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<table class="index-toc-link"><tr><td class="left">[<a href="ft2-index.html">Index</a>]</td><td class="right">[<a href="ft2-toc.html">TOC</a>]</td></tr></table>
<h1>FreeType-2.5.5 API Reference</h1>
<h1>Basic Data Types</h1>
<h2>Synopsis</h2>
<table class="synopsis">
<tr><td><a href="#FT_Byte">FT_Byte</a></td><td><a href="#FT_Bool">FT_Bool</a></td><td><a href="#FT_UnitVector">FT_UnitVector</a></td></tr>
<tr><td><a href="#FT_Bytes">FT_Bytes</a></td><td><a href="#FT_Offset">FT_Offset</a></td><td><a href="#FT_F26Dot6">FT_F26Dot6</a></td></tr>
<tr><td><a href="#FT_Char">FT_Char</a></td><td><a href="#FT_PtrDist">FT_PtrDist</a></td><td><a href="#FT_Data">FT_Data</a></td></tr>
<tr><td><a href="#FT_Int">FT_Int</a></td><td><a href="#FT_String">FT_String</a></td><td> </td></tr>
<tr><td><a href="#FT_UInt">FT_UInt</a></td><td><a href="#FT_Tag">FT_Tag</a></td><td><a href="#FT_MAKE_TAG">FT_MAKE_TAG</a></td></tr>
<tr><td><a href="#FT_Int16">FT_Int16</a></td><td><a href="#FT_Error">FT_Error</a></td><td> </td></tr>
<tr><td><a href="#FT_UInt16">FT_UInt16</a></td><td><a href="#FT_Fixed">FT_Fixed</a></td><td><a href="#FT_Generic">FT_Generic</a></td></tr>
<tr><td><a href="#FT_Int32">FT_Int32</a></td><td><a href="#FT_Pointer">FT_Pointer</a></td><td><a href="#FT_Generic_Finalizer">FT_Generic_Finalizer</a></td></tr>
<tr><td><a href="#FT_UInt32">FT_UInt32</a></td><td><a href="#FT_Pos">FT_Pos</a></td><td> </td></tr>
<tr><td><a href="#FT_Int64">FT_Int64</a></td><td><a href="#FT_Vector">FT_Vector</a></td><td><a href="#FT_Bitmap">FT_Bitmap</a></td></tr>
<tr><td><a href="#FT_UInt64">FT_UInt64</a></td><td><a href="#FT_BBox">FT_BBox</a></td><td><a href="#FT_Pixel_Mode">FT_Pixel_Mode</a></td></tr>
<tr><td><a href="#FT_Short">FT_Short</a></td><td><a href="#FT_Matrix">FT_Matrix</a></td><td><a href="#FT_Palette_Mode">FT_Palette_Mode</a></td></tr>
<tr><td><a href="#FT_UShort">FT_UShort</a></td><td><a href="#FT_FWord">FT_FWord</a></td><td><a href="#FT_Glyph_Format">FT_Glyph_Format</a></td></tr>
<tr><td><a href="#FT_Long">FT_Long</a></td><td><a href="#FT_UFWord">FT_UFWord</a></td><td><a href="#FT_IMAGE_TAG">FT_IMAGE_TAG</a></td></tr>
<tr><td><a href="#FT_ULong">FT_ULong</a></td><td><a href="#FT_F2Dot14">FT_F2Dot14</a></td><td></td></tr>
</table>
<p>This section contains the basic data types defined by FreeType 2, ranging from simple scalar types to bitmap descriptors. More font-specific structures are defined in a different section.</p>
<div class="section">
<h3 id="FT_Byte">FT_Byte</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">unsigned</span> <span class="keyword">char</span> <b>FT_Byte</b>;
</pre>
<p>A simple typedef for the <i>unsigned</i> char type.</p>
<hr>
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<div class="section">
<h3 id="FT_Bytes">FT_Bytes</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">const</span> <a href="ft2-basic_types.html#FT_Byte">FT_Byte</a>* <b>FT_Bytes</b>;
</pre>
<p>A typedef for constant memory areas.</p>
<hr>
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<div class="section">
<h3 id="FT_Char">FT_Char</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> <span class="keyword">char</span> <b>FT_Char</b>;
</pre>
<p>A simple typedef for the <i>signed</i> char type.</p>
<hr>
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<div class="section">
<h3 id="FT_Int">FT_Int</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> <span class="keyword">int</span> <b>FT_Int</b>;
</pre>
<p>A typedef for the int type.</p>
<hr>
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<div class="section">
<h3 id="FT_UInt">FT_UInt</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <b>FT_UInt</b>;
</pre>
<p>A typedef for the unsigned int type.</p>
<hr>
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<div class="section">
