| /**************************************************************************** |
| * |
| * pshints.h |
| * |
| * Interface to Postscript-specific (Type 1 and Type 2) hints |
| * recorders (specification only). These are used to support native |
| * T1/T2 hints in the 'type1', 'cid', and 'cff' font drivers. |
| * |
| * Copyright (C) 2001-2021 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. |
| * |
| */ |
| |
| |
| #ifndef PSHINTS_H_ |
| #define PSHINTS_H_ |
| |
| |
| #include <freetype/freetype.h> |
| #include <freetype/t1tables.h> |
| |
| |
| FT_BEGIN_HEADER |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** INTERNAL REPRESENTATION OF GLOBALS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| typedef struct PSH_GlobalsRec_* PSH_Globals; |
| |
| typedef FT_Error |
| (*PSH_Globals_NewFunc)( FT_Memory memory, |
| T1_Private* private_dict, |
| PSH_Globals* aglobals ); |
| |
| typedef void |
| (*PSH_Globals_SetScaleFunc)( PSH_Globals globals, |
| FT_Fixed x_scale, |
| FT_Fixed y_scale, |
| FT_Fixed x_delta, |
| FT_Fixed y_delta ); |
| |
| typedef void |
| (*PSH_Globals_DestroyFunc)( PSH_Globals globals ); |
| |
| |
| typedef struct PSH_Globals_FuncsRec_ |
| { |
| PSH_Globals_NewFunc create; |
| PSH_Globals_SetScaleFunc set_scale; |
| PSH_Globals_DestroyFunc destroy; |
| |
| } PSH_Globals_FuncsRec, *PSH_Globals_Funcs; |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** PUBLIC TYPE 1 HINTS RECORDER *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /************************************************************************** |
| * |
| * @type: |
| * T1_Hints |
| * |
| * @description: |
| * This is a handle to an opaque structure used to record glyph hints |
| * from a Type 1 character glyph character string. |
| * |
| * The methods used to operate on this object are defined by the |
| * @T1_Hints_FuncsRec structure. Recording glyph hints is normally |
| * achieved through the following scheme: |
| * |
| * - Open a new hint recording session by calling the 'open' method. |
| * This rewinds the recorder and prepare it for new input. |
| * |
| * - For each hint found in the glyph charstring, call the corresponding |
| * method ('stem', 'stem3', or 'reset'). Note that these functions do |
| * not return an error code. |
| * |
| * - Close the recording session by calling the 'close' method. It |
| * returns an error code if the hints were invalid or something strange |
| * happened (e.g., memory shortage). |
| * |
| * The hints accumulated in the object can later be used by the |
| * PostScript hinter. |
| * |
| */ |
| typedef struct T1_HintsRec_* T1_Hints; |
| |
| |
| /************************************************************************** |
| * |
| * @type: |
| * T1_Hints_Funcs |
| * |
| * @description: |
| * A pointer to the @T1_Hints_FuncsRec structure that defines the API of |
| * a given @T1_Hints object. |
| * |
| */ |
| typedef const struct T1_Hints_FuncsRec_* T1_Hints_Funcs; |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T1_Hints_OpenFunc |
| * |
| * @description: |
| * A method of the @T1_Hints class used to prepare it for a new Type 1 |
| * hints recording session. |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 1 hints recorder. |
| * |
| * @note: |
| * You should always call the @T1_Hints_CloseFunc method in order to |
| * close an opened recording session. |
| * |
| */ |
| typedef void |
| (*T1_Hints_OpenFunc)( T1_Hints hints ); |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T1_Hints_SetStemFunc |
| * |
| * @description: |
| * A method of the @T1_Hints class used to record a new horizontal or |
| * vertical stem. This corresponds to the Type 1 'hstem' and 'vstem' |
| * operators. |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 1 hints recorder. |
| * |
| * dimension :: |
| * 0 for horizontal stems (hstem), 1 for vertical ones (vstem). |
| * |
| * coords :: |
| * Array of 2 coordinates in 16.16 format, used as (position,length) |
| * stem descriptor. |
| * |
| * @note: |
| * Use vertical coordinates (y) for horizontal stems (dim=0). Use |
| * horizontal coordinates (x) for vertical stems (dim=1). |
| * |
| * 'coords[0]' is the absolute stem position (lowest coordinate); |
| * 'coords[1]' is the length. |
| * |
| * The length can be negative, in which case it must be either -20 or |
| * -21. It is interpreted as a 'ghost' stem, according to the Type 1 |
