C++ SkPoint::set方法代码示例

static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
    SkPoint center;
    center.set(SkScalarAve(pts[0].fX, pts[1].fX),
               SkScalarAve(pts[0].fY, pts[1].fY));
    return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
}

    static void drawBitmapMesh(JNIEnv* env, jobject, SkCanvas* canvas,
                          const SkBitmap* bitmap, int meshWidth, int meshHeight,
                          jfloatArray jverts, int vertIndex, jintArray jcolors,
                          int colorIndex, const SkPaint* paint) {

        const int ptCount = (meshWidth + 1) * (meshHeight + 1);
        const int indexCount = meshWidth * meshHeight * 6;

        AutoJavaFloatArray  vertA(env, jverts, vertIndex + (ptCount << 1));
        AutoJavaIntArray    colorA(env, jcolors, colorIndex + ptCount);
        
        /*  Our temp storage holds 2 or 3 arrays.
            texture points [ptCount * sizeof(SkPoint)]
            optionally vertex points [ptCount * sizeof(SkPoint)] if we need a
                copy to convert from float to fixed
            indices [ptCount * sizeof(uint16_t)]
        */
        ssize_t storageSize = ptCount * sizeof(SkPoint); // texs[]
#ifdef SK_SCALAR_IS_FIXED
        storageSize += ptCount * sizeof(SkPoint);  // storage for verts
#endif
        storageSize += indexCount * sizeof(uint16_t);  // indices[]

        SkAutoMalloc storage(storageSize);
        SkPoint* texs = (SkPoint*)storage.get();
        SkPoint* verts;
        uint16_t* indices;
#ifdef SK_SCALAR_IS_FLOAT
        verts = (SkPoint*)(vertA.ptr() + vertIndex);
        indices = (uint16_t*)(texs + ptCount);
#else
        verts = texs + ptCount;
        indices = (uint16_t*)(verts + ptCount);
        // convert floats to fixed
        {
            const float* src = vertA.ptr() + vertIndex;
            for (int i = 0; i < ptCount; i++) {
                verts[i].set(SkFloatToFixed(src[0]), SkFloatToFixed(src[1]));
                src += 2;
            }
        }
#endif

        // cons up texture coordinates and indices
        {
            const SkScalar w = SkIntToScalar(bitmap->width());
            const SkScalar h = SkIntToScalar(bitmap->height());
            const SkScalar dx = w / meshWidth;
            const SkScalar dy = h / meshHeight;
            
            SkPoint* texsPtr = texs;
            SkScalar y = 0;
            for (int i = 0; i <= meshHeight; i++) {
                if (i == meshHeight) {
                    y = h;  // to ensure numerically we hit h exactly
                }
                SkScalar x = 0;
                for (int j = 0; j < meshWidth; j++) {
                    texsPtr->set(x, y);
                    texsPtr += 1;
                    x += dx;
                }
                texsPtr->set(w, y);
                texsPtr += 1;
                y += dy;
            }
            SkASSERT(texsPtr - texs == ptCount);
        }
        
        // cons up indices
        {
            uint16_t* indexPtr = indices;
            int index = 0;
            for (int i = 0; i < meshHeight; i++) {
                for (int j = 0; j < meshWidth; j++) {
                    // lower-left triangle
                    *indexPtr++ = index;
                    *indexPtr++ = index + meshWidth + 1;
                    *indexPtr++ = index + meshWidth + 2;
                    // upper-right triangle
                    *indexPtr++ = index;
                    *indexPtr++ = index + meshWidth + 2;
                    *indexPtr++ = index + 1;
                    // bump to the next cell
                    index += 1;
                }
                // bump to the next row
                index += 1;
            }
            SkASSERT(indexPtr - indices == indexCount);
            SkASSERT((char*)indexPtr - (char*)storage.get() == storageSize);
        }

        // double-check that we have legal indices
#ifdef SK_DEBUG
        {
            for (int i = 0; i < indexCount; i++) {
                SkASSERT((unsigned)indices[i] < (unsigned)ptCount);
            }
        }
//.........这里部分代码省略.........

int SkLineClipper::ClipLine(const SkPoint pts[], const SkRect& clip, SkPoint lines[],
                            bool canCullToTheRight) {
    int index0, index1;

    if (pts[0].fY < pts[1].fY) {
        index0 = 0;
        index1 = 1;
    } else {
        index0 = 1;
        index1 = 0;
    }