<h3 id="FT_Int16">FT_Int16</h3>
<p>Defined in FT_CONFIG_CONFIG_H (config/ftconfig.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> <span class="keyword">short</span> <b>FT_Int16</b>;
</pre>
<p>A typedef for a 16bit signed integer type.</p>
<hr>
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<div class="section">
<h3 id="FT_UInt16">FT_UInt16</h3>
<p>Defined in FT_CONFIG_CONFIG_H (config/ftconfig.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">unsigned</span> <span class="keyword">short</span> <b>FT_UInt16</b>;
</pre>
<p>A typedef for a 16bit unsigned integer type.</p>
<hr>
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<div class="section">
<h3 id="FT_Int32">FT_Int32</h3>
<p>Defined in FT_CONFIG_CONFIG_H (config/ftconfig.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> XXX <b>FT_Int32</b>;
</pre>
<p>A typedef for a 32bit signed integer type. The size depends on the configuration.</p>
<hr>
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<div class="section">
<h3 id="FT_UInt32">FT_UInt32</h3>
<p>Defined in FT_CONFIG_CONFIG_H (config/ftconfig.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">unsigned</span> XXX <b>FT_UInt32</b>;
</pre>
<hr>
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<div class="section">
<h3 id="FT_Int64">FT_Int64</h3>
<p>Defined in FT_CONFIG_CONFIG_H (config/ftconfig.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> XXX <b>FT_Int64</b>;
</pre>
<hr>
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<div class="section">
<h3 id="FT_UInt64">FT_UInt64</h3>
<p>Defined in FT_CONFIG_CONFIG_H (config/ftconfig.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">unsigned</span> XXX <b>FT_UInt64</b>;
</pre>
<hr>
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<div class="section">
<h3 id="FT_Short">FT_Short</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> <span class="keyword">short</span> <b>FT_Short</b>;
</pre>
<p>A typedef for signed short.</p>
<hr>
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<div class="section">
<h3 id="FT_UShort">FT_UShort</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">unsigned</span> <span class="keyword">short</span> <b>FT_UShort</b>;
</pre>
<p>A typedef for unsigned short.</p>
<hr>
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<div class="section">
<h3 id="FT_Long">FT_Long</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> <span class="keyword">long</span> <b>FT_Long</b>;
</pre>
<p>A typedef for signed long.</p>
<hr>
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<div class="section">
<h3 id="FT_ULong">FT_ULong</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">unsigned</span> <span class="keyword">long</span> <b>FT_ULong</b>;
</pre>
<p>A typedef for unsigned long.</p>
<hr>
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<div class="section">
<h3 id="FT_Bool">FT_Bool</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">unsigned</span> <span class="keyword">char</span> <b>FT_Bool</b>;
</pre>
<p>A typedef of unsigned char, used for simple booleans. As usual, values 1 and 0 represent true and false, respectively.</p>
<hr>
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<div class="section">
<h3 id="FT_Offset">FT_Offset</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> size_t <b>FT_Offset</b>;
</pre>
<p>This is equivalent to the ANSI C ‘size_t’ type, i.e., the largest <i>unsigned</i> integer type used to express a file size or position, or a memory block size.</p>
<hr>
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<div class="section">
<h3 id="FT_PtrDist">FT_PtrDist</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> ft_ptrdiff_t <b>FT_PtrDist</b>;
</pre>
<p>This is equivalent to the ANSI C ‘ptrdiff_t’ type, i.e., the largest <i>signed</i> integer type used to express the distance between two pointers.</p>
<hr>
