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": Describes the number of themes and languages in the control content.
• "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.

MetaDataContentHeader.bin format:

Relative offset	Size	Description
0x0	0x4	Version - always 0x1
0x4	0x4	Number of enabled themes
0x8	0x4	Total number of themes
0xC	0x4	Observed 0x300030
0x10	0x4	Magic, 0xDEADBEEF
0x14..0x2C	0x4	This data is sorted by region (JPN at 0x14, US at 0x18, etc.)
0x30	0x4	Number of ContentInfoArchive languages
0x34+i	0x2	ContentInfoArchive [[Nandrw/sys/SecureInfo_A|region]
0x36+i	0x2	ContentInfoArchive [[Config_Savegame#Languages|language]

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 (little endian)
0x4	0x4	0x0 = disabled, 0x1 = enabled.
0x8	0x40	char string for the title text.
0x48	0x80	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, 2 = solid color with textured squares, 3 = texture.
0x10	0x4	Top screen frame type, when draw-type is 3: 0 = texture1 (regular scrolling speed), 1 = texture0 (no scroll), 3 = texture1 (slow scrolling speed).
0x14	0x4	Offset for the top screen solid color data. Length of data is either 5 or 7, depending on whether the top screen's draw type is 1 or 2. If draw-type = 1, the first three bytes are the background colour, the next adjusts the background gradient (0=none, 255=fade all the way to white at the top), and the last controls the opacity of the squares that float in front of the background.
0x18	0x4	Top screen texture offset, see below.
0x1C	0x4	Additional top-screen texture offset, used with draw-type has value 2. 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 (regular scroll), 1 = texture2 (no scroll), 2 = texture3 (flipbook scroll, 0 > 1 > 2 > 0), 3 = texture4 (slow scroll), 4 = texture3 (flipbook scroll, 0 > 1 > 2 > 1 > 0).
0x28	0x4	Bottom Screen texture offset.
0x2C	0x4	Must be <2. 1 = enables usage of the following field.
0x30	0x4	Offset to a 0xC-byte block. The block contains four RGB888 colours that affect the cursor, as it expands and contracts. These are the border colour, main colour, unknown, and expanded glow colour.
0x34	0x4	Must be <2. 1 = enables usage of the following field.
0x38	0x4	Offset to a 0xC-byte block. The first six bytes of the block contain RGB888 colours for the 3d folder model. Specifically, its shadowed and main colours, in that order. The other six bytes are unknown.
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. Block contains three RGB888 colours that affect both the cart icon that appears for DSiWare, and the file graphic that appears in folders. In order: bottom shadow, main colour, highlight at the top (folder icon only). The remaining four bytes are of unknown purpose. This block may or may not also be responsible for coloring regular icons when a texture is not used.
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. Block contains three RGB888 colours controlling the buttons on the bottom screen with arrows on them - downwards sheen, main colour, leftwards sheen. The last four bytes are of unknown use. Note that the arrows themselves are coloured by the next field.
0x64	0x4	Must be <2. 1 = enables usage of the following field.
0x68	0x4	Offset to a 0x9-byte block. Block contains three RGB888 colors for the bottom screen arrows: edge colour, unpressed colour, and pressed colour. Note that this only controls the arrows themselves, not the rest of the button.
0x6C	0x4	Must be <2. 1 = enables usage of the following two fields.
0x70	0x4	Offset to a 0x20-byte block. Block contains rgb data for the open button that appears when an app is under the cursoron the bottom screen. The 1st 4 bytes are unknown, the next 9 bytes contain colour data for(in order 3 bytes each) button background when pressed, unpressed and border. the next 7 bytes are unknown. The next 9 bytes contain the data for the text in thes order button text shadow, button text unpressed and then pressed. the last 3 bytes are unknown
0x74	0x4	Offset to a 0x20-byte block. Block contains rgb data for the close button that appears when home button pressed from within a app. The 1st 4 bytes are unknown, the next 9 bytes contain colour data for(in order 3 bytes each) button background when pressed, unpressed and border. the next 7 bytes are unknown. The next 9 bytes contain the data for the text in thes order button text shadow, button text unpressed and then pressed. the last 3 bytes are unknown
0x78	0x4	Must be <3. 1 = enables usage of the following field.
0x7C	0x4	Offset to a 0xD-byte block that controls the text that appears above game icons when zoomed to the maximum level. First three bytes control background colour, next seven bytes are unknown, and the last three bytes control text colour.
0x80	0x4	Must be <2. 1 = enables usage of the following field.
0x84	0x4	Offset to a 0xD-byte block, related to the bottom screen icon area. Used when the draw-type is set to solid colour. Block contains three RGB888 colours (shadow colour at the top of empty slot, background colour, border colour/shadow colour for the rest of empty slot) and one RGBA8888 (shadow/glow around folder area).
0x88	0x4	Must be <2. 1 = enables usage of the following field.
0x8C	0x4	Offset to a 0x9-byte block, related to the bottom screen outer area. Used when the draw-type is set to solid colour. Block contains three RGB888 colours (bottom stripes, main background colour, subtle edge glow).
0x90	0x4	Must be <2. 1 = enables usage of the following field.
0x94	0x4	Offset to a 0xD-byte block related to the background of folders. Block contains three RGB888 colours (shadow colour at the top of empty slot, background colour, border colour/shadow colour for the rest of empty slot) and one RGBA8888 (shadow/glow around folder area).
0x98	0x4	Must be <2. 1 = enables usage of the following field.
0x9C	0x4	Offset to a 0x20-byte block. Related to the colour of the back arrow in folders.
0xA0	0x4	Must be <2. 1 = enables usage of the following field.
0xA4	0x4	Offset to a 0x15-byte block. The block contains seven RGB888 colours that affect the bottom bottom screen icon-resize and settings buttons. In order: left box shadow (subtle), background colour, border colour, icon gradient colour 1, icon gradient colour 2, pressed colour, right box shadow (subtle).
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. The middle two are unknown.
0xB0	0x4	Must be <2. 1 = enables usage of the following field.
0xB4	0x4	Offset to a 0x6-byte block. The block contains two RGB888 values: the background colour and text colour for the message that tells you how many demo uses you have remaining.
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 has value 2, 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. Used for backgrounds that don't scroll.
1	Tiled RGB565	1008x240	1024x256	This is the texture used for the top-screen background, when the frame-type is set for this one. Used for backgrounds that scroll.
2	Tiled RGB565	320x240	512x256	This is the texture used for the bottom-screen background, when the frame-type is set for this one. Used for backgrounds that don't scroll.
3	Tiled RGB565	960x240	1024x256	This is the texture used for the bottom-screen background, when the frame-type is set for this one. Split into three separate 320x240 textures that it jumps through like a flipbook.
4	Tiled RGB565	1008x240	1024x256	This is the texture used for the bottom-screen background, when the frame-type is set for this one. Used for backgrounds that scroll.
5	Tiled A8	64x64	64x64	This is used with the top-screen when top-screen draw-type is val2, see above. Used to tile the top screen in much the same way as the white squares that appear when no theme is selected.
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.Each .cwav has an 8 byte "header" before the "Magic" (cwav) the first two bytes tell the 3ds where the next audio entry isand is the same as its cwav's filesize (See below). Bytes 3 + 4 are zeroes and byte 5 controls the cwav's volume (0-100) the last three bytes are zeroes again

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.