More formatting.
Synchronizing docu in include/freetype with src/base.
This commit is contained in:
Werner Lemberg
parent
b48a6094b2
commit
97b2de5898
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@ -1977,7 +1977,7 @@
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/* An enumeration used to specify which kerning values to return in */
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/* FT_Get_Kerning(). */
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/* */
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/* <Field> */
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/* <Fields> */
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/* ft_kerning_default :: Return scaled and grid-fitted kerning */
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/* distances (value is 0). */
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/* */
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@ -7,22 +7,28 @@
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/* Copyright 1996-2000 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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/* 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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/* This file contains the definition of several convenience functions */
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/* that can be used by client applications to easily retrieve glyph */
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/* bitmaps and outlines from a given face. */
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/* */
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/* These functions should be optional if you're writing a font server */
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/* or text layout engine on top of FreeType. However, they are pretty */
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/* handy for many other simple uses of the library.. */
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/* */
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/***************************************************************************/
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/*************************************************************************/
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/* */
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/* This file contains the definition of several convenience functions */
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/* that can be used by client applications to easily retrieve glyph */
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/* bitmaps and outlines from a given face. */
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/* */
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/* These functions should be optional if you are writing a font server */
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/* or text layout engine on top of FreeType. However, they are pretty */
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/* handy for many other simple uses of the library. */
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/* */
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/*************************************************************************/
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#ifndef FTGLYPH_H
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#define FTGLYPH_H
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@ -35,24 +41,26 @@
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/* forward declaration to a private type */
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typedef struct FT_Glyph_Class_ FT_Glyph_Class;
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/***********************************************************************
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*
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* <Struct>
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* FT_GlyphRec
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*
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* <Description>
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* The root glyph structure contains a given glyph image plus its
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* advance width in 16.16 fixed float format..
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*
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* <Field>
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* library :: a handle to the FreeType library object.
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* clazz :: a pointer to the glyph's class. Private.
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* format :: the format of the glyph's image
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* advance :: a 16.16 vector that gives the glyph's advance width
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*
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***********************************************************************/
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typedef struct FT_GlyphRec_
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_GlyphRec */
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/* */
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/* <Description> */
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/* The root glyph structure contains a given glyph image plus its */
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/* advance width in 16.16 fixed float format. */
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/* */
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/* <Fields> */
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/* library :: A handle to the FreeType library object. */
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/* */
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/* clazz :: A pointer to the glyph's class. Private. */
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/* */
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/* format :: The format of the glyph's image. */
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/* */
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/* advance :: A 16.16 vector that gives the glyph's advance width. */
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/* */
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typedef struct FT_GlyphRec_
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{
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FT_Library library;
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const FT_Glyph_Class* clazz;
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@ -62,36 +70,37 @@
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} FT_GlyphRec, *FT_Glyph;
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/***********************************************************************
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*
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* <Struct>
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* FT_BitmapGlyphRec
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*
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* <Description>
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* A structure used for bitmap glyph images.. This really is
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* a "sub-class" of "FT_GlyphRec".
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*
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* <Field>
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* root :: the root FT_Glyph fields
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* left :: left-side bearing, i.e. the horizontal distance from
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* the current pen position to the left border of the glyph
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* bitmap.
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* top :: top-side bearing, i.e. the vertical distance from the
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* current pen position to the top border of the glyph bitmap
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* this distance is positive for upwards-y !!
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* bitmap :: a descriptor for the bitmap.
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*
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* <Note>
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* You can typecast a FT_Glyph to FT_BitmapGlyph when you have
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* glyph->format == ft_glyph_format_bitmap. This lets you access
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* the bitmap's content easily..
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*
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* the corresponding pixel buffer is always owned by the BitmapGlyph
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* and is thus created and destroyed with it..
