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Bug 749186, Followup Patch 1: Cache font inflation settings in pres shell to prevent crash. [r=dbaron]

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--HG--
extra : rebase_source : dc8b8f66bcd49c54ecefdf94793100b7901e6f3b
This commit is contained in:
Scott Johnson 2012-06-05 22:47:33 -05:00
parent 797d753fce
commit 6c704020bd
6 changed files with 78 additions and 29 deletions
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50
dom/base/nsDOMWindowUtils.cpp
View File

@ -260,30 +260,32 @@ static void DestroyNsRect(void* aObject, nsIAtom* aPropertyName,
static void
MaybeReflowForInflationScreenWidthChange(nsPresContext *aPresContext)
{
if (aPresContext &&
nsLayoutUtils::FontSizeInflationEnabled(aPresContext) &&
nsLayoutUtils::FontSizeInflationMinTwips() != 0) {
bool changed;
aPresContext->ScreenWidthInchesForFontInflation(&changed);
if (changed) {
nsCOMPtr<nsISupports> container = aPresContext->GetContainer();
nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(container);
if (docShell) {
nsCOMPtr<nsIContentViewer> cv;
docShell->GetContentViewer(getter_AddRefs(cv));
nsCOMPtr<nsIMarkupDocumentViewer> mudv = do_QueryInterface(cv);
if (mudv) {
nsTArray<nsCOMPtr<nsIMarkupDocumentViewer> > array;
mudv->AppendSubtree(array);
for (PRUint32 i = 0, iEnd = array.Length(); i < iEnd; ++i) {
nsCOMPtr<nsIPresShell> shell;
nsCOMPtr<nsIContentViewer> cv = do_QueryInterface(array[i]);
cv->GetPresShell(getter_AddRefs(shell));
if (shell) {
nsIFrame *rootFrame = shell->GetRootFrame();
if (rootFrame) {
shell->FrameNeedsReflow(rootFrame, nsIPresShell::eResize,
NS_FRAME_IS_DIRTY);
if (aPresContext) {
nsIPresShell* presShell = aPresContext->GetPresShell();
if (presShell && nsLayoutUtils::FontSizeInflationEnabled(aPresContext) &&
presShell->FontSizeInflationMinTwips() != 0) {
bool changed;
aPresContext->ScreenWidthInchesForFontInflation(&changed);
if (changed) {
nsCOMPtr<nsISupports> container = aPresContext->GetContainer();
nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(container);
if (docShell) {
nsCOMPtr<nsIContentViewer> cv;
docShell->GetContentViewer(getter_AddRefs(cv));
nsCOMPtr<nsIMarkupDocumentViewer> mudv = do_QueryInterface(cv);
if (mudv) {
nsTArray<nsCOMPtr<nsIMarkupDocumentViewer> > array;
mudv->AppendSubtree(array);
for (PRUint32 i = 0, iEnd = array.Length(); i < iEnd; ++i) {
nsCOMPtr<nsIPresShell> shell;
nsCOMPtr<nsIContentViewer> cv = do_QueryInterface(array[i]);
cv->GetPresShell(getter_AddRefs(shell));
if (shell) {
nsIFrame *rootFrame = shell->GetRootFrame();
if (rootFrame) {
shell->FrameNeedsReflow(rootFrame, nsIPresShell::eResize,
NS_FRAME_IS_DIRTY);
}
}
}
}

21
layout/base/nsIPresShell.h
View File

@ -1236,6 +1236,21 @@ public:
size_t *aTextRunsSize,
size_t *aPresContextSize) const = 0;
/**
* Methods that retrieve the cached font inflation preferences.
*/
PRUint32 FontSizeInflationEmPerLine() const {
return mFontSizeInflationEmPerLine;
}
PRUint32 FontSizeInflationMinTwips() const {
return mFontSizeInflationMinTwips;
}
PRUint32 FontSizeInflationLineThreshold() const {
return mFontSizeInflationLineThreshold;
}
/**
* Refresh observer management.
*/
@ -1362,6 +1377,12 @@ protected:
bool mScrollPositionClampingScrollPortSizeSet : 1;
static nsIContent* gKeyDownTarget;
// Cached font inflation values. This is done to prevent changing of font
// inflation until a page is reloaded.
PRUint32 mFontSizeInflationEmPerLine;
PRUint32 mFontSizeInflationMinTwips;
PRUint32 mFontSizeInflationLineThreshold;
};
/**

