Michiharu Ariza
6 years ago
commit
26c291aaa0
18 changed files with 1444 additions and 912 deletions
@ -0,0 +1,416 @@ |
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/*
|
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* Copyright © 2018 Ebrahim Byagowi |
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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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#ifndef HB_AAT_LAYOUT_JUST_TABLE_HH |
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#define HB_AAT_LAYOUT_JUST_TABLE_HH |
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#include "hb-aat-layout-common.hh" |
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#include "hb-ot-layout.hh" |
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#include "hb-open-type.hh" |
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#include "hb-aat-layout-morx-table.hh" |
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/*
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* just -- Justification |
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* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6just.html
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*/ |
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#define HB_AAT_TAG_just HB_TAG('j','u','s','t') |
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namespace AAT { |
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using namespace OT; |
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struct ActionSubrecordHeader |
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{ |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (likely (c->check_struct (this))); |
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} |
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HBUINT16 actionClass; /* The JustClass value associated with this
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* ActionSubrecord. */ |
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HBUINT16 actionType; /* The type of postcompensation action. */ |
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HBUINT16 actionLength; /* Length of this ActionSubrecord record, which
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* must be a multiple of 4. */ |
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public: |
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DEFINE_SIZE_STATIC (6); |
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}; |
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struct DecompositionAction |
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{ |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (likely (c->check_struct (this))); |
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} |
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ActionSubrecordHeader |
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header; |
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Fixed lowerLimit; /* If the distance factor is less than this value,
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* then the ligature is decomposed. */ |
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Fixed upperLimit; /* If the distance factor is greater than this value,
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* then the ligature is decomposed. */ |
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HBUINT16 order; /* Numerical order in which this ligature will
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* be decomposed; you may want infrequent ligatures |
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* to decompose before more frequent ones. The ligatures |
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* on the line of text will decompose in increasing |
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* value of this field. */ |
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ArrayOf<HBUINT16> |
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decomposedglyphs; |
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/* Number of 16-bit glyph indexes that follow;
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* the ligature will be decomposed into these glyphs. |
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* |
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* Array of decomposed glyphs. */ |
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public: |
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DEFINE_SIZE_ARRAY (18, decomposedglyphs); |
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}; |
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struct UnconditionalAddGlyphAction |
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{ |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (c->check_struct (this)); |
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} |
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protected: |
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ActionSubrecordHeader |
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header; |
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GlyphID addGlyph; /* Glyph that should be added if the distance factor
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* is growing. */ |
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public: |
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DEFINE_SIZE_STATIC (8); |
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}; |
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struct ConditionalAddGlyphAction |
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{ |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (likely (c->check_struct (this))); |
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} |
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protected: |
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ActionSubrecordHeader |
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header; |
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Fixed substThreshold; /* Distance growth factor (in ems) at which
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* this glyph is replaced and the growth factor |
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* recalculated. */ |
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GlyphID addGlyph; /* Glyph to be added as kashida. If this value is
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* 0xFFFF, no extra glyph will be added. Note that |
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* generally when a glyph is added, justification |
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* will need to be redone. */ |
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GlyphID substGlyph; /* Glyph to be substituted for this glyph if the
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* growth factor equals or exceeds the value of |
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* substThreshold. */ |
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public: |
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DEFINE_SIZE_STATIC (14); |
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}; |
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struct DuctileGlyphAction |
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{ |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (likely (c->check_struct (this))); |
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} |
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protected: |
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ActionSubrecordHeader |
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header; |
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HBUINT32 variationAxis; /* The 4-byte tag identifying the ductile axis.
