1 files changed, 138 insertions, 0 deletions
diff --git a/gfx/thebes/COLRFonts.h b/gfx/thebes/COLRFonts.h
new file mode 100644
index 0000000000..57129f1364
--- /dev/null
+++ b/gfx/thebes/COLRFonts.h
@@ -0,0 +1,138 @@
+/* -*- 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 COLR_FONTS_H
+#define COLR_FONTS_H
+
+#include "mozilla/gfx/2D.h"
+#include "mozilla/UniquePtr.h"
+#include "nsAtom.h"
+#include "nsTArray.h"
+#include "nsTHashtable.h"
+
+struct hb_blob_t;
+struct hb_face_t;
+struct hb_font_t;
+
+namespace mozilla {
+
+namespace layout {
+class TextDrawTarget;
+}
+
+namespace gfx {
+
+class FontPaletteValueSet {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FontPaletteValueSet)
+
+  struct OverrideColor {
+    uint32_t mIndex = 0;
+    sRGBColor mColor;
+  };
+
+  struct PaletteValues {
+    enum { kLight = -1, kDark = -2 };
+    int32_t mBasePalette = 0;  // 0-based index, or kLight/kDark constants
+    nsTArray<OverrideColor> mOverrides;
+  };
+
+  const PaletteValues* Lookup(nsAtom* aName, const nsACString& aFamily) const;
+
+  PaletteValues* Insert(nsAtom* aName, const nsACString& aFamily);
+
+ private:
+  ~FontPaletteValueSet() = default;
+
+  struct PaletteHashKey {
+    RefPtr<nsAtom> mName;
+    nsCString mFamily;
+
+    PaletteHashKey() = delete;
+    PaletteHashKey(nsAtom* aName, const nsACString& aFamily)
+        : mName(aName), mFamily(aFamily) {}
+    PaletteHashKey(const PaletteHashKey& aKey) = default;
+  };
+
+  class HashEntry : public PLDHashEntryHdr {
+   public:
+    using KeyType = const PaletteHashKey&;
+    using KeyTypePointer = const PaletteHashKey*;
+
+    HashEntry() = delete;
+    explicit HashEntry(KeyTypePointer aKey) : mKey(*aKey) {}
+    HashEntry(HashEntry&& other) noexcept
+        : PLDHashEntryHdr(std::move(other)),
+          mKey(other.mKey),
+          mValue(std::move(other.mValue)) {
+      NS_ERROR("Should not be called");
+    }
+    ~HashEntry() = default;
+
+    bool KeyEquals(const KeyTypePointer aKey) const {
+      return mKey.mName == aKey->mName && mKey.mFamily.Equals(aKey->mFamily);
+    }
+    static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
+    static PLDHashNumber HashKey(const KeyTypePointer aKey) {
+      return aKey->mName->hash() +
+             HashString(aKey->mFamily.get(), aKey->mFamily.Length());
+    }
+    enum { ALLOW_MEMMOVE = true };
+
+    PaletteHashKey mKey;
+    PaletteValues mValue;
+  };
+
+  nsTHashtable<HashEntry> mValues;
+};
+
+class COLRFonts {
+ public:
+  static bool ValidateColorGlyphs(hb_blob_t* aCOLR, hb_blob_t* aCPAL);
+
+  // COLRv0: color glyph is represented as a simple list of colored layers.
+  // (This is used only as an opaque pointer; the internal type is private.)
+  struct GlyphLayers;
+
+  static const GlyphLayers* GetGlyphLayers(hb_blob_t* aCOLR, uint32_t aGlyphId);
+
+  static bool PaintGlyphLayers(
+      hb_blob_t* aCOLR, hb_face_t* aFace, const GlyphLayers* aLayers,
+      DrawTarget* aDrawTarget, layout::TextDrawTarget* aTextDrawer,
+      ScaledFont* aScaledFont, DrawOptions aDrawOptions, const Point& aPoint,
+      const sRGBColor& aCurrentColor, const nsTArray<sRGBColor>* aColors);
+
+  // COLRv1 support: color glyph is represented by a directed acyclic graph of
+  // paint records.
+  // (This is used only as an opaque pointer; the internal type is private.)
+  struct GlyphPaintGraph;
+
+  static const GlyphPaintGraph* GetGlyphPaintGraph(hb_blob_t* aCOLR,
+                                                   uint32_t aGlyphId);
+
+  static bool PaintGlyphGraph(
+      hb_blob_t* aCOLR, hb_font_t* aFont, const GlyphPaintGraph* aPaintGraph,
+      DrawTarget* aDrawTarget, layout::TextDrawTarget* aTextDrawer,
+      ScaledFont* aScaledFont, DrawOptions aDrawOptions, const Point& aPoint,
+      const sRGBColor& aCurrentColor, const nsTArray<sRGBColor>* aColors,
+      uint32_t aGlyphId, float aFontUnitsToPixels);
+
+  static Rect GetColorGlyphBounds(hb_blob_t* aCOLR, hb_font_t* aFont,
+                                  uint32_t aGlyphId, DrawTarget* aDrawTarget,
+                                  ScaledFont* aScaledFont,
+                                  float aFontUnitsToPixels);
+
+  static uint16_t GetColrTableVersion(hb_blob_t* aCOLR);
+
+  static nsTArray<sRGBColor> CreateColorPalette(
+      hb_face_t* aFace, const FontPaletteValueSet* aPaletteValueSet,
+      nsAtom* aFontPalette, const nsACString& aFamilyName);
+};
+
+}  // namespace gfx
+
+}  // namespace mozilla
+
+#endif  // COLR_FONTS_H