389 lines
11 KiB
Kotlin
389 lines
11 KiB
Kotlin
package jp.juggler.apng
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import android.graphics.Bitmap
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import android.graphics.Canvas
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import android.graphics.Paint
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import android.graphics.PorterDuff
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import android.graphics.PorterDuffXfermode
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import android.graphics.Rect
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import android.util.Log
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import java.io.InputStream
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import java.util.ArrayList
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class ApngFrames private constructor(
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private val pixelSizeMax : Int = 0,
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private val debug:Boolean =false
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) : ApngDecoderCallback {
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companion object {
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private const val TAG = "ApngFrames"
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// ループしない画像の場合は3秒でまたループさせる
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private const val DELAY_AFTER_END = 3000L
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// アニメーションフレームの描画に使う
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private val sSrcModePaint : Paint by lazy {
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val paint = Paint()
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paint.xfermode = PorterDuffXfermode(PorterDuff.Mode.SRC)
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paint.isFilterBitmap = true
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paint
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}
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private fun createBlankBitmap(w : Int, h : Int) : Bitmap {
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return Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888)
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}
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// WARNING: ownership of "src" will be moved or recycled.
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private fun scaleBitmap(src : Bitmap?, size_max : Int) : Bitmap? {
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if(src == null) return null
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val wSrc = src.width
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val hSrc = src.height
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if(size_max <= 0 || wSrc <= size_max && hSrc <= size_max) return src
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val wDst : Int
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val hDst : Int
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if(wSrc >= hSrc) {
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wDst = size_max
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hDst = Math.max(
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1,
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(size_max.toFloat() * hSrc.toFloat() / wSrc.toFloat() + 0.5f).toInt()
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)
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} else {
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hDst = size_max
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wDst = Math.max(
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1,
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(size_max.toFloat() * wSrc.toFloat() / hSrc.toFloat() + 0.5f).toInt()
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)
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}
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Log.v(TAG,"scaleBitmap: $wSrc,$hSrc => $wDst,$hDst")
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val b2 = createBlankBitmap(wDst, hDst)
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val canvas = Canvas(b2)
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val rectSrc = Rect(0, 0, wSrc, hSrc)
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val rectDst = Rect(0, 0, wDst, hDst)
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canvas.drawBitmap(src, rectSrc, rectDst,
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sSrcModePaint
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)
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src.recycle()
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return b2
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}
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private fun toBitmap(src : ApngBitmap) : Bitmap {
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return Bitmap.createBitmap(
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src.colors, // int[] 配列
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0, // offset
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src.width, //stride
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src.width, // width
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src.height, //height
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Bitmap.Config.ARGB_8888
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)
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}
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private fun toBitmap(src : ApngBitmap, size_max : Int) : Bitmap? {
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return scaleBitmap(
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toBitmap(
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src
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), size_max
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)
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}
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@Suppress("unused")
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fun parseApng(inStream : InputStream, pixelSizeMax : Int,debug:Boolean=false) : ApngFrames {
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val result = ApngFrames(pixelSizeMax,debug)
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try {
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ApngDecoder.parseStream(inStream, result)
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result.onParseComplete()
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return if( result.defaultImage != null || result.frames?.isNotEmpty() == true ){
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result
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}else{
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throw RuntimeException("APNG has no image")
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}
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} catch(ex : Throwable) {
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result.dispose()
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throw ex
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}
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}
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}
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private var header : ApngImageHeader? = null
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private var animationControl : ApngAnimationControl? = null
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val width : Int
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get() = Math.min( pixelSizeMax, header?.width ?: 1)
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val height : Int
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get() = Math.min( pixelSizeMax, header?.height ?: 1)
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@Suppress("MemberVisibilityCanBePrivate")
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val numFrames : Int
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get() = animationControl?.numFrames ?: 1
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@Suppress("unused")
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val hasMultipleFrame : Boolean
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get() = numFrames > 1
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private var timeTotal = 0L
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private lateinit var canvas : Canvas
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private var canvasBitmap : Bitmap? = null
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// 再生速度の調整
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private var durationScale = 1f
