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Information Retrieval
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FreeType's header inclusion scheme
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Face Creation
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Font Testing Macros
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Sizing and Scaling
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Glyph Retrieval
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Character Mapping
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Information Retrieval
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Information Retrieval
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Synopsis
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FT_Get_Name_Index
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FT_Get_Glyph_Name
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FT_Get_Postscript_Name
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FT_Get_FSType_Flags
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FT_FSTYPE_XXX
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FT_Get_SubGlyph_Info
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FT_SUBGLYPH_FLAG_XXX
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Extended API
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Unicode Variation Sequences
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Glyph Layer Management
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Glyph Management
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The CFF driver
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The Type 1 and CID drivers
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The TrueType driver
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The PCF driver
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Outline Processing
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Quick retrieval of advance values
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Bitmap Handling
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Scanline Converter
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Glyph Stroker
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System Interface
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Module Management
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GZIP Streams
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LZW Streams
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BZIP2 Streams
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External Debugging APIs
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Error Codes
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Error Codes
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Error Enumerations
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Error Code Values
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Miscellaneous
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Miscellaneous
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TrueTypeGX/AAT Validation
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Incremental Loading
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The TrueType Engine
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OpenType Validation
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Table of contents
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<a href="#synopsis" class="md-nav__link">
Synopsis
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<li class="md-nav__item">
<a href="#ft_get_name_index" class="md-nav__link">
FT_Get_Name_Index
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<a href="#ft_get_glyph_name" class="md-nav__link">
FT_Get_Glyph_Name
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<a href="#ft_get_postscript_name" class="md-nav__link">
FT_Get_Postscript_Name
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FT_Get_SubGlyph_Info
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<p><a href="https://www.freetype.org">FreeType</a> » <a href="../">Docs</a> » <a href="index.html#core-api">Core API</a> » Information Retrieval</p>
<hr />
<h1 id="information-retrieval">Information Retrieval<a class="headerlink" href="#information-retrieval" title="Permanent link">¶</a></h1>
<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</a></h2>
<p>Functions to retrieve font and glyph information. Only some very basic data is covered; see also the chapter on the format-specific API for more.</p>
<h2 id="ft_get_name_index">FT_Get_Name_Index<a class="headerlink" href="#ft_get_name_index" title="Permanent link">¶</a></h2>
<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_uint">FT_UInt</a> )
<b>FT_Get_Name_Index</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a> face,
<span class="keyword">const</span> <a href="ft2-basic_types.html#ft_string">FT_String</a>* glyph_name );
