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File Structure documented
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_1.gif]]
[[Image:icon_2.gif]]
[[Image:icon_2.gif]]
[[Image:icon_4.gif]]
[[Image:icon_4.gif]]
[[Image:icon_5.gif]]
[[Image:icon_5.gif]]
== Basic File Structure ==
{| class="wikitable"
|- style="background-color: #ddd;"
! Start
! Length
! Description
|-
| 0x0000
| 2
| File Version/Magic (should be 0x0301)
|-
| 0x0002
| 2*4
| 4 CRC checksums
|-
| 0x000A
| 22
| Padding (00's)
|-
| 0x0020
| 512
| Default Bitmap
|-
| 0x0230
| 32
| Palette for above
|-
| 0x0250
| 256*8
| Application Title (in 8 languages), wide chars
|-
| 0x0A40
| 2048
| Padding (00's)
|-
| 0x1240
| 512*8
| 8 Bitmaps (for animation)
|-
| 0x2240
| 32*8
| 8 Palettes
|-
| 0x2340
| 80
| Animation Sequence
|}
Languages (in correct order) are: Japanese, English, French, German, Italian, Spanish, Unknown, Unknown.
== 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 ms)
| 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 RGB555 format (used since GBA).
The conversion to RGB888 is made like this (C):
u8 r = (color ) & 0x1f;
u8 g = (color >> 5) & 0x1f;
u8 b = (color >> 10) & 0x1f;
r = (r << 3) | (r >> 2);
g = (g << 3) | (g >> 2);
b = (b << 3) | (b >> 2);