зеркало из https://github.com/mozilla/gecko-dev.git
398 строки
16 KiB
C++
398 строки
16 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* the interface (to internal code) for retrieving computed style data */
|
|
|
|
#include "mozilla/ComputedStyle.h"
|
|
#include "mozilla/DebugOnly.h"
|
|
#include "mozilla/Maybe.h"
|
|
#include "mozilla/ToString.h"
|
|
|
|
#include "nsCSSAnonBoxes.h"
|
|
#include "nsCSSPseudoElements.h"
|
|
#include "nsFontMetrics.h"
|
|
#include "nsStyleConsts.h"
|
|
#include "nsStyleStruct.h"
|
|
#include "nsStyleStructInlines.h"
|
|
#include "nsString.h"
|
|
#include "nsPresContext.h"
|
|
#include "nsWindowSizes.h"
|
|
|
|
#include "nsCOMPtr.h"
|
|
|
|
#include "GeckoProfiler.h"
|
|
#include "mozilla/dom/Document.h"
|
|
#include "nsPrintfCString.h"
|
|
#include "RubyUtils.h"
|
|
#include "mozilla/ComputedStyleInlines.h"
|
|
#include "mozilla/Preferences.h"
|
|
|
|
#include "mozilla/ReflowInput.h"
|
|
#include "nsLayoutUtils.h"
|
|
#include "nsCoord.h"
|
|
|
|
// Ensure the binding function declarations in ComputedStyle.h matches
|
|
// those in ServoBindings.h.
|
|
#include "mozilla/ServoBindings.h"
|
|
|
|
namespace mozilla {
|
|
|
|
//----------------------------------------------------------------------
|
|
|
|
ComputedStyle::ComputedStyle(PseudoStyleType aPseudoType,
|
|
ServoComputedDataForgotten aComputedValues)
|
|
: mSource(aComputedValues), mPseudoType(aPseudoType) {}
|
|
|
|
nsChangeHint ComputedStyle::CalcStyleDifference(const ComputedStyle& aNewStyle,
|
|
uint32_t* aEqualStructs) const {
|
|
AUTO_PROFILER_LABEL("ComputedStyle::CalcStyleDifference", LAYOUT);
|
|
static_assert(StyleStructConstants::kStyleStructCount <= 32,
|
|
"aEqualStructs is not big enough");
|
|
|
|
*aEqualStructs = 0;
|
|
|
|
nsChangeHint hint = nsChangeHint(0);
|
|
// We must always ensure that we populate the structs on the new style
|
|
// context that are filled in on the old context, so that if we get
|
|
// two style changes in succession, the second of which causes a real
|
|
// style change, the PeekStyleData doesn't return null (implying that
|
|
// nobody ever looked at that struct's data). In other words, we
|
|
// can't skip later structs if we get a big change up front, because
|
|
// we could later get a small change in one of those structs that we
|
|
// don't want to miss.
|
|
|
|
DebugOnly<uint32_t> structsFound = 0;
|
|
|
|
DebugOnly<int> styleStructCount = 0;
|
|
|
|
// Servo's optimization to stop the cascade when there are no style changes
|
|
// that children need to be recascade for relies on comparing all of the
|
|
// structs, not just those that are returned from PeekStyleData, although
|
|
// if PeekStyleData does return null we could avoid to accumulate any change
|
|
// hints for those structs.
|
|
//
|
|
// FIXME(emilio): Reintroduce that optimization either for all kind of structs
|
|
// after bug 1368290 with a weak parent pointer from text, or just for reset
|
|
// structs.