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*
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***********************************************************************/
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typedef struct FT_BitmapGlyphRec_
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_BitmapGlyphRec */
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/* */
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/* <Description> */
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/* A structure used for bitmap glyph images. This really is a */
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/* `sub-class' of `FT_GlyphRec'. */
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/* */
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/* <Fields> */
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/* root :: The root FT_Glyph fields. */
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/* */
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/* left :: The left-side bearing, i.e., the horizontal distance */
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/* from the current pen position to the left border of the */
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/* glyph bitmap. */
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/* */
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/* top :: The top-side bearing, i.e., the vertical distance from */
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/* the current pen position to the top border of the glyph */
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/* bitmap. This distance is positive for upwards-y! */
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/* */
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/* bitmap :: A descriptor for the bitmap. */
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/* */
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/* <Note> */
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/* You can typecast FT_Glyph to FT_BitmapGlyph if you have */
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/* glyph->format == ft_glyph_format_bitmap. This lets you access */
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/* the bitmap's contents easily. */
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/* */
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/* The corresponding pixel buffer is always owned by the BitmapGlyph */
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/* and is thus created and destroyed with it. */
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/* */
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typedef struct FT_BitmapGlyphRec_
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{
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FT_GlyphRec root;
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FT_Int left;
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@ -101,34 +110,33 @@
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} FT_BitmapGlyphRec, *FT_BitmapGlyph;
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/***********************************************************************
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*
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* <Struct>
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* FT_OutlineGlyphRec
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*
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* <Description>
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* A structure used for outline (vectorial) glyph images..
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* This really is a "sub-class" of FT_GlyphRec.
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*
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* <Field>
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* root :: the root FT_Glyph fields.
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* outline :: a descriptor for the outline
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*
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* <Note>
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* You can typecast a FT_Glyph to FT_OutlineGlyph when you have
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* glyph->format == ft_glyph_format_outline. This lets you access
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* the outline's content easily..
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*
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* As the outline is extracted from a glyph slot, its coordinates
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* are expressed normally in 26.6 pixels, unless the flag
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* FT_LOAD_NO_SCALE was used in FT_Load_Glyph / FT_Load_Char..
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*
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* the outline's tables are always owned by the object and are
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* destroyed with it..
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*
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***********************************************************************/
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typedef struct FT_OutlineGlyphRec_
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_OutlineGlyphRec */
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/* */
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/* <Description> */
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/* A structure used for outline (vectorial) glyph images. This */
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/* really is a `sub-class' of `FT_GlyphRec'. */
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/* */
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/* <Fields> */
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/* root :: The root FT_Glyph fields. */
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/* */
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/* outline :: A descriptor for the outline. */
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/* */
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/* <Note> */
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/* You can typecast FT_Glyph to FT_OutlineGlyph if you have */
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/* glyph->format == ft_glyph_format_outline. This lets you access */
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/* the outline's content easily. */
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/* */
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/* As the outline is extracted from a glyph slot, its coordinates are */
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/* expressed normally in 26.6 pixels, unless the flag */
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/* FT_LOAD_NO_SCALE was used in FT_Load_Glyph() or FT_Load_Char(). */
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/* */
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/* The outline's tables are always owned by the object and are */
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/* destroyed with it. */
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/* */
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typedef struct FT_OutlineGlyphRec_
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{
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FT_GlyphRec root;
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FT_Outline outline;
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@ -136,128 +144,78 @@
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} FT_OutlineGlyphRec, *FT_OutlineGlyph;
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/***********************************************************************
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*
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* <Function>
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* FT_Get_Glyph
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*
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* <Description>
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* A function used to extract one glyph image from a slot..
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*
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* <Input>
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* slot :: handle to source glyph slot.
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*
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* <Output>
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* aglyph :: handle to the glyph object.
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*
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* <Return>
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* Error code. 0 means success.
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*
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* <Note>
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*
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*
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***********************************************************************/
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FT_EXPORT_DEF(FT_Error) FT_Get_Glyph( FT_GlyphSlot slot,
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FT_Glyph *aglyph );
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/***********************************************************************
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*
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* <Function>
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* FT_Glyph_Copy
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*
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* <Description>
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* A function used to copy one glyph image.
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*
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* <Input>
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* source :: handle to source glyph object
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*
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* <Output>
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* target :: handle to target glyph object. 0 in case of error
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*
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* <Return>
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* Error code. 0 means success.
