C++ SkPaint::setFilterLevel方法代码示例

    virtual void onDrawContent(SkCanvas* canvas) {
        SkRect srcR;
        srcR.set(fSrcPts[0], fSrcPts[1]);
        srcR = SkRect::MakeXYWH(fSrcPts[0].fX, fSrcPts[0].fY, 32, 32);
        srcR.offset(-srcR.width()/2, -srcR.height()/2);

        SkPaint paint;
        paint.setStyle(SkPaint::kStroke_Style);
        paint.setColor(SK_ColorYELLOW);

        SkBitmap bitmap;
        make_bitmap(&bitmap);

        canvas->translate(20, 20);

        canvas->drawBitmap(bitmap, 0, 0, &paint);
        canvas->drawRect(srcR, paint);

        for (int i = 0; i < 2; ++i) {
            paint.setFilterLevel(1 == i ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
            canvas->drawBitmapRectToRect(bitmap, &srcR, fDstR[i], &paint);
            canvas->drawRect(fDstR[i], paint);
        }

        this->bounce();
        this->inval(NULL);
    }

    virtual void onDraw(SkCanvas* canvas) {
        SkBitmap bm;
        SkIRect center;
        make_bitmap(&bm, &center);

        // amount of bm that should not be stretched (unless we have to)
        const SkScalar fixed = SkIntToScalar(bm.width() - center.width());

        const SkTSize<SkScalar> size[] = {
            { fixed * 4 / 5, fixed * 4 / 5 },   // shrink in both axes
            { fixed * 4 / 5, fixed * 4 },       // shrink in X
            { fixed * 4,     fixed * 4 / 5 },   // shrink in Y
            { fixed * 4,     fixed * 4 }
        };

        canvas->drawBitmap(bm, SkIntToScalar(10), SkIntToScalar(10), NULL);

        SkScalar x = SkIntToScalar(100);
        SkScalar y = SkIntToScalar(100);

        SkPaint paint;
        paint.setFilterLevel(SkPaint::kLow_FilterLevel);

        for (int iy = 0; iy < 2; ++iy) {
            for (int ix = 0; ix < 2; ++ix) {
                int i = ix * 2 + iy;
                SkRect r = SkRect::MakeXYWH(x + ix * fixed, y + iy * fixed,
                                            size[i].width(), size[i].height());
                canvas->drawBitmapNine(bm, center, r, &paint);
            }
        }
    }

    virtual void onDrawContent(SkCanvas* canvas) {
        canvas->translate(this->width()/2, this->height()/2);

        Sk3DView    view;
        view.rotateX(fRX);
        view.rotateY(fRY);
        view.applyToCanvas(canvas);

        SkPaint paint;
        if (fShaders.count() > 0) {
            bool frontFace = view.dotWithNormal(0, 0, SK_Scalar1) < 0;
            if (frontFace != fFrontFace) {
                fFrontFace = frontFace;
                fShaderIndex = (fShaderIndex + 1) % fShaders.count();
            }

            paint.setAntiAlias(true);
            paint.setShader(fShaders[fShaderIndex]);
            paint.setFilterLevel(SkPaint::kLow_FilterLevel);
            SkRect r = { -150, -150, 150, 150 };
            canvas->drawRoundRect(r, 30, 30, paint);
        }

        fRY += SampleCode::GetAnimSecondsDelta() * 90;
        if (fRY >= SkIntToScalar(360)) {
            fRY = 0;
        }
        this->inval(NULL);
    }

    virtual void onDraw(SkCanvas* canvas) {
        SkMatrix m;
        m.reset();
        m.setRotate(33 * SK_Scalar1);
        m.postScale(3000 * SK_Scalar1, 3000 * SK_Scalar1);
        m.postTranslate(6000 * SK_Scalar1, -5000 * SK_Scalar1);
        canvas->concat(m);

        SkPaint paint;
        paint.setColor(SK_ColorRED);
        paint.setAntiAlias(true);

        bool success = m.invert(&m);
        SkASSERT(success);
        (void) success; // silence compiler :(

