C++ SkIPoint类代码示例

static void convolve_gaussian_2d(GrDrawContext* drawContext,
                                 const GrClip& clip,
                                 const SkIRect& dstRect,
                                 const SkIPoint& srcOffset,
                                 GrTexture* texture,
                                 int radiusX,
                                 int radiusY,
                                 SkScalar sigmaX,
                                 SkScalar sigmaY,
                                 const SkIRect* srcBounds) {
    SkMatrix localMatrix = SkMatrix::MakeTrans(-SkIntToScalar(srcOffset.x()),
                                               -SkIntToScalar(srcOffset.y()));
    SkISize size = SkISize::Make(2 * radiusX + 1,  2 * radiusY + 1);
    SkIPoint kernelOffset = SkIPoint::Make(radiusX, radiusY);
    GrPaint paint;
    paint.setGammaCorrect(drawContext->isGammaCorrect());
    SkIRect bounds = srcBounds ? *srcBounds : SkIRect::EmptyIRect();

    sk_sp<GrFragmentProcessor> conv(GrMatrixConvolutionEffect::MakeGaussian(
            texture, bounds, size, 1.0, 0.0, kernelOffset,
            srcBounds ? GrTextureDomain::kDecal_Mode : GrTextureDomain::kIgnore_Mode,
            true, sigmaX, sigmaY));
    paint.addColorFragmentProcessor(std::move(conv));
    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
    drawContext->fillRectWithLocalMatrix(clip, paint, SkMatrix::I(), 
                                         SkRect::Make(dstRect), localMatrix);
}

bool SkCullPoints::sect_test(int x0, int y0, int x1, int y1) const
{
    const SkIRect& r = fR;

    if (x0 < r.fLeft    && x1 < r.fLeft ||
        x0 > r.fRight   && x1 > r.fRight ||
        y0 < r.fTop     && y1 < r.fTop ||
        y0 > r.fBottom  && y1 > r.fBottom)
        return false;

    // since the crossprod test is a little expensive, check for easy-in cases first    
    if (r.contains(x0, y0) || r.contains(x1, y1))
        return true;

    // At this point we're not sure, so we do a crossprod test
    SkIPoint           vec;
    const SkIPoint*    rAsQuad = fAsQuad;
    
    vec.set(x1 - x0, y1 - y0);
    bool isNeg = cross_product_is_neg(vec, x0 - rAsQuad[0].fX, y0 - rAsQuad[0].fY);
    for (int i = 1; i < 4; i++) {
        if (cross_product_is_neg(vec, x0 - rAsQuad[i].fX, y0 - rAsQuad[i].fY) != isNeg)
        {
            return true;
        }
    }
    return false;   // we didn't intersect
}

void SkBitmapDevice::drawSpecial(const SkDraw& draw, SkSpecialImage* srcImg, int x, int y,
                                 const SkPaint& paint) {
    SkASSERT(!srcImg->isTextureBacked());

    SkBitmap resultBM;

    SkImageFilter* filter = paint.getImageFilter();
    if (filter) {
        SkIPoint offset = SkIPoint::Make(0, 0);
        SkMatrix matrix = *draw.fMatrix;
        matrix.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y));
        const SkIRect clipBounds = draw.fRC->getBounds().makeOffset(-x, -y);
        SkAutoTUnref<SkImageFilterCache> cache(this->getImageFilterCache());
        SkImageFilter::OutputProperties outputProperties(fBitmap.colorSpace());
        SkImageFilter::Context ctx(matrix, clipBounds, cache.get(), outputProperties);
        
        sk_sp<SkSpecialImage> resultImg(filter->filterImage(srcImg, ctx, &offset));
        if (resultImg) {
            SkPaint tmpUnfiltered(paint);
            tmpUnfiltered.setImageFilter(nullptr);
            if (resultImg->getROPixels(&resultBM)) {
                this->drawSprite(draw, resultBM, x + offset.x(), y + offset.y(), tmpUnfiltered);
            }
        }
    } else {
        if (srcImg->getROPixels(&resultBM)) {
            this->drawSprite(draw, resultBM, x, y, paint);
        }
    }
}

