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+/*
+ * Copyright © 2011,2012 Google, Inc.
+ * Copyright © 2018 Ebrahim Byagowi
+ *
+ * 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.hh"
+#include "hb-ot-os2-unicode-ranges.hh"
+#include "hb-ot-var-mvar-table.hh"
+
+#include "hb-set.hh"
+
+/*
+ * OS/2 and Windows Metrics
+ * https://docs.microsoft.com/en-us/typography/opentype/spec/os2
+ */
+#define HB_OT_TAG_OS2 HB_TAG('O','S','/','2')
+
+
+namespace OT {
+
+struct OS2V1Tail
+{
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ public:
+ HBUINT32 ulCodePageRange1;
+ HBUINT32 ulCodePageRange2;
+ public:
+ DEFINE_SIZE_STATIC (8);
+};
+
+struct OS2V2Tail
+{
+ bool has_data () const { return sxHeight || sCapHeight; }
+
+ const OS2V2Tail * operator -> () const { return this; }
+ OS2V2Tail * operator -> () { return this; }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ public:
+ HBINT16 sxHeight;
+ HBINT16 sCapHeight;
+ HBUINT16 usDefaultChar;
+ HBUINT16 usBreakChar;
+ HBUINT16 usMaxContext;
+ public:
+ DEFINE_SIZE_STATIC (10);
+};
+
+struct OS2V5Tail
+{
+ inline bool get_optical_size (unsigned int *lower, unsigned int *upper) const
+ {
+ unsigned int lower_optical_size = usLowerOpticalPointSize;
+ unsigned int upper_optical_size = usUpperOpticalPointSize;
+
+ /* Per https://docs.microsoft.com/en-us/typography/opentype/spec/os2#lps */
+ if (lower_optical_size < upper_optical_size &&
+ lower_optical_size >= 1 && lower_optical_size <= 0xFFFE &&
+ upper_optical_size >= 2 && upper_optical_size <= 0xFFFF)
+ {
+ *lower = lower_optical_size;
+ *upper = upper_optical_size;
+ return true;
+ }
+ return false;
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ public:
+ HBUINT16 usLowerOpticalPointSize;
+ HBUINT16 usUpperOpticalPointSize;
+ public:
+ DEFINE_SIZE_STATIC (4);
+};
+
+struct OS2
+{
+ static constexpr hb_tag_t tableTag = HB_OT_TAG_OS2;
+
+ bool has_data () const { return usWeightClass || usWidthClass || usFirstCharIndex || usLastCharIndex; }
+
+ const OS2V1Tail &v1 () const { return version >= 1 ? v1X : Null (OS2V1Tail); }
+ const OS2V2Tail &v2 () const { return version >= 2 ? v2X : Null (OS2V2Tail); }
+ const OS2V5Tail &v5 () const { return version >= 5 ? v5X : Null (OS2V5Tail); }
+
+ enum selection_flag_t {
+ ITALIC = 1u<<0,
+ UNDERSCORE = 1u<<1,
+ NEGATIVE = 1u<<2,
+ OUTLINED = 1u<<3,
+ STRIKEOUT = 1u<<4,
+ BOLD = 1u<<5,
+ REGULAR = 1u<<6,
+ USE_TYPO_METRICS = 1u<<7,
+ WWS = 1u<<8,
+ OBLIQUE = 1u<<9
+ };
+
+ bool is_italic () const { return fsSelection & ITALIC; }
+ bool is_oblique () const { return fsSelection & OBLIQUE; }
+ bool use_typo_metrics () const { return fsSelection & USE_TYPO_METRICS; }
+
+ enum width_class_t {
+ FWIDTH_ULTRA_CONDENSED = 1, /* 50% */
+ FWIDTH_EXTRA_CONDENSED = 2, /* 62.5% */
+ FWIDTH_CONDENSED = 3, /* 75% */
+ FWIDTH_SEMI_CONDENSED = 4, /* 87.5% */
+ FWIDTH_NORMAL = 5, /* 100% */
+ FWIDTH_SEMI_EXPANDED = 6, /* 112.5% */
+ FWIDTH_EXPANDED = 7, /* 125% */
+ FWIDTH_EXTRA_EXPANDED = 8, /* 150% */
+ FWIDTH_ULTRA_EXPANDED = 9 /* 200% */
+ };
+
+ float get_width () const
+ {
+ switch (usWidthClass) {
+ case FWIDTH_ULTRA_CONDENSED:return 50.f;
+ case FWIDTH_EXTRA_CONDENSED:return 62.5f;
+ case FWIDTH_CONDENSED: return 75.f;
+ case FWIDTH_SEMI_CONDENSED: return 87.5f;
+ default:
+ case FWIDTH_NORMAL: return 100.f;
+ case FWIDTH_SEMI_EXPANDED: return 112.5f;
