Stripe image format: Difference between revisions
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Latest revision as of 21:47, 7 July 2024
The Stripe image format is the format in which, among other things, Layer 3 images are stored.
The image is stored as several horizontal or vertical "stripes" of tiles, each consisting of a four byte header followed by tile data (in YXPCCCTT format). Header format
|Byte 1| |Byte 2| |Byte 3| |Byte 4| EHHHYXyy yyyxxxxx DRLLLLLL llllllll
E = End of data HHH = Data destination (VRAM address, see below) Xxxxxx = X coordinate Yyyyyy = Y coordinate D = Direction (0 = Horizontal, 1 = Vertical) R = RLE (see below) LLLLLLllllllll = Length (amount of bytes to upload - 1)
RLE
If the RLE bit is set, the header is followed by a pair of bytes that gets repeated for a total of Length + 1 bytes. Data destinations
010 Layer 1 011 Layer 2 101 Layer 3