1 files changed, 166 insertions, 0 deletions
diff --git a/libs/hwui/RenderBufferCache.cpp b/libs/hwui/RenderBufferCache.cpp
new file mode 100644
index 000000000000..830a13ab28a7
--- /dev/null
+++ b/libs/hwui/RenderBufferCache.cpp
@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2013 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 <utils/Log.h>
+
+#include "Debug.h"
+#include "Properties.h"
+#include "RenderBufferCache.h"
+
+namespace android {
+namespace uirenderer {
+
+///////////////////////////////////////////////////////////////////////////////
+// Defines
+///////////////////////////////////////////////////////////////////////////////
+
+// Debug
+#if DEBUG_RENDER_BUFFERS
+    #define RENDER_BUFFER_LOGD(...) ALOGD(__VA_ARGS__)
+#else
+    #define RENDER_BUFFER_LOGD(...)
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+// Constructors/destructor
+///////////////////////////////////////////////////////////////////////////////
+
+RenderBufferCache::RenderBufferCache(): mSize(0), mMaxSize(MB(DEFAULT_RENDER_BUFFER_CACHE_SIZE)) {
+    char property[PROPERTY_VALUE_MAX];
+    if (property_get(PROPERTY_RENDER_BUFFER_CACHE_SIZE, property, NULL) > 0) {
+        INIT_LOGD("  Setting render buffer cache size to %sMB", property);
+        setMaxSize(MB(atof(property)));
+    } else {
+        INIT_LOGD("  Using default render buffer cache size of %.2fMB",
+                DEFAULT_RENDER_BUFFER_CACHE_SIZE);
+    }
+}
+
+RenderBufferCache::~RenderBufferCache() {
+    clear();
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Size management
+///////////////////////////////////////////////////////////////////////////////
+
+uint32_t RenderBufferCache::getSize() {
+    return mSize;
+}
+
+uint32_t RenderBufferCache::getMaxSize() {
+    return mMaxSize;
+}
+
+void RenderBufferCache::setMaxSize(uint32_t maxSize) {
+    clear();
+    mMaxSize = maxSize;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Caching
+///////////////////////////////////////////////////////////////////////////////
+
+int RenderBufferCache::RenderBufferEntry::compare(
+        const RenderBufferCache::RenderBufferEntry& lhs,
+        const RenderBufferCache::RenderBufferEntry& rhs) {
+    int deltaInt = int(lhs.mWidth) - int(rhs.mWidth);
+    if (deltaInt != 0) return deltaInt;
+
+    deltaInt = int(lhs.mHeight) - int(rhs.mHeight);
+    if (deltaInt != 0) return deltaInt;
+
+    return int(lhs.mFormat) - int(rhs.mFormat);
+}
+
+void RenderBufferCache::deleteBuffer(RenderBuffer* buffer) {
+    if (buffer) {
+        RENDER_BUFFER_LOGD("Deleted %s render buffer (%dx%d)",
+                RenderBuffer::formatName(buffer->getFormat()),
+                buffer->getWidth(), buffer->getHeight());
+
+        mSize -= buffer->getSize();
+        delete buffer;
+    }
+}
+
+void RenderBufferCache::clear() {
+    size_t count = mCache.size();
+    for (size_t i = 0; i < count; i++) {
+        deleteBuffer(mCache.itemAt(i).mBuffer);
+    }
+    mCache.clear();
+}
+
+RenderBuffer* RenderBufferCache::get(GLenum format, const uint32_t width, const uint32_t height) {
+    RenderBuffer* buffer = NULL;
+
+    RenderBufferEntry entry(format, width, height);
+    ssize_t index = mCache.indexOf(entry);
+
+    if (index >= 0) {
+        entry = mCache.itemAt(index);
+        mCache.removeAt(index);
+
+        buffer = entry.mBuffer;
+        mSize -= buffer->getSize();
+
+        RENDER_BUFFER_LOGD("Found %s render buffer (%dx%d)",
+                RenderBuffer::formatName(format), width, height);
+    } else {
+        buffer = new RenderBuffer(format, width, height);
+
+        RENDER_BUFFER_LOGD("Created new %s render buffer (%dx%d)",
+                RenderBuffer::formatName(format), width, height);
+    }
+
+    buffer->bind();
+    buffer->allocate();
+
+    return buffer;
+}
+
+bool RenderBufferCache::put(RenderBuffer* buffer) {
+    if (!buffer) return false;
+
+    const uint32_t size = buffer->getSize();
+    if (size < mMaxSize) {
+        while (mSize + size > mMaxSize) {
+            size_t position = 0;
+
+            RenderBuffer* victim = mCache.itemAt(position).mBuffer;
+            deleteBuffer(victim);
+            mCache.removeAt(position);
+        }
+
+        RenderBufferEntry entry(buffer);
+
+        mCache.add(entry);
+        mSize += size;
+
+        RENDER_BUFFER_LOGD("Added %s render buffer (%dx%d)",
+                RenderBuffer::formatName(buffer->getFormat()),
+                buffer->getWidth(), buffer->getHeight());
+
+        return true;
+    }
+    return false;
+}
+
+}; // namespace uirenderer
+}; // namespace android