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* This would normally be 0x64756374 ('duct'), |
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* but you may use any axis the font contains. */ |
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Fixed minimumLimit; /* The lowest value for the ductility axis tha
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* still yields an acceptable appearance. Normally |
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* this will be 1.0. */ |
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Fixed noStretchValue; /* This is the default value that corresponds to
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* no change in appearance. Normally, this will |
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* be 1.0. */ |
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Fixed maximumLimit; /* The highest value for the ductility axis that
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* still yields an acceptable appearance. */ |
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public: |
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DEFINE_SIZE_STATIC (22); |
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}; |
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struct RepeatedAddGlyphAction |
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{ |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (likely (c->check_struct (this))); |
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} |
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protected: |
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ActionSubrecordHeader |
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header; |
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HBUINT16 flags; /* Currently unused; set to 0. */ |
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GlyphID glyph; /* Glyph that should be added if the distance factor
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* is growing. */ |
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public: |
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DEFINE_SIZE_STATIC (10); |
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}; |
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struct ActionSubrecord |
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{ |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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if (unlikely (!c->check_struct (this))) |
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return_trace (false); |
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switch (u.header.actionType) |
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{ |
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case 0: return_trace (u.decompositionAction.sanitize (c)); |
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case 1: return_trace (u.unconditionalAddGlyphAction.sanitize (c)); |
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case 2: return_trace (u.conditionalAddGlyphAction.sanitize (c)); |
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// case 3: return_trace (u.stretchGlyphAction.sanitize (c));
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case 4: return_trace (u.decompositionAction.sanitize (c)); |
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case 5: return_trace (u.decompositionAction.sanitize (c)); |
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default: return_trace (true); |
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} |
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} |
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inline unsigned int get_length () const { return u.header.actionLength; } |
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protected: |
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union { |
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ActionSubrecordHeader header; |
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DecompositionAction decompositionAction; |
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UnconditionalAddGlyphAction unconditionalAddGlyphAction; |
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ConditionalAddGlyphAction conditionalAddGlyphAction; |
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/* StretchGlyphAction stretchGlyphAction; -- Not supported by CoreText */ |
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DuctileGlyphAction ductileGlyphAction; |
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RepeatedAddGlyphAction repeatedAddGlyphAction; |
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} u; /* Data. The format of this data depends on
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* the value of the actionType field. */ |
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public: |
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DEFINE_SIZE_UNION (6, header); |
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}; |
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struct PostcompensationActionChain |
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{ |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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if (unlikely (!c->check_struct (this))) |
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return_trace (false); |
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unsigned int offset = min_size; |
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for (unsigned int i = 0; i < count; i++) |
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{ |
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const ActionSubrecord& subrecord = StructAtOffset<ActionSubrecord> (this, offset); |
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if (unlikely (!subrecord.sanitize (c))) return_trace (false); |
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offset += subrecord.get_length (); |
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} |
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return_trace (true); |
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} |
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protected: |
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HBUINT32 count; |
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public: |
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DEFINE_SIZE_STATIC (4); |
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}; |
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struct JustWidthDeltaEntry |
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{ |
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enum Flags |
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{ |
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Reserved1 =0xE000,/* Reserved. You should set these bits to zero. */ |
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UnlimiteGap =0x1000,/* The glyph can take unlimited gap. When this
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* glyph participates in the justification process, |
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* it and any other glyphs on the line having this |
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* bit set absorb all the remaining gap. */ |
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Reserved2 =0x0FF0,/* Reserved. You should set these bits to zero. */ |
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Priority =0x000F /* The justification priority of the glyph. */ |
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}; |
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enum Priority |
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{ |
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Kashida = 0, /* Kashida priority. This is the highest priority
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* during justification. */ |
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Whitespace = 1, /* Whitespace priority. Any whitespace glyphs (as
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* identified in the glyph properties table) will |
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* get this priority. */ |
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InterCharacter = 2, /* Inter-character priority. Give this to any
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* remaining glyphs. */ |
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NullPriority = 3 /* Null priority. You should set this priority for
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* glyphs that only participate in justification |
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* after the above priorities. Normally all glyphs |
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* have one of the previous three values. If you |
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* don't want a glyph to participate in justification, |
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* and you don't want to set its factors to zero, |
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* you may instead assign it to the null priority. */ |
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}; |
