HarfBuzz text shaping engine
http://harfbuzz.github.io/
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145 lines
5.6 KiB
145 lines
5.6 KiB
/* |
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* Copyright © 2010 Red Hat, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Red Hat Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_OT_HEAD_PRIVATE_HH |
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#define HB_OT_HEAD_PRIVATE_HH |
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#include "hb-open-type-private.hh" |
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HB_BEGIN_DECLS |
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/* |
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* head |
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*/ |
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#define HB_OT_TAG_head HB_TAG('h','e','a','d') |
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struct head |
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{ |
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static const hb_tag_t Tag = HB_OT_TAG_head; |
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inline unsigned int get_upem (void) const { |
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unsigned int upem = unitsPerEm; |
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/* If no valid head table found, assume 1000, which matches typicaly Type1 usage. */ |
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return 16 <= upem && upem <= 16384 ? upem : 1000; |
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} |
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inline bool sanitize (hb_sanitize_context_t *c) { |
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TRACE_SANITIZE (); |
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return c->check_struct (this) && likely (version.major == 1); |
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} |
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private: |
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FixedVersion version; /* Version of the head table--currently |
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* 0x00010000 for version 1.0. */ |
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FixedVersion fontRevision; /* Set by font manufacturer. */ |
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ULONG checkSumAdjustment; /* To compute: set it to 0, sum the |
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* entire font as ULONG, then store |
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* 0xB1B0AFBA - sum. */ |
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ULONG magicNumber; /* Set to 0x5F0F3CF5. */ |
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USHORT flags; /* Bit 0: Baseline for font at y=0; |
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* Bit 1: Left sidebearing point at x=0; |
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* Bit 2: Instructions may depend on point size; |
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* Bit 3: Force ppem to integer values for all |
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* internal scaler math; may use fractional |
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* ppem sizes if this bit is clear; |
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* Bit 4: Instructions may alter advance width |
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* (the advance widths might not scale linearly); |
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* Bits 5-10: These should be set according to |
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* Apple's specification. However, they are not |
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* implemented in OpenType. |
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* Bit 5: This bit should be set in fonts that are |
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* intended to e laid out vertically, and in |
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* which the glyphs have been drawn such that an |
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* x-coordinate of 0 corresponds to the desired |
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* vertical baseline. |
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* Bit 6: This bit must be set to zero. |
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* Bit 7: This bit should be set if the font |
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* requires layout for correct linguistic |
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* rendering (e.g. Arabic fonts). |
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* Bit 8: This bit should be set for a GX font |
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* which has one or more metamorphosis effects |
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* designated as happening by default. |
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* Bit 9: This bit should be set if the font |
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* contains any strong right-to-left glyphs. |
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* Bit 10: This bit should be set if the font |
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* contains Indic-style rearrangement effects. |
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* Bit 11: Font data is 'lossless,' as a result |
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* of having been compressed and decompressed |
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* with the Agfa MicroType Express engine. |
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* Bit 12: Font converted (produce compatible metrics) |
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* Bit 13: Font optimized for ClearType™. |
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* Note, fonts that rely on embedded bitmaps (EBDT) |
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* for rendering should not be considered optimized |
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* for ClearType, and therefore should keep this bit |
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* cleared. |
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* Bit 14: Last Resort font. If set, indicates that |
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* the glyphs encoded in the cmap subtables are simply |
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* generic symbolic representations of code point |
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* ranges and don’t truly represent support for those |
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* code points. If unset, indicates that the glyphs |
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* encoded in the cmap subtables represent proper |
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* support for those code points. |
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* Bit 15: Reserved, set to 0. */ |
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USHORT unitsPerEm; /* Valid range is from 16 to 16384. This value |
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* should be a power of 2 for fonts that have |
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* TrueType outlines. */ |
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LONGDATETIME created; /* Number of seconds since 12:00 midnight, |
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January 1, 1904. 64-bit integer */ |
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LONGDATETIME modified; /* Number of seconds since 12:00 midnight, |
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January 1, 1904. 64-bit integer */ |
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SHORT xMin; /* For all glyph bounding boxes. */ |
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SHORT yMin; /* For all glyph bounding boxes. */ |
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SHORT xMax; /* For all glyph bounding boxes. */ |
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SHORT yMax; /* For all glyph bounding boxes. */ |
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USHORT macStyle; /* Bit 0: Bold (if set to 1); |
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* Bit 1: Italic (if set to 1) |
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* Bit 2: Underline (if set to 1) |
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* Bit 3: Outline (if set to 1) |
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* Bit 4: Shadow (if set to 1) |
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* Bit 5: Condensed (if set to 1) |
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* Bit 6: Extended (if set to 1) |
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* Bits 7-15: Reserved (set to 0). */ |
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USHORT lowestRecPPEM; /* Smallest readable size in pixels. */ |
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SHORT fontDirectionHint; /* Deprecated (Set to 2). |
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* 0: Fully mixed directional glyphs; |
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* 1: Only strongly left to right; |
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* 2: Like 1 but also contains neutrals; |
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* -1: Only strongly right to left; |
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* -2: Like -1 but also contains neutrals. */ |
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SHORT indexToLocFormat; /* 0 for short offsets, 1 for long. */ |
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SHORT glyphDataFormat; /* 0 for current format. */ |
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public: |
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DEFINE_SIZE_STATIC (54); |
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}; |
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HB_END_DECLS |
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#endif /* HB_OT_HEAD_PRIVATE_HH */
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