148 lines
4.7 KiB
C++
148 lines
4.7 KiB
C++
/*
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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_OT_COLOR_SBIX_TABLE_HH
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#define HB_OT_COLOR_SBIX_TABLE_HH
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#include "hb-open-type.hh"
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/*
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* sbix -- Standard Bitmap Graphics
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* https://docs.microsoft.com/en-us/typography/opentype/spec/sbix
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* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6sbix.html
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*/
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#define HB_OT_TAG_sbix HB_TAG('s','b','i','x')
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namespace OT {
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struct SBIXGlyph
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{
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HBINT16 xOffset; /* The horizontal (x-axis) offset from the left
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* edge of the graphic to the glyph’s origin.
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* That is, the x-coordinate of the point on the
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* baseline at the left edge of the glyph. */
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HBINT16 yOffset; /* The vertical (y-axis) offset from the bottom
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* edge of the graphic to the glyph’s origin.
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* That is, the y-coordinate of the point on the
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* baseline at the left edge of the glyph. */
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Tag graphicType; /* Indicates the format of the embedded graphic
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* data: one of 'jpg ', 'png ' or 'tiff', or the
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* special format 'dupe'. */
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UnsizedArrayOf<HBUINT8>
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data; /* The actual embedded graphic data. The total
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* length is inferred from sequential entries in
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* the glyphDataOffsets array and the fixed size
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* (8 bytes) of the preceding fields. */
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public:
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DEFINE_SIZE_ARRAY (8, data);
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};
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struct SBIXStrike
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{
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friend struct sbix;
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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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imageOffsetsZ.sanitize_shallow (c, c->get_num_glyphs () + 1));
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}
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protected:
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HBUINT16 ppem; /* The PPEM size for which this strike was designed. */
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HBUINT16 resolution; /* The device pixel density (in PPI) for which this
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* strike was designed. (E.g., 96 PPI, 192 PPI.) */
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UnsizedArrayOf<LOffsetTo<SBIXGlyph> >
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imageOffsetsZ; /* Offset from the beginning of the strike data header
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* to bitmap data for an individual glyph ID. */
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public:
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DEFINE_SIZE_STATIC (8);
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};
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struct sbix
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{
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static const hb_tag_t tableTag = HB_OT_TAG_sbix;
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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) && strikes.sanitize (c, this)));
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}
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struct accelerator_t
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{
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inline void init (hb_face_t *face)
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{
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sbix_blob = hb_sanitize_context_t().reference_table<sbix> (face);
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sbix_len = hb_blob_get_length (sbix_blob);
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sbix_table = sbix_blob->as<sbix> ();
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}
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inline void fini (void)
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{
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hb_blob_destroy (sbix_blob);
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}
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inline void dump (void (*callback) (const uint8_t* data, unsigned int length,
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unsigned int group, unsigned int gid)) const
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{
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for (unsigned group = 0; group < sbix_table->strikes.len; ++group)
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{
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const SBIXStrike &strike = sbix_table->strikes[group](sbix_table);
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for (unsigned int glyph = 0; glyph < num_glyphs; ++glyph)
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if (strike.imageOffsetsZ[glyph + 1] - strike.imageOffsetsZ[glyph] > 0)
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{
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const SBIXGlyph &sbixGlyph = strike.imageOffsetsZ[glyph]((const void *) &strike);
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callback ((const uint8_t*) &sbixGlyph.data,
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strike.imageOffsetsZ[glyph + 1] - strike.imageOffsetsZ[glyph] - 8,
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group, glyph);
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}
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}
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}
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private:
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hb_blob_t *sbix_blob;
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const sbix *sbix_table;
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unsigned int sbix_len;
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unsigned int num_glyphs;
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};
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protected:
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HBUINT16 version; /* Table version number — set to 1 */
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HBUINT16 flags; /* Bit 0: Set to 1. Bit 1: Draw outlines.
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* Bits 2 to 15: reserved (set to 0). */
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LArrayOf<LOffsetTo<SBIXStrike> >
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strikes; /* Offsets from the beginning of the 'sbix'
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* table to data for each individual bitmap strike. */
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public:
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DEFINE_SIZE_ARRAY (8, strikes);
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};
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} /* namespace OT */
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#endif /* HB_OT_COLOR_SBIX_TABLE_HH */
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