295 lines
9.1 KiB
C++
295 lines
9.1 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFX_SVG_GLYPHS_WRAPPER_H
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#define GFX_SVG_GLYPHS_WRAPPER_H
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#include "gfxFontUtils.h"
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#include "mozilla/gfx/2D.h"
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#include "nsString.h"
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#include "nsAutoPtr.h"
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#include "nsClassHashtable.h"
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#include "nsBaseHashtable.h"
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#include "nsHashKeys.h"
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#include "gfxPattern.h"
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#include "mozilla/gfx/UserData.h"
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#include "nsRefreshDriver.h"
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#include "DrawMode.h"
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class nsIDocument;
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class nsIContentViewer;
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class nsIPresShell;
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class gfxSVGGlyphs;
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class gfxTextContextPaint;
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namespace mozilla {
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namespace dom {
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class Element;
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} // namespace dom
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} // namespace mozilla
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/**
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* Wraps an SVG document contained in the SVG table of an OpenType font.
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* There may be multiple SVG documents in an SVG table which we lazily parse
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* so we have an instance of this class for every document in the SVG table
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* which contains a glyph ID which has been used
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* Finds and looks up elements contained in the SVG document which have glyph
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* mappings to be drawn by gfxSVGGlyphs
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*/
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class gfxSVGGlyphsDocument final : public nsAPostRefreshObserver
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{
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typedef mozilla::dom::Element Element;
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public:
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gfxSVGGlyphsDocument(const uint8_t *aBuffer, uint32_t aBufLen,
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gfxSVGGlyphs *aSVGGlyphs);
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Element *GetGlyphElement(uint32_t aGlyphId);
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~gfxSVGGlyphsDocument();
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virtual void DidRefresh() override;
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private:
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nsresult ParseDocument(const uint8_t *aBuffer, uint32_t aBufLen);
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nsresult SetupPresentation();
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void FindGlyphElements(Element *aElement);
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void InsertGlyphId(Element *aGlyphElement);
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// Weak so as not to create a cycle. mOwner owns us so this can't dangle.
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gfxSVGGlyphs* mOwner;
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nsCOMPtr<nsIDocument> mDocument;
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nsCOMPtr<nsIContentViewer> mViewer;
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nsCOMPtr<nsIPresShell> mPresShell;
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nsBaseHashtable<nsUint32HashKey, Element*, Element*> mGlyphIdMap;
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nsCString mSVGGlyphsDocumentURI;
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};
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/**
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* Used by |gfxFontEntry| to represent the SVG table of an OpenType font.
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* Handles lazy parsing of the SVG documents in the table, looking up SVG glyphs
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* and rendering SVG glyphs.
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* Each |gfxFontEntry| owns at most one |gfxSVGGlyphs| instance.
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*/
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class gfxSVGGlyphs
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{
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private:
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typedef mozilla::dom::Element Element;
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public:
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/**
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* @param aSVGTable The SVG table from the OpenType font
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*
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* The gfxSVGGlyphs object takes over ownership of the blob references
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* that are passed in, and will hb_blob_destroy() them when finished;
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* the caller should -not- destroy these references.
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*/
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gfxSVGGlyphs(hb_blob_t *aSVGTable, gfxFontEntry *aFontEntry);
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/**
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* Releases our references to the SVG table and cleans up everything else.
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*/
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~gfxSVGGlyphs();
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/**
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* This is called when the refresh driver has ticked.
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*/
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void DidRefresh();
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/**
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* Find the |gfxSVGGlyphsDocument| containing an SVG glyph for |aGlyphId|.
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* If |aGlyphId| does not map to an SVG document, return null.
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* If a |gfxSVGGlyphsDocument| has not been created for the document, create one.
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*/
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gfxSVGGlyphsDocument *FindOrCreateGlyphsDocument(uint32_t aGlyphId);
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/**
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* Return true iff there is an SVG glyph for |aGlyphId|
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*/
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bool HasSVGGlyph(uint32_t aGlyphId);
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/**
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* Render the SVG glyph for |aGlyphId|
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* @param aDrawMode Whether to fill or stroke or both; see DrawMode
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* @param aContextPaint Information on text context paints.
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* See |gfxTextContextPaint|.
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*/
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bool RenderGlyph(gfxContext *aContext, uint32_t aGlyphId, DrawMode aDrawMode,
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gfxTextContextPaint *aContextPaint);
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/**
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* Get the extents for the SVG glyph associated with |aGlyphId|
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* @param aSVGToAppSpace The matrix mapping the SVG glyph space to the
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* target context space
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*/
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bool GetGlyphExtents(uint32_t aGlyphId, const gfxMatrix& aSVGToAppSpace,
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gfxRect *aResult);
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private:
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Element *GetGlyphElement(uint32_t aGlyphId);
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nsClassHashtable<nsUint32HashKey, gfxSVGGlyphsDocument> mGlyphDocs;
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nsBaseHashtable<nsUint32HashKey, Element*, Element*> mGlyphIdMap;
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hb_blob_t *mSVGData;
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gfxFontEntry *mFontEntry;
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const struct Header {
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mozilla::AutoSwap_PRUint16 mVersion;
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mozilla::AutoSwap_PRUint32 mDocIndexOffset;
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mozilla::AutoSwap_PRUint32 mColorPalettesOffset;
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} *mHeader;
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struct IndexEntry {
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mozilla::AutoSwap_PRUint16 mStartGlyph;
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mozilla::AutoSwap_PRUint16 mEndGlyph;
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mozilla::AutoSwap_PRUint32 mDocOffset;
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mozilla::AutoSwap_PRUint32 mDocLength;
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};
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const struct DocIndex {
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mozilla::AutoSwap_PRUint16 mNumEntries;
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IndexEntry mEntries[1]; /* actual length = mNumEntries */
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} *mDocIndex;
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static int CompareIndexEntries(const void *_a, const void *_b);
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};
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/**
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* Used for trickling down paint information through to SVG glyphs.
