kc3-lang/freetype/src/cff/t2objs.c
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Hash : f0df85ba
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Date : 2000-06-22T00:17:42
- MAJOR INTERNAL REDESIGN: A lot of internal modifications have been performed lately on the source in order to provide the following enhancements: - more generic module support: The FT_Module type is now defined to represent a handle to a given module. The file <freetype/ftmodule.h> contains the FT_Module_Class definition, as well as the module-loading public API The FT_Driver type is still defined, and still represents a pointer to a font driver. Note that FT_Add_Driver is replaced by FT_Add_Module, FT_Get_Driver by FT_Get_Module, etc.. - support for generic glyph image types: The FT_Renderer type is a pointer to a module used to perform various operations on glyph image. Each renderer is capable of handling images in a single format (e.g. ft_glyph_format_outline). Its functions are used to: - transform an glyph image - render a glyph image into a bitmap - return the control box (dimensions) of a given glyph image The scan converters "ftraster.c" and "ftgrays.c" have been moved to the new directory "src/renderer", and are used to provide two default renderer modules. One corresponds to the "standard" scan-converter, the other to the "smooth" one. The current renderer can be set through the new function FT_Set_Renderer. The old raster-related function FT_Set_Raster, FT_Get_Raster and FT_Set_Raster_Mode have now disappeared, in favor of the new: FT_Get_Renderer FT_Set_Renderer see the file <freetype/ftrender.h> for more details.. These changes were necessary to properly support different scalable formats in the future, like bi-color glyphs, etc.. - glyph loader object: A new internal object, called a 'glyph loader' has been introduced in the base layer. It is used by all scalable format font drivers to load glyphs and composites. This object has been created to reduce the code size of each driver, as each one of them basically re-implemented its functionality. See <freetype/internal/ftobjs.h> and the FT_GlyphLoader type for more information.. - FT_GlyphSlot had new fields: In order to support extended features (see below), the FT_GlyphSlot structure has a few new fields: linearHoriAdvance: this field gives the linearly scaled (i.e. scaled but unhinted) advance width for the glyph, expressed as a 16.16 fixed pixel value. This is useful to perform WYSIWYG text. linearVertAdvance: this field gives the linearly scaled advance height for the glyph (relevant in vertical glyph layouts only). This is useful to perform WYSIWYG text. Note that the two above field replace the removed "metrics2" field in the glyph slot. advance: this field is a vector that gives the transformed advance for the glyph. By default, it corresponds to the advance width, unless FT_LOAD_VERTICAL_LAYOUT was specified when calling FT_Load_Glyph or FT_Load_Char bitmap_left: this field gives the distance in integer pixels from the current pen position to the left-most pixel of a glyph image WHEN IT IS A BITMAP. It is only valid when the "format" field is set to "ft_glyph_format_bitmap", for example, after calling the new function FT_Render_Glyph. bitmap_top: this field gives the distance in integer pixels from the current pen position (located on the baseline) to the top-most pixel of the glyph image WHEN IT IS A BITMAP. Positive values correspond to upwards Y. loader: this is a new private field for the glyph slot. Client applications should not touch it.. - support for transforms and direct rendering in FT_Load_Glyph: Most of the functionality found in <freetype/ftglyph.h> has been moved to the core library. Hence, the following: - a transform can be specified for a face through FT_Set_Transform. this transform is applied by FT_Load_Glyph to scalable glyph images (i.e. NOT TO BITMAPS) before the function returns, unless the bit flag FT_LOAD_IGNORE_TRANSFORM was set in the load flags.. - once a glyph image has been loaded, it can be directly converted to a bitmap by using the new FT_Render_Glyph function. Note that this function takes the glyph image from the glyph slot, and converts it to a bitmap whose properties are returned in "face.glyph.bitmap", "face.glyph.bitmap_left" and "face.glyph.bitmap_top". The original native image might be lost after the conversion. - when using the new bit flag FT_LOAD_RENDER, the FT_Load_Glyph and FT_Load_Char functions will call FT_Render_Glyph automatically when needed.