        SkPath path;

        SkPoint pt = {10 * SK_Scalar1, 10 * SK_Scalar1};
        SkScalar small = 1 / (500 * SK_Scalar1);

        m.mapPoints(&pt, 1);
        path.addCircle(pt.fX, pt.fY, small);
        canvas->drawPath(path, paint);

        pt.set(30 * SK_Scalar1, 10 * SK_Scalar1);
        m.mapPoints(&pt, 1);
        SkRect rect = {pt.fX - small, pt.fY - small,
                       pt.fX + small, pt.fY + small};
        canvas->drawRect(rect, paint);

        SkBitmap bmp;
        bmp.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
        bmp.allocPixels();
        bmp.lockPixels();
        uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels());
        pixels[0] = SkPackARGB32(0xFF, 0xFF, 0x00, 0x00);
        pixels[1] = SkPackARGB32(0xFF, 0x00, 0xFF, 0x00);
        pixels[2] = SkPackARGB32(0x80, 0x00, 0x00, 0x00);
        pixels[3] = SkPackARGB32(0xFF, 0x00, 0x00, 0xFF);
        bmp.unlockPixels();
        pt.set(30 * SK_Scalar1, 30 * SK_Scalar1);
        m.mapPoints(&pt, 1);
        SkShader* shader = SkShader::CreateBitmapShader(
                                            bmp,
                                            SkShader::kRepeat_TileMode,
                                            SkShader::kRepeat_TileMode);
        SkMatrix s;
        s.reset();
        s.setScale(SK_Scalar1 / 1000, SK_Scalar1 / 1000);
        shader->setLocalMatrix(s);
        paint.setShader(shader)->unref();
        paint.setAntiAlias(false);
        paint.setFilterLevel(SkPaint::kLow_FilterLevel);
        rect.setLTRB(pt.fX - small, pt.fY - small,
                     pt.fX + small, pt.fY + small);
        canvas->drawRect(rect, paint);
    }

    virtual void onDrawContent(SkCanvas* canvas) {
        SkIRect srcRect;
        SkRect dstRect;
        SkPaint paint;
        paint.setFilterLevel(SkPaint::kLow_FilterLevel);

        // Test that bitmap draws from malloc-backed bitmaps respect
        // the constrained texture domain.
        srcRect.setXYWH(1, 1, 3, 3);
        dstRect.setXYWH(5.0f, 5.0f, 305.0f, 305.0f);
        canvas->drawBitmapRect(fBM, &srcRect, dstRect, &paint);

        // Test that bitmap draws across separate devices also respect
        // the constrainted texture domain.
        // Note:  GPU-backed bitmaps follow a different rendering path
        // when copying from one GPU device to another.
        SkAutoTUnref<SkBaseDevice> secondDevice(canvas->createCompatibleDevice(
                SkBitmap::kARGB_8888_Config, 5, 5, true));
        SkCanvas secondCanvas(secondDevice.get());

        srcRect.setXYWH(1, 1, 3, 3);
        dstRect.setXYWH(1.0f, 1.0f, 3.0f, 3.0f);
        secondCanvas.drawBitmapRect(fBM, &srcRect, dstRect, &paint);

        SkBitmap deviceBitmap = secondDevice->accessBitmap(false);

        srcRect.setXYWH(1, 1, 3, 3);
        dstRect.setXYWH(405.0f, 5.0f, 305.0f, 305.0f);
        canvas->drawBitmapRect(deviceBitmap, &srcRect, dstRect, &paint);

        // Test that bitmap blurring using a subrect
        // renders correctly
        srcRect.setXYWH(1, 1, 3, 3);
        dstRect.setXYWH(5.0f, 405.0f, 305.0f, 305.0f);
        SkMaskFilter* mf = SkBlurMaskFilter::Create(
            SkBlurMaskFilter::kNormal_BlurStyle,
            SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5)),
            SkBlurMaskFilter::kHighQuality_BlurFlag |
            SkBlurMaskFilter::kIgnoreTransform_BlurFlag);
        paint.setMaskFilter(mf)->unref();
        canvas->drawBitmapRect(deviceBitmap, &srcRect, dstRect, &paint);