</code></pre></div>
<p>Return the glyph index of a given glyph name. This only works for those faces where <code><a href="ft2-font_testing_macros.html#ft_has_glyph_names">FT_HAS_GLYPH_NAMES</a></code> returns true.</p>
<h4>input</h4>
<table class="fields">
<tr><td class="val" id="face">face</td><td class="desc">
<p>A handle to the source face object.</p>
</td></tr>
<tr><td class="val" id="glyph_name">glyph_name</td><td class="desc">
<p>The glyph name.</p>
</td></tr>
</table>
<h4>return</h4>
<p>The glyph index. 0 means ‘undefined character code’.</p>
<h4>note</h4>
<p>Acceptable glyph names might come from the <a href="https://github.com/adobe-type-tools/agl-aglfn">Adobe Glyph List</a>. See <code><a href="ft2-information_retrieval.html#ft_get_glyph_name">FT_Get_Glyph_Name</a></code> for the inverse functionality.</p>
<p>This function has limited capabilities if the config macro <code>FT_CONFIG_OPTION_POSTSCRIPT_NAMES</code> is not defined in <code>ftoption.h</code>: It then works only for fonts that actually embed glyph names (which many recent OpenType fonts do not).</p>
<hr>
<h2 id="ft_get_glyph_name">FT_Get_Glyph_Name<a class="headerlink" href="#ft_get_glyph_name" title="Permanent link">¶</a></h2>
<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
<b>FT_Get_Glyph_Name</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a> face,
<a href="ft2-basic_types.html#ft_uint">FT_UInt</a> glyph_index,
<a href="ft2-basic_types.html#ft_pointer">FT_Pointer</a> buffer,
<a href="ft2-basic_types.html#ft_uint">FT_UInt</a> buffer_max );
</code></pre></div>
<p>Retrieve the ASCII name of a given glyph in a face. This only works for those faces where <code><a href="ft2-font_testing_macros.html#ft_has_glyph_names">FT_HAS_GLYPH_NAMES</a></code> returns true.</p>
<h4>input</h4>
<table class="fields">
<tr><td class="val" id="face">face</td><td class="desc">
<p>A handle to a source face object.</p>
</td></tr>
<tr><td class="val" id="glyph_index">glyph_index</td><td class="desc">
<p>The glyph index.</p>
</td></tr>
<tr><td class="val" id="buffer_max">buffer_max</td><td class="desc">
<p>The maximum number of bytes available in the buffer.</p>
</td></tr>
</table>
<h4>output</h4>
<table class="fields">
<tr><td class="val" id="buffer">buffer</td><td class="desc">
<p>A pointer to a target buffer where the name is copied to.</p>
</td></tr>
</table>
<h4>return</h4>
<p>FreeType error code. 0 means success.</p>
<h4>note</h4>
<p>An error is returned if the face doesn't provide glyph names or if the glyph index is invalid. In all cases of failure, the first byte of <code>buffer</code> is set to 0 to indicate an empty name.</p>
<p>The glyph name is truncated to fit within the buffer if it is too long. The returned string is always zero-terminated.</p>
<p>Be aware that FreeType reorders glyph indices internally so that glyph index 0 always corresponds to the ‘missing glyph’ (called ‘.notdef’).</p>
<p>This function has limited capabilities if the config macro <code>FT_CONFIG_OPTION_POSTSCRIPT_NAMES</code> is not defined in <code>ftoption.h</code>: It then works only for fonts that actually embed glyph names (which many recent OpenType fonts do not).</p>
<hr>
<h2 id="ft_get_postscript_name">FT_Get_Postscript_Name<a class="headerlink" href="#ft_get_postscript_name" title="Permanent link">¶</a></h2>
<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">const</span> <span class="keyword">char</span>* )
<b>FT_Get_Postscript_Name</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a> face );
</code></pre></div>
<p>Retrieve the ASCII PostScript name of a given face, if available. This only works with PostScript, TrueType, and OpenType fonts.</p>
<h4>input</h4>
<table class="fields">
<tr><td class="val" id="face">face</td><td class="desc">
<p>A handle to the source face object.</p>
</td></tr>
</table>
<h4>return</h4>
<p>A pointer to the face's PostScript name. <code>NULL</code> if unavailable.</p>
<h4>note</h4>
<p>The returned pointer is owned by the face and is destroyed with it.</p>
<p>For variation fonts, this string changes if you select a different instance, and you have to call <code>FT_Get_PostScript_Name</code> again to retrieve it. FreeType follows Adobe TechNote #5902, ‘Generating PostScript Names for Fonts Using OpenType Font Variations’.</p>
<p><a href="https://download.macromedia.com/pub/developer/opentype/tech-notes/5902.AdobePSNameGeneration.html">https://download.macromedia.com/pub/developer/opentype/tech-notes/5902.AdobePSNameGeneration.html</a></p>
<p>[Since 2.9] Special PostScript names for named instances are only returned if the named instance is set with <code><a href="ft2-multiple_masters.html#ft_set_named_instance">FT_Set_Named_Instance</a></code> (and the font has corresponding entries in its ‘fvar’ table or is the default named instance). If <code><a href="ft2-font_testing_macros.html#ft_is_variation">FT_IS_VARIATION</a></code> returns true, the algorithmically derived PostScript name is provided, not looking up special entries for named instances.</p>