    // Check if we're completely clipped out in Y (above or below

    if (pts[index1].fY <= clip.fTop) {  // we're above the clip
        return 0;
    }
    if (pts[index0].fY >= clip.fBottom) {  // we're below the clip
        return 0;
    }

    // Chop in Y to produce a single segment, stored in tmp[0..1]

    SkPoint tmp[2];
    memcpy(tmp, pts, sizeof(tmp));

    // now compute intersections
    if (pts[index0].fY < clip.fTop) {
        tmp[index0].set(sect_with_horizontal(pts, clip.fTop), clip.fTop);
        SkASSERT(is_between_unsorted(tmp[index0].fX, pts[0].fX, pts[1].fX));
    }
    if (tmp[index1].fY > clip.fBottom) {
        tmp[index1].set(sect_with_horizontal(pts, clip.fBottom), clip.fBottom);
        SkASSERT(is_between_unsorted(tmp[index1].fX, pts[0].fX, pts[1].fX));
    }

    // Chop it into 1..3 segments that are wholly within the clip in X.

    // temp storage for up to 3 segments
    SkPoint resultStorage[kMaxPoints];
    SkPoint* result;    // points to our results, either tmp or resultStorage
    int lineCount = 1;
    bool reverse;

    if (pts[0].fX < pts[1].fX) {
        index0 = 0;
        index1 = 1;
        reverse = false;
    } else {
        index0 = 1;
        index1 = 0;
        reverse = true;
    }

    if (tmp[index1].fX <= clip.fLeft) {  // wholly to the left
        tmp[0].fX = tmp[1].fX = clip.fLeft;
        result = tmp;
        reverse = false;
    } else if (tmp[index0].fX >= clip.fRight) {    // wholly to the right
        if (canCullToTheRight) {
            return 0;
        }
        tmp[0].fX = tmp[1].fX = clip.fRight;
        result = tmp;
        reverse = false;
    } else {
        result = resultStorage;
        SkPoint* r = result;

        if (tmp[index0].fX < clip.fLeft) {
            r->set(clip.fLeft, tmp[index0].fY);
            r += 1;
            r->set(clip.fLeft, sect_clamp_with_vertical(tmp, clip.fLeft));
            SkASSERT(is_between_unsorted(r->fY, tmp[0].fY, tmp[1].fY));
        } else {
            *r = tmp[index0];
        }
        r += 1;

        if (tmp[index1].fX > clip.fRight) {
            r->set(clip.fRight, sect_clamp_with_vertical(tmp, clip.fRight));
            SkASSERT(is_between_unsorted(r->fY, tmp[0].fY, tmp[1].fY));
            r += 1;
            r->set(clip.fRight, tmp[index1].fY);
        } else {
            *r = tmp[index1];
        }

        lineCount = SkToInt(r - result);
    }

    // Now copy the results into the caller's lines[] parameter
    if (reverse) {
        // copy the pts in reverse order to maintain winding order
        for (int i = 0; i <= lineCount; i++) {
            lines[lineCount - i] = result[i];
        }
    } else {
        memcpy(lines, result, (lineCount + 1) * sizeof(SkPoint));
    }
//.........这里部分代码省略.........

    PathClipView() {
        fOval.set(0, 0, SkIntToScalar(200), SkIntToScalar(50));
        fCenter.set(SkIntToScalar(250), SkIntToScalar(250));

//        test_ats();
    }

 virtual bool onClick(Click* click) {
     fCenter.set(click->fCurr.fX, click->fCurr.fY);
     this->inval(NULL);
     return NULL;
 }

bool SkMeshIndices::init(SkPoint tex[], uint16_t indices[],
                         int texW, int texH, int rows, int cols) {
    if (rows < 2 || cols < 2) {
        sk_free(fStorage);
        fStorage = nullptr;
        fTex = nullptr;
        fIndices = nullptr;
        fTexCount = fIndexCount = 0;
        return false;
    }

    sk_free(fStorage);
    fStorage = nullptr;

    fTexCount = rows * cols;
    rows -= 1;
    cols -= 1;
    fIndexCount = rows * cols * 6;

    if (tex) {
        fTex = tex;
        fIndices = indices;
    } else {
        fStorage = sk_malloc_throw(fTexCount * sizeof(SkPoint) +
                                   fIndexCount * sizeof(uint16_t));
        fTex = (SkPoint*)fStorage;
        fIndices = (uint16_t*)(fTex + fTexCount);
    }