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<div class="section">
<h3 id="FT_String">FT_String</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">char</span> <b>FT_String</b>;
</pre>
<p>A simple typedef for the char type, usually used for strings.</p>
<hr>
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<div class="section">
<h3 id="FT_Tag">FT_Tag</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <a href="ft2-basic_types.html#FT_UInt32">FT_UInt32</a> <b>FT_Tag</b>;
</pre>
<p>A typedef for 32-bit tags (as used in the SFNT format).</p>
<hr>
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<div class="section">
<h3 id="FT_Error">FT_Error</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">int</span> <b>FT_Error</b>;
</pre>
<p>The FreeType error code type. A value of 0 is always interpreted as a successful operation.</p>
<hr>
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<div class="section">
<h3 id="FT_Fixed">FT_Fixed</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> <span class="keyword">long</span> <b>FT_Fixed</b>;
</pre>
<p>This type is used to store 16.16 fixed-point values, like scaling values or matrix coefficients.</p>
<hr>
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<div class="section">
<h3 id="FT_Pointer">FT_Pointer</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">void</span>* <b>FT_Pointer</b>;
</pre>
<p>A simple typedef for a typeless pointer.</p>
<hr>
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<div class="section">
<h3 id="FT_Pos">FT_Pos</h3>
<p>Defined in FT_IMAGE_H (ftimage.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> <span class="keyword">long</span> <b>FT_Pos</b>;
</pre>
<p>The type FT_Pos is used to store vectorial coordinates. Depending on the context, these can represent distances in integer font units, or 16.16, or 26.6 fixed-point pixel coordinates.</p>
<hr>
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<div class="section">
<h3 id="FT_Vector">FT_Vector</h3>
<p>Defined in FT_IMAGE_H (ftimage.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Vector_
{
<a href="ft2-basic_types.html#FT_Pos">FT_Pos</a> x;
<a href="ft2-basic_types.html#FT_Pos">FT_Pos</a> y;
} <b>FT_Vector</b>;
</pre>
<p>A simple structure used to store a 2D vector; coordinates are of the FT_Pos type.</p>
<h4>fields</h4>
<table class="fields">
<tr><td class="val" id="x">x</td><td class="desc">
<p>The horizontal coordinate.</p>
</td></tr>
<tr><td class="val" id="y">y</td><td class="desc">
<p>The vertical coordinate.</p>
</td></tr>
</table>
<hr>
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<div class="section">
<h3 id="FT_BBox">FT_BBox</h3>
<p>Defined in FT_IMAGE_H (ftimage.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">struct</span> FT_BBox_
{
<a href="ft2-basic_types.html#FT_Pos">FT_Pos</a> xMin, yMin;
<a href="ft2-basic_types.html#FT_Pos">FT_Pos</a> xMax, yMax;
} <b>FT_BBox</b>;
</pre>
<p>A structure used to hold an outline's bounding box, i.e., the coordinates of its extrema in the horizontal and vertical directions.</p>
<h4>fields</h4>
<table class="fields">
<tr><td class="val" id="xMin">xMin</td><td class="desc">
<p>The horizontal minimum (left-most).</p>
</td></tr>
<tr><td class="val" id="yMin">yMin</td><td class="desc">
<p>The vertical minimum (bottom-most).</p>
</td></tr>
<tr><td class="val" id="xMax">xMax</td><td class="desc">
<p>The horizontal maximum (right-most).</p>
</td></tr>
<tr><td class="val" id="yMax">yMax</td><td class="desc">
<p>The vertical maximum (top-most).</p>
</td></tr>
</table>
<h4>note</h4>
<p>The bounding box is specified with the coordinates of the lower left and the upper right corner. In PostScript, those values are often called (llx,lly) and (urx,ury), respectively.</p>
<p>If ‘yMin’ is negative, this value gives the glyph's descender. Otherwise, the glyph doesn't descend below the baseline. Similarly, if ‘ymax’ is positive, this value gives the glyph's ascender.</p>
