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autohint.h
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上传日期：2020-08-09
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文件大小：12k
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其他游戏

开发平台：

Visual C++

autohint.h：源码内容
  1. /***************************************************************************/
  2. /*                                                                         */
  3. /*  autohint.h                                                             */
  4. /*                                                                         */
  5. /*    High-level `autohint' module-specific interface (specification).     */
  6. /*                                                                         */
  7. /*  Copyright 1996-2001, 2002, 2007 by                                     */
  8. /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  9. /*                                                                         */
  10. /*  This file is part of the FreeType project, and may only be used,       */
  11. /*  modified, and distributed under the terms of the FreeType project      */
  12. /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  13. /*  this file you indicate that you have read the license and              */
  14. /*  understand and accept it fully.                                        */
  15. /*                                                                         */
  16. /***************************************************************************/
  19.   /*************************************************************************/
  20.   /*                                                                       */
  21.   /* The auto-hinter is used to load and automatically hint glyphs if a    */
  22.   /* format-specific hinter isn't available.                               */
  23.   /*                                                                       */
  24.   /*************************************************************************/
  27. #ifndef __AUTOHINT_H__
  28. #define __AUTOHINT_H__
  31.   /*************************************************************************/
  32.   /*                                                                       */
  33.   /* A small technical note regarding automatic hinting in order to        */
  34.   /* clarify this module interface.                                        */
  35.   /*                                                                       */
  36.   /* An automatic hinter might compute two kinds of data for a given face: */
  37.   /*                                                                       */
  38.   /* - global hints: Usually some metrics that describe global properties  */
  39.   /*                 of the face.  It is computed by scanning more or less */
  40.   /*                 aggressively the glyphs in the face, and thus can be  */
  41.   /*                 very slow to compute (even if the size of global      */
  42.   /*                 hints is really small).                               */
  43.   /*                                                                       */
  44.   /* - glyph hints:  These describe some important features of the glyph   */
  45.   /*                 outline, as well as how to align them.  They are      */
  46.   /*                 generally much faster to compute than global hints.   */
  47.   /*                                                                       */
  48.   /* The current FreeType auto-hinter does a pretty good job while         */
  49.   /* performing fast computations for both global and glyph hints.         */
  50.   /* However, we might be interested in introducing more complex and       */
  51.   /* powerful algorithms in the future, like the one described in the John */
  52.   /* D. Hobby paper, which unfortunately requires a lot more horsepower.   */
  53.   /*                                                                       */
  54.   /* Because a sufficiently sophisticated font management system would     */
  55.   /* typically implement an LRU cache of opened face objects to reduce     */
  56.   /* memory usage, it is a good idea to be able to avoid recomputing       */
  57.   /* global hints every time the same face is re-opened.                   */
  58.   /*                                                                       */
  59.   /* We thus provide the ability to cache global hints outside of the face */
  60.   /* object, in order to speed up font re-opening time.  Of course, this   */
  61.   /* feature is purely optional, so most client programs won't even notice */
  62.   /* it.                                                                   */
  63.   /*                                                                       */
  64.   /* I initially thought that it would be a good idea to cache the glyph   */
  65.   /* hints too.  However, my general idea now is that if you really need   */
  66.   /* to cache these too, you are simply in need of a new font format,      */
  67.   /* where all this information could be stored within the font file and   */
  68.   /* decoded on the fly.                                                   */
  69.   /*                                                                       */
  70.   /*************************************************************************/
  73. #include <ft2build.h>
  74. #include FT_FREETYPE_H
  77. FT_BEGIN_HEADER
  80.   typedef struct FT_AutoHinterRec_  *FT_AutoHinter;
  83.   /*************************************************************************/
  84.   /*                                                                       */
  85.   /* <FuncType>                                                            */
  86.   /*    FT_AutoHinter_GlobalGetFunc                                        */
  87.   /*                                                                       */
  88.   /* <Description>                                                         */
  89.   /*    Retrieves the global hints computed for a given face object the    */
  90.   /*    resulting data is dissociated from the face and will survive a     */
  91.   /*    call to FT_Done_Face().  It must be discarded through the API      */
  92.   /*    FT_AutoHinter_GlobalDoneFunc().                                    */
  93.   /*                                                                       */
  94.   /* <Input>                                                               */
  95.   /*    hinter        :: A handle to the source auto-hinter.               */
  96.   /*                                                                       */
  97.   /*    face          :: A handle to the source face object.               */
  98.   /*                                                                       */
