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Bug 1173646 part 3: Make FlexItems cache their WritingMode, for quick access. r=mats

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This commit is contained in:
Daniel Holbert 2015-06-12 14:28:24 -07:00
parent cc4ab0d9dc
commit ec88b067da
1 changed files with 15 additions and 6 deletions
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21
layout/generic/nsFlexContainerFrame.cpp
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@ -327,7 +327,11 @@ public:
const FlexboxAxisTracker& aAxisTracker);
// Simplified constructor, to be used only for generating "struts":
FlexItem(nsIFrame* aChildFrame, nscoord aCrossSize);
// (NOTE: This "strut" constructor uses the *container's* writing mode, which
// we'll use on this FlexItem instead of the child frame's real writing mode.
// This is fine - it doesn't matter what writing mode we use for a
// strut, since it won't render any content and we already know its size.)
FlexItem(nsIFrame* aChildFrame, nscoord aCrossSize, WritingMode aContainerWM);
// Accessors
nsIFrame* Frame() const { return mFrame; }
@ -360,10 +364,9 @@ public:
// will matter more (& can be expanded/tested) once we officially support
// logical directions & vertical writing-modes in flexbox, in bug 1079155
// or a dependency.
WritingMode wm = mFrame->GetWritingMode();
// Use GetFirstLineBaseline(), or just GetBaseline() if that fails.
if (!nsLayoutUtils::GetFirstLineBaseline(wm, mFrame, &mAscent)) {
mAscent = mFrame->GetLogicalBaseline(wm);
if (!nsLayoutUtils::GetFirstLineBaseline(mWM, mFrame, &mAscent)) {
mAscent = mFrame->GetLogicalBaseline(mWM);
}
}
return mAscent;
@ -415,6 +418,7 @@ public:
// visibility:collapse.
bool IsStrut() const { return mIsStrut; }
WritingMode GetWritingMode() const { return mWM; }
uint8_t GetAlignSelf() const { return mAlignSelf; }
// Returns the flex factor (flex-grow or flex-shrink), depending on
@ -693,6 +697,7 @@ protected:
// Does this item need to resolve a min-[width|height]:auto (in main-axis).
bool mNeedsMinSizeAutoResolution;
const WritingMode mWM; // The flex item's writing mode.
uint8_t mAlignSelf; // My "align-self" computed value (with "auto"
// swapped out for parent"s "align-items" value,
// in our constructor).
@ -1554,6 +1559,7 @@ FlexItem::FlexItem(nsHTMLReflowState& aFlexItemReflowState,
mIsStretched(false),
mIsStrut(false),
// mNeedsMinSizeAutoResolution is initialized in CheckForMinSizeAuto()
mWM(aFlexItemReflowState.GetWritingMode()),
mAlignSelf(aFlexItemReflowState.mStylePosition->mAlignSelf)
{
MOZ_ASSERT(mFrame, "expecting a non-null child frame");
@ -1605,7 +1611,8 @@ FlexItem::FlexItem(nsHTMLReflowState& aFlexItemReflowState,
// Simplified constructor for creating a special "strut" FlexItem, for a child
// with visibility:collapse. The strut has 0 main-size, and it only exists to
// impose a minimum cross size on whichever FlexLine it ends up in.
FlexItem::FlexItem(nsIFrame* aChildFrame, nscoord aCrossSize)
FlexItem::FlexItem(nsIFrame* aChildFrame, nscoord aCrossSize,
WritingMode aContainerWM)
: mFrame(aChildFrame),
mFlexGrow(0.0f),
mFlexShrink(0.0f),
@ -1629,6 +1636,7 @@ FlexItem::FlexItem(nsIFrame* aChildFrame, nscoord aCrossSize)
mIsStretched(false),
mIsStrut(true), // (this is the constructor for making struts, after all)
mNeedsMinSizeAutoResolution(false),
mWM(aContainerWM),
mAlignSelf(NS_STYLE_ALIGN_ITEMS_FLEX_START)
{
MOZ_ASSERT(mFrame, "expecting a non-null child frame");
@ -3152,7 +3160,8 @@ nsFlexContainerFrame::GenerateFlexLines(
aStruts[nextStrutIdx].mItemIdx == itemIdxInContainer) {
// Use the simplified "strut" FlexItem constructor:
item = new FlexItem(childFrame, aStruts[nextStrutIdx].mStrutCrossSize);
item = new FlexItem(childFrame, aStruts[nextStrutIdx].mStrutCrossSize,
aReflowState.GetWritingMode());
nextStrutIdx++;
} else {
item = GenerateFlexItemForChild(aPresContext, childFrame,