PDFCOMPRESSION (original) (raw)
Summary
The PDFCOMPRESSION structure provides information about PDF compression options.
Syntax
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 | [1] 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.