/* * Copyright © 2011,2012 Google, Inc. * * This is part of HarfBuzz, a text shaping library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * Google Author(s): Behdad Esfahbod */ #ifndef HB_OT_OS2_TABLE_HH #define HB_OT_OS2_TABLE_HH #include "hb-open-type-private.hh" #include "hb-ot-os2-unicode-ranges.hh" namespace OT { /* * OS/2 and Windows Metrics * http://www.microsoft.com/typography/otspec/os2.htm */ #define HB_OT_TAG_os2 HB_TAG('O','S','/','2') struct os2 { static const hb_tag_t tableTag = HB_OT_TAG_os2; inline bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); return_trace (c->check_struct (this)); } inline bool subset (hb_subset_plan_t *plan) const { hb_blob_t *os2_blob = OT::Sanitizer().sanitize (hb_face_reference_table (plan->source, HB_OT_TAG_os2)); hb_blob_t *os2_prime_blob = hb_blob_create_sub_blob (os2_blob, 0, -1); // TODO(grieger): move to hb_blob_copy_writable_or_fail hb_blob_destroy (os2_blob); OT::os2 *os2_prime = (OT::os2 *) hb_blob_get_data_writable (os2_prime_blob, nullptr); if (unlikely (!os2_prime)) { hb_blob_destroy (os2_prime_blob); return false; } uint16_t min_cp, max_cp; find_min_and_max_codepoint (plan->codepoints, &min_cp, &max_cp); os2_prime->usFirstCharIndex.set (min_cp); os2_prime->usLastCharIndex.set (max_cp); _update_unicode_ranges (plan->codepoints, os2_prime->ulUnicodeRange); bool result = hb_subset_plan_add_table(plan, HB_OT_TAG_os2, os2_prime_blob); hb_blob_destroy (os2_prime_blob); return result; } inline void _update_unicode_ranges (const hb_prealloced_array_t &codepoints, HBUINT32 ulUnicodeRange[4]) const { for (unsigned int i = 0; i < 4; i++) ulUnicodeRange[i].set (0); for (unsigned int i = 0; i < codepoints.len; i++) { hb_codepoint_t cp = codepoints[i]; unsigned int bit = hb_get_unicode_range_bit (cp); if (bit < 128) { unsigned int block = bit / 32; unsigned int bit_in_block = bit % 32; unsigned int mask = 1 << bit_in_block; ulUnicodeRange[block].set (ulUnicodeRange[block] | mask); } if (cp >= 0x10000 && cp <= 0x110000) { /* the spec says that bit 57 ("Non Plane 0") implies that there's at least one codepoint beyond the BMP; so I also include all the non-BMP codepoints here */ ulUnicodeRange[1].set (ulUnicodeRange[1] | (1 << 25)); } } } static inline void find_min_and_max_codepoint (const hb_prealloced_array_t &codepoints, uint16_t *min_cp, /* OUT */ uint16_t *max_cp /* OUT */) { hb_codepoint_t min = -1, max = 0; for (unsigned int i = 0; i < codepoints.len; i++) { hb_codepoint_t cp = codepoints[i]; if (cp < min) min = cp; if (cp > max) max = cp; } if (min > 0xFFFF) min = 0xFFFF; if (max > 0xFFFF) max = 0xFFFF; *min_cp = min; *max_cp = max; } public: HBUINT16 version; /* Version 0 */ HBINT16 xAvgCharWidth; HBUINT16 usWeightClass; HBUINT16 usWidthClass; HBUINT16 fsType; HBINT16 ySubscriptXSize; HBINT16 ySubscriptYSize; HBINT16 ySubscriptXOffset; HBINT16 ySubscriptYOffset; HBINT16 ySuperscriptXSize; HBINT16 ySuperscriptYSize; HBINT16 ySuperscriptXOffset; HBINT16 ySuperscriptYOffset; HBINT16 yStrikeoutSize; HBINT16 yStrikeoutPosition; HBINT16 sFamilyClass; HBUINT8 panose[10]; HBUINT32 ulUnicodeRange[4]; Tag achVendID; HBUINT16 fsSelection; HBUINT16 usFirstCharIndex; HBUINT16 usLastCharIndex; HBINT16 sTypoAscender; HBINT16 sTypoDescender; HBINT16 sTypoLineGap; HBUINT16 usWinAscent; HBUINT16 usWinDescent; /* Version 1 */ //HBUINT32 ulCodePageRange1; //HBUINT32 ulCodePageRange2; /* Version 2 */ //HBINT16 sxHeight; //HBINT16 sCapHeight; //HBUINT16 usDefaultChar; //HBUINT16 usBreakChar; //HBUINT16 usMaxContext; /* Version 5 */ //HBUINT16 usLowerOpticalPointSize; //HBUINT16 usUpperOpticalPointSize; public: DEFINE_SIZE_STATIC (78); }; } /* namespace OT */ #endif /* HB_OT_OS2_TABLE_HH */