| /***************************************************************************/ |
| /* */ |
| /* aftypes.h */ |
| /* */ |
| /* Auto-fitter types (specification only). */ |
| /* */ |
| /* Copyright 2003-2009, 2011 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. */ |
| /* */ |
| /***************************************************************************/ |
| |
| |
| /************************************************************************* |
| * |
| * The auto-fitter is a complete rewrite of the old auto-hinter. |
| * Its main feature is the ability to differentiate between different |
| * scripts in order to apply language-specific rules. |
| * |
| * The code has also been compartmentized into several entities that |
| * should make algorithmic experimentation easier than with the old |
| * code. |
| * |
| * Finally, we get rid of the Catharon license, since this code is |
| * released under the FreeType one. |
| * |
| *************************************************************************/ |
| |
| |
| #ifndef __AFTYPES_H__ |
| #define __AFTYPES_H__ |
| |
| #include <ft2build.h> |
| |
| #include FT_FREETYPE_H |
| #include FT_OUTLINE_H |
| #include FT_INTERNAL_OBJECTS_H |
| #include FT_INTERNAL_DEBUG_H |
| |
| |
| FT_BEGIN_HEADER |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** D E B U G G I N G *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| #ifdef FT_DEBUG_AUTOFIT |
| |
| #include FT_CONFIG_STANDARD_LIBRARY_H |
| |
| extern int _af_debug_disable_horz_hints; |
| extern int _af_debug_disable_vert_hints; |
| extern int _af_debug_disable_blue_hints; |
| extern void* _af_debug_hints; |
| |
| #endif /* FT_DEBUG_AUTOFIT */ |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** U T I L I T Y S T U F F *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| typedef struct AF_WidthRec_ |
| { |
| FT_Pos org; /* original position/width in font units */ |
| FT_Pos cur; /* current/scaled position/width in device sub-pixels */ |
| FT_Pos fit; /* current/fitted position/width in device sub-pixels */ |
| |
| } AF_WidthRec, *AF_Width; |
| |
| |
| FT_LOCAL( void ) |
| af_sort_pos( FT_UInt count, |
| FT_Pos* table ); |
| |
| FT_LOCAL( void ) |
| af_sort_widths( FT_UInt count, |
| AF_Width widths ); |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** A N G L E T Y P E S *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* |
| * The auto-fitter doesn't need a very high angular accuracy; |
| * this allows us to speed up some computations considerably with a |
| * light Cordic algorithm (see afangles.c). |
| */ |
| |
| typedef FT_Int AF_Angle; |
| |
| |
| #define AF_ANGLE_PI 256 |
| #define AF_ANGLE_2PI ( AF_ANGLE_PI * 2 ) |
| #define AF_ANGLE_PI2 ( AF_ANGLE_PI / 2 ) |
| #define AF_ANGLE_PI4 ( AF_ANGLE_PI / 4 ) |
| |
| |
| #if 0 |
| /* |
| * compute the angle of a given 2-D vector |
| */ |
| FT_LOCAL( AF_Angle ) |
| af_angle_atan( FT_Pos dx, |
| FT_Pos dy ); |
| |
| |
| /* |
| * compute `angle2 - angle1'; the result is always within |
| * the range [-AF_ANGLE_PI .. AF_ANGLE_PI - 1] |
| */ |
| FT_LOCAL( AF_Angle ) |
| af_angle_diff( AF_Angle angle1, |
| AF_Angle angle2 ); |
| #endif /* 0 */ |
| |
| |
| #define AF_ANGLE_DIFF( result, angle1, angle2 ) \ |
| FT_BEGIN_STMNT \ |
| AF_Angle _delta = (angle2) - (angle1); \ |
| \ |
| \ |
| _delta %= AF_ANGLE_2PI; \ |
| if ( _delta < 0 ) \ |
| _delta += AF_ANGLE_2PI; \ |
| \ |
| if ( _delta > AF_ANGLE_PI ) \ |
| _delta -= AF_ANGLE_2PI; \ |
| \ |
| result = _delta; \ |
| FT_END_STMNT |
| |
| |
| /* opaque handle to glyph-specific hints -- see `afhints.h' for more |
| * details |
| */ |
| typedef struct AF_GlyphHintsRec_* AF_GlyphHints; |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** S C A L E R S *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* |
| * A scaler models the target pixel device that will receive the |
| * auto-hinted glyph image. |
| */ |
| |
| typedef enum AF_ScalerFlags_ |
| { |
| AF_SCALER_FLAG_NO_HORIZONTAL = 1, /* disable horizontal hinting */ |
| AF_SCALER_FLAG_NO_VERTICAL = 2, /* disable vertical hinting */ |
| AF_SCALER_FLAG_NO_ADVANCE = 4 /* disable advance hinting */ |
| |
| } AF_ScalerFlags; |
| |
| |
| typedef struct AF_ScalerRec_ |
| { |
| FT_Face face; /* source font face */ |
| FT_Fixed x_scale; /* from font units to 1/64th device pixels */ |
| FT_Fixed y_scale; /* from font units to 1/64th device pixels */ |
| FT_Pos x_delta; /* in 1/64th device pixels */ |
| FT_Pos y_delta; /* in 1/64th device pixels */ |
| FT_Render_Mode render_mode; /* monochrome, anti-aliased, LCD, etc. */ |
