/**************************************************************************** * * ttdriver.c * * TrueType font driver implementation (body). * * Copyright (C) 1996-2023 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 <freetype/internal/ftdebug.h> #include <freetype/internal/ftstream.h> #include <freetype/internal/sfnt.h> #include <freetype/internal/services/svfntfmt.h> #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT #include <freetype/ftmm.h> #include <freetype/internal/services/svmm.h> #include <freetype/internal/services/svmetric.h> #endif #include <freetype/internal/services/svtteng.h> #include <freetype/internal/services/svttglyf.h> #include <freetype/internal/services/svprop.h> #include <freetype/ftdriver.h> #include "ttdriver.h" #include "ttgload.h" #include "ttpload.h" #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT #include "ttgxvar.h" #endif #include "tterrors.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 … /* * PROPERTY SERVICE * */ FT_CALLBACK_DEF( FT_Error ) tt_property_set( FT_Module module, /* TT_Driver */ const char* property_name, const void* value, FT_Bool value_is_string ) { … } FT_CALLBACK_DEF( FT_Error ) tt_property_get( FT_Module module, /* TT_Driver */ const char* property_name, void* value ) { … } FT_DEFINE_SERVICE_PROPERTIESREC( tt_service_properties, tt_property_set, /* FT_Properties_SetFunc set_property */ tt_property_get /* FT_Properties_GetFunc get_property */ ) /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /**** ****/ /**** ****/ /**** F A C E S ****/ /**** ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /************************************************************************** * * @Function: * tt_get_kerning * * @Description: * A driver method used to return the kerning vector between two * glyphs of the same face. * * @Input: * face :: * A handle to the source face object. * * left_glyph :: * The index of the left glyph in the kern pair. * * right_glyph :: * The index of the right glyph in the kern pair. * * @Output: * kerning :: * The kerning vector. This is in font units for * scalable formats, and in pixels for fixed-sizes * formats. * * @Return: * FreeType error code. 0 means success. * * @Note: * Only horizontal layouts (left-to-right & right-to-left) are * supported by this function. Other layouts, or more sophisticated * kernings, are out of scope of this method (the basic driver * interface is meant to be simple). * * They can be implemented by format-specific interfaces. */ FT_CALLBACK_DEF( FT_Error ) tt_get_kerning( FT_Face face, /* TT_Face */ FT_UInt left_glyph, FT_UInt right_glyph, FT_Vector* kerning ) { … } FT_CALLBACK_DEF( FT_Error ) tt_get_advances( FT_Face face, /* TT_Face */ FT_UInt start, FT_UInt count, FT_Int32 flags, FT_Fixed *advances ) { … } /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /**** ****/ /**** ****/ /**** S I Z E S ****/ /**** ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS FT_CALLBACK_DEF( FT_Error ) tt_size_select( FT_Size size, FT_ULong strike_index ) { … } #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ FT_CALLBACK_DEF( FT_Error ) tt_size_request( FT_Size size, FT_Size_Request req ) { … } /************************************************************************** * * @Function: * tt_glyph_load * * @Description: * A driver method used to load a glyph within a given glyph slot. * * @Input: * slot :: * A handle to the target slot object where the glyph * will be loaded. * * size :: * A handle to the source face size at which the glyph * must be scaled, loaded, etc. * * glyph_index :: * The index of the glyph in the font file. * * load_flags :: * A flag indicating what to load for this glyph. The * FT_LOAD_XXX constants can be used to control the * glyph loading process (e.g., whether the outline * should be scaled, whether to load bitmaps or not, * whether to hint the outline, etc). * * @Return: * FreeType error code. 0 means success. */ FT_CALLBACK_DEF( FT_Error ) tt_glyph_load( FT_GlyphSlot slot, /* TT_GlyphSlot */ FT_Size size, /* TT_Size */ FT_UInt glyph_index, FT_Int32 load_flags ) { … } /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /**** ****/ /**** ****/ /**** D R I V E R I N T E R F A C E ****/ /**** ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT FT_DEFINE_SERVICE_MULTIMASTERSREC( tt_service_gx_multi_masters, NULL, /* FT_Get_MM_Func