|
|
#define STYLE_STRUCT_BIT(name_) \
|
|
StyleStructConstants::BitFor(StyleStructID::name_)
|
|
|
|
#define EXPAND(...) __VA_ARGS__
|
|
#define DO_STRUCT_DIFFERENCE_WITH_ARGS(struct_, extra_args_) \
|
|
PR_BEGIN_MACRO \
|
|
const nsStyle##struct_* this##struct_ = Style##struct_(); \
|
|
structsFound |= STYLE_STRUCT_BIT(struct_); \
|
|
\
|
|
const nsStyle##struct_* other##struct_ = aNewStyle.Style##struct_(); \
|
|
if (this##struct_ == other##struct_) { \
|
|
/* The very same struct, so we know that there will be no */ \
|
|
/* differences. */ \
|
|
*aEqualStructs |= STYLE_STRUCT_BIT(struct_); \
|
|
} else { \
|
|
nsChangeHint difference = \
|
|
this##struct_->CalcDifference(*other##struct_ EXPAND extra_args_); \
|
|
hint |= difference; \
|
|
if (!difference) { \
|
|
*aEqualStructs |= STYLE_STRUCT_BIT(struct_); \
|
|
} \
|
|
} \
|
|
styleStructCount++; \
|
|
PR_END_MACRO
|
|
#define DO_STRUCT_DIFFERENCE(struct_) \
|
|
DO_STRUCT_DIFFERENCE_WITH_ARGS(struct_, ())
|
|
|
|
// FIXME: The order of these DO_STRUCT_DIFFERENCE calls is no longer
|
|
// significant. With a small amount of effort, we could replace them with a
|
|
// #include "nsStyleStructList.h".
|
|
DO_STRUCT_DIFFERENCE(Display);
|
|
DO_STRUCT_DIFFERENCE(XUL);
|
|
DO_STRUCT_DIFFERENCE(Column);
|
|
DO_STRUCT_DIFFERENCE(Content);
|
|
DO_STRUCT_DIFFERENCE(UI);
|
|
DO_STRUCT_DIFFERENCE(Visibility);
|
|
DO_STRUCT_DIFFERENCE(Outline);
|
|
DO_STRUCT_DIFFERENCE(TableBorder);
|
|
DO_STRUCT_DIFFERENCE(Table);
|
|
DO_STRUCT_DIFFERENCE(UIReset);
|
|
DO_STRUCT_DIFFERENCE(Text);
|
|
DO_STRUCT_DIFFERENCE_WITH_ARGS(List, (, *StyleDisplay()));
|
|
DO_STRUCT_DIFFERENCE(SVGReset);
|
|
DO_STRUCT_DIFFERENCE(SVG);
|
|
DO_STRUCT_DIFFERENCE_WITH_ARGS(Position, (, *StyleVisibility()));
|
|
DO_STRUCT_DIFFERENCE(Font);
|
|
DO_STRUCT_DIFFERENCE(Margin);
|
|
DO_STRUCT_DIFFERENCE(Padding);
|
|
DO_STRUCT_DIFFERENCE(Border);
|
|
DO_STRUCT_DIFFERENCE(TextReset);
|
|
DO_STRUCT_DIFFERENCE(Effects);
|
|
DO_STRUCT_DIFFERENCE(Background);
|
|
|
|
#undef DO_STRUCT_DIFFERENCE
|
|
#undef DO_STRUCT_DIFFERENCE_WITH_ARGS
|
|
#undef EXPAND
|
|
|
|
MOZ_ASSERT(styleStructCount == StyleStructConstants::kStyleStructCount,
|
|
"missing a call to DO_STRUCT_DIFFERENCE");
|
|
|
|
// Note that we do not check whether this->RelevantLinkVisited() !=
|
|
// aNewContext->RelevantLinkVisited(); we don't need to since
|
|
// nsCSSFrameConstructor::DoContentStateChanged always adds
|
|
// nsChangeHint_RepaintFrame for NS_EVENT_STATE_VISITED changes (and
|
|
// needs to, since HasStateDependentStyle probably doesn't work right
|
|
// for NS_EVENT_STATE_VISITED). Hopefully this doesn't actually
|
|
// expose whether links are visited to performance tests since all
|
|
// link coloring happens asynchronously at a time when it's hard for
|
|
// the page to measure.
|
|
// However, we do need to compute the larger of the changes that can
|
|
// happen depending on whether the link is visited or unvisited, since
|
|
// doing only the one that's currently appropriate would expose which
|
|
// links are in history to easy performance measurement. Therefore,
|
|
// here, we add nsChangeHint_RepaintFrame hints (the maximum for
|
|
// things that can depend on :visited) for the properties on which we
|
|
// call GetVisitedDependentColor.
|
|
const ComputedStyle* thisVis = GetStyleIfVisited();
|
|
const ComputedStyle* otherVis = aNewStyle.GetStyleIfVisited();
|
|
if (!thisVis != !otherVis) {
|
|
// One style has a style-if-visited and the other doesn't.
|
|
// Presume a difference.
|
|
#define STYLE_STRUCT(name_, fields_) *aEqualStructs &= ~STYLE_STRUCT_BIT(name_);
|
|
#include "nsCSSVisitedDependentPropList.h"
|
|
#undef STYLE_STRUCT
|
|
hint |= nsChangeHint_RepaintFrame;
|
|
} else if (thisVis) {
|
|
// Both styles have a style-if-visited.
|
|
bool change = false;
|
|
|
|
// NB: Calling Peek on |this|, not |thisVis|, since callers may look
|
|
// at a struct on |this| without looking at the same struct on
|
|
// |thisVis| (including this function if we skip one of these checks
|
|
// due to change being true already or due to the old style not having a
|
|
// style-if-visited), but not the other way around.
|
|
#define STYLE_FIELD(name_) thisVisStruct->name_ != otherVisStruct->name_
|
|
#define STYLE_STRUCT(name_, fields_) \
|
|
{ \
|
|
const nsStyle##name_* thisVisStruct = thisVis->Style##name_(); \
|
|
const nsStyle##name_* otherVisStruct = otherVis->Style##name_(); \
|
|
if (MOZ_FOR_EACH_SEPARATED(STYLE_FIELD, (||), (), fields_)) { \
|
|
*aEqualStructs &= ~STYLE_STRUCT_BIT(name_); \
|
|
change = true; \
|
|
} \
|
|
}
|
|
#include "nsCSSVisitedDependentPropList.h"
|
|
#undef STYLE_STRUCT
|
|
#undef STYLE_FIELD
|
|
#undef STYLE_STRUCT_BIT
|
|
|
|
if (change) {
|
|
hint |= nsChangeHint_RepaintFrame;
|
|
}
|
|
}
|
|
|
|
if (hint & nsChangeHint_UpdateContainingBlock) {
|
|
// If a struct returned nsChangeHint_UpdateContainingBlock, that
|
|
// means that one property's influence on whether we're a containing
|
|
// block for abs-pos or fixed-pos elements has changed. However, we
|
|
// only need to return the hint if the overall computation of
|
|
// whether we establish a containing block has changed.
|
|
|
|
// This depends on data in nsStyleDisplay and nsStyleEffects, so we do it
|
|
// here
|
|
|
|
// Note that it's perhaps good for this test to be last because it
|
|
// doesn't use Peek* functions to get the structs on the old
|
|
// context. But this isn't a big concern because these struct
|
|
// getters should be called during frame construction anyway.
|
|
const nsStyleDisplay* oldDisp = StyleDisplay();
|
|
const nsStyleDisplay* newDisp = aNewStyle.StyleDisplay();
|
|
bool isFixedCB;
|
|
if (oldDisp->IsAbsPosContainingBlockForNonSVGTextFrames() ==
|
|
newDisp->IsAbsPosContainingBlockForNonSVGTextFrames() &&
|
|
(isFixedCB =
|
|
oldDisp->IsFixedPosContainingBlockForNonSVGTextFrames(*this)) ==
|
|
newDisp->IsFixedPosContainingBlockForNonSVGTextFrames(aNewStyle) &&
|
|
// transform-supporting frames are a subcategory of non-SVG-text
|
|
// frames, so no need to test this if isFixedCB is true (both
|
|
// before and after the change)
|
|
(isFixedCB ||
|
|
oldDisp->IsFixedPosContainingBlockForTransformSupportingFrames() ==
|
|
newDisp
|
|
->IsFixedPosContainingBlockForTransformSupportingFrames()) &&
|
|
// contain-layout-and-paint-supporting frames are a subset of
|
|
// non-SVG-text frames, so no need to test this if isFixedCB is true
|
|
// (both before and after the change).
