forked from mirrors/gecko-dev
c8476cb106
Computed color values will not be in the correct format, closer to the one specified by the author. This also means that colors accross the code are stored now as AbsoluteColor or StyleAbsoluteColor. This allows color space/gamut information to be available for use. Some animation related test failures had to be changed, because colors now has greater precision. Animated a color now causes a lot more animation updates, which was not initially expected. See the bug for discussion. Differential Revision: https://phabricator.services.mozilla.com/D171021
433 lines
18 KiB
C++
433 lines
18 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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const auto& oldDisp = *aOldStyle.StyleDisplay();
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const auto& newDisp = *aNewStyle.StyleDisplay();
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if (oldDisp.IsPositionedStyle() != newDisp.IsPositionedStyle()) {
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// XXX This check can probably be moved to after the fixedCB check, since
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// IsPositionedStyle() is also only relevant for non-svg text frame
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// subtrees.
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return true;
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}
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const bool fixedCB = aOldStyle.IsFixedPosContainingBlockForNonSVGTextFrames();
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if (fixedCB != aNewStyle.IsFixedPosContainingBlockForNonSVGTextFrames()) {
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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 StyleAbsoluteColor& 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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