Class BitmapPool

valdi/src/java/com/snap/valdi/utils/BitmapPool.kt:20–215

* An object managing a pool of Bitmap objects. * It currently only temporarily holds onto the cached bitmaps, * releasing them after a short time has passed without any consumer * claiming them. */

 * claiming them.
 */
class BitmapPool(context: Context, val bitmapConfig: Bitmap.Config, val logger: Logger) {

    val maxWidth: Int
    val maxHeight: Int

    private val cachedBitmaps = mutableListOf<CachedBitmap>()
    private var cleanUpTimer: Timer? = null

    init {
        val windowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
        val displaySize = Point()
        windowManager.defaultDisplay.getRealSize(displaySize)
        maxWidth = displaySize.x
        maxHeight = displaySize.y
    }

    private class CachedBitmap(private val pool: BitmapPool, private var bitmap: Bitmap?): BitmapHandler {

        private val retainCount = AtomicInteger(1)

        var expirationTime = 0L

        private var isDirty = true

        val isUnused: Boolean
            get() = retainCount.get() == 0

        override fun getBitmap(): Bitmap {
            return bitmap!!
        }

        fun prepareForReuse() {
            synchronized(this) {
                if (!isDirty) {
                    return
                }

                isDirty = false
                bitmap?.eraseColor(Color.TRANSPARENT)
            }
        }

        fun markDirty() {
            synchronized(this) {
                isDirty = true
            }
        }

        fun destroy() {
            synchronized(this) {
                bitmap?.recycle()
                bitmap = null
            }
        }

        override fun retain() {
            retainCount.incrementAndGet()
        }