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+ <a href="ft2-computations.html" class="md-nav__link">
+ Computations
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+ List Processing
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+ <a href="ft2-outline_processing.html" class="md-nav__link">
+ Outline Processing
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+ <li class="md-nav__item">
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+ Quick retrieval of advance values
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+ <label class="md-nav__link md-nav__link--active" for="__toc">
+ Bitmap Handling
+ <span class="md-nav__icon md-icon"></span>
+ </label>
+
+ <a href="ft2-bitmap_handling.html" class="md-nav__link md-nav__link--active">
+ Bitmap Handling
+ </a>
+
+
+<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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+ <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
+
+ <li class="md-nav__item">
+ <a href="#synopsis" class="md-nav__link">
+ Synopsis
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_bitmap_init" class="md-nav__link">
+ FT_Bitmap_Init
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_bitmap_copy" class="md-nav__link">
+ FT_Bitmap_Copy
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_bitmap_embolden" class="md-nav__link">
+ FT_Bitmap_Embolden
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_bitmap_convert" class="md-nav__link">
+ FT_Bitmap_Convert
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_bitmap_blend" class="md-nav__link">
+ FT_Bitmap_Blend
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_glyphslot_own_bitmap" class="md-nav__link">
+ FT_GlyphSlot_Own_Bitmap
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_bitmap_done" class="md-nav__link">
+ FT_Bitmap_Done
+ </a>
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+ <a href="#ft_bitmap_init" class="md-nav__link">
+ FT_Bitmap_Init
+ </a>
+
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+ <a href="#ft_bitmap_copy" class="md-nav__link">
+ FT_Bitmap_Copy
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_bitmap_embolden" class="md-nav__link">
+ FT_Bitmap_Embolden
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_bitmap_convert" class="md-nav__link">
+ FT_Bitmap_Convert
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_bitmap_blend" class="md-nav__link">
+ FT_Bitmap_Blend
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_glyphslot_own_bitmap" class="md-nav__link">
+ FT_GlyphSlot_Own_Bitmap
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#ft_bitmap_done" class="md-nav__link">
+ FT_Bitmap_Done
+ </a>
+
+</li>
+
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+
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+ </div>
+
+
+ <div class="md-content" data-md-component="content">
+ <article class="md-content__inner md-typeset">
+
+
+
+ <p><a href="https://www.freetype.org">FreeType</a> &raquo; <a href="../">Docs</a> &raquo; <a href="index.html#support-api">Support API</a> &raquo; Bitmap Handling</p>
+<hr />
+<h1 id="bitmap-handling">Bitmap Handling<a class="headerlink" href="#bitmap-handling" title="Permanent link">&para;</a></h1>
+<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">&para;</a></h2>
+<p>This section contains functions for handling <code><a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a></code> objects, automatically adjusting the target's bitmap buffer size as needed.</p>
+<p>Note that none of the functions changes the bitmap's &lsquo;flow&rsquo; (as indicated by the sign of the <code>pitch</code> field in <code><a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a></code>).</p>
+<p>To set the flow, assign an appropriate positive or negative value to the <code>pitch</code> field of the target <code><a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a></code> object after calling <code><a href="ft2-bitmap_handling.html#ft_bitmap_init">FT_Bitmap_Init</a></code> but before calling any of the other functions described here.</p>
+<h2 id="ft_bitmap_init">FT_Bitmap_Init<a class="headerlink" href="#ft_bitmap_init" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_BITMAP_H (freetype/ftbitmap.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> )
+ <b>FT_Bitmap_Init</b>( <a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a> *abitmap );
+
+
+ /* deprecated */
+ FT_EXPORT( <span class="keyword">void</span> )
+ FT_Bitmap_New( <a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a> *abitmap );
+</code></pre></div>
+
+<p>Initialize a pointer to an <code><a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a></code> structure.</p>
+<h4>inout</h4>
+<table class="fields">
+<tr><td class="val" id="abitmap">abitmap</td><td class="desc">
+<p>A pointer to the bitmap structure.</p>
+</td></tr>
+</table>
+
+<h4>note</h4>