    // compute the indices
    {
        uint16_t* idx = fIndices;
        int index = 0;
        for (int y = 0; y < cols; y++) {
            for (int x = 0; x < rows; x++) {
                *idx++ = index;
                *idx++ = index + rows + 1;
                *idx++ = index + 1;

                *idx++ = index + 1;
                *idx++ = index + rows + 1;
                *idx++ = index + rows + 2;

                index += 1;
            }
            index += 1;
        }
    }

    // compute texture coordinates
    {
        SkPoint* tex = fTex;
        const SkScalar dx = SkIntToScalar(texW) / rows;
        const SkScalar dy = SkIntToScalar(texH) / cols;
        for (int y = 0; y <= cols; y++) {
            for (int x = 0; x <= rows; x++) {
                tex->set(x*dx, y*dy);
                tex += 1;
            }
        }
    }
    return true;
}

static void test_matrix_homogeneous(skiatest::Reporter* reporter) {
    SkMatrix mat;

    const float kRotation0 = 15.5f;
    const float kRotation1 = -50.f;
    const float kScale0 = 5000.f;

#if defined(GOOGLE3)
    // Stack frame size is limited in GOOGLE3.
    const int kTripleCount = 100;
    const int kMatrixCount = 100;
#else
    const int kTripleCount = 1000;
    const int kMatrixCount = 1000;
#endif
    SkRandom rand;

    SkScalar randTriples[3*kTripleCount];
    for (int i = 0; i < 3*kTripleCount; ++i) {
        randTriples[i] = rand.nextRangeF(-3000.f, 3000.f);
    }

    SkMatrix mats[kMatrixCount];
    for (int i = 0; i < kMatrixCount; ++i) {
        for (int j = 0; j < 9; ++j) {
            mats[i].set(j, rand.nextRangeF(-3000.f, 3000.f));
        }
    }

    // identity
    {
    mat.reset();
    SkScalar dst[3*kTripleCount];
    mat.mapHomogeneousPoints(dst, randTriples, kTripleCount);
    REPORTER_ASSERT(reporter, scalar_array_nearly_equal_relative(randTriples, dst, kTripleCount*3));
    }

    // zero matrix
    {
    mat.setAll(0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f);
    SkScalar dst[3*kTripleCount];
    mat.mapHomogeneousPoints(dst, randTriples, kTripleCount);
    SkScalar zeros[3] = {0.f, 0.f, 0.f};
    for (int i = 0; i < kTripleCount; ++i) {
        REPORTER_ASSERT(reporter, scalar_array_nearly_equal_relative(&dst[i*3], zeros, 3));
    }
    }

    // zero point
    {
    SkScalar zeros[3] = {0.f, 0.f, 0.f};
    for (int i = 0; i < kMatrixCount; ++i) {
        SkScalar dst[3];
        mats[i].mapHomogeneousPoints(dst, zeros, 1);
        REPORTER_ASSERT(reporter, scalar_array_nearly_equal_relative(dst, zeros, 3));
    }
    }

    // doesn't crash with null dst, src, count == 0
    {
    mats[0].mapHomogeneousPoints(nullptr, nullptr, 0);
    }

    // uniform scale of point
    {
    mat.setScale(kScale0, kScale0);
    SkScalar dst[3];
    SkScalar src[3] = {randTriples[0], randTriples[1], 1.f};
    SkPoint pnt;
    pnt.set(src[0], src[1]);
    mat.mapHomogeneousPoints(dst, src, 1);
    mat.mapPoints(&pnt, &pnt, 1);
    REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dst[0], pnt.fX));
    REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dst[1], pnt.fY));
    REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dst[2], SK_Scalar1));
    }

    // rotation of point
    {
    mat.setRotate(kRotation0);
    SkScalar dst[3];
    SkScalar src[3] = {randTriples[0], randTriples[1], 1.f};
    SkPoint pnt;
    pnt.set(src[0], src[1]);
    mat.mapHomogeneousPoints(dst, src, 1);
    mat.mapPoints(&pnt, &pnt, 1);
    REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dst[0], pnt.fX));
    REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dst[1], pnt.fY));
    REPORTER_ASSERT(reporter, SkScalarNearlyEqual(dst[2], SK_Scalar1));
    }