<p>‘xMin’ gives the horizontal distance from the glyph's origin to the left edge of the glyph's bounding box. If ‘xMin’ is negative, the glyph extends to the left of the origin.</p>
<hr>
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<div class="section">
<h3 id="FT_Matrix">FT_Matrix</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Matrix_
{
<a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> xx, xy;
<a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> yx, yy;
} <b>FT_Matrix</b>;
</pre>
<p>A simple structure used to store a 2x2 matrix. Coefficients are in 16.16 fixed-point format. The computation performed is:</p>
<pre class="colored">
x' = x*xx + y*xy
y' = x*yx + y*yy
</pre>
<h4>fields</h4>
<table class="fields">
<tr><td class="val" id="xx">xx</td><td class="desc">
<p>Matrix coefficient.</p>
</td></tr>
<tr><td class="val" id="xy">xy</td><td class="desc">
<p>Matrix coefficient.</p>
</td></tr>
<tr><td class="val" id="yx">yx</td><td class="desc">
<p>Matrix coefficient.</p>
</td></tr>
<tr><td class="val" id="yy">yy</td><td class="desc">
<p>Matrix coefficient.</p>
</td></tr>
</table>
<hr>
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<div class="section">
<h3 id="FT_FWord">FT_FWord</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> <span class="keyword">short</span> <b>FT_FWord</b>; /* distance in FUnits */
</pre>
<p>A signed 16-bit integer used to store a distance in original font units.</p>
<hr>
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<div class="section">
<h3 id="FT_UFWord">FT_UFWord</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">unsigned</span> <span class="keyword">short</span> <b>FT_UFWord</b>; /* <span class="keyword">unsigned</span> distance */
</pre>
<p>An unsigned 16-bit integer used to store a distance in original font units.</p>
<hr>
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<div class="section">
<h3 id="FT_F2Dot14">FT_F2Dot14</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> <span class="keyword">short</span> <b>FT_F2Dot14</b>;
</pre>
<p>A signed 2.14 fixed-point type used for unit vectors.</p>
<hr>
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<div class="section">
<h3 id="FT_UnitVector">FT_UnitVector</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">struct</span> FT_UnitVector_
{
<a href="ft2-basic_types.html#FT_F2Dot14">FT_F2Dot14</a> x;
<a href="ft2-basic_types.html#FT_F2Dot14">FT_F2Dot14</a> y;
} <b>FT_UnitVector</b>;
</pre>
<p>A simple structure used to store a 2D vector unit vector. Uses FT_F2Dot14 types.</p>
<h4>fields</h4>
<table class="fields">
<tr><td class="val" id="x">x</td><td class="desc">
<p>Horizontal coordinate.</p>
</td></tr>
<tr><td class="val" id="y">y</td><td class="desc">
<p>Vertical coordinate.</p>
</td></tr>
</table>
<hr>
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<div class="section">
<h3 id="FT_F26Dot6">FT_F26Dot6</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">signed</span> <span class="keyword">long</span> <b>FT_F26Dot6</b>;
</pre>
<p>A signed 26.6 fixed-point type used for vectorial pixel coordinates.</p>
<hr>
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<div class="section">
<h3 id="FT_Data">FT_Data</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Data_
{
<span class="keyword">const</span> <a href="ft2-basic_types.html#FT_Byte">FT_Byte</a>* pointer;
<a href="ft2-basic_types.html#FT_Int">FT_Int</a> length;
} <b>FT_Data</b>;
</pre>
<p>Read-only binary data represented as a pointer and a length.</p>
<h4>fields</h4>
<table class="fields">
<tr><td class="val" id="pointer">pointer</td><td class="desc">
<p>The data.</p>
</td></tr>
<tr><td class="val" id="length">length</td><td class="desc">
<p>The length of the data in bytes.</p>
</td></tr>
