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This directory contains the source code for the 'builtin' formats
converted with IMPORT. Here we implement three formats that require different
levels of processing: the GIF format uses LZW compression and a colormap for
pixel storage and requires the most work, Sun Rasterfiles have various formats
that may require colormap application or RLE decoding, and lastly the X
Window Dump format that fits the generic binary raster model with the exception
of an 8-bit file with a colormap.
Because formats are defined in the data base the user is unaware of
any special processing that occurs unless implementing a new format that
requires partivular handling. In the case of colormap files the example of
XWD can be followed and all that's needed is a routine to read the colormap
from the image. 'Builtin' formats must, however, be declared in the source
import$ipbuiltin.x to route execution to the format-specific code.
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