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-/***************************************************************************/
-/* */
-/* ftstroke.h */
-/* */
-/* FreeType path stroker (specification). */
-/* */
-/* Copyright 2002, 2003, 2004, 2005, 2006, 2008 by */
-/* David Turner, Robert Wilhelm, and Werner Lemberg. */
-/* */
-/* This file is part of the FreeType project, and may only be used, */
-/* modified, and distributed under the terms of the FreeType project */
-/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
-/* this file you indicate that you have read the license and */
-/* understand and accept it fully. */
-/* */
-/***************************************************************************/
-
-
-#ifndef __FT_STROKE_H__
-#define __FT_STROKE_H__
-
-#include <ft2build.h>
-#include FT_OUTLINE_H
-#include FT_GLYPH_H
-
-
-FT_BEGIN_HEADER
-
-
- /************************************************************************
- *
- * @section:
- * glyph_stroker
- *
- * @title:
- * Glyph Stroker
- *
- * @abstract:
- * Generating bordered and stroked glyphs.
- *
- * @description:
- * This component generates stroked outlines of a given vectorial
- * glyph. It also allows you to retrieve the `outside' and/or the
- * `inside' borders of the stroke.
- *
- * This can be useful to generate `bordered' glyph, i.e., glyphs
- * displayed with a coloured (and anti-aliased) border around their
- * shape.
- */
-
-
- /**************************************************************
- *
- * @type:
- * FT_Stroker
- *
- * @description:
- * Opaque handler to a path stroker object.
- */
- typedef struct FT_StrokerRec_* FT_Stroker;
-
-
- /**************************************************************
- *
- * @enum:
- * FT_Stroker_LineJoin
- *
- * @description:
- * These values determine how two joining lines are rendered
- * in a stroker.
- *
- * @values:
- * FT_STROKER_LINEJOIN_ROUND ::
- * Used to render rounded line joins. Circular arcs are used
- * to join two lines smoothly.
- *
- * FT_STROKER_LINEJOIN_BEVEL ::
- * Used to render beveled line joins; i.e., the two joining lines
- * are extended until they intersect.
- *
- * FT_STROKER_LINEJOIN_MITER ::
- * Same as beveled rendering, except that an additional line
- * break is added if the angle between the two joining lines
- * is too closed (this is useful to avoid unpleasant spikes
- * in beveled rendering).
- */
- typedef enum FT_Stroker_LineJoin_
- {
- FT_STROKER_LINEJOIN_ROUND = 0,
- FT_STROKER_LINEJOIN_BEVEL,
- FT_STROKER_LINEJOIN_MITER
-
- } FT_Stroker_LineJoin;
-
-
- /**************************************************************
- *
- * @enum:
- * FT_Stroker_LineCap
- *
- * @description:
- * These values determine how the end of opened sub-paths are
- * rendered in a stroke.
- *
- * @values:
- * FT_STROKER_LINECAP_BUTT ::
- * The end of lines is rendered as a full stop on the last
- * point itself.
- *
- * FT_STROKER_LINECAP_ROUND ::
- * The end of lines is rendered as a half-circle around the
- * last point.
- *
- * FT_STROKER_LINECAP_SQUARE ::
- * The end of lines is rendered as a square around the
- * last point.
- */
- typedef enum FT_Stroker_LineCap_
- {
- FT_STROKER_LINECAP_BUTT = 0,
- FT_STROKER_LINECAP_ROUND,
- FT_STROKER_LINECAP_SQUARE
-
- } FT_Stroker_LineCap;
-
-
- /**************************************************************
- *
- * @enum:
- * FT_StrokerBorder
- *
- * @description:
- * These values are used to select a given stroke border
- * in @FT_Stroker_GetBorderCounts and @FT_Stroker_ExportBorder.
- *
- * @values:
- * FT_STROKER_BORDER_LEFT ::
- * Select the left border, relative to the drawing direction.
- *
- * FT_STROKER_BORDER_RIGHT ::
- * Select the right border, relative to the drawing direction.
