that means
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// that everything else doesn't matter, since all the other conditions are a
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// subset of this.
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if (fixedCB) {
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return false;
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}
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// Note that neither of these two following sets of frames
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// (transform-supporting and layout-and-paint-supporting frames) is a subset
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// of the other, because table frames support contain: layout/paint but not
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// transforms (which are instead inherited to the table wrapper), and quite a
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// few frame types support transforms but not contain: layout/paint (e.g.,
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// table rows and row groups, many SVG frames).
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if (oldDisp->IsFixedPosContainingBlockForTransformSupportingFrames() !=
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newDisp->IsFixedPosContainingBlockForTransformSupportingFrames()) {
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return true;
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}
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if (oldDisp
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->IsFixedPosContainingBlockForContainLayoutAndPaintSupportingFrames() !=
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newDisp
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->IsFixedPosContainingBlockForContainLayoutAndPaintSupportingFrames()) {
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return true;
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}
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return false;
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}
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nsChangeHint ComputedStyle::CalcStyleDifference(const ComputedStyle& aNewStyle,
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uint32_t* aEqualStructs) const {
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AUTO_PROFILER_LABEL("ComputedStyle::CalcStyleDifference", LAYOUT);
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static_assert(StyleStructConstants::kStyleStructCount <= 32,
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"aEqualStructs is not big enough");
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*aEqualStructs = 0;
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nsChangeHint hint = nsChangeHint(0);
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// We must always ensure that we populate the structs on the new style
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// context that are filled in on the old context, so that if we get
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// two style changes in succession, the second of which causes a real
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// style change, the PeekStyleData doesn't return null (implying that
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// nobody ever looked at that struct's data). In other words, we
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// can't skip later structs if we get a big change up front, because
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// we could later get a small change in one of those structs that we
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// don't want to miss.
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DebugOnly<uint32_t> structsFound = 0;
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DebugOnly<int> styleStructCount = 0;
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// Servo's optimization to stop the cascade when there are no style changes
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// that children need to be recascade for relies on comparing all of the
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// structs, not just those that are returned from PeekStyleData, although
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// if PeekStyleData does return null we could avoid to accumulate any change
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// hints for those structs.
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//
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// FIXME(emilio): Reintroduce that optimization either for all kind of structs
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// after bug 1368290 with a weak parent pointer from text, or just for reset
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// structs.
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#define STYLE_STRUCT_BIT(name_) \
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StyleStructConstants::BitFor(StyleStructID::name_)
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#define EXPAND(...) __VA_ARGS__
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#define DO_STRUCT_DIFFERENCE_WITH_ARGS(struct_, extra_args_) \
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PR_BEGIN_MACRO \
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const nsStyle##struct_* this##struct_ = Style##struct_(); \
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structsFound |= STYLE_STRUCT_BIT(struct_); \
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\
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const nsStyle##struct_* other##struct_ = aNewStyle.Style##struct_(); \
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if (this##struct_ == other##struct_) { \
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/* The very same struct, so we know that there will be no */ \
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/* differences. */ \
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*aEqualStructs |= STYLE_STRUCT_BIT(struct_); \
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} else { \
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nsChangeHint difference = \
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this##struct_->CalcDifference(*other##struct_ EXPAND extra_args_); \
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hint |= difference; \
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if (!difference) { \
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*aEqualStructs |= STYLE_STRUCT_BIT(struct_); \
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} \
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} \
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styleStructCount++; \
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PR_END_MACRO
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#define DO_STRUCT_DIFFERENCE(struct_) \
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DO_STRUCT_DIFFERENCE_WITH_ARGS(struct_, ())
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// FIXME: The order of these DO_STRUCT_DIFFERENCE calls is no longer
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// significant. With a small amount of effort, we could replace them with a
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// #include "nsStyleStructList.h".