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*
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***********************************************************************/
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FT_EXPORT_DEF(FT_Error) FT_Glyph_Copy( FT_Glyph source,
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FT_Glyph *target );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Get_Glyph */
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/* */
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/* <Description> */
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/* A function used to extract a glyph image from a slot. */
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/* */
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/* <Input> */
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/* slot :: A handle to the source glyph slot. */
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/* */
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/* <Output> */
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/* aglyph :: A handle to the glyph object. */
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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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FT_EXPORT_DEF( FT_Error ) FT_Get_Glyph( FT_GlyphSlot slot,
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FT_Glyph* aglyph );
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/***********************************************************************
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*
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* <Function>
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* FT_Glyph_Transform
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*
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* <Description>
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* Transforms a glyph image, when it's format is scalable
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*
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* <Input>
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* glyph :: handle to target glyph object
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*
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* matrix :: pointer to 2x2 matrix to apply
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*
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* delta :: pointer to a 2d vector to apply. coordinates are
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* expressed in 1/64th of a pixel..
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*
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* <Return>
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* error code (is not 0, the glyph format is not scalable).
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*
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* <Note>
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* the 2x2 transform matrix is also applied to the glyph's
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* advance vector
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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_Glyph_Copy */
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/* */
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/* <Description> */
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/* A function used to copy a glyph image. */
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/* */
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/* <Input> */
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/* source :: A handle to the source glyph object. */
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/* */
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/* <Output> */
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/* target :: A handle to the target glyph object. 0 in case of */
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/* error. */
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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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FT_EXPORT_DEF( FT_Error ) FT_Glyph_Copy( FT_Glyph source,
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FT_Glyph* target );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Glyph_Transform */
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/* */
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/* <Description> */
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/* Transforms a glyph image if its format is scalable. */
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/* */
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/* <Input> */
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/* glyph :: A handle to the target glyph object. */
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/* */
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/* matrix :: A pointer to a 2x2 matrix to apply. */
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/* */
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/* delta :: A pointer to a 2d vector to apply. Coordinates are */
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/* expressed in 1/64th of a pixel. */
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/* */
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/* <Return> */
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/* FreeType error code (the glyph format is not scalable if it is */
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/* not zero). */
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/* */
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/* <Note> */
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/* The 2x2 transformation matrix is also applied to the glyph's */
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/* advance vector. */
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/* */
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FT_EXPORT_DEF( FT_Error ) FT_Glyph_Transform( FT_Glyph glyph,
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FT_Matrix* matrix,
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FT_Vector* delta );
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FT_EXPORT_DEF(FT_Error) FT_Glyph_Transform( FT_Glyph glyph,
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FT_Matrix* matrix,
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FT_Vector* delta );
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/***********************************************************************
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*
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* <Function>
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* FT_Glyph_Get_CBox
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*
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* <Description>
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* Returns the glyph image's bounding box.
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*
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* <Input>
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* glyph :: handle to source glyph object
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* mode :: a set of bit flags that indicate how to interpret
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* the meaning of the box's coordinates
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*
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* <Output>
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* box :: the glyph bounding box. Coordinates are expressed in
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* 1/64th of pixels, it is grid-fitted..
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*
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* <Note>
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* Coordinates are relative to the glyph origin, using the Y-upwards
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* convention..
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*
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* if 'ft_glyph_bbox_subpixels' is set in "mode", the bbox coordinates
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* are returned in 26.6 pixels (i.e. 1/64th of pixels).
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*
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* otherwise, coordinates are in integer pixels.
