View source for Icon.bin

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

[[Image:icon_1.gif]]
[[Image:icon_2.gif]]
[[Image:icon_3.gif]]
[[Image:icon_4.gif]]
[[Image:icon_5.gif]]

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

== Basic File Structure ==
{| class="wikitable"
|- style="background-color: #ddd;"
! 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):
{| class="wikitable"
|- style="background-color: #ddd;"
! 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):
<source lang="c">
  u8 r = ((color      ) & 0x1f)<<3;
  u8 g = ((color >>  5) & 0x1f)<<3;
  u8 b = ((color >> 10) & 0x1f)<<3;
</source>

== 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.

{| class="wikitable"
|- style="background-color: #ddd;"
! Number
! Range
|-
| 0
| 020-83F
|-
| 1
| 020-93F
|-
| 2
| 020-A3F
|-
| 3
| 1240-23C0
|}