        // Blur and a rotation + NULL src rect
        // This should not trigger the texture domain code
        // but it will test a code path in SkGpuDevice::drawBitmap
        // that handles blurs with rects transformed to non-
        // orthogonal rects. It also tests the NULL src rect handling
    mf = SkBlurMaskFilter::Create(
            SkBlurMaskFilter::kNormal_BlurStyle,
            SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5)),
            SkBlurMaskFilter::kHighQuality_BlurFlag);
        paint.setMaskFilter(mf)->unref();

        dstRect.setXYWH(-150.0f, -150.0f, 300.0f, 300.0f);
        canvas->translate(550, 550);
        canvas->rotate(45);
        canvas->drawBitmapRect(fBM, NULL, dstRect, &paint);
    }

static void draw_row(SkCanvas* canvas, const SkBitmap& bm, const SkMatrix& mat, SkScalar dx) {
    SkPaint paint;

    SkAutoCanvasRestore acr(canvas, true);

    canvas->drawBitmapMatrix(bm, mat, &paint);

    paint.setFilterLevel(SkPaint::kLow_FilterLevel);
    canvas->translate(dx, 0);
    canvas->drawBitmapMatrix(bm, mat, &paint);

    paint.setFilterLevel(SkPaint::kMedium_FilterLevel);
    canvas->translate(dx, 0);
    canvas->drawBitmapMatrix(bm, mat, &paint);

    paint.setFilterLevel(SkPaint::kHigh_FilterLevel);
    canvas->translate(dx, 0);
    canvas->drawBitmapMatrix(bm, mat, &paint);
}

void Panel::OnDraw(SkCanvas* canvas, const SkRect& clip_rect) {
    SkPaint paint;
    paint.setFilterLevel(SkPaint::kMedium_FilterLevel);
    SkRect rect = SkRect::MakeXYWH(
        SkIntToScalar(0), SkIntToScalar(0),
        SkIntToScalar(Width()), SkIntToScalar(Height()));

    auto bitmaps = Bitmap();
    !bitmaps.empty() ? GetRenderTactics()->Draw(canvas, bitmaps[0], rect, paint) :
        canvas->clear(SK_AlphaTRANSPARENT);
}

bool SkDownSampleImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src,
                                            const Context&,
                                            SkBitmap* result, SkIPoint*) const {
    SkScalar scale = fScale;
    if (scale > SK_Scalar1 || scale <= 0) {
        return false;
    }

    int dstW = SkScalarRoundToInt(src.width() * scale);
    int dstH = SkScalarRoundToInt(src.height() * scale);
    if (dstW < 1) {
        dstW = 1;
    }
    if (dstH < 1) {
        dstH = 1;
    }

    SkBitmap tmp;

    // downsample
    {
        SkBaseDevice* dev = proxy->createDevice(dstW, dstH);
        if (NULL == dev) {
            return false;
        }
        OwnDeviceCanvas canvas(dev);
        SkPaint paint;

        paint.setFilterLevel(SkPaint::kLow_FilterLevel);
        canvas.scale(scale, scale);
        canvas.drawBitmap(src, 0, 0, &paint);
        tmp = dev->accessBitmap(false);
    }

    // upscale
    {
        SkBaseDevice* dev = proxy->createDevice(src.width(), src.height());
        if (NULL == dev) {
            return false;
        }
        OwnDeviceCanvas canvas(dev);

        SkRect r = SkRect::MakeWH(SkIntToScalar(src.width()),
                                  SkIntToScalar(src.height()));
        canvas.drawBitmapRect(tmp, NULL, r, NULL);
        *result = dev->accessBitmap(false);
    }
    return true;
}