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src/cff/t2objs.c
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/***************************************************************************/ /* */ /* t2objs.c */ /* */ /* OpenType objects manager (body). */ /* */ /* Copyright 1996-2000 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/ftcalc.h> #include <freetype/internal/ftstream.h> #include <freetype/ttnameid.h> #include <freetype/tttags.h> #include <freetype/internal/sfnt.h> #include <freetype/internal/psnames.h> #include <t2objs.h> #include <t2load.h> #include <freetype/internal/t2errors.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_t2objs /*************************************************************************/ /* */ /* FACE FUNCTIONS */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* T2_Init_Face */ /* */ /* <Description> */ /* Initializes a given OpenType face object. */ /* */ /* <Input> */ /* stream :: The source font stream. */ /* */ /* face_index :: The index of the font face in the resource. */ /* */ /* num_params :: Number of additional generic parameters. Ignored. */ /* */ /* params :: Additional generic parameters. Ignored. */ /* */ /* <InOut> */ /* face :: The newly built face object. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ LOCAL_DEF FT_Error T2_Init_Face( FT_Stream stream, T2_Face face, FT_Int face_index, FT_Int num_params, FT_Parameter* params ) { FT_Error error; SFNT_Interface* sfnt; sfnt = (SFNT_Interface*) FT_Get_Module_Interface( face->root.driver->root.library,"sfnt" ); if ( !sfnt ) goto Bad_Format; /* create input stream from resource */ if ( FILE_Seek( 0 ) ) goto Exit; /* check that we have a valid OpenType file */ error = sfnt->init_face( stream, face, face_index, num_params, params ); if ( error ) goto Exit; if ( face->format_tag != 0x4f54544fL ) /* OpenType/CFF font */ { FT_TRACE2(( "[not a valid OpenType/CFF font]\n" )); goto Bad_Format; } /* If we are performing a simple font format check, exit immediately */ if ( face_index < 0 ) return T2_Err_Ok; /* Load font directory */ error = sfnt->load_face( stream, face, face_index, num_params, params ); if ( error ) goto Exit; /* now, load the CFF part of the file.. */ error = face->goto_table( face, TTAG_CFF, stream, 0 ); if ( error ) goto Exit; { CFF_Font* cff; FT_Memory memory = face->root.memory; FT_Face root; if ( ALLOC( cff, sizeof ( *cff ) ) ) goto Exit; face->other = cff; error = T2_Load_CFF_Font( stream, face_index, cff ); if ( error ) goto Exit; /* Complement the root flags with some interesting information. */ /* note that for OpenType/CFF, there is no need to do this, but */ /* this will be necessary for pure CFF fonts through. */ root = &face->root; } Exit: return error; Bad_Format: error = FT_Err_Unknown_File_Format; goto Exit; } /*************************************************************************/ /* */ /* <Function> */ /* T2_Done_Face */ /* */ /* <Description> */ /* Finalizes a given face object. */ /* */ /* <Input> */ /* face :: A pointer to the face object to destroy. */ /* */ LOCAL_DEF void T2_Done_Face( T2_Face face ) { FT_Memory memory = face->root.memory; SFNT_Interface* sfnt = face->sfnt; if ( sfnt ) sfnt->done_face( face ); { CFF_Font* cff = (CFF_Font*)face->other; if ( cff ) { T2_Done_CFF_Font( cff ); FREE( face->other ); } } } /*************************************************************************/ /* */ /* <Function> */ /* T2_Init_Driver */ /* */ /* <Description> */ /* Initializes a given OpenType driver object. */ /* */ /* <Input> */ /* driver :: A handle to the target driver object. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ LOCAL_FUNC FT_Error T2_Init_Driver( T2_Driver driver ) { /* init extension registry if needed */ #ifdef TT_CONFIG_OPTION_EXTEND_ENGINE return TT_Init_Extensions( driver ); #else return T2_Err_Ok; #endif } /*************************************************************************/ /* */ /* <Function> */ /* T2_Done_Driver */ /* */ /* <Description> */ /* Finalizes a given OpenType driver. */ /* */ /* <Input> */ /* driver :: A handle to the target OpenType driver. */ /* */ LOCAL_FUNC void T2_Done_Driver( T2_Driver driver ) { /* destroy extensions registry if needed */ #ifdef TT_CONFIG_OPTION_EXTEND_ENGINE TT_Done_Extensions( driver ); #endif } /* END */