C++ SkScalarFloorToInt函数代码示例

    virtual void onDraw(SkCanvas* canvas) {
        SkPaint paint;
        this->setupPaint(&paint);

        paint.setAntiAlias(true);

        SkRandom rand;
        for (int i = 0; i < SkBENCHLOOP(3); i++) {
            SkRect r = SkRect::MakeWH(rand.nextUScalar1() * 400,
                                      rand.nextUScalar1() * 400);
            r.offset(fRadius, fRadius);

            if (fRadius > 0) {
                SkMorphologyImageFilter* mf = NULL;
                switch (fStyle) {
                case kDilate_MT:
                    mf = new SkDilateImageFilter(SkScalarFloorToInt(fRadius),
                                                 SkScalarFloorToInt(fRadius));
                    break;
                case kErode_MT:
                    mf = new SkErodeImageFilter(SkScalarFloorToInt(fRadius),
                                                SkScalarFloorToInt(fRadius));
                    break;
                }
                paint.setImageFilter(mf)->unref();
            }
            canvas->drawOval(r, paint);
        }
    }

    void onDraw(int loops, SkCanvas* canvas) override {
        SkPaint paint;
        this->setupPaint(&paint);

        paint.setAntiAlias(true);

        SkRandom rand;
        for (int i = 0; i < loops; i++) {
            SkRect r = SkRect::MakeWH(rand.nextUScalar1() * 400,
                                      rand.nextUScalar1() * 400);
            r.offset(fRadius, fRadius);

            if (fRadius > 0) {
                sk_sp<SkImageFilter> mf;
                switch (fStyle) {
                case kDilate_MT:
                    mf = SkDilateImageFilter::Make(SkScalarFloorToInt(fRadius),
                                                   SkScalarFloorToInt(fRadius),
                                                   nullptr);
                    break;
                case kErode_MT:
                    mf = SkErodeImageFilter::Make(SkScalarFloorToInt(fRadius),
                                                  SkScalarFloorToInt(fRadius),
                                                  nullptr);
                    break;
                }
                paint.setImageFilter(std::move(mf));
            }
            canvas->drawOval(r, paint);
        }
    }

bool TiledPictureRenderer::render(SkBitmap** out) {
    SkASSERT(fPicture != NULL);
    if (NULL == fPicture) {
        return false;
    }

    SkBitmap bitmap;
    if (out){
        *out = SkNEW(SkBitmap);
        setup_bitmap(*out, fPicture->width(), fPicture->height());
        setup_bitmap(&bitmap, fTileWidth, fTileHeight);
    }
    bool success = true;
    for (int i = 0; i < fTileRects.count(); ++i) {
        draw_tile_to_canvas(fCanvas, fTileRects[i], fPicture);
        if (fEnableWrites) {
            success &= write(fCanvas, fWritePath, fMismatchPath, fInputFilename, fJsonSummaryPtr,
                             fUseChecksumBasedFilenames, &i);
        }
        if (NULL != out) {
            if (fCanvas->readPixels(&bitmap, 0, 0)) {
                // Add this tile to the entire bitmap.
                bitmapCopyAtOffset(bitmap, *out, SkScalarFloorToInt(fTileRects[i].left()),
                                   SkScalarFloorToInt(fTileRects[i].top()));
            } else {
                success = false;
            }
        }
    }
    return success;
}