+ case FWIDTH_EXPANDED: return 125.f;
+ case FWIDTH_EXTRA_EXPANDED: return 150.f;
+ case FWIDTH_ULTRA_EXPANDED: return 200.f;
+ }
+ }
+
+ float map_wdth_to_widthclass(float width) const
+ {
+ if (width < 50) return 1.0f;
+ if (width > 200) return 9.0f;
+
+ float ratio = (width - 50) / 12.5f;
+ int a = (int) floorf (ratio);
+ int b = (int) ceilf (ratio);
+
+ /* follow this maping:
+ * https://docs.microsoft.com/en-us/typography/opentype/spec/os2#uswidthclass
+ */
+ if (b <= 6) // 50-125
+ {
+ if (a == b) return a + 1.0f;
+ }
+ else if (b == 7) // no mapping for 137.5
+ {
+ a = 6;
+ b = 8;
+ }
+ else if (b == 8)
+ {
+ if (a == b) return 8.0f; // 150
+ a = 6;
+ }
+ else
+ {
+ if (a == b && a == 12) return 9.0f; //200
+ b = 12;
+ a = 8;
+ }
+
+ float va = 50 + a * 12.5f;
+ float vb = 50 + b * 12.5f;
+
+ float ret = a + (width - va) / (vb - va);
+ if (a <= 6) ret += 1.0f;
+ return ret;
+ }
+
+ static unsigned calc_avg_char_width (const hb_hashmap_t<hb_codepoint_t, hb_pair_t<unsigned, int>>& hmtx_map)
+ {
+ unsigned num = 0;
+ unsigned total_width = 0;
+ for (const auto& _ : hmtx_map.values_ref ())
+ {
+ unsigned width = _.first;
+ if (width)
+ {
+ total_width += width;
+ num++;
+ }
+ }
+
+ return num ? (unsigned) roundf (total_width / num) : 0;
+ }
+
+ bool subset (hb_subset_context_t *c) const
+ {
+ TRACE_SUBSET (this);
+ OS2 *os2_prime = c->serializer->embed (this);
+ if (unlikely (!os2_prime)) return_trace (false);
+
+#ifndef HB_NO_VAR
+ if (c->plan->normalized_coords)
+ {
+ auto &MVAR = *c->plan->source->table.MVAR;
+ auto *table = os2_prime;
+
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER, sTypoAscender);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER, sTypoDescender);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP, sTypoLineGap);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT, usWinAscent);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT, usWinDescent);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_SIZE, ySubscriptXSize);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_SIZE, ySubscriptYSize);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_OFFSET, ySubscriptXOffset);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_OFFSET, ySubscriptYOffset);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_SIZE, ySuperscriptXSize);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_SIZE, ySuperscriptYSize);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_OFFSET, ySuperscriptXOffset);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_OFFSET, ySuperscriptYOffset);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_STRIKEOUT_SIZE, yStrikeoutSize);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_STRIKEOUT_OFFSET, yStrikeoutPosition);
+
+ if (os2_prime->version >= 2)
+ {
+ hb_barrier ();
+ auto *table = & const_cast<OS2V2Tail &> (os2_prime->v2 ());
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_X_HEIGHT, sxHeight);
+ HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_CAP_HEIGHT, sCapHeight);
+ }
+
+ unsigned avg_char_width = calc_avg_char_width (c->plan->hmtx_map);
+ if (!c->serializer->check_assign (os2_prime->xAvgCharWidth, avg_char_width,
+ HB_SERIALIZE_ERROR_INT_OVERFLOW))
+ return_trace (false);
+ }
+#endif
+
+ Triple *axis_range;
+ if (c->plan->user_axes_location.has (HB_TAG ('w','g','h','t'), &axis_range))
+ {