    // Draw ~1/4 of the large bitmap
    void drawCase3(SkCanvas* canvas, int transX, int transY,
                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
        SkRect src = SkRect::MakeXYWH(2, 2,
                                      SkIntToScalar(fBitmapBig.width()/2-2),
                                      SkIntToScalar(fBitmapBig.height()/2-2));
        SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));

        SkPaint paint;
        paint.setFilterLevel(filter);

        canvas->save();
        canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
        canvas->drawBitmapRectToRect(fBitmapBig, &src, dst, &paint, flags);
        canvas->restore();
    }

    virtual void onDrawContent(SkCanvas* canvas) {
        canvas->translate(SkIntToScalar(10), SkIntToScalar(50));

        const SkScalar W = SkIntToScalar(fBitmaps[0].width() + 1);
        const SkScalar H = SkIntToScalar(fBitmaps[0].height() + 1);
        SkPaint paint;

        const SkScalar scale = 0.897917f;
        canvas->scale(SK_Scalar1, scale);

        for (int k = 0; k < 2; k++) {
            paint.setFilterLevel(k == 1 ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
            for (int j = 0; j < 2; j++) {
                paint.setDither(j == 1);
                for (int i = 0; i < fBitmapCount; i++) {
                    SkScalar x = (k * fBitmapCount + j) * W;
                    SkScalar y = i * H;
                    x = SkScalarRoundToScalar(x);
                    y = SkScalarRoundToScalar(y);
                    canvas->drawBitmap(fBitmaps[i], x, y, &paint);
                    if (i == 0) {
                        SkPaint p;
                        p.setAntiAlias(true);
                        p.setTextAlign(SkPaint::kCenter_Align);
                        p.setTextSize(SkIntToScalar(18));
                        SkString s("dither=");
                        s.appendS32(paint.isDither());
                        s.append(" filter=");
                        s.appendS32(paint.getFilterLevel() != SkPaint::kNone_FilterLevel);
                        canvas->drawText(s.c_str(), s.size(), x + W/2,
                                         y - p.getTextSize(), p);
                    }
                    if (k+j == 2) {
                        SkPaint p;
                        p.setAntiAlias(true);
                        p.setTextSize(SkIntToScalar(18));
                        SkString s;
                        s.append(" depth=");
                        s.appendS32(fBitmaps[i].colorType() == kRGB_565_SkColorType ? 16 : 32);
                        canvas->drawText(s.c_str(), s.size(), x + W + SkIntToScalar(4),
                                         y + H/2, p);
                    }
                }
            }
        }
    }

static void mesh_slide(SkCanvas* canvas) {
    Rec fRecs[3];
    SkIPoint    size;

    SkShader* fShader0 = make_shader0(&size);
    SkShader* fShader1 = make_shader1(size);

    SkAutoUnref aur0(fShader0);
    SkAutoUnref aur1(fShader1);

    make_strip(&fRecs[0], size.fX, size.fY);
    make_fan(&fRecs[1], size.fX, size.fY);
    make_tris(&fRecs[2]);

    SkPaint paint;
    paint.setDither(true);
    paint.setFilterLevel(SkPaint::kLow_FilterLevel);

    for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) {
        canvas->save();

        paint.setShader(NULL);
        canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
                             fRecs[i].fVerts, fRecs[i].fTexs,
                             NULL, NULL, NULL, 0, paint);

        canvas->translate(SkIntToScalar(210), 0);

        paint.setShader(fShader0);
        canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
                             fRecs[i].fVerts, fRecs[i].fTexs,
                             NULL, NULL, NULL, 0, paint);

        canvas->translate(SkIntToScalar(210), 0);

        paint.setShader(fShader1);
        canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
                             fRecs[i].fVerts, fRecs[i].fTexs,
                             NULL, NULL, NULL, 0, paint);
        canvas->restore();

        canvas->translate(0, SkIntToScalar(250));
    }
}

bool SkMatrixImageFilter::onFilterImage(Proxy* proxy,
                                        const SkBitmap& source,
                                        const Context& ctx,
                                        SkBitmap* result,
                                        SkIPoint* offset) const {
    SkBitmap src = source;
    SkIPoint srcOffset = SkIPoint::Make(0, 0);
    if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) {
        return false;
    }

