Support CPAL table
diff --git a/src/hb-ot-color.cc b/src/hb-ot-color.cc
new file mode 100644
index 0000000..58aa412
--- /dev/null
+++ b/src/hb-ot-color.cc
@@ -0,0 +1,213 @@
+/*
+ * Copyright © 2016 Google, Inc.
+ *
+ * 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
+ */
+
+#include "hb-open-type-private.hh"
+#include "hb-ot-cpal-table.hh"
+#include "hb-ot.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "hb-ot-layout-private.hh"
+#include "hb-shaper-private.hh"
+
+HB_MARK_AS_FLAG_T (hb_ot_color_palette_flags_t)
+HB_SHAPER_DATA_ENSURE_DECLARE(ot, face)
+
+
+static inline const OT::CPAL&
+_get_cpal (hb_face_t *face)
+{
+ if (unlikely (!hb_ot_shaper_face_data_ensure (face)))
+ return OT::Null(OT::CPAL);
+
+ hb_ot_layout_t * layout = hb_ot_layout_from_face (face);
+ if (!layout->cpal) {
+ layout->cpal_blob = OT::Sanitizer<OT::CPAL>::sanitize (face->reference_table (HB_OT_TAG_CPAL));
+ layout->cpal = OT::Sanitizer<OT::CPAL>::lock_instance (layout->cpal_blob);
+ }
+
+ return *layout->cpal;
+}
+
+
+/**
+ * hb_ot_color_get_palette_count:
+ * @face: a font face.
+ *
+ * Returns: the number of color palettes in @face, or zero if @face has
+ * no colors.
+ *
+ * Since: 1.2.8
+ */
+unsigned int
+hb_ot_color_get_palette_count (hb_face_t *face)
+{
+ const OT::CPAL& cpal = _get_cpal(face);
+ return &cpal != &OT::Null(OT::CPAL) ? cpal.numPalettes : 0;
+}
+
+
+/**
+ * hb_ot_color_get_palette_name_id:
+ * @face: a font face.
+ * @palette: the index of the color palette whose name is being requested.
+ *
+ * Retrieves the name id of a color palette. For example, a color font can
+ * have themed palettes like "Spring", "Summer", "Fall", and "Winter".
+ *
+ * Returns: an identifier within @face's `name` table.
+ * If the requested palette has no name, or if @face has no colors,
+ * or if @palette is not between 0 and hb_ot_color_get_palette_count(),
+ * the result is zero.
+ *
+ * Since: 1.2.8
+ */
+unsigned int
+hb_ot_color_get_palette_name_id (hb_face_t *face, unsigned int palette)
+{
+ const OT::CPAL& cpal = _get_cpal(face);
+ if (unlikely (&cpal == &OT::Null(OT::CPAL) || cpal.version == 0 ||
+ palette >= cpal.numPalettes)) {
+ return 0;
+ }
+
+ const OT::CPALV1Tail& cpal1 = OT::StructAfter<OT::CPALV1Tail>(cpal);
+ if (unlikely (&cpal1 == &OT::Null(OT::CPALV1Tail) ||
+ cpal1.paletteLabel.is_null())) {
+ return 0;
+ }
+
+ const OT::USHORT* name_ids = &cpal1.paletteLabel (&cpal);
+ const OT::USHORT name_id = name_ids [palette];
+
+ // According to the OpenType CPAL specification, 0xFFFF means name-less.
+ // We map 0xFFFF to 0 because zero is far more commonly used to indicate
+ // "no value".
+ return likely (name_id != 0xffff) ? name_id : 0;
+}
+
+
+/**
+ * hb_ot_color_get_palette_flags:
+ * @face: a font face
+ * @palette: the index of the color palette whose flags are being requested
+ *
+ * Returns: the flags for the requested color palette. If @face has no colors,
+ * or if @palette is not between 0 and hb_ot_color_get_palette_count(),
+ * the result is #HB_OT_COLOR_PALETTE_FLAG_DEFAULT.
+ *
+ * Since: 1.2.8
+ */
+hb_ot_color_palette_flags_t
+hb_ot_color_get_palette_flags (hb_face_t *face, unsigned int palette)
+{
+ const OT::CPAL& cpal = _get_cpal(face);
+ if (unlikely (&cpal == &OT::Null(OT::CPAL) || cpal.version == 0 ||
+ palette >= cpal.numPalettes)) {
+ return HB_OT_COLOR_PALETTE_FLAG_DEFAULT;
+ }
+
+ const OT::CPALV1Tail& cpal1 = OT::StructAfter<OT::CPALV1Tail>(cpal);
+ if (unlikely (&cpal1 == &OT::Null(OT::CPALV1Tail) ||
+ cpal1.paletteFlags.is_null())) {
+ return HB_OT_COLOR_PALETTE_FLAG_DEFAULT;
+ }
+
+ const OT::ULONG* flags = &cpal1.paletteFlags(&cpal);
+ const uint32_t flag = static_cast<uint32_t> (flags [palette]);
+ return static_cast<hb_ot_color_palette_flags_t> (flag);
+}
+
+
+/**
+ * hb_ot_color_get_palette_colors:
+ * @face: a font face.
+ * @palette: the index of the color palette whose colors
+ * are being requested.
+ * @start_offset: the index of the first color being requested.
+ * @color_count: (inout) (optional): on input, how many colors
+ * can be maximally stored into the @colors array;
+ * on output, how many colors were actually stored.
+ * @colors: (out caller-allocates) (array length=color_count) (optional):
+ * an array of #hb_ot_color_t records. After calling
+ * this function, @colors will be filled with
+ * the palette colors. If @colors is NULL, the function
+ * will just return the number of total colors
+ * without storing any actual colors; this can be used
+ * for allocating a buffer of suitable size before calling
+ * hb_ot_color_get_palette_colors() a second time.
+ *
+ * Retrieves the colors in a color palette.
+ *
+ * Returns: the total number of colors in the palette. All palettes in
+ * a font have the same number of colors. If @face has no colors, or if
+ * @palette is not between 0 and hb_ot_color_get_palette_count(),
+ * the result is zero.
+ *
+ * Since: 1.2.8
+ */
+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 */)
+{
+ const OT::CPAL& cpal = _get_cpal(face);
+ if (unlikely (&cpal == &OT::Null(OT::CPAL) ||
+ palette >= cpal.numPalettes))
+ {
+ if (color_count) *color_count = 0;
+ return 0;
+ }
+
+ const OT::ColorRecord* crec = &cpal.offsetFirstColorRecord (&cpal);
+ if (unlikely (crec == &OT::Null(OT::ColorRecord)))
+ {
+ if (color_count) *color_count = 0;
+ return 0;
+ }
+ crec += cpal.colorRecordIndices[palette];
+
+ unsigned int num_results = 0;
+ if (likely (color_count && colors))
+ {
+ for (unsigned int i = start_offset;
+ i < cpal.numPaletteEntries && num_results < *color_count; ++i)
+ {
+ hb_ot_color_t* result = &colors[num_results];
+ result->red = crec[i].red;
+ result->green = crec[i].green;
+ result->blue = crec[i].blue;
+ result->alpha = crec[i].alpha;
+ ++num_results;
+ }
+ }
+
+ if (likely (color_count)) *color_count = num_results;
+ return cpal.numPaletteEntries;
+}
