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Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ot-color-cpal-table.hh')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ot-color-cpal-table.hh | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-color-cpal-table.hh b/src/3rdparty/harfbuzz-ng/src/hb-ot-color-cpal-table.hh new file mode 100644 index 0000000000..1b3c7fc0b8 --- /dev/null +++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-color-cpal-table.hh @@ -0,0 +1,193 @@ +/* + * Copyright © 2016 Google, Inc. + * 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. + * + * Google Author(s): Sascha Brawer + */ + +#ifndef HB_OT_COLOR_CPAL_TABLE_HH +#define HB_OT_COLOR_CPAL_TABLE_HH + +#include "hb-open-type.hh" +#include "hb-ot-color.h" +#include "hb-ot-name.h" + + +/* + * CPAL -- Color Palette + * https://docs.microsoft.com/en-us/typography/opentype/spec/cpal + */ +#define HB_OT_TAG_CPAL HB_TAG('C','P','A','L') + + +namespace OT { + + +struct CPALV1Tail +{ + friend struct CPAL; + + private: + hb_ot_color_palette_flags_t get_palette_flags (const void *base, + unsigned int palette_index, + unsigned int palette_count) const + { + if (!paletteFlagsZ) return HB_OT_COLOR_PALETTE_FLAG_DEFAULT; + return (hb_ot_color_palette_flags_t) (uint32_t) + (base+paletteFlagsZ).as_array (palette_count)[palette_index]; + } + + hb_ot_name_id_t get_palette_name_id (const void *base, + unsigned int palette_index, + unsigned int palette_count) const + { + if (!paletteLabelsZ) return HB_OT_NAME_ID_INVALID; + return (base+paletteLabelsZ).as_array (palette_count)[palette_index]; + } + + hb_ot_name_id_t get_color_name_id (const void *base, + unsigned int color_index, + unsigned int color_count) const + { + if (!colorLabelsZ) return HB_OT_NAME_ID_INVALID; + return (base+colorLabelsZ).as_array (color_count)[color_index]; + } + + public: + bool sanitize (hb_sanitize_context_t *c, + const void *base, + unsigned int palette_count, + unsigned int color_count) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && + (!paletteFlagsZ || (base+paletteFlagsZ).sanitize (c, palette_count)) && + (!paletteLabelsZ || (base+paletteLabelsZ).sanitize (c, palette_count)) && + (!colorLabelsZ || (base+colorLabelsZ).sanitize (c, color_count))); + } + + protected: + LNNOffsetTo<UnsizedArrayOf<HBUINT32>> + paletteFlagsZ; /* Offset from the beginning of CPAL table to + * the Palette Type Array. Set to 0 if no array + * is provided. */ + LNNOffsetTo<UnsizedArrayOf<NameID>> + paletteLabelsZ; /* Offset from the beginning of CPAL table to + * the palette labels array. Set to 0 if no + * array is provided. */ + LNNOffsetTo<UnsizedArrayOf<NameID>> + colorLabelsZ; /* Offset from the beginning of CPAL table to + * the color labels array. Set to 0 + * if no array is provided. */ + public: + DEFINE_SIZE_STATIC (12); +}; + +typedef HBUINT32 BGRAColor; + +struct CPAL +{ + static constexpr hb_tag_t tableTag = HB_OT_TAG_CPAL; + + bool has_data () const { return numPalettes; } + + unsigned int get_size () const + { return min_size + numPalettes * sizeof (colorRecordIndicesZ[0]); } + + unsigned int get_palette_count () const { return numPalettes; } + unsigned int get_color_count () const { return numColors; } + + hb_ot_color_palette_flags_t get_palette_flags (unsigned int palette_index) const + { return v1 ().get_palette_flags (this, palette_index, numPalettes); } + + hb_ot_name_id_t get_palette_name_id (unsigned int palette_index) const + { return v1 ().get_palette_name_id (this, palette_index, numPalettes); } + + hb_ot_name_id_t get_color_name_id (unsigned int color_index) const + { return v1 ().get_color_name_id (this, color_index, numColors); } + + unsigned int get_palette_colors (unsigned int palette_index, + unsigned int start_offset, + unsigned int *color_count, /* IN/OUT. May be NULL. */ + hb_color_t *colors /* OUT. May be NULL. */) const + { + if (unlikely (palette_index >= numPalettes)) + { + if (color_count) *color_count = 0; + return 0; + } + unsigned int start_index = colorRecordIndicesZ[palette_index]; + hb_array_t<const BGRAColor> all_colors ((this+colorRecordsZ).arrayZ, numColorRecords); + hb_array_t<const BGRAColor> palette_colors = all_colors.sub_array (start_index, + numColors); + if (color_count) + { + hb_array_t<const BGRAColor> segment_colors = palette_colors.sub_array (start_offset, *color_count); + /* Always return numColors colors per palette even if it has out-of-bounds start index. */ + unsigned int count = hb_min ((unsigned) hb_max ((int) (numColors - start_offset), 0), *color_count); + *color_count = count; + for (unsigned int i = 0; i < count; i++) + colors[i] = segment_colors[i]; /* Bound-checked read. */ + } + return numColors; + } + + private: + const CPALV1Tail& v1 () const + { + if (version == 0) return Null(CPALV1Tail); + return StructAfter<CPALV1Tail> (*this); + } + + public: + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && + (this+colorRecordsZ).sanitize (c, numColorRecords) && + colorRecordIndicesZ.sanitize (c, numPalettes) && + (version == 0 || v1 ().sanitize (c, this, numPalettes, numColors))); + } + + protected: + HBUINT16 version; /* Table version number */ + /* Version 0 */ + HBUINT16 numColors; /* Number of colors in each palette. */ + HBUINT16 numPalettes; /* Number of palettes in the table. */ + HBUINT16 numColorRecords; /* Total number of color records, combined for + * all palettes. */ + LNNOffsetTo<UnsizedArrayOf<BGRAColor>> + colorRecordsZ; /* Offset from the beginning of CPAL table to + * the first ColorRecord. */ + UnsizedArrayOf<HBUINT16> + colorRecordIndicesZ; /* Index of each palette’s first color record in + * the combined color record array. */ +/*CPALV1Tail v1;*/ + public: + DEFINE_SIZE_ARRAY (12, colorRecordIndicesZ); +}; + +} /* namespace OT */ + + +#endif /* HB_OT_COLOR_CPAL_TABLE_HH */ |