</table>
<hr>
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<div class="section">
<h3 id="FT_MAKE_TAG">FT_MAKE_TAG</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
#define <b>FT_MAKE_TAG</b>( _x1, _x2, _x3, _x4 ) \
(<a href="ft2-basic_types.html#FT_Tag">FT_Tag</a>) \
( ( (<a href="ft2-basic_types.html#FT_ULong">FT_ULong</a>)_x1 << 24 ) | \
( (<a href="ft2-basic_types.html#FT_ULong">FT_ULong</a>)_x2 << 16 ) | \
( (<a href="ft2-basic_types.html#FT_ULong">FT_ULong</a>)_x3 << 8 ) | \
(<a href="ft2-basic_types.html#FT_ULong">FT_ULong</a>)_x4 )
</pre>
<p>This macro converts four-letter tags that are used to label TrueType tables into an unsigned long, to be used within FreeType.</p>
<h4>note</h4>
<p>The produced values <b>must</b> be 32-bit integers. Don't redefine this macro.</p>
<hr>
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<div class="section">
<h3 id="FT_Generic">FT_Generic</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Generic_
{
<span class="keyword">void</span>* data;
<a href="ft2-basic_types.html#FT_Generic_Finalizer">FT_Generic_Finalizer</a> finalizer;
} <b>FT_Generic</b>;
</pre>
<p>Client applications often need to associate their own data to a variety of FreeType core objects. For example, a text layout API might want to associate a glyph cache to a given size object.</p>
<p>Some FreeType object contains a ‘generic’ field, of type FT_Generic, which usage is left to client applications and font servers.</p>
<p>It can be used to store a pointer to client-specific data, as well as the address of a ‘finalizer’ function, which will be called by FreeType when the object is destroyed (for example, the previous client example would put the address of the glyph cache destructor in the ‘finalizer’ field).</p>
<h4>fields</h4>
<table class="fields">
<tr><td class="val" id="data">data</td><td class="desc">
<p>A typeless pointer to any client-specified data. This field is completely ignored by the FreeType library.</p>
</td></tr>
<tr><td class="val" id="finalizer">finalizer</td><td class="desc">
<p>A pointer to a ‘generic finalizer’ function, which will be called when the object is destroyed. If this field is set to NULL, no code will be called.</p>
</td></tr>
</table>
<hr>
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<div class="section">
<h3 id="FT_Generic_Finalizer">FT_Generic_Finalizer</h3>
<p>Defined in FT_TYPES_H (fttypes.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">void</span> (*<b>FT_Generic_Finalizer</b>)(<span class="keyword">void</span>* object);
</pre>
<p>Describe a function used to destroy the ‘client’ data of any FreeType object. See the description of the <a href="ft2-basic_types.html#FT_Generic">FT_Generic</a> type for details of usage.</p>
<h4>input</h4>
<p>The address of the FreeType object that is under finalization. Its client data is accessed through its ‘generic’ field.</p>
<hr>
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<div class="section">
<h3 id="FT_Bitmap">FT_Bitmap</h3>
<p>Defined in FT_IMAGE_H (ftimage.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Bitmap_
{
<span class="keyword">unsigned</span> <span class="keyword">int</span> rows;
<span class="keyword">unsigned</span> <span class="keyword">int</span> width;
<span class="keyword">int</span> pitch;
<span class="keyword">unsigned</span> <span class="keyword">char</span>* buffer;
<span class="keyword">unsigned</span> <span class="keyword">short</span> num_grays;
<span class="keyword">unsigned</span> <span class="keyword">char</span> pixel_mode;
<span class="keyword">unsigned</span> <span class="keyword">char</span> palette_mode;
<span class="keyword">void</span>* palette;
} <b>FT_Bitmap</b>;
</pre>
<p>A structure used to describe a bitmap or pixmap to the raster. Note that we now manage pixmaps of various depths through the ‘pixel_mode’ field.</p>