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DO_STRUCT_DIFFERENCE_WITH_ARGS(Display, (, *StylePosition()));
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DO_STRUCT_DIFFERENCE(XUL);
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DO_STRUCT_DIFFERENCE(Column);
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DO_STRUCT_DIFFERENCE(Content);
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DO_STRUCT_DIFFERENCE(UI);
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DO_STRUCT_DIFFERENCE(Visibility);
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DO_STRUCT_DIFFERENCE(Outline);
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DO_STRUCT_DIFFERENCE(TableBorder);
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DO_STRUCT_DIFFERENCE(Table);
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DO_STRUCT_DIFFERENCE(UIReset);
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DO_STRUCT_DIFFERENCE(Text);
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DO_STRUCT_DIFFERENCE_WITH_ARGS(List, (, *StyleDisplay()));
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DO_STRUCT_DIFFERENCE(SVGReset);
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DO_STRUCT_DIFFERENCE(SVG);
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DO_STRUCT_DIFFERENCE_WITH_ARGS(Position, (, *StyleVisibility()));
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DO_STRUCT_DIFFERENCE(Font);
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DO_STRUCT_DIFFERENCE(Margin);
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DO_STRUCT_DIFFERENCE(Padding);
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DO_STRUCT_DIFFERENCE(Border);
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DO_STRUCT_DIFFERENCE(TextReset);
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DO_STRUCT_DIFFERENCE(Effects);
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DO_STRUCT_DIFFERENCE(Background);
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DO_STRUCT_DIFFERENCE(Page);
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#undef DO_STRUCT_DIFFERENCE
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#undef DO_STRUCT_DIFFERENCE_WITH_ARGS
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#undef EXPAND
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MOZ_ASSERT(styleStructCount == StyleStructConstants::kStyleStructCount,
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"missing a call to DO_STRUCT_DIFFERENCE");
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// Note that we do not check whether this->RelevantLinkVisited() !=
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// aNewContext->RelevantLinkVisited(); we don't need to since
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// nsCSSFrameConstructor::DoContentStateChanged always adds
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// nsChangeHint_RepaintFrame for ElementState::VISITED changes (and
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// needs to, since HasStateDependentStyle probably doesn't work right
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// for ElementState::VISITED). Hopefully this doesn't actually
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// expose whether links are visited to performance tests since all
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// link coloring happens asynchronously at a time when it's hard for
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// the page to measure.
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// However, we do need to compute the larger of the changes that can
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// happen depending on whether the link is visited or unvisited, since
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// doing only the one that's currently appropriate would expose which
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// links are in history to easy performance measurement. Therefore,
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// here, we add nsChangeHint_RepaintFrame hints (the maximum for
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// things that can depend on :visited) for the properties on which we
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// call GetVisitedDependentColor.
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const ComputedStyle* thisVis = GetStyleIfVisited();
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const ComputedStyle* otherVis = aNewStyle.GetStyleIfVisited();
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if (!thisVis != !otherVis) {
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// One style has a style-if-visited and the other doesn't.
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// Presume a difference.
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#define STYLE_STRUCT(name_, fields_) *aEqualStructs &= ~STYLE_STRUCT_BIT(name_);
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#include "nsCSSVisitedDependentPropList.h"
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#undef STYLE_STRUCT
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hint |= nsChangeHint_RepaintFrame;
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} else if (thisVis) {
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// Both styles have a style-if-visited.
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bool change = false;
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// NB: Calling Peek on |this|, not |thisVis|, since callers may look
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// at a struct on |this| without looking at the same struct on
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// |thisVis| (including this function if we skip one of these checks
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// due to change being true already or due to the old style not having a
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// style-if-visited), but not the other way around.
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#define STYLE_FIELD(name_) thisVisStruct->name_ != otherVisStruct->name_
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#define STYLE_STRUCT(name_, fields_) \
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{ \
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const nsStyle##name_* thisVisStruct = thisVis->Style##name_(); \
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const nsStyle##name_* otherVisStruct = otherVis->Style##name_(); \
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if (MOZ_FOR_EACH_SEPARATED(STYLE_FIELD, (||), (), fields_)) { \
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*aEqualStructs &= ~STYLE_STRUCT_BIT(name_); \
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change = true; \
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} \
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}
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#include "nsCSSVisitedDependentPropList.h"
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#undef STYLE_STRUCT
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#undef STYLE_FIELD
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#undef STYLE_STRUCT_BIT
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if (change) {
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hint |= nsChangeHint_RepaintFrame;
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}
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}
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if (hint & nsChangeHint_UpdateContainingBlock) {
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if (!ContainingBlockMayHaveChanged(*this, aNewStyle)) {
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// While some styles that cause the frame to be a containing block
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// has changed, the overall result cannot have changed (no matter
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// what the frame type is).
