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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Uniscribe integration: HarfBuzz Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="HarfBuzz Manual"> <link rel="up" href="integration.html" title="Platform Integration Guide"> <link rel="prev" href="integration-freetype.html" title="FreeType integration"> <link rel="next" href="integration-coretext.html" title="Core Text integration"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="integration.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="integration-freetype.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="integration-coretext.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="integration-uniscribe"></a>Uniscribe integration</h2></div></div></div> <p> If your client program is running on Windows, HarfBuzz offers an additional API that can help integrate with Microsoft's Uniscribe engine and the Windows GDI. </p> <p> Overall, the Uniscribe API covers a broader set of typographic layout functions than HarfBuzz implements, but HarfBuzz's shaping API can serve as a drop-in replacement for Uniscribe's shaping functionality. In fact, one of HarfBuzz's design goals is to accurately reproduce the same output for shaping a given text segment that Uniscribe produces — even to the point of duplicating known shaping bugs or deviations from the specification — so you can be confident that your users' documents with their existing fonts will not be affected adversely by switching to HarfBuzz. </p> <p> At a basic level, HarfBuzz's <code class="function">hb_shape()</code> function replaces both the <a class="ulink" href="" target="_top"><code class="function">ScriptShape()</code></a> and <a class="ulink" href="https://docs.microsoft.com/en-us/windows/desktop/api/Usp10/nf-usp10-scriptplace" target="_top"><code class="function">ScriptPlace()</code></a> functions from Uniscribe. </p> <p> However, whereas <code class="function">ScriptShape()</code> returns the glyphs and clusters for a shaped sequence and <code class="function">ScriptPlace()</code> returns the advances and offsets for those glyphs, <code class="function">hb_shape()</code> handles both. After <code class="function">hb_shape()</code> shapes a buffer, the output glyph IDs and cluster IDs are returned as an array of <span class="structname">hb_glyph_info_t</span> structures, and the glyph advances and offsets are returned as an array of <span class="structname">hb_glyph_position_t</span> structures. </p> <p> Your client program only needs to ensure that it coverts correctly between HarfBuzz's low-level data types (such as <span class="type">hb_position_t</span>) and Windows's corresponding types (such as <span class="type">GOFFSET</span> and <span class="type">ABC</span>). Be sure you read the <a class="xref" href="buffers-language-script-and-direction.html" title="Buffers, language, script and direction"><i>Buffers, language, script and direction</i></a> chapter for a full explanation of how HarfBuzz input buffers are used, and see <a class="xref" href="shaping-and-shape-plans.html#shaping-buffer-output" title="Shaping and buffer output">the section called “Shaping and buffer output”</a> for the details of what <code class="function">hb_shape()</code> returns in the output buffer when shaping is complete. </p> <p> Although <code class="function">hb_shape()</code> itself is functionally equivalent to Uniscribe's shaping routines, there are two additional HarfBuzz functions you may want to use to integrate the libraries in your code. Both are used to link HarfBuzz font objects to the equivalent Windows structures. </p> <p> The <code class="function">hb_uniscribe_font_get_logfontw()</code> function takes a <span class="type">hb_font_t</span> font object and returns a pointer to the <a class="ulink" href="https://docs.microsoft.com/en-us/windows/desktop/api/wingdi/ns-wingdi-logfontw" target="_top"><span class="type">LOGFONTW</span></a> "logical font" that corresponds to it. A <span class="type">LOGFONTW</span> structure holds font-wide attributes, including metrics, size, and style information. </p> <p> The <code class="function">hb_uniscribe_font_get_hfont()</code> function also takes a <span class="type">hb_font_t</span> font object, but it returns an <span class="type">HFONT</span> — a handle to the underlying logical font — instead. </p> <p> <span class="type">LOGFONTW</span>s and <span class="type">HFONT</span>s are both needed by other Uniscribe functions. </p> <p> As a final note, you may notice a reference to an optional <code class="literal">uniscribe</code> shaper back-end in the <a class="xref" href="building.html#configuration" title="Configuration options">the section called “Configuration options”</a> section of the HarfBuzz manual. This option is not a Uniscribe-integration facility. </p> <p> Instead, it is a internal code path used in the <span class="command"><strong>hb-shape</strong></span> command-line utility, which hands shaping functionality over to Uniscribe entirely, when run on a Windows system. That allows testing HarfBuzz's native output against the Uniscribe engine, for tracking compatibility and debugging. </p> <p> Because this back-end is only used when testing HarfBuzz functionality, it is disabled by default when building the HarfBuzz binaries. </p> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>
