103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
/****************************************************************************
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*
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* ftbbox.h
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*
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* FreeType exact bbox computation (specification).
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*
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* Copyright (C) 1996-2020 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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/**************************************************************************
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*
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* This component has a _single_ role: to compute exact outline bounding
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* boxes.
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*
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* It is separated from the rest of the engine for various technical
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* reasons. It may well be integrated in 'ftoutln' later.
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*
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*/
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#ifndef FTBBOX_H_
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#define FTBBOX_H_
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#ifdef FREETYPE_H
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#error "freetype.h of FreeType 1 has been loaded!"
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#error "Please fix the directory search order for header files"
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#error "so that freetype.h of FreeType 2 is found first."
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#endif
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FT_BEGIN_HEADER
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/**************************************************************************
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*
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* @section:
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* outline_processing
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*
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*/
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/**************************************************************************
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*
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* @function:
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* FT_Outline_Get_BBox
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*
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* @description:
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* Compute the exact bounding box of an outline. This is slower than
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* computing the control box. However, it uses an advanced algorithm
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* that returns _very_ quickly when the two boxes coincide. Otherwise,
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* the outline Bezier arcs are traversed to extract their extrema.
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*
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* @input:
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* outline ::
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* A pointer to the source outline.
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*
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* @output:
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* abbox ::
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* The outline's exact bounding box.
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*
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* @return:
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* FreeType error code. 0~means success.
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*
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* @note:
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* If the font is tricky and the glyph has been loaded with
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* @FT_LOAD_NO_SCALE, the resulting BBox is meaningless. To get
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* reasonable values for the BBox it is necessary to load the glyph at a
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* large ppem value (so that the hinting instructions can properly shift
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* and scale the subglyphs), then extracting the BBox, which can be
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* eventually converted back to font units.
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*/
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FT_EXPORT( FT_Error )
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FT_Outline_Get_BBox( FT_Outline* outline,
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FT_BBox *abbox );
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/* */
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FT_END_HEADER
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#endif /* FTBBOX_H_ */
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/* END */
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/* Local Variables: */
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/* coding: utf-8 */
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/* End: */
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