    // rotation, scale, rotation of point
    {
    mat.setRotate(kRotation1);
    mat.postScale(kScale0, kScale0);
    mat.postRotate(kRotation0);
    SkScalar dst[3];
    SkScalar src[3] = {randTriples[0], randTriples[1], 1.f};
    SkPoint pnt;
    pnt.set(src[0], src[1]);
//.........这里部分代码省略.........

void GrAtlasTextBlob::appendGlyph(int runIndex,
                                  const SkRect& positions,
                                  GrColor color,
                                  GrBatchTextStrike* strike,
                                  GrGlyph* glyph,
                                  GrFontScaler* scaler, const SkGlyph& skGlyph,
                                  SkScalar x, SkScalar y, SkScalar scale, bool applyVM) {

    // If the glyph is too large we fall back to paths
    if (glyph->fTooLargeForAtlas) {
        this->appendLargeGlyph(glyph, scaler, skGlyph, x, y, scale, applyVM);
        return;
    }

    Run& run = fRuns[runIndex];
    GrMaskFormat format = glyph->fMaskFormat;

    Run::SubRunInfo* subRun = &run.fSubRunInfo.back();
    if (run.fInitialized && subRun->maskFormat() != format) {
        subRun = &run.push_back();
        subRun->setStrike(strike);
    } else if (!run.fInitialized) {
        subRun->setStrike(strike);
    }

    run.fInitialized = true;

    size_t vertexStride = GetVertexStride(format);

    subRun->setMaskFormat(format);

    subRun->joinGlyphBounds(positions);
    subRun->setColor(color);

    intptr_t vertex = reinterpret_cast<intptr_t>(this->fVertices + subRun->vertexEndIndex());

    if (kARGB_GrMaskFormat != glyph->fMaskFormat) {
        // V0
        SkPoint* position = reinterpret_cast<SkPoint*>(vertex);
        position->set(positions.fLeft, positions.fTop);
        SkColor* colorPtr = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint));
        *colorPtr = color;
        vertex += vertexStride;

        // V1
        position = reinterpret_cast<SkPoint*>(vertex);
        position->set(positions.fLeft, positions.fBottom);
        colorPtr = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint));
        *colorPtr = color;
        vertex += vertexStride;

        // V2
        position = reinterpret_cast<SkPoint*>(vertex);
        position->set(positions.fRight, positions.fBottom);
        colorPtr = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint));
        *colorPtr = color;
        vertex += vertexStride;

        // V3
        position = reinterpret_cast<SkPoint*>(vertex);
        position->set(positions.fRight, positions.fTop);
        colorPtr = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint));
        *colorPtr = color;
    } else {
        // V0
        SkPoint* position = reinterpret_cast<SkPoint*>(vertex);
        position->set(positions.fLeft, positions.fTop);
        vertex += vertexStride;

        // V1
        position = reinterpret_cast<SkPoint*>(vertex);
        position->set(positions.fLeft, positions.fBottom);
        vertex += vertexStride;

        // V2
        position = reinterpret_cast<SkPoint*>(vertex);
        position->set(positions.fRight, positions.fBottom);
        vertex += vertexStride;

        // V3
        position = reinterpret_cast<SkPoint*>(vertex);
        position->set(positions.fRight, positions.fTop);
    }
    subRun->appendVertices(vertexStride);
    fGlyphs[subRun->glyphEndIndex()] = glyph;
    subRun->glyphAppended();
}

 bool onClick(Click* click) override {
     fCenter.set(click->fCurr.fX, click->fCurr.fY);
     this->inval(NULL);
     return false;
 }

void Font::drawGlyphs(GraphicsContext* graphicsContext,
                      const SimpleFontData* font,
                      const GlyphBuffer& glyphBuffer,
                      int from,
                      int numGlyphs,
                      const FloatPoint& point,
                      const FloatRect& textRect) const
{
    SkColor color = graphicsContext->effectiveFillColor();
    unsigned char alpha = SkColorGetA(color);
    // Skip 100% transparent text; no need to draw anything.
    if (!alpha && graphicsContext->strokeStyle() == NoStroke && !graphicsContext->hasShadow())
        return;

    // We draw the glyphs in chunks to avoid having to do a heap allocation for
    // the arrays of characters and advances.
    const int kMaxBufferLength = 256;
    Vector<int, kMaxBufferLength> advances;
    int glyphIndex = 0;  // The starting glyph of the current chunk.

    float horizontalOffset = point.x(); // The floating point offset of the left side of the current glyph.