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*
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* note that the maximum coordinates are exclusive, which means that
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* once can compute the width and height of the glyph image (be it
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* in integer or 26.6 pixels) as:
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*
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* width = bbox.xMax - bbox.xMin;
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* height = bbox.yMax - bbox.yMin;
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*
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* Note also that for 26.6 coordinates, if the 'ft_glyph_bbox_gridfit'
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* flag is set in "mode", the coordinates will also be grid-fitted,
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* which corresponds to:
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*
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* bbox.xMin = FLOOR(bbox.xMin);
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* bbox.yMin = FLOOR(bbox.yMin);
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* bbox.xMax = CEILING(bbox.xMax);
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* bbox.yMax = CEILING(bbox.yMax);
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*
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***********************************************************************/
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enum
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{
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ft_glyph_bbox_pixels = 0,
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@ -265,98 +223,150 @@
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ft_glyph_bbox_gridfit = 2
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};
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FT_EXPORT_DEF(void) FT_Glyph_Get_CBox( FT_Glyph glyph,
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FT_UInt bbox_mode,
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FT_BBox *cbox );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Glyph_Get_CBox */
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/* */
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/* <Description> */
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/* Returns the glyph image's bounding box. */
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/* */
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/* <Input> */
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/* glyph :: A handle to the source glyph object. */
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/* */
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/* mode :: A set of bit flags that indicate how to interpret the */
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/* returned bounding box values. */
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/* */
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/* <Output> */
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/* box :: The glyph bounding box. Coordinates are expressed in */
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/* 1/64th of pixels if it is grid-fitted. */
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/* */
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/* <Note> */
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/* Coordinates are relative to the glyph origin, using the Y-upwards */
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/* convention. */
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/* */
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/* If `ft_glyph_bbox_subpixels' is set in `mode', the bbox */
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/* coordinates are returned in 26.6 pixels (i.e. 1/64th of pixels). */
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/* Otherwise, coordinates are expressed in integer pixels. */
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/* */
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/* Note that the maximum coordinates are exclusive, which means that */
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/* one can compute the width and height of the glyph image (be it in */
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/* integer or 26.6 pixels) as: */
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/* */
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/* width = bbox.xMax - bbox.xMin; */
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/* height = bbox.yMax - bbox.yMin; */
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/* */
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/* Note also that for 26.6 coordinates, if the */
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/* `ft_glyph_bbox_gridfit' flag is set in `mode;, the coordinates */
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/* will also be grid-fitted, which corresponds to: */
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/* */
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/* bbox.xMin = FLOOR(bbox.xMin); */
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/* bbox.yMin = FLOOR(bbox.yMin); */
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/* bbox.xMax = CEILING(bbox.xMax); */
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/* bbox.yMax = CEILING(bbox.yMax); */
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/* */
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/* The default value (0) for `bbox_mode' is `ft_glyph_bbox_pixels'. */
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/* */
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FT_EXPORT_DEF( void ) FT_Glyph_Get_CBox( FT_Glyph glyph,
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FT_UInt bbox_mode,
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FT_BBox* cbox );
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/***********************************************************************
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*
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* <Function>
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* FT_Glyph_To_Bitmap
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*
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* <Description>
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* converts a given glyph object to a bitmap glyph object
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*
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* <InOut>
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* glyph :: pointer to a handle to the target glyph
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*
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* <Input>
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* render_mode :: a set of bit flags that describe how
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*
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* origin :: pointer to a vector used to translate the glyph image
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* before rendering. Can be 0 (for no translation). The
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* origin is expressed in 26.6 pixels..
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*
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* destroy :: a boolean that indicates that the original glyph image
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* should be destroyed by this function. The glyph is
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* never destroyed in case of error..
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*
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||||
* <Return>
|
||||
* Error code. 0 means success
|
||||
*
|
||||
* <Note>
|
||||
* the glyph image is translated with the "origin" vector before
|
||||
* rendering.. In case of error, it it translated back to its original
|
||||
* position and the glyph is untouched..
|
||||
*
|
||||
* The first parameter is a pointer to a FT_Glyph handle, that
|
||||
* will be replaced by this function. Typically, you would use:
|
||||
*
|
||||
* {
|
||||
* FT_Glyph glyph;
|
||||
* FT_BitmapGlyph glyph_bitmap;
|
||||
*
|
||||
* // load glyph
|
||||
* error = FT_Load_Char( face, glyph_index, FT_LOAD_DEFAUT );
|
||||
*
|
||||
* // extract glyph image
|
||||
* error = FT_Get_Glyph( face->glyph, &glyph );
|
||||
*
|
||||
* // convert to a bitmap (default render mode + destroy old)
|
||||
* if (glyph->format != ft_glyph_format_bitmap)
|
||||
* {
|
||||
* error = FT_Glyph_To_Bitmap( &glyph, ft_render_mode_default, 0, 1 );
|
||||
* if (error) // glyph unchanged..