- *
- * @note:
- * Applications are generally interested in the `inside' and `outside'
- * borders. However, there is no direct mapping between these and the
- * `left' and `right' ones, since this really depends on the glyph's
- * drawing orientation, which varies between font formats.
- *
- * You can however use @FT_Outline_GetInsideBorder and
- * @FT_Outline_GetOutsideBorder to get these.
- */
- typedef enum FT_StrokerBorder_
- {
- FT_STROKER_BORDER_LEFT = 0,
- FT_STROKER_BORDER_RIGHT
-
- } FT_StrokerBorder;
-
-
- /**************************************************************
- *
- * @function:
- * FT_Outline_GetInsideBorder
- *
- * @description:
- * Retrieve the @FT_StrokerBorder value corresponding to the
- * `inside' borders of a given outline.
- *
- * @input:
- * outline ::
- * The source outline handle.
- *
- * @return:
- * The border index. @FT_STROKER_BORDER_LEFT for empty or invalid
- * outlines.
- */
- FT_EXPORT( FT_StrokerBorder )
- FT_Outline_GetInsideBorder( FT_Outline* outline );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Outline_GetOutsideBorder
- *
- * @description:
- * Retrieve the @FT_StrokerBorder value corresponding to the
- * `outside' borders of a given outline.
- *
- * @input:
- * outline ::
- * The source outline handle.
- *
- * @return:
- * The border index. @FT_STROKER_BORDER_LEFT for empty or invalid
- * outlines.
- */
- FT_EXPORT( FT_StrokerBorder )
- FT_Outline_GetOutsideBorder( FT_Outline* outline );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_New
- *
- * @description:
- * Create a new stroker object.
- *
- * @input:
- * library ::
- * FreeType library handle.
- *
- * @output:
- * astroker ::
- * A new stroker object handle. NULL in case of error.
- *
- * @return:
- * FreeType error code. 0 means success.
- */
- FT_EXPORT( FT_Error )
- FT_Stroker_New( FT_Library library,
- FT_Stroker *astroker );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_Set
- *
- * @description:
- * Reset a stroker object's attributes.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- *
- * radius ::
- * The border radius.
- *
- * line_cap ::
- * The line cap style.
- *
- * line_join ::
- * The line join style.
- *
- * miter_limit ::
- * The miter limit for the FT_STROKER_LINEJOIN_MITER style,
- * expressed as 16.16 fixed point value.
- *
- * @note:
- * The radius is expressed in the same units that the outline
- * coordinates.
- */
- FT_EXPORT( void )
- FT_Stroker_Set( FT_Stroker stroker,
- FT_Fixed radius,
- FT_Stroker_LineCap line_cap,
- FT_Stroker_LineJoin line_join,
- FT_Fixed miter_limit );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_Rewind
- *
- * @description:
- * Reset a stroker object without changing its attributes.
- * You should call this function before beginning a new
- * series of calls to @FT_Stroker_BeginSubPath or
- * @FT_Stroker_EndSubPath.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- */
- FT_EXPORT( void )
- FT_Stroker_Rewind( FT_Stroker stroker );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_ParseOutline
- *
- * @description:
- * A convenience function used to parse a whole outline with
- * the stroker. The resulting outline(s) can be retrieved
- * later by functions like @FT_Stroker_GetCounts and @FT_Stroker_Export.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- *
- * outline ::
- * The source outline.
- *
- * opened ::
- * A boolean. If 1, the outline is treated as an open path instead
- * of a closed one.
- *
- * @return:
- * FreeType error code. 0 means success.
- *
- * @note:
- * If `opened' is 0 (the default), the outline is treated as a closed
- * path, and the stroker will generate two distinct `border' outlines.
- *
- * If `opened' is 1, the outline is processed as an open path, and the
- * stroker will generate a single `stroke' outline.
- *
- * This function calls @FT_Stroker_Rewind automatically.
- */
- FT_EXPORT( FT_Error )
- FT_Stroker_ParseOutline( FT_Stroker stroker,
- FT_Outline* outline,
- FT_Bool opened );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_BeginSubPath
- *
- * @description:
- * Start a new sub-path in the stroker.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- *
- * to ::
- * A pointer to the start vector.
