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Difference between revisions of "AGI/Specifications/View"
AGI/Specifications/View (view source)
Revision as of 02:57, 23 January 2011
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===Cel data=== | ===Cel data=== | ||
The actual image data for each cel is stored using RLE (run length encoding) compression. This means that instead of having one byte for each single pixel (or 1/2 byte as you would use for 16 colors), each byte specifies how many pixels there are to be in a row and what | The actual image data for each cel is stored using RLE (run length encoding) compression. This means that instead of having one byte for each single pixel (or 1/2 byte as you would use for 16 colors), each byte specifies how many pixels there are to be in a row and what color they are. I will refer to these groups of pixels as "chunks". | ||
This method of compression is not very efficient if there is a lot of single pixels in the image (e.g. a view showing static on a TV screen), but in most cases it does save a fair amount of space. | This method of compression is not very efficient if there is a lot of single pixels in the image (e.g. a view showing static on a TV screen), but in most cases it does save a fair amount of space. | ||
Each line (not to be confused with a chunk) in the cel consists of several bytes of pixel data, then a 0 to end the line. Each byte of pixel data represents one chunk. The first four bits determine the | Each line (not to be confused with a chunk) in the cel consists of several bytes of pixel data, then a 0 to end the line. Each byte of pixel data represents one chunk. The first four bits determine the color, and the last four bits determine the number of pixels in the chunk. | ||
Example: AX BY CZ 00 | Example: AX BY CZ 00 | ||
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This line will have: | This line will have: | ||
* X pixels of | * X pixels of color A (AX) | ||
* Y pixels of | * Y pixels of color B (BY) | ||
* Z pixels of | * Z pixels of color C (CZ) | ||
* (then that will be the end of the line) (00) | * (then that will be the end of the line) (00) | ||