SurfaceView画布在4K Android TV上以1080p渲染

问题描述 投票：0回答：1

我正在尝试使用SurfaceView以原始分辨率在4K Android TV设备（运行Android 9的Nvidia Shield TV）上渲染3840x2160位图。

根据Android 6 release notes，我应该能够将preferredDisplayModeId设置为支持4K分辨率的Display.Mode，以便使我的SurfaceView以4K渲染。但是，看来即使设置了preferredDisplayModeId，我视图中提供给Canvas方法的onDraw也仅为1920x1080。尝试在其上绘制3840x2160位图会导致图像缩小到1080p，然后再放大回到2160p，在此过程中丢失信息。

这是我的Activity中的相关代码：

windowManager.defaultDisplay.supportedModes.forEach {
    if (it.physicalHeight == 2160 && it.refreshRate > 60) {
        val params = window.attributes
        params.preferredDisplayModeId = it.modeId
        window.attributes = params
    }
}

setContentView(R.layout.main)

我的布局包含扩展了SurfaceView的自定义视图。自定义视图具有onDraw方法，如下所示：

override fun onDraw(canvas: Canvas) {
    canvas.drawBitmap(
        currentImage,
        Rect(0, 0, currentImage!!.width, currentImage!!.height),
        canvas.clipBounds,
        null
    )
}

[canvas.clipBounds是Rect(0, 0 - 1920, 1080)，因此当它尝试呈现完整的位图时，必须将其缩小以适合。

[渲染我的adb shell dumpsys SurfaceFlinger时，这是SurfaceView的一些输出：

Display 0 HWC layers:
-------------------------------------------------------------------------------
 Layer name
           Z |  Comp Type |   Disp Frame (LTRB) |          Source Crop (LTRB)
-------------------------------------------------------------------------------
 com.google.android.tvlauncher/com.google.android.tvlauncher.MainActivity#0
  rel      0 |     Device |    0    0 3840 2160 |    0.0    0.0 1920.0 1080.0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Dim Layer for - Task=580#0
  rel     -1 |     Client |    0    0 3840 2160 |    0.0    0.0   -1.0   -1.0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 com.android.tv.settings/com.android.tv.settings.MainSettings#0
  rel      0 |     Client |    0    0 3840 2160 |    0.0    0.0 1920.0 1080.0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Background for -SurfaceView - Sys2023:dream#0
  rel     -3 |     Client |    0    0 3840 2160 |    0.0    0.0   -1.0   -1.0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Sys2023:dream#0
  rel      0 |     Client |    0    0 3840 2160 |    0.0    0.0 1920.0 1080.0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Allocated buffers:
0x513aff00: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | Sys2023:dream#0
0x5333f300:    4.00 KiB |   16 (  64) x   16 |    1 |        1 | 0x1a00 | FakeFramebuffer
0x53340f80: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.android.tv.settings/com.android.tv.settings.MainSettings#0
0x53341280: 32400.00 KiB | 3840 (3840) x 2160 |    1 |        1 | 0x1b00 | FramebufferSurface
0x53341700: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.google.android.tvlauncher/com.google.android.tvlauncher.MainActivity#0
0x53341880: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.google.android.tvlauncher/com.google.android.tvlauncher.MainActivity#0
0x53341d00: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.android.tv.settings/com.android.tv.settings.MainSettings#0
0x53341e80: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.google.android.tvlauncher/com.google.android.tvlauncher.MainActivity#0
0x55d35480: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.android.systemui.ImageWallpaper#0
0x55d35900: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.android.tv.settings/com.android.tv.settings.MainSettings#0
0x55d35d80: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | Sys2023:dream#0
0x55d37580: 32400.00 KiB | 3840 (3840) x 2160 |    1 |        1 | 0x1b00 | FramebufferSurface
Total allocated (estimate): 137704.00 KB

为了进行比较，当我的应用程序渲染ExoPlayer视图时，这是相同的输出，它正确地渲染了4K SurfaceView：

Display 0 HWC layers:
-------------------------------------------------------------------------------
 Layer name
           Z |  Comp Type |   Disp Frame (LTRB) |          Source Crop (LTRB)
-------------------------------------------------------------------------------
 SurfaceView - Sys2023:dream#0
  rel     -2 |     Device |    0    0 3840 2160 |    0.0    0.0 3840.0 2160.0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Sys2023:dream#0
  rel      0 |     Device |    0    0 3840 2160 |    0.0    0.0 1920.0 1080.0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Allocated buffers:
0x513af180: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x513af300: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x513afc00: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x513afd80: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | Sys2023:dream#0
0x5333f300:    4.00 KiB |   16 (  64) x   16 |    1 |        1 | 0x1a00 | FakeFramebuffer
0x53340f80: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.android.tv.settings/com.android.tv.settings.MainSettings#0
0x53341280: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x53341400: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x53341700: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.google.android.tvlauncher/com.google.android.tvlauncher.MainActivity#0
0x53341880: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.google.android.tvlauncher/com.google.android.tvlauncher.MainActivity#0
0x53341a00: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | Sys2023:dream#0
0x53341d00: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.android.tv.settings/com.android.tv.settings.MainSettings#0
0x53341e80: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.google.android.tvlauncher/com.google.android.tvlauncher.MainActivity#0
0x55d35480: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.android.systemui.ImageWallpaper#0
0x55d35900: 8100.00 KiB | 1920 (1920) x 1080 |    1 |        1 | 0xb00 | com.android.tv.settings/com.android.tv.settings.MainSettings#0
0x55d35f00: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x55d36080: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x55d36200: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x55d36380: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x55d36500: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x55d36680: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x55d36800: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x55d36f80: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x55d37100: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
0x55d37280: unknown     | 3840 (3840) x 2160 |    1 |      12B | 0x900 | SurfaceView - Sys2023:dream#0
Total allocated (estimate): 72904.00 KB

[您可以看到显示SurfaceView时的ExoPlayer缓冲区正确为3840x2160，但是使用我的自定义视图时，似乎没有分配任何SurfaceView缓冲区。

android android-canvas android-tv
1个回答
0
投票

好吧，我将开始使用ExoPlayer展示您需要的东西。应该有可能。

但是，我认为您没有正确分配画布，我想您是否正在使用包含4k的rect（args）？看来您创建的画布错误，或者是因为如果您在nvidia盾上运行并且afaik我的护盾在1080p上运行android的功能，并且如果getter请求仍然很旧，则画布将获得该大小。

在我看来，最简单的解决方案是使用ExoPlayer。

最新问题
© www.soinside.com 2019 - 2024. All rights reserved.