- *
- * open ::
- * A boolean. If 1, the sub-path is treated as an open one.
- *
- * @return:
- * FreeType error code. 0 means success.
- *
- * @note:
- * This function is useful when you need to stroke a path that is
- * not stored as an @FT_Outline object.
- */
- FT_EXPORT( FT_Error )
- FT_Stroker_BeginSubPath( FT_Stroker stroker,
- FT_Vector* to,
- FT_Bool open );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_EndSubPath
- *
- * @description:
- * Close the current sub-path in the stroker.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- *
- * @return:
- * FreeType error code. 0 means success.
- *
- * @note:
- * You should call this function after @FT_Stroker_BeginSubPath.
- * If the subpath was not `opened', this function will `draw' a
- * single line segment to the start position when needed.
- */
- FT_EXPORT( FT_Error )
- FT_Stroker_EndSubPath( FT_Stroker stroker );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_LineTo
- *
- * @description:
- * `Draw' a single line segment in the stroker's current sub-path,
- * from the last position.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- *
- * to ::
- * A pointer to the destination point.
- *
- * @return:
- * FreeType error code. 0 means success.
- *
- * @note:
- * You should call this function between @FT_Stroker_BeginSubPath and
- * @FT_Stroker_EndSubPath.
- */
- FT_EXPORT( FT_Error )
- FT_Stroker_LineTo( FT_Stroker stroker,
- FT_Vector* to );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_ConicTo
- *
- * @description:
- * `Draw' a single quadratic Bézier in the stroker's current sub-path,
- * from the last position.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- *
- * control ::
- * A pointer to a Bézier control point.
- *
- * to ::
- * A pointer to the destination point.
- *
- * @return:
- * FreeType error code. 0 means success.
- *
- * @note:
- * You should call this function between @FT_Stroker_BeginSubPath and
- * @FT_Stroker_EndSubPath.
- */
- FT_EXPORT( FT_Error )
- FT_Stroker_ConicTo( FT_Stroker stroker,
- FT_Vector* control,
- FT_Vector* to );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_CubicTo
- *
- * @description:
- * `Draw' a single cubic Bézier in the stroker's current sub-path,
- * from the last position.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- *
- * control1 ::
- * A pointer to the first Bézier control point.
- *
- * control2 ::
- * A pointer to second Bézier control point.
- *
- * to ::
- * A pointer to the destination point.
- *
- * @return:
- * FreeType error code. 0 means success.
- *
- * @note:
- * You should call this function between @FT_Stroker_BeginSubPath and
- * @FT_Stroker_EndSubPath.
- */
- FT_EXPORT( FT_Error )
- FT_Stroker_CubicTo( FT_Stroker stroker,
- FT_Vector* control1,
- FT_Vector* control2,
- FT_Vector* to );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_GetBorderCounts
- *
- * @description:
- * Call this function once you have finished parsing your paths
- * with the stroker. It will return the number of points and
- * contours necessary to export one of the `border' or `stroke'
- * outlines generated by the stroker.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- *
- * border ::
- * The border index.
- *
- * @output:
- * anum_points ::
- * The number of points.
- *
- * anum_contours ::
- * The number of contours.
- *
- * @return:
- * FreeType error code. 0 means success.
- *
- * @note:
- * When an outline, or a sub-path, is `closed', the stroker generates
- * two independent `border' outlines, named `left' and `right'.
- *
- * When the outline, or a sub-path, is `opened', the stroker merges
- * the `border' outlines with caps. The `left' border receives all
- * points, while the `right' border becomes empty.
- *
- * Use the function @FT_Stroker_GetCounts instead if you want to
- * retrieve the counts associated to both borders.
- */
- FT_EXPORT( FT_Error )
- FT_Stroker_GetBorderCounts( FT_Stroker stroker,
- FT_StrokerBorder border,
- FT_UInt *anum_points,
- FT_UInt *anum_contours );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_ExportBorder
- *
- * @description:
- * Call this function after @FT_Stroker_GetBorderCounts to
- * export the corresponding border to your own @FT_Outline
- * structure.
