Home Menu/Themes

This page describes the formats/structure of the data stored in RomFS for Home Menu DLC, for themes.

Control Content

The control content has content-index 0. It's unknown what if any of this is Home Menu specific.

RomFS structure:

• "MetaDataContentHeader.bin": Unknown, size is 0x44-bytes.
• "ContentInfoArchive_<region>_<lang>.bin" Contains the list of all DLC content available under this DLC title(which can include DLC that's not yet accessible via the shop). <region> can be "USA", etc. <lang>, for the US title: "en", "es", "fr", and "pt".
• "icons/<decimal_id>.icn" Contains the raw DLC icon image data, without any header. 48x48 tiled RGB565.

ContentInfoArchive entry format, size 0xC8(this file contains the following entry for each of the DLC content):

Relative offset	Size	Description
0x0	0x4	Content index - 1
0x4	0x4	0x0 = disabled, 0x1 = enabled.
0x8	0x40	char string for the title text.
0x48	0x88	char string for the description text.

The first entry is a "header": contentindex val=1, second word = <total DLC content excluding DLC control content>. The two strings are set to dummy text.

Theme Content

RomFS structure:

• "bgm.bcstm": Background music, see here.
• "body_LZ.bin": LZ11 compressed blob containing the rest of the theme data(graphics + optional CWAVs).

Decompressed body_LZ.bin structure

Offset	Size	Description
0x0	0x4	Version (Must be 1)
0x4	0x1	Unknown
0x5	0x1	0 = disable usage of bgm.bcstm, non-zero = enable usage of bgm.bcstm.
0x8	0x4	Normally zero(not used?).
0xC	0x4	Must be <4. Top screen draw type: 0 = none, 1 = solid color(see below), 2 = extension of val1(see below), 3 = texture.
0x10	0x4	Top screen frame type, when draw-type is 3: 0 = texture1, 1 = texture0, 3 = texture1.
0x14	0x4	Offset for the top screen solid color data.
0x18	0x4	Top screen texture offset, see below.
0x1C	0x4	Additional top-screen texture offset, used with draw-type val2. This is optional when using draw-type val2.
0x20	0x4	Must be <4. Bottom screen draw type: 0 = none, 1 = solid color(see below), 2 = invalid, 3 = texture.
0x24	0x4	Bottom screen frame type, when draw-type is 3: 0 = texture4, 1 = texture2, 2 = texture3, 3 = texture4, 4 = texture3.
0x28	0x4	Bottom Screen Solid Color/Texture offset, see below.
0x2C	0x4	Must be <2. 1 = enables usage of the following field.
0x30	0x4	Offset to a 0xC-byte block.
0x34	0x4	Must be <2. 1 = enables usage of the following field.
0x38	0x4	Offset to a 0xC-byte block.
0x3C	0x4	Must be <2. 1 = enables usage of the following two fields.
0x40	0x4	Offset to the data for texture6.
0x44	0x4	Offset to the data for texture7.
0x48	0x4	Must be <2. 1 = enables usage of the following field.
0x4C	0x4	Offset to a 0xD-byte block.
0x50	0x4	Must be <2. 1 = enables usage of the following two fields.
0x54	0x4	Offset to the data for texture8.
0x58	0x4	Offset to the data for texture9.
0x5C	0x4	Must be <2. 1 = enables usage of the following field.
0x60	0x4	Offset to a 0xD-byte block.
0x64	0x4	Must be <2. 1 = enables usage of the following field.
0x68	0x4	Offset to a 0x9-byte block. (RGB colors for bottom screen arrows)
0x6C	0x4	Must be <2. 1 = enables usage of the following two fields.
0x70	0x4	Offset to a 0x20-byte block.
0x74	0x4	Offset to a 0x20-byte block.
0x78	0x4	Must be <3. 1 = enables usage of the following field.
0x7C	0x4	Offset to a 0xD-byte block.
0x80	0x4	Must be <2. 1 = enables usage of the following field.
0x84	0x4	Offset to a 0xD-byte block.
0x88	0x4	Must be <2. 1 = enables usage of the following field.
0x8C	0x4	Offset to a 0x9-byte block.
0x90	0x4	Must be <2. 1 = enables usage of the following field.
0x94	0x4	Offset to a 0xD-byte block.
0x98	0x4	Must be <2. 1 = enables usage of the following field.
0x9C	0x4	Offset to a 0x20-byte block.
0xA0	0x4	Must be <2. 1 = enables usage of the following field.
0xA4	0x4	Offset to a 0x15-byte block.
0xA8	0x4	Must be <2. 1 = enables usage of the following field.
0xAC	0x4	Offset to a 0xC-byte block. The block contains four RGB888 values, of which the first is the background colour for the "press to activate camera" overlay, and the fourth is the text colour of the same overlay.
0xB0	0x4	Must be <2. 1 = enables usage of the following field.
0xB4	0x4	Offset to a 0x6-byte block.
0xB8	0x4	Must be <2. 1 = below audio data section is used, otherwise it's not used.
0xBC	0x4	Audio data section size, this must be <=0x2DC00.
0xC0	0x4	Offset for the audio data section.

