Fix #963 PC 暂停时按键盘调进度不会渲染视频帧

app/shared/video-player/src/desktopMain/kotlin/ui/SkiaBitmapVideoSurface.kt

@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2024 OpenAni and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license, which can be found at the following link.
+ *
+ * https://github.com/open-ani/ani/blob/main/LICENSE
+ */
+
 package me.him188.ani.app.videoplayer.ui
 
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.graphics.asComposeImageBitmap
+import kotlinx.atomicfu.atomic
 import kotlinx.coroutines.flow.MutableStateFlow
 import org.jetbrains.skia.Bitmap
 import org.jetbrains.skia.ColorAlphaType
@@ -29,6 +39,11 @@ class SkiaBitmapVideoSurface : VideoSurface(VideoSurfaceAdapters.getVideoSurface
     private val composeBitmap = mutableStateOf<ImageBitmap?>(null)
 
     val enableRendering = MutableStateFlow(false)
+
+    /**
+     * 即使 [enableRendering]
+     */
+    val allowedDrawFrames = atomic(0)
     val bitmap by composeBitmap
 
     fun clearBitmap() {
@@ -66,7 +81,9 @@ class SkiaBitmapVideoSurface : VideoSurface(VideoSurfaceAdapters.getVideoSurface
             nativeBuffers: Array<ByteBuffer>,
             bufferFormat: BufferFormat,
         ) {
-            if (!enableRendering.value) return
+            val allowedDrawFramesValue = allowedDrawFrames.value
+            if (!enableRendering.value && allowedDrawFramesValue <= 0) return
+            if (allowedDrawFrames.decrementAndGet() < 0) return
             SwingUtilities.invokeLater {
                 nativeBuffers[0].rewind()
                 nativeBuffers[0].get(frameBytes)

app/shared/video-player/src/desktopMain/kotlin/ui/VideoPlayer.desktop.kt

@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2024 OpenAni and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license, which can be found at the following link.
+ *
+ * https://github.com/open-ani/ani/blob/main/LICENSE
+ */
+
 package me.him188.ani.app.videoplayer.ui
 
 import androidx.compose.foundation.Canvas
@@ -478,6 +487,7 @@ class VlcjVideoPlayerState(parentCoroutineContext: CoroutineContext) : PlayerSta
     override fun seekTo(positionMillis: Long) {
         currentPositionMillis.value = positionMillis
         player.controls().setTime(positionMillis)
+        surface.allowedDrawFrames.value = 2 // 多渲染一帧, 防止 race 问题π
     }
 
 }