harfbuzz/src/hb-ot-color-sbix-table.hh

154 lines
4.9 KiB
C++
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/*
* Copyright © 2018 Ebrahim Byagowi
*
* 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.
*/
#ifndef HB_OT_COLOR_SBIX_TABLE_HH
#define HB_OT_COLOR_SBIX_TABLE_HH
#include "hb-open-type-private.hh"
/*
* sbix -- Standard Bitmap Graphics
* https://docs.microsoft.com/en-us/typography/opentype/spec/sbix
* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6sbix.html
*/
#define HB_OT_TAG_sbix HB_TAG('s','b','i','x')
namespace OT {
struct SBIXGlyph
{
HBINT16 xOffset; /* The horizontal (x-axis) offset from the left
* edge of the graphic to the glyphs origin.
* That is, the x-coordinate of the point on the
* baseline at the left edge of the glyph. */
HBINT16 yOffset; /* The vertical (y-axis) offset from the bottom
* edge of the graphic to the glyphs origin.
* That is, the y-coordinate of the point on the
* baseline at the left edge of the glyph. */
Tag graphicType; /* Indicates the format of the embedded graphic
* data: one of 'jpg ', 'png ' or 'tiff', or the
* special format 'dupe'. */
UnsizedArrayOf<HBUINT8>
data; /* The actual embedded graphic data. The total
* length is inferred from sequential entries in
* the glyphDataOffsets array and the fixed size
* (8 bytes) of the preceding fields. */
public:
DEFINE_SIZE_ARRAY (8, data);
};
struct SBIXStrike
{
friend struct sbix;
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
imageOffsetsZ.sanitize_shallow (c, c->num_glyphs + 1));
}
protected:
HBUINT16 ppem; /* The PPEM size for which this strike was designed. */
HBUINT16 resolution; /* The device pixel density (in PPI) for which this
* strike was designed. (E.g., 96 PPI, 192 PPI.) */
UnsizedArrayOf<LOffsetTo<SBIXGlyph> >
imageOffsetsZ; /* Offset from the beginning of the strike data header
* to bitmap data for an individual glyph ID. */
public:
DEFINE_SIZE_STATIC (8);
};
struct sbix
{
static const hb_tag_t tableTag = HB_OT_TAG_sbix;
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) && strikes.sanitize (c, this)));
}
struct accelerator_t
{
inline void init (hb_face_t *face)
{
num_glyphs = hb_face_get_glyph_count (face);
OT::Sanitizer<OT::sbix> sanitizer;
sanitizer.set_num_glyphs (num_glyphs);
sbix_blob = sanitizer.sanitize (face->reference_table (HB_OT_TAG_sbix));
sbix_len = hb_blob_get_length (sbix_blob);
sbix_table = OT::Sanitizer<OT::sbix>::lock_instance (sbix_blob);
}
inline void fini (void)
{
hb_blob_destroy (sbix_blob);
}
inline void dump (void (*callback) (const uint8_t* data, unsigned int length,
unsigned int group, unsigned int gid)) const
{
for (unsigned group = 0; group < sbix_table->strikes.len; ++group)
{
const SBIXStrike &strike = sbix_table->strikes[group](sbix_table);
for (unsigned int glyph = 0; glyph < num_glyphs; ++glyph)
if (strike.imageOffsetsZ[glyph + 1] - strike.imageOffsetsZ[glyph] > 0)
{
const SBIXGlyph &sbixGlyph = strike.imageOffsetsZ[glyph]((const void *) &strike);
callback ((const uint8_t*) &sbixGlyph.data,
strike.imageOffsetsZ[glyph + 1] - strike.imageOffsetsZ[glyph] - 8,
group, glyph);
}
}
}
private:
hb_blob_t *sbix_blob;
const sbix *sbix_table;
unsigned int sbix_len;
unsigned int num_glyphs;
};
protected:
HBUINT16 version; /* Table version number — set to 1 */
HBUINT16 flags; /* Bit 0: Set to 1. Bit 1: Draw outlines.
* Bits 2 to 15: reserved (set to 0). */
LArrayOf<LOffsetTo<SBIXStrike> >
strikes; /* Offsets from the beginning of the 'sbix'
* table to data for each individual bitmap strike. */
public:
DEFINE_SIZE_ARRAY (8, strikes);
};
} /* namespace OT */
#endif /* HB_OT_COLOR_SBIX_TABLE_HH */