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-<title>FreeType-2.5.5 API Reference</title>
+<title>FreeType-2.9.1 API Reference</title>
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-<h1>FreeType-2.5.5 API Reference</h1>
+<h1>FreeType-2.9.1 API Reference</h1>
-<h1>Computations</h1>
+<h1 id="computations">Computations</h1>
<h2>Synopsis</h2>
<table class="synopsis">
<tr><td><a href="#FT_MulDiv">FT_MulDiv</a></td><td> </td><td><a href="#FT_Atan2">FT_Atan2</a></td></tr>
<div class="section">
<h3 id="FT_MulDiv">FT_MulDiv</h3>
-<p>Defined in FT_FREETYPE_H (freetype.h).</p>
+<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<pre>
FT_EXPORT( <a href="ft2-basic_types.html#FT_Long">FT_Long</a> )
<b>FT_MulDiv</b>( <a href="ft2-basic_types.html#FT_Long">FT_Long</a> a,
<a href="ft2-basic_types.html#FT_Long">FT_Long</a> c );
</pre>
-<p>A very simple function used to perform the computation ‘(a*b)/c’ with maximum accuracy (it uses a 64-bit intermediate integer whenever necessary).</p>
+<p>Compute ‘(a*b)/c’ with maximum accuracy, using a 64-bit intermediate integer whenever necessary.</p>
<p>This function isn't necessarily as fast as some processor specific operations, but is at least completely portable.</p>
<h4>input</h4>
<div class="section">
<h3 id="FT_MulFix">FT_MulFix</h3>
-<p>Defined in FT_FREETYPE_H (freetype.h).</p>
+<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<pre>
FT_EXPORT( <a href="ft2-basic_types.html#FT_Long">FT_Long</a> )
<b>FT_MulFix</b>( <a href="ft2-basic_types.html#FT_Long">FT_Long</a> a,
<a href="ft2-basic_types.html#FT_Long">FT_Long</a> b );
</pre>
-<p>A very simple function used to perform the computation ‘(a*b)/0x10000’ with maximum accuracy. Most of the time this is used to multiply a given value by a 16.16 fixed-point factor.</p>
+<p>Compute ‘(a*b)/0x10000’ with maximum accuracy. Its main use is to multiply a given value by a 16.16 fixed-point factor.</p>
<h4>input</h4>
<table class="fields">
<div class="section">
<h3 id="FT_DivFix">FT_DivFix</h3>
-<p>Defined in FT_FREETYPE_H (freetype.h).</p>
+<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<pre>
FT_EXPORT( <a href="ft2-basic_types.html#FT_Long">FT_Long</a> )
<b>FT_DivFix</b>( <a href="ft2-basic_types.html#FT_Long">FT_Long</a> a,
<a href="ft2-basic_types.html#FT_Long">FT_Long</a> b );
</pre>
-<p>A very simple function used to perform the computation ‘(a*0x10000)/b’ with maximum accuracy. Most of the time, this is used to divide a given value by a 16.16 fixed-point factor.</p>
+<p>Compute ‘(a*0x10000)/b’ with maximum accuracy. Its main use is to divide a given value by a 16.16 fixed-point factor.</p>
<h4>input</h4>
<table class="fields">
<div class="section">
<h3 id="FT_RoundFix">FT_RoundFix</h3>
-<p>Defined in FT_FREETYPE_H (freetype.h).</p>
+<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<pre>
FT_EXPORT( <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> )
<b>FT_RoundFix</b>( <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> a );
</pre>
-<p>A very simple function used to round a 16.16 fixed number.</p>
+<p>Round a 16.16 fixed number.</p>
<h4>input</h4>
<table class="fields">
</table>
<h4>return</h4>
-<p>The result of ‘(a + 0x8000) & -0x10000’.</p>
+<p>‘a’ rounded to the nearest 16.16 fixed integer, halfway cases away from zero.</p>
+
+<h4>note</h4>
+<p>The function uses wrap-around arithmetic.</p>
<hr>
<table class="index-toc-link"><tr><td class="left">[<a href="ft2-index.html">Index</a>]</td><td class="middle">[<a href="#">Top</a>]</td><td class="right">[<a href="ft2-toc.html">TOC</a>]</td></tr></table></div>
<div class="section">
<h3 id="FT_CeilFix">FT_CeilFix</h3>
