diff -r 000000000000 -r 6474c204b198 gfx/thebes/gfxSVGGlyphs.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/thebes/gfxSVGGlyphs.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,283 @@
+/* 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 "nsString.h"
+#include "nsAutoPtr.h"
+#include "nsClassHashtable.h"
+#include "nsBaseHashtable.h"
+#include "nsHashKeys.h"
+#include "gfxPattern.h"
+#include "mozilla/gfx/UserData.h"
+#include "nsRefreshDriver.h"
+#include "DrawMode.h"
+
+class nsIDocument;
+class nsIContentViewer;
+class nsIPresShell;
+class gfxSVGGlyphs;
+class gfxTextContextPaint;
+
+namespace mozilla {
+namespace dom {
+class Element;
+}
+}
+
+/**
+ * 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 MOZ_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();
+
+    virtual void DidRefresh() MOZ_OVERRIDE;
+
+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;
+    nsCOMPtr<nsIDocument> mDocument;
+    nsCOMPtr<nsIContentViewer> mViewer;
+    nsCOMPtr<nsIPresShell> mPresShell;
+
+    nsBaseHashtable<nsUint32HashKey, Element*, Element*> mGlyphIdMap;
+
+    nsAutoCString 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 aDrawMode Whether to fill or stroke or both; see DrawMode
+     * @param aContextPaint Information on text context paints.
+     *   See |gfxTextContextPaint|.
+     */
+    bool RenderGlyph(gfxContext *aContext, uint32_t aGlyphId, DrawMode aDrawMode,
+                     gfxTextContextPaint *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);
+
+private:
+    Element *GetGlyphElement(uint32_t aGlyphId);
+
+    nsClassHashtable<nsUint32HashKey, gfxSVGGlyphsDocument> mGlyphDocs;
+    nsBaseHashtable<nsUint32HashKey, Element*, Element*> mGlyphIdMap;
+
+    hb_blob_t *mSVGData;
+    gfxFontEntry *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);
+};
+
+/**
+ * Used for trickling down paint information through to SVG glyphs.
+ */
+class gfxTextContextPaint
+{
+protected:
+    gfxTextContextPaint() { }
+
+public:
+    static mozilla::gfx::UserDataKey sUserDataKey;
+
+    /*
+     * Get text context pattern with the specified opacity value.
+     * This lets us inherit paints and paint opacities (i.e. fill/stroke and
+     * fill-opacity/stroke-opacity) separately.
+     */
+    virtual already_AddRefed<gfxPattern> GetFillPattern(float aOpacity,
+                                                        const gfxMatrix& aCTM) = 0;
+    virtual already_AddRefed<gfxPattern> GetStrokePattern(float aOpacity,
+                                                          const gfxMatrix& aCTM) = 0;
+
+    virtual float GetFillOpacity() { return 1.0f; }
+    virtual float GetStrokeOpacity() { return 1.0f; }
+
+    void InitStrokeGeometry(gfxContext *aContext,
+                            float devUnitsPerSVGUnit);
+
+    FallibleTArray<gfxFloat>& GetStrokeDashArray() {
+        return mDashes;
+    }
+
+    gfxFloat GetStrokeDashOffset() {
+        return mDashOffset;
+    }
+
+    gfxFloat GetStrokeWidth() {
+        return mStrokeWidth;
+    }
+
+    already_AddRefed<gfxPattern> GetFillPattern(const gfxMatrix& aCTM) {
+        return GetFillPattern(GetFillOpacity(), aCTM);
+    }
+
+    already_AddRefed<gfxPattern> GetStrokePattern(const gfxMatrix& aCTM) {
+        return GetStrokePattern(GetStrokeOpacity(), aCTM);
+    }
+
+    virtual ~gfxTextContextPaint() { }
+
+private:
+    FallibleTArray<gfxFloat> mDashes;
+    gfxFloat mDashOffset;
+    gfxFloat mStrokeWidth;
+};
+
+/**
+ * For passing in patterns where the text context has no separate pattern
+ * opacity value.
+ */
+class SimpleTextContextPaint : public gfxTextContextPaint
+{
+private:
+    static const gfxRGBA sZero;
+
+public:
+    static gfxMatrix SetupDeviceToPatternMatrix(gfxPattern *aPattern,
+                                                const gfxMatrix& aCTM)
+    {
+        if (!aPattern) {
+            return gfxMatrix();
+        }
+        gfxMatrix deviceToUser = aCTM;
+        deviceToUser.Invert();
+        return deviceToUser * aPattern->GetMatrix();
+    }
+
+    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(float aOpacity,
+                                                const gfxMatrix& aCTM) {
+        if (mFillPattern) {
+            mFillPattern->SetMatrix(aCTM * mFillMatrix);
+        }
+        nsRefPtr<gfxPattern> fillPattern = mFillPattern;
+        return fillPattern.forget();
+    }
+
+    already_AddRefed<gfxPattern> GetStrokePattern(float aOpacity,
+                                                  const gfxMatrix& aCTM) {
+        if (mStrokePattern) {
+            mStrokePattern->SetMatrix(aCTM * mStrokeMatrix);
+        }
+        nsRefPtr<gfxPattern> strokePattern = mStrokePattern;
+        return strokePattern.forget();
+    }
+
+    float GetFillOpacity() {
+        return mFillPattern ? 1.0f : 0.0f;
+    }
+
+    float GetStrokeOpacity() {
+        return mStrokePattern ? 1.0f : 0.0f;
+    }
+
+private:
+    nsRefPtr<gfxPattern> mFillPattern;
+    nsRefPtr<gfxPattern> mStrokePattern;
+
+    // Device space to pattern space transforms
+    gfxMatrix mFillMatrix;
+    gfxMatrix mStrokeMatrix;
+};
+
+#endif