Memory optimizations for libhwui

Bug #5566149

Lazily initialize font renderers
Keep 60% of the texture cache when an app goes to the background
Delete least used font renderer when going to the background
Delete all font renderers on full memory trim

Change-Id: I3c2454d46dc1107ec0f0f72a9ce69cbbcc8825e7

1 files changed, 13 insertions, 0 deletions

diff --git a/libs/hwui/TextureCache.h b/libs/hwui/TextureCache.h
index f7707f7ae8e8..ce924b4cbb6f 100644
--- a/libs/hwui/TextureCache.h
+++ b/libs/hwui/TextureCache.h
@@ -98,6 +98,17 @@ public:
      */
     uint32_t getSize();
 
+    /**
+     * Partially flushes the cache. The amount of memory freed by a flush
+     * is defined by the flush rate.
+     */
+    void flush();
+    /**
+     * Indicates the percentage of the cache to retain when a
+     * memory trim is requested (see Caches::flush).
+     */
+    void setFlushRate(float flushRate);
+
 private:
     /**
      * Generates the texture from a bitmap into the specified texture structure.
@@ -119,6 +130,8 @@ private:
     uint32_t mMaxSize;
     GLint mMaxTextureSize;
 
+    float mFlushRate;
+
     bool mDebugEnabled;
 
     Vector<SkBitmap*> mGarbage;