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<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>FreeType-2.1.10 API Reference</title><style type="text/css"> body { font-family: Verdana, Geneva, Arial, Helvetica, serif; color: #000000; background: #FFFFFF; } p { text-align: justify; } h1 { text-align: center; } li { text-align: justify; } a:link { color: #0000EF; } a:visited { color: #51188E; } a:hover { color: #FF0000; } span.keyword { font-family: monospace; text-align: left; white-space: pre; color: darkblue; } pre.colored { color: blue; } ul.empty { list-style-type: none; }</style></head><body><center><h1>FreeType-2.1.10 API Reference</h1></center><center><h1>Outline Processing</h1></center><h2>Synopsis</h2><table align=center cellspacing=5 cellpadding=0 border=0><tr><td></td><td><a href="#FT_Outline">FT_Outline</a></td><td></td><td><a href="#FT_Outline_MoveToFunc">FT_Outline_MoveToFunc</a></td></tr><tr><td></td><td><a href="#FT_OUTLINE_FLAGS">FT_OUTLINE_FLAGS</a></td><td></td><td><a href="#FT_Outline_LineToFunc">FT_Outline_LineToFunc</a></td></tr><tr><td></td><td><a href="#FT_Outline_New">FT_Outline_New</a></td><td></td><td><a href="#FT_Outline_ConicToFunc">FT_Outline_ConicToFunc</a></td></tr><tr><td></td><td><a href="#FT_Outline_Done">FT_Outline_Done</a></td><td></td><td><a href="#FT_Outline_CubicToFunc">FT_Outline_CubicToFunc</a></td></tr><tr><td></td><td><a href="#FT_Outline_Copy">FT_Outline_Copy</a></td><td></td><td><a href="#FT_Outline_Funcs">FT_Outline_Funcs</a></td></tr><tr><td></td><td><a href="#FT_Outline_Translate">FT_Outline_Translate</a></td><td></td><td><a href="#FT_Outline_Decompose">FT_Outline_Decompose</a></td></tr><tr><td></td><td><a href="#FT_Outline_Transform">FT_Outline_Transform</a></td><td></td><td><a href="#FT_Outline_Get_CBox">FT_Outline_Get_CBox</a></td></tr><tr><td></td><td><a href="#FT_Outline_Embolden">FT_Outline_Embolden</a></td><td></td><td><a href="#FT_Outline_Get_Bitmap">FT_Outline_Get_Bitmap</a></td></tr><tr><td></td><td><a href="#FT_Outline_Reverse">FT_Outline_Reverse</a></td><td></td><td><a href="#FT_Outline_Render">FT_Outline_Render</a></td></tr><tr><td></td><td><a href="#FT_Outline_Check">FT_Outline_Check</a></td><td></td><td><a href="#FT_Orientation">FT_Orientation</a></td></tr><tr><td></td><td><a href="#FT_Outline_Get_BBox">FT_Outline_Get_BBox</a></td><td></td><td><a href="#FT_Outline_Get_Orientation">FT_Outline_Get_Orientation</a></td></tr><tr><td></td><td><a href="#ft_outline_flags">ft_outline_flags</a></td><td></td><td></td></tr></table><br><br><table align=center width="87%"><tr><td><p>This section contains routines used to create and destroy scalable glyph images known as `outlines'. These can also be measured, transformed, and converted into bitmaps and pixmaps.</p></td></tr></table><br><table align=center width="75%"><tr><td><h4><a name="FT_Outline">FT_Outline</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre> <span class="keyword">typedef</span> <span class="keyword">struct</span> FT_Outline_ { <span class="keyword">short</span> n_contours; /* number of contours in glyph */ <span class="keyword">short</span> n_points; /* number of points in the glyph */ <a href="ft2-basic_types.html#FT_Vector">FT_Vector</a>* points; /* the outline's points */ <span class="keyword">char</span>* tags; /* the points flags */ <span class="keyword">short</span>* contours; /* the contour end points */ <span class="keyword">int</span> flags; /* outline masks */ } <b>FT_Outline</b>;</pre></table><br><table align=center width="87%"><tr><td><p>This structure is used to describe an outline to the scan-line converter.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>fields</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>n_contours</b></td><td><p>The number of contours in the outline.</p></td></tr><tr valign=top><td><b>n_points</b></td><td><p>The number of points in the outline.</p></td></tr><tr valign=top><td><b>points</b></td><td><p>A pointer to an array of `n_points' FT_Vector elements, giving the outline's point coordinates.</p></td></tr><tr valign=top><td><b>tags</b></td><td><p>A pointer to an array of `n_points' chars, giving each outline point's type. If bit 0 is unset, the point is `off' the curve, i.e. a Bezier control point, while it is `on' when set.</p><p>Bit 1 is meaningful for `off' points only. If set, it indicates a third-order Bezier arc control point; and a second-order control point if unset.