/***************************************************************************/ /* */ /* psblues.h */ /* */ /* Adobe's code for handling Blue Zones (specification). */ /* */ /* Copyright 2009-2013 Adobe Systems Incorporated. */ /* */ /* This software, and all works of authorship, whether in source or */ /* object code form as indicated by the copyright notice(s) included */ /* herein (collectively, the "Work") is made available, and may only be */ /* used, modified, and distributed under the FreeType Project License, */ /* LICENSE.TXT. Additionally, subject to the terms and conditions of the */ /* FreeType Project License, each contributor to the Work hereby grants */ /* to any individual or legal entity exercising permissions granted by */ /* the FreeType Project License and this section (hereafter, "You" or */ /* "Your") a perpetual, worldwide, non-exclusive, no-charge, */ /* royalty-free, irrevocable (except as stated in this section) patent */ /* license to make, have made, use, offer to sell, sell, import, and */ /* otherwise transfer the Work, where such license applies only to those */ /* patent claims licensable by such contributor that are necessarily */ /* infringed by their contribution(s) alone or by combination of their */ /* contribution(s) with the Work to which such contribution(s) was */ /* submitted. If You institute patent litigation against any entity */ /* (including a cross-claim or counterclaim in a lawsuit) alleging that */ /* the Work or a contribution incorporated within the Work constitutes */ /* direct or contributory patent infringement, then any patent licenses */ /* granted to You under this License for that Work shall terminate as of */ /* the date such litigation is filed. */ /* */ /* By using, modifying, or distributing the Work you indicate that you */ /* have read and understood the terms and conditions of the */ /* FreeType Project License as well as those provided in this section, */ /* and you accept them fully. */ /* */ /***************************************************************************/ /* * A `CF2_Blues' object stores the blue zones (horizontal alignment * zones) of a font. These are specified in the CFF private dictionary * by `BlueValues', `OtherBlues', `FamilyBlues', and `FamilyOtherBlues'. * Each zone is defined by a top and bottom edge in character space. * Further, each zone is either a top zone or a bottom zone, as recorded * by `bottomZone'. * * The maximum number of `BlueValues' and `FamilyBlues' is 7 each. * However, these are combined to produce a total of 7 zones. * Similarly, the maximum number of `OtherBlues' and `FamilyOtherBlues' * is 5 and these are combined to produce an additional 5 zones. * * Blue zones are used to `capture' hints and force them to a common * alignment point. This alignment is recorded in device space in * `dsFlatEdge'. Except for this value, a `CF2_Blues' object could be * constructed independently of scaling. Construction may occur once * the matrix is known. Other features implemented in the Capture * method are overshoot suppression, overshoot enforcement, and Blue * Boost. * * Capture is determined by `BlueValues' and `OtherBlues', but the * alignment point may be adjusted to the scaled flat edge of * `FamilyBlues' or `FamilyOtherBlues'. No alignment is done to the * curved edge of a zone. * */ #ifndef PSBLUES_H_ #define PSBLUES_H_ #include "psglue.h" FT_BEGIN_HEADER /* * `CF2_Hint' is shared by `cf2hints.h' and * `cf2blues.h', but `cf2blues.h' depends on * `cf2hints.h', so define it here. Note: The typedef is in * `cf2glue.h'. * */ enum { CF2_GhostBottom = 0x1, /* a single bottom edge */ CF2_GhostTop = 0x2, /* a single top edge */ CF2_PairBottom = 0x4, /* the bottom edge of a stem hint */ CF2_PairTop = 0x8, /* the top edge of a stem hint */ CF2_Locked = 0x10, /* this edge has been aligned */ /* by a blue zone */ CF2_Synthetic = 0x20 /* this edge was synthesized */ }; /* * Default value for OS/2 typoAscender/Descender when their difference * is not equal to `unitsPerEm'. The default is based on -250 and 1100 * in `CF2_Blues', assuming 1000 units per em here. * */ enum { CF2_ICF_Top = cf2_intToFixed( 880 ), CF2_ICF_Bottom = cf2_intToFixed( -120 ) }; /* * Constant used for hint adjustment and for synthetic em box hint * placement. */ #define CF2_MIN_COUNTER cf2_doubleToFixed( 0.5 ) /* shared typedef is in cf2glue.h */ struct CF2_HintRec_ { CF2_UInt flags; /* attributes of the edge */ size_t index; /* index in original stem hint array */ /* (if not synthetic) */ CF2_Fixed csCoord; CF2_Fixed dsCoord; CF2_Fixed scale; }; typedef struct CF2_BlueRec_ { CF2_Fixed csBottomEdge; CF2_Fixed csTopEdge; CF2_Fixed csFlatEdge; /* may be from either local or Family zones */ CF2_Fixed dsFlatEdge; /* top edge of bottom zone or bottom edge */ /* of top zone (rounded) */ FT_Bool bottomZone; } CF2_BlueRec; /* max total blue zones is 12 */ enum { CF2_MAX_BLUES = 7, CF2_MAX_OTHERBLUES = 5 }; typedef struct CF2_BluesRec_ { CF2_Fixed scale; CF2_UInt count; FT_Bool suppressOvershoot; FT_Bool doEmBoxHints; CF2_Fixed blueScale; CF2_Fixed blueShift; CF2_Fixed blueFuzz; CF2_Fixed boost; CF2_HintRec emBoxTopEdge; CF2_HintRec emBoxBottomEdge; CF2_BlueRec zone[CF2_MAX_BLUES + CF2_MAX_OTHERBLUES]; } CF2_BluesRec, *CF2_Blues; FT_LOCAL( void ) cf2_blues_init( CF2_Blues blues, CF2_Font font ); FT_LOCAL( FT_Bool ) cf2_blues_capture( const CF2_Blues blues, CF2_Hint bottomHintEdge, CF2_Hint topHintEdge ); FT_END_HEADER #endif /* PSBLUES_H_ */ /* END */