GrMatrixConvolutionEffect::GrMatrixConvolutionEffect(sk_sp<GrTextureProxy> proxy,
                                                     const SkIRect& bounds,
                                                     const SkISize& kernelSize,
                                                     const SkScalar* kernel,
                                                     SkScalar gain,
                                                     SkScalar bias,
                                                     const SkIPoint& kernelOffset,
                                                     GrTextureDomain::Mode tileMode,
                                                     bool convolveAlpha)
        // To advertise either the modulation or opaqueness optimizations we'd have to examine the
        // parameters.
        : INHERITED(kGrMatrixConvolutionEffect_ClassID, kNone_OptimizationFlags)
        , fCoordTransform(proxy.get())
        , fDomain(proxy.get(), GrTextureDomain::MakeTexelDomainForMode(bounds, tileMode), tileMode)
        , fTextureSampler(std::move(proxy))
        , fKernelSize(kernelSize)
        , fGain(SkScalarToFloat(gain))
        , fBias(SkScalarToFloat(bias) / 255.0f)
        , fConvolveAlpha(convolveAlpha) {
    this->addCoordTransform(&fCoordTransform);
    this->addTextureSampler(&fTextureSampler);
    for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) {
        fKernel[i] = SkScalarToFloat(kernel[i]);
    }
    fKernelOffset[0] = static_cast<float>(kernelOffset.x());
    fKernelOffset[1] = static_cast<float>(kernelOffset.y());
}

sk_sp<SkSpecialImage> SkComposeImageFilter::onFilterImage(SkSpecialImage* source,
                                                          const Context& ctx,
                                                          SkIPoint* offset) const {
    // The bounds passed to the inner filter must be filtered by the outer
    // filter, so that the inner filter produces the pixels that the outer
    // filter requires as input. This matters if the outer filter moves pixels.
    SkIRect innerClipBounds;
    innerClipBounds = this->getInput(0)->filterBounds(ctx.clipBounds(), ctx.ctm());
    Context innerContext(ctx.ctm(), innerClipBounds, ctx.cache());
    SkIPoint innerOffset = SkIPoint::Make(0, 0);
    sk_sp<SkSpecialImage> inner(this->filterInput(1, source, innerContext, &innerOffset));
    if (!inner) {
        return nullptr;
    }

    SkMatrix outerMatrix(ctx.ctm());
    outerMatrix.postTranslate(SkIntToScalar(-innerOffset.x()), SkIntToScalar(-innerOffset.y()));
    SkIRect clipBounds = ctx.clipBounds();
    clipBounds.offset(-innerOffset.x(), -innerOffset.y());
    Context outerContext(outerMatrix, clipBounds, ctx.cache());

    SkIPoint outerOffset = SkIPoint::Make(0, 0);
    sk_sp<SkSpecialImage> outer(this->filterInput(0, inner.get(), outerContext, &outerOffset));
    if (!outer) {
        return nullptr;
    }

    *offset = innerOffset + outerOffset;
    return outer;
}

void SkBaseDevice::drawSpriteWithFilter(const SkDraw& draw, const SkBitmap& bitmap,
                                        int x, int y,
                                        const SkPaint& paint) {
    SkImageFilter* filter = paint.getImageFilter();
    SkASSERT(filter);

    SkIPoint offset = SkIPoint::Make(0, 0);
    SkMatrix matrix = *draw.fMatrix;
    matrix.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y));
    const SkIRect clipBounds = draw.fRC->getBounds().makeOffset(-x, -y);
    SkAutoTUnref<SkImageFilterCache> cache(this->getImageFilterCache());
    SkImageFilter::Context ctx(matrix, clipBounds, cache.get());

    sk_sp<SkSpecialImage> srcImg(SkSpecialImage::internal_fromBM(bitmap, &this->surfaceProps()));
    if (!srcImg) {
        return; // something disastrous happened
    }

    sk_sp<SkSpecialImage> resultImg(filter->filterImage(srcImg.get(), ctx, &offset));
    if (resultImg) {
        SkPaint tmpUnfiltered(paint);
        tmpUnfiltered.setImageFilter(nullptr);
        SkBitmap resultBM;
        if (resultImg->internal_getBM(&resultBM)) {
            // TODO: add drawSprite(SkSpecialImage) to SkDevice? (see skbug.com/5073)
            this->drawSprite(draw, resultBM, x + offset.x(), y + offset.y(), tmpUnfiltered);
        }
    }
}

