/* * 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-private.hh" /* * Following parts to be moved to a public header. */ /** * hb_ot_color_t: * ARGB data type for holding color values. * * Since: REPLACEME */ typedef uint32_t hb_ot_color_t; /** * hb_ot_color_palette_flags_t: * @HB_OT_COLOR_PALETTE_FLAG_DEFAULT: default indicating that there is nothing special to note about a color palette. * @HB_OT_COLOR_PALETTE_FLAG_FOR_LIGHT_BACKGROUND: flag indicating that the color palette is suitable for rendering text on light background. * @HB_OT_COLOR_PALETTE_FLAG_FOR_DARK_BACKGROUND: flag indicating that the color palette is suitable for rendering text on dark background. * * Since: REPLACEME */ typedef enum { /*< flags >*/ HB_OT_COLOR_PALETTE_FLAG_DEFAULT = 0x00000000u, HB_OT_COLOR_PALETTE_FLAG_FOR_LIGHT_BACKGROUND = 0x00000001u, HB_OT_COLOR_PALETTE_FLAG_FOR_DARK_BACKGROUND = 0x00000002u, } hb_ot_color_palette_flags_t; // HB_EXTERN unsigned int // hb_ot_color_get_palette_count (hb_face_t *face); // HB_EXTERN unsigned int // hb_ot_color_get_palette_name_id (hb_face_t *face, unsigned int palette); // HB_EXTERN hb_ot_color_palette_flags_t // hb_ot_color_get_palette_flags (hb_face_t *face, unsigned int palette); // HB_EXTERN unsigned int // hb_ot_color_get_palette_colors (hb_face_t *face, // unsigned int palette, /* default=0 */ // unsigned int start_offset, // unsigned int *color_count /* IN/OUT */, // hb_ot_color_t *colors /* OUT */); /* * Color Palette * http://www.microsoft.com/typography/otspec/cpal.htm */ #define HB_OT_TAG_CPAL HB_TAG('C','P','A','L') namespace OT { struct CPALV1Tail { friend struct CPAL; inline bool sanitize (hb_sanitize_context_t *c, const void *base, unsigned int palettes) const { TRACE_SANITIZE (this); return_trace (c->check_struct (this) && (base+paletteFlagsZ).sanitize (c, palettes) && (base+paletteLabelZ).sanitize (c, palettes) && (base+paletteEntryLabelZ).sanitize (c, palettes)); } private: inline hb_ot_color_palette_flags_t get_palette_flags (const void *base, unsigned int palette) const { // range checked at the CPAL caller return (hb_ot_color_palette_flags_t) (uint32_t) (base+paletteFlagsZ)[palette]; } inline unsigned int get_palette_name_id (const void *base, unsigned int palette) const { // range checked at the CPAL caller return (base+paletteLabelZ)[palette]; } protected: LOffsetTo > paletteFlagsZ; /* Offset from the beginning of CPAL table to * the Palette Type Array. Set to 0 if no array * is provided. */ LOffsetTo > paletteLabelZ; /* Offset from the beginning of CPAL table to * the Palette Labels Array. Set to 0 if no * array is provided. */ LOffsetTo > paletteEntryLabelZ; /* Offset from the beginning of CPAL table to * the Palette Entry Label Array. Set to 0 * if no array is provided. */ public: DEFINE_SIZE_STATIC (12); }; typedef HBUINT32 BGRAColor; struct CPAL { static const hb_tag_t tableTag = HB_OT_TAG_CPAL; inline bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); if (!(c->check_struct (this) && // it checks colorRecordIndices also, see #get_size (this+colorRecordsZ).sanitize (c, numColorRecords))) return_trace (false); // Check for indices sanity so no need for doing it runtime for (unsigned int i = 0; i < numPalettes; ++i) if (colorRecordIndicesZ[i] + numPaletteEntries > numColorRecords) return_trace (false); // If version is zero, we are done here; otherwise we need to check tail also if (version == 0) return_trace (true); const CPALV1Tail &v1 = StructAfter (*this); return_trace (v1.sanitize (c, this, numPalettes)); } inline unsigned int get_size (void) const { return min_size + numPalettes * sizeof (HBUINT16); } inline hb_ot_color_palette_flags_t get_palette_flags (unsigned int palette) const { if (version == 0 || palette >= numPalettes) return HB_OT_COLOR_PALETTE_FLAG_DEFAULT; const CPALV1Tail& cpal1 = StructAfter (*this); return cpal1.get_palette_flags (this, palette); } inline unsigned int get_palette_name_id (unsigned int palette) const { if (version == 0 || palette >= numPalettes) return 0xFFFF; const CPALV1Tail& cpal1 = StructAfter (*this); return cpal1.get_palette_name_id (this, palette); } inline unsigned int get_palette_count () const { return numPalettes; } inline hb_ot_color_t get_color_record_argb (unsigned int color_index, unsigned int palette) const { if (color_index >= numPaletteEntries || palette >= numPalettes) return 0; // No need for more range check as it is already done on #sanitize return (this+colorRecordsZ)[colorRecordIndicesZ[palette] + color_index]; } protected: HBUINT16 version; /* Table version number */ /* Version 0 */ HBUINT16 numPaletteEntries; /* Number of palette entries in each palette. */ HBUINT16 numPalettes; /* Number of palettes in the table. */ HBUINT16 numColorRecords; /* Total number of color records, combined for * all palettes. */ LOffsetTo > colorRecordsZ; /* Offset from the beginning of CPAL table to * the first ColorRecord. */ UnsizedArrayOf 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 */