Fix bug #6408393 Character corruption is caused when locale is changed

- free the TextLayoutCache on Locale change

- also free TextLayoutCache when memory is low

Change-Id: I39a37ac8ec3c292cfb1c0eea4bb41ff71897d089

3 files changed, 18 insertions, 2 deletions

diff --git a/core/jni/android/graphics/Canvas.cpp b/core/jni/android/graphics/Canvas.cpp
index ef6af74..6b74705 100644
--- a/core/jni/android/graphics/Canvas.cpp
+++ b/core/jni/android/graphics/Canvas.cpp
@@ -69,7 +69,11 @@ public:
         SkImageRef_GlobalPool::SetRAMUsed(0);
         SkGraphics::PurgeFontCache();
     }
-    
+
+    static void freeTextLayoutCaches(JNIEnv* env, jobject) {
+        TextLayoutEngine::getInstance().purgeCaches();
+    }
+
     static jboolean isOpaque(JNIEnv* env, jobject jcanvas) {
         NPE_CHECK_RETURN_ZERO(env, jcanvas);
         SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, jcanvas);
@@ -986,7 +990,9 @@ static JNINativeMethod gCanvasMethods[] = {
         (void*) SkCanvasGlue::drawTextOnPath__StringPathFFPaint},
     {"native_drawPicture", "(II)V", (void*) SkCanvasGlue::drawPicture},
 
-    {"freeCaches", "()V", (void*) SkCanvasGlue::freeCaches}
+    {"freeCaches", "()V", (void*) SkCanvasGlue::freeCaches},
+
+    {"freeTextLayoutCaches", "()V", (void*) SkCanvasGlue::freeTextLayoutCaches}
 };
 
 ///////////////////////////////////////////////////////////////////////////////
diff --git a/core/jni/android/graphics/TextLayoutCache.cpp b/core/jni/android/graphics/TextLayoutCache.cpp
index 2c38893..71c7ab0 100644
--- a/core/jni/android/graphics/TextLayoutCache.cpp
+++ b/core/jni/android/graphics/TextLayoutCache.cpp
@@ -991,4 +991,11 @@ sp<TextLayoutValue> TextLayoutEngine::getValue(const SkPaint* paint, const jchar
     return value;
 }
 
+void TextLayoutEngine::purgeCaches() {
+#if USE_TEXT_LAYOUT_CACHE
+    mTextLayoutCache->clear();
+#endif
+}
+
+
 } // namespace android
diff --git a/core/jni/android/graphics/TextLayoutCache.h b/core/jni/android/graphics/TextLayoutCache.h
index 7d7caac..7308367 100644
--- a/core/jni/android/graphics/TextLayoutCache.h
+++ b/core/jni/android/graphics/TextLayoutCache.h
@@ -309,6 +309,9 @@ public:
 
     sp<TextLayoutValue> getValue(const SkPaint* paint, const jchar* text, jint start,
             jint count, jint contextCount, jint dirFlags);
+
+    void purgeCaches();
+
 private:
     TextLayoutCache* mTextLayoutCache;
     TextLayoutShaper* mShaper;