1 files changed, 158 insertions, 0 deletions
diff --git a/libs/hwui/LayerCache.cpp b/libs/hwui/LayerCache.cpp
new file mode 100644
index 0000000..9ce0359
--- /dev/null
+++ b/libs/hwui/LayerCache.cpp
@@ -0,0 +1,158 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "OpenGLRenderer"
+
+#include <GLES2/gl2.h>
+
+#include <utils/Log.h>
+
+#include "LayerCache.h"
+#include "Properties.h"
+
+namespace android {
+namespace uirenderer {
+
+///////////////////////////////////////////////////////////////////////////////
+// Constructors/destructor
+///////////////////////////////////////////////////////////////////////////////
+
+LayerCache::LayerCache(): mSize(0), mMaxSize(MB(DEFAULT_LAYER_CACHE_SIZE)) {
+    char property[PROPERTY_VALUE_MAX];
+    if (property_get(PROPERTY_LAYER_CACHE_SIZE, property, NULL) > 0) {
+        LOGD("  Setting layer cache size to %sMB", property);
+        setMaxSize(MB(atof(property)));
+    } else {
+        LOGD("  Using default layer cache size of %.2fMB", DEFAULT_LAYER_CACHE_SIZE);
+    }
+}
+
+LayerCache::~LayerCache() {
+    clear();
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Size management
+///////////////////////////////////////////////////////////////////////////////
+
+uint32_t LayerCache::getSize() {
+    return mSize;
+}
+
+uint32_t LayerCache::getMaxSize() {
+    return mMaxSize;
+}
+
+void LayerCache::setMaxSize(uint32_t maxSize) {
+    clear();
+    mMaxSize = maxSize;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Caching
+///////////////////////////////////////////////////////////////////////////////
+
+void LayerCache::deleteLayer(Layer* layer) {
+    if (layer) {
+        mSize -= layer->width * layer->height * 4;
+        glDeleteTextures(1, &layer->texture);
+        delete layer;
+    }
+}
+
+void LayerCache::clear() {
+    size_t count = mCache.size();
+    for (size_t i = 0; i < count; i++) {
+        deleteLayer(mCache.itemAt(i).mLayer);
+    }
+    mCache.clear();
+}
+
+Layer* LayerCache::get(const uint32_t width, const uint32_t height) {
+    Layer* layer = NULL;
+
+    LayerEntry entry(width, height);
+    ssize_t index = mCache.indexOf(entry);
+
+    if (index >= 0) {
+        entry = mCache.itemAt(index);
+        mCache.removeAt(index);
+
+        layer = entry.mLayer;
+        mSize -= layer->width * layer->height * 4;
+
+        LAYER_LOGD("Reusing layer %dx%d", layer->width, layer->height);
+    } else {
+        LAYER_LOGD("Creating new layer %dx%d", entry.mWidth, entry.mHeight);
+
+        layer = new Layer(entry.mWidth, entry.mHeight);
+        layer->blend = true;
+        layer->empty = true;
+        layer->fbo = 0;
+
+        glGenTextures(1, &layer->texture);
+        glBindTexture(GL_TEXTURE_2D, layer->texture);
+
+        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+#if DEBUG_LAYERS
+        size_t size = mCache.size();
+        for (size_t i = 0; i < size; i++) {
+            const LayerEntry& entry = mCache.itemAt(i);
+            LAYER_LOGD("  Layer size %dx%d", entry.mWidth, entry.mHeight);
+        }
+#endif
+    }
+
+    return layer;
+}
+
+bool LayerCache::put(Layer* layer) {
+    const uint32_t size = layer->width * layer->height * 4;
+    // Don't even try to cache a layer that's bigger than the cache
+    if (size < mMaxSize) {
+        // TODO: Use an LRU
+        while (mSize + size > mMaxSize) {
+            size_t position = 0;
+#if LAYER_REMOVE_BIGGEST
+            position = mCache.size() - 1;
+#endif
+            Layer* victim = mCache.itemAt(position).mLayer;
+            deleteLayer(victim);
+            mCache.removeAt(position);
+
+            LAYER_LOGD("  Deleting layer %.2fx%.2f", victim->layer.getWidth(),
+                    victim->layer.getHeight());
+        }
+
+        LayerEntry entry(layer);
+
+        mCache.add(entry);
+        mSize += size;
+
+        return true;
+    }
+    return false;
+}
+
+}; // namespace uirenderer
+}; // namespace android