+
+<p>A deprecated name for the same function is <code>FT_Bitmap_New</code>.</p>
+<hr>
+
+<h2 id="ft_bitmap_copy">FT_Bitmap_Copy<a class="headerlink" href="#ft_bitmap_copy" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_BITMAP_H (freetype/ftbitmap.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Bitmap_Copy</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a> *source,
+ <a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a> *target );
+</code></pre></div>
+
+<p>Copy a bitmap into another one.</p>
+<h4>input</h4>
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to a library object.</p>
+</td></tr>
+<tr><td class="val" id="source">source</td><td class="desc">
+<p>A handle to the source bitmap.</p>
+</td></tr>
+</table>
+
+<h4>output</h4>
+<table class="fields">
+<tr><td class="val" id="target">target</td><td class="desc">
+<p>A handle to the target bitmap.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p><code>source-&gt;buffer</code> and <code>target-&gt;buffer</code> must neither be equal nor overlap.</p>
+<hr>
+
+<h2 id="ft_bitmap_embolden">FT_Bitmap_Embolden<a class="headerlink" href="#ft_bitmap_embolden" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_BITMAP_H (freetype/ftbitmap.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Bitmap_Embolden</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a>* bitmap,
+ <a href="ft2-basic_types.html#ft_pos">FT_Pos</a> xStrength,
+ <a href="ft2-basic_types.html#ft_pos">FT_Pos</a> yStrength );
+</code></pre></div>
+
+<p>Embolden a bitmap. The new bitmap will be about <code>xStrength</code> pixels wider and <code>yStrength</code> pixels higher. The left and bottom borders are kept unchanged.</p>
+<h4>input</h4>
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to a library object.</p>
+</td></tr>
+<tr><td class="val" id="xstrength">xStrength</td><td class="desc">
+<p>How strong the glyph is emboldened horizontally. Expressed in 26.6 pixel format.</p>
+</td></tr>
+<tr><td class="val" id="ystrength">yStrength</td><td class="desc">
+<p>How strong the glyph is emboldened vertically. Expressed in 26.6 pixel format.</p>
+</td></tr>
+</table>
+
+<h4>inout</h4>
+<table class="fields">
+<tr><td class="val" id="bitmap">bitmap</td><td class="desc">
+<p>A handle to the target bitmap.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>The current implementation restricts <code>xStrength</code> to be less than or equal to&nbsp;8 if bitmap is of pixel_mode <code><a href="ft2-basic_types.html#ft_pixel_mode">FT_PIXEL_MODE_MONO</a></code>.</p>
+<p>If you want to embolden the bitmap owned by a <code><a href="ft2-base_interface.html#ft_glyphslotrec">FT_GlyphSlotRec</a></code>, you should call <code><a href="ft2-bitmap_handling.html#ft_glyphslot_own_bitmap">FT_GlyphSlot_Own_Bitmap</a></code> on the slot first.</p>
+<p>Bitmaps in <code><a href="ft2-basic_types.html#ft_pixel_mode">FT_PIXEL_MODE_GRAY2</a></code> and <code><a href="ft2-basic_types.html#ft_pixel_mode">FT_PIXEL_MODE_GRAY</a></code>@ format are converted to <code><a href="ft2-basic_types.html#ft_pixel_mode">FT_PIXEL_MODE_GRAY</a></code> format (i.e., 8bpp).</p>
+<hr>
+
+<h2 id="ft_bitmap_convert">FT_Bitmap_Convert<a class="headerlink" href="#ft_bitmap_convert" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_BITMAP_H (freetype/ftbitmap.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Bitmap_Convert</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a> *source,
+ <a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a> *target,
+ <a href="ft2-basic_types.html#ft_int">FT_Int</a> alignment );
+</code></pre></div>
+
+<p>Convert a bitmap object with depth 1bpp, 2bpp, 4bpp, 8bpp or 32bpp to a bitmap object with depth 8bpp, making the number of used bytes per line (a.k.a. the &lsquo;pitch&rsquo;) a multiple of <code>alignment</code>.</p>
+<h4>input</h4>
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to a library object.</p>
+</td></tr>
+<tr><td class="val" id="source">source</td><td class="desc">
+<p>The source bitmap.</p>
+</td></tr>
+<tr><td class="val" id="alignment">alignment</td><td class="desc">
+<p>The pitch of the bitmap is a multiple of this argument. Common values are 1, 2, or 4.</p>
+</td></tr>
+</table>
+
+<h4>output</h4>
+<table class="fields">
+<tr><td class="val" id="target">target</td><td class="desc">
+<p>The target bitmap.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>It is possible to call <code><a href="ft2-bitmap_handling.html#ft_bitmap_convert">FT_Bitmap_Convert</a></code> multiple times without calling <code><a href="ft2-bitmap_handling.html#ft_bitmap_done">FT_Bitmap_Done</a></code> (the memory is simply reallocated).</p>
+<p>Use <code><a href="ft2-bitmap_handling.html#ft_bitmap_done">FT_Bitmap_Done</a></code> to finally remove the bitmap object.</p>
