Tibia71SprExtractor

Reverse engineered as part of a bigger project to learn more about the Tibia 7.1 client, mostly for fun.

Images at the end of the readme show how the Tibia client reads a single sprite.

.spr structure

• U32 Version
• U16 Sprite count (SC)
• U32[SC] sprite start byte positions in file
• Sprite[SC] sprite structures

Sprite structure:

• U8 Transparent R
• U8 Transparent G
• U8 Transparent B
• U16 Byte length
• PixelData[Byte length] Sequence of PixelData

PixelData structure:

• U16 Amount of transparent pixels to skip ahead
• U16 Amount of colorful pixels to write before next PixelData or EOF
• Pixel[Colorful pixels]

Pixel structure:

• U8 Red
• U8 Green
• U8 Blue

Reading Tibia.spr:

Every sprite is 32x32.

Read U32 version
Read U16 SpriteCount
Loop i = 0..SpriteCount - 1
	SpritePositions[i] = Read U32 byte pos of sprite in file
Loop i = 0..SpriteCount - 1 
	If SpritePositions[i] < 1 Then Skip
	TransparentRed   = Read U8
	TransparentGreen = Read U8
	TransparentBlue  = Read U8
    SpriteEnd        = (Current byte position in file) + (Read U16 byte length)
	Sprite           = Create new Bitmap
	CurrentPixel     = 0
	Loop while current byte position in file < SpriteEnd
        TransparentPixelCount = Read U16
		CurrentPixel         += TransparentPixelCount
        ColorfulPixelCount    = Read U16
		Loop j = 0..ColorfulPixelCount
			Red   = Read U8
			Green = Read U8
			Blue  = Read U8
			X = CurrentPixel % 32
			Y = CurrentPixel / 32
			WritePixel(Sprite, X, Y, Red, Green, Blue)

Credits

@jo3bingham -- fairly certain I read one of their threads about Tibia file structures on an OT forum (although for another version of the client, it was still very helpful)

Tibia.exe -- everything else

Tibia.exe reading single sprite:

Initializating sprite:

Reading sprite: