The Tor Browser: comparison gfx/thebes/gfxSVGGlyphs.h

--1:000000000000
+:a06c3991127e
+/* 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

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comparison: gfx/thebes/gfxSVGGlyphs.h

gfx/thebes/gfxSVGGlyphs.h