| /**************************************************************************** |
| * |
| * ttdriver.c |
| * |
| * TrueType font driver implementation (body). |
| * |
| * Copyright (C) 1996-2021 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 ttdriver |
| |
| |
| /* |
| * PROPERTY SERVICE |
| * |
| */ |
| static FT_Error |
| tt_property_set( FT_Module module, /* TT_Driver */ |
| const char* property_name, |
| const void* value, |
| FT_Bool value_is_string ) |
| { |
| FT_Error error = FT_Err_Ok; |
| TT_Driver driver = (TT_Driver)module; |
| |
| #ifndef FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES |
| FT_UNUSED( value_is_string ); |
| #endif |
| |
| |
| if ( !ft_strcmp( property_name, "interpreter-version" ) ) |
| { |
| FT_UInt interpreter_version; |
| |
| |
| #ifdef FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES |
| if ( value_is_string ) |
| { |
| const char* s = (const char*)value; |
| |
| |
| interpreter_version = (FT_UInt)ft_strtol( s, NULL, 10 ); |
| } |
| else |
| #endif |
| { |
| FT_UInt* iv = (FT_UInt*)value; |
| |
| |
| interpreter_version = *iv; |
| } |
| |
| if ( interpreter_version == TT_INTERPRETER_VERSION_35 |
| #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY |
| || interpreter_version == TT_INTERPRETER_VERSION_38 |
| #endif |
| #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL |
| || interpreter_version == TT_INTERPRETER_VERSION_40 |
| #endif |
| ) |
| driver->interpreter_version = interpreter_version; |
| else |
| error = FT_ERR( Unimplemented_Feature ); |
| |
| return error; |
| } |
| |
| FT_TRACE2(( "tt_property_set: missing property `%s'\n", |
| property_name )); |
| return FT_THROW( Missing_Property ); |
| } |
| |
| |
| static FT_Error |
| tt_property_get( FT_Module module, /* TT_Driver */ |
| const char* property_name, |
| const void* value ) |
| { |
| FT_Error error = FT_Err_Ok; |
| TT_Driver driver = (TT_Driver)module; |
| |
| FT_UInt interpreter_version = driver->interpreter_version; |
| |
| |
| if ( !ft_strcmp( property_name, "interpreter-version" ) ) |
| { |
| FT_UInt* val = (FT_UInt*)value; |
| |
| |
| *val = interpreter_version; |
| |
| return error; |
| } |
| |
| FT_TRACE2(( "tt_property_get: missing property `%s'\n", |
| property_name )); |
| return FT_THROW( Missing_Property ); |
| } |
| |
| |
| FT_DEFINE_SERVICE_PROPERTIESREC( |
| tt_service_properties, |
| |
| (FT_Properties_SetFunc)tt_property_set, /* set_property */ |
| (FT_Properties_GetFunc)tt_property_get /* 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. |
| */ |
| static FT_Error |
| tt_get_kerning( FT_Face ttface, /* TT_Face */ |
| FT_UInt left_glyph, |
| FT_UInt right_glyph, |
| FT_Vector* kerning ) |
| { |
| TT_Face face = (TT_Face)ttface; |
| SFNT_Service sfnt = (SFNT_Service)face->sfnt; |
| |
| |
| kerning->x = 0; |
| kerning->y = 0; |
| |
| if ( sfnt ) |
| kerning->x = sfnt->get_kerning( face, left_glyph, right_glyph ); |
| |
| return 0; |
| } |
| |
| |
| static FT_Error |
| tt_get_advances( FT_Face ttface, |
| FT_UInt start, |
| FT_UInt count, |
| FT_Int32 flags, |
| FT_Fixed *advances ) |
| { |
| FT_UInt nn; |
| TT_Face face = (TT_Face)ttface; |
| |
| |
| /* XXX: TODO: check for sbits */ |
| |
| if ( flags & FT_LOAD_VERTICAL_LAYOUT ) |
| { |
| #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT |
| /* no fast retrieval for blended MM fonts without VVAR table */ |
| if ( ( FT_IS_NAMED_INSTANCE( ttface ) || FT_IS_VARIATION( ttface ) ) && |
| !( face->variation_support & TT_FACE_FLAG_VAR_VADVANCE ) ) |
| return FT_THROW( Unimplemented_Feature ); |
| #endif |
| |
| for ( nn = 0; nn < count; nn++ ) |
| { |
| FT_Short tsb; |
| FT_UShort ah; |
| |
| |
| /* since we don't need `tsb', we use zero for `yMax' parameter */ |
| TT_Get_VMetrics( face, start + nn, 0, &tsb, &ah ); |
| advances[nn] = ah; |
| } |
| } |
| else |
| { |
| #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT |
| /* no fast retrieval for blended MM fonts without HVAR table */ |
| if ( ( FT_IS_NAMED_INSTANCE( ttface ) || FT_IS_VARIATION( ttface ) ) && |
| !( face->variation_support & TT_FACE_FLAG_VAR_HADVANCE ) ) |
| return FT_THROW( Unimplemented_Feature ); |
| #endif |
| |
| for ( nn = 0; nn < count; nn++ ) |
| { |
| FT_Short lsb; |
| FT_UShort aw; |
| |
| |
| TT_Get_HMetrics( face, start + nn, &lsb, &aw ); |
| advances[nn] = aw; |
| } |
| } |
| |
| return FT_Err_Ok; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /**** ****/ |
| /**** ****/ |
| /**** S I Z E S ****/ |
| /**** ****/ |
| /**** ****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| |
| #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS |
| |
| static FT_Error |
| tt_size_select( FT_Size size, |
| FT_ULong strike_index ) |
| { |
| TT_Face ttface = (TT_Face)size->face; |
| TT_Size ttsize = (TT_Size)size; |
| FT_Error error = FT_Err_Ok; |
| |
| |
| ttsize->strike_index = strike_index; |
| |
| if ( FT_IS_SCALABLE( size->face ) ) |
| { |
| /* use the scaled metrics, even when tt_size_reset fails */ |
| FT_Select_Metrics( size->face, strike_index ); |
| |
| tt_size_reset( ttsize, 0 ); /* ignore return value */ |
| } |
| else |
| { |
| SFNT_Service sfnt = (SFNT_Service)ttface->sfnt; |
| FT_Size_Metrics* size_metrics = &size->metrics; |
| |
| |
| error = sfnt->load_strike_metrics( ttface, |
| strike_index, |
| size_metrics ); |
| if ( error ) |
| ttsize->strike_index = 0xFFFFFFFFUL; |
| } |
| |
| return error; |
| } |
| |
| #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ |
| |
| |
| static FT_Error |
| tt_size_request( FT_Size size, |
| FT_Size_Request req ) |
| { |
| TT_Size ttsize = (TT_Size)size; |
| FT_Error error = FT_Err_Ok; |
| |
| |
| #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS |
| |
| if ( FT_HAS_FIXED_SIZES( size->face ) ) |
| { |
| TT_Face ttface = (TT_Face)size->face; |
| SFNT_Service sfnt = (SFNT_Service)ttface->sfnt; |
| FT_ULong strike_index; |
| |
| |
| error = sfnt->set_sbit_strike( ttface, req, &strike_index ); |
| |
| if ( error ) |
| ttsize->strike_index = 0xFFFFFFFFUL; |
| else |
| return tt_size_select( size, strike_index ); |
| } |
| |
| #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ |
| |
| FT_Request_Metrics( size->face, req ); |
| |
| if ( FT_IS_SCALABLE( size->face ) ) |
| { |
| error = tt_size_reset( ttsize, 0 ); |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| /* for the `MPS' bytecode instruction we need the point size */ |
| if ( !error ) |
| { |
| FT_UInt resolution = |
| ttsize->metrics->x_ppem > ttsize->metrics->y_ppem |
| ? req->horiResolution |
| : req->vertResolution; |
| |
| |
| /* if we don't have a resolution value, assume 72dpi */ |
| if ( req->type == FT_SIZE_REQUEST_TYPE_SCALES || |
| !resolution ) |
| resolution = 72; |
| |
| ttsize->point_size = FT_MulDiv( ttsize->ttmetrics.ppem, |
| 64 * 72, |
| resolution ); |
| } |
| #endif |
| } |
| |
| return error; |
| } |
| |
| |
| /************************************************************************** |
| * |
| * @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. |
| */ |
| static FT_Error |
| tt_glyph_load( FT_GlyphSlot ttslot, /* TT_GlyphSlot */ |
| FT_Size ttsize, /* TT_Size */ |
| FT_UInt glyph_index, |
| FT_Int32 load_flags ) |
| { |
| TT_GlyphSlot slot = (TT_GlyphSlot)ttslot; |
| TT_Size size = (TT_Size)ttsize; |
| FT_Face face = ttslot->face; |
| FT_Error error; |
| |
| |
| if ( !slot ) |
| return FT_THROW( Invalid_Slot_Handle ); |
| |
| if ( !size ) |
| return FT_THROW( Invalid_Size_Handle ); |
| |
| if ( !face ) |
| return FT_THROW( Invalid_Face_Handle ); |
| |
| #ifdef FT_CONFIG_OPTION_INCREMENTAL |
| if ( glyph_index >= (FT_UInt)face->num_glyphs && |
| !face->internal->incremental_interface ) |
| #else |
| if ( glyph_index >= (FT_UInt)face->num_glyphs ) |
| #endif |
| return FT_THROW( Invalid_Argument ); |
| |
| if ( load_flags & FT_LOAD_NO_HINTING ) |