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*/
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class gfxTextContextPaint
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{
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protected:
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typedef mozilla::gfx::DrawTarget DrawTarget;
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gfxTextContextPaint() { }
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public:
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static mozilla::gfx::UserDataKey sUserDataKey;
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/*
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* Get text context pattern with the specified opacity value.
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* This lets us inherit paints and paint opacities (i.e. fill/stroke and
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* fill-opacity/stroke-opacity) separately.
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*/
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virtual already_AddRefed<gfxPattern> GetFillPattern(const DrawTarget* aDrawTarget,
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float aOpacity,
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const gfxMatrix& aCTM) = 0;
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virtual already_AddRefed<gfxPattern> GetStrokePattern(const DrawTarget* aDrawTarget,
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float aOpacity,
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const gfxMatrix& aCTM) = 0;
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virtual float GetFillOpacity() { return 1.0f; }
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virtual float GetStrokeOpacity() { return 1.0f; }
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void InitStrokeGeometry(gfxContext *aContext,
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float devUnitsPerSVGUnit);
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FallibleTArray<gfxFloat>& GetStrokeDashArray() {
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return mDashes;
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}
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gfxFloat GetStrokeDashOffset() {
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return mDashOffset;
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}
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gfxFloat GetStrokeWidth() {
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return mStrokeWidth;
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}
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already_AddRefed<gfxPattern> GetFillPattern(const DrawTarget* aDrawTarget,
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const gfxMatrix& aCTM) {
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return GetFillPattern(aDrawTarget, GetFillOpacity(), aCTM);
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}
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already_AddRefed<gfxPattern> GetStrokePattern(const DrawTarget* aDrawTarget,
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const gfxMatrix& aCTM) {
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return GetStrokePattern(aDrawTarget, GetStrokeOpacity(), aCTM);
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}
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virtual ~gfxTextContextPaint() { }
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private:
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FallibleTArray<gfxFloat> mDashes;
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gfxFloat mDashOffset;
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gfxFloat mStrokeWidth;
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};
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/**
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* For passing in patterns where the text context has no separate pattern
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* opacity value.
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*/
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class SimpleTextContextPaint : public gfxTextContextPaint
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{
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private:
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static const mozilla::gfx::Color sZero;
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public:
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static gfxMatrix SetupDeviceToPatternMatrix(gfxPattern *aPattern,
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const gfxMatrix& aCTM)
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{
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if (!aPattern) {
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return gfxMatrix();
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}
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gfxMatrix deviceToUser = aCTM;
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if (!deviceToUser.Invert()) {
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return gfxMatrix(0, 0, 0, 0, 0, 0); // singular
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}
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return deviceToUser * aPattern->GetMatrix();
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}
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SimpleTextContextPaint(gfxPattern *aFillPattern, gfxPattern *aStrokePattern,
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const gfxMatrix& aCTM) :
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mFillPattern(aFillPattern ? aFillPattern : new gfxPattern(sZero)),
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mStrokePattern(aStrokePattern ? aStrokePattern : new gfxPattern(sZero))
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{
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mFillMatrix = SetupDeviceToPatternMatrix(aFillPattern, aCTM);
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mStrokeMatrix = SetupDeviceToPatternMatrix(aStrokePattern, aCTM);
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}
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already_AddRefed<gfxPattern> GetFillPattern(const DrawTarget* aDrawTarget,
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float aOpacity,
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const gfxMatrix& aCTM) {
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if (mFillPattern) {
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mFillPattern->SetMatrix(aCTM * mFillMatrix);
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}
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RefPtr<gfxPattern> fillPattern = mFillPattern;
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return fillPattern.forget();
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}
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already_AddRefed<gfxPattern> GetStrokePattern(const DrawTarget* aDrawTarget,
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float aOpacity,
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const gfxMatrix& aCTM) {
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if (mStrokePattern) {
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mStrokePattern->SetMatrix(aCTM * mStrokeMatrix);
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}
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RefPtr<gfxPattern> strokePattern = mStrokePattern;
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return strokePattern.forget();
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}
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float GetFillOpacity() {
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return mFillPattern ? 1.0f : 0.0f;
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}
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float GetStrokeOpacity() {
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return mStrokePattern ? 1.0f : 0.0f;
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}
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private:
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RefPtr<gfxPattern> mFillPattern;
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RefPtr<gfxPattern> mStrokePattern;
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// Device space to pattern space transforms
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gfxMatrix mFillMatrix;
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gfxMatrix mStrokeMatrix;
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};
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#endif
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