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hint &= ~nsChangeHint_UpdateContainingBlock;
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}
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}
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if (HasAuthorSpecifiedBorderOrBackground() !=
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aNewStyle.HasAuthorSpecifiedBorderOrBackground()) {
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const StyleAppearance appearance = StyleDisplay()->EffectiveAppearance();
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if (appearance != StyleAppearance::None &&
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nsLayoutUtils::AuthorSpecifiedBorderBackgroundDisablesTheming(
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appearance)) {
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// A background-specified change may cause padding to change, so we may
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// need to reflow. We use the same hint here as we do for "appearance"
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// changes.
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hint |= nsChangeHint_AllReflowHints | nsChangeHint_RepaintFrame;
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}
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}
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MOZ_ASSERT(NS_IsHintSubset(hint, nsChangeHint_AllHints),
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"Added a new hint without bumping AllHints?");
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return hint & ~nsChangeHint_NeutralChange;
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}
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#ifdef DEBUG
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void ComputedStyle::List(FILE* out, int32_t aIndent) {
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nsAutoCString str;
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// Indent
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int32_t ix;
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for (ix = aIndent; --ix >= 0;) {
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str.AppendLiteral(" ");
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}
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str.Append(nsPrintfCString("%p(%d) parent=%p ", (void*)this, 0, nullptr));
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if (mPseudoType != PseudoStyleType::NotPseudo) {
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str.Append(nsPrintfCString("%s ", ToString(mPseudoType).c_str()));
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}
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fprintf_stderr(out, "%s{ServoComputedData}\n", str.get());
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}
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#endif
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template <typename Func>
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static nscolor GetVisitedDependentColorInternal(const ComputedStyle& aStyle,
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Func aColorFunc) {
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nscolor colors[2];
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colors[0] = aColorFunc(aStyle);
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if (const ComputedStyle* visitedStyle = aStyle.GetStyleIfVisited()) {
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colors[1] = aColorFunc(*visitedStyle);
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return ComputedStyle::CombineVisitedColors(colors,
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aStyle.RelevantLinkVisited());
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}
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return colors[0];
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}
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static nscolor ExtractColor(const ComputedStyle& aStyle,
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const StyleRGBA& aColor) {
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return aColor.ToColor();
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}
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static nscolor ExtractColor(const ComputedStyle& aStyle,
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const StyleColor& aColor) {
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return aColor.CalcColor(aStyle);
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}
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// Currently caret-color, the only property in the list which is a ColorOrAuto,
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// always maps auto to currentcolor.
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static nscolor ExtractColor(const ComputedStyle& aStyle,
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const StyleColorOrAuto& aColor) {
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if (aColor.IsAuto()) {
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return ExtractColor(aStyle, StyleColor::CurrentColor());
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}
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return ExtractColor(aStyle, aColor.AsColor());
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}
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static nscolor ExtractColor(const ComputedStyle& aStyle,
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const StyleSVGPaint& aPaintServer) {
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return aPaintServer.kind.IsColor()
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? ExtractColor(aStyle, aPaintServer.kind.AsColor())
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: NS_RGBA(0, 0, 0, 0);
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}
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#define STYLE_FIELD(struct_, field_) aField == &struct_::field_ ||
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#define STYLE_STRUCT(name_, fields_) \
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template <> \
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nscolor ComputedStyle::GetVisitedDependentColor( \
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decltype(nsStyle##name_::MOZ_ARG_1 fields_) nsStyle##name_::*aField) \
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const { \
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MOZ_ASSERT(MOZ_FOR_EACH(STYLE_FIELD, (nsStyle##name_, ), fields_) false, \
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"Getting visited-dependent color for a field in nsStyle" #name_ \
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" which is not listed in nsCSSVisitedDependentPropList.h"); \
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return GetVisitedDependentColorInternal( \
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*this, [aField](const ComputedStyle& aStyle) { \
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return ExtractColor(aStyle, aStyle.Style##name_()->*aField); \
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}); \
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}
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#include "nsCSSVisitedDependentPropList.h"
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#undef STYLE_STRUCT
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#undef STYLE_FIELD
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struct ColorIndexSet {
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uint8_t colorIndex, alphaIndex;
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};
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static const ColorIndexSet gVisitedIndices[2] = {{0, 0}, {1, 0}};
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/* static */
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nscolor ComputedStyle::CombineVisitedColors(nscolor* aColors,
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bool aLinkIsVisited) {
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if (NS_GET_A(aColors[1]) == 0) {
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// If the style-if-visited is transparent, then just use the
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// unvisited style rather than using the (meaningless) color
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// components of the visited style along with a potentially
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// non-transparent alpha value.