sk_sp<GrTextureProxy> SkImageGenerator::generateTexture(GrContext* ctx, const SkImageInfo& info,
                                                        const SkIPoint& origin) {
    SkIRect srcRect = SkIRect::MakeXYWH(origin.x(), origin.y(), info.width(), info.height());
    if (!SkIRect::MakeWH(fInfo.width(), fInfo.height()).contains(srcRect)) {
        return nullptr;
    }
    return this->onGenerateTexture(ctx, info, origin);
}

const SkGlyph& SkGlyphCache::getGlyphMetrics(SkGlyphID glyphID, SkPoint position) {
    if (!fIsSubpixel) {
        return this->getGlyphIDMetrics(glyphID);
    } else {
        SkIPoint lookupPosition = SkGlyphCacheCommon::SubpixelLookup(fAxisAlignment, position);

        return this->getGlyphIDMetrics(glyphID, lookupPosition.x(), lookupPosition.y());
    }
}

static SkGrPixelRef* copyToTexturePixelRef(GrTexture* texture, const SkIRect* subset) {
    if (NULL == texture) {
        return NULL;
    }
    GrContext* context = texture->getContext();
    if (NULL == context) {
        return NULL;
    }
    GrTextureDesc desc;

    SkIPoint pointStorage;
    SkIPoint* topLeft;
    if (subset != NULL) {
        SkASSERT(SkIRect::MakeWH(texture->width(), texture->height()).contains(*subset));
        // Create a new texture that is the size of subset.
        desc.fWidth = subset->width();
        desc.fHeight = subset->height();
        pointStorage.set(subset->x(), subset->y());
        topLeft = &pointStorage;
    } else {
        desc.fWidth  = texture->width();
        desc.fHeight = texture->height();
        topLeft = NULL;
    }
    desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
    desc.fConfig = texture->config();

    SkImageInfo info;
    if (!GrPixelConfig2ColorType(desc.fConfig, &info.fColorType)) {
        return NULL;
    }
    info.fWidth = desc.fWidth;
    info.fHeight = desc.fHeight;
    info.fAlphaType = kPremul_SkAlphaType;

    GrTexture* dst = context->createUncachedTexture(desc, NULL, 0);
    if (NULL == dst) {
        return NULL;
    }

    context->copyTexture(texture, dst->asRenderTarget(), topLeft);

    // TODO: figure out if this is responsible for Chrome canvas errors
#if 0
    // The render texture we have created (to perform the copy) isn't fully
    // functional (since it doesn't have a stencil buffer). Release it here
    // so the caller doesn't try to render to it.
    // TODO: we can undo this release when dynamic stencil buffer attach/
    // detach has been implemented
    dst->releaseRenderTarget();
#endif

    SkGrPixelRef* pixelRef = SkNEW_ARGS(SkGrPixelRef, (info, dst));
    SkSafeUnref(dst);
    return pixelRef;
}

bool SkMergeImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src,
                                       const Context& ctx,
                                       SkBitmap* result, SkIPoint* offset) const {
    if (countInputs() < 1) {
        return false;
    }

    SkIRect bounds;
    if (!this->applyCropRect(ctx, src, SkIPoint::Make(0, 0), &bounds)) {
        return false;
    }

    const int x0 = bounds.left();
    const int y0 = bounds.top();

    SkAutoTUnref<SkBaseDevice> dst(proxy->createDevice(bounds.width(), bounds.height()));
    if (nullptr == dst) {
        return false;
    }
    SkCanvas canvas(dst);
    SkPaint paint;

    bool didProduceResult = false;
    int inputCount = countInputs();
    for (int i = 0; i < inputCount; ++i) {
        SkBitmap tmp;
        const SkBitmap* srcPtr;
        SkIPoint pos = SkIPoint::Make(0, 0);
        SkImageFilter* filter = getInput(i);
        if (filter) {
            if (!filter->filterImage(proxy, src, ctx, &tmp, &pos)) {
                continue;
            }
            srcPtr = &tmp;
        } else {
            srcPtr = &src;
        }

