mirror of
https://github.com/RetroDECK/ES-DE.git
synced 2024-12-04 20:05:38 +00:00
321 lines
9.4 KiB
C
321 lines
9.4 KiB
C
/***************************************************************************/
|
|
/* */
|
|
/* ftstroke.h */
|
|
/* */
|
|
/* FreeType path stroker (specification). */
|
|
/* */
|
|
/* Copyright 2002-2006, 2008, 2009, 2011-2012 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 PLUTOVG_FT_STROKER_H
|
|
#define PLUTOVG_FT_STROKER_H
|
|
|
|
#include "plutovg-ft-raster.h"
|
|
|
|
/**************************************************************
|
|
*
|
|
* @type:
|
|
* PVG_FT_Stroker
|
|
*
|
|
* @description:
|
|
* Opaque handler to a path stroker object.
|
|
*/
|
|
typedef struct PVG_FT_StrokerRec_* PVG_FT_Stroker;
|
|
|
|
|
|
/**************************************************************
|
|
*
|
|
* @enum:
|
|
* PVG_FT_Stroker_LineJoin
|
|
*
|
|
* @description:
|
|
* These values determine how two joining lines are rendered
|
|
* in a stroker.
|
|
*
|
|
* @values:
|
|
* PVG_FT_STROKER_LINEJOIN_ROUND ::
|
|
* Used to render rounded line joins. Circular arcs are used
|
|
* to join two lines smoothly.
|
|
*
|
|
* PVG_FT_STROKER_LINEJOIN_BEVEL ::
|
|
* Used to render beveled line joins. The outer corner of
|
|
* the joined lines is filled by enclosing the triangular
|
|
* region of the corner with a straight line between the
|
|
* outer corners of each stroke.
|
|
*
|
|
* PVG_FT_STROKER_LINEJOIN_MITER_FIXED ::
|
|
* Used to render mitered line joins, with fixed bevels if the
|
|
* miter limit is exceeded. The outer edges of the strokes
|
|
* for the two segments are extended until they meet at an
|
|
* angle. If the segments meet at too sharp an angle (such
|
|
* that the miter would extend from the intersection of the
|
|
* segments a distance greater than the product of the miter
|
|
* limit value and the border radius), then a bevel join (see
|
|
* above) is used instead. This prevents long spikes being
|
|
* created. PVG_FT_STROKER_LINEJOIN_MITER_FIXED generates a miter
|
|
* line join as used in PostScript and PDF.
|
|
*
|
|
* PVG_FT_STROKER_LINEJOIN_MITER_VARIABLE ::
|
|
* PVG_FT_STROKER_LINEJOIN_MITER ::
|
|
* Used to render mitered line joins, with variable bevels if
|
|
* the miter limit is exceeded. The intersection of the
|
|
* strokes is clipped at a line perpendicular to the bisector
|
|
* of the angle between the strokes, at the distance from the
|
|
* intersection of the segments equal to the product of the
|
|
* miter limit value and the border radius. This prevents
|
|
* long spikes being created.
|
|
* PVG_FT_STROKER_LINEJOIN_MITER_VARIABLE generates a mitered line
|
|
* join as used in XPS. PVG_FT_STROKER_LINEJOIN_MITER is an alias
|
|
* for PVG_FT_STROKER_LINEJOIN_MITER_VARIABLE, retained for
|
|
* backwards compatibility.
|
|
*/
|
|
typedef enum PVG_FT_Stroker_LineJoin_
|
|
{
|
|
PVG_FT_STROKER_LINEJOIN_ROUND = 0,
|
|
PVG_FT_STROKER_LINEJOIN_BEVEL = 1,
|
|
PVG_FT_STROKER_LINEJOIN_MITER_VARIABLE = 2,
|
|
PVG_FT_STROKER_LINEJOIN_MITER = PVG_FT_STROKER_LINEJOIN_MITER_VARIABLE,
|
|
PVG_FT_STROKER_LINEJOIN_MITER_FIXED = 3
|
|
|
|
} PVG_FT_Stroker_LineJoin;
|
|
|
|
|
|
/**************************************************************
|
|
*
|
|
* @enum:
|
|
* PVG_FT_Stroker_LineCap
|
|
*
|
|
* @description:
|
|
* These values determine how the end of opened sub-paths are
|
|
* rendered in a stroke.
|
|
*
|
|
* @values:
|
|
* PVG_FT_STROKER_LINECAP_BUTT ::
|
|
* The end of lines is rendered as a full stop on the last
|
|
* point itself.
|
|
*
|
|
* PVG_FT_STROKER_LINECAP_ROUND ::
|
|
* The end of lines is rendered as a half-circle around the
|
|
* last point.
|
|
*
|
|
* PVG_FT_STROKER_LINECAP_SQUARE ::
|
|
* The end of lines is rendered as a square around the
|
|
* last point.
