QuickTime 4 Reference

The Decompression Capabilities Structure

Your image decompressor component uses the decompression capabilities structure to report its capabilities to the base image decompressor.



 
struct ImageSubCodecDecompressCapabilities

{

    long recordSize; /* size of this record */

    long decompressRecordSize; /* size of decompress record */

    Boolean canAsync; /* true if supports asynch decompression */

};

typedef struct ImageSubCodecDecompressCapabilities ImageSubCodecDecompressCapabilities;

recordSize: The size of this ImageSubCodecDecompressCapabilities structure, in bytes.
decompressRecordSize: The size of the ImageSubCodecDecompressRecord structure that your image decompressor component requires. This structure is used to pass information from the ImageCodecBeginBand function to the ImageCodecDrawBand and ImageCodecEndBand functions.
canAsync: Specifies whether your image decompressor component can perform asynchronous scheduled decompression. This should be true unless your image decompressor component calls functions that cannot be called during interrupt time.