13
layout/base/nsLayoutUtils.cpp
View File

@ -4707,8 +4707,10 @@ nsReflowFrameRunnable::Run()
static nscoord
MinimumFontSizeFor(nsPresContext* aPresContext, nscoord aContainerWidth)
{
PRUint32 emPerLine = nsLayoutUtils::FontSizeInflationEmPerLine();
PRUint32 minTwips = nsLayoutUtils::FontSizeInflationMinTwips();
nsIPresShell* presShell = aPresContext->PresShell();
PRUint32 emPerLine = presShell->FontSizeInflationEmPerLine();
PRUint32 minTwips = presShell->FontSizeInflationMinTwips();
if (emPerLine == 0 && minTwips == 0) {
return 0;
}
@ -4859,8 +4861,11 @@ nsLayoutUtils::FontSizeInflationFor(const nsIFrame *aFrame)
/* static */ bool
nsLayoutUtils::FontSizeInflationEnabled(nsPresContext *aPresContext)
{
if ((sFontSizeInflationEmPerLine == 0 &&
sFontSizeInflationMinTwips == 0) ||
nsIPresShell* presShell = aPresContext->GetPresShell();
if (!presShell ||
(presShell->FontSizeInflationEmPerLine() == 0 &&
presShell->FontSizeInflationMinTwips() == 0) ||
aPresContext->IsChrome()) {
return false;
}

11
layout/base/nsPresShell.cpp
View File

@ -872,6 +872,9 @@ PresShell::Init(nsIDocument* aDocument,
// Get our activeness from the docShell.
QueryIsActive();
// Setup our font inflation preferences.
SetupFontInflation();
return NS_OK;
}
@ -8957,3 +8960,11 @@ nsIPresShell::SetScrollPositionClampingScrollPortSize(nscoord aWidth, nscoord aH
mScrollPositionClampingScrollPortSize.width = aWidth;
mScrollPositionClampingScrollPortSize.height = aHeight;
}
void
PresShell::SetupFontInflation()
{
mFontSizeInflationEmPerLine = nsLayoutUtils::FontSizeInflationEmPerLine();
mFontSizeInflationMinTwips = nsLayoutUtils::FontSizeInflationMinTwips();
mFontSizeInflationLineThreshold = nsLayoutUtils::FontSizeInflationLineThreshold();
}

9
layout/base/nsPresShell.h
View File

@ -378,6 +378,15 @@ protected:
// Helper for ScrollContentIntoView
void DoScrollContentIntoView();
/**
* Initialize cached font inflation preference values.
*
* @see nsLayoutUtils::sFontSizeInflationEmPerLine
* @see nsLayoutUtils::sFontSizeInflationMinTwips
* @see nsLayoutUtils::sFontSizeInflationLineThreshold
*/
void SetupFontInflation();
friend struct AutoRenderingStateSaveRestore;
friend struct RenderingState;

3
layout/generic/nsFontInflationData.cpp
View File

@ -194,7 +194,8 @@ nsFontInflationData::UpdateWidth(const nsHTMLReflowState &aReflowState)
// See comment above "font.size.inflation.lineThreshold" in
// modules/libpref/src/init/all.js .
PRUint32 lineThreshold = nsLayoutUtils::FontSizeInflationLineThreshold();
nsIPresShell* presShell = bfc->PresContext()->PresShell();
PRUint32 lineThreshold = presShell->FontSizeInflationLineThreshold();
nscoord newTextThreshold = (newNCAWidth * lineThreshold) / 100;
if (mTextThreshold <= mTextAmount && mTextAmount < newTextThreshold) {