void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
    for (int y = rect.fTop; y < rect.fBottom; ++y) {
        SkPMColor* dptr = result->getAddr32(rect.fLeft, y);
        for (int x = rect.fLeft; x < rect.fRight; ++x) {
            SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0;
            for (int cy = 0; cy < fKernelSize.fHeight; cy++) {
                for (int cx = 0; cx < fKernelSize.fWidth; cx++) {
                    SkPMColor s = PixelFetcher::fetch(src, x + cx - fTarget.fX, y + cy - fTarget.fY);
                    SkScalar k = fKernel[cy * fKernelSize.fWidth + cx];
                    if (convolveAlpha) {
                        sumA += SkScalarMul(SkIntToScalar(SkGetPackedA32(s)), k);
                    }
                    sumR += SkScalarMul(SkIntToScalar(SkGetPackedR32(s)), k);
                    sumG += SkScalarMul(SkIntToScalar(SkGetPackedG32(s)), k);
                    sumB += SkScalarMul(SkIntToScalar(SkGetPackedB32(s)), k);
                }
            }
            int a = convolveAlpha
                    ? SkClampMax(SkScalarFloorToInt(SkScalarMul(sumA, fGain) + fBias), 255)
                    : 255;
            int r = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumR, fGain) + fBias), a);
            int g = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumG, fGain) + fBias), a);
            int b = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumB, fGain) + fBias), a);
            if (!convolveAlpha) {
                a = SkGetPackedA32(PixelFetcher::fetch(src, x, y));
                *dptr++ = SkPreMultiplyARGB(a, r, g, b);
            } else {
                *dptr++ = SkPackARGB32(a, r, g, b);
            }
        }
    }
}

bool TiledPictureRenderer::render(const SkString* path, SkBitmap** out) {
    SkASSERT(fPicture != NULL);
    if (NULL == fPicture) {
        return false;
    }

    SkBitmap bitmap;
    if (out){
        *out = SkNEW(SkBitmap);
        setup_bitmap(*out, fPicture->width(), fPicture->height());
        setup_bitmap(&bitmap, fTileWidth, fTileHeight);
    }
    bool success = true;
    for (int i = 0; i < fTileRects.count(); ++i) {
        draw_tile_to_canvas(fCanvas, fTileRects[i], fPicture);
        if (NULL != path) {
            success &= writeAppendNumber(fCanvas, path, i, fJsonSummaryPtr);
        }
        if (NULL != out) {
            if (fCanvas->readPixels(&bitmap, 0, 0)) {
                // Add this tile to the entire bitmap.
                bitmapCopyAtOffset(bitmap, *out, SkScalarFloorToInt(fTileRects[i].left()),
                                   SkScalarFloorToInt(fTileRects[i].top()));
            } else {
                success = false;
            }
        }
    }
    return success;
}

bool SkHitTestPath(const SkPath& path, SkRect& target, bool hires) {
    if (target.isEmpty()) {
        return false;
    }

    bool isInverse = path.isInverseFillType();
    if (path.isEmpty()) {
        return isInverse;
    }

    SkRect bounds = path.getBounds();

    bool sects = SkRect::Intersects(target, bounds);
    if (isInverse) {
        if (!sects) {
            return true;
        }
    } else {
        if (!sects) {
            return false;
        }
        if (target.contains(bounds)) {
            return true;
        }
    }

    SkPath devPath;
    const SkPath* pathPtr;
    SkRect        devTarget;

    if (hires) {
        const SkScalar coordLimit = SkIntToScalar(16384);
        const SkRect limit = { 0, 0, coordLimit, coordLimit };
        
        SkMatrix matrix;
        matrix.setRectToRect(bounds, limit, SkMatrix::kFill_ScaleToFit);

        path.transform(matrix, &devPath);
        matrix.mapRect(&devTarget, target);

        pathPtr = &devPath;
    } else {
        devTarget = target;
        pathPtr = &path;
    }

    SkIRect iTarget;
    devTarget.round(&iTarget);
    if (iTarget.isEmpty()) {
        iTarget.fLeft = SkScalarFloorToInt(devTarget.fLeft);
        iTarget.fTop = SkScalarFloorToInt(devTarget.fTop);
        iTarget.fRight = iTarget.fLeft + 1;
        iTarget.fBottom = iTarget.fTop + 1;
    }

    SkRegion clip(iTarget);
    SkRegion rgn;
    return rgn.setPath(*pathPtr, clip) ^ isInverse;
}

