Android frame buffer分析的相关内容

Android帧缓冲区（Frame Buffer）硬件抽象层（HAL）模块Gralloc的实现原理分析（4）

成员变量fd指向一个文件描述符，这个文件描述符要么指向帧缓冲区设备，要么指向一块匿名共享内存，取决于它的宿主结构体private_handle_t描述的一个图形缓冲区是在帧缓冲区分配的，还是在内存中分配的。 ...

Android帧缓冲区（Frame Buffer）硬件抽象层（HAL）模块Gralloc的实现原理分析（6）

函数fb_device_open在打开fb设备的过程中，会调用另外一个函数mapFrameBuffer来获得系统帧缓冲区的信息，并且将这些信息保存在参数module所描述的一个private_module_t结构体的各个成员变量中。有了系统帧缓冲区的...

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Android帧缓冲区（Frame Buffer）硬件抽象层（HAL）模块Gralloc的实现原理分析（9）

5. 图形缓冲区的释放过程前面提到，用户空间的应用程序用到的图形缓冲区是由Gralloc模块中的函数gralloc_free来释放的，这个函数实现在文件hardware/libha...

Android系统Surface机制的SurfaceFlinger服务对帧缓冲区（Frame Buffer）的管理分析

在前文中，我们分析了SurfaceFlinger服务的启动过程。SurfaceFlinger服务在启动的过程中，会对系统的硬件帧缓冲区进行初始化。由于系统的硬件帧缓冲区一般只有一个，并且不是谁都可以随便访问的，因此，它就需要由一个服务来统一管理。在Android系统中，这个服务便是SurfaceFl...

Android帧缓冲区（Frame Buffer）硬件抽象层（HAL）模块Gralloc的实现原理分析（1）

前面在介绍Android系统的开机画面时提到，Android设备的显示屏被抽象为一个帧缓冲区，而Android系统中的SurfaceFlinger服务就是通过向这个帧缓冲区写入内容来绘制应用程序的用户界面的。Android系统在硬件抽象层中提供了一个Gralloc模块，封装了对帧缓冲区的...

Android帧缓冲区（Frame Buffer）硬件抽象层（HAL）模块Gralloc的实现原理分析（5）

3. fb设备的打开过程在Gralloc模块中，fb设备的ID值定义为GRALLOC_HARDWARE_FB0。GRALLOC_HARDWARE_FB0是一个宏，定义在文件hardware/libhardwa...

Android帧缓冲区（Frame Buffer）硬件抽象层（HAL）模块Gralloc的实现原理分析（7）

显示屏的刷新频率与显示屏的扫描时序相关。显示屏的扫描时序可以参考Linux内核源代码目录下的Documentation/fb/framebuffer.txt文件。我们结合图2来简单说明上述代码是如何计算显示屏的刷新频率的。图 2 显示屏扫描时序示意图 &nbs...

Android帧缓冲区（Frame Buffer）硬件抽象层（HAL）模块Gralloc的实现原理分析（10）

7. 图形缓冲区的注销过程图形缓冲区使用完成之后，就需要从当前进程中注销。前面提到，注销图形缓冲区是由Gralloc模块中的函数gralloc_unregister_buffer来实现的，这...

Android帧缓冲区（Frame Buffer）硬件抽象层（HAL）模块Gralloc的实现原理分析（2）

函数load也是实现在文件hardware/libhardware/hardware.c文件中，如下所示： static int load(const char *id, &...

Android帧缓冲区（Frame Buffer）硬件抽象层（HAL）模块Gralloc的实现原理分析（3）

结构体gralloc_module_t定义在文件hardware/libhardware/include/hardware/gralloc.h中，它主要是定义了四个用来操作图形缓冲区的成员函数，如下所示： typedef struct gralloc_m...

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