| * specification. |
| * |
| * If the length is -21 (corresponding to a bottom ghost stem), then the |
| * real stem position is 'coords[0]+coords[1]'. |
| * |
| */ |
| typedef void |
| (*T1_Hints_SetStemFunc)( T1_Hints hints, |
| FT_UInt dimension, |
| FT_Fixed* coords ); |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T1_Hints_SetStem3Func |
| * |
| * @description: |
| * A method of the @T1_Hints class used to record three |
| * counter-controlled horizontal or vertical stems at once. |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 1 hints recorder. |
| * |
| * dimension :: |
| * 0 for horizontal stems, 1 for vertical ones. |
| * |
| * coords :: |
| * An array of 6 values in 16.16 format, holding 3 (position,length) |
| * pairs for the counter-controlled stems. |
| * |
| * @note: |
| * Use vertical coordinates (y) for horizontal stems (dim=0). Use |
| * horizontal coordinates (x) for vertical stems (dim=1). |
| * |
| * The lengths cannot be negative (ghost stems are never |
| * counter-controlled). |
| * |
| */ |
| typedef void |
| (*T1_Hints_SetStem3Func)( T1_Hints hints, |
| FT_UInt dimension, |
| FT_Fixed* coords ); |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T1_Hints_ResetFunc |
| * |
| * @description: |
| * A method of the @T1_Hints class used to reset the stems hints in a |
| * recording session. |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 1 hints recorder. |
| * |
| * end_point :: |
| * The index of the last point in the input glyph in which the |
| * previously defined hints apply. |
| * |
| */ |
| typedef void |
| (*T1_Hints_ResetFunc)( T1_Hints hints, |
| FT_UInt end_point ); |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T1_Hints_CloseFunc |
| * |
| * @description: |
| * A method of the @T1_Hints class used to close a hint recording |
| * session. |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 1 hints recorder. |
| * |
| * end_point :: |
| * The index of the last point in the input glyph. |
| * |
| * @return: |
| * FreeType error code. 0 means success. |
| * |
| * @note: |
| * The error code is set to indicate that an error occurred during the |
| * recording session. |
| * |
| */ |
| typedef FT_Error |
| (*T1_Hints_CloseFunc)( T1_Hints hints, |
| FT_UInt end_point ); |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T1_Hints_ApplyFunc |
| * |
| * @description: |
| * A method of the @T1_Hints class used to apply hints to the |
| * corresponding glyph outline. Must be called once all hints have been |
| * recorded. |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 1 hints recorder. |
| * |
| * outline :: |
| * A pointer to the target outline descriptor. |
| * |
| * globals :: |
| * The hinter globals for this font. |
| * |
| * hint_mode :: |
| * Hinting information. |
| * |
| * @return: |
| * FreeType error code. 0 means success. |
| * |
| * @note: |
| * On input, all points within the outline are in font coordinates. On |
| * output, they are in 1/64th of pixels. |
| * |
| * The scaling transformation is taken from the 'globals' object which |
| * must correspond to the same font as the glyph. |
| * |
| */ |
| typedef FT_Error |
| (*T1_Hints_ApplyFunc)( T1_Hints hints, |
| FT_Outline* outline, |
| PSH_Globals globals, |
| FT_Render_Mode hint_mode ); |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * T1_Hints_FuncsRec |
| * |
| * @description: |
| * The structure used to provide the API to @T1_Hints objects. |
| * |
| * @fields: |
| * hints :: |
| * A handle to the T1 Hints recorder. |
| * |
| * open :: |
| * The function to open a recording session. |
| * |
| * close :: |
| * The function to close a recording session. |
| * |
| * stem :: |
| * The function to set a simple stem. |
| * |
| * stem3 :: |
| * The function to set counter-controlled stems. |
| * |
| * reset :: |
| * The function to reset stem hints. |
| * |
| * apply :: |
| * The function to apply the hints to the corresponding glyph outline. |
| * |
| */ |
| typedef struct T1_Hints_FuncsRec_ |
| { |
| T1_Hints hints; |
| T1_Hints_OpenFunc open; |
| T1_Hints_CloseFunc close; |
| T1_Hints_SetStemFunc stem; |
| T1_Hints_SetStem3Func stem3; |
| T1_Hints_ResetFunc reset; |
| T1_Hints_ApplyFunc apply; |
| |
| } T1_Hints_FuncsRec; |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** PUBLIC TYPE 2 HINTS RECORDER *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /************************************************************************** |
