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Bitmap Handling
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Computations
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List Processing
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Bitmap Handling
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Bitmap Handling
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FT_Bitmap_Init
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FT_Bitmap_Copy
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FT_Bitmap_Embolden
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FT_Bitmap_Convert
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FT_Bitmap_Blend
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FT_GlyphSlot_Own_Bitmap
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FT_Bitmap_Done
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Scanline Converter
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Glyph Stroker
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Synopsis
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FT_Bitmap_Init
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FT_Bitmap_Copy
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FT_Bitmap_Embolden
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FT_Bitmap_Convert
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FT_Bitmap_Blend
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FT_GlyphSlot_Own_Bitmap
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FT_Bitmap_Done
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<p><a href="https://www.freetype.org">FreeType</a> » <a href="../">Docs</a> » <a href="index.html#support-api">Support API</a> » Bitmap Handling</p>
<hr />
<h1 id="bitmap-handling">Bitmap Handling<a class="headerlink" href="#bitmap-handling" title="Permanent link">¶</a></h1>
<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</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 ‘flow’ (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">¶</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">¶</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 means success.</p>
<h4>note</h4>
<p><code>source->buffer</code> and <code>target->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">¶</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 means success.</p>
<h4>note</h4>
<p>The current implementation restricts <code>xStrength</code> to be less than or equal to 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">¶</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 ‘pitch’) 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 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->buffer</code> and <code>target->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">¶</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 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->buffer</code> and <code>target->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">¶</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->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 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">¶</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 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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