gecko-dev/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 "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;
} // 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();
virtual void DidRefresh() 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;
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 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:
typedef mozilla::gfx::DrawTarget DrawTarget;
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(const DrawTarget* aDrawTarget,
float aOpacity,
const gfxMatrix& aCTM) = 0;
virtual already_AddRefed<gfxPattern> GetStrokePattern(const DrawTarget* aDrawTarget,
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 DrawTarget* aDrawTarget,
const gfxMatrix& aCTM) {
return GetFillPattern(aDrawTarget, GetFillOpacity(), aCTM);
}
already_AddRefed<gfxPattern> GetStrokePattern(const DrawTarget* aDrawTarget,
const gfxMatrix& aCTM) {
return GetStrokePattern(aDrawTarget, 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 mozilla::gfx::Color sZero;
public:
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) {
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) {
if (mStrokePattern) {
mStrokePattern->SetMatrix(aCTM * mStrokeMatrix);
}
RefPtr<gfxPattern> strokePattern = mStrokePattern;
return strokePattern.forget();
}
float GetFillOpacity() {
return mFillPattern ? 1.0f : 0.0f;
}
float GetStrokeOpacity() {
return mStrokePattern ? 1.0f : 0.0f;
}
private:
RefPtr<gfxPattern> mFillPattern;
RefPtr<gfxPattern> mStrokePattern;
// Device space to pattern space transforms
gfxMatrix mFillMatrix;
gfxMatrix mStrokeMatrix;
};
#endif