    SkRect dstRect;
    SkIRect srcBounds, dstBounds;
    src.getBounds(&srcBounds);
    srcBounds.offset(srcOffset);
    SkRect srcRect = SkRect::Make(srcBounds);
    SkMatrix matrix;
    if (!ctx.ctm().invert(&matrix)) {
        return false;
    }
    matrix.postConcat(fTransform);
    matrix.postConcat(ctx.ctm());
    matrix.mapRect(&dstRect, srcRect);
    dstRect.roundOut(&dstBounds);

    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstBounds.width(), dstBounds.height()));
    if (NULL == device.get()) {
        return false;
    }

    SkCanvas canvas(device.get());
    canvas.translate(-SkIntToScalar(dstBounds.x()), -SkIntToScalar(dstBounds.y()));
    canvas.concat(matrix);
    SkPaint paint;

    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
    paint.setFilterLevel(fFilterLevel);
    canvas.drawBitmap(src, srcRect.x(), srcRect.y(), &paint);

    *result = device.get()->accessBitmap(false);
    offset->fX = dstBounds.fLeft;
    offset->fY = dstBounds.fTop;
    return true;
}

static void
Transform(DataSourceSurface* aDest,
          DataSourceSurface* aSource,
          const gfx3DMatrix& aTransform,
          const Point& aDestOffset)
{
  if (aTransform.IsSingular()) {
    return;
  }

  IntSize destSize = aDest->GetSize();
  SkImageInfo destInfo = SkImageInfo::Make(destSize.width,
                                           destSize.height,
                                           kBGRA_8888_SkColorType,
                                           kPremul_SkAlphaType);
  SkBitmap destBitmap;
  destBitmap.setInfo(destInfo, aDest->Stride());
  destBitmap.setPixels((uint32_t*)aDest->GetData());
  SkCanvas destCanvas(destBitmap);

  IntSize srcSize = aSource->GetSize();
  SkImageInfo srcInfo = SkImageInfo::Make(srcSize.width,
                                          srcSize.height,
                                          kBGRA_8888_SkColorType,
                                          kPremul_SkAlphaType);
  SkBitmap src;
  src.setInfo(srcInfo, aSource->Stride());
  src.setPixels((uint32_t*)aSource->GetData());

  gfx3DMatrix transform = aTransform;
  transform.TranslatePost(Point3D(-aDestOffset.x, -aDestOffset.y, 0));
  destCanvas.setMatrix(Matrix3DToSkia(transform));

  SkPaint paint;
  paint.setXfermodeMode(SkXfermode::kSrc_Mode);
  paint.setAntiAlias(true);
  paint.setFilterLevel(SkPaint::kLow_FilterLevel);
  SkRect destRect = SkRect::MakeXYWH(0, 0, srcSize.width, srcSize.height);
  destCanvas.drawBitmapRectToRect(src, nullptr, destRect, &paint);
}

static void
SetPaintPattern(SkPaint& aPaint, const Pattern& aPattern, TempBitmap& aTmpBitmap,
                Float aAlpha = 1.0)
{
  switch (aPattern.GetType()) {
    case PatternType::COLOR: {
      Color color = static_cast<const ColorPattern&>(aPattern).mColor;
      aPaint.setColor(ColorToSkColor(color, aAlpha));
      break;
    }
    case PatternType::LINEAR_GRADIENT: {
      const LinearGradientPattern& pat = static_cast<const LinearGradientPattern&>(aPattern);
      GradientStopsSkia *stops = static_cast<GradientStopsSkia*>(pat.mStops.get());
      SkShader::TileMode mode = ExtendModeToTileMode(stops->mExtendMode);

      if (stops->mCount >= 2) {
        SkPoint points[2];
        points[0] = SkPoint::Make(SkFloatToScalar(pat.mBegin.x), SkFloatToScalar(pat.mBegin.y));
        points[1] = SkPoint::Make(SkFloatToScalar(pat.mEnd.x), SkFloatToScalar(pat.mEnd.y));

