| フィールド | 型 | コメント |
| BlockWidth | UB[4] |
Pixel width of each block in the grid. This value is stored as (actualWidth / 16) - 1, so possible block sizes are a multiple of 16 and not more than 256. |
| ImageWidth | UB[12] | Pixel width of the full image. |
| BlockHeight | UB[4] |
Pixel height of each block in the grid. This value is stored as (actualHeight / 16) - 1, so possible block sizes are a multiple of 16 and not more than 256. |
| ImageHeight | UB[12] | Pixel height of the full image. |
| Reserved | UB[6] | Must be 0 |
| HasIFrameImage | UB[1] | If 1, has IFrameImage |
| HasPaletteInfo | UB[1] | If 1, has PaletteInfo |
| PaletteInfo |
If HasPaletteInfo, IMAGEBLOCK |
One block of data to describe the palette. |
| ImageBlocks | IMAGEBLOCKV2[n] |
Blocks of image data. See Block format for details of how to calculate n. Blocks are ordered from bottom left to top right in rows and can be a combination of keyblocks and interblocks. |
| IFrameImage |
If HasIFrameImage, IMAGEBLOCKV2[n] |
Blocks of image data representing interblocks that must be combined with the previous keyblocks to produce the image. See Block format for details of how to calculate n. Blocks are ordered from bottom left to top right in rows. |
| フィールド | 型 | コメント |
| DataSize |
UB[16] Note: UB[16] is not the same as UI16; there is no byte swapping. |
Size of the compressed block data that follows, including the ImageFormat, ImageBlockHeader and Data fields. If this is an interframe, and this block has not changed since the last keyframe, DataSize is 0 and the Data field is absent. |
| Format | IMAGEFORMAT |
Compression format of block data. |
| ImageBlockHeader |
If Format’s HasDiffBlock = 1, IMAGEDIFFPOSITION If Format’s ZlibPrimeCompressCurrent = 1, IMAGEPRIMEPOSITION |
Describes the format and compression of Data |
| Data | If DataSize > 0, UI8[DataSize] |
Pixel data compressed using ZLIB. Pixels are ordered from bottom left to top right in rows. Each pixel is three bytes: B, G, R. |
| フィールド | 型 | コメント |
| Reserved | UB[3] | Must be 0 |
| ColorDepth | UB[2] |
00: 24-bit RGB image 10: 15/7-bit hybrid color image |
| HasDiffBlocks | UB[1] |
If 1, the data starts and stops on specific rows within the block and does not represent the entire block. |
| ZlibPrimeCompressCurrent | UB[1] |
If 1, the current data block was produced with the ZLIB priming technique of compression. |
| ZlibPrimeCompressPrevious | UB[1] |
If 1, the previous data block was produced with the ZLIB priming technique of compression. |
| フィールド | 型 | コメント |
| RowStart | UI8 |
Indicates the first scan line of the block that contains the image data. |
| Height | UI8 |
Indicates the height, in contiguous scan lines, of the image data. |
| フィールド | 型 | コメント |
| Block column | Ui8 |
Indicates the position of the source block. |
| Block row | Ui8 | Indicates the position |