|
|
//
|
|
// Note, however, that neither of these last two sets is a
|
|
// subset of the other, because table frames support contain:
|
|
// layout/paint but not transforms (which are instead inherited
|
|
// to the table wrapper), and quite a few frame types support
|
|
// transforms but not contain: layout/paint (e.g., table rows
|
|
// and row groups, many SVG frames).
|
|
(isFixedCB ||
|
|
oldDisp->IsFixedPosContainingBlockForContainLayoutAndPaintSupportingFrames() ==
|
|
newDisp
|
|
->IsFixedPosContainingBlockForContainLayoutAndPaintSupportingFrames())) {
|
|
// While some styles that cause the frame to be a containing block
|
|
// has changed, the overall result cannot have changed (no matter
|
|
// what the frame type is).
|
|
hint &= ~nsChangeHint_UpdateContainingBlock;
|
|
}
|
|
}
|
|
|
|
MOZ_ASSERT(NS_IsHintSubset(hint, nsChangeHint_AllHints),
|
|
"Added a new hint without bumping AllHints?");
|
|
return hint & ~nsChangeHint_NeutralChange;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void ComputedStyle::List(FILE* out, int32_t aIndent) {
|
|
nsAutoCString str;
|
|
// Indent
|
|
int32_t ix;
|
|
for (ix = aIndent; --ix >= 0;) {
|
|
str.AppendLiteral(" ");
|
|
}
|
|
str.Append(nsPrintfCString("%p(%d) parent=%p ", (void*)this, 0, nullptr));
|
|
if (mPseudoType != PseudoStyleType::NotPseudo) {
|
|
str.Append(nsPrintfCString("%s ", ToString(mPseudoType).c_str()));
|
|
}
|
|
|
|
fprintf_stderr(out, "%s{ServoComputedData}\n", str.get());
|
|
}
|
|
#endif
|
|
|
|
template <typename Func>
|
|
static nscolor GetVisitedDependentColorInternal(ComputedStyle* aSc,
|
|
Func aColorFunc) {
|
|
nscolor colors[2];
|
|
colors[0] = aColorFunc(aSc);
|
|
if (ComputedStyle* visitedStyle = aSc->GetStyleIfVisited()) {
|
|
colors[1] = aColorFunc(visitedStyle);
|
|
return ComputedStyle::CombineVisitedColors(colors,
|
|
aSc->RelevantLinkVisited());
|
|
}
|
|
return colors[0];
|
|
}
|
|
|
|
static nscolor ExtractColor(const ComputedStyle& aStyle,
|
|
const StyleRGBA& aColor) {
|
|
return aColor.ToColor();
|
|
}
|
|
|
|
static nscolor ExtractColor(const ComputedStyle& aStyle,
|
|
const StyleColor& aColor) {
|
|
return aColor.CalcColor(aStyle);
|
|
}
|
|
|
|
// Currently caret-color, the only property in the list which is a ColorOrAuto,
|
|
// always maps auto to currentcolor.
|
|
static nscolor ExtractColor(const ComputedStyle& aStyle,
|
|
const StyleColorOrAuto& aColor) {
|
|
if (aColor.IsAuto()) {
|
|
return ExtractColor(aStyle, StyleColor::CurrentColor());
|
|
}
|
|
return ExtractColor(aStyle, aColor.AsColor());
|
|
}
|
|
|
|
static nscolor ExtractColor(ComputedStyle& aStyle,
|
|
const nsStyleSVGPaint& aPaintServer) {
|
|
return aPaintServer.Type() == eStyleSVGPaintType_Color
|
|
? aPaintServer.GetColor(&aStyle)
|
|
: NS_RGBA(0, 0, 0, 0);
|
|
}
|
|
|
|
#define STYLE_FIELD(struct_, field_) aField == &struct_::field_ ||
|
|
#define STYLE_STRUCT(name_, fields_) \
|
|
template <> \
|
|
nscolor ComputedStyle::GetVisitedDependentColor( \
|
|
decltype(nsStyle##name_::MOZ_ARG_1 fields_) nsStyle##name_::*aField) { \
|
|
MOZ_ASSERT(MOZ_FOR_EACH(STYLE_FIELD, (nsStyle##name_, ), fields_) false, \
|
|
"Getting visited-dependent color for a field in nsStyle" #name_ \
|
|
" which is not listed in nsCSSVisitedDependentPropList.h"); \
|
|
return GetVisitedDependentColorInternal( \
|
|
this, [aField](ComputedStyle* sc) { \
|
|
return ExtractColor(*sc, sc->Style##name_()->*aField); \
|
|
}); \
|
|
}
|
|
#include "nsCSSVisitedDependentPropList.h"
|
|
#undef STYLE_STRUCT
|
|
#undef STYLE_FIELD
|
|
|
|
struct ColorIndexSet {
|
|
uint8_t colorIndex, alphaIndex;
|
|
};
|
|
|
|
static const ColorIndexSet gVisitedIndices[2] = {{0, 0}, {1, 0}};
|
|
|
|
/* static */
|
|
nscolor ComputedStyle::CombineVisitedColors(nscolor* aColors,
|
|
bool aLinkIsVisited) {
|
|
if (NS_GET_A(aColors[1]) == 0) {
|
|
// If the style-if-visited is transparent, then just use the
|
|
// unvisited style rather than using the (meaningless) color
|
|
// components of the visited style along with a potentially
|
|
// non-transparent alpha value.