<h4>fields</h4>
<table class="fields">
<tr><td class="val" id="rows">rows</td><td class="desc">
<p>The number of bitmap rows.</p>
</td></tr>
<tr><td class="val" id="width">width</td><td class="desc">
<p>The number of pixels in bitmap row.</p>
</td></tr>
<tr><td class="val" id="pitch">pitch</td><td class="desc">
<p>The pitch's absolute value is the number of bytes taken by one bitmap row, including padding. However, the pitch is positive when the bitmap has a ‘down’ flow, and negative when it has an ‘up’ flow. In all cases, the pitch is an offset to add to a bitmap pointer in order to go down one row.</p>
<p>Note that ‘padding’ means the alignment of a bitmap to a byte border, and FreeType functions normally align to the smallest possible integer value.</p>
<p>For the B/W rasterizer, ‘pitch’ is always an even number.</p>
<p>To change the pitch of a bitmap (say, to make it a multiple of 4), use <a href="ft2-bitmap_handling.html#FT_Bitmap_Convert">FT_Bitmap_Convert</a>. Alternatively, you might use callback functions to directly render to the application's surface; see the file ‘example2.cpp’ in the tutorial for a demonstration.</p>
</td></tr>
<tr><td class="val" id="buffer">buffer</td><td class="desc">
<p>A typeless pointer to the bitmap buffer. This value should be aligned on 32-bit boundaries in most cases.</p>
</td></tr>
<tr><td class="val" id="num_grays">num_grays</td><td class="desc">
<p>This field is only used with <a href="ft2-basic_types.html#FT_Pixel_Mode">FT_PIXEL_MODE_GRAY</a>; it gives the number of gray levels used in the bitmap.</p>
</td></tr>
<tr><td class="val" id="pixel_mode">pixel_mode</td><td class="desc">
<p>The pixel mode, i.e., how pixel bits are stored. See <a href="ft2-basic_types.html#FT_Pixel_Mode">FT_Pixel_Mode</a> for possible values.</p>
</td></tr>
<tr><td class="val" id="palette_mode">palette_mode</td><td class="desc">
<p>This field is intended for paletted pixel modes; it indicates how the palette is stored. Not used currently.</p>
</td></tr>
<tr><td class="val" id="palette">palette</td><td class="desc">
<p>A typeless pointer to the bitmap palette; this field is intended for paletted pixel modes. Not used currently.</p>
</td></tr>
</table>
<h4>note</h4>
<p>For now, the only pixel modes supported by FreeType are mono and grays. However, drivers might be added in the future to support more ‘colorful’ options.</p>
<hr>
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<div class="section">
<h3 id="FT_Pixel_Mode">FT_Pixel_Mode</h3>
<p>Defined in FT_IMAGE_H (ftimage.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">enum</span> FT_Pixel_Mode_
{
<a href="ft2-basic_types.html#FT_PIXEL_MODE_NONE">FT_PIXEL_MODE_NONE</a> = 0,
<a href="ft2-basic_types.html#FT_PIXEL_MODE_MONO">FT_PIXEL_MODE_MONO</a>,
<a href="ft2-basic_types.html#FT_PIXEL_MODE_GRAY">FT_PIXEL_MODE_GRAY</a>,
<a href="ft2-basic_types.html#FT_PIXEL_MODE_GRAY2">FT_PIXEL_MODE_GRAY2</a>,
<a href="ft2-basic_types.html#FT_PIXEL_MODE_GRAY4">FT_PIXEL_MODE_GRAY4</a>,
<a href="ft2-basic_types.html#FT_PIXEL_MODE_LCD">FT_PIXEL_MODE_LCD</a>,
<a href="ft2-basic_types.html#FT_PIXEL_MODE_LCD_V">FT_PIXEL_MODE_LCD_V</a>,
<a href="ft2-basic_types.html#FT_PIXEL_MODE_BGRA">FT_PIXEL_MODE_BGRA</a>,
FT_PIXEL_MODE_MAX /* do not remove */
} <b>FT_Pixel_Mode</b>;
/* these constants are deprecated; use the corresponding `<b>FT_Pixel_Mode</b>' */
/* values instead. */
#define ft_pixel_mode_none <a href="ft2-basic_types.html#FT_PIXEL_MODE_NONE">FT_PIXEL_MODE_NONE</a>
#define ft_pixel_mode_mono <a href="ft2-basic_types.html#FT_PIXEL_MODE_MONO">FT_PIXEL_MODE_MONO</a>
#define ft_pixel_mode_grays <a href="ft2-basic_types.html#FT_PIXEL_MODE_GRAY">FT_PIXEL_MODE_GRAY</a>
#define ft_pixel_mode_pal2 <a href="ft2-basic_types.html#FT_PIXEL_MODE_GRAY2">FT_PIXEL_MODE_GRAY2</a>
#define ft_pixel_mode_pal4 <a href="ft2-basic_types.html#FT_PIXEL_MODE_GRAY4">FT_PIXEL_MODE_GRAY4</a>
