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Diffstat (limited to 'pkg/dataio/import/bltins/README')
| -rw-r--r-- | pkg/dataio/import/bltins/README | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/pkg/dataio/import/bltins/README b/pkg/dataio/import/bltins/README new file mode 100644 index 00000000..c15b9cfe --- /dev/null +++ b/pkg/dataio/import/bltins/README @@ -0,0 +1,13 @@ + 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. |