#if ENABLE(OPENTYPE_VERTICAL)
    const OpenTypeVerticalData* verticalData = font->verticalData();
    if (verticalData) {
        Vector<FloatPoint, kMaxBufferLength> translations;
        Vector<GOFFSET, kMaxBufferLength> offsets;

        // Skia doesn't have matrix for glyph coordinate space, so we rotate back the CTM.
        AffineTransform savedMatrix = graphicsContext->getCTM();
        graphicsContext->concatCTM(AffineTransform(0, -1, 1, 0, point.x(), point.y()));
        graphicsContext->concatCTM(AffineTransform(1, 0, 0, 1, -point.x(), -point.y()));

        const FontMetrics& metrics = font->fontMetrics();
        SkScalar verticalOriginX = SkFloatToScalar(point.x() + metrics.floatAscent() - metrics.floatAscent(IdeographicBaseline));
        while (glyphIndex < numGlyphs) {
            // How many chars will be in this chunk?
            int curLen = std::min(kMaxBufferLength, numGlyphs - glyphIndex);

            const Glyph* glyphs = glyphBuffer.glyphs(from + glyphIndex);
            translations.resize(curLen);
            verticalData->getVerticalTranslationsForGlyphs(font, &glyphs[0], curLen, reinterpret_cast<float*>(&translations[0]));
            // To position glyphs vertically, we use offsets instead of advances.
            advances.resize(curLen);
            advances.fill(0);
            offsets.resize(curLen);
            float currentWidth = 0;
            for (int i = 0; i < curLen; ++i, ++glyphIndex) {
                offsets[i].du = lroundf(translations[i].x());
                offsets[i].dv = -lroundf(currentWidth - translations[i].y());
                currentWidth += glyphBuffer.advanceAt(from + glyphIndex);
            }
            SkPoint origin;
            origin.set(verticalOriginX, SkFloatToScalar(point.y() + horizontalOffset - point.x()));
            horizontalOffset += currentWidth;
            paintSkiaText(graphicsContext, font->platformData(), curLen, &glyphs[0], &advances[0], &offsets[0], origin, SkRect(textRect));
        }

        graphicsContext->setCTM(savedMatrix);
        return;
    }
#endif

    // In order to round all offsets to the correct pixel boundary, this code keeps track of the absolute position
    // of each glyph in floating point units and rounds to integer advances at the last possible moment.

    int lastHorizontalOffsetRounded = lroundf(horizontalOffset); // The rounded offset of the left side of the last glyph rendered.
    Vector<WORD, kMaxBufferLength> glyphs;
    while (glyphIndex < numGlyphs) {
        // How many chars will be in this chunk?
        int curLen = std::min(kMaxBufferLength, numGlyphs - glyphIndex);
        glyphs.resize(curLen);
        advances.resize(curLen);

        float currentWidth = 0;
        for (int i = 0; i < curLen; ++i, ++glyphIndex) {
            glyphs[i] = glyphBuffer.glyphAt(from + glyphIndex);
            horizontalOffset += glyphBuffer.advanceAt(from + glyphIndex);
            advances[i] = lroundf(horizontalOffset) - lastHorizontalOffsetRounded;
            lastHorizontalOffsetRounded += advances[i];
            currentWidth += glyphBuffer.advanceAt(from + glyphIndex);

            // Bug 26088 - very large positive or negative runs can fail to
            // render so we clamp the size here. In the specs, negative
            // letter-spacing is implementation-defined, so this should be
            // fine, and it matches Safari's implementation. The call actually
            // seems to crash if kMaxNegativeRun is set to somewhere around
            // -32830, so we give ourselves a little breathing room.
            const int maxNegativeRun = -32768;
            const int maxPositiveRun =  32768;
            if ((currentWidth + advances[i] < maxNegativeRun) || (currentWidth + advances[i] > maxPositiveRun))
                advances[i] = 0;
        }

