提取MIUI fastboot界面图片

概述

在酷安看到一张表情包，素材是MIUI fastboot界面图片，但是不够清晰，于是考虑自己提取。

原理

splash.img (or splash.bin or logo.img or logo.bin) is the raw file in which the boot logo (splash screen - the picture displayed when the device is booted) is stored.
It is stored under the partition: splash or logo in many Snapdragon devices (might vary for devices)

MTK

导出logo分区

1	dd if=/dev/block/bootdevice/by-name/logo of=/sdcard/logo.bin

提取图片

使用LogoBuilder提取。

高通

导出splash分区

1	dd if=/dev/block/bootdevice/by-name/splash of=/sdcard/splash.img

提取图片

使用binwalk分析splash.img （建议使用Linux操作）

1	binwalk -e splash.img

结果类似于：

DECIMAL       HEXADECIMAL     DESCRIPTION
--------------------------------------------------------------------------------
16384         0x4000          PC bitmap, Windows 3.x format,, 1080 x 1920 x 24
6237238       0x5F2C36        PC bitmap, Windows 3.x format,, 1080 x 1920 x 24
12458092      0xBE186C        PC bitmap, Windows 3.x format,, 1080 x 1920 x 24
18678946      0x11D04A2       PC bitmap, Windows 3.x format,, 1080 x 1920 x 24

然后使用dd命令或十六进制编辑器，提取BMP图片即可。

结果

2040x1080：

1920x1080：

参考

[GUIDE] How to Change Boot Logo (Splash Screen) for Snapdragon Devices (splash.img)
Changing boot logo (logo.bin) program