- *
- * Note that this function will append the border points and
- * contours to your outline, but will not try to resize its
- * arrays.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- *
- * border ::
- * The border index.
- *
- * outline ::
- * The target outline handle.
- *
- * @note:
- * Always call this function after @FT_Stroker_GetBorderCounts to
- * get sure that there is enough room in your @FT_Outline object to
- * receive all new data.
- *
- * When an outline, or a sub-path, is `closed', the stroker generates
- * two independent `border' outlines, named `left' and `right'
- *
- * When the outline, or a sub-path, is `opened', the stroker merges
- * the `border' outlines with caps. The `left' border receives all
- * points, while the `right' border becomes empty.
- *
- * Use the function @FT_Stroker_Export instead if you want to
- * retrieve all borders at once.
- */
- FT_EXPORT( void )
- FT_Stroker_ExportBorder( FT_Stroker stroker,
- FT_StrokerBorder border,
- FT_Outline* outline );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_GetCounts
- *
- * @description:
- * Call this function once you have finished parsing your paths
- * with the stroker. It returns the number of points and
- * contours necessary to export all points/borders from the stroked
- * outline/path.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- *
- * @output:
- * anum_points ::
- * The number of points.
- *
- * anum_contours ::
- * The number of contours.
- *
- * @return:
- * FreeType error code. 0 means success.
- */
- FT_EXPORT( FT_Error )
- FT_Stroker_GetCounts( FT_Stroker stroker,
- FT_UInt *anum_points,
- FT_UInt *anum_contours );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_Export
- *
- * @description:
- * Call this function after @FT_Stroker_GetBorderCounts to
- * export the all borders to your own @FT_Outline structure.
- *
- * Note that this function will append the border points and
- * contours to your outline, but will not try to resize its
- * arrays.
- *
- * @input:
- * stroker ::
- * The target stroker handle.
- *
- * outline ::
- * The target outline handle.
- */
- FT_EXPORT( void )
- FT_Stroker_Export( FT_Stroker stroker,
- FT_Outline* outline );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Stroker_Done
- *
- * @description:
- * Destroy a stroker object.
- *
- * @input:
- * stroker ::
- * A stroker handle. Can be NULL.
- */
- FT_EXPORT( void )
- FT_Stroker_Done( FT_Stroker stroker );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Glyph_Stroke
- *
- * @description:
- * Stroke a given outline glyph object with a given stroker.
- *
- * @inout:
- * pglyph ::
- * Source glyph handle on input, new glyph handle on output.
- *
- * @input:
- * stroker ::
- * A stroker handle.
- *
- * destroy ::
- * A Boolean. If 1, the source glyph object is destroyed
- * on success.
- *
- * @return:
- * FreeType error code. 0 means success.
- *
- * @note:
- * The source glyph is untouched in case of error.
- */
- FT_EXPORT( FT_Error )
- FT_Glyph_Stroke( FT_Glyph *pglyph,
- FT_Stroker stroker,
- FT_Bool destroy );
-
-
- /**************************************************************
- *
- * @function:
- * FT_Glyph_StrokeBorder
- *
- * @description:
- * Stroke a given outline glyph object with a given stroker, but
- * only return either its inside or outside border.
- *
- * @inout:
- * pglyph ::
- * Source glyph handle on input, new glyph handle on output.
- *
- * @input:
- * stroker ::
- * A stroker handle.
- *
- * inside ::
- * A Boolean. If 1, return the inside border, otherwise
- * the outside border.
- *
- * destroy ::
- * A Boolean. If 1, the source glyph object is destroyed
- * on success.
- *
- * @return:
- * FreeType error code. 0 means success.
- *
- * @note:
- * The source glyph is untouched in case of error.
- */
- FT_EXPORT( FT_Error )
- FT_Glyph_StrokeBorder( FT_Glyph *pglyph,
- FT_Stroker stroker,
- FT_Bool inside,
- FT_Bool destroy );
-
- /* */
-
-FT_END_HEADER
-
-#endif /* __FT_STROKE_H__ */
-
-
-/* END */
-
-
-/* Local Variables: */
-/* coding: utf-8 */
-/* End: */
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