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Edit File : ftbbox.h \| Size : 5.11 KB
/**************************************************************************/ / / / ftbbox.h / / / / FreeType exact bbox computation (specification). / / / / Copyright 1996-2018 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. / / / /************************************************************************/ /**********************************************************************/ / / / This component has a _single_ role: to compute exact outline bounding / / boxes. / / / / It is separated from the rest of the engine for various technical / / reasons. It may well be integrated in `ftoutln' later. / / / /**********************************************************************/ #ifndef FTBBOX_H_ #define FTBBOX_H_ #include <ft2build.h> #include FT_FREETYPE_H #ifdef FREETYPE_H #error "freetype.h of FreeType 1 has been loaded!" #error "Please fix the directory search order for header files" #error "so that freetype.h of FreeType 2 is found first." #endif FT_BEGIN_HEADER /**********************************************************************/ / / / <Section> / / outline_processing / / / /**********************************************************************/ /**********************************************************************/ / / / <Function> / / FT_Outline_Get_BBox / / / / <Description> / / Compute the exact bounding box of an outline. This is slower / / than computing the control box. However, it uses an advanced / / algorithm that returns _very_ quickly when the two boxes / / coincide. Otherwise, the outline Bezier arcs are traversed to / / extract their extrema. / / / / <Input> / / outline :: A pointer to the source outline. / / / / <Output> / / abbox :: The outline's exact bounding box. / / / / <Return> / / FreeType error code. 0~means success. / / / / <Note> / / If the font is tricky and the glyph has been loaded with / / @FT_LOAD_NO_SCALE, the resulting BBox is meaningless. To get / / reasonable values for the BBox it is necessary to load the glyph / / at a large ppem value (so that the hinting instructions can / / properly shift and scale the subglyphs), then extracting the BBox, / / which can be eventually converted back to font units. / / / FT_EXPORT( FT_Error ) FT_Outline_Get_BBox( FT_Outline outline, FT_BBox abbox ); / / FT_END_HEADER #endif / FTBBOX_H_ / / END / / Local Variables: / / coding: utf-8 / / End: */ Back

Edit File : ftbbox.h | Size : 5.11 KB

/***************************************************************************/
/*                                                                         */
/*  ftbbox.h                                                               */
/*                                                                         */
/*    FreeType exact bbox computation (specification).                     */
/*                                                                         */
/*  Copyright 1996-2018 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.                                        */
/*                                                                         */
/***************************************************************************/

/*************************************************************************/
  /*                                                                       */
  /* This component has a _single_ role: to compute exact outline bounding */
  /* boxes.                                                                */
  /*                                                                       */
  /* It is separated from the rest of the engine for various technical     */
  /* reasons.  It may well be integrated in `ftoutln' later.               */
  /*                                                                       */
  /*************************************************************************/

#ifndef FTBBOX_H_
#define FTBBOX_H_

#include <ft2build.h>
#include FT_FREETYPE_H

#ifdef FREETYPE_H
#error "freetype.h of FreeType 1 has been loaded!"
#error "Please fix the directory search order for header files"
#error "so that freetype.h of FreeType 2 is found first."
#endif

FT_BEGIN_HEADER

/*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*    outline_processing                                                 */
  /*                                                                       */
  /*************************************************************************/

/*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Outline_Get_BBox                                                */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Compute the exact bounding box of an outline.  This is slower      */
  /*    than computing the control box.  However, it uses an advanced      */
  /*    algorithm that returns _very_ quickly when the two boxes           */
  /*    coincide.  Otherwise, the outline Bezier arcs are traversed to     */
  /*    extract their extrema.                                             */
  /*                                                                       */
  /* <Input>                                                               */
  /*    outline :: A pointer to the source outline.                        */
  /*                                                                       */
  /* <Output>                                                              */
  /*    abbox   :: The outline's exact bounding box.                       */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0~means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    If the font is tricky and the glyph has been loaded with           */
  /*    @FT_LOAD_NO_SCALE, the resulting BBox is meaningless.  To get      */
  /*    reasonable values for the BBox it is necessary to load the glyph   */
  /*    at a large ppem value (so that the hinting instructions can        */
  /*    properly shift and scale the subglyphs), then extracting the BBox, */
  /*    which can be eventually converted back to font units.              */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_Outline_Get_BBox( FT_Outline*  outline,
                       FT_BBox     *abbox );

/* */

FT_END_HEADER

#endif /* FTBBOX_H_ */

/* END */

/* Local Variables: */
/* coding: utf-8    */
/* End:             */

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