-<p>Defined in FT_FREETYPE_H (freetype.h).</p>
+<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<pre>
FT_EXPORT( <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> )
<b>FT_CeilFix</b>( <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> a );
</pre>
-<p>A very simple function used to compute the ceiling function of a 16.16 fixed number.</p>
+<p>Compute the smallest following integer of a 16.16 fixed number.</p>
<h4>input</h4>
<table class="fields">
</table>
<h4>return</h4>
-<p>The result of ‘(a + 0x10000 - 1) & -0x10000’.</p>
+<p>‘a’ rounded towards plus infinity.</p>
+
+<h4>note</h4>
+<p>The function uses wrap-around arithmetic.</p>
<hr>
<table class="index-toc-link"><tr><td class="left">[<a href="ft2-index.html">Index</a>]</td><td class="middle">[<a href="#">Top</a>]</td><td class="right">[<a href="ft2-toc.html">TOC</a>]</td></tr></table></div>
<div class="section">
<h3 id="FT_FloorFix">FT_FloorFix</h3>
-<p>Defined in FT_FREETYPE_H (freetype.h).</p>
+<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<pre>
FT_EXPORT( <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> )
<b>FT_FloorFix</b>( <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> a );
</pre>
-<p>A very simple function used to compute the floor function of a 16.16 fixed number.</p>
+<p>Compute the largest previous integer of a 16.16 fixed number.</p>
<h4>input</h4>
<table class="fields">
</table>
<h4>return</h4>
-<p>The result of ‘a & -0x10000’.</p>
+<p>‘a’ rounded towards minus infinity.</p>
<hr>
<table class="index-toc-link"><tr><td class="left">[<a href="ft2-index.html">Index</a>]</td><td class="middle">[<a href="#">Top</a>]</td><td class="right">[<a href="ft2-toc.html">TOC</a>]</td></tr></table></div>
<div class="section">
<h3 id="FT_Vector_Transform">FT_Vector_Transform</h3>
-<p>Defined in FT_FREETYPE_H (freetype.h).</p>
+<p>Defined in FT_FREETYPE_H (freetype/freetype.h).</p>
<pre>
FT_EXPORT( <span class="keyword">void</span> )
<b>FT_Vector_Transform</b>( <a href="ft2-basic_types.html#FT_Vector">FT_Vector</a>* vec,
<div class="section">
<h3 id="FT_Matrix_Multiply">FT_Matrix_Multiply</h3>
-<p>Defined in FT_GLYPH_H (ftglyph.h).</p>
+<p>Defined in FT_GLYPH_H (freetype/ftglyph.h).</p>
<pre>
FT_EXPORT( <span class="keyword">void</span> )
<b>FT_Matrix_Multiply</b>( <span class="keyword">const</span> <a href="ft2-basic_types.html#FT_Matrix">FT_Matrix</a>* a,
<h4>note</h4>
<p>The result is undefined if either ‘a’ or ‘b’ is zero.</p>
+<p>Since the function uses wrap-around arithmetic, results become meaningless if the arguments are very large.</p>
<hr>
<table class="index-toc-link"><tr><td class="left">[<a href="ft2-index.html">Index</a>]</td><td class="middle">[<a href="#">Top</a>]</td><td class="right">[<a href="ft2-toc.html">TOC</a>]</td></tr></table></div>
<div class="section">
<h3 id="FT_Matrix_Invert">FT_Matrix_Invert</h3>
-<p>Defined in FT_GLYPH_H (ftglyph.h).</p>
+<p>Defined in FT_GLYPH_H (freetype/ftglyph.h).</p>
<pre>
FT_EXPORT( <a href="ft2-basic_types.html#FT_Error">FT_Error</a> )
<b>FT_Matrix_Invert</b>( <a href="ft2-basic_types.html#FT_Matrix">FT_Matrix</a>* matrix );
<div class="section">
<h3 id="FT_Angle">FT_Angle</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
<span class="keyword">typedef</span> <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> <b>FT_Angle</b>;
</pre>
<div class="section">
<h3 id="FT_ANGLE_PI">FT_ANGLE_PI</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
#define <b>FT_ANGLE_PI</b> ( 180L << 16 )
</pre>
<div class="section">
<h3 id="FT_ANGLE_2PI">FT_ANGLE_2PI</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
