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Bug 1149542 - Part 2: Track undisplayed characters before empty text frames properly. r=dholbert

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This commit is contained in:
Cameron McCormack 2015-04-06 09:12:06 -04:00
parent ab6dc93a51
commit 2828a1df64
1 changed files with 18 additions and 15 deletions
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19
layout/svg/SVGTextFrame.cpp
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@ -290,22 +290,25 @@ GetNonEmptyTextFrameAndNode(nsIFrame* aFrame,
nsTextNode*& aTextNode)
{
nsTextFrame* text = do_QueryFrame(aFrame);
if (!text) {
return false;
}
bool isNonEmptyTextFrame = text && text->GetContentLength() != 0;
if (isNonEmptyTextFrame) {
nsIContent* content = text->GetContent();
NS_ASSERTION(content && content->IsNodeOfType(nsINode::eTEXT),
"unexpected content type for nsTextFrame");
nsTextNode* node = static_cast<nsTextNode*>(content);
if (node->TextLength() == 0) {
return false;
}
MOZ_ASSERT(node->TextLength() != 0,
"frame's GetContentLength() should be 0 if the text node "
"has no content");
aTextFrame = text;
aTextNode = node;
return true;
}
MOZ_ASSERT(IsNonEmptyTextFrame(aFrame) == isNonEmptyTextFrame,
"our logic should agree with IsNonEmptyTextFrame");
return isNonEmptyTextFrame;
}
/**
@ -1308,7 +1311,7 @@ GetUndisplayedCharactersBeforeFrame(nsTextFrame* aFrame)
/**
* Traverses the nsTextFrames for an SVGTextFrame and records a
* TextNodeCorrespondenceProperty on each for the number of undisplayed DOM
* characters between each frame. This is done by iterating simultaenously
* characters between each frame. This is done by iterating simultaneously
* over the nsTextNodes and nsTextFrames and noting when nsTextNodes (or
* parts of them) are skipped when finding the next nsTextFrame.
*/