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protected: |
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Fixed beforeGrowLimit;/* The ratio by which the advance width of the
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* glyph is permitted to grow on the left or top side. */ |
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Fixed beforeShrinkLimit; |
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/* The ratio by which the advance width of the
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* glyph is permitted to shrink on the left or top side. */ |
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Fixed afterGrowLimit; /* The ratio by which the advance width of the glyph
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* is permitted to shrink on the left or top side. */ |
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Fixed afterShrinkLimit; |
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/* The ratio by which the advance width of the glyph
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* is at most permitted to shrink on the right or |
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* bottom side. */ |
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HBUINT16 growFlags; /* Flags controlling the grow case. */ |
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HBUINT16 shrinkFlags; /* Flags controlling the shrink case. */ |
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public: |
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DEFINE_SIZE_STATIC (20); |
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}; |
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struct WidthDeltaPair |
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{ |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (likely (c->check_struct (this))); |
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} |
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protected: |
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HBUINT32 justClass; /* The justification category associated
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* with the wdRecord field. Only 7 bits of |
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* this field are used. (The other bits are |
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* used as padding to guarantee longword |
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* alignment of the following record). */ |
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JustWidthDeltaEntry |
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wdRecord; /* The actual width delta record. */ |
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public: |
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DEFINE_SIZE_STATIC (24); |
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}; |
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struct WidthDeltaCluster : OT::LArrayOf<WidthDeltaPair> {}; |
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struct JustificationCategory |
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{ |
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typedef void EntryData; |
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enum Flags |
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{ |
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SetMark =0x8000,/* If set, make the current glyph the marked
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* glyph. */ |
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DontAdvance =0x4000,/* If set, don't advance to the next glyph before
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* going to the new state. */ |
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MarkCategory =0x3F80,/* The justification category for the marked
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* glyph if nonzero. */ |
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CurrentCategory =0x007F /* The justification category for the current
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* glyph if nonzero. */ |
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}; |
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inline bool sanitize (hb_sanitize_context_t *c, const void *base) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (likely (c->check_struct (this) && |
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morphHeader.sanitize (c) && |
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stHeader.sanitize (c))); |
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} |
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protected: |
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ChainSubtable<ObsoleteTypes> |
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morphHeader; /* Metamorphosis-style subtable header. */ |
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StateTable<ObsoleteTypes, EntryData> |
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stHeader; /* The justification insertion state table header */ |
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public: |
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DEFINE_SIZE_STATIC (30); |
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}; |
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struct JustificationHeader |
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{ |
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inline bool sanitize (hb_sanitize_context_t *c, const void *base) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (likely (c->check_struct (this) && |
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justClassTable.sanitize (c, base, base) && |
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wdcTable.sanitize (c, base) && |
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pcTable.sanitize (c, base) && |
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lookupTable.sanitize (c, base))); |
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} |
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protected: |
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OffsetTo<JustificationCategory> |
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justClassTable; /* Offset to the justification category state table. */ |
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OffsetTo<WidthDeltaCluster> |
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wdcTable; /* Offset from start of justification table to start
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* of the subtable containing the width delta factors |
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* for the glyphs in your font. |
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* |
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* The width delta clusters table. */ |
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OffsetTo<PostcompensationActionChain> |
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pcTable; /* Offset from start of justification table to start
|
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* of postcompensation subtable (set to zero if none). |
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* |
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* The postcompensation subtable, if present in the font. */ |
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Lookup<OffsetTo<WidthDeltaCluster> > |
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lookupTable; /* Lookup table associating glyphs with width delta
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* clusters. See the description of Width Delta Clusters |
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* table for details on how to interpret the lookup values. */ |
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public: |
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DEFINE_SIZE_MIN (8); |
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}; |
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struct just |
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{ |
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static const hb_tag_t tableTag = HB_AAT_TAG_just; |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (unlikely (c->check_struct (this) && |
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horizData.sanitize (c, this, this) && |
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vertData.sanitize (c, this, this))); |
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} |
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protected: |
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FixedVersion<>version; /* Version of the justification table
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* (0x00010000u for version 1.0). */ |
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HBUINT16 format; /* Format of the justification table (set to 0). */ |
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OffsetTo<JustificationHeader> |
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horizData; /* Byte offset from the start of the justification table
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* to the header for tables that contain justification |