        SkShader* shader = SkGradientShader::CreateLinear(points, 
                                                          &stops->mColors.front(), 
                                                          &stops->mPositions.front(), 
                                                          stops->mCount, 
                                                          mode);

        if (shader) {
            SkMatrix mat;
            GfxMatrixToSkiaMatrix(pat.mMatrix, mat);
            shader->setLocalMatrix(mat);
            SkSafeUnref(aPaint.setShader(shader));
        }

      } else {
        aPaint.setColor(SkColorSetARGB(0, 0, 0, 0));
      }
      break;
    }
    case PatternType::RADIAL_GRADIENT: {
      const RadialGradientPattern& pat = static_cast<const RadialGradientPattern&>(aPattern);
      GradientStopsSkia *stops = static_cast<GradientStopsSkia*>(pat.mStops.get());
      SkShader::TileMode mode = ExtendModeToTileMode(stops->mExtendMode);

      if (stops->mCount >= 2) {
        SkPoint points[2];
        points[0] = SkPoint::Make(SkFloatToScalar(pat.mCenter1.x), SkFloatToScalar(pat.mCenter1.y));
        points[1] = SkPoint::Make(SkFloatToScalar(pat.mCenter2.x), SkFloatToScalar(pat.mCenter2.y));

        SkShader* shader = SkGradientShader::CreateTwoPointConical(points[0], 
                                                                   SkFloatToScalar(pat.mRadius1),
                                                                   points[1], 
                                                                   SkFloatToScalar(pat.mRadius2),
                                                                   &stops->mColors.front(), 
                                                                   &stops->mPositions.front(), 
                                                                   stops->mCount, 
                                                                   mode);
        if (shader) {
            SkMatrix mat;
            GfxMatrixToSkiaMatrix(pat.mMatrix, mat);
            shader->setLocalMatrix(mat);
            SkSafeUnref(aPaint.setShader(shader));
        }

      } else {
        aPaint.setColor(SkColorSetARGB(0, 0, 0, 0));
      }
      break;
    }
    case PatternType::SURFACE: {
      const SurfacePattern& pat = static_cast<const SurfacePattern&>(aPattern);
      aTmpBitmap = GetBitmapForSurface(pat.mSurface);
      const SkBitmap& bitmap = aTmpBitmap.mBitmap;

      SkShader::TileMode mode = ExtendModeToTileMode(pat.mExtendMode);
      SkShader* shader = SkShader::CreateBitmapShader(bitmap, mode, mode);
      SkMatrix mat;
      GfxMatrixToSkiaMatrix(pat.mMatrix, mat);
      shader->setLocalMatrix(mat);
      SkSafeUnref(aPaint.setShader(shader));
      if (pat.mFilter == Filter::POINT) {
        aPaint.setFilterLevel(SkPaint::kNone_FilterLevel);
      }
      break;
    }
  }
}

//.........这里部分代码省略.........
    FloatRect normSrcRect = floatSrcRect;
    normSrcRect.intersect(FloatRect(0, 0, bitmap().width(), bitmap().height()));
    if (destRect.isEmpty() || normSrcRect.isEmpty())
        return; // nothing to draw

    SkMatrix totalMatrix = context->getTotalMatrix();
    SkScalar ctmScaleX = totalMatrix.getScaleX();
    SkScalar ctmScaleY = totalMatrix.getScaleY();
    totalMatrix.preScale(scale.width(), scale.height());

    // Figure out what size the bitmap will be in the destination. The
    // destination rect is the bounds of the pattern, we need to use the
    // matrix to see how big it will be.
    SkRect destRectTarget;
    totalMatrix.mapRect(&destRectTarget, normSrcRect);

    float destBitmapWidth = SkScalarToFloat(destRectTarget.width());
    float destBitmapHeight = SkScalarToFloat(destRectTarget.height());

