DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (b6057e17f856)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283
/* 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