afmodule.c

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Author : Werner Lemberg
Date : 2013-12-21 21:31:38
Hash : 19241347
Message : Introduce `coverages'. Coverages are the interface to the HarfBuzz library to access OpenType features for handling glyphs not addressable by the cmap. Right now, compilation of HarfBuzz is only added to the development build. A solution for standard build mode will be delayed until HarfBuzz gets split into two libraries to avoid mutual dependencies between FreeType and HarfBuzz. Note that this is only a first step in handling coverages, basically providing the framework only. Code for handling selected OpenType features (this is, actually using the data in `afcover.h') will follow. * devel/ftoption.h, include/config/ftoption.h (FT_CONFIG_OPTION_USE_HARFBUZZ): New macro. * src/autofit/hbshim.c, src/autofit/hbshim.h, src/autofit/afcover.h: New files. * src/autofit/afscript.h: Add HarfBuzz script name tags. * src/autofit/afstyles.h: Add default coverage enumeration values. * src/autofit/aftypes.h: Update use of `SCRIPT' and `STYLE' macros. (AF_Coverage): New enumeration (generated by `afcover.h'). (AF_StyleClassRec): New member `coverage'. (AF_DEFINE_STYLE_CLASS): Updated. * include/internal/fttrace.h: Add `afharfbuzz' for tracing coverage data. * src/autofit/afglobal.h: Update use of `SCRIPT' and `STYLE' macros. (AF_SCRIPT_FALLBACK): Renamed to ... (AF_STYLE_FALLBACK): ... this. * src/autofit/afglobal.c: Include `hbshim.c'. Update use of `SCRIPT' and `STYLE' macros. (af_face_globals_compute_style_coverage) [FT_CONFIG_OPTION_USE_HARFBUZZ]: Call `af_get_coverage'. Update. * src/autofit/afmodule.h (AF_ModuleRec): s/fallback_script/fallback_style/. * src/autofit/afmodule.c (af_property_set): Adapt handling of `fallback-script' property to set a fallback style. (af_property_get, af_autofitter_init): Updated. * src/autofit/afpic.c: Update use of `SCRIPT' and `STYLE' macros. * src/autofit/afranges.h: Update use of `SCRIPT' macro. * src/autofit/autofit.c [FT_CONFIG_OPTION_USE_HARFBUZZ]: Include `hbshim.c'. * src/autofit/rules.mk (AUTOF_DRV_SRC): Add `hbshim.c'. (AUTOF_DRV_H): Add `afcover.h'. * builds/freetype.mk (INCLUDE_FLAGS) [DEVEL_DIR]: Use pkg-config for all libraries needed by FreeType.

src/autofit/afmodule.c

/***************************************************************************/
/*                                                                         */
/*  afmodule.c                                                             */
/*                                                                         */
/*    Auto-fitter module implementation (body).                            */
/*                                                                         */
/*  Copyright 2003-2006, 2009, 2011-2013 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.                                        */
/*                                                                         */
/***************************************************************************/


#include "afglobal.h"
#include "afmodule.h"
#include "afloader.h"
#include "aferrors.h"
#include "afpic.h"

#ifdef FT_DEBUG_AUTOFIT
  int    _af_debug_disable_horz_hints;
  int    _af_debug_disable_vert_hints;
  int    _af_debug_disable_blue_hints;
  void*  _af_debug_hints;
#endif

#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_DEBUG_H
#include FT_AUTOHINTER_H
#include FT_SERVICE_PROPERTIES_H


  /*************************************************************************/
  /*                                                                       */
  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  /* messages during execution.                                            */
  /*                                                                       */
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_afmodule


  FT_Error
  af_property_get_face_globals( FT_Face          face,
                                AF_FaceGlobals*  aglobals,
                                AF_Module        module )
  {
    FT_Error        error = FT_Err_Ok;
    AF_FaceGlobals  globals;


    if ( !face )
      return FT_THROW( Invalid_Argument );

    globals = (AF_FaceGlobals)face->autohint.data;
    if ( !globals )
    {
      /* trigger computation of the global style data */
      /* in case it hasn't been done yet              */
      error = af_face_globals_new( face, &globals, module );
      if ( !error )
      {
        face->autohint.data =
          (FT_Pointer)globals;
        face->autohint.finalizer =
          (FT_Generic_Finalizer)af_face_globals_free;
      }
    }

    if ( !error )
      *aglobals = globals;

    return error;
  }


  FT_Error
  af_property_set( FT_Module    ft_module,
                   const char*  property_name,
                   const void*  value )
  {
    FT_Error   error  = FT_Err_Ok;
    AF_Module  module = (AF_Module)ft_module;


    if ( !ft_strcmp( property_name, "fallback-script" ) )
    {
      FT_UInt*  fallback_script = (FT_UInt*)value;

      FT_UInt  ss;