        SkPoint origin = point;
        origin.fX += SkFloatToScalar(horizontalOffset - point.x() - currentWidth);
        paintSkiaText(graphicsContext, font->platformData(), curLen, &glyphs[0], &advances[0], 0, origin, SkRect(textRect));
    }
}

//      midPt sets the first argument to be the midpoint of the other two
//      it is used by quadApprox
static inline void midPt(SkPoint& dest,const SkPoint& a,const SkPoint& b)
{
    dest.set(SkScalarAve(a.fX, b.fX),SkScalarAve(a.fY, b.fY));
}

// Returns true if this method handled the glyph, false if needs to be passed to fallback
//
bool GrDistanceFieldTextContext::appendGlyph(GrGlyph::PackedID packed,
                                             SkScalar sx, SkScalar sy,
                                             GrFontScaler* scaler) {
    if (NULL == fDrawTarget) {
        return true;
    }

    if (NULL == fStrike) {
        fStrike = fContext->getFontCache()->getStrike(scaler, true);
    }

    GrGlyph* glyph = fStrike->getGlyph(packed, scaler);
    if (NULL == glyph || glyph->fBounds.isEmpty()) {
        return true;
    }

    // fallback to color glyph support
    if (kA8_GrMaskFormat != glyph->fMaskFormat) {
        return false;
    }

    SkScalar dx = SkIntToScalar(glyph->fBounds.fLeft + SK_DistanceFieldInset);
    SkScalar dy = SkIntToScalar(glyph->fBounds.fTop + SK_DistanceFieldInset);
    SkScalar width = SkIntToScalar(glyph->fBounds.width() - 2*SK_DistanceFieldInset);
    SkScalar height = SkIntToScalar(glyph->fBounds.height() - 2*SK_DistanceFieldInset);

    SkScalar scale = fTextRatio;
    dx *= scale;
    dy *= scale;
    sx += dx;
    sy += dy;
    width *= scale;
    height *= scale;
    SkRect glyphRect = SkRect::MakeXYWH(sx, sy, width, height);

    // check if we clipped out
    SkRect dstRect;
    const SkMatrix& ctm = fViewMatrix;
    (void) ctm.mapRect(&dstRect, glyphRect);
    if (fClipRect.quickReject(SkScalarTruncToInt(dstRect.left()),
                              SkScalarTruncToInt(dstRect.top()),
                              SkScalarTruncToInt(dstRect.right()),
                              SkScalarTruncToInt(dstRect.bottom()))) {
        return true;
    }

    if (NULL == glyph->fPlot) {
        // needs to be a separate conditional to avoid over-optimization
        // on Nexus 7 and Nexus 10

        // If the glyph is too large we fall back to paths
        if (!uploadGlyph(glyph, scaler)) {
            if (NULL == glyph->fPath) {
                SkPath* path = SkNEW(SkPath);
                if (!scaler->getGlyphPath(glyph->glyphID(), path)) {
                    // flag the glyph as being dead?
                    delete path;
                    return true;
                }
                glyph->fPath = path;
            }

            // flush any accumulated draws before drawing this glyph as a path.
            this->flush();

            SkMatrix ctm;
            ctm.setScale(fTextRatio, fTextRatio);
            ctm.postTranslate(sx - dx, sy - dy);

            SkPath tmpPath(*glyph->fPath);
            tmpPath.transform(ctm);

            GrStrokeInfo strokeInfo(SkStrokeRec::kFill_InitStyle);
            fContext->drawPath(fRenderTarget, fClip, fPaint, fViewMatrix, tmpPath, strokeInfo);

            // remove this glyph from the vertices we need to allocate
            fTotalVertexCount -= kVerticesPerGlyph;
            return true;
        }
    }

    SkASSERT(glyph->fPlot);
    GrDrawTarget::DrawToken drawToken = fDrawTarget->getCurrentDrawToken();
    glyph->fPlot->setDrawToken(drawToken);

    GrTexture* texture = glyph->fPlot->texture();
    SkASSERT(texture);

    if (fCurrTexture != texture || fCurrVertex + kVerticesPerGlyph > fTotalVertexCount) {
        this->flush();
        fCurrTexture = texture;
        fCurrTexture->ref();
    }

    bool useColorVerts = !fUseLCDText;

    if (NULL == fVertices) {
        int maxQuadVertices = kVerticesPerGlyph * fContext->getQuadIndexBuffer()->maxQuads();
//.........这里部分代码省略.........

