194 lines
6.4 KiB
C++
194 lines
6.4 KiB
C++
/*
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* Copyright © 2016 Google, Inc.
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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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* Google Author(s): Sascha Brawer
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*/
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#ifndef HB_OT_COLOR_CPAL_TABLE_HH
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#define HB_OT_COLOR_CPAL_TABLE_HH
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#include "hb-open-type.hh"
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#include "hb-ot-color.h"
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#include "hb-ot-name.h"
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/*
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* CPAL -- Color Palette
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* https://docs.microsoft.com/en-us/typography/opentype/spec/cpal
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*/
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#define HB_OT_TAG_CPAL HB_TAG('C','P','A','L')
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namespace OT {
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struct CPALV1Tail
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{
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friend struct CPAL;
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private:
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hb_ot_color_palette_flags_t get_palette_flags (const void *base,
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unsigned int palette_index,
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unsigned int palette_count) const
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{
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if (!paletteFlagsZ) return HB_OT_COLOR_PALETTE_FLAG_DEFAULT;
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return (hb_ot_color_palette_flags_t) (uint32_t)
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(base+paletteFlagsZ).as_array (palette_count)[palette_index];
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}
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hb_ot_name_id_t get_palette_name_id (const void *base,
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unsigned int palette_index,
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unsigned int palette_count) const
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{
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if (!paletteLabelsZ) return HB_OT_NAME_ID_INVALID;
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return (base+paletteLabelsZ).as_array (palette_count)[palette_index];
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}
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hb_ot_name_id_t get_color_name_id (const void *base,
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unsigned int color_index,
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unsigned int color_count) const
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{
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if (!colorLabelsZ) return HB_OT_NAME_ID_INVALID;
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return (base+colorLabelsZ).as_array (color_count)[color_index];
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}
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public:
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bool sanitize (hb_sanitize_context_t *c,
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const void *base,
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unsigned int palette_count,
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unsigned int color_count) 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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(!paletteFlagsZ || (base+paletteFlagsZ).sanitize (c, palette_count)) &&
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(!paletteLabelsZ || (base+paletteLabelsZ).sanitize (c, palette_count)) &&
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(!colorLabelsZ || (base+colorLabelsZ).sanitize (c, color_count)));
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}
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protected:
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LNNOffsetTo<UnsizedArrayOf<HBUINT32>>
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paletteFlagsZ; /* Offset from the beginning of CPAL table to
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* the Palette Type Array. Set to 0 if no array
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* is provided. */
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LNNOffsetTo<UnsizedArrayOf<NameID>>
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paletteLabelsZ; /* Offset from the beginning of CPAL table to
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* the palette labels array. Set to 0 if no
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* array is provided. */
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LNNOffsetTo<UnsizedArrayOf<NameID>>
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colorLabelsZ; /* Offset from the beginning of CPAL table to
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* the color labels array. Set to 0
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* if no array is provided. */
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public:
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DEFINE_SIZE_STATIC (12);
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};
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typedef HBUINT32 BGRAColor;
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struct CPAL
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{
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static constexpr hb_tag_t tableTag = HB_OT_TAG_CPAL;
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bool has_data () const { return numPalettes; }
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unsigned int get_size () const
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{ return min_size + numPalettes * sizeof (colorRecordIndicesZ[0]); }
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unsigned int get_palette_count () const { return numPalettes; }
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unsigned int get_color_count () const { return numColors; }
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hb_ot_color_palette_flags_t get_palette_flags (unsigned int palette_index) const
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{ return v1 ().get_palette_flags (this, palette_index, numPalettes); }
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hb_ot_name_id_t get_palette_name_id (unsigned int palette_index) const
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{ return v1 ().get_palette_name_id (this, palette_index, numPalettes); }
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hb_ot_name_id_t get_color_name_id (unsigned int color_index) const
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{ return v1 ().get_color_name_id (this, color_index, numColors); }
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unsigned int get_palette_colors (unsigned int palette_index,
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unsigned int start_offset,
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unsigned int *color_count, /* IN/OUT. May be NULL. */
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hb_color_t *colors /* OUT. May be NULL. */) const
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{
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if (unlikely (palette_index >= numPalettes))
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{
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if (color_count) *color_count = 0;
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return 0;
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}
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unsigned int start_index = colorRecordIndicesZ[palette_index];
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hb_array_t<const BGRAColor> all_colors ((this+colorRecordsZ).arrayZ, numColorRecords);
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hb_array_t<const BGRAColor> palette_colors = all_colors.sub_array (start_index,
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numColors);
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if (color_count)
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{
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hb_array_t<const BGRAColor> segment_colors = palette_colors.sub_array (start_offset, *color_count);
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/* Always return numColors colors per palette even if it has out-of-bounds start index. */
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unsigned int count = hb_min ((unsigned) hb_max ((int) (numColors - start_offset), 0), *color_count);
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*color_count = count;
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for (unsigned int i = 0; i < count; i++)
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colors[i] = segment_colors[i]; /* Bound-checked read. */
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}
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return numColors;
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}
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private:
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const CPALV1Tail& v1 () const
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{
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if (version == 0) return Null(CPALV1Tail);
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return StructAfter<CPALV1Tail> (*this);
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}
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public:
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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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(this+colorRecordsZ).sanitize (c, numColorRecords) &&
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colorRecordIndicesZ.sanitize (c, numPalettes) &&
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(version == 0 || v1 ().sanitize (c, this, numPalettes, numColors)));
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}
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protected:
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HBUINT16 version; /* Table version number */
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/* Version 0 */
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HBUINT16 numColors; /* Number of colors in each palette. */
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HBUINT16 numPalettes; /* Number of palettes in the table. */
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HBUINT16 numColorRecords; /* Total number of color records, combined for
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* all palettes. */
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LNNOffsetTo<UnsizedArrayOf<BGRAColor>>
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colorRecordsZ; /* Offset from the beginning of CPAL table to
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* the first ColorRecord. */
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UnsizedArrayOf<HBUINT16>
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colorRecordIndicesZ; /* Index of each palette’s first color record in
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* the combined color record array. */
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/*CPALV1Tail v1;*/
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public:
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DEFINE_SIZE_ARRAY (12, colorRecordIndicesZ);
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};
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} /* namespace OT */
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#endif /* HB_OT_COLOR_CPAL_TABLE_HH */
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