Add support for linear gradients.
Change-Id: Id15329da065045b3f06fdaed615f33cd57608496
diff --git a/libs/hwui/GradientCache.h b/libs/hwui/GradientCache.h
new file mode 100644
index 0000000..12c8a23
--- /dev/null
+++ b/libs/hwui/GradientCache.h
@@ -0,0 +1,89 @@
+/*
+ * 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_GRADIENT_CACHE_H
+#define ANDROID_UI_GRADIENT_CACHE_H
+
+#include <SkShader.h>
+
+#include "Texture.h"
+#include "GenerationCache.h"
+
+namespace android {
+namespace uirenderer {
+
+/**
+ * A simple LRU gradient cache. The cache has a maximum size expressed in bytes.
+ * Any texture added to the cache causing the cache to grow beyond the maximum
+ * allowed size will also cause the oldest texture to be kicked out.
+ */
+class GradientCache: public OnEntryRemoved<SkShader*, Texture*> {
+public:
+ GradientCache(uint32_t maxByteSize);
+ ~GradientCache();
+
+ /**
+ * Used as a callback when an entry is removed from the cache.
+ * Do not invoke directly.
+ */
+ void operator()(SkShader*& shader, Texture*& texture);
+
+ /**
+ * Adds a new linear gradient to the cache. The generated texture is
+ * returned.
+ */
+ Texture* addLinearGradient(SkShader* shader, float* bounds, uint32_t* colors,
+ float* positions, int count, SkShader::TileMode tileMode);
+ /**
+ * Returns the texture associated with the specified shader.
+ */
+ Texture* get(SkShader* shader);
+ /**
+ * Removes the texture associated with the specified shader. Returns NULL
+ * if the texture cannot be found. Upon remove the texture is freed.
+ */
+ void remove(SkShader* shader);
+ /**
+ * Clears the cache. This causes all textures 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 generateTexture(SkBitmap* bitmap, Texture* texture);
+
+ GenerationCache<SkShader*, Texture*> mCache;
+
+ uint32_t mSize;
+ uint32_t mMaxSize;
+}; // class GradientCache
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_GRADIENT_CACHE_H