+ unsigned weight_class = static_cast<unsigned> (roundf (hb_clamp (axis_range->middle, 1.0f, 1000.0f)));
+ if (os2_prime->usWeightClass != weight_class)
+ os2_prime->usWeightClass = weight_class;
+ }
+
+ if (c->plan->user_axes_location.has (HB_TAG ('w','d','t','h'), &axis_range))
+ {
+ unsigned width_class = static_cast<unsigned> (roundf (map_wdth_to_widthclass (axis_range->middle)));
+ if (os2_prime->usWidthClass != width_class)
+ os2_prime->usWidthClass = width_class;
+ }
+
+ if (c->plan->flags & HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES)
+ return_trace (true);
+
+ os2_prime->usFirstCharIndex = hb_min (0xFFFFu, c->plan->unicodes.get_min ());
+ os2_prime->usLastCharIndex = hb_min (0xFFFFu, c->plan->unicodes.get_max ());
+
+ _update_unicode_ranges (&c->plan->unicodes, os2_prime->ulUnicodeRange);
+
+ return_trace (true);
+ }
+
+ void _update_unicode_ranges (const hb_set_t *codepoints,
+ HBUINT32 ulUnicodeRange[4]) const
+ {
+ HBUINT32 newBits[4];
+ for (unsigned int i = 0; i < 4; i++)
+ newBits[i] = 0;
+
+ /* This block doesn't show up in profiles. If it ever did,
+ * we can rewrite it to iterate over OS/2 ranges and use
+ * set iteration to check if the range matches. */
+ for (auto cp : *codepoints)
+ {
+ unsigned int bit = _hb_ot_os2_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;
+ newBits[block] = newBits[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 */
+ newBits[1] = newBits[1] | (1 << 25);
+ }
+ }
+
+ for (unsigned int i = 0; i < 4; i++)
+ ulUnicodeRange[i] = ulUnicodeRange[i] & newBits[i]; // set bits only if set in the original
+ }
+
+ /* https://github.com/Microsoft/Font-Validator/blob/520aaae/OTFontFileVal/val_OS2.cs#L644-L681
+ * https://docs.microsoft.com/en-us/typography/legacy/legacy_arabic_fonts */
+ enum font_page_t
+ {
+ FONT_PAGE_NONE = 0,
+ FONT_PAGE_HEBREW = 0xB100, /* Hebrew Windows 3.1 font page */
+ FONT_PAGE_SIMP_ARABIC = 0xB200, /* Simplified Arabic Windows 3.1 font page */
+ FONT_PAGE_TRAD_ARABIC = 0xB300, /* Traditional Arabic Windows 3.1 font page */
+ FONT_PAGE_OEM_ARABIC = 0xB400, /* OEM Arabic Windows 3.1 font page */
+ FONT_PAGE_SIMP_FARSI = 0xBA00, /* Simplified Farsi Windows 3.1 font page */
+ FONT_PAGE_TRAD_FARSI = 0xBB00, /* Traditional Farsi Windows 3.1 font page */
+ FONT_PAGE_THAI = 0xDE00 /* Thai Windows 3.1 font page */
+ };
+ font_page_t get_font_page () const
+ { return (font_page_t) (version == 0 ? fsSelection & 0xFF00 : 0); }
+
+ unsigned get_size () const
+ {
+ unsigned result = min_size;
+ if (version >= 1) result += v1X.get_size ();
+ if (version >= 2) result += v2X.get_size ();
+ if (version >= 5) result += v5X.get_size ();
+ return result;
+ }
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ if (unlikely (!c->check_struct (this))) return_trace (false);
+ hb_barrier ();
+ if (unlikely (version >= 1 && !v1X.sanitize (c))) return_trace (false);
+ if (unlikely (version >= 2 && !v2X.sanitize (c))) return_trace (false);
+ if (unlikely (version >= 5 && !v5X.sanitize (c))) return_trace (false);
+ return_trace (true);
+ }
+
+ public:
+ HBUINT16 version;
+ 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;
+ OS2V1Tail v1X;
+ OS2V2Tail v2X;
+ OS2V5Tail v5X;
+ public:
+ DEFINE_SIZE_MIN (78);
+};
+
+} /* namespace OT */
+
+
+#endif /* HB_OT_OS2_TABLE_HH */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-01 17:23:14 +0000