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Fix crash when attempting to use a font fallback chain with a custom font.

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This is a cherry-pick of a CL that has already been merged into Android.

Review URL: https://codereview.chromium.org/16005011

git-svn-id: http://skia.googlecode.com/svn/trunk@9468 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
djsollen@google.com 2013-06-06 21:25:09 +00:00
parent 2c84aa3598
commit e47e7d17a6
1 changed files with 12 additions and 6 deletions
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18
src/ports/SkFontConfigInterface_android.cpp
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@ -569,18 +569,24 @@ SkTypeface* SkFontConfigInterfaceAndroid::nextLogicalTypeface(SkFontID currFontI
return NULL;
}
const SkTypeface* currTypeface = SkTypefaceCache::FindByID(currFontID);
SkASSERT(currTypeface != 0);
FallbackFontList* currentFallbackList = findFallbackFontList(opts.getLanguage());
SkASSERT(currentFallbackList);
// we must convert currTypeface into a FontRecID
FontRecID currFontRecID = ((FontConfigTypeface*)currTypeface)->getIdentity().fID;
SkASSERT(INVALID_FONT_REC_ID != currFontRecID);
FontRecID currFontRecID = INVALID_FONT_REC_ID;
const SkTypeface* currTypeface = SkTypefaceCache::FindByID(currFontID);
// non-system fonts are not in the font cache so if we are asked to fallback
// for a non-system font we will start at the front of the chain.
if (NULL != currTypeface && currFontID == origFontID) {
currFontRecID = ((FontConfigTypeface*)currTypeface)->getIdentity().fID;
SkASSERT(INVALID_FONT_REC_ID != currFontRecID);
}
// TODO lookup the index next font in the chain
// lookup the index next font in the chain
int currFallbackFontIndex = currentFallbackList->find(currFontRecID);
// We add 1 to the returned index for 2 reasons: (1) if find succeeds it moves
// our index to the next entry in the list; (2) if find() fails it returns
// -1 and incrementing it will set our starting index to 0 (the head of the list)
int nextFallbackFontIndex = currFallbackFontIndex + 1;
if(nextFallbackFontIndex >= currentFallbackList->count()) {