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<!doctype html> <html lang="en" class="no-js"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width,initial-scale=1"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <meta name="description" content="API Reference Documentation for FreeType-2.10.4"> <meta name="author" content="FreeType Contributors"> <meta name="lang:clipboard.copy" content="Copy to clipboard"> <meta name="lang:clipboard.copied" content="Copied to clipboard"> <meta name="lang:search.language" content="en"> <meta name="lang:search.pipeline.stopwords" content="True"> <meta name="lang:search.pipeline.trimmer" content="True"> <meta name="lang:search.result.none" content="No matching documents"> <meta name="lang:search.result.one" content="1 matching document"> <meta name="lang:search.result.other" content="# matching documents"> <meta name="lang:search.tokenizer" content="[\s\-]+"> <link rel="shortcut icon" href="images/favico.ico"> <meta name="generator" content="mkdocs-1.1, 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List Processing </a> </li> <li class="md-nav__item"> <a href="ft2-outline_processing.html" title="Outline Processing" class="md-nav__link"> Outline Processing </a> </li> <li class="md-nav__item"> <a href="ft2-quick_advance.html" title="Quick retrieval of advance values" class="md-nav__link"> Quick retrieval of advance values </a> </li> <li class="md-nav__item md-nav__item--active"> <input class="md-toggle md-nav__toggle" data-md-toggle="toc" type="checkbox" id="__toc"> <label class="md-nav__link md-nav__link--active" for="__toc"> Bitmap Handling </label> <a href="ft2-bitmap_handling.html" title="Bitmap Handling" class="md-nav__link md-nav__link--active"> Bitmap Handling </a> <nav class="md-nav md-nav--secondary"> <label class="md-nav__title" for="__toc">Table of contents</label> <ul class="md-nav__list" 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> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="ft2-raster.html" title="Scanline Converter" class="md-nav__link"> Scanline Converter </a> </li> <li class="md-nav__item"> <a href="ft2-glyph_stroker.html" title="Glyph Stroker" class="md-nav__link"> Glyph Stroker </a> </li> <li class="md-nav__item"> <a href="ft2-system_interface.html" title="System Interface" class="md-nav__link"> System Interface </a> </li> <li class="md-nav__item"> <a href="ft2-module_management.html" title="Module Management" class="md-nav__link"> Module Management </a> </li> <li class="md-nav__item"> <a href="ft2-gzip.html" title="GZIP Streams" class="md-nav__link"> GZIP Streams </a> </li> <li class="md-nav__item"> <a href="ft2-lzw.html" title="LZW Streams" class="md-nav__link"> LZW Streams </a> </li> <li class="md-nav__item"> <a href="ft2-bzip2.html" title="BZIP2 Streams" class="md-nav__link"> BZIP2 Streams </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-toggle md-nav__toggle" data-md-toggle="nav-9" type="checkbox" id="nav-9"> <label class="md-nav__link" for="nav-9"> Error Codes </label> <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> <label class="md-nav__title" for="nav-9"> Error Codes </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="ft2-error_enumerations.html" title="Error Enumerations" class="md-nav__link"> Error Enumerations </a> </li> <li class="md-nav__item"> <a href="ft2-error_code_values.html" title="Error Code Values" class="md-nav__link"> Error Code Values </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-toggle md-nav__toggle" data-md-toggle="nav-10" type="checkbox" id="nav-10"> <label class="md-nav__link" for="nav-10"> Miscellaneous </label> <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> <label class="md-nav__title" for="nav-10"> Miscellaneous </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="ft2-gx_validation.html" title="TrueTypeGX/AAT Validation" class="md-nav__link"> TrueTypeGX/AAT Validation </a> </li> <li class="md-nav__item"> <a href="ft2-incremental.html" title="Incremental Loading" class="md-nav__link"> Incremental Loading </a> </li> <li class="md-nav__item"> <a href="ft2-truetype_engine.html" title="The TrueType Engine" class="md-nav__link"> The TrueType Engine </a> </li> <li class="md-nav__item"> <a href="ft2-ot_validation.html" title="OpenType Validation" class="md-nav__link"> OpenType Validation </a> </li> </ul> </nav> </li> </ul> </nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component="toc"> <div class="md-sidebar__scrollwrap"> <div class="md-sidebar__inner"> <nav class="md-nav md-nav--secondary"> <label class="md-nav__title" for="__toc">Table of contents</label> <ul class="md-nav__list" 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> </li> </ul> </nav> </div> </div> </div> <div class="md-content"> <article class="md-content__inner md-typeset"> <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> </article> </div> </div> </main> <footer class="md-footer"> <div class="md-footer-nav"> <nav class="md-footer-nav__inner md-grid"> <a href="ft2-quick_advance.html" title="Quick retrieval of advance values" class="md-flex md-footer-nav__link md-footer-nav__link--prev" rel="prev"> <div class="md-flex__cell md-flex__cell--shrink"> <i class="md-icon md-icon--arrow-back md-footer-nav__button"></i> </div> <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> <span class="md-flex__ellipsis"> <span class="md-footer-nav__direction"> Previous </span> Quick retrieval of advance values </span> </div> </a> <a href="ft2-raster.html" title="Scanline Converter" class="md-flex md-footer-nav__link md-footer-nav__link--next" rel="next"> <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> <span class="md-flex__ellipsis"> <span class="md-footer-nav__direction"> Next </span> Scanline Converter </span> </div> <div class="md-flex__cell md-flex__cell--shrink"> <i class="md-icon md-icon--arrow-forward md-footer-nav__button"></i> </div> </a> </nav> </div> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class="md-footer-copyright"> <div class="md-footer-copyright__highlight"> Copyright 2020 <a href = "https://www.freetype.org/license.html">The FreeType Project</a>. </div> powered by <a href="https://www.mkdocs.org" target="_blank" rel="noopener">MkDocs</a> and <a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener"> Material for MkDocs</a> </div> </div> </div> </footer> </div> <script src="assets/javascripts/application.c33a9706.js"></script> <script>app.initialize({version:"1.1",url:{base:"."}})</script> <script src="javascripts/extra.js"></script> </body> </html>