</p></td></tr><tr valign=top><td><b>contours</b></td><td><p>An array of `n_contours' shorts, giving the end point of each contour within the outline. For example, the first contour is defined by the points `0' to `contours[0]', the second one is defined by the points `contours[0]+1' to `contours[1]', etc.</p></td></tr><tr valign=top><td><b>flags</b></td><td><p>A set of bit flags used to characterize the outline and give hints to the scan-converter and hinter on how to convert/grid-fit it. See FT_Outline_Flags.</p></td></tr></table></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_OUTLINE_FLAGS">FT_OUTLINE_FLAGS</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>#define <a href="ft2-outline_processing.html#FT_OUTLINE_FLAGS">FT_OUTLINE_NONE</a> 0x0#define <a href="ft2-outline_processing.html#FT_OUTLINE_FLAGS">FT_OUTLINE_OWNER</a> 0x1#define <a href="ft2-outline_processing.html#FT_OUTLINE_FLAGS">FT_OUTLINE_EVEN_ODD_FILL</a> 0x2#define <a href="ft2-outline_processing.html#FT_OUTLINE_FLAGS">FT_OUTLINE_REVERSE_FILL</a> 0x4#define <a href="ft2-outline_processing.html#FT_OUTLINE_FLAGS">FT_OUTLINE_IGNORE_DROPOUTS</a> 0x8#define <a href="ft2-outline_processing.html#FT_OUTLINE_FLAGS">FT_OUTLINE_HIGH_PRECISION</a> 0x100#define <a href="ft2-outline_processing.html#FT_OUTLINE_FLAGS">FT_OUTLINE_SINGLE_PASS</a> 0x200</pre></table><br><table align=center width="87%"><tr><td><p>A list of bit-field constants use for the flags in an outline's `flags' field.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>values</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>FT_OUTLINE_NONE</b></td><td><p>Value 0 is reserved.</p></td></tr><tr valign=top><td><b>FT_OUTLINE_OWNER</b></td><td><p>If set, this flag indicates that the outline's field arrays (i.e. `points', `flags' & `contours') are `owned' by the outline object, and should thus be freed when it is destroyed.</p></td></tr><tr valign=top><td><b>FT_OUTLINE_EVEN_ODD_FILL</b></td><td><p>By default, outlines are filled using the non-zero winding rule. If set to 1, the outline will be filled using the even-odd fill rule (only works with the smooth raster).</p></td></tr><tr valign=top><td><b>FT_OUTLINE_REVERSE_FILL</b></td><td><p>By default, outside contours of an outline are oriented in clock-wise direction, as defined in the TrueType specification. This flag is set if the outline uses the opposite direction (typically for Type 1 fonts). This flag is ignored by the scan-converter. However, it is very important for the auto-hinter.</p></td></tr><tr valign=top><td><b>FT_OUTLINE_IGNORE_DROPOUTS</b></td><td><p>By default, the scan converter will try to detect drop-outs in an outline and correct the glyph bitmap to ensure consistent shape continuity. If set, this flag hints the scan-line converter to ignore such cases.</p></td></tr><tr valign=top><td><b>FT_OUTLINE_HIGH_PRECISION</b></td><td><p>This flag indicates that the scan-line converter should try to convert this outline to bitmaps with the highest possible quality. It is typically set for small character sizes. Note that this is only a hint, that might be completely ignored by a given scan-converter.</p></td></tr><tr valign=top><td><b>FT_OUTLINE_SINGLE_PASS</b></td><td><p>This flag is set to force a given scan-converter to only use a single pass over the outline to render a bitmap glyph image. Normally, it is set for very large character sizes. It is only a hint, that might be completely ignored by a given scan-converter.</p></td></tr></table></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Outline_New">FT_Outline_New</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre> FT_EXPORT( <a href="ft2-basic_types.html#FT_Error">FT_Error</a> ) <b>FT_Outline_New</b>( <a href="ft2-base_interface.html#FT_Library">FT_Library</a> library, <a href="ft2-basic_types.html#FT_UInt">FT_UInt</a> numPoints, <a href="ft2-basic_types.html#FT_Int">FT_Int</a> numContours, <a href="ft2-outline_processing.html#FT_Outline">FT_Outline</a> *anoutline ); FT_EXPORT( <a href="ft2-basic_types.html#FT_Error">FT_Error</a> ) FT_Outline_New_Internal( <a href="ft2-system_interface.html#FT_Memory">FT_Memory</a> memory, <a href="ft2-basic_types.html#FT_UInt">FT_UInt</a> numPoints, <a href="ft2-basic_types.html#FT_Int">FT_Int</a> numContours, <a href="ft2-outline_processing.html#FT_Outline">FT_Outline</a> *anoutline );</pre></table><br><table align=center width="87%"><tr><td><p>Creates a new outline of a given size.