|
|
*/
|
|
typedef enum PVG_FT_Stroker_LineCap_
|
|
{
|
|
PVG_FT_STROKER_LINECAP_BUTT = 0,
|
|
PVG_FT_STROKER_LINECAP_ROUND,
|
|
PVG_FT_STROKER_LINECAP_SQUARE
|
|
|
|
} PVG_FT_Stroker_LineCap;
|
|
|
|
|
|
/**************************************************************
|
|
*
|
|
* @enum:
|
|
* PVG_FT_StrokerBorder
|
|
*
|
|
* @description:
|
|
* These values are used to select a given stroke border
|
|
* in @PVG_FT_Stroker_GetBorderCounts and @PVG_FT_Stroker_ExportBorder.
|
|
*
|
|
* @values:
|
|
* PVG_FT_STROKER_BORDER_LEFT ::
|
|
* Select the left border, relative to the drawing direction.
|
|
*
|
|
* PVG_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 @PVG_FT_Outline_GetInsideBorder and
|
|
* @PVG_FT_Outline_GetOutsideBorder to get these.
|
|
*/
|
|
typedef enum PVG_FT_StrokerBorder_
|
|
{
|
|
PVG_FT_STROKER_BORDER_LEFT = 0,
|
|
PVG_FT_STROKER_BORDER_RIGHT
|
|
|
|
} PVG_FT_StrokerBorder;
|
|
|
|
|
|
/**************************************************************
|
|
*
|
|
* @function:
|
|
* PVG_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.
|
|
*/
|
|
PVG_FT_Error
|
|
PVG_FT_Stroker_New( PVG_FT_Stroker *astroker );
|
|
|
|
|
|
/**************************************************************
|
|
*
|
|
* @function:
|
|
* PVG_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 PVG_FT_STROKER_LINEJOIN_MITER_FIXED and
|
|
* PVG_FT_STROKER_LINEJOIN_MITER_VARIABLE line join styles,
|
|
* expressed as 16.16 fixed-point value.
|
|
*
|
|
* @note:
|
|
* The radius is expressed in the same units as the outline
|
|
* coordinates.
|
|
*/
|
|
void
|
|
PVG_FT_Stroker_Set( PVG_FT_Stroker stroker,
|
|
PVG_FT_Fixed radius,
|
|
PVG_FT_Stroker_LineCap line_cap,
|
|
PVG_FT_Stroker_LineJoin line_join,
|
|
PVG_FT_Fixed miter_limit );
|
|
|
|
/**************************************************************
|
|
*
|
|
* @function:
|
|
* PVG_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 @PVG_FT_Stroker_GetCounts and @PVG_FT_Stroker_Export.
|
|
*
|
|
* @input:
|
|
* stroker ::
|
|
* The target stroker handle.
|
|
*
|
|
* outline ::
|
|
* The source outline.
|
|
*
|
|
*
|
|
* @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 generates two distinct `border' outlines.
|
|
*
|
|
*
|
|
* This function calls @PVG_FT_Stroker_Rewind automatically.
|
|
*/
|
|
PVG_FT_Error
|
|
PVG_FT_Stroker_ParseOutline( PVG_FT_Stroker stroker,
|
|
const PVG_FT_Outline* outline);
|
|
|
|
|
|
/**************************************************************
|
|
*
|
|
* @function:
|
|
* PVG_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.
|
|
*/
|
|
PVG_FT_Error
|
|
PVG_FT_Stroker_GetCounts( PVG_FT_Stroker stroker,
|
|
PVG_FT_UInt *anum_points,
|
|
PVG_FT_UInt *anum_contours );
|
|
|
|
|
|
/**************************************************************
|
|
*
|
|
* @function:
|
|
* PVG_FT_Stroker_Export
|
|
*
|
|
* @description:
|
|
* Call this function after @PVG_FT_Stroker_GetBorderCounts to
|
|
* export all borders to your own @PVG_FT_Outline structure.
|
|
*
|
|
* Note that this function appends the border points and
|
|
* contours to your outline, but does not try to resize its
|
|
* arrays.
|
|
*
|
|
* @input:
|
|
* stroker ::
|
|
* The target stroker handle.
|
|
*
|
|
* outline ::
|
|
* The target outline handle.
|
|
*/
|
|
void
|
|
PVG_FT_Stroker_Export( PVG_FT_Stroker stroker,
|
|
PVG_FT_Outline* outline );
|
|
|
|
|
|
/**************************************************************
|
|
*
|
|
* @function:
|
|
* PVG_FT_Stroker_Done
|
|
*
|
|
* @description:
|
|
* Destroy a stroker object.
|
|
*
|
|
* @input:
|
|
* stroker ::
|
|
* A stroker handle. Can be NULL.
|
|
*/
|
|
void
|
|
PVG_FT_Stroker_Done( PVG_FT_Stroker stroker );
|
|
|
|
|
|
#endif // PLUTOVG_FT_STROKER_H
|