Microsoft DirectDraw Surface (DDS) Feature Representation

In addition to the generic FME feature attributes that FME Workbench adds to all features (see About Feature Type Attributes), this format also adds format-specific attributes (Format Attributes).

DDS features specify a raster where each band is a 2D matrix of values representing red, green, blue, or alpha. Each raster corresponds to a single feature.

Attribute Name

Contents

dds_type

This will always be dds_raster.

Feature Type Format Attributes

Attribute Name

Contents

dds_compression_method

Sets the compression method for the raster.

Values: DXT1, DXT1A, DXT3, DXT5, ETC1

  • DXT1 and ETC1 produce approximately equivalent file sizes.
  • DXT3 and DXT5 give file sizes two times the size of DXT1 and ETC1.
  • DXT1 and ETC1 compressed files store RGB data.
  • DXT3 and DXT5 store RGBA data.
  • DXT1A is simply DXT1 compression with an alpha channel that can indicate full transparency or no transparency.

Default: DXT1

dds_compression_quality

Sets the quality of the raster post-compression.

Highest runs the slowest, but yields the best quality.

Values: Fastest, Fast, Normal, High, and Highest

Default: Normal