kc3-lang/freetype/src/truetype/ttobjs.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/truetype/ttobjs.c
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/***************************************************************************/ /* */ /* ttobjs.c */ /* */ /* 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 <ttobjs.h> #include <ttpload.h> #include <freetype/internal/tterrors.h> #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER #include <ttinterp.h> #endif /*************************************************************************/ /* */ /* 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_ttobjs /*************************************************************************/ /* */ /* GLYPH ZONE FUNCTIONS */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* TT_Done_GlyphZone */ /* */ /* <Description> */ /* Deallocates a glyph zone. */ /* */ /* <Input> */ /* zone :: A pointer to the target glyph zone. */ /* */ LOCAL_FUNC void TT_Done_GlyphZone( TT_GlyphZone* zone ) { FT_Memory memory = zone->memory; FREE( zone->contours ); FREE( zone->tags ); FREE( zone->cur ); FREE( zone->org ); zone->max_points = zone->n_points = 0; zone->max_contours = zone->n_contours = 0; } /*************************************************************************/ /* */ /* <Function> */ /* TT_New_GlyphZone */ /* */ /* <Description> */ /* Allocates a new glyph zone. */ /* */ /* <Input> */ /* memory :: A handle to the current memory object. */ /* */ /* maxPoints :: The capacity of glyph zone in points. */ /* */ /* maxContours :: The capacity of glyph zone in contours. */ /* */ /* <Output> */ /* zone :: A pointer to the target glyph zone record. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ LOCAL_FUNC FT_Error TT_New_GlyphZone( FT_Memory memory, FT_UShort maxPoints, FT_Short maxContours, TT_GlyphZone* zone ) { FT_Error error; if ( maxPoints > 0 ) maxPoints += 2; MEM_Set( zone, 0, sizeof ( *zone ) ); zone->memory = memory; if ( ALLOC_ARRAY( zone->org, maxPoints * 2, FT_F26Dot6 ) || ALLOC_ARRAY( zone->cur, maxPoints * 2, FT_F26Dot6 ) || ALLOC_ARRAY( zone->tags, maxPoints, FT_Byte ) || ALLOC_ARRAY( zone->contours, maxContours, FT_UShort ) ) { TT_Done_GlyphZone( zone ); } return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Init_Face */ /* */ /* <Description> */ /* Initializes a given TrueType 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 TT_Init_Face( FT_Stream stream, TT_Face face, FT_Int face_index, FT_Int num_params, FT_Parameter* params ) { FT_Error error; FT_Library library; SFNT_Interface* sfnt; library = face->root.driver->root.library; sfnt = (SFNT_Interface*)FT_Get_Module_Interface( library, "sfnt" ); if (!sfnt) goto Bad_Format; /* create input stream from resource */ if ( FILE_Seek( 0 ) ) goto Exit; /* check that we have a valid TrueType file */ error = sfnt->init_face( stream, face, face_index, num_params, params ); if ( error ) goto Exit; /* We must also be able to accept Mac/GX fonts, as well as OT ones */ if ( face->format_tag != 0x00010000L && /* MS fonts */ face->format_tag != TTAG_true ) /* Mac fonts */ { FT_TRACE2(( "[not a valid TTF font]\n" )); goto Bad_Format; } /* If we are performing a simple font format check, exit immediately */ if ( face_index < 0 ) return TT_Err_Ok; /* Load font directory */ error = sfnt->load_face( stream, face, face_index, num_params, params ); if ( error ) goto Exit; error = TT_Load_Locations( face, stream ) || TT_Load_CVT ( face, stream ) || TT_Load_Programs ( face, stream ); Exit: return error; Bad_Format: error = FT_Err_Unknown_File_Format; goto Exit; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Done_Face */ /* */ /* <Description> */ /* Finalizes a given face object. */ /* */ /* <Input> */ /* face :: A pointer to the face object to destroy. */ /* */ LOCAL_DEF void TT_Done_Face( TT_Face face ) { FT_Memory memory = face->root.memory; FT_Stream stream = face->root.stream; SFNT_Interface* sfnt = face->sfnt; if ( sfnt ) sfnt->done_face( face ); /* freeing the locations table */ FREE( face->glyph_locations ); face->num_locations = 0; /* freeing the CVT */ FREE( face->cvt ); face->cvt_size = 0; /* freeing the programs */ RELEASE_Frame( face->font_program ); RELEASE_Frame( face->cvt_program ); face->font_program_size = 0; face->cvt_program_size = 0; } /*************************************************************************/ /* */ /* SIZE FUNCTIONS */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* TT_Init_Size */ /* */ /* <Description> */ /* Initializes a new TrueType size object. */ /* */ /* <InOut> */ /* size :: A handle to the size object. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ LOCAL_DEF FT_Error TT_Init_Size( TT_Size size ) { FT_Error error = 0; #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER TT_Face face = (TT_Face)size->root.face; FT_Memory memory = face->root.memory; FT_Int i; TT_ExecContext exec; FT_UShort n_twilight; TT_MaxProfile* maxp = &face->max_profile; size->ttmetrics.valid = FALSE; size->max_function_defs = maxp->maxFunctionDefs; size->max_instruction_defs = maxp->maxInstructionDefs; size->num_function_defs = 0; size->num_instruction_defs = 0; size->max_func = 0; size->max_ins = 0; size->cvt_size = face->cvt_size; size->storage_size = maxp->maxStorage; /* Set default metrics */ { FT_Size_Metrics* metrics = &size->root.metrics; TT_Size_Metrics* metrics2 = &size->ttmetrics; metrics->x_ppem = 0; metrics->y_ppem = 0; metrics2->rotated = FALSE; metrics2->stretched = FALSE; /* set default compensation (all 0) */ for ( i = 0; i < 4; i++ ) metrics2->compensations[i] = 0; } /* allocate function defs, instruction defs, cvt, and storage area */ if ( ALLOC_ARRAY( size->function_defs, size->max_function_defs, TT_DefRecord ) || ALLOC_ARRAY( size->instruction_defs, size->max_instruction_defs, TT_DefRecord ) || ALLOC_ARRAY( size->cvt, size->cvt_size, FT_Long ) || ALLOC_ARRAY( size->storage, size->storage_size, FT_Long ) ) goto Fail_Memory; /* reserve twilight zone */ n_twilight = maxp->maxTwilightPoints; error = TT_New_GlyphZone( memory, n_twilight, 0, &size->twilight ); if ( error ) goto Fail_Memory; size->twilight.n_points = n_twilight; /* set `face->interpreter' according to the debug hook present */ { FT_Library library = face->root.driver->root.library; face->interpreter = (TT_Interpreter) library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE]; if ( !face->interpreter ) face->interpreter = (TT_Interpreter)TT_RunIns; } /* Fine, now execute the font program! */ exec = size->context; /* size objects used during debugging have their own context */ if ( !size->debug ) exec = TT_New_Context( face ); if ( !exec ) { error = TT_Err_Could_Not_Find_Context; goto Fail_Memory; } size->GS = tt_default_graphics_state; TT_Load_Context( exec, face, size ); exec->callTop = 0; exec->top = 0; exec->period = 64; exec->phase = 0; exec->threshold = 0; { FT_Size_Metrics* metrics = &exec->metrics; TT_Size_Metrics* tt_metrics = &exec->tt_metrics; metrics->x_ppem = 0; metrics->y_ppem = 0; metrics->x_scale = 0; metrics->y_scale = 0; tt_metrics->ppem = 0; tt_metrics->scale = 0; tt_metrics->ratio = 0x10000L; } exec->instruction_trap = FALSE; exec->cvtSize = size->cvt_size; exec->cvt = size->cvt; exec->F_dot_P = 0x10000L; /* allow font program execution */ TT_Set_CodeRange( exec, tt_coderange_font, face->font_program, face->font_program_size ); /* disable CVT and glyph programs coderange */ TT_Clear_CodeRange( exec, tt_coderange_cvt ); TT_Clear_CodeRange( exec, tt_coderange_glyph ); if ( face->font_program_size > 0 ) { error = TT_Goto_CodeRange( exec, tt_coderange_font, 0 ); if ( !error ) error = face->interpreter( exec ); if ( error ) goto Fail_Exec; } else error = TT_Err_Ok; TT_Save_Context( exec, size ); if ( !size->debug ) TT_Done_Context( exec ); #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ size->ttmetrics.valid = FALSE; return error; #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER Fail_Exec: if ( !size->debug ) TT_Done_Context( exec ); Fail_Memory: #endif TT_Done_Size( size ); return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Done_Size */ /* */ /* <Description> */ /* The TrueType size object finalizer. */ /* */ /* <Input> */ /* size :: A handle to the target size object. */ /* */ LOCAL_FUNC void TT_Done_Size( TT_Size size ) { #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER FT_Memory memory = size->root.face->memory; if ( size->debug ) { /* the debug context must be deleted by the debugger itself */ size->context = NULL; size->debug = FALSE; } FREE( size->cvt ); size->cvt_size = 0; /* free storage area */ FREE( size->storage ); size->storage_size = 0; /* twilight zone */ TT_Done_GlyphZone( &size->twilight ); FREE( size->function_defs ); FREE( size->instruction_defs ); size->num_function_defs = 0; size->max_function_defs = 0; size->num_instruction_defs = 0; size->max_instruction_defs = 0; size->max_func = 0; size->max_ins = 0; #endif size->ttmetrics.valid = FALSE; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Reset_Size */ /* */ /* <Description> */ /* Resets a TrueType size when resolutions and character dimensions */ /* have been changed. */ /* */ /* <Input> */ /* size :: A handle to the target size object. */ /* */ LOCAL_DEF FT_Error TT_Reset_Size( TT_Size size ) { TT_Face face; FT_Error error = TT_Err_Ok; FT_Size_Metrics* metrics; if ( size->ttmetrics.valid ) return TT_Err_Ok; face = (TT_Face)size->root.face; metrics = &size->root.metrics; if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 ) return TT_Err_Invalid_PPem; /* compute new transformation */ if ( metrics->x_ppem >= metrics->y_ppem ) { size->ttmetrics.scale = metrics->x_scale; size->ttmetrics.ppem = metrics->x_ppem; size->ttmetrics.x_ratio = 0x10000L; size->ttmetrics.y_ratio = FT_MulDiv( metrics->y_ppem, 0x10000L, metrics->x_ppem ); } else { size->ttmetrics.scale = metrics->y_scale; size->ttmetrics.ppem = metrics->y_ppem; size->ttmetrics.x_ratio = FT_MulDiv( metrics->x_ppem, 0x10000L, metrics->y_ppem ); size->ttmetrics.y_ratio = 0x10000L; } /* Compute root ascender, descender, test height, and max_advance */ metrics->ascender = ( FT_MulFix( face->root.ascender, metrics->y_scale ) + 32 ) & -64; metrics->descender = ( FT_MulFix( face->root.descender, metrics->y_scale ) + 32 ) & -64; metrics->height = ( FT_MulFix( face->root.height, metrics->y_scale ) + 32 ) & -64; metrics->max_advance = ( FT_MulFix( face->root.max_advance_width, metrics->x_scale ) + 32 ) & -64; #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER { TT_ExecContext exec; FT_UInt i, j; /* Scale the cvt values to the new ppem. */ /* We use by default the y ppem to scale the CVT. */ for ( i = 0; i < size->cvt_size; i++ ) size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); /* All twilight points are originally zero */ for ( j = 0; j < size->twilight.n_points; j++ ) { size->twilight.org[j].x = 0; size->twilight.org[j].y = 0; size->twilight.cur[j].x = 0; size->twilight.cur[j].y = 0; } /* clear storage area */ for ( i = 0; i < size->storage_size; i++ ) size->storage[i] = 0; size->GS = tt_default_graphics_state; /* get execution context and run prep program */ if ( size->debug ) exec = size->context; else exec = TT_New_Context( face ); /* debugging instances have their own context */ if ( !exec ) return TT_Err_Could_Not_Find_Context; TT_Load_Context( exec, face, size ); TT_Set_CodeRange( exec, tt_coderange_cvt, face->cvt_program, face->cvt_program_size ); TT_Clear_CodeRange( exec, tt_coderange_glyph ); exec->instruction_trap = FALSE; exec->top = 0; exec->callTop = 0; if ( face->cvt_program_size > 0 ) { error = TT_Goto_CodeRange( exec, tt_coderange_cvt, 0 ); if ( error ) goto Fin; if ( !size->debug ) error = face->interpreter( exec ); } else error = TT_Err_Ok; size->GS = exec->GS; /* save default graphics state */ Fin: TT_Save_Context( exec, size ); if ( !size->debug ) TT_Done_Context( exec ); /* debugging instances keep their context */ } #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ if ( !error ) size->ttmetrics.valid = TRUE; return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Init_Driver */ /* */ /* <Description> */ /* Initializes a given TrueType driver object. */ /* */ /* <Input> */ /* driver :: A handle to the target driver object. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ LOCAL_FUNC FT_Error TT_Init_Driver( TT_Driver driver ) { FT_Error error; /* set 'extra' in glyph loader */ error = FT_GlyphLoader_Create_Extra( FT_DRIVER(driver)->glyph_loader ); /* init extension registry if needed */ #ifdef TT_CONFIG_OPTION_EXTEND_ENGINE if (!error) return TT_Init_Extensions( driver ); #endif return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Done_Driver */ /* */ /* <Description> */ /* Finalizes a given TrueType driver. */ /* */ /* <Input> */ /* driver :: A handle to the target TrueType driver. */ /* */ LOCAL_FUNC void TT_Done_Driver( TT_Driver driver ) { /* destroy extensions registry if needed */ #ifdef TT_CONFIG_OPTION_EXTEND_ENGINE TT_Done_Extensions( driver ); #endif #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER /* destroy the execution context */ if ( driver->context ) { TT_Destroy_Context( driver->context, driver->root.root.memory ); driver->context = NULL; } #endif } /* END */