De-allocate caches for large glyphs when trimming memory

Currently, font renderers eliminate some texture caches when
memory is trimmed. This change makes it go further by eliminating the
large-glyph caches for all font renderers. These caches are
only allocated as needed, but continue to consume large amounts of
memory (CPU and GPU) after that allocation. De-allocating this memory
on a trim operation should prevent background apps from holding onto
this memory in the possible case that they have allocated it by drawing
large glyphs.

Change-Id: Id7a3ab49b244e036b442d87252fb40aeca8fdb26

1 files changed, 3 insertions, 1 deletions

diff --git a/libs/hwui/FontRenderer.h b/libs/hwui/FontRenderer.h
index 9f32747..005cdde 100644
--- a/libs/hwui/FontRenderer.h
+++ b/libs/hwui/FontRenderer.h
@@ -180,7 +180,7 @@ protected:
     // Cache of glyphs
     DefaultKeyedVector<glyph_t, CachedGlyphInfo*> mCachedGlyphs;
 
-    void invalidateTextureCache();
+    void invalidateTextureCache(CacheTextureLine *cacheLine = NULL);
 
     CachedGlyphInfo* cacheGlyph(SkPaint* paint, glyph_t glyph);
     void updateGlyphCache(SkPaint* paint, const SkGlyph& skiaGlyph, CachedGlyphInfo *glyph);
@@ -219,6 +219,7 @@ public:
 
     void init();
     void deinit();
+    void flushLargeCaches();
 
     void setGammaTable(const uint8_t* gammaTable) {
         mGammaTable = gammaTable;
@@ -286,6 +287,7 @@ protected:
     const uint8_t* mGammaTable;
 
     void allocateTextureMemory(CacheTexture* cacheTexture);
+    void deallocateTextureMemory(CacheTexture* cacheTexture);
     void initTextTexture();
     CacheTexture *createCacheTexture(int width, int height, bool allocate);
     void cacheBitmap(const SkGlyph& glyph, CachedGlyphInfo* cachedGlyph,