Icon.bin

These are the banners you'll see in various places in the System Menu. They have the dimension 32x32 pixels.

These are converted by a tool blasty wrote. Icon files were supplied by loopy.

Basic File Structure

Start	Length	Description
0x0000	1	Number of titles (5+N)
0x0001	1	Animated (1=contains animated icon at 0x1240)
0x0002	2*4	4 CRC checksums (polynomial 0xA001)
0x000A	22	Padding (00's)
0x0020	512	Default Bitmap
0x0220	32	Palette for above
0x0240	256*16	Application Titles, wide chars
0x1240	512*8	8 Bitmaps (for animation)
0x2240	32*8	8 Palettes
0x2340	128	Animation Sequence

Languages (in correct order) are: Japanese, English, French, German, Italian, Spanish, ?Chinese?, Korean.

Animation Sequence

The sequence is represented by 2-byte tokens, in the following format (we're now talking bits, from left to right):

Length	Description	Mask
1	Flip Vertically	0x8000
1	Flip Horizontally	0x4000
3	Palette Index	0x3800
3	Bitmap Index	0x0700
8	Frame Duration (in frames (one frame = 1/60sec))	0x00FF

Both bytes being zero indicates the end of the sequence. If the first token is zero, the non-animated default image is shown.

Bitmap Format

The bitmap is tiled 8x8 pixels (Nintendo tends to do this). Each pixel contain 4 bits of data, being the index into the palette specified by the current sequence-token.

The Palettes

Each color in the palette is in the standard 2-byte RGB5551 format (used since GBA).

The conversion to RGB888 is made like this (C):

 u8 r = ((color      ) & 0x1f)<<3;
 u8 g = ((color >>  5) & 0x1f)<<3;
 u8 b = ((color >> 10) & 0x1f)<<3;

Checksums

The CRC-output is not bitwise inverted after the calculation, but it is byte-swapped to big-endian. Polynomial used is: 0xA001, same for all.

Number	Range
0	020-83F
1	020-93F
2	020-A3F
3	1240-23C0