      /* We translate the fallback script to a fallback style that uses */
      /* `fallback-script' as its script and `AF_COVERAGE_NONE' as its  */
      /* coverage value.                                                */
      for ( ss = 0; AF_STYLE_CLASSES_GET[ss]; ss++ )
      {
        AF_StyleClass  style_class = AF_STYLE_CLASSES_GET[ss];


        if ( style_class->script == *fallback_script      &&
             style_class->coverage == AF_COVERAGE_DEFAULT )
        {
          module->fallback_style = ss;
          break;
        }
      }

      if ( !AF_STYLE_CLASSES_GET[ss] )
      {
        FT_TRACE0(( "af_property_set: Invalid value %d for property `%s'\n",
                    fallback_script, property_name ));
        return FT_THROW( Invalid_Argument );
      }

      return error;
    }
    else if ( !ft_strcmp( property_name, "increase-x-height" ) )
    {
      FT_Prop_IncreaseXHeight*  prop = (FT_Prop_IncreaseXHeight*)value;
      AF_FaceGlobals            globals;


      error = af_property_get_face_globals( prop->face, &globals, module );
      if ( !error )
        globals->increase_x_height = prop->limit;

      return error;
    }

    FT_TRACE0(( "af_property_set: missing property `%s'\n",
                property_name ));
    return FT_THROW( Missing_Property );
  }


  FT_Error
  af_property_get( FT_Module    ft_module,
                   const char*  property_name,
                   void*        value )
  {
    FT_Error   error          = FT_Err_Ok;
    AF_Module  module         = (AF_Module)ft_module;
    FT_UInt    fallback_style = module->fallback_style;


    if ( !ft_strcmp( property_name, "glyph-to-script-map" ) )
    {
      FT_Prop_GlyphToScriptMap*  prop = (FT_Prop_GlyphToScriptMap*)value;
      AF_FaceGlobals             globals;


      error = af_property_get_face_globals( prop->face, &globals, module );
      if ( !error )
        prop->map = globals->glyph_styles;

      return error;
    }
    else if ( !ft_strcmp( property_name, "fallback-script" ) )
    {
      FT_UInt*  val = (FT_UInt*)value;

      AF_StyleClass  style_class = AF_STYLE_CLASSES_GET[fallback_style];


      *val = style_class->script;

      return error;
    }
    else if ( !ft_strcmp( property_name, "increase-x-height" ) )
    {
      FT_Prop_IncreaseXHeight*  prop = (FT_Prop_IncreaseXHeight*)value;
      AF_FaceGlobals            globals;


      error = af_property_get_face_globals( prop->face, &globals, module );
      if ( !error )
        prop->limit = globals->increase_x_height;

      return error;
    }


    FT_TRACE0(( "af_property_get: missing property `%s'\n",
                property_name ));
    return FT_THROW( Missing_Property );
  }


  FT_DEFINE_SERVICE_PROPERTIESREC(
    af_service_properties,
    (FT_Properties_SetFunc)af_property_set,
    (FT_Properties_GetFunc)af_property_get )


  FT_DEFINE_SERVICEDESCREC1(
    af_services,
    FT_SERVICE_ID_PROPERTIES, &AF_SERVICE_PROPERTIES_GET )


  FT_CALLBACK_DEF( FT_Module_Interface )
  af_get_interface( FT_Module    module,
                    const char*  module_interface )
  {
    /* AF_SERVICES_GET derefers `library' in PIC mode */
#ifdef FT_CONFIG_OPTION_PIC
    FT_Library  library;


    if ( !module )
      return NULL;
    library = module->library;
    if ( !library )
      return NULL;
#else
    FT_UNUSED( module );
#endif

    return ft_service_list_lookup( AF_SERVICES_GET, module_interface );
  }


  FT_CALLBACK_DEF( FT_Error )
  af_autofitter_init( FT_Module  ft_module )      /* AF_Module */
  {
    AF_Module  module = (AF_Module)ft_module;


    module->fallback_style = AF_STYLE_FALLBACK;

    return af_loader_init( module );
  }


  FT_CALLBACK_DEF( void )
  af_autofitter_done( FT_Module  ft_module )      /* AF_Module */
  {
    AF_Module  module = (AF_Module)ft_module;


    af_loader_done( module );
  }


  FT_CALLBACK_DEF( FT_Error )
  af_autofitter_load_glyph( AF_Module     module,
                            FT_GlyphSlot  slot,
                            FT_Size       size,
                            FT_UInt       glyph_index,
                            FT_Int32      load_flags )
  {
    FT_UNUSED( size );

    return af_loader_load_glyph( module, slot->face,
                                 glyph_index, load_flags );
  }


  FT_DEFINE_AUTOHINTER_INTERFACE(
    af_autofitter_interface,
    NULL,                                                    /* reset_face */
    NULL,                                              /* get_global_hints */
    NULL,                                             /* done_global_hints */
    (FT_AutoHinter_GlyphLoadFunc)af_autofitter_load_glyph )  /* load_glyph */


  FT_DEFINE_MODULE(
    autofit_module_class,

    FT_MODULE_HINTER,
    sizeof ( AF_ModuleRec ),

    "autofitter",
    0x10000L,   /* version 1.0 of the autofitter  */
    0x20000L,   /* requires FreeType 2.0 or above */

    (const void*)&AF_INTERFACE_GET,

    (FT_Module_Constructor)af_autofitter_init,
    (FT_Module_Destructor) af_autofitter_done,
    (FT_Module_Requester)  af_get_interface )


/* END */

kc3-lang/freetype/src/autofit/afmodule.c

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kc3-lang/freetype /src/autofit/afmodule.c