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>library</b></td><td><p>A handle to the library object from where the outline is allocated. Note however that the new outline will NOT necessarily be FREED, when destroying the library, by FT_Done_FreeType().</p></td></tr><tr valign=top><td><b>numPoints</b></td><td><p>The maximal number of points within the outline.</p></td></tr><tr valign=top><td><b>numContours</b></td><td><p>The maximal number of contours within the outline.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>output</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>anoutline</b></td><td><p>A handle to the new outline. NULL in case of error.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td><p>FreeType error code. 0 means success.</p></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td><p>The reason why this function takes a `library' parameter is simply to use the library's memory allocator.</p></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Outline_Done">FT_Outline_Done</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre> FT_EXPORT( <a href="ft2-basic_types.html#FT_Error">FT_Error</a> ) <b>FT_Outline_Done</b>( <a href="ft2-base_interface.html#FT_Library">FT_Library</a> library, <a href="ft2-outline_processing.html#FT_Outline">FT_Outline</a>* outline ); FT_EXPORT( <a href="ft2-basic_types.html#FT_Error">FT_Error</a> ) FT_Outline_Done_Internal( <a href="ft2-system_interface.html#FT_Memory">FT_Memory</a> memory, <a href="ft2-outline_processing.html#FT_Outline">FT_Outline</a>* outline );</pre></table><br><table align=center width="87%"><tr><td><p>Destroys an outline created with FT_Outline_New().</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>library</b></td><td><p>A handle of the library object used to allocate the outline.</p></td></tr><tr valign=top><td><b>outline</b></td><td><p>A pointer to the outline object to be discarded.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td><p>FreeType error code. 0 means success.</p></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td><p>If the outline's `owner' field is not set, only the outline descriptor will be released.</p><p>The reason why this function takes an `library' parameter is simply to use FT_Free().</p></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Outline_Copy">FT_Outline_Copy</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre> FT_EXPORT( <a href="ft2-basic_types.html#FT_Error">FT_Error</a> ) <b>FT_Outline_Copy</b>( <span class="keyword">const</span> <a href="ft2-outline_processing.html#FT_Outline">FT_Outline</a>* source, <a href="ft2-outline_processing.html#FT_Outline">FT_Outline</a> *target );</pre></table><br><table align=center width="87%"><tr><td><p>Copies an outline into another one. Both objects must have the same sizes (number of points & number of contours) when this function is called.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>source</b></td><td><p>A handle to the source outline.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>output</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>target</b></td><td><p>A handle to the target outline.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>return</b></em></td></tr><tr><td><p>FreeType error code. 0 means success.</p></td></tr></table></td></tr></table><hr width="75%"><table align=center width="75%"><tr><td><h4><a name="FT_Outline_Translate">FT_Outline_Translate</a></h4><table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre> FT_EXPORT( <span class="keyword">void</span> ) <b>FT_Outline_Translate</b>( <span class="keyword">const</span> <a href="ft2-outline_processing.html#FT_Outline">FT_Outline</a>* outline, <a href="ft2-basic_types.html#FT_Pos">FT_Pos</a> xOffset, <a href="ft2-basic_types.html#FT_Pos">FT_Pos</a> yOffset );</pre></table><br><table align=center width="87%"><tr><td><p>Applies a simple translation to the points of an outline.</p></td></tr></table><br><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>inout</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>outline</b></td><td><p>A pointer to the target outline descriptor.</p></td></tr></table></td></tr></table><table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>input</b></em></td></tr><tr><td><table cellpadding=3><tr valign=top><td><b>xOffset</b></td><td><p>The horizontal offset.</p></td></tr>⌨️ 快捷键说明
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