1 files changed, 239 insertions, 0 deletions
diff --git a/gfx/thebes/gfxSVGGlyphs.h b/gfx/thebes/gfxSVGGlyphs.h
new file mode 100644
index 0000000000..8ce2e5aa6c
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+++ b/gfx/thebes/gfxSVGGlyphs.h
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+/* 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_SVG_GLYPHS_WRAPPER_H
+#define GFX_SVG_GLYPHS_WRAPPER_H
+
+#include "gfxFontUtils.h"
+#include "mozilla/gfx/2D.h"
+#include "nsString.h"
+#include "nsClassHashtable.h"
+#include "nsBaseHashtable.h"
+#include "nsHashKeys.h"
+#include "gfxPattern.h"
+#include "mozilla/gfx/UserData.h"
+#include "mozilla/SVGContextPaint.h"
+#include "nsRefreshObservers.h"
+
+class nsIContentViewer;
+class gfxSVGGlyphs;
+
+namespace mozilla {
+class PresShell;
+class SVGContextPaint;
+namespace dom {
+class Document;
+class Element;
+}  // namespace dom
+}  // namespace mozilla
+
+/**
+ * Wraps an SVG document contained in the SVG table of an OpenType font.
+ * There may be multiple SVG documents in an SVG table which we lazily parse
+ *   so we have an instance of this class for every document in the SVG table
+ *   which contains a glyph ID which has been used
+ * Finds and looks up elements contained in the SVG document which have glyph
+ *   mappings to be drawn by gfxSVGGlyphs
+ */
+class gfxSVGGlyphsDocument final : public nsAPostRefreshObserver {
+  typedef mozilla::dom::Element Element;
+
+ public:
+  gfxSVGGlyphsDocument(const uint8_t* aBuffer, uint32_t aBufLen,
+                       gfxSVGGlyphs* aSVGGlyphs);
+
+  Element* GetGlyphElement(uint32_t aGlyphId);
+
+  ~gfxSVGGlyphsDocument();
+
+  void DidRefresh() override;
+
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+ private:
+  nsresult ParseDocument(const uint8_t* aBuffer, uint32_t aBufLen);
+
+  nsresult SetupPresentation();
+
+  void FindGlyphElements(Element* aElement);
+
+  void InsertGlyphId(Element* aGlyphElement);
+
+  // Weak so as not to create a cycle. mOwner owns us so this can't dangle.
+  gfxSVGGlyphs* mOwner;
+  RefPtr<mozilla::dom::Document> mDocument;
+  nsCOMPtr<nsIContentViewer> mViewer;
+  RefPtr<mozilla::PresShell> mPresShell;
+
+  nsBaseHashtable<nsUint32HashKey, Element*, Element*> mGlyphIdMap;
+
+  nsCString mSVGGlyphsDocumentURI;
+};
+
+/**
+ * Used by |gfxFontEntry| to represent the SVG table of an OpenType font.
+ * Handles lazy parsing of the SVG documents in the table, looking up SVG glyphs
+ *   and rendering SVG glyphs.
+ * Each |gfxFontEntry| owns at most one |gfxSVGGlyphs| instance.
+ */
+class gfxSVGGlyphs {
+ private:
+  typedef mozilla::dom::Element Element;
+
+ public:
+  /**
+   * @param aSVGTable The SVG table from the OpenType font
+   *
+   * The gfxSVGGlyphs object takes over ownership of the blob references
+   * that are passed in, and will hb_blob_destroy() them when finished;
+   * the caller should -not- destroy these references.
+   */
+  gfxSVGGlyphs(hb_blob_t* aSVGTable, gfxFontEntry* aFontEntry);
+
+  /**
+   * Releases our references to the SVG table and cleans up everything else.
+   */
+  ~gfxSVGGlyphs();
+
+  /**
+   * This is called when the refresh driver has ticked.
+   */
+  void DidRefresh();
+
+  /**
+   * Find the |gfxSVGGlyphsDocument| containing an SVG glyph for |aGlyphId|.
+   * If |aGlyphId| does not map to an SVG document, return null.
+   * If a |gfxSVGGlyphsDocument| has not been created for the document, create
+   * one.
+   */
+  gfxSVGGlyphsDocument* FindOrCreateGlyphsDocument(uint32_t aGlyphId);
+
+  /**
+   * Return true iff there is an SVG glyph for |aGlyphId|
+   */
+  bool HasSVGGlyph(uint32_t aGlyphId);
+
+  /**
+   * Render the SVG glyph for |aGlyphId|
+   * @param aContextPaint Information on text context paints.
+   *   See |SVGContextPaint|.
