BCLIM (File Format)
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The BCLIM file format (Binary Citra Layout IMage) is used to store layout images on the Nintendo 3DS.
File Format
Header
The header is at the end of the file (to align the image data without the need for additional padding). It is always 0x14 bytes.
| Offset | Type | Description |
|---|---|---|
| 0x00 | Char[4] | File magic. Always CLIM in ASCII. |
| 0x04 | UInt16 | Byte-order-mark. FE FF for big endian, FF FE for little endian. |
| 0x06 | UInt16 | Header size, always 0x14. |
| 0x08 | UInt32 | Version of this file. |
| 0x0C | UInt32 | File size in bytes. |
| 0x10 | UInt16 | Number of data blocks, always 0x01. |
| 0x12 | UInt16 | Padding. |
Image Information
A section containing image information comes directly after header. It is always 0x14 bytes long.
| Offset | Type | Description |
|---|---|---|
| 0x00 | Char[4] | Section magic. Always imag in ASCII. |
| 0x04 | UInt32 | Parse information size. |
| 0x08 | UInt16 | Width of the texture in pixels. |
| 0x0A | UInt16 | Height of the texture in pixels. |
| 0x0C | UInt32 | Image format. See here for an explanation of all formats. |
Format
| ID | Name | Type | Bits Per Pixel (BPP) |
|---|---|---|---|
| 0x00 | L8 | Luminance | 8 |
| 0x01 | A8 | Alpha | 8 |
| 0x02 | LA4 | Luminance + Alpha | 8 |
| 0x03 | LA8 | Luminance + Alpha | 16 |
| 0x04 | HILO8 | ? | 16 |
| 0x05 | RGB565 | Color | 16 |
| 0x06 | RGB8 | Color | 32 |
| 0x07 | RGB5A1 | Color + Alpha | 16 |
| 0x08 | RGBA4 | Color + Alpha | 16 |
| 0x09 | RGBA8 | Color + Alpha | 32 |
| 0x0A | ETC1 | Color | 4 |
| 0x0B | ETC1A4 | Color + Alpha | 8 |
| 0x0C | L4 | Luminance | 4 |
| 0x0D | A4 | Alpha | 4 |
Tools
The following tools can handle BCLIM files:
