[Nexus 5X Themes and Apps] bitdomo:
What is imgdata tool?

It is a tool to extract images like the bootlogo from the partition called imgdata. Then you can change these images with gimp or photshop then repack them into a new imgdata image and flash it to your device and see your new custom bootlogo or fastboot menu.

Instructions

Download imgdata tool from here or from the attachments.

Run start.bat script if you are a windows user or run start script if you are a linux or mac user.

Verify your phone's model by exactly typing NEXUS 5X.

Select option number 1 called Extract imgdata.

Drag and drop the imgdata.img file from stock folder to imgdata tool or type the path to imgdata.img.

The folder with the extracted images should pop-up. If it does not happen you will find the images in the images folder.

Edit the desired images.

Edit pos.txt:

Never change the entries line and never remove any line.

First column is the name of the image second column is the position of the image.

0x0 means the image will be shown on your screen in the top left corner.

If it is 0x1 the image move 1 pixel down.

If it is 1x0 the image will move 1 pixel right.

If it is 244x858 the image will move 244 pixels right and 858 pixels down.

You can check your changes in option number 2 called Preview from the main menu in the imgdata tool. It should open the image you selected or open the preview folder if you selected the option View all. If it does not happen then the preveiw images can be found in the folder called preveiws.

When you finished editing the images you can build a new imgdata from the images you edited by selecting option number 3 called Build imgdata from the main menu in the imgdata tool.

After the building finished you can flash the zip called flash-me.zip to flash the new imgdata to your phone or if you want you can flash it using imgdata tool.

Notes

Only 24 bit bmp files are acceptable.

You can find the custom imgdata image in the folder called custom after the building.

The maximum file size of the imgdata.img is 3145728 bytes (3 MiB). The tool will show you an error if that happens and it will ask you do you want to reduce the color depth of an image from 24 bit to 16 bit. If you still exceed the 3 MiB limit you can resize other images which are not important to you to a 1x1 pixel image.

If you want to use full screen images in the fastboot menu, then it will cover the system texts.

To revert the changes download stock.zip from the attachements and flash it.

If a new bootloader is released stop using the tool until I check whether the imgdata changed or not.

Working with bootloader version BHZ11b or older.

Changelog

1.0.0

Sources

https://github.com/bitdomo/imgdata/tree/bullhead

Technical details

Structure of imgdata

Partition header

Image headers

This pattern goes on, from DATA4 to DATA10.

Structure of the images

It consist of 4 bytes of chunks.

First byte: count number

Second byte: R value

Third byte: G value

Fourth byte: B value

Example:

05 00 00 00 02 FF FF FF

05: count number = 5

00 00 00: RGB value = black

02: count number = 2

FF FF FF: RGB value = white

So from the top left corner of your screen you would see 5 black pixels then 2 white pixels.

Thanks for [MENTION=2790198]gee one[/MENTION] for tesiting it on his Nexus 5X.