Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/gfx/thebes/gfxFT2Utils.h b/gfx/thebes/gfxFT2Utils.h
new file mode 100644
index 0000000000..37e930c743
--- /dev/null
+++ b/gfx/thebes/gfxFT2Utils.h
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * 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 GFX_FT2UTILS_H
+#define GFX_FT2UTILS_H
+
+#include "cairo-ft.h"
+#include "gfxFT2FontBase.h"
+#include "mozilla/Likely.h"
+
+// Rounding and truncation functions for a FreeType fixed point number
+// (FT26Dot6) stored in a 32bit integer with high 26 bits for the integer
+// part and low 6 bits for the fractional part.
+#define FLOAT_FROM_26_6(x) ((x) / 64.0)
+#define FLOAT_FROM_16_16(x) ((x) / 65536.0)
+#define ROUND_26_6_TO_INT(x) ((x) >= 0 ? ((32 + (x)) >> 6) : -((32 - (x)) >> 6))
+
+typedef struct FT_FaceRec_* FT_Face;
+
+/**
+ * BEWARE: Recursively locking with gfxFT2LockedFace is not supported.
+ * Do not instantiate gfxFT2LockedFace within the scope of another instance.
+ * Do not attempt to call into Cairo within the scope of gfxFT2LockedFace,
+ * as that may accidentally try to re-lock the face within Cairo itself
+ * and thus deadlock.
+ */
+class MOZ_STACK_CLASS gfxFT2LockedFace {
+ public:
+  explicit gfxFT2LockedFace(const gfxFT2FontBase* aFont)
+      : mGfxFont(aFont), mFace(aFont->LockFTFace()) {}
+  ~gfxFT2LockedFace() {
+    if (mFace) {
+      mGfxFont->UnlockFTFace();
+    }
+  }
+
+  FT_Face get() { return mFace; };
+
+  /**
+   * Get the glyph id for a Unicode character representable by a single
+   * glyph, or return zero if there is no such glyph.  This does no caching,
+   * so you probably want gfxFcFont::GetGlyph.
+   */
+  uint32_t GetGlyph(uint32_t aCharCode);
+  /**
+   * Returns 0 if there is no variation selector cmap subtable.
+   */
+  uint32_t GetUVSGlyph(uint32_t aCharCode, uint32_t aVariantSelector);
+
+ protected:
+  typedef FT_UInt (*CharVariantFunction)(FT_Face face, FT_ULong charcode,
+                                         FT_ULong variantSelector);
+  CharVariantFunction FindCharVariantFunction();
+
+  const gfxFT2FontBase* MOZ_NON_OWNING_REF mGfxFont;  // owned by caller
+  FT_Face mFace;
+};
+
+// A couple of FreeType-based utilities shared by gfxFontconfigFontEntry
+// and FT2FontEntry.
+
+typedef struct FT_MM_Var_ FT_MM_Var;
+
+class gfxFT2Utils {
+ public:
+  static void GetVariationAxes(const FT_MM_Var* aMMVar,
+                               nsTArray<gfxFontVariationAxis>& aAxes);
+
+  static void GetVariationInstances(
+      gfxFontEntry* aFontEntry, const FT_MM_Var* aMMVar,
+      nsTArray<gfxFontVariationInstance>& aInstances);
+};
+
+#endif /* GFX_FT2UTILS_H */