| * |
| * @type: |
| * T2_Hints |
| * |
| * @description: |
| * This is a handle to an opaque structure used to record glyph hints |
| * from a Type 2 character glyph character string. |
| * |
| * The methods used to operate on this object are defined by the |
| * @T2_Hints_FuncsRec structure. Recording glyph hints is normally |
| * achieved through the following scheme: |
| * |
| * - Open a new hint recording session by calling the 'open' method. |
| * This rewinds the recorder and prepare it for new input. |
| * |
| * - For each hint found in the glyph charstring, call the corresponding |
| * method ('stems', 'hintmask', 'counters'). Note that these functions |
| * do not return an error code. |
| * |
| * - Close the recording session by calling the 'close' method. It |
| * returns an error code if the hints were invalid or something strange |
| * happened (e.g., memory shortage). |
| * |
| * The hints accumulated in the object can later be used by the |
| * Postscript hinter. |
| * |
| */ |
| typedef struct T2_HintsRec_* T2_Hints; |
| |
| |
| /************************************************************************** |
| * |
| * @type: |
| * T2_Hints_Funcs |
| * |
| * @description: |
| * A pointer to the @T2_Hints_FuncsRec structure that defines the API of |
| * a given @T2_Hints object. |
| * |
| */ |
| typedef const struct T2_Hints_FuncsRec_* T2_Hints_Funcs; |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T2_Hints_OpenFunc |
| * |
| * @description: |
| * A method of the @T2_Hints class used to prepare it for a new Type 2 |
| * hints recording session. |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 2 hints recorder. |
| * |
| * @note: |
| * You should always call the @T2_Hints_CloseFunc method in order to |
| * close an opened recording session. |
| * |
| */ |
| typedef void |
| (*T2_Hints_OpenFunc)( T2_Hints hints ); |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T2_Hints_StemsFunc |
| * |
| * @description: |
| * A method of the @T2_Hints class used to set the table of stems in |
| * either the vertical or horizontal dimension. Equivalent to the |
| * 'hstem', 'vstem', 'hstemhm', and 'vstemhm' Type 2 operators. |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 2 hints recorder. |
| * |
| * dimension :: |
| * 0 for horizontal stems (hstem), 1 for vertical ones (vstem). |
| * |
| * count :: |
| * The number of stems. |
| * |
| * coords :: |
| * An array of 'count' (position,length) pairs in 16.16 format. |
| * |
| * @note: |
| * Use vertical coordinates (y) for horizontal stems (dim=0). Use |
| * horizontal coordinates (x) for vertical stems (dim=1). |
| * |
| * There are '2*count' elements in the 'coords' array. Each even element |
| * is an absolute position in font units, each odd element is a length in |
| * font units. |
| * |
| * A length can be negative, in which case it must be either -20 or -21. |
| * It is interpreted as a 'ghost' stem, according to the Type 1 |
| * specification. |
| * |
| */ |
| typedef void |
| (*T2_Hints_StemsFunc)( T2_Hints hints, |
| FT_UInt dimension, |
| FT_Int count, |
| FT_Fixed* coordinates ); |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T2_Hints_MaskFunc |
| * |
| * @description: |
| * A method of the @T2_Hints class used to set a given hintmask (this |
| * corresponds to the 'hintmask' Type 2 operator). |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 2 hints recorder. |
| * |
| * end_point :: |
| * The glyph index of the last point to which the previously defined or |
| * activated hints apply. |
| * |
| * bit_count :: |
| * The number of bits in the hint mask. |
| * |
| * bytes :: |
| * An array of bytes modelling the hint mask. |
| * |
| * @note: |
| * If the hintmask starts the charstring (before any glyph point |
| * definition), the value of `end_point` should be 0. |
| * |
| * `bit_count` is the number of meaningful bits in the 'bytes' array; it |
| * must be equal to the total number of hints defined so far (i.e., |
| * horizontal+verticals). |
| * |
| * The 'bytes' array can come directly from the Type 2 charstring and |
| * respects the same format. |
| * |
| */ |
| typedef void |
| (*T2_Hints_MaskFunc)( T2_Hints hints, |
| FT_UInt end_point, |
| FT_UInt bit_count, |
| const FT_Byte* bytes ); |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T2_Hints_CounterFunc |