  99.   /* <Output>                                                              */
  100.   /*    global_hints  :: A typeless pointer to the global hints.           */
  101.   /*                                                                       */
  102.   /*    global_len    :: The size in bytes of the global hints.            */
  103.   /*                                                                       */
  104.   typedef void
  105.   (*FT_AutoHinter_GlobalGetFunc)( FT_AutoHinter  hinter,
  106.                                   FT_Face        face,
  107.                                   void**         global_hints,
  108.                                   long*          global_len );
  111.   /*************************************************************************/
  112.   /*                                                                       */
  113.   /* <FuncType>                                                            */
  114.   /*    FT_AutoHinter_GlobalDoneFunc                                       */
  115.   /*                                                                       */
  116.   /* <Description>                                                         */
  117.   /*    Discards the global hints retrieved through                        */
  118.   /*    FT_AutoHinter_GlobalGetFunc().  This is the only way these hints   */
  119.   /*    are freed from memory.                                             */
  120.   /*                                                                       */
  121.   /* <Input>                                                               */
  122.   /*    hinter :: A handle to the auto-hinter module.                      */
  123.   /*                                                                       */
  124.   /*    global :: A pointer to retrieved global hints to discard.          */
  125.   /*                                                                       */
  126.   typedef void
  127.   (*FT_AutoHinter_GlobalDoneFunc)( FT_AutoHinter  hinter,
  128.                                    void*          global );
  131.   /*************************************************************************/
  132.   /*                                                                       */
  133.   /* <FuncType>                                                            */
  134.   /*    FT_AutoHinter_GlobalResetFunc                                      */
  135.   /*                                                                       */
  136.   /* <Description>                                                         */
  137.   /*    This function is used to recompute the global metrics in a given   */
  138.   /*    font.  This is useful when global font data changes (e.g. Multiple */
  139.   /*    Masters fonts where blend coordinates change).                     */
  140.   /*                                                                       */
  141.   /* <Input>                                                               */
  142.   /*    hinter :: A handle to the source auto-hinter.                      */
  143.   /*                                                                       */
  144.   /*    face   :: A handle to the face.                                    */
  145.   /*                                                                       */
  146.   typedef void
  147.   (*FT_AutoHinter_GlobalResetFunc)( FT_AutoHinter  hinter,
  148.                                     FT_Face        face );
  151.   /*************************************************************************/
  152.   /*                                                                       */
  153.   /* <FuncType>                                                            */
  154.   /*    FT_AutoHinter_GlyphLoadFunc                                        */
  155.   /*                                                                       */
  156.   /* <Description>                                                         */
  157.   /*    This function is used to load, scale, and automatically hint a     */
  158.   /*    glyph from a given face.                                           */
  159.   /*                                                                       */
  160.   /* <Input>                                                               */
  161.   /*    face        :: A handle to the face.                               */
  162.   /*                                                                       */
  163.   /*    glyph_index :: The glyph index.                                    */
  164.   /*                                                                       */
  165.   /*    load_flags  :: The load flags.                                     */
  166.   /*                                                                       */
  167.   /* <Note>                                                                */
  168.   /*    This function is capable of loading composite glyphs by hinting    */
  169.   /*    each sub-glyph independently (which improves quality).             */
  170.   /*                                                                       */
  171.   /*    It will call the font driver with FT_Load_Glyph(), with            */
  172.   /*    FT_LOAD_NO_SCALE set.                                              */
  173.   /*                                                                       */
  174.   typedef FT_Error
  175.   (*FT_AutoHinter_GlyphLoadFunc)( FT_AutoHinter  hinter,
  176.                                   FT_GlyphSlot   slot,
  177.                                   FT_Size        size,
  178.                                   FT_UInt        glyph_index,
  179.                                   FT_Int32       load_flags );
  182.   /*************************************************************************/
  183.   /*                                                                       */
  184.   /* <Struct>                                                              */
  185.   /*    FT_AutoHinter_ServiceRec                                           */
  186.   /*                                                                       */
  187.   /* <Description>                                                         */
  188.   /*    The auto-hinter module's interface.                                */
  189.   /*                                                                       */
  190.   typedef struct  FT_AutoHinter_ServiceRec_
  191.   {
  192.     FT_AutoHinter_GlobalResetFunc  reset_face;
  193.     FT_AutoHinter_GlobalGetFunc    get_global_hints;
  194.     FT_AutoHinter_GlobalDoneFunc   done_global_hints;
  195.     FT_AutoHinter_GlyphLoadFunc    load_glyph;
  197.   } FT_AutoHinter_ServiceRec, *FT_AutoHinter_Service;
  200. FT_END_HEADER
  202. #endif /* __AUTOHINT_H__ */
  205. /* END */