PDFCOMPRESSION

typedef struct tagPDFCOMPRESSION 
{ 
   L_UINT uStructSize; 
   L_UINT32 dwFlags; 
   PDFCOMP_1BITCOMPTYPE comp1Bit; 
   PDFCOMP_2BITCOMPTYPE comp2Bit; 
   PDFCOMP_PICTURECOMPTYPE compPicture; 
   L_INT nQFactor; 
} PDFCOMPRESSION, *LPPDFCOMPRESSION; 

The PDFCOMPRESSION structure provides information about PDF compression options.

Members

L_UINT uStructSize

Size of this structure in bytes, for versioning. Use the sizeof() operator to calculate this value.

L_UINT32 dwFlags

Flag that indicates which members contain valid data. You can combine values when appropriate by using a bitwise OR ( | ). The following are valid values:

Value Meaning
PDFCOMP_1BITCOMPTYPE_ENABLED [0] The comp1Bit member indicates the compression type to use for 1-bit segments/images.
PDFCOMP_2BITCOMPTYPE_ENABLED [2] The comp2Bit member indicates the compression type to use for 2-bit segments/images.
PDFCOMP_PICTURECOMPTYPE_ENABLED [4] The compPicture member indicates the compression type to use for Picture Compression segments/images.

PDFCOMP_1BITCOMPTYPE comp1Bit

Value that indicates the compression type to use for 1-bit segments/images. For possible values, refer to PDFCOMP_1BITCOMPTYPE.

PDFCOMP_2BITCOMPTYPE comp2Bit

Value that indicates the compression type to use for 2-bit segments/images. For possible values, refer to PDFCOMP_2BITCOMPTYPE.

PDFCOMP_PICTURECOMPTYPE compPicture

Value that indicates the compression type to use for Picture segments. For possible values, refer to PDFCOMP_PICTURECOMPTYPE.

L_INT nQFactor

QFactor to used with JPEG Compressions types. For a list of possible values, refer to Compression Quality Factors.

Comments

LPPDFCOMPRESSION is a pointer to a PDFCOMPRESSION structure. Where a function parameter type is LPPDFCOMPRESSION, declare a PDFCOMPRESSION variable and pass the variable's address in the parameter. Declaring an LPPDFCOMPRESSION variable is necessary only if the program requires a pointer.

The comp1Bit, comp2Bit and compPicture members are valid only if the appropriate value is set in dwFlags. This lets you set the compression type for 1-bit segments, for example, without affecting the compression of 2-bit or picture segments.

This structure is used with the L_PdfCompSetCompression function.

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