display学习笔记
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2024-05-17
15:15:46
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目录
一、显示框架介绍.....................................................................................................................................................................6
1.1 显示屏..........................................................................................................................................................................8
1.2 SurfaceFlinger-图形合成者........................................................................................................................................12
1.3 上层绘图....................................................................................................................................................................15
二、 显示系统重点模块流程.................................................................................................................................................15
2.1 Vsync...........................................................................................................................................................................15
2.1.1 Vsync 功能.......................................................................................................................................................16
2.1.2 VSync 代码流程..............................................................................................................................................20
2.1.3 使用 systrace 查看 VSync ...............................................................................................................................23
2.1.4 Vsync Offset.....................................................................................................................................................26
Offset 为 0.......................................................................................................................................................27
Offset 不为 0...................................................................................................................................................28
Offset 的优缺点...............................................................................................................................................29
2.1.5 Android 图形数据流向...................................................................................................................................30
2.2 BufferQueue ................................................................................................................................................................31
2.2.1 Android S 之前框架 ........................................................................................................................................34
2.2.2 Android S 框架 ................................................................................................................................................34
2.3 Fence ...........................................................................................................................................................................42
2.4 HWUI ..........................................................................................................................................................................44
2.4.1 类关系图..........................................................................................................................................................44
2.4.2 RenderThread 等重要对象创建流程..............................................................................................................47
2.4.3 接收 VSync 绘制流程.....................................................................................................................................48
2.4.4 GPU 呈现模式的数据计算和绘制流程.........................................................................................................50
2.4.4.1 数据计算流程......................................................................................................................................50
2.4.4.2 在屏幕上显示条形图代码逻辑..........................................................................................................52
2.4.4.3 在 dumpsys gfxinfo 打印代码逻辑.....................................................................................................55
2.4.5 HWUI 绘制流程在 systrace 中对应的具体时间 ...........................................................................................65
2.5 GPU 合成之 RenderEngineType................................................................................................................................69
2.6 屏幕刷新率.................................................................................................................................................................71
2.6.1 流畅画面功能.................................................................................................................................................77
2.7 ro.surface_flinger.enable_frame_rate_override 属性 .................................................................................................80
2.7.1 SurfaceFlinger 中的系统属性 ........................................................................................................................80
2.7.2 Java 层使用......................................................................................................................................................81
2.7.3 C++层使用.......................................................................................................................................................83
2.8 应用建立和 SurfaceFlinger 的沟通桥梁................................................................................................................84
三、显示上层问题分析方法和工具介绍...............................................................................................................................90
3.1 Android 通用...............................................................................................................................................................90
3.1.1 截屏和录屏.....................................................................................................................................................90
3.1.2 停用 HW 叠加层 ............................................................................................................................................90
3.1.3 使用命令输入滑动事件.................................................................................................................................95
3.1.4 停用应用.........................................................................................................................................................96
3.1.5 显示过度绘制区域..........................................................................................................................................96
3.1.6 GPU 渲染模式分析.........................................................................................................................................97
3.1.6.1 在屏幕上显示为条形图.......................................................................................................................97
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