Bug 906643. Part 4: Make each gfxFontEntry track its gfxFonts with SVG glyphs. r=jfkthame

--HG--
extra : rebase_source : cd2cbdc8f6722e71f523c3fbe19e515a0e44f043

gfx/thebes/gfxFont.cpp

@@ -248,7 +248,7 @@ gfxFontEntry::RenderSVGGlyph(gfxContext *aContext, uint32_t aGlyphId,
 }
 
 bool
-gfxFontEntry::TryGetSVGData()
+gfxFontEntry::TryGetSVGData(gfxFont* aFont)
 {
     if (!gfxPlatform::GetPlatform()->OpenTypeSVGEnabled()) {
         return false;
@@ -269,9 +269,19 @@ gfxFontEntry::TryGetSVGData()
         mSVGGlyphs = new gfxSVGGlyphs(svgTable);
     }
 
+    if (!mFontsUsingSVGGlyphs.Contains(aFont)) {
+        mFontsUsingSVGGlyphs.AppendElement(aFont);
+    }
+
     return !!mSVGGlyphs;
 }
 
+void
+gfxFontEntry::NotifyFontDestroyed(gfxFont* aFont)
+{
+    mFontsUsingSVGGlyphs.RemoveElement(aFont);
+}
+
 /**
  * FontTableBlobData
  *
@@ -1713,6 +1723,8 @@ gfxFont::~gfxFont()
     for (i = 0; i < count; ++i) {
         delete mGlyphExtentsArray[i];
     }
+
+    mFontEntry->NotifyFontDestroyed(this);
 }
 
 /*static*/
@@ -2295,7 +2307,7 @@ gfxFont::Draw(gfxTextRun *aTextRun, uint32_t aStart, uint32_t aEnd,
     double direction = aTextRun->GetDirection();
     gfxMatrix globalMatrix = aContext->CurrentMatrix();
 
-    bool haveSVGGlyphs = GetFontEntry()->TryGetSVGData();
+    bool haveSVGGlyphs = GetFontEntry()->TryGetSVGData(this);
     nsAutoPtr<gfxTextContextPaint> contextPaint;
     if (haveSVGGlyphs && !aContextPaint) {
         // If no pattern is specified for fill, use the current pattern
@@ -3389,7 +3401,7 @@ gfxFont::SetupGlyphExtents(gfxContext *aContext, uint32_t aGlyphID, bool aNeedTi
     aContext->IdentityMatrix();
 
     gfxRect svgBounds;
-    if (mFontEntry->TryGetSVGData() && mFontEntry->HasSVGGlyph(aGlyphID) &&
+    if (mFontEntry->TryGetSVGData(this) && mFontEntry->HasSVGGlyph(aGlyphID) &&
         mFontEntry->GetSVGGlyphExtents(aContext, aGlyphID, &svgBounds)) {
         gfxFloat d2a = aExtents->GetAppUnitsPerDevUnit();
         aExtents->SetTightGlyphExtents(aGlyphID,

gfx/thebes/gfxFont.h

@@ -324,7 +324,7 @@ public:
     // can be safely dereferenced.
     virtual nsresult ReadCMAP();
 
-    bool TryGetSVGData();
+    bool TryGetSVGData(gfxFont* aFont);
     bool HasSVGGlyph(uint32_t aGlyphId);
     bool GetSVGGlyphExtents(gfxContext *aContext, uint32_t aGlyphId,
                             gfxRect *aResult);
@@ -415,6 +415,10 @@ public:
     gr_face* GetGrFace();
     virtual void ReleaseGrFace(gr_face* aFace);
 
+    // Called to notify that aFont is being destroyed. Needed when we're tracking
+    // the fonts belonging to this font entry.
+    void NotifyFontDestroyed(gfxFont* aFont);
+    
     // For memory reporting
     virtual void SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
                                      FontListSizes*    aSizes) const;
@@ -457,7 +461,8 @@ public:
     nsAutoArrayPtr<uint8_t> mUVSData;
     gfxUserFontData* mUserFontData;
     gfxSVGGlyphs    *mSVGGlyphs;
-
+    // list of gfxFonts that are using SVG glyphs
+    nsTArray<gfxFont*> mFontsUsingSVGGlyphs;
     nsTArray<gfxFontFeature> mFeatureSettings;
     uint32_t         mLanguageOverride;