/* * Copyright © 2010 Red Hat, Inc. * Copyright © 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. * * Red Hat Author(s): Behdad Esfahbod * Google Author(s): Behdad Esfahbod */ #ifndef HB_OT_HEAD_TABLE_HH #define HB_OT_HEAD_TABLE_HH #include "hb-open-type.hh" /* * head -- Font Header * https://docs.microsoft.com/en-us/typography/opentype/spec/head */ #define HB_OT_TAG_head HB_TAG('h','e','a','d') namespace OT { struct head { friend struct OffsetTable; enum { tableTag = HB_OT_TAG_head }; unsigned int get_upem (void) const { unsigned int upem = unitsPerEm; /* If no valid head table found, assume 1000, which matches typical Type1 usage. */ return 16 <= upem && upem <= 16384 ? upem : 1000; } enum mac_style_flag_t { BOLD = 1u<<0, ITALIC = 1u<<1, UNDERLINE = 1u<<2, OUTLINE = 1u<<3, SHADOW = 1u<<4, CONDENSED = 1u<<5 }; bool is_bold (void) const { return macStyle & BOLD; } bool is_italic (void) const { return macStyle & ITALIC; } bool is_condensed (void) const { return macStyle & CONDENSED; } bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); return_trace (c->check_struct (this) && version.major == 1 && magicNumber == 0x5F0F3CF5u); } protected: FixedVersion<>version; /* Version of the head table--currently * 0x00010000u for version 1.0. */ FixedVersion<>fontRevision; /* Set by font manufacturer. */ HBUINT32 checkSumAdjustment; /* To compute: set it to 0, sum the * entire font as HBUINT32, then store * 0xB1B0AFBAu - sum. */ HBUINT32 magicNumber; /* Set to 0x5F0F3CF5u. */ HBUINT16 flags; /* Bit 0: Baseline for font at y=0; * Bit 1: Left sidebearing point at x=0; * Bit 2: Instructions may depend on point size; * Bit 3: Force ppem to integer values for all * internal scaler math; may use fractional * ppem sizes if this bit is clear; * Bit 4: Instructions may alter advance width * (the advance widths might not scale linearly); * Bits 5-10: These should be set according to * Apple's specification. However, they are not * implemented in OpenType. * Bit 5: This bit should be set in fonts that are * intended to e laid out vertically, and in * which the glyphs have been drawn such that an * x-coordinate of 0 corresponds to the desired * vertical baseline. * Bit 6: This bit must be set to zero. * Bit 7: This bit should be set if the font * requires layout for correct linguistic * rendering (e.g. Arabic fonts). * Bit 8: This bit should be set for a GX font * which has one or more metamorphosis effects * designated as happening by default. * Bit 9: This bit should be set if the font * contains any strong right-to-left glyphs. * Bit 10: This bit should be set if the font * contains Indic-style rearrangement effects. * Bit 11: Font data is 'lossless,' as a result * of having been compressed and decompressed * with the Agfa MicroType Express engine. * Bit 12: Font converted (produce compatible metrics) * Bit 13: Font optimized for ClearType™. * Note, fonts that rely on embedded bitmaps (EBDT) * for rendering should not be considered optimized * for ClearType, and therefore should keep this bit * cleared. * Bit 14: Last Resort font. If set, indicates that * the glyphs encoded in the cmap subtables are simply * generic symbolic representations of code point * ranges and don’t truly represent support for those * code points. If unset, indicates that the glyphs * encoded in the cmap subtables represent proper * support for those code points. * Bit 15: Reserved, set to 0. */ HBUINT16 unitsPerEm; /* Valid range is from 16 to 16384. This value * should be a power of 2 for fonts that have * TrueType outlines. */ LONGDATETIME created; /* Number of seconds since 12:00 midnight, January 1, 1904. 64-bit integer */ LONGDATETIME modified; /* Number of seconds since 12:00 midnight, January 1, 1904. 64-bit integer */ HBINT16 xMin; /* For all glyph bounding boxes. */ HBINT16 yMin; /* For all glyph bounding boxes. */ HBINT16 xMax; /* For all glyph bounding boxes. */ HBINT16 yMax; /* For all glyph bounding boxes. */ HBUINT16 macStyle; /* Bit 0: Bold (if set to 1); * Bit 1: Italic (if set to 1) * Bit 2: Underline (if set to 1) * Bit 3: Outline (if set to 1) * Bit 4: Shadow (if set to 1) * Bit 5: Condensed (if set to 1) * Bit 6: Extended (if set to 1) * Bits 7-15: Reserved (set to 0). */ HBUINT16 lowestRecPPEM; /* Smallest readable size in pixels. */ HBINT16 fontDirectionHint; /* Deprecated (Set to 2). * 0: Fully mixed directional glyphs; * 1: Only strongly left to right; * 2: Like 1 but also contains neutrals; * -1: Only strongly right to left; * -2: Like -1 but also contains neutrals. */ public: HBUINT16 indexToLocFormat; /* 0 for short offsets, 1 for long. */ HBUINT16 glyphDataFormat; /* 0 for current format. */ DEFINE_SIZE_STATIC (54); }; } /* namespace OT */ #endif /* HB_OT_HEAD_TABLE_HH */