</pre>
<p>An enumeration type used to describe the format of pixels in a given bitmap. Note that additional formats may be added in the future.</p>
<h4>values</h4>
<table class="fields">
<tr><td class="val" id="FT_PIXEL_MODE_NONE">FT_PIXEL_MODE_NONE</td><td class="desc">
<p>Value 0 is reserved.</p>
</td></tr>
<tr><td class="val" id="FT_PIXEL_MODE_MONO">FT_PIXEL_MODE_MONO</td><td class="desc">
<p>A monochrome bitmap, using 1 bit per pixel. Note that pixels are stored in most-significant order (MSB), which means that the left-most pixel in a byte has value 128.</p>
</td></tr>
<tr><td class="val" id="FT_PIXEL_MODE_GRAY">FT_PIXEL_MODE_GRAY</td><td class="desc">
<p>An 8-bit bitmap, generally used to represent anti-aliased glyph images. Each pixel is stored in one byte. Note that the number of ‘gray’ levels is stored in the ‘num_grays’ field of the <a href="ft2-basic_types.html#FT_Bitmap">FT_Bitmap</a> structure (it generally is 256).</p>
</td></tr>
<tr><td class="val" id="FT_PIXEL_MODE_GRAY2">FT_PIXEL_MODE_GRAY2</td><td class="desc">
<p>A 2-bit per pixel bitmap, used to represent embedded anti-aliased bitmaps in font files according to the OpenType specification. We haven't found a single font using this format, however.</p>
</td></tr>
<tr><td class="val" id="FT_PIXEL_MODE_GRAY4">FT_PIXEL_MODE_GRAY4</td><td class="desc">
<p>A 4-bit per pixel bitmap, representing embedded anti-aliased bitmaps in font files according to the OpenType specification. We haven't found a single font using this format, however.</p>
</td></tr>
<tr><td class="val" id="FT_PIXEL_MODE_LCD">FT_PIXEL_MODE_LCD</td><td class="desc">
<p>An 8-bit bitmap, representing RGB or BGR decimated glyph images used for display on LCD displays; the bitmap is three times wider than the original glyph image. See also <a href="ft2-base_interface.html#FT_Render_Mode">FT_RENDER_MODE_LCD</a>.</p>
</td></tr>
<tr><td class="val" id="FT_PIXEL_MODE_LCD_V">FT_PIXEL_MODE_LCD_V</td><td class="desc">
<p>An 8-bit bitmap, representing RGB or BGR decimated glyph images used for display on rotated LCD displays; the bitmap is three times taller than the original glyph image. See also <a href="ft2-base_interface.html#FT_Render_Mode">FT_RENDER_MODE_LCD_V</a>.</p>
</td></tr>
<tr><td class="val" id="FT_PIXEL_MODE_BGRA">FT_PIXEL_MODE_BGRA</td><td class="desc">
<p>An image with four 8-bit channels per pixel, representing a color image (such as emoticons) with alpha channel. For each pixel, the format is BGRA, which means, the blue channel comes first in memory. The color channels are pre-multiplied and in the sRGB colorspace. For example, full red at half-translucent opacity will be represented as ‘00,00,80,80’, not ‘00,00,FF,80’. See also <a href="ft2-base_interface.html#FT_LOAD_XXX">FT_LOAD_COLOR</a>.</p>
</td></tr>
</table>
<hr>
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<div class="section">
<h3 id="FT_Glyph_Format">FT_Glyph_Format</h3>
<p>Defined in FT_IMAGE_H (ftimage.h).</p>
<pre>
<span class="keyword">typedef</span> <span class="keyword">enum</span> FT_Glyph_Format_
{
<a href="ft2-basic_types.html#FT_IMAGE_TAG">FT_IMAGE_TAG</a>( <a href="ft2-basic_types.html#FT_GLYPH_FORMAT_NONE">FT_GLYPH_FORMAT_NONE</a>, 0, 0, 0, 0 ),
<a href="ft2-basic_types.html#FT_IMAGE_TAG">FT_IMAGE_TAG</a>( <a href="ft2-basic_types.html#FT_GLYPH_FORMAT_COMPOSITE">FT_GLYPH_FORMAT_COMPOSITE</a>, 'c', 'o', 'm', 'p' ),
<a href="ft2-basic_types.html#FT_IMAGE_TAG">FT_IMAGE_TAG</a>( <a href="ft2-basic_types.html#FT_GLYPH_FORMAT_BITMAP">FT_GLYPH_FORMAT_BITMAP</a>, 'b', 'i', 't', 's' ),
<a href="ft2-basic_types.html#FT_IMAGE_TAG">FT_IMAGE_TAG</a>( <a href="ft2-basic_types.html#FT_GLYPH_FORMAT_OUTLINE">FT_GLYPH_FORMAT_OUTLINE</a>, 'o', 'u', 't', 'l' ),
<a href="ft2-basic_types.html#FT_IMAGE_TAG">FT_IMAGE_TAG</a>( <a href="ft2-basic_types.html#FT_GLYPH_FORMAT_PLOTTER">FT_GLYPH_FORMAT_PLOTTER</a>, 'p', 'l', 'o', 't' )
