DrvQueryTrueTypeTable function

The DrvQueryTrueTypeTable function accesses specific tables in a TrueType font-description file.

Syntax


LONG DrvQueryTrueTypeTable(
   ULONG_PTR iFile,
   ULONG     ulFont,
   ULONG     ulTag,
   PTRDIFF   dpStart,
   ULONG     cjBuf,
   BYTE      *pjBuf,
   PBYTE     *ppjTable,
   ULONG     *pcjTable
);

Parameters

iFile

Pointer to a driver-defined value that identifies the driver-provided TrueType font file. This pointer is obtained from DrvLoadFontFile.

ulFont

Specifies the one-based index of the driver font.

ulTag

Specifies the table to access. If ulTag is zero, the driver should return access to the entire file.

dpStart

Specifies the offset from the beginning of the tables from which to begin access. If ulTag is zero, dpStart is the offset from the beginning of the file.

cjBuf

Specifies the size in bytes of the buffer to which pjBuf points, or zero.

pjBuf

If not NULL, points to the buffer into which the driver should copy the table or font data.

ppjTable

If not NULL, points to the location in which the driver should return the address of the table or font data.

pcjTable

If not NULL, points to the location in which the driver should return the length in bytes of the table or font data to which *ppjTable points.

Return value

DrvQueryTrueTypeTable returns one of the following values:

  • If pjBuf is NULL, the number of bytes required for the buffer to hold the entire table (this would be the same as the value returned in pcjTable).
  • If pjBuf is not NULL, the number of bytes copied.
  • If an error occurs, FD_ERROR.

Remarks

DrvQueryTrueTypeTable must be implemented in TrueType font drivers.

There are two ways in which DrvQueryTrueTypeTable can be requested to return table or font data:

  1. When neither cjBuf nor pjBuf are NULL, the driver should copy the contents of the requested table into the buffer to which pjBuf points. In this situation, ppjTable and pcjTable will be NULL and should be ignored by the driver.

  2. When neither ppjTable nor pcjTable are NULL, the driver should place a pointer to the table in *ppjTable, and the length, in bytes, of the table in *pciTable. In this situation, cjBuf and pjBuf will be NULL and should be ignored by the driver.

Requirements

Target platform

Desktop

Header

Winddi.h (include Winddi.h)

See also

DrvLoadFontFile

 

 

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