|
||||
* }
|
||||
*
|
||||
* // access bitmap content by typecasting
|
||||
* glyph_bitmap = (FT_BitmapGlyph)glyph;
|
||||
*
|
||||
* // do funny stuff with it, like blitting/drawing
|
||||
* ....
|
||||
*
|
||||
* // discard glyph image (bitmap or not)
|
||||
* FT_Done_Glyph( glyph );
|
||||
*
|
||||
*
|
||||
* This function will always fail if the glyph's format isn't scalable
|
||||
*
|
||||
***********************************************************************/
|
||||
|
||||
FT_EXPORT_DEF(FT_Error) FT_Glyph_To_Bitmap( FT_Glyph *the_glyph,
|
||||
FT_ULong render_mode,
|
||||
FT_Vector* origin,
|
||||
FT_Bool destroy );
|
||||
/*************************************************************************/
|
||||
/* */
|
||||
/* <Function> */
|
||||
/* FT_Glyph_To_Bitmap */
|
||||
/* */
|
||||
/* <Description> */
|
||||
/* Converts a given glyph object to a bitmap glyph object. */
|
||||
/* */
|
||||
/* <InOut> */
|
||||
/* glyph :: A pointer to a handle to the target glyph. */
|
||||
/* */
|
||||
/* <Input> */
|
||||
/* render_mode :: A set of bit flags that describe how the data is */
|
||||
/* */
|
||||
/* */
|
||||
/* origin :: A pointer to a vector used to translate the glyph */
|
||||
/* image before rendering. Can be 0 (if no */
|
||||
/* translation). The origin is expressed in */
|
||||
/* 26.6 pixels. */
|
||||
/* */
|
||||
/* destroy :: A boolean that indicates that the original glyph */
|
||||
/* image should be destroyed by this function. It is */
|
||||
/* never destroyed in case of error. */
|
||||
/* */
|
||||
/* <Return> */
|
||||
/* FreeType error code. 0 means success. */
|
||||
/* */
|
||||
/* <Note> */
|
||||
/* The glyph image is translated with the `origin' vector before */
|
||||
/* rendering. In case of error, it it translated back to its */
|
||||
/* original position and the glyph is left untouched. */
|
||||
/* */
|
||||
/* The first parameter is a pointer to a FT_Glyph handle, that will */
|
||||
/* be replaced by this function. Typically, you would use (omitting */
|
||||
/* error handling): */
|
||||
/* */
|
||||
/* */
|
||||
/* { */
|
||||
/* FT_Glyph glyph; */
|
||||
/* FT_BitmapGlyph glyph_bitmap; */
|
||||
/* */
|
||||
/* */
|
||||
/* // load glyph */
|
||||
/* error = FT_Load_Char( face, glyph_index, FT_LOAD_DEFAUT ); */
|
||||
/* */
|
||||
/* // extract glyph image */
|
||||
/* error = FT_Get_Glyph( face->glyph, &glyph ); */
|
||||
/* */
|
||||
/* // convert to a bitmap (default render mode + destroy old) */
|
||||
/* if ( glyph->format != ft_glyph_format_bitmap ) */
|
||||
/* { */
|
||||
/* error = FT_Glyph_To_Bitmap( &glyph, ft_render_mode_default, */
|
||||
/* 0, 1 ); */
|
||||
/* if ( error ) // glyph unchanged */
|
||||
/* ... */
|
||||
/* } */
|
||||
/* */
|
||||
/* // access bitmap content by typecasting */
|
||||
/* glyph_bitmap = (FT_BitmapGlyph)glyph; */
|
||||
/* */
|
||||
/* // do funny stuff with it, like blitting/drawing */
|
||||
/* ... */
|
||||
/* */
|
||||
/* // discard glyph image (bitmap or not) */
|
||||
/* FT_Done_Glyph( glyph ); */
|
||||
/* } */
|
||||
/* */
|
||||
/* */
|
||||
/* This function will always fail if the glyph's format isn't */
|
||||
/* scalable. */
|
||||
/* */
|
||||
FT_EXPORT_DEF( FT_Error ) FT_Glyph_To_Bitmap( FT_Glyph* the_glyph,
|
||||
FT_ULong render_mode,
|
||||
FT_Vector* origin,
|
||||
FT_Bool destroy );
|
||||
|
||||
/***********************************************************************
|
||||
*
|
||||
* <Function>
|
||||
* FT_Done_Glyph
|
||||
*
|
||||
* <Description>
|
||||
* Destroys a given glyph..