} <b>FT_Glyph_Format</b>;
/* these constants are deprecated; use the corresponding */
/* `<b>FT_Glyph_Format</b>' values instead. */
#define ft_glyph_format_none <a href="ft2-basic_types.html#FT_GLYPH_FORMAT_NONE">FT_GLYPH_FORMAT_NONE</a>
#define ft_glyph_format_composite <a href="ft2-basic_types.html#FT_GLYPH_FORMAT_COMPOSITE">FT_GLYPH_FORMAT_COMPOSITE</a>
#define ft_glyph_format_bitmap <a href="ft2-basic_types.html#FT_GLYPH_FORMAT_BITMAP">FT_GLYPH_FORMAT_BITMAP</a>
#define ft_glyph_format_outline <a href="ft2-basic_types.html#FT_GLYPH_FORMAT_OUTLINE">FT_GLYPH_FORMAT_OUTLINE</a>
#define ft_glyph_format_plotter <a href="ft2-basic_types.html#FT_GLYPH_FORMAT_PLOTTER">FT_GLYPH_FORMAT_PLOTTER</a>
</pre>
<p>An enumeration type used to describe the format of a given glyph image. Note that this version of FreeType only supports two image formats, even though future font drivers will be able to register their own format.</p>
<h4>values</h4>
<table class="fields">
<tr><td class="val" id="FT_GLYPH_FORMAT_NONE">FT_GLYPH_FORMAT_NONE</td><td class="desc">
<p>The value 0 is reserved.</p>
</td></tr>
<tr><td class="val" id="FT_GLYPH_FORMAT_COMPOSITE">FT_GLYPH_FORMAT_COMPOSITE</td><td class="desc">
<p>The glyph image is a composite of several other images. This format is <i>only</i> used with <a href="ft2-base_interface.html#FT_LOAD_XXX">FT_LOAD_NO_RECURSE</a>, and is used to report compound glyphs (like accented characters).</p>
</td></tr>
<tr><td class="val" id="FT_GLYPH_FORMAT_BITMAP">FT_GLYPH_FORMAT_BITMAP</td><td class="desc">
<p>The glyph image is a bitmap, and can be described as an <a href="ft2-basic_types.html#FT_Bitmap">FT_Bitmap</a>. You generally need to access the ‘bitmap’ field of the <a href="ft2-base_interface.html#FT_GlyphSlotRec">FT_GlyphSlotRec</a> structure to read it.</p>
</td></tr>
<tr><td class="val" id="FT_GLYPH_FORMAT_OUTLINE">FT_GLYPH_FORMAT_OUTLINE</td><td class="desc">
<p>The glyph image is a vectorial outline made of line segments and Bézier arcs; it can be described as an <a href="ft2-outline_processing.html#FT_Outline">FT_Outline</a>; you generally want to access the ‘outline’ field of the <a href="ft2-base_interface.html#FT_GlyphSlotRec">FT_GlyphSlotRec</a> structure to read it.</p>
</td></tr>
<tr><td class="val" id="FT_GLYPH_FORMAT_PLOTTER">FT_GLYPH_FORMAT_PLOTTER</td><td class="desc">
<p>The glyph image is a vectorial path with no inside and outside contours. Some Type 1 fonts, like those in the Hershey family, contain glyphs in this format. These are described as <a href="ft2-outline_processing.html#FT_Outline">FT_Outline</a>, but FreeType isn't currently capable of rendering them correctly.</p>
</td></tr>
</table>
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<div class="section">
<h3 id="FT_IMAGE_TAG">FT_IMAGE_TAG</h3>
<p>Defined in FT_IMAGE_H (ftimage.h).</p>
<pre>
#ifndef <b>FT_IMAGE_TAG</b>
#define <b>FT_IMAGE_TAG</b>( value, _x1, _x2, _x3, _x4 ) \
value = ( ( (<span class="keyword">unsigned</span> <span class="keyword">long</span>)_x1 << 24 ) | \
( (<span class="keyword">unsigned</span> <span class="keyword">long</span>)_x2 << 16 ) | \
( (<span class="keyword">unsigned</span> <span class="keyword">long</span>)_x3 << 8 ) | \
(<span class="keyword">unsigned</span> <span class="keyword">long</span>)_x4 )
#endif /* <b>FT_IMAGE_TAG</b> */
</pre>
<p>This macro converts four-letter tags to an unsigned long type.</p>
<h4>note</h4>
<p>Since many 16-bit compilers don't like 32-bit enumerations, you should redefine this macro in case of problems to something like this:</p>
<pre class="colored">
#define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) value
</pre>
<p>to get a simple enumeration without assigning special numbers.</p>
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