<hr>
<h2 id="ft_get_fstype_flags">FT_Get_FSType_Flags<a class="headerlink" href="#ft_get_fstype_flags" title="Permanent link">¶</a></h2>
<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_ushort">FT_UShort</a> )
<b>FT_Get_FSType_Flags</b>( <a href="ft2-face_creation.html#ft_face">FT_Face</a> face );
</code></pre></div>
<p>Return the <code>fsType</code> flags for a font.</p>
<h4>input</h4>
<table class="fields">
<tr><td class="val" id="face">face</td><td class="desc">
<p>A handle to the source face object.</p>
</td></tr>
</table>
<h4>return</h4>
<p>The <code>fsType</code> flags, see <code><a href="ft2-information_retrieval.html#ft_fstype_xxx">FT_FSTYPE_XXX</a></code>.</p>
<h4>note</h4>
<p>Use this function rather than directly reading the <code>fs_type</code> field in the <code><a href="ft2-type1_tables.html#ps_fontinforec">PS_FontInfoRec</a></code> structure, which is only guaranteed to return the correct results for Type 1 fonts.</p>
<h4>since</h4>
<p>2.3.8</p>
<hr>
<h2 id="ft_fstype_xxx">FT_FSTYPE_XXX<a class="headerlink" href="#ft_fstype_xxx" title="Permanent link">¶</a></h2>
<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<div class = "codehilite"><pre><code>#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_fstype_installable_embedding">FT_FSTYPE_INSTALLABLE_EMBEDDING</a> 0x0000
#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_fstype_restricted_license_embedding">FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING</a> 0x0002
#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_fstype_preview_and_print_embedding">FT_FSTYPE_PREVIEW_AND_PRINT_EMBEDDING</a> 0x0004
#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_fstype_editable_embedding">FT_FSTYPE_EDITABLE_EMBEDDING</a> 0x0008
#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_fstype_no_subsetting">FT_FSTYPE_NO_SUBSETTING</a> 0x0100
#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_fstype_bitmap_embedding_only">FT_FSTYPE_BITMAP_EMBEDDING_ONLY</a> 0x0200
</code></pre></div>
<p>A list of bit flags used in the <code>fsType</code> field of the OS/2 table in a TrueType or OpenType font and the <code>FSType</code> entry in a PostScript font. These bit flags are returned by <code><a href="ft2-information_retrieval.html#ft_get_fstype_flags">FT_Get_FSType_Flags</a></code>; they inform client applications of embedding and subsetting restrictions associated with a font.</p>
<p>See <a href="https://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/FontPolicies.pdf">https://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/FontPolicies.pdf</a> for more details.</p>
<h4>values</h4>
<table class="fields long">
<tr><td class="val" id="ft_fstype_installable_embedding">FT_FSTYPE_INSTALLABLE_EMBEDDING</td><td class="desc">
<p>Fonts with no fsType bit set may be embedded and permanently installed on the remote system by an application.</p>
</td></tr>
<tr><td class="val" id="ft_fstype_restricted_license_embedding">FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING</td><td class="desc">
<p>Fonts that have only this bit set must not be modified, embedded or exchanged in any manner without first obtaining permission of the font software copyright owner.</p>
</td></tr>
<tr><td class="val" id="ft_fstype_preview_and_print_embedding">FT_FSTYPE_PREVIEW_AND_PRINT_EMBEDDING</td><td class="desc">
<p>The font may be embedded and temporarily loaded on the remote system. Documents containing Preview & Print fonts must be opened ‘read-only’; no edits can be applied to the document.</p>
</td></tr>
<tr><td class="val" id="ft_fstype_editable_embedding">FT_FSTYPE_EDITABLE_EMBEDDING</td><td class="desc">
<p>The font may be embedded but must only be installed temporarily on other systems. In contrast to Preview & Print fonts, documents containing editable fonts may be opened for reading, editing is permitted, and changes may be saved.</p>
</td></tr>
<tr><td class="val" id="ft_fstype_no_subsetting">FT_FSTYPE_NO_SUBSETTING</td><td class="desc">
<p>The font may not be subsetted prior to embedding.</p>
</td></tr>
<tr><td class="val" id="ft_fstype_bitmap_embedding_only">FT_FSTYPE_BITMAP_EMBEDDING_ONLY</td><td class="desc">
<p>Only bitmaps contained in the font may be embedded; no outline data may be embedded. If there are no bitmaps available in the font, then the font is unembeddable.</p>
</td></tr>
</table>
<h4>note</h4>
<p>The flags are ORed together, thus more than a single value can be returned.</p>
<p>While the <code>fsType</code> flags can indicate that a font may be embedded, a license with the font vendor may be separately required to use the font in this way.</p>
<hr>
