| /* |
| * 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 OpenTypeOffsetTable; |
| |
| static constexpr hb_tag_t tableTag = HB_OT_TAG_head; |
| |
| unsigned int get_upem () 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; |
| } |
| |
| bool serialize (hb_serialize_context_t *c) const |
| { |
| TRACE_SERIALIZE (this); |
| return_trace ((bool) c->embed (this)); |
| } |
| |
| bool subset (hb_subset_context_t *c) const |
| { |
| TRACE_SUBSET (this); |
| head *out = c->serializer->embed (this); |
| if (unlikely (!out)) return_trace (false); |
| |
| if (c->plan->normalized_coords) |
| { |
| if (unlikely (!c->serializer->check_assign (out->xMin, c->plan->head_maxp_info.xMin, |
| HB_SERIALIZE_ERROR_INT_OVERFLOW))) |
| return_trace (false); |
| if (unlikely (!c->serializer->check_assign (out->xMax, c->plan->head_maxp_info.xMax, |
| HB_SERIALIZE_ERROR_INT_OVERFLOW))) |
| return_trace (false); |
| if (unlikely (!c->serializer->check_assign (out->yMin, c->plan->head_maxp_info.yMin, |
| HB_SERIALIZE_ERROR_INT_OVERFLOW))) |
| return_trace (false); |
| if (unlikely (!c->serializer->check_assign (out->yMax, c->plan->head_maxp_info.yMax, |
| HB_SERIALIZE_ERROR_INT_OVERFLOW))) |
| return_trace (false); |
| } |
| return_trace (true); |
| } |
| |
| enum mac_style_flag_t { |
| BOLD = 1u<<0, |
| ITALIC = 1u<<1, |
| UNDERLINE = 1u<<2, |
| OUTLINE = 1u<<3, |
| SHADOW = 1u<<4, |
| CONDENSED = 1u<<5, |
| EXPANDED = 1u<<6, |
| }; |
| |
| bool is_bold () const { return macStyle & BOLD; } |
| bool is_italic () const { return macStyle & ITALIC; } |
| bool is_condensed () const { return macStyle & CONDENSED; } |
| bool is_expanded () const { return macStyle & EXPANDED; } |
| |
| 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. */ |
| public: |
| 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. */ |
| protected: |
| 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 */ |
| public: |
| 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. */ |
| protected: |
| 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 */ |
