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OpenType Validation
<
table align=center
cellspacing=5 cellpadding=0 border=0>
<
tr><
td><
/td><
td><
a href="#FT_VALIDATE_OTXXX">FT_VALIDATE_OTXXX<
/a><
/td><
td><
/td><
td><
a href="#FT_OpenType_Validate">FT_OpenType_Validate<
/a><
/td><
td><
/td><
td><
a href="#FT_OpenType_Free">FT_OpenType_Free<
/a><
/td><
/tr>
<
p>This section contains the declaration of functions to validate some OpenType tables
(BASE, GDEF, GPOS, GSUB, JSTF, MATH
).<
/p>
<
h4><
a name="FT_VALIDATE_OTXXX">FT_VALIDATE_OTXXX<
/a><
/h4>
Defined in FT_OPENTYPE_VALIDATE_H (freetype/ftotval.h).
<
table align=center
width="87%"><
tr bgcolor="#D6E8FF"><
td><
pre>
#define <
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_BASE<
/a> 0x0100
#define <
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_GDEF<
/a> 0x0200
#define <
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_GPOS<
/a> 0x0400
#define <
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_GSUB<
/a> 0x0800
#define <
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_JSTF<
/a> 0x1000
#define <
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_MATH<
/a> 0x2000
#define <
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_OT<
/a> <
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_BASE<
/a> | \
<
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_GDEF<
/a> | \
<
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_GPOS<
/a> | \
<
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_GSUB<
/a> | \
<
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_JSTF<
/a> | \
<
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_MATH<
/a>
<
p>A list of bit-field constants used with <
a href="ft2-ot_validation.html#FT_OpenType_Validate">FT_OpenType_Validate<
/a> to indicate which OpenType tables should be validated.<
/p>
<
table cellpadding=3 border=0>
<
tr valign=top><
td><
b>FT_VALIDATE_BASE<
/b><
/td><
td>
<
p>Validate BASE table.<
/p>
<
tr valign=top><
td><
b>FT_VALIDATE_GDEF<
/b><
/td><
td>
<
p>Validate GDEF table.<
/p>
<
tr valign=top><
td><
b>FT_VALIDATE_GPOS<
/b><
/td><
td>
<
p>Validate GPOS table.<
/p>
<
tr valign=top><
td><
b>FT_VALIDATE_GSUB<
/b><
/td><
td>
<
p>Validate GSUB table.<
/p>
<
tr valign=top><
td><
b>FT_VALIDATE_JSTF<
/b><
/td><
td>
<
p>Validate JSTF table.<
/p>
<
tr valign=top><
td><
b>FT_VALIDATE_MATH<
/b><
/td><
td>
<
p>Validate MATH table.<
/p>
<
p>Validate all OpenType tables
(BASE, GDEF, GPOS, GSUB, JSTF, MATH
).<
/p>
<
h4><
a name="FT_OpenType_Validate">FT_OpenType_Validate<
/a><
/h4>
Defined in FT_OPENTYPE_VALIDATE_H (freetype/ftotval.h).
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table align=center
width="87%"><
tr bgcolor="#D6E8FF"><
td><
pre>
FT_EXPORT
( <
a href="ft2-basic_types.html#FT_Error">FT_Error<
/a>
)
<
b>FT_OpenType_Validate<
/b>
( <
a href="ft2-base_interface.html#FT_Face">FT_Face<
/a>
face,
<
a href="ft2-basic_types.html#FT_UInt">FT_UInt<
/a> validation_flags,
<
a href="ft2-basic_types.html#FT_Bytes">FT_Bytes<
/a> *BASE_table,
<
a href="ft2-basic_types.html#FT_Bytes">FT_Bytes<
/a> *GDEF_table,
<
a href="ft2-basic_types.html#FT_Bytes">FT_Bytes<
/a> *GPOS_table,
<
a href="ft2-basic_types.html#FT_Bytes">FT_Bytes<
/a> *GSUB_table,
<
a href="ft2-basic_types.html#FT_Bytes">FT_Bytes<
/a> *JSTF_table
);
<
p>Validate various OpenType tables to assure that all offsets and indices are valid. The idea is that a higher-level library which actually does the
text layout can access those tables without error checking
(which can be quite time consuming
).<
/p>
<
table cellpadding=3 border=0>
<
p>A handle to the input
face.<
/p>
<
tr valign=top><
td><
b>validation_flags<
/b><
/td><
td>
<
p>A bit field which specifies the tables to be validated. See <
a href="ft2-ot_validation.html#FT_VALIDATE_OTXXX">FT_VALIDATE_OTXXX<
/a>
for possible values.<
/p>
<
table cellpadding=3 border=0>
<
p>A pointer to the BASE table.<
/p>
<
p>A pointer to the GDEF table.<
/p>
<
p>A pointer to the GPOS table.<
/p>
<
p>A pointer to the GSUB table.<
/p>
<
p>A pointer to the JSTF table.<
/p>
<
p>FreeType error
code.
0 means success.<
/p>
<
p>This function only works with OpenType fonts, returning an error otherwise.<
/p>
<
p>After use, the application should deallocate the five tables with <
a href="ft2-ot_validation.html#FT_OpenType_Free">FT_OpenType_Free<
/a>. A NULL
value indicates that the table either doesn
't exist in the font, or the application hasn't asked
for validation.<
/p>
<
h4><
a name="FT_OpenType_Free">FT_OpenType_Free<
/a><
/h4>
Defined in FT_OPENTYPE_VALIDATE_H (freetype/ftotval.h).
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table align=center
width="87%"><
tr bgcolor="#D6E8FF"><
td><
pre>
FT_EXPORT
( <
span class="keyword">void<
/span>
)
<
b>FT_OpenType_Free<
/b>
( <
a href="ft2-base_interface.html#FT_Face">FT_Face<
/a>
face,
<
a href="ft2-basic_types.html#FT_Bytes">FT_Bytes<
/a> table
);
<
p>Free the buffer allocated by OpenType validator.<
/p>
<
table cellpadding=3 border=0>
<
p>A handle to the input
face.<
/p>
<
p>The pointer to the buffer that is allocated by <
a href="ft2-ot_validation.html#FT_OpenType_Validate">FT_OpenType_Validate<
/a>.<
/p>
<
p>This function must be used to free the buffer allocated by <
a href="ft2-ot_validation.html#FT_OpenType_Validate">FT_OpenType_Validate<
/a> only.<
/p>