        if (fModes) {
            paint.setXfermodeMode((SkXfermode::Mode)fModes[i]);
        } else {
            paint.setXfermode(nullptr);
        }
        canvas.drawSprite(*srcPtr, pos.x() - x0, pos.y() - y0, &paint);
        didProduceResult = true;
    }

    if (!didProduceResult)
        return false;

    offset->fX = bounds.left();
    offset->fY = bounds.top();
    *result = dst->accessBitmap(false);
    return true;
}

bool SkBlurMask::BoxBlur(SkMask* dst, const SkMask& src, SkScalar sigma, SkBlurStyle style,
                         SkIPoint* margin) {
    if (src.fFormat != SkMask::kA8_Format && src.fFormat != SkMask::kARGB32_Format) {
        return false;
    }

    SkIPoint border;

    SkMaskBlurFilter blurFilter{sigma, sigma};
    if (blurFilter.hasNoBlur()) {
        return false;
    }
    border = blurFilter.blur(src, dst);
    // If src.fImage is null, then this call is only to calculate the border.
    if (src.fImage != nullptr && dst->fImage == nullptr) {
        return false;
    }

    if (src.fImage != nullptr) {
        // if need be, alloc the "real" dst (same size as src) and copy/merge
        // the blur into it (applying the src)
        if (style == kInner_SkBlurStyle) {
            // now we allocate the "real" dst, mirror the size of src
            size_t srcSize = src.computeImageSize();
            if (0 == srcSize) {
                return false;   // too big to allocate, abort
            }
            auto blur = dst->fImage;
            dst->fImage = SkMask::AllocImage(srcSize);
            auto blurStart = &blur[border.x() + border.y() * dst->fRowBytes];
            merge_src_with_blur(dst->fImage, src.fRowBytes,
                                src.fImage, src.fRowBytes,
                                blurStart,
                                dst->fRowBytes,
                                src.fBounds.width(), src.fBounds.height());
            SkMask::FreeImage(blur);
        } else if (style != kNormal_SkBlurStyle) {
            auto dstStart = &dst->fImage[border.x() + border.y() * dst->fRowBytes];
            clamp_with_orig(dstStart,
                            dst->fRowBytes, src.fImage, src.fRowBytes,
                            src.fBounds.width(), src.fBounds.height(), style);
        }
    }

    if (style == kInner_SkBlurStyle) {
        dst->fBounds = src.fBounds; // restore trimmed bounds
        dst->fRowBytes = src.fRowBytes;
    }

    if (margin != nullptr) {
        *margin = border;
    }

    return true;
}

sk_sp<SkSpecialImage> SkDropShadowImageFilter::onFilterImage(SkSpecialImage* source,
                                                             const Context& ctx,
                                                             SkIPoint* offset) const {
    SkIPoint inputOffset = SkIPoint::Make(0, 0);
    sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
    if (!input) {
        return nullptr;
    }

    const SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(),
                                                  input->width(), input->height());
    SkIRect bounds;
    if (!this->applyCropRect(ctx, inputBounds, &bounds)) {
        return nullptr;
    }

    const SkImageInfo info = SkImageInfo::MakeN32(bounds.width(), bounds.height(),
                                                  kPremul_SkAlphaType);
    sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
    if (!surf) {
        return nullptr;
    }

    SkCanvas* canvas = surf->getCanvas();
    SkASSERT(canvas);

    canvas->clear(0x0);

    SkVector sigma = SkVector::Make(fSigmaX, fSigmaY);
    ctx.ctm().mapVectors(&sigma, 1);
    sigma.fX = SkMaxScalar(0, sigma.fX);
    sigma.fY = SkMaxScalar(0, sigma.fY);

    SkAutoTUnref<SkImageFilter> blurFilter(SkBlurImageFilter::Create(sigma.fX, sigma.fY));
    SkPaint paint;
    paint.setImageFilter(blurFilter.get());
    paint.setColorFilter(SkColorFilter::MakeModeFilter(fColor, SkXfermode::kSrcIn_Mode));
    paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);

    SkVector offsetVec = SkVector::Make(fDx, fDy);
    ctx