get_mm */ NULL, /* FT_Set_MM_Design_Func set_mm_design */ TT_Set_MM_Blend, /* FT_Set_MM_Blend_Func set_mm_blend */ TT_Get_MM_Blend, /* FT_Get_MM_Blend_Func get_mm_blend */ TT_Get_MM_Var, /* FT_Get_MM_Var_Func get_mm_var */ TT_Set_Var_Design, /* FT_Set_Var_Design_Func set_var_design */ TT_Get_Var_Design, /* FT_Get_Var_Design_Func get_var_design */ TT_Set_Named_Instance, /* FT_Set_Named_Instance_Func set_named_instance */ TT_Get_Default_Named_Instance, /* FT_Get_Default_Named_Instance_Func get_default_named_instance */ NULL, /* FT_Set_MM_WeightVector_Func set_mm_weightvector */ NULL, /* FT_Get_MM_WeightVector_Func get_mm_weightvector */ tt_construct_ps_name, /* FT_Construct_PS_Name_Func construct_ps_name */ tt_var_load_delta_set_index_mapping, /* FT_Var_Load_Delta_Set_Idx_Map_Func load_delta_set_idx_map */ tt_var_load_item_variation_store, /* FT_Var_Load_Item_Var_Store_Func load_item_variation_store */ tt_var_get_item_delta, /* FT_Var_Get_Item_Delta_Func get_item_delta */ tt_var_done_item_variation_store, /* FT_Var_Done_Item_Var_Store_Func done_item_variation_store */ tt_var_done_delta_set_index_map, /* FT_Var_Done_Delta_Set_Idx_Map_Func done_delta_set_index_map */ tt_get_var_blend, /* FT_Get_Var_Blend_Func get_var_blend */ tt_done_blend /* FT_Done_Blend_Func done_blend */ ) FT_DEFINE_SERVICE_METRICSVARIATIONSREC( tt_service_metrics_variations, tt_hadvance_adjust, /* FT_HAdvance_Adjust_Func hadvance_adjust */ NULL, /* FT_LSB_Adjust_Func lsb_adjust */ NULL, /* FT_RSB_Adjust_Func rsb_adjust */ tt_vadvance_adjust, /* FT_VAdvance_Adjust_Func vadvance_adjust */ NULL, /* FT_TSB_Adjust_Func tsb_adjust */ NULL, /* FT_BSB_Adjust_Func bsb_adjust */ NULL, /* FT_VOrg_Adjust_Func vorg_adjust */ tt_apply_mvar, /* FT_Metrics_Adjust_Func metrics_adjust */ tt_size_reset_height /* FT_Size_Reset_Func size_reset */ ) #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ static const FT_Service_TrueTypeEngineRec tt_service_truetype_engine = …; FT_DEFINE_SERVICE_TTGLYFREC( tt_service_truetype_glyf, (TT_Glyf_GetLocationFunc)tt_face_get_location /* get_location */ ) #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT FT_DEFINE_SERVICEDESCREC6( tt_services, FT_SERVICE_ID_FONT_FORMAT, FT_FONT_FORMAT_TRUETYPE, FT_SERVICE_ID_MULTI_MASTERS, &tt_service_gx_multi_masters, FT_SERVICE_ID_METRICS_VARIATIONS, &tt_service_metrics_variations, FT_SERVICE_ID_TRUETYPE_ENGINE, &tt_service_truetype_engine, FT_SERVICE_ID_TT_GLYF, &tt_service_truetype_glyf, FT_SERVICE_ID_PROPERTIES, &tt_service_properties ) #else FT_DEFINE_SERVICEDESCREC4( tt_services, FT_SERVICE_ID_FONT_FORMAT, FT_FONT_FORMAT_TRUETYPE, FT_SERVICE_ID_TRUETYPE_ENGINE, &tt_service_truetype_engine, FT_SERVICE_ID_TT_GLYF, &tt_service_truetype_glyf, FT_SERVICE_ID_PROPERTIES, &tt_service_properties ) #endif FT_CALLBACK_DEF( FT_Module_Interface ) tt_get_interface( FT_Module driver, /* TT_Driver */ const char* tt_interface ) { … } /* The FT_DriverInterface structure is defined in ftdriver.h. */ #ifdef TT_USE_BYTECODE_INTERPRETER #define TT_HINTER_FLAG … #else #define TT_HINTER_FLAG … #endif #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS #define TT_SIZE_SELECT … #else #define TT_SIZE_SELECT … #endif FT_DEFINE_DRIVER( tt_driver_class, FT_MODULE_FONT_DRIVER | FT_MODULE_DRIVER_SCALABLE | TT_HINTER_FLAG, sizeof ( TT_DriverRec ), "truetype", /* driver name */ 0x10000L, /* driver version == 1.0 */ 0x20000L, /* driver requires FreeType 2.0 or above */ NULL, /* module-specific interface */ tt_driver_init, /* FT_Module_Constructor module_init */ tt_driver_done, /* FT_Module_Destructor module_done */ tt_get_interface, /* FT_Module_Requester get_interface */ sizeof ( TT_FaceRec ), sizeof ( TT_SizeRec ), sizeof ( FT_GlyphSlotRec ), tt_face_init, /* FT_Face_InitFunc init_face */ tt_face_done, /* FT_Face_DoneFunc done_face */ tt_size_init, /* FT_Size_InitFunc init_size */ tt_size_done, /* FT_Size_DoneFunc done_size */ tt_slot_init, /* FT_Slot_InitFunc init_slot */ NULL, /* FT_Slot_DoneFunc done_slot */ tt_glyph_load, /* FT_Slot_LoadFunc load_glyph */ tt_get_kerning, /* FT_Face_GetKerningFunc get_kerning */ NULL, /* FT_Face_AttachFunc attach_file */ tt_get_advances, /* FT_Face_GetAdvancesFunc get_advances */ tt_size_request, /* FT_Size_RequestFunc request_size */ TT_SIZE_SELECT /* FT_Size_SelectFunc select_size */ ) /* END */
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