<h2 id="ft_get_subglyph_info">FT_Get_SubGlyph_Info<a class="headerlink" href="#ft_get_subglyph_info" title="Permanent link">¶</a></h2>
<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
<b>FT_Get_SubGlyph_Info</b>( <a href="ft2-glyph_retrieval.html#ft_glyphslot">FT_GlyphSlot</a> glyph,
<a href="ft2-basic_types.html#ft_uint">FT_UInt</a> sub_index,
<a href="ft2-basic_types.html#ft_int">FT_Int</a> *p_index,
<a href="ft2-basic_types.html#ft_uint">FT_UInt</a> *p_flags,
<a href="ft2-basic_types.html#ft_int">FT_Int</a> *p_arg1,
<a href="ft2-basic_types.html#ft_int">FT_Int</a> *p_arg2,
<a href="ft2-basic_types.html#ft_matrix">FT_Matrix</a> *p_transform );
</code></pre></div>
<p>Retrieve a description of a given subglyph. Only use it if <code>glyph->format</code> is <code><a href="ft2-basic_types.html#ft_glyph_format">FT_GLYPH_FORMAT_COMPOSITE</a></code>; an error is returned otherwise.</p>
<h4>input</h4>
<table class="fields">
<tr><td class="val" id="glyph">glyph</td><td class="desc">
<p>The source glyph slot.</p>
</td></tr>
<tr><td class="val" id="sub_index">sub_index</td><td class="desc">
<p>The index of the subglyph. Must be less than <code>glyph->num_subglyphs</code>.</p>
</td></tr>
</table>
<h4>output</h4>
<table class="fields">
<tr><td class="val" id="p_index">p_index</td><td class="desc">
<p>The glyph index of the subglyph.</p>
</td></tr>
<tr><td class="val" id="p_flags">p_flags</td><td class="desc">
<p>The subglyph flags, see <code><a href="ft2-information_retrieval.html#ft_subglyph_flag_xxx">FT_SUBGLYPH_FLAG_XXX</a></code>.</p>
</td></tr>
<tr><td class="val" id="p_arg1">p_arg1</td><td class="desc">
<p>The subglyph's first argument (if any).</p>
</td></tr>
<tr><td class="val" id="p_arg2">p_arg2</td><td class="desc">
<p>The subglyph's second argument (if any).</p>
</td></tr>
<tr><td class="val" id="p_transform">p_transform</td><td class="desc">
<p>The subglyph transformation (if any).</p>
</td></tr>
</table>
<h4>return</h4>
<p>FreeType error code. 0 means success.</p>
<h4>note</h4>
<p>The values of <code>*p_arg1</code>, <code>*p_arg2</code>, and <code>*p_transform</code> must be interpreted depending on the flags returned in <code>*p_flags</code>. See the OpenType specification for details.</p>
<p><a href="https://docs.microsoft.com/en-us/typography/opentype/spec/glyf#composite-glyph-description">https://docs.microsoft.com/en-us/typography/opentype/spec/glyf#composite-glyph-description</a></p>
<hr>
<h2 id="ft_subglyph_flag_xxx">FT_SUBGLYPH_FLAG_XXX<a class="headerlink" href="#ft_subglyph_flag_xxx" title="Permanent link">¶</a></h2>
<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<div class = "codehilite"><pre><code>#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_subglyph_flag_args_are_words">FT_SUBGLYPH_FLAG_ARGS_ARE_WORDS</a> 1
#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_subglyph_flag_args_are_xy_values">FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES</a> 2
#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_subglyph_flag_round_xy_to_grid">FT_SUBGLYPH_FLAG_ROUND_XY_TO_GRID</a> 4
#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_subglyph_flag_scale">FT_SUBGLYPH_FLAG_SCALE</a> 8
#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_subglyph_flag_xy_scale">FT_SUBGLYPH_FLAG_XY_SCALE</a> 0x40
#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_subglyph_flag_2x2">FT_SUBGLYPH_FLAG_2X2</a> 0x80
#<span class="keyword">define</span> <a href="ft2-information_retrieval.html#ft_subglyph_flag_use_my_metrics">FT_SUBGLYPH_FLAG_USE_MY_METRICS</a> 0x200
</code></pre></div>
<p>A list of constants describing subglyphs. Please refer to the ‘glyf’ table description in the OpenType specification for the meaning of the various flags (which get synthesized for non-OpenType subglyphs).</p>
<p><a href="https://docs.microsoft.com/en-us/typography/opentype/spec/glyf#composite-glyph-description">https://docs.microsoft.com/en-us/typography/opentype/spec/glyf#composite-glyph-description</a></p>
<h4>values</h4>
<table class="fields long">
<tr><td class="val" id="ft_subglyph_flag_args_are_words">FT_SUBGLYPH_FLAG_ARGS_ARE_WORDS</td><td class="desc">
</td></tr>
<tr><td class="val" id="ft_subglyph_flag_args_are_xy_values">FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES</td><td class="desc">
</td></tr>
<tr><td class="val" id="ft_subglyph_flag_round_xy_to_grid">FT_SUBGLYPH_FLAG_ROUND_XY_TO_GRID</td><td class="desc">
</td></tr>
<tr><td class="val" id="ft_subglyph_flag_scale">FT_SUBGLYPH_FLAG_SCALE</td><td class="desc">
</td></tr>
<tr><td class="val" id="ft_subglyph_flag_xy_scale">FT_SUBGLYPH_FLAG_XY_SCALE</td><td class="desc">
</td></tr>
<tr><td class="val" id="ft_subglyph_flag_2x2">FT_SUBGLYPH_FLAG_2X2</td><td class="desc">
</td></tr>
<tr><td class="val" id="ft_subglyph_flag_use_my_metrics">FT_SUBGLYPH_FLAG_USE_MY_METRICS</td><td class="desc">
</td></tr>
</table>
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