// Applies the 1D half kernel vertically at points along the x axis to a circle centered at the
// origin with radius circleR.
void apply_kernel_in_y(float* results, int numSteps, float firstX, float circleR,
                       int halfKernelSize, const float* summedHalfKernelTable) {
    float x = firstX;
    for (int i = 0; i < numSteps; ++i, x += 1.f) {
        if (x < -circleR || x > circleR) {
            results[i] = 0;
            continue;
        }
        float y = sqrtf(circleR * circleR - x * x);
        // In the column at x we exit the circle at +y and -y
        // The summed table entry j is actually reflects an offset of j + 0.5.
        y -= 0.5f;
        int yInt = SkScalarFloorToInt(y);
        SkASSERT(yInt >= -1);
        if (y < 0) {
            results[i] = (y + 0.5f) * summedHalfKernelTable[0];
        } else if (yInt >= halfKernelSize - 1) {
            results[i] = 0.5f;
        } else {
            float yFrac = y - yInt;
            results[i] = (1.f - yFrac) * summedHalfKernelTable[yInt] +
                         yFrac * summedHalfKernelTable[yInt + 1];
        }
    }
}

static SkColor HSV_to_RGB(SkColor color, HSV_Choice choice, SkScalar hsv) {
    SkScalar hue = choice == kGetHue ? hsv : RGB_to_HSV(color, kGetHue);
    SkScalar saturation = choice == kGetSaturation ? hsv : RGB_to_HSV(color, kGetSaturation);
    SkScalar value = choice == kGetValue ? hsv : RGB_to_HSV(color, kGetValue);
    value *= 255;
    SkScalar red SK_INIT_TO_AVOID_WARNING;
    SkScalar green SK_INIT_TO_AVOID_WARNING;
    SkScalar blue SK_INIT_TO_AVOID_WARNING;
    if (saturation == 0)    // color is on black-and-white center line
        red = green = blue = value;
    else {
        //SkScalar fraction = SkScalarMod(hue, 60 * SK_Scalar1);
        int sextant = SkScalarFloorToInt(hue / 60);
        SkScalar fraction = hue / 60 - SkIntToScalar(sextant);
        SkScalar p = SkScalarMul(value , SK_Scalar1 - saturation);
        SkScalar q = SkScalarMul(value, SK_Scalar1 - SkScalarMul(saturation, fraction));
        SkScalar t = SkScalarMul(value, SK_Scalar1 -
            SkScalarMul(saturation, SK_Scalar1 - fraction));
        switch (sextant % 6) {
            case 0: red = value; green = t; blue = p; break;
            case 1: red = q; green = value; blue = p; break;
            case 2: red = p; green = value; blue = t; break;
            case 3: red = p; green = q; blue = value; break;
            case 4: red = t;  green = p; blue = value; break;
            case 5: red = value; green = p; blue = q; break;
        }
    }
    //used to say SkToU8((U8CPU) red) etc
    return SkColorSetARGB(SkColorGetA(color), SkScalarRoundToInt(red),
                          SkScalarRoundToInt(green), SkScalarRoundToInt(blue));
}

 Noise(SkScalar component)
 {
     SkScalar position = component + kPerlinNoise;
     noisePositionIntegerValue = SkScalarFloorToInt(position);
     noisePositionFractionValue = position - SkIntToScalar(noisePositionIntegerValue);
     nextNoisePositionIntegerValue = noisePositionIntegerValue + 1;
 }

void SkColorCubeFilter::ColorCubeProcesingCache::initProcessingLuts(
    SkColorCubeFilter::ColorCubeProcesingCache* cache) {
    static const SkScalar inv8bit = SkScalarInvert(SkIntToScalar(255));

