1 files changed, 59 insertions, 0 deletions
diff --git a/gfx/2d/SFNTData.h b/gfx/2d/SFNTData.h
new file mode 100644
index 0000000000..334438efc0
--- /dev/null
+++ b/gfx/2d/SFNTData.h
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef mozilla_gfx_SFNTData_h
+#define mozilla_gfx_SFNTData_h
+
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Vector.h"
+
+namespace mozilla {
+namespace gfx {
+
+class SFNTData final {
+ public:
+  /**
+   * Creates an SFNTData if the header is a format that we understand and
+   * aDataLength is sufficient for the length information in the header data.
+   * Note that the data is NOT copied, so must exist the SFNTData's lifetime.
+   *
+   * @param aFontData the SFNT data.
+   * @param aDataLength length
+   * @return UniquePtr to a SFNTData or nullptr if the header is invalid.
+   */
+  static UniquePtr<SFNTData> Create(const uint8_t* aFontData,
+                                    uint32_t aDataLength);
+
+  /**
+   * Creates a unique key for the given font data and variation settings.
+   *
+   * @param aFontData the SFNT data
+   * @param aDataLength length
+   * @return unique key to be used for caching
+   */
+  static uint64_t GetUniqueKey(const uint8_t* aFontData, uint32_t aDataLength,
+                               uint32_t aVarDataSize, const void* aVarData);
+
+  ~SFNTData();
+
+ private:
+  SFNTData() = default;
+
+  bool AddFont(const uint8_t* aFontData, uint32_t aDataLength,
+               uint32_t aOffset);
+
+  uint32_t HashHeadAndCmapTables();
+
+  // Internal representation of single font in font file.
+  class Font;
+
+  Vector<Font*> mFonts;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // mozilla_gfx_SFNTData_h