    // Compute the resampling mode.
    ResamplingMode resampling;
    if (context->isAccelerated() || context->printing())
        resampling = LinearResampling;
    else
        resampling = computeResamplingMode(totalMatrix, normSrcRect.width(), normSrcRect.height(), destBitmapWidth, destBitmapHeight);
    resampling = limitResamplingMode(context, resampling);

    SkMatrix shaderTransform;
    RefPtr<SkShader> shader;

    bool isLazyDecoded = DeferredImageDecoder::isLazyDecoded(bitmap());
    // Bicubic filter is only applied to defer-decoded images, see
    // NativeImageSkia::draw for details.
    bool useBicubicFilter = resampling == AwesomeResampling && isLazyDecoded;

    if (resampling == AwesomeResampling && !useBicubicFilter) {
        // Do nice resampling.
        float scaleX = destBitmapWidth / normSrcRect.width();
        float scaleY = destBitmapHeight / normSrcRect.height();
        SkRect scaledSrcRect;

        // The image fragment generated here is not exactly what is
        // requested. The scale factor used is approximated and image
        // fragment is slightly larger to align to integer
        // boundaries.
        SkBitmap resampled = extractScaledImageFragment(normSrcRect, scaleX, scaleY, &scaledSrcRect);
        if (repeatSpacing.isZero()) {
            shader = adoptRef(SkShader::CreateBitmapShader(resampled, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode));
        } else {
            shader = adoptRef(SkShader::CreateBitmapShader(
                createBitmapWithSpace(resampled, repeatSpacing.width() * ctmScaleX, repeatSpacing.height() * ctmScaleY),
                SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode));
        }

        // Since we just resized the bitmap, we need to remove the scale
        // applied to the pixels in the bitmap shader. This means we need
        // CTM * shaderTransform to have identity scale. Since we
        // can't modify CTM (or the rectangle will be drawn in the wrong
        // place), we must set shaderTransform's scale to the inverse of
        // CTM scale.
        shaderTransform.setScale(ctmScaleX ? 1 / ctmScaleX : 1, ctmScaleY ? 1 / ctmScaleY : 1);
    } else {
        // No need to resample before drawing.
        SkBitmap srcSubset;
        bitmap().extractSubset(&srcSubset, enclosingIntRect(normSrcRect));
        if (repeatSpacing.isZero()) {
            shader = adoptRef(SkShader::CreateBitmapShader(srcSubset, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode));
        } else {
            shader = adoptRef(SkShader::CreateBitmapShader(
                createBitmapWithSpace(srcSubset, repeatSpacing.width() * ctmScaleX, repeatSpacing.height() * ctmScaleY),
                SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode));
        }

        // Because no resizing occurred, the shader transform should be
        // set to the pattern's transform, which just includes scale.
        shaderTransform.setScale(scale.width(), scale.height());
    }

    // We also need to translate it such that the origin of the pattern is the
    // origin of the destination rect, which is what WebKit expects. Skia uses
    // the coordinate system origin as the base for the pattern. If WebKit wants
    // a shifted image, it will shift it from there using the shaderTransform.
    float adjustedX = phase.x() + normSrcRect.x() * scale.width();
    float adjustedY = phase.y() + normSrcRect.y() * scale.height();
    shaderTransform.postTranslate(SkFloatToScalar(adjustedX), SkFloatToScalar(adjustedY));
    shader->setLocalMatrix(shaderTransform);

    SkPaint paint;
    paint.setShader(shader.get());
    paint.setXfermode(WebCoreCompositeToSkiaComposite(compositeOp, blendMode).get());
    paint.setColorFilter(context->colorFilter());

    paint.setFilterBitmap(resampling == LinearResampling);
    if (useBicubicFilter)
        paint.setFilterLevel(SkPaint::kHigh_FilterLevel);
    if (isLazyDecoded)
        PlatformInstrumentation::didDrawLazyPixelRef(bitmap().getGenerationID());

    context->drawRect(destRect, paint);
}