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* information for horizontal text. |
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* If you are not including this information, |
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* store 0. */ |
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OffsetTo<JustificationHeader> |
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vertData; /* ditto, vertical */ |
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public: |
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DEFINE_SIZE_STATIC (10); |
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}; |
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} /* namespace AAT */ |
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#endif /* HB_AAT_LAYOUT_JUST_TABLE_HH */ |
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@ -0,0 +1,139 @@ |
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/*
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* Copyright © 2017 Google, 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 |
||||
* 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. |
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* |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_KERN_HH |
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#define HB_KERN_HH |
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#include "hb-open-type.hh" |
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#include "hb-aat-layout-common.hh" |
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#include "hb-ot-layout-gpos-table.hh" |
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|
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namespace OT { |
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template <typename Driver> |
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struct hb_kern_machine_t |
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{ |
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hb_kern_machine_t (const Driver &driver_, |
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bool crossStream_ = false) : |
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driver (driver_), |
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crossStream (crossStream_) {} |
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|
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HB_NO_SANITIZE_SIGNED_INTEGER_OVERFLOW |
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inline void kern (hb_font_t *font, |
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hb_buffer_t *buffer, |
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hb_mask_t kern_mask, |
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bool scale = true) const |
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{ |
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OT::hb_ot_apply_context_t c (1, font, buffer); |
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c.set_lookup_mask (kern_mask); |
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c.set_lookup_props (OT::LookupFlag::IgnoreMarks); |
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OT::hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c.iter_input; |
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skippy_iter.init (&c); |
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|
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bool horizontal = HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction); |
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unsigned int count = buffer->len; |
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hb_glyph_info_t *info = buffer->info; |
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hb_glyph_position_t *pos = buffer->pos; |
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for (unsigned int idx = 0; idx < count;) |
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{ |
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if (!(info[idx].mask & kern_mask)) |
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{ |
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idx++; |
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continue; |
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} |
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|
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skippy_iter.reset (idx, 1); |
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if (!skippy_iter.next ()) |
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{ |
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idx++; |
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continue; |
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} |
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|
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unsigned int i = idx; |
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unsigned int j = skippy_iter.idx; |
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|
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hb_position_t kern = driver.get_kerning (info[i].codepoint, |
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info[j].codepoint); |
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|
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|
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if (likely (!kern)) |
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goto skip; |
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|
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if (horizontal) |
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{ |
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if (scale) |
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kern = font->em_scale_x (kern); |
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if (crossStream) |
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{ |
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pos[j].y_offset = kern; |
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buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT; |
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} |
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else |
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{ |
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hb_position_t kern1 = kern >> 1; |
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hb_position_t kern2 = kern - kern1; |
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pos[i].x_advance += kern1; |
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pos[j].x_advance += kern2; |
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pos[j].x_offset += kern2; |
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} |
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} |
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else |
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{ |
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if (scale) |
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kern = font->em_scale_y (kern); |
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if (crossStream) |
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{ |
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pos[j].x_offset = kern; |
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buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT; |
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} |
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else |
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{ |
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hb_position_t kern1 = kern >> 1; |
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hb_position_t kern2 = kern - kern1; |
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pos[i].y_advance += kern1; |
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pos[j].y_advance += kern2; |
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pos[j].y_offset += kern2; |
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} |
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} |
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|
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buffer->unsafe_to_break (i, j + 1); |
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|
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skip: |
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idx = skippy_iter.idx; |
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} |
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} |
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|
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const Driver &driver; |
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bool crossStream; |
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}; |
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|
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|
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} /* namespace OT */ |
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|
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|
||||
#endif /* HB_KERN_HH */ |
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