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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 */
#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;
gfxSVGGlyphsDocument(const uint8_t* aBuffer, uint32_t aBufLen,
gfxSVGGlyphs* aSVGGlyphs);
Element* GetGlyphElement(uint32_t aGlyphId);
void DidRefresh() override;
size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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 {
typedef mozilla::dom::Element Element;
* @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.
* 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;
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 {
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();
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;
RefPtr<gfxPattern> mFillPattern;
RefPtr<gfxPattern> mStrokePattern;
// Device space to pattern space transforms
gfxMatrix mFillMatrix;
gfxMatrix mStrokeMatrix;