| { |
| /* both FT_LOAD_NO_HINTING and FT_LOAD_NO_AUTOHINT */ |
| /* are necessary to disable hinting for tricky fonts */ |
| |
| if ( FT_IS_TRICKY( face ) ) |
| load_flags &= ~FT_LOAD_NO_HINTING; |
| |
| if ( load_flags & FT_LOAD_NO_AUTOHINT ) |
| load_flags |= FT_LOAD_NO_HINTING; |
| } |
| |
| if ( load_flags & ( FT_LOAD_NO_RECURSE | FT_LOAD_NO_SCALE ) ) |
| { |
| load_flags |= FT_LOAD_NO_BITMAP | FT_LOAD_NO_SCALE; |
| |
| if ( !FT_IS_TRICKY( face ) ) |
| load_flags |= FT_LOAD_NO_HINTING; |
| } |
| |
| /* use hinted metrics only if we load a glyph with hinting */ |
| size->metrics = ( load_flags & FT_LOAD_NO_HINTING ) |
| ? &ttsize->metrics |
| : &size->hinted_metrics; |
| |
| /* now fill in the glyph slot with outline/bitmap/layered */ |
| error = TT_Load_Glyph( size, slot, glyph_index, load_flags ); |
| |
| /* force drop-out mode to 2 - irrelevant now */ |
| /* slot->outline.dropout_mode = 2; */ |
| |
| return error; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /**** ****/ |
| /**** ****/ |
| /**** 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, |
| |
| (FT_Get_MM_Func) NULL, /* get_mm */ |
| (FT_Set_MM_Design_Func) NULL, /* set_mm_design */ |
| (FT_Set_MM_Blend_Func) TT_Set_MM_Blend, /* set_mm_blend */ |
| (FT_Get_MM_Blend_Func) TT_Get_MM_Blend, /* get_mm_blend */ |
| (FT_Get_MM_Var_Func) TT_Get_MM_Var, /* get_mm_var */ |
| (FT_Set_Var_Design_Func) TT_Set_Var_Design, /* set_var_design */ |
| (FT_Get_Var_Design_Func) TT_Get_Var_Design, /* get_var_design */ |
| (FT_Set_Instance_Func) TT_Set_Named_Instance, /* set_instance */ |
| (FT_Set_MM_WeightVector_Func)NULL, /* set_mm_weightvector */ |
| (FT_Get_MM_WeightVector_Func)NULL, /* get_mm_weightvector */ |
| |
| (FT_Get_Var_Blend_Func) tt_get_var_blend, /* get_var_blend */ |
| (FT_Done_Blend_Func) tt_done_blend /* done_blend */ |
| ) |
| |
| FT_DEFINE_SERVICE_METRICSVARIATIONSREC( |
| tt_service_metrics_variations, |
| |
| (FT_HAdvance_Adjust_Func)tt_hadvance_adjust, /* hadvance_adjust */ |
| (FT_LSB_Adjust_Func) NULL, /* lsb_adjust */ |
| (FT_RSB_Adjust_Func) NULL, /* rsb_adjust */ |
| |
| (FT_VAdvance_Adjust_Func)tt_vadvance_adjust, /* vadvance_adjust */ |
| (FT_TSB_Adjust_Func) NULL, /* tsb_adjust */ |
| (FT_BSB_Adjust_Func) NULL, /* bsb_adjust */ |
| (FT_VOrg_Adjust_Func) NULL, /* vorg_adjust */ |
| |
| (FT_Metrics_Adjust_Func) tt_apply_mvar /* metrics_adjust */ |
| ) |
| |
| #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ |
| |
| |
| static const FT_Service_TrueTypeEngineRec tt_service_truetype_engine = |
| { |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| |
| FT_TRUETYPE_ENGINE_TYPE_PATENTED |
| |
| #else /* !TT_USE_BYTECODE_INTERPRETER */ |
| |
| FT_TRUETYPE_ENGINE_TYPE_NONE |
| |
| #endif /* TT_USE_BYTECODE_INTERPRETER */ |
| }; |
| |
| |
| 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 ) |
| { |
| FT_Library library; |
| FT_Module_Interface result; |
| FT_Module sfntd; |
| SFNT_Service sfnt; |
| |
| |
| result = ft_service_list_lookup( tt_services, tt_interface ); |
| if ( result ) |
| return result; |
| |
| if ( !driver ) |
| return NULL; |
| library = driver->library; |
| if ( !library ) |
| return NULL; |
| |
| /* only return the default interface from the SFNT module */ |
| sfntd = FT_Get_Module( library, "sfnt" ); |
| if ( sfntd ) |
| { |
| sfnt = (SFNT_Service)( sfntd->clazz->module_interface ); |
| if ( sfnt ) |
| return sfnt->get_interface( driver, tt_interface ); |
| } |
| |
| return 0; |
| } |
| |
| |
| /* The FT_DriverInterface structure is defined in ftdriver.h. */ |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| #define TT_HINTER_FLAG FT_MODULE_DRIVER_HAS_HINTER |
| #else |
| #define TT_HINTER_FLAG 0 |
| #endif |
| |
| #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS |
| #define TT_SIZE_SELECT tt_size_select |
| #else |
| #define TT_SIZE_SELECT 0 |
| #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 */ |
