1 files changed, 88 insertions, 0 deletions
diff --git a/gfx/thebes/gencjkcisvs.py b/gfx/thebes/gencjkcisvs.py
new file mode 100644
index 0000000000..1797f2be6c
--- /dev/null
+++ b/gfx/thebes/gencjkcisvs.py
@@ -0,0 +1,88 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os.path
+import re
+import sys
+
+f = open(sys.argv[1] if len(sys.argv) > 1 else "StandardizedVariants.txt")
+
+line = f.readline()
+m = re.compile("^# (StandardizedVariants(-\d+(\.\d+)*)?\.txt)").search(line)
+fileversion = m.group(1)
+vsdict = {}
+r = re.compile(
+    "^([0-9A-F]{4,6}) (FE0[0-9A-F]); CJK COMPATIBILITY IDEOGRAPH-([0-9A-F]{4,6});"
+)
+while True:
+    line = f.readline()
+    if not line:
+        break
+    if "CJK COMPATIBILITY IDEOGRAPH-" not in line:
+        continue
+
+    m = r.search(line)
+    unified = int(m.group(1), 16)
+    vs = int(m.group(2), 16)
+    compat = int(m.group(3), 16)
+
+    if vs not in vsdict:
+        vsdict[vs] = {}
+    vsdict[vs][unified] = compat
+
+f.close
+
+offsets = []
+length = 10 + 11 * len(vsdict)
+for (k, mappings) in sorted(vsdict.items()):
+    offsets.append(length)
+    length += 4 + 5 * len(mappings)
+
+f = open(sys.argv[2] if len(sys.argv) > 2 else "CJKCompatSVS.cpp", "wb")
+f.write(
+    """// Generated by %s. Do not edit.
+
+#include <stdint.h>
+
+#define U16(v) (((v) >> 8) & 0xFF), ((v) & 0xFF)
+#define U24(v) (((v) >> 16) & 0xFF), (((v) >> 8) & 0xFF), ((v) & 0xFF)
+#define U32(v) (((v) >> 24) & 0xFF), (((v) >> 16) & 0xFF), (((v) >> 8) & 0xFF), ((v) & 0xFF)
+#define GLYPH(v) U16(v >= 0x2F800 ? (v) - (0x2F800 - 0xFB00) : (v))
+
+// Fallback mappings for CJK Compatibility Ideographs Standardized Variants
+// taken from %s.
+// Using OpenType format 14 cmap subtable structure to reuse the lookup code
+// for fonts. The glyphID field is used to store the corresponding codepoints
+// CJK Compatibility Ideographs. To fit codepoints into the 16-bit glyphID
+// field, CJK Compatibility Ideographs Supplement (U+2F800..U+2FA1F) will be
+// mapped to 0xFB00..0xFD1F.
+extern const uint8_t sCJKCompatSVSTable[] = {
+"""
+    % (os.path.basename(sys.argv[0]), fileversion)
+)
+f.write("  U16(14), // format\n")
+f.write("  U32(%d), // length\n" % length)
+f.write("  U32(%d), // numVarSelectorRecords\n" % len(vsdict))
+for i, k in enumerate(sorted(vsdict.keys())):
+    f.write(
+        "    U24(0x%04X), U32(0), U32(%d), // varSelectorRecord[%d]\n"
+        % (k, offsets[i], i)
+    )
+for (k, mappings) in sorted(vsdict.items()):
+    f.write("  // 0x%04X\n" % k)
+    f.write("  U32(%d), // numUVSMappings\n" % len(mappings))
+    for (unified, compat) in sorted(mappings.items()):
+        f.write("    U24(0x%04X), GLYPH(0x%04X),\n" % (unified, compat))
+f.write(
+    """};
+
+#undef U16
+#undef U24
+#undef U32
+#undef GLYPH
+
+static_assert(sizeof sCJKCompatSVSTable == %d, "Table generator has a bug.");
+"""
+    % length
+)