| FT_UInt32 flags; /* additional control flags, see above */ |
| |
| } AF_ScalerRec, *AF_Scaler; |
| |
| |
| #define AF_SCALER_EQUAL_SCALES( a, b ) \ |
| ( (a)->x_scale == (b)->x_scale && \ |
| (a)->y_scale == (b)->y_scale && \ |
| (a)->x_delta == (b)->x_delta && \ |
| (a)->y_delta == (b)->y_delta ) |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** S C R I P T S *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* |
| * The list of known scripts. Each different script corresponds to the |
| * following information: |
| * |
| * - A set of Unicode ranges to test whether the face supports the |
| * script. |
| * |
| * - A specific global analyzer that will compute global metrics |
| * specific to the script. |
| * |
| * - A specific glyph analyzer that will compute segments and |
| * edges for each glyph covered by the script. |
| * |
| * - A specific grid-fitting algorithm that will distort the |
| * scaled glyph outline according to the results of the glyph |
| * analyzer. |
| * |
| * Note that a given analyzer and/or grid-fitting algorithm can be |
| * used by more than one script. |
| */ |
| |
| typedef enum AF_Script_ |
| { |
| AF_SCRIPT_NONE = 0, |
| AF_SCRIPT_LATIN = 1, |
| AF_SCRIPT_CJK = 2, |
| AF_SCRIPT_INDIC = 3, |
| #ifdef FT_OPTION_AUTOFIT2 |
| AF_SCRIPT_LATIN2, |
| #endif |
| |
| /* add new scripts here. Don't forget to update the list in */ |
| /* `afglobal.c'. */ |
| |
| AF_SCRIPT_MAX /* do not remove */ |
| |
| } AF_Script; |
| |
| |
| typedef struct AF_ScriptClassRec_ const* AF_ScriptClass; |
| |
| typedef struct AF_ScriptMetricsRec_ |
| { |
| AF_ScriptClass clazz; |
| AF_ScalerRec scaler; |
| FT_Bool digits_have_same_width; |
| |
| } AF_ScriptMetricsRec, *AF_ScriptMetrics; |
| |
| |
| /* This function parses an FT_Face to compute global metrics for |
| * a specific script. |
| */ |
| typedef FT_Error |
| (*AF_Script_InitMetricsFunc)( AF_ScriptMetrics metrics, |
| FT_Face face ); |
| |
| typedef void |
| (*AF_Script_ScaleMetricsFunc)( AF_ScriptMetrics metrics, |
| AF_Scaler scaler ); |
| |
| typedef void |
| (*AF_Script_DoneMetricsFunc)( AF_ScriptMetrics metrics ); |
| |
| |
| typedef FT_Error |
| (*AF_Script_InitHintsFunc)( AF_GlyphHints hints, |
| AF_ScriptMetrics metrics ); |
| |
| typedef void |
| (*AF_Script_ApplyHintsFunc)( AF_GlyphHints hints, |
| FT_Outline* outline, |
| AF_ScriptMetrics metrics ); |
| |
| |
| typedef struct AF_Script_UniRangeRec_ |
| { |
| FT_UInt32 first; |
| FT_UInt32 last; |
| |
| } AF_Script_UniRangeRec; |
| |
| #define AF_UNIRANGE_REC( a, b ) { (FT_UInt32)(a), (FT_UInt32)(b) } |
| |
| typedef const AF_Script_UniRangeRec *AF_Script_UniRange; |
| |
| |
| typedef struct AF_ScriptClassRec_ |
| { |
| AF_Script script; |
| AF_Script_UniRange script_uni_ranges; /* last must be { 0, 0 } */ |
| |
| FT_Offset script_metrics_size; |
| AF_Script_InitMetricsFunc script_metrics_init; |
| AF_Script_ScaleMetricsFunc script_metrics_scale; |
| AF_Script_DoneMetricsFunc script_metrics_done; |
| |
| AF_Script_InitHintsFunc script_hints_init; |
| AF_Script_ApplyHintsFunc script_hints_apply; |
| |
| } AF_ScriptClassRec; |
| |
| |
| /* Declare and define vtables for classes */ |
| #ifndef FT_CONFIG_OPTION_PIC |
| |
| #define AF_DECLARE_SCRIPT_CLASS( script_class ) \ |
| FT_CALLBACK_TABLE const AF_ScriptClassRec \ |
| script_class; |
| |
| #define AF_DEFINE_SCRIPT_CLASS( script_class, script_, ranges, m_size, \ |
| m_init, m_scale, m_done, h_init, h_apply ) \ |
| FT_CALLBACK_TABLE_DEF const AF_ScriptClassRec \ |
| script_class = \ |
| { \ |
| script_, \ |
| ranges, \ |
| \ |
| m_size, \ |
| \ |
| m_init, \ |
| m_scale, \ |
| m_done, \ |
| \ |
| h_init, \ |
| h_apply \ |
| }; |
| |
| #else /* FT_CONFIG_OPTION_PIC */ |
| |
| #define AF_DECLARE_SCRIPT_CLASS( script_class ) \ |
| FT_LOCAL( void ) \ |
| FT_Init_Class_##script_class( AF_ScriptClassRec* ac ); |
| |
| #define AF_DEFINE_SCRIPT_CLASS( script_class, script_, ranges, m_size, \ |
| m_init, m_scale, m_done, h_init, h_apply ) \ |
| FT_LOCAL_DEF( void ) \ |
| FT_Init_Class_##script_class( AF_ScriptClassRec* ac ) \ |
| { \ |
| ac->script = script_; \ |
| ac->script_uni_ranges = ranges; \ |
| \ |
| ac->script_metrics_size = m_size; \ |
| \ |
| ac->script_metrics_init = m_init; \ |
| ac->script_metrics_scale = m_scale; \ |
| ac->script_metrics_done = m_done; \ |
| \ |
| ac->script_hints_init = h_init; \ |
| ac->script_hints_apply = h_apply; \ |
| } |
| |
| #endif /* FT_CONFIG_OPTION_PIC */ |
| |
| |
| /* */ |
| |
| FT_END_HEADER |
| |
| #endif /* __AFTYPES_H__ */ |
| |
| |
| /* END */ |