    // We need 256 int * 2 for fColorToIndex, so a total of 512 int.
    // We need 256 SkScalar * 2 for fColorToFactors and 256 SkScalar
    // for fColorToScalar, so a total of 768 SkScalar.
    cache->fLutStorage.reset(512 * sizeof(int) + 768 * sizeof(SkScalar));
    uint8_t* storage = (uint8_t*)cache->fLutStorage.get();
    cache->fColorToIndex[0] = (int*)storage;
    cache->fColorToIndex[1] = cache->fColorToIndex[0] + 256;
    cache->fColorToFactors[0] = (SkScalar*)(storage + (512 * sizeof(int)));
    cache->fColorToFactors[1] = cache->fColorToFactors[0] + 256;
    cache->fColorToScalar = cache->fColorToFactors[1] + 256;

    SkScalar size = SkIntToScalar(cache->fCubeDimension);
    SkScalar scale = (size - SK_Scalar1) * inv8bit;

    for (int i = 0; i < 256; ++i) {
        SkScalar index = scale * i;
        cache->fColorToIndex[0][i] = SkScalarFloorToInt(index);
        cache->fColorToIndex[1][i] = cache->fColorToIndex[0][i] + 1;
        cache->fColorToScalar[i] = inv8bit * i;
        if (cache->fColorToIndex[1][i] < cache->fCubeDimension) {
            cache->fColorToFactors[1][i] = index - SkIntToScalar(cache->fColorToIndex[0][i]);
            cache->fColorToFactors[0][i] = SK_Scalar1 - cache->fColorToFactors[1][i];
        } else {
            cache->fColorToIndex[1][i] = cache->fColorToIndex[0][i];
            cache->fColorToFactors[0][i] = SK_Scalar1;
            cache->fColorToFactors[1][i] = 0;
        }
    }
}

    bool onClick(const SkPoint& clickPos) override {
        SkASSERT(fParent);
        SkScalar x = SkScalarPin(clickPos.fX, 0.0f, fSliderRange);
        int numChoices = fMax - fMin + 1;
        *fOutput = SkTMin(SkScalarFloorToInt(numChoices * x / fSliderRange) + fMin, fMax);

        return true;
    }

bool SkMorphologyImageFilter::filterImageGPUGeneric(bool dilate,
                                                    Proxy* proxy,
                                                    const SkBitmap& src,
                                                    const Context& ctx,
                                                    SkBitmap* result,
                                                    SkIPoint* offset) const {
    SkBitmap input = src;
    SkIPoint srcOffset = SkIPoint::Make(0, 0);
    if (this->getInput(0) &&
        !this->getInput(0)->getInputResultGPU(proxy, src, ctx, &input, &srcOffset)) {
        return false;
    }
    SkIRect bounds;
    if (!this->applyCropRect(ctx, proxy, input, &srcOffset, &bounds, &input)) {
        return false;
    }
    SkVector radius = SkVector::Make(SkIntToScalar(this->radius().width()),
                                     SkIntToScalar(this->radius().height()));
    ctx.ctm().mapVectors(&radius, 1);
    int width = SkScalarFloorToInt(radius.fX);
    int height = SkScalarFloorToInt(radius.fY);

    if (width < 0 || height < 0) {
        return false;
    }

    SkIRect srcBounds = bounds;
    srcBounds.offset(-srcOffset);
    if (width == 0 && height == 0) {
        input.extractSubset(result, srcBounds);
        offset->fX = bounds.left();
        offset->fY = bounds.top();
        return true;
    }

    GrMorphologyEffect::MorphologyType type = dilate ? GrMorphologyEffect::kDilate_MorphologyType
                                                     : GrMorphologyEffect::kErode_MorphologyType;
    if (!apply_morphology(input, srcBounds, type, SkISize::Make(width, height), result)) {
        return false;
    }
    offset->fX = bounds.left();
    offset->fY = bounds.top();
    return true;
}

void GrTextUtils::DrawBmpPosText(GrAtlasTextBlob* blob, int runIndex,
                                 GrBatchFontCache* fontCache,
                                 const SkSurfaceProps& props, const SkPaint& skPaint,
                                 GrColor color,
                                 const SkMatrix& viewMatrix,
                                 const char text[], size_t byteLength,
                                 const SkScalar pos[], int scalarsPerPosition,
                                 const SkPoint& offset) {
    SkASSERT(byteLength == 0 || text != nullptr);
    SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);