|
|
aLinkIsVisited = false;
|
|
}
|
|
|
|
// NOTE: We want this code to have as little timing dependence as
|
|
// possible on whether this->RelevantLinkVisited() is true.
|
|
const ColorIndexSet& set = gVisitedIndices[aLinkIsVisited ? 1 : 0];
|
|
|
|
nscolor colorColor = aColors[set.colorIndex];
|
|
nscolor alphaColor = aColors[set.alphaIndex];
|
|
return NS_RGBA(NS_GET_R(colorColor), NS_GET_G(colorColor),
|
|
NS_GET_B(colorColor), NS_GET_A(alphaColor));
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
/* static */ const char* ComputedStyle::StructName(StyleStructID aSID) {
|
|
switch (aSID) {
|
|
# define STYLE_STRUCT(name_) \
|
|
case StyleStructID::name_: \
|
|
return #name_;
|
|
# include "nsStyleStructList.h"
|
|
# undef STYLE_STRUCT
|
|
default:
|
|
return "Unknown";
|
|
}
|
|
}
|
|
|
|
/* static */
|
|
Maybe<StyleStructID> ComputedStyle::LookupStruct(const nsACString& aName) {
|
|
# define STYLE_STRUCT(name_) \
|
|
if (aName.EqualsLiteral(#name_)) return Some(StyleStructID::name_);
|
|
# include "nsStyleStructList.h"
|
|
# undef STYLE_STRUCT
|
|
return Nothing();
|
|
}
|
|
#endif // DEBUG
|
|
|
|
ComputedStyle* ComputedStyle::GetCachedLazyPseudoStyle(
|
|
PseudoStyleType aPseudo) const {
|
|
MOZ_ASSERT(PseudoStyle::IsPseudoElement(aPseudo));
|
|
|
|
if (nsCSSPseudoElements::PseudoElementSupportsUserActionState(aPseudo)) {
|
|
return nullptr;
|
|
}
|
|
|
|
return mCachedInheritingStyles.Lookup(aPseudo);
|
|
}
|
|
|
|
MOZ_DEFINE_MALLOC_ENCLOSING_SIZE_OF(ServoComputedValuesMallocEnclosingSizeOf)
|
|
|
|
void ComputedStyle::AddSizeOfIncludingThis(nsWindowSizes& aSizes,
|
|
size_t* aCVsSize) const {
|
|
// Note: |this| sits within a servo_arc::Arc, i.e. it is preceded by a
|
|
// refcount. So we need to measure it with a function that can handle an
|
|
// interior pointer. We use ServoComputedValuesMallocEnclosingSizeOf to
|
|
// clearly identify in DMD's output the memory measured here.
|
|
*aCVsSize += ServoComputedValuesMallocEnclosingSizeOf(this);
|
|
mSource.AddSizeOfExcludingThis(aSizes);
|
|
mCachedInheritingStyles.AddSizeOfIncludingThis(aSizes, aCVsSize);
|
|
}
|
|
|
|
} // namespace mozilla
|