+   */
+  void RenderGlyph(gfxContext* aContext, uint32_t aGlyphId,
+                   mozilla::SVGContextPaint* aContextPaint);
+
+  /**
+   * Get the extents for the SVG glyph associated with |aGlyphId|
+   * @param aSVGToAppSpace The matrix mapping the SVG glyph space to the
+   *   target context space
+   */
+  bool GetGlyphExtents(uint32_t aGlyphId, const gfxMatrix& aSVGToAppSpace,
+                       gfxRect* aResult);
+
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+ private:
+  Element* GetGlyphElement(uint32_t aGlyphId);
+
+  nsClassHashtable<nsUint32HashKey, gfxSVGGlyphsDocument> mGlyphDocs;
+  nsBaseHashtable<nsUint32HashKey, Element*, Element*> mGlyphIdMap;
+
+  hb_blob_t* mSVGData;
+
+  // pointer to the font entry that owns this gfxSVGGlyphs object
+  gfxFontEntry* MOZ_NON_OWNING_REF mFontEntry;
+
+  const struct Header {
+    mozilla::AutoSwap_PRUint16 mVersion;
+    mozilla::AutoSwap_PRUint32 mDocIndexOffset;
+    mozilla::AutoSwap_PRUint32 mColorPalettesOffset;
+  } * mHeader;
+
+  struct IndexEntry {
+    mozilla::AutoSwap_PRUint16 mStartGlyph;
+    mozilla::AutoSwap_PRUint16 mEndGlyph;
+    mozilla::AutoSwap_PRUint32 mDocOffset;
+    mozilla::AutoSwap_PRUint32 mDocLength;
+  };
+
+  const struct DocIndex {
+    mozilla::AutoSwap_PRUint16 mNumEntries;
+    IndexEntry mEntries[1]; /* actual length = mNumEntries */
+  } * mDocIndex;
+
+  static int CompareIndexEntries(const void* _a, const void* _b);
+};
+
+/**
+ * XXX This is a complete hack and should die (see bug 1291494).
+ *
+ * This class is used when code fails to pass through an SVGContextPaint from
+ * the context in which we are painting.  In that case we create one of these
+ * as a fallback and have it wrap the gfxContext's current gfxPattern and
+ * pretend that that is the paint context's fill pattern.  In some contexts
+ * that will be the case, in others it will not.  As we convert more code to
+ * Moz2D the less likely it is that this hack will work.  It will also make
+ * converting to Moz2D harder.
+ */
+class SimpleTextContextPaint : public mozilla::SVGContextPaint {
+ private:
+  static const mozilla::gfx::DeviceColor sZero;
+
+  static gfxMatrix SetupDeviceToPatternMatrix(gfxPattern* aPattern,
+                                              const gfxMatrix& aCTM) {
+    if (!aPattern) {
+      return gfxMatrix();
+    }
+    gfxMatrix deviceToUser = aCTM;
+    if (!deviceToUser.Invert()) {
+      return gfxMatrix(0, 0, 0, 0, 0, 0);  // singular
+    }
+    return deviceToUser * aPattern->GetMatrix();
+  }
+
+ public:
+  SimpleTextContextPaint(gfxPattern* aFillPattern, gfxPattern* aStrokePattern,
+                         const gfxMatrix& aCTM)
+      : mFillPattern(aFillPattern ? aFillPattern : new gfxPattern(sZero)),
+        mStrokePattern(aStrokePattern ? aStrokePattern
+                                      : new gfxPattern(sZero)) {
+    mFillMatrix = SetupDeviceToPatternMatrix(aFillPattern, aCTM);
+    mStrokeMatrix = SetupDeviceToPatternMatrix(aStrokePattern, aCTM);
+  }
+
+  already_AddRefed<gfxPattern> GetFillPattern(
+      const DrawTarget* aDrawTarget, float aOpacity, const gfxMatrix& aCTM,
+      imgDrawingParams& aImgParams) override {
+    if (mFillPattern) {
+      mFillPattern->SetMatrix(aCTM * mFillMatrix);
+    }
+    RefPtr<gfxPattern> fillPattern = mFillPattern;
+    return fillPattern.forget();
+  }
+
+  already_AddRefed<gfxPattern> GetStrokePattern(
+      const DrawTarget* aDrawTarget, float aOpacity, const gfxMatrix& aCTM,
+      imgDrawingParams& aImgParams) override {
+    if (mStrokePattern) {
+      mStrokePattern->SetMatrix(aCTM * mStrokeMatrix);
+    }
+    RefPtr<gfxPattern> strokePattern = mStrokePattern;
+    return strokePattern.forget();
+  }
+
+  float GetFillOpacity() const override { return mFillPattern ? 1.0f : 0.0f; }
+
+  float GetStrokeOpacity() const override {
+    return mStrokePattern ? 1.0f : 0.0f;
+  }
+
+ private:
+  RefPtr<gfxPattern> mFillPattern;
+  RefPtr<gfxPattern> mStrokePattern;
+
+  // Device space to pattern space transforms
+  gfxMatrix mFillMatrix;
+  gfxMatrix mStrokeMatrix;
+};
+
+#endif