|
||||
*
|
||||
* <Input>
|
||||
* glyph :: handle to target glyph object
|
||||
*
|
||||
***********************************************************************/
|
||||
|
||||
FT_EXPORT_DEF(void) FT_Done_Glyph( FT_Glyph glyph );
|
||||
/*************************************************************************/
|
||||
/* */
|
||||
/* <Function> */
|
||||
/* FT_Done_Glyph */
|
||||
/* */
|
||||
/* <Description> */
|
||||
/* Destroys a given glyph. */
|
||||
/* */
|
||||
/* <Input> */
|
||||
/* glyph :: A handle to the target glyph object. */
|
||||
/* */
|
||||
FT_EXPORT_DEF( void ) FT_Done_Glyph( FT_Glyph glyph );
|
||||
|
||||
|
||||
/* other helpful functions */
|
||||
|
||||
|
||||
/*************************************************************************/
|
||||
/* */
|
||||
/* <Function> */
|
||||
|
|
@ -374,8 +384,11 @@
|
|||
/* <MT-Note> */
|
||||
/* Yes. */
|
||||
/* */
|
||||
FT_EXPORT_DEF(void) FT_Matrix_Multiply( FT_Matrix* a,
|
||||
FT_Matrix* b );
|
||||
/* <Note> */
|
||||
/* The result is undefined if either `a' or `b' is zero. */
|
||||
/* */
|
||||
FT_EXPORT_DEF( void ) FT_Matrix_Multiply( FT_Matrix* a,
|
||||
FT_Matrix* b );
|
||||
|
||||
|
||||
/*************************************************************************/
|
||||
|
|
@ -396,7 +409,7 @@
|
|||
/* <MT-Note> */
|
||||
/* Yes. */
|
||||
/* */
|
||||
FT_EXPORT_DEF(FT_Error) FT_Matrix_Invert( FT_Matrix* matrix );
|
||||
FT_EXPORT_DEF( FT_Error ) FT_Matrix_Invert( FT_Matrix* matrix );
|
||||
|
||||
|
||||
#ifdef __cplusplus
|
||||
|
|
@ -404,3 +417,6 @@
|
|||
#endif
|
||||
|
||||
#endif /* FTGLYPH_H */
|
||||
|
||||
|
||||
/* END */
|
||||
|
|
|
|||
|
|
@ -163,7 +163,7 @@
|
|||
* this structure holds pointers to the functions used to load and
|
||||
* free the basic tables that are required in a `sfnt' font file.
|
||||
*
|
||||
* <Field>
|
||||
* <Fields>
|
||||
* unicode_value :: a function used to convert a glyph name into
|
||||
* a Unicode character code
|
||||
*
|
||||
|
|
|
|||
|
|
@ -633,6 +633,8 @@
|
|||
/* bbox.xMax = CEILING(bbox.xMax); */
|
||||
/* bbox.yMax = CEILING(bbox.yMax); */
|
||||
/* */
|
||||
/* The default value (0) for `bbox_mode' is `ft_glyph_bbox_pixels'. */
|
||||
/* */
|
||||
FT_EXPORT_FUNC( void ) FT_Glyph_Get_CBox( FT_Glyph glyph,
|
||||
FT_UInt bbox_mode,
|
||||
FT_BBox* cbox )
|
||||
|
|
|
|||
Loading…
Reference in New Issue