1 files changed, 151 insertions, 0 deletions
diff --git a/libs/hwui/TextDropShadowCache.h b/libs/hwui/TextDropShadowCache.h
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+++ b/libs/hwui/TextDropShadowCache.h
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+/*
+ * 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_TEXT_DROP_SHADOW_CACHE_H
+#define ANDROID_UI_TEXT_DROP_SHADOW_CACHE_H
+
+#include <GLES2/gl2.h>
+
+#include <SkPaint.h>
+
+#include "utils/GenerationCache.h"
+#include "FontRenderer.h"
+#include "Texture.h"
+
+namespace android {
+namespace uirenderer {
+
+struct ShadowText {
+    ShadowText() {
+        text = NULL;
+    }
+
+    ShadowText(SkPaint* paint, uint32_t radius, uint32_t len, const char* srcText):
+            radius(radius), len(len) {
+        text = new char[len];
+        memcpy(text, srcText, len);
+
+        textSize = paint->getTextSize();
+        typeface = paint->getTypeface();
+
+        hash = 0;
+        uint32_t multiplier = 1;
+        for (uint32_t i = 0; i < len; i++) {
+            hash += text[i] * multiplier;
+            uint32_t shifted = multiplier << 5;
+            multiplier = shifted - multiplier;
+        }
+    }
+
+    ShadowText(const ShadowText& shadow):
+            radius(shadow.radius), len(shadow.len), hash(shadow.hash),
+            textSize(shadow.textSize), typeface(shadow.typeface) {
+        text = new char[shadow.len];
+        memcpy(text, shadow.text, shadow.len);
+    }
+
+    ~ShadowText() {
+        delete[] text;
+    }
+
+    uint32_t radius;
+    uint32_t len;
+    uint32_t hash;
+    float textSize;
+    SkTypeface* typeface;
+    char *text;
+
+    bool operator<(const ShadowText& rhs) const {
+        if (hash < rhs.hash) return true;
+        else if (hash == rhs.hash) {
+            if (len < rhs.len) return true;
+            else if (len == rhs.len) {
+                if (radius < rhs.radius) return true;
+                else if (radius == rhs.radius) {
+                    if (textSize < rhs.textSize) return true;
+                    else if (textSize == rhs.textSize) {
+                        if (typeface < rhs.typeface) return true;
+                        else if (typeface == rhs.typeface) {
+                            return strncmp(text, rhs.text, len) < 0;
+                        }
+                    }
+                }
+            }
+        }
+        return false;
+    }
+}; // struct ShadowText
+
+/**
+ * Alpha texture used to represent a shadow.
+ */
+struct ShadowTexture: public Texture {
+    ShadowTexture(): Texture() {
+    }
+
+    float left;
+    float top;
+}; // struct ShadowTexture
+
+class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> {
+public:
+    TextDropShadowCache();
+    TextDropShadowCache(uint32_t maxByteSize);
+    ~TextDropShadowCache();
+
+    /**
+     * Used as a callback when an entry is removed from the cache.
+     * Do not invoke directly.
+     */
+    void operator()(ShadowText& text, ShadowTexture*& texture);
+
+    ShadowTexture* get(SkPaint* paint, const char* text, uint32_t len,
+            int numGlyphs, uint32_t radius);
+
+    /**
+     * Clears the cache. This causes all textures to be deleted.
+     */
+    void clear();
+
+    void setFontRenderer(FontRenderer& fontRenderer) {
+        mRenderer = &fontRenderer;
+    }
+
+    /**
+     * 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:
+    GenerationCache<ShadowText, ShadowTexture*> mCache;
+
+    uint32_t mSize;
+    uint32_t mMaxSize;
+    FontRenderer* mRenderer;
+}; // class TextDropShadowCache
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_TEXT_DROP_SHADOW_CACHE_H