libs/hwui/PatchCache.h

/*
 * 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_HWUI_PATCH_CACHE_H
#define ANDROID_HWUI_PATCH_CACHE_H

#include <utils/KeyedVector.h>

#include "Debug.h"
#include "Patch.h"

namespace android {
namespace uirenderer {

///////////////////////////////////////////////////////////////////////////////
// Defines
///////////////////////////////////////////////////////////////////////////////

// Debug
#if DEBUG_PATCHES
    #define PATCH_LOGD(...) ALOGD(__VA_ARGS__)
#else
    #define PATCH_LOGD(...)
#endif

///////////////////////////////////////////////////////////////////////////////
// Cache
///////////////////////////////////////////////////////////////////////////////

class PatchCache {
public:
    PatchCache();
    PatchCache(uint32_t maxCapacity);
    ~PatchCache();

    Patch* get(const uint32_t bitmapWidth, const uint32_t bitmapHeight,
            const float pixelWidth, const float pixelHeight,
            const int32_t* xDivs, const int32_t* yDivs, const uint32_t* colors,
            const uint32_t width, const uint32_t height, const int8_t numColors);
    void clear();

    uint32_t getSize() const {
        return mCache.size();
    }

    uint32_t getMaxSize() const {
        return mMaxEntries;
    }

private:
    /**
     * Description of a patch.
     */
    struct PatchDescription {
        PatchDescription(): bitmapWidth(0), bitmapHeight(0), pixelWidth(0), pixelHeight(0),
                xCount(0), yCount(0), emptyCount(0), colorKey(0) {
        }

        PatchDescription(const uint32_t bitmapWidth, const uint32_t bitmapHeight,
                const float pixelWidth, const float pixelHeight,
                const uint32_t xCount, const uint32_t yCount,
                const int8_t emptyCount, const uint32_t colorKey):
                bitmapWidth(bitmapWidth), bitmapHeight(bitmapHeight),
                pixelWidth(pixelWidth), pixelHeight(pixelHeight),
                xCount(xCount), yCount(yCount),
                emptyCount(emptyCount), colorKey(colorKey) {
        }

        static int compare(const PatchDescription& lhs, const PatchDescription& rhs);

        bool operator==(const PatchDescription& other) const {
            return compare(*this, other) == 0;
        }

        bool operator!=(const PatchDescription& other) const {
            return compare(*this, other) != 0;
        }

        friend inline int strictly_order_type(const PatchDescription& lhs,
                const PatchDescription& rhs) {
            return PatchDescription::compare(lhs, rhs) < 0;
        }

        friend inline int compare_type(const PatchDescription& lhs,
                const PatchDescription& rhs) {
            return PatchDescription::compare(lhs, rhs);
        }

    private:
        uint32_t bitmapWidth;
        uint32_t bitmapHeight;
        float pixelWidth;
        float pixelHeight;
        uint32_t xCount;
        uint32_t yCount;
        int8_t emptyCount;
        uint32_t colorKey;

    }; // struct PatchDescription

    uint32_t mMaxEntries;
    KeyedVector<PatchDescription, Patch*> mCache;

}; // class PatchCache

}; // namespace uirenderer
}; // namespace android

#endif // ANDROID_HWUI_PATCH_CACHE_H