+<p>The <code>library</code> argument is taken to have access to FreeType's memory handling functions.</p>
+<p><code>source-&gt;buffer</code> and <code>target-&gt;buffer</code> must neither be equal nor overlap.</p>
+<hr>
+
+<h2 id="ft_bitmap_blend">FT_Bitmap_Blend<a class="headerlink" href="#ft_bitmap_blend" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_BITMAP_H (freetype/ftbitmap.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Bitmap_Blend</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a>* source,
+ <span class="keyword">const</span> <a href="ft2-basic_types.html#ft_vector">FT_Vector</a> source_offset,
+ <a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a>* target,
+ <a href="ft2-basic_types.html#ft_vector">FT_Vector</a> *atarget_offset,
+ <a href="ft2-color_management.html#ft_color">FT_Color</a> color );
+</code></pre></div>
+
+<p>Blend a bitmap onto another bitmap, using a given color.</p>
+<h4>input</h4>
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to a library object.</p>
+</td></tr>
+<tr><td class="val" id="source">source</td><td class="desc">
+<p>The source bitmap, which can have any <code><a href="ft2-basic_types.html#ft_pixel_mode">FT_Pixel_Mode</a></code> format.</p>
+</td></tr>
+<tr><td class="val" id="source_offset">source_offset</td><td class="desc">
+<p>The offset vector to the upper left corner of the source bitmap in 26.6 pixel format. It should represent an integer offset; the function will set the lowest six bits to zero to enforce that.</p>
+</td></tr>
+<tr><td class="val" id="color">color</td><td class="desc">
+<p>The color used to draw <code>source</code> onto <code>target</code>.</p>
+</td></tr>
+</table>
+
+<h4>inout</h4>
+<table class="fields">
+<tr><td class="val" id="target">target</td><td class="desc">
+<p>A handle to an <code>FT_Bitmap</code> object. It should be either initialized as empty with a call to <code><a href="ft2-bitmap_handling.html#ft_bitmap_init">FT_Bitmap_Init</a></code>, or it should be of type <code><a href="ft2-basic_types.html#ft_pixel_mode">FT_PIXEL_MODE_BGRA</a></code>.</p>
+</td></tr>
+<tr><td class="val" id="atarget_offset">atarget_offset</td><td class="desc">
+<p>The offset vector to the upper left corner of the target bitmap in 26.6 pixel format. It should represent an integer offset; the function will set the lowest six bits to zero to enforce that.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>This function doesn't perform clipping.</p>
+<p>The bitmap in <code>target</code> gets allocated or reallocated as needed; the vector <code>atarget_offset</code> is updated accordingly.</p>
+<p>In case of allocation or reallocation, the bitmap's pitch is set to <code>4 * width</code>. Both <code>source</code> and <code>target</code> must have the same bitmap flow (as indicated by the sign of the <code>pitch</code> field).</p>
+<p><code>source-&gt;buffer</code> and <code>target-&gt;buffer</code> must neither be equal nor overlap.</p>
+<h4>since</h4>
+
+<p>2.10</p>
+<hr>
+
+<h2 id="ft_glyphslot_own_bitmap">FT_GlyphSlot_Own_Bitmap<a class="headerlink" href="#ft_glyphslot_own_bitmap" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_BITMAP_H (freetype/ftbitmap.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_GlyphSlot_Own_Bitmap</b>( <a href="ft2-base_interface.html#ft_glyphslot">FT_GlyphSlot</a> slot );
+</code></pre></div>
+
+<p>Make sure that a glyph slot owns <code>slot-&gt;bitmap</code>.</p>
+<h4>input</h4>
+<table class="fields">
+<tr><td class="val" id="slot">slot</td><td class="desc">
+<p>The glyph slot.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>This function is to be used in combination with <code><a href="ft2-bitmap_handling.html#ft_bitmap_embolden">FT_Bitmap_Embolden</a></code>.</p>
+<hr>
+
+<h2 id="ft_bitmap_done">FT_Bitmap_Done<a class="headerlink" href="#ft_bitmap_done" title="Permanent link">&para;</a></h2>
+<p>Defined in FT_BITMAP_H (freetype/ftbitmap.h).</p>
+<div class = "codehilite"><pre><code> FT_EXPORT( <a href="ft2-basic_types.html#ft_error">FT_Error</a> )
+ <b>FT_Bitmap_Done</b>( <a href="ft2-base_interface.html#ft_library">FT_Library</a> library,
+ <a href="ft2-basic_types.html#ft_bitmap">FT_Bitmap</a> *bitmap );
+</code></pre></div>
+
+<p>Destroy a bitmap object initialized with <code><a href="ft2-bitmap_handling.html#ft_bitmap_init">FT_Bitmap_Init</a></code>.</p>
+<h4>input</h4>
+<table class="fields">
+<tr><td class="val" id="library">library</td><td class="desc">
+<p>A handle to a library object.</p>
+</td></tr>
+<tr><td class="val" id="bitmap">bitmap</td><td class="desc">
+<p>The bitmap object to be freed.</p>
+</td></tr>
+</table>
+
+<h4>return</h4>
+
+<p>FreeType error code. 0&nbsp;means success.</p>
+<h4>note</h4>
+
+<p>The <code>library</code> argument is taken to have access to FreeType's memory handling functions.</p>
+<hr>
+
+
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