Magic-Mirror/gecko-dev
1
0
Fork 0
mirror of https://github.com/mozilla/gecko-dev.git synced 2024-10-28 12:45:27 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
878b529707
gecko-dev/layout/style/ComputedStyle.cpp
Markus Stange 878b529707 Bug 1462784 - Rename the CSS category to LAYOUT. r=njn 
The next changeset is going to move over more annotations that Gecko developers
would count as "layout" into the LAYOUT category, and which is currently marked
as GRAPHICS.
We can add a subcategory for style resolution once we have subcategories, but
for now I think it makes more sense to put style resolution into the same bucket
as reflow and display list building.

MozReview-Commit-ID: 7r9eICVBA1Z

--HG--
extra : rebase_source : ce2df7a07522e99b0ccb59e40a8eae590ebfe834
2018-05-18 17:40:52 -04:00

427 lines
17 KiB
C++
Raw Blame History

/* -*- 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 "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 "nsIPresShell.h"
#include "GeckoProfiler.h"
#include "nsIDocument.h"
#include "nsPrintfCString.h"
#include "RubyUtils.h"
#include "mozilla/ArenaObjectID.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(nsPresContext* aPresContext,
nsAtom* aPseudoTag,
CSSPseudoElementType aPseudoType,
ServoComputedDataForgotten aComputedValues)
: mPresContext(aPresContext)
, mSource(aComputedValues)
, mPseudoTag(aPseudoTag)
, mBits(static_cast<Bit>(Servo_ComputedValues_GetStyleBits(this)))
, mPseudoType(aPseudoType)
{
MOZ_ASSERT(ComputedData());
}
nsChangeHint
ComputedStyle::CalcStyleDifference(ComputedStyle* aNewContext,
uint32_t* aEqualStructs)
{
MOZ_ASSERT(aNewContext);
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 PEEK(struct_) \
ComputedData()->GetStyle##struct_()
#define EXPAND(...) __VA_ARGS__
#define DO_STRUCT_DIFFERENCE_WITH_ARGS(struct_, extra_args_) \
PR_BEGIN_MACRO \
const nsStyle##struct_* this##struct_ = PEEK(struct_); \
if (this##struct_) { \
structsFound |= STYLE_STRUCT_BIT(struct_); \
\
const nsStyle##struct_* other##struct_ = \
aNewContext->ThreadsafeStyle##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_); \
} \
} \
} else { \
*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(UserInterface);
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, (, PEEK(Display)));
DO_STRUCT_DIFFERENCE(SVGReset);
DO_STRUCT_DIFFERENCE(SVG);
DO_STRUCT_DIFFERENCE_WITH_ARGS(Position, (, PEEK(Visibility)));
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);
DO_STRUCT_DIFFERENCE(Color);
#undef DO_STRUCT_DIFFERENCE
#undef DO_STRUCT_DIFFERENCE_WITH_ARGS
#undef EXPAND
MOZ_ASSERT(styleStructCount == StyleStructConstants::kStyleStructCount,
"missing a call to DO_STRUCT_DIFFERENCE");
#ifdef DEBUG
#define STYLE_STRUCT(name_) \
MOZ_ASSERT(!!(structsFound & STYLE_STRUCT_BIT(name_)) == \
(PEEK(name_) != nullptr), \
"PeekStyleData results must not change in the middle of " \
"difference calculation.");
#include "nsStyleStructList.h"
#undef STYLE_STRUCT
#endif
// 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.
ComputedStyle* thisVis = GetStyleIfVisited();
ComputedStyle* otherVis = aNewContext->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_) \
if (PEEK(name_)) { \
const nsStyle##name_* thisVisStruct = \
thisVis->ThreadsafeStyle##name_(); \
const nsStyle##name_* otherVisStruct = \
otherVis->ThreadsafeStyle##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, nsStyleEffects and
// nsStyleSVGReset, 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.
if (ThreadsafeStyleDisplay()->IsAbsPosContainingBlockForAppropriateFrame(*this) ==
aNewContext->ThreadsafeStyleDisplay()->
IsAbsPosContainingBlockForAppropriateFrame(*aNewContext) &&
ThreadsafeStyleDisplay()->IsFixedPosContainingBlockForAppropriateFrame(*this) ==
aNewContext->ThreadsafeStyleDisplay()->
IsFixedPosContainingBlockForAppropriateFrame(*aNewContext)) {
// While some styles that cause the frame to be a containing block
// has changed, the overall result hasn't.
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 (mPseudoTag) {
nsAutoString buffer;
mPseudoTag->ToString(buffer);
AppendUTF16toUTF8(buffer, str);
str.Append(' ');
}
fprintf_stderr(out, "%s{ServoComputedData}\n", str.get());
}
#endif
nsIPresShell*
ComputedStyle::Arena()
{
return mPresContext->PresShell();
}
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(ComputedStyle* aStyle, const nscolor& aColor)
{
return aColor;
}
static nscolor
ExtractColor(ComputedStyle* aStyle, const StyleComplexColor& aColor)
{
return aColor.CalcColor(aStyle);
}
static nscolor
ExtractColor(ComputedStyle* aStyle, const nsStyleSVGPaint& aPaintServer)
{
return aPaintServer.Type() == eStyleSVGPaintType_Color
? aPaintServer.GetColor() : 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(CSSPseudoElementType aPseudo) const
{
MOZ_ASSERT(aPseudo != CSSPseudoElementType::NotPseudo &&
aPseudo != CSSPseudoElementType::InheritingAnonBox &&
aPseudo != CSSPseudoElementType::NonInheritingAnonBox);
MOZ_ASSERT(!IsLazilyCascadedPseudoElement(), "Lazy pseudos can't inherit lazy pseudos");
if (nsCSSPseudoElements::PseudoElementSupportsUserActionState(aPseudo)) {
return nullptr;
}
return mCachedInheritingStyles.Lookup(nsCSSPseudoElements::GetPseudoAtom(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
Reference in New Issue View Git Blame Copy Permalink