Fix native memory leak caused by small HWUI path cache creation
HWUI calculates the texture size as w*h*bpp. In some cases, the
calculated path cache is small, but the actual memory allocated
in driver is 4k/8k/16k, much bigger than HWUI calculates.
Example: a 5*65 alpha texture, HWUI think it is 5*65*1 = 325 bytes,
but driver allocates 8K. An app can allocates up to 32M path textures,
which actually consumes 32M*(8*1024/325) = 806M memory.
Here we limit the number of path texture in the cache to 256, it
should be a pretty generous global limit.
Change-Id: I890819b73bb0b7f63e96bc3d9d0ff9469c16838c
diff --git a/libs/hwui/Properties.h b/libs/hwui/Properties.h
index 5dea493..64dcc7d 100644
--- a/libs/hwui/Properties.h
+++ b/libs/hwui/Properties.h
@@ -249,6 +249,9 @@
#define DEFAULT_TEXT_BLACK_GAMMA_THRESHOLD 64
#define DEFAULT_TEXT_WHITE_GAMMA_THRESHOLD 192
+// cap to 256 to limite paths in the path cache
+#define DEFAULT_PATH_TEXTURE_CAP 256
+
///////////////////////////////////////////////////////////////////////////////
// Misc
///////////////////////////////////////////////////////////////////////////////