    // nothing to draw
    if (text == nullptr || byteLength == 0) {
        return;
    }

    // Ensure the blob is set for bitmaptext
    blob->setHasBitmap();

    GrBatchTextStrike* currStrike = nullptr;

    // Get GrFontScaler from cache
    SkGlyphCache* cache = blob->setupCache(runIndex, props, SkPaint::FakeGamma::On,
                                           skPaint, &viewMatrix);
    GrFontScaler* fontScaler = GrTextUtils::GetGrFontScaler(cache);

    SkFindAndPlaceGlyph::ProcessPosText(
        skPaint.getTextEncoding(), text, byteLength,
        offset, viewMatrix, pos, scalarsPerPosition,
        skPaint.getTextAlign(), cache,
        [&](const SkGlyph& glyph, SkPoint position, SkPoint rounding) {
            position += rounding;
            BmpAppendGlyph(
                blob, runIndex, fontCache, &currStrike, glyph,
                SkScalarFloorToInt(position.fX), SkScalarFloorToInt(position.fY),
                color, fontScaler);
        }
    );

    SkGlyphCache::AttachCache(cache);
}

    virtual bool onClick(SkView::Click* click) {
        SkPoint prev = click->fPrev;
        SkPoint curr = click->fCurr;
        bool handled = true;
        switch (click->fState) {
            case SkView::Click::kDown_State:
                if (SkScalarAbs(curr.fX - fCommands->width()) <= SKDEBUGGER_RESIZEBARSIZE) {
                    fCommandsResizing = true;
                }
                else if (SkScalarAbs(curr.fY - (this->height() - fState->height())) <= SKDEBUGGER_RESIZEBARSIZE &&
                         curr.fX > fCommands->width()) {
                    fStateResizing = true;
                }
                else if (curr.fX < fCommands->width()) {
                    fAtomsToRead = fCommands->selectHighlight(
                                                  SkScalarFloorToInt(curr.fY));
                }
                else
                    handled = false;
                break;
            case SkView::Click::kMoved_State:
                if (fCommandsResizing)
                    fCommands->setSize(curr.fX, this->height());
                else if (fStateResizing)
                    fState->setSize(this->width(), this->height() - curr.fY);
                else if (curr.fX < fCommands->width()) {
                    if (curr.fY - prev.fY < 0) {
                        fCommands->scrollDown();
                    }
                    if (curr.fY - prev.fY > 0) {
                        fCommands->scrollUp();
                    }
                }
                else
                    handled = false;
                break;
            case SkView::Click::kUp_State:
                fStateResizing = fCommandsResizing = false;
                break;
            default:
                break;
        }

        fStateOffset = fCommands->width();
        fState->setSize(this->width() - fStateOffset, fState->height());
        fState->setLoc(fStateOffset, this->height() - fState->height());
        if (handled)
            this->inval(NULL);
        return handled;
    }

SkPMColor SkPerlinNoiseShader::PerlinNoiseShaderContext::shade(
        const SkPoint& point, StitchData& stitchData) const {
    SkPoint newPoint;
    fMatrix.mapPoints(&newPoint, &point, 1);
    newPoint.fX = SkScalarRoundToScalar(newPoint.fX);
    newPoint.fY = SkScalarRoundToScalar(newPoint.fY);

    U8CPU rgba[4];
    for (int channel = 3; channel >= 0; --channel) {
        rgba[channel] = SkScalarFloorToInt(255 *
            calculateTurbulenceValueForPoint(channel, stitchData, newPoint));
    }
    return SkPreMultiplyARGB(rgba[3], rgba[0], rgba[1], rgba[2]);
}