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aLinkIsVisited = false;
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}
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// NOTE: We want this code to have as little timing dependence as
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// possible on whether this->RelevantLinkVisited() is true.
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const ColorIndexSet& set = gVisitedIndices[aLinkIsVisited ? 1 : 0];
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nscolor colorColor = aColors[set.colorIndex];
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nscolor alphaColor = aColors[set.alphaIndex];
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return NS_RGBA(NS_GET_R(colorColor), NS_GET_G(colorColor),
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NS_GET_B(colorColor), NS_GET_A(alphaColor));
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}
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#ifdef DEBUG
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/* static */ const char* ComputedStyle::StructName(StyleStructID aSID) {
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switch (aSID) {
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# define STYLE_STRUCT(name_) \
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case StyleStructID::name_: \
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return #name_;
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# include "nsStyleStructList.h"
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# undef STYLE_STRUCT
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default:
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return "Unknown";
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}
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}
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/* static */
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Maybe<StyleStructID> ComputedStyle::LookupStruct(const nsACString& aName) {
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# define STYLE_STRUCT(name_) \
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if (aName.EqualsLiteral(#name_)) return Some(StyleStructID::name_);
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# include "nsStyleStructList.h"
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# undef STYLE_STRUCT
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return Nothing();
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}
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#endif // DEBUG
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ComputedStyle* ComputedStyle::GetCachedLazyPseudoStyle(
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PseudoStyleType aPseudo) const {
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MOZ_ASSERT(PseudoStyle::IsPseudoElement(aPseudo));
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if (nsCSSPseudoElements::PseudoElementSupportsUserActionState(aPseudo)) {
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return nullptr;
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}
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return mCachedInheritingStyles.Lookup(aPseudo);
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}
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MOZ_DEFINE_MALLOC_ENCLOSING_SIZE_OF(ServoComputedValuesMallocEnclosingSizeOf)
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void ComputedStyle::AddSizeOfIncludingThis(nsWindowSizes& aSizes,
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size_t* aCVsSize) const {
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// Note: |this| sits within a servo_arc::Arc, i.e. it is preceded by a
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// refcount. So we need to measure it with a function that can handle an
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// interior pointer. We use ServoComputedValuesMallocEnclosingSizeOf to
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// clearly identify in DMD's output the memory measured here.
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*aCVsSize += ServoComputedValuesMallocEnclosingSizeOf(this);
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mSource.AddSizeOfExcludingThis(aSizes);
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mCachedInheritingStyles.AddSizeOfIncludingThis(aSizes, aCVsSize);
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}
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#ifdef DEBUG
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bool ComputedStyle::EqualForCachedAnonymousContentStyle(
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const ComputedStyle& aOther) const {
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// One thing we can't add UA rules to prevent is different -x-lang
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// values being inherited in. So we use this FFI function function rather
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// than rely on CalcStyleDifference, which can't tell us which specific
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// properties have changed.
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return Servo_ComputedValues_EqualForCachedAnonymousContentStyle(this,
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&aOther);
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}
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void ComputedStyle::DumpMatchedRules() const {
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Servo_ComputedValues_DumpMatchedRules(this);
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}
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#endif
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} // namespace mozilla
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