GrTexture* GaussianBlur(GrContext* context,
                        GrTexture* srcTexture,
                        bool canClobberSrc,
                        const SkRect& dstBounds,
                        const SkRect* srcBounds,
                        float sigmaX,
                        float sigmaY,
                        GrTextureProvider::SizeConstraint constraint) {
    SkASSERT(context);
    SkIRect clearRect;
    int scaleFactorX, radiusX;
    int scaleFactorY, radiusY;
    int maxTextureSize = context->caps()->maxTextureSize();
    sigmaX = adjust_sigma(sigmaX, maxTextureSize, &scaleFactorX, &radiusX);
    sigmaY = adjust_sigma(sigmaY, maxTextureSize, &scaleFactorY, &radiusY);

    SkPoint srcOffset = SkPoint::Make(-dstBounds.x(), -dstBounds.y());
    SkRect localDstBounds = SkRect::MakeWH(dstBounds.width(), dstBounds.height());
    SkRect localSrcBounds;
    SkRect srcRect;
    if (srcBounds) {
        srcRect = localSrcBounds = *srcBounds;
        srcRect.offset(srcOffset);
        srcBounds = &localSrcBounds;
    } else {
        srcRect = localDstBounds;
    }

    scale_rect(&srcRect, 1.0f / scaleFactorX, 1.0f / scaleFactorY);
    srcRect.roundOut(&srcRect);
    scale_rect(&srcRect, static_cast<float>(scaleFactorX),
                         static_cast<float>(scaleFactorY));

    // setup new clip
    GrClip clip(localDstBounds);

    SkASSERT(kBGRA_8888_GrPixelConfig == srcTexture->config() ||
             kRGBA_8888_GrPixelConfig == srcTexture->config() ||
             kAlpha_8_GrPixelConfig == srcTexture->config());

    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = SkScalarFloorToInt(dstBounds.width());
    desc.fHeight = SkScalarFloorToInt(dstBounds.height());
    desc.fConfig = srcTexture->config();

    GrTexture* dstTexture;
    GrTexture* tempTexture;
    SkAutoTUnref<GrTexture> temp1, temp2;

    temp1.reset(context->textureProvider()->createTexture(desc, constraint));
    dstTexture = temp1.get();
    if (canClobberSrc) {
        tempTexture = srcTexture;
    } else {
        temp2.reset(context->textureProvider()->createTexture(desc, constraint));
        tempTexture = temp2.get();
    }

    if (nullptr == dstTexture || nullptr == tempTexture) {
        return nullptr;
    }

    SkAutoTUnref<GrDrawContext> srcDrawContext;

    for (int i = 1; i < scaleFactorX || i < scaleFactorY; i *= 2) {
        GrPaint paint;
        SkMatrix matrix;
        matrix.setIDiv(srcTexture->width(), srcTexture->height());
        SkRect dstRect(srcRect);
        if (srcBounds && i == 1) {
            SkRect domain;
            matrix.mapRect(&domain, *srcBounds);
            domain.inset((i < scaleFactorX) ? SK_ScalarHalf / srcTexture->width() : 0.0f,
                         (i < scaleFactorY) ? SK_ScalarHalf / srcTexture->height() : 0.0f);
            SkAutoTUnref<const GrFragmentProcessor> fp(GrTextureDomainEffect::Create(
                srcTexture,
                matrix,
                domain,
                GrTextureDomain::kDecal_Mode,
                GrTextureParams::kBilerp_FilterMode));
            paint.addColorFragmentProcessor(fp);
            srcRect.offset(-srcOffset);
            srcOffset.set(0, 0);
        } else {
            GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
            paint.addColorTextureProcessor(srcTexture, matrix, params);
        }
        paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
        scale_rect(&dstRect, i < scaleFactorX ? 0.5f : 1.0f,
                             i < scaleFactorY ? 0.5f : 1.0f);

        SkAutoTUnref<GrDrawContext> dstDrawContext(
                                             context->drawContext(dstTexture->asRenderTarget()));
        if (!dstDrawContext) {
            return nullptr;
        }
        dstDrawContext->fillRectToRect(clip, paint, SkMatrix::I(), dstRect, srcRect);

        srcDrawContext.swap(dstDrawContext);
//.........这里部分代码省略.........