The filesize is aligned to 0x10-bytes. The filesize must be at least 0xC4-bytes, due to padding/alignment the first block of data after the header is normally located at 0xD0.

With the solid-color data, there's 5-bytes located at the solid-color data offset. With draw-type val2, there's 7-bytes located here. The first 4-bytes located here is RGBA8888 pixel data, the rest is unknown.

With draw-type val2, texture5 is also used(this likely isn't used for the entire top-screen). With draw-type val2, an extra texture with the same format/dimensions as texture5 can be used, when the additional texture offset field is set.

Frame Types

FrameType	Description
2	Animated when pointer moved, split into 3 sections of 320*240 and displayed in the order 0 > 1 > 2
4	Animated when pointer moved, split into 3 sections of 320*240 and displayed in the order 0 > 1 > 2 > 1

Textures

ID	Color format	Texture display dimensions	Texture data dimensions	Description
0	Tiled RGB565	412x240	512x256	This is the texture used for the top-screen background, when the frame-type is set for this one.
1	Tiled RGB565	1008x240	1024x256	This is the texture used for the top-screen background, when the frame-type is set for this one.
2	Tiled RGB565	320x240	512x256	This is the texture used for the bottom-screen background, when the frame-type is set for this one.
3	Tiled RGB565	960x240	1024x256	This is the texture used for the bottom-screen background, when the frame-type is set for this one.
4	Tiled RGB565	1008x240	1024x256	This is the texture used for the bottom-screen background, when the frame-type is set for this one.
5	Tiled A8	64x64	64x64	This is used with the top-screen when top-screen draw-type is val2, see above.
6	Tiled BGR888	74x64	128x64	This is used for folder's on the main menu.
7	Tiled BGR888	82x64	128x64	This is used for open folder's on the main menu.
8	Tiled BGR888	36x72	64x128	This is used for 48x48 icon borders on the main menu.
9	Tiled BGR888	25x50	32x64	This is used for 24x24 icon borders on the main menu.

Audio data section

Offset	Size	Description
0x0	0x4	Unknown
0x4	0x4	Unknown
0x8		Beginning of the audio data entries.

The audio data section contains the sound effects for this theme.

Audio data entry structure:

Offset	Size	Description
0x0	Y (see below)	Additional data for CWAV 6, see below.
Y + 0x0	0x4	CWAV size.
Y + 0x4	0x4	Unknown
Y + 0x8	X (see below)	Additional data for CWAV 4, see below.
Y + 0x8 + X		CWAV

Structure of the data starting at offset 0x0, from the above entry, for the additional data with CWAV 7:

Relative offset	Size	Description
0x0	0x10	?

Y / the size of this block, is 0x10-bytes.

Structure of the data starting at offset 0x8, from the above entry, for the additional data with CWAV 4:

Relative offset	Size	Description
0x0	0x2C	?

X / the size of this block, is 0x2C-bytes.

It's unknown how exactly the number of CWAVs is controlled. The CWAVs are used for the following:

• 0: Cursor movement
• 1: Application launch
• 2: Certain buttons
• 3: Cancel buttons
• 4: When cursor would be moved off the screen, left/right
• 5: When cursor is moved a screen-worth of icons across
• 6: Folder buttons

Built-in themes

The built-in themes are stored at Home Menu RomFS:/theme/<Color>_LZ.bin, the format appears to be the same as body_LZ.bin in the theme DLC content.