Add a layer (FBO) cache.
The cache is used to draw layers so that a new
texture does not have to be recreated every time
a call to saveLayer() happens.
The FBO cache used a KeyedVector, which is a bad
idea. The cache should be able to store several
FBOs of the same size (this happens a lot during
scrolling with fading edges for instance.) This
will be changed in a future CL.
Change-Id: Ic316189e625f0dbcf0d273a71cc981a433d48726
diff --git a/libs/hwui/LayerCache.h b/libs/hwui/LayerCache.h
new file mode 100644
index 0000000..3696848
--- /dev/null
+++ b/libs/hwui/LayerCache.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_UI_LAYER_CACHE_H
+#define ANDROID_UI_LAYER_CACHE_H
+
+#include "Layer.h"
+#include "GenerationCache.h"
+
+namespace android {
+namespace uirenderer {
+
+class LayerCache: public OnEntryRemoved<LayerSize, Layer*> {
+public:
+ LayerCache(uint32_t maxByteSize);
+ ~LayerCache();
+
+ /**
+ * Used as a callback when an entry is removed from the cache.
+ * Do not invoke directly.
+ */
+ void operator()(LayerSize& bitmap, Layer*& texture);
+
+ /**
+ * Returns the layer of specified dimensions, NULL if cannot be found.
+ */
+ Layer* get(LayerSize& size);
+ /**
+ * Adds the layer to the cache. The layer will not be added if there is
+ * not enough space available.
+ *
+ * @return True if the layer was added, false otherwise.
+ */
+ bool put(LayerSize& size, Layer* layer);
+ /**
+ * Clears the cache. This causes all layers to be deleted.
+ */
+ void clear();
+
+ /**
+ * Sets the maximum size of the cache in bytes.
+ */
+ void setMaxSize(uint32_t maxSize);
+ /**
+ * Returns the maximum size of the cache in bytes.
+ */
+ uint32_t getMaxSize();
+ /**
+ * Returns the current size of the cache in bytes.
+ */
+ uint32_t getSize();
+
+private:
+ void deleteLayer(Layer* layer);
+
+ GenerationCache<LayerSize, Layer*> mCache;
+
+ uint32_t mSize;
+ uint32_t mMaxSize;
+}; // class LayerCache
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_LAYER_CACHE_H