#define <b>FT_ANGLE_2PI</b> ( <a href="ft2-computations.html#FT_ANGLE_PI">FT_ANGLE_PI</a> * 2 )
</pre>
<div class="section">
<h3 id="FT_ANGLE_PI2">FT_ANGLE_PI2</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
#define <b>FT_ANGLE_PI2</b> ( <a href="ft2-computations.html#FT_ANGLE_PI">FT_ANGLE_PI</a> / 2 )
</pre>
<div class="section">
<h3 id="FT_ANGLE_PI4">FT_ANGLE_PI4</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
#define <b>FT_ANGLE_PI4</b> ( <a href="ft2-computations.html#FT_ANGLE_PI">FT_ANGLE_PI</a> / 4 )
</pre>
<div class="section">
<h3 id="FT_Sin">FT_Sin</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
FT_EXPORT( <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> )
<b>FT_Sin</b>( <a href="ft2-computations.html#FT_Angle">FT_Angle</a> angle );
<div class="section">
<h3 id="FT_Cos">FT_Cos</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
FT_EXPORT( <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> )
<b>FT_Cos</b>( <a href="ft2-computations.html#FT_Angle">FT_Angle</a> angle );
<div class="section">
<h3 id="FT_Tan">FT_Tan</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
FT_EXPORT( <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> )
<b>FT_Tan</b>( <a href="ft2-computations.html#FT_Angle">FT_Angle</a> angle );
<div class="section">
<h3 id="FT_Atan2">FT_Atan2</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
FT_EXPORT( <a href="ft2-computations.html#FT_Angle">FT_Angle</a> )
<b>FT_Atan2</b>( <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> x,
<div class="section">
<h3 id="FT_Angle_Diff">FT_Angle_Diff</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
FT_EXPORT( <a href="ft2-computations.html#FT_Angle">FT_Angle</a> )
<b>FT_Angle_Diff</b>( <a href="ft2-computations.html#FT_Angle">FT_Angle</a> angle1,
<div class="section">
<h3 id="FT_Vector_Unit">FT_Vector_Unit</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
FT_EXPORT( <span class="keyword">void</span> )
<b>FT_Vector_Unit</b>( <a href="ft2-basic_types.html#FT_Vector">FT_Vector</a>* vec,
<a href="ft2-computations.html#FT_Angle">FT_Angle</a> angle );
</pre>
-<p>Return the unit vector corresponding to a given angle. After the call, the value of ‘vec.x’ will be ‘sin(angle)’, and the value of ‘vec.y’ will be ‘cos(angle)’.</p>
+<p>Return the unit vector corresponding to a given angle. After the call, the value of ‘vec.x’ will be ‘cos(angle)’, and the value of ‘vec.y’ will be ‘sin(angle)’.</p>
<p>This function is useful to retrieve both the sinus and cosinus of a given angle quickly.</p>
<h4>output</h4>
<div class="section">
<h3 id="FT_Vector_Rotate">FT_Vector_Rotate</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
FT_EXPORT( <span class="keyword">void</span> )
<b>FT_Vector_Rotate</b>( <a href="ft2-basic_types.html#FT_Vector">FT_Vector</a>* vec,
<div class="section">
<h3 id="FT_Vector_Length">FT_Vector_Length</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
FT_EXPORT( <a href="ft2-basic_types.html#FT_Fixed">FT_Fixed</a> )
<b>FT_Vector_Length</b>( <a href="ft2-basic_types.html#FT_Vector">FT_Vector</a>* vec );
<div class="section">
<h3 id="FT_Vector_Polarize">FT_Vector_Polarize</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
FT_EXPORT( <span class="keyword">void</span> )
<b>FT_Vector_Polarize</b>( <a href="ft2-basic_types.html#FT_Vector">FT_Vector</a>* vec,
<div class="section">
<h3 id="FT_Vector_From_Polar">FT_Vector_From_Polar</h3>
-<p>Defined in FT_TRIGONOMETRY_H (fttrigon.h).</p>
+<p>Defined in FT_TRIGONOMETRY_H (freetype/fttrigon.h).</p>
<pre>
FT_EXPORT( <span class="keyword">void</span> )
<b>FT_Vector_From_Polar</b>( <a href="ft2-basic_types.html#FT_Vector">FT_Vector</a>* vec,