| * |
| * @description: |
| * A method of the @T2_Hints class used to set a given counter mask (this |
| * corresponds to the 'hintmask' Type 2 operator). |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 2 hints recorder. |
| * |
| * end_point :: |
| * A glyph index of the last point to which the previously defined or |
| * active hints apply. |
| * |
| * bit_count :: |
| * The number of bits in the hint mask. |
| * |
| * bytes :: |
| * An array of bytes modelling the hint mask. |
| * |
| * @note: |
| * If the hintmask starts the charstring (before any glyph point |
| * definition), the value of `end_point` should be 0. |
| * |
| * `bit_count` is the number of meaningful bits in the 'bytes' array; it |
| * must be equal to the total number of hints defined so far (i.e., |
| * horizontal+verticals). |
| * |
| * The 'bytes' array can come directly from the Type 2 charstring and |
| * respects the same format. |
| * |
| */ |
| typedef void |
| (*T2_Hints_CounterFunc)( T2_Hints hints, |
| FT_UInt bit_count, |
| const FT_Byte* bytes ); |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T2_Hints_CloseFunc |
| * |
| * @description: |
| * A method of the @T2_Hints class used to close a hint recording |
| * session. |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 2 hints recorder. |
| * |
| * end_point :: |
| * The index of the last point in the input glyph. |
| * |
| * @return: |
| * FreeType error code. 0 means success. |
| * |
| * @note: |
| * The error code is set to indicate that an error occurred during the |
| * recording session. |
| * |
| */ |
| typedef FT_Error |
| (*T2_Hints_CloseFunc)( T2_Hints hints, |
| FT_UInt end_point ); |
| |
| |
| /************************************************************************** |
| * |
| * @functype: |
| * T2_Hints_ApplyFunc |
| * |
| * @description: |
| * A method of the @T2_Hints class used to apply hints to the |
| * corresponding glyph outline. Must be called after the 'close' method. |
| * |
| * @input: |
| * hints :: |
| * A handle to the Type 2 hints recorder. |
| * |
| * outline :: |
| * A pointer to the target outline descriptor. |
| * |
| * globals :: |
| * The hinter globals for this font. |
| * |
| * hint_mode :: |
| * Hinting information. |
| * |
| * @return: |
| * FreeType error code. 0 means success. |
| * |
| * @note: |
| * On input, all points within the outline are in font coordinates. On |
| * output, they are in 1/64th of pixels. |
| * |
| * The scaling transformation is taken from the 'globals' object which |
| * must correspond to the same font than the glyph. |
| * |
| */ |
| typedef FT_Error |
| (*T2_Hints_ApplyFunc)( T2_Hints hints, |
| FT_Outline* outline, |
| PSH_Globals globals, |
| FT_Render_Mode hint_mode ); |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * T2_Hints_FuncsRec |
| * |
| * @description: |
| * The structure used to provide the API to @T2_Hints objects. |
| * |
| * @fields: |
| * hints :: |
| * A handle to the T2 hints recorder object. |
| * |
| * open :: |
| * The function to open a recording session. |
| * |
| * close :: |
| * The function to close a recording session. |
| * |
| * stems :: |
| * The function to set the dimension's stems table. |
| * |
| * hintmask :: |
| * The function to set hint masks. |
| * |
| * counter :: |
| * The function to set counter masks. |
| * |
| * apply :: |
| * The function to apply the hints on the corresponding glyph outline. |
| * |
| */ |
| typedef struct T2_Hints_FuncsRec_ |
| { |
| T2_Hints hints; |
| T2_Hints_OpenFunc open; |
| T2_Hints_CloseFunc close; |
| T2_Hints_StemsFunc stems; |
| T2_Hints_MaskFunc hintmask; |
| T2_Hints_CounterFunc counter; |
| T2_Hints_ApplyFunc apply; |
| |
| } T2_Hints_FuncsRec; |
| |
| |
| /* */ |
| |
| |
| typedef struct PSHinter_Interface_ |
| { |
| PSH_Globals_Funcs (*get_globals_funcs)( FT_Module module ); |
| T1_Hints_Funcs (*get_t1_funcs) ( FT_Module module ); |
| T2_Hints_Funcs (*get_t2_funcs) ( FT_Module module ); |
| |
| } PSHinter_Interface; |
| |
| typedef PSHinter_Interface* PSHinter_Service; |
| |
| |
| #define FT_DEFINE_PSHINTER_INTERFACE( \ |
| class_, \ |
| get_globals_funcs_, \ |
| get_t1_funcs_, \ |
| get_t2_funcs_ ) \ |
| static const PSHinter_Interface class_ = \ |
| { \ |
| get_globals_funcs_, \ |
| get_t1_funcs_, \ |
| get_t2_funcs_ \ |
| }; |
| |
| |
| FT_END_HEADER |
| |
| #endif /* PSHINTS_H_ */ |
| |
| |
| /* END */ |
