/**************************************************************************** * * 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 { … }; /* * 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 { … }; /* * Constant used for hint adjustment and for synthetic em box hint * placement. */ #define CF2_MIN_COUNTER … /* shared typedef is in cf2glue.h */ struct CF2_HintRec_ { … }; CF2_BlueRec; /* max total blue zones is 12 */ enum { … }; 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 */
Codebase Browser
godot