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// APNGじゃなかった場合に使われる
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private var defaultImage : Bitmap? = null
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private class Frame(
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internal val bitmap : Bitmap,
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internal val time_start : Long,
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internal val time_width : Long
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)
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private var frames : ArrayList<Frame>? = null
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@Suppress("unused")
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constructor(bitmap : Bitmap) : this() {
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this.defaultImage = bitmap
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}
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private fun onParseComplete() {
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canvasBitmap?.recycle()
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canvasBitmap = null
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val frames = this.frames
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if( frames != null ){
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if( frames.size > 1){
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defaultImage?.recycle()
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defaultImage = null
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}else if( frames.size == 1){
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defaultImage?.recycle()
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defaultImage = frames.first().bitmap
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frames.clear()
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}
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}
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}
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fun dispose() {
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defaultImage?.recycle()
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canvasBitmap?.recycle()
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val frames = this.frames
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if(frames != null) {
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for(f in frames) {
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f.bitmap.recycle()
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}
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}
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}
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class FindFrameResult {
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var bitmap : Bitmap? = null // may null
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var delay : Long = 0 // 再描画が必要ない場合は Long.MAX_VALUE
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}
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// シーク位置に応じたコマ画像と次のコマまでの残り時間をresultに格納する
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@Suppress("unused")
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fun findFrame(result : FindFrameResult, t : Long) {
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if(defaultImage != null) {
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result.bitmap = defaultImage
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result.delay = Long.MAX_VALUE
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return
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}
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val animationControl = this.animationControl
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val frames = this.frames
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if(animationControl == null || frames == null) {
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// この場合は既に mBitmapNonAnimation が用意されてるはずだ
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result.bitmap = null
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result.delay = Long.MAX_VALUE
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return
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}
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val frameCount = frames.size
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val isFinite = ! animationControl.isPlayIndefinitely
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val repeatSequenceCount = if(isFinite) animationControl.numPlays else 1
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val endWait = if(isFinite) DELAY_AFTER_END else 0L
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val timeTotalLoop = Math.max(1,timeTotal * repeatSequenceCount + endWait)
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val tf = (if(0.5f + t < 0f) 0f else t / durationScale).toLong()
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// 全体の繰り返し時刻で余りを計算
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val tl = tf % timeTotalLoop
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if(tl >= timeTotalLoop - endWait) {
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// 終端で待機状態
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result.bitmap = frames[frameCount - 1].bitmap
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result.delay = (0.5f + (timeTotalLoop - tl) * durationScale).toLong()
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return
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}
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// １ループの繰り返し時刻で余りを計算
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val tt = tl % timeTotal
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// フレームリストを時刻で二分探索
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var s = 0
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var e = frameCount
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while(e - s > 1) {
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val mid = s + e shr 1
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val frame = frames[mid]
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// log.d("s=%d,m=%d,e=%d tt=%d,fs=%s,fe=%d",s,mid,e,tt,frame.time_start,frame.time_start+frame.time_width );
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if(tt < frame.time_start) {
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e = mid
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} else if(tt >= frame.time_start + frame.time_width) {
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s = mid + 1
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} else {
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s = mid
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break
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}
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}
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s = if(s < 0) 0 else if(s >= frameCount - 1) frameCount - 1 else s
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val frame = frames[s]
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val delay = frame.time_start + frame.time_width - tt
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result.bitmap = frames[s].bitmap
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result.delay = (0.5f + durationScale * Math.max(0f, delay.toFloat())).toLong()
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// log.d("findFrame tf=%d,tl=%d/%d,tt=%d/%d,s=%d,w=%d,delay=%d",tf,tl,loop_total,tt,timeTotal,s,frame.time_width,result.delay);
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}
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/////////////////////////////////////////////////////
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// implements ApngDecoderCallback
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override fun onApngWarning(message : String) {
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Log.w(TAG, message)
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}
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override fun onApngDebug(message : String) {
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Log.d(TAG, message)
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}
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override fun canApngDebug():Boolean = debug
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override fun onHeader(apng : Apng, header : ApngImageHeader) {
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this.header = header
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}
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override fun onAnimationInfo(
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apng : Apng,
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header: ApngImageHeader,
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animationControl : ApngAnimationControl
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) {
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this.animationControl = animationControl
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val canvasBitmap =
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createBlankBitmap(header.width, header.height)
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this.canvasBitmap = canvasBitmap
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this.canvas = Canvas(canvasBitmap)
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this.frames = ArrayList(animationControl.numFrames)
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}
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override fun onDefaultImage(apng : Apng, bitmap : ApngBitmap) {
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defaultImage?.recycle()
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defaultImage = toBitmap(bitmap, pixelSizeMax)
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}
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override fun onAnimationFrame(
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apng : Apng,
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frameControl : ApngFrameControl,
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bitmap : ApngBitmap
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) {
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val frames = this.frames ?: return
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val canvasBitmap = this.canvasBitmap ?: return
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// APNGのフレーム画像をAndroidの形式に変換する。この段階ではリサイズしない
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val bitmapNative = toBitmap(bitmap)
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val previous : Bitmap? = if(frameControl.disposeOp == DisposeOp.Previous) {
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// Capture the current bitmap region IF it needs to be reverted after rendering
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Bitmap.createBitmap(
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canvasBitmap,
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frameControl.xOffset,
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frameControl.yOffset,
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frameControl.width,
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frameControl.height
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)
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} else {
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null
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}
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val paint = if(frameControl.blendOp == BlendOp.Source) {
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sSrcModePaint // SRC_OVER, not blend
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} else {
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null // (for blend, leave paint null)
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}
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// Draw the new frame into place
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canvas.drawBitmap(
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bitmapNative,
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frameControl.xOffset.toFloat(),
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frameControl.yOffset.toFloat(),
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paint
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)
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// Extract a drawable from the canvas. Have to copy the current bitmap.
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// Store the drawable in the sequence of frames
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val timeStart = timeTotal
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val timeWidth = Math.max(1L, frameControl.delayMilliseconds)
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timeTotal += timeWidth
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val scaledBitmap =
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scaleBitmap(
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canvasBitmap.copy(
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Bitmap.Config.ARGB_8888,
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false
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), pixelSizeMax
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)
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if(scaledBitmap != null) {
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frames.add(Frame(scaledBitmap, timeStart, timeWidth))
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}
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// Now "dispose" of the frame in preparation for the next.
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// https://wiki.mozilla.org/APNG_Specification#.60fcTL.60:_The_Frame_Control_Chunk
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when(frameControl.disposeOp) {
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DisposeOp.None -> {
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}
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DisposeOp.Background ->
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// APNG_DISPOSE_OP_BACKGROUND: the frame's region of the output buffer is to be cleared to fully transparent black before rendering the next frame.
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//System.out.println(String.format("Frame %d clear background (full=%s, x=%d y=%d w=%d h=%d) previous=%s", currentFrame.sequenceNumber,
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// isFull, currentFrame.xOffset, currentFrame.yOffset, currentFrame.width, currentFrame.height, previous));
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//if (true || isFull) {
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canvas.drawColor(0, PorterDuff.Mode.CLEAR) // Clear to fully transparent black
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DisposeOp.Previous ->
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// APNG_DISPOSE_OP_PREVIOUS: the frame's region of the output buffer is to be reverted to the previous contents before rendering the next frame.
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//System.out.println(String.format("Frame %d restore previous (full=%s, x=%d y=%d w=%d h=%d) previous=%s", currentFrame.sequenceNumber,
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// isFull, currentFrame.xOffset, currentFrame.yOffset, currentFrame.width, currentFrame.height, previous));
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// Put the original section back
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if(previous != null) {
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canvas.drawBitmap(
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previous, frameControl.xOffset.toFloat(), frameControl.yOffset.toFloat(),
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sSrcModePaint
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)
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previous.recycle()
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}
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else -> {
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// 0: Default should never happen
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// APNG_DISPOSE_OP_NONE: no disposal is done on this frame before rendering the next; the contents of the output buffer are left as is.
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//System.out.println("Frame "+currentFrame.sequenceNumber+" do nothing dispose");
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// do nothing
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// } else {
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// Rect rt = new Rect(currentFrame.xOffset, currentFrame.yOffset, currentFrame.width+currentFrame.xOffset, currentFrame.height+currentFrame.yOffset);
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// paint = new Paint();
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// paint.setColor(0);
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// paint.setStyle(Paint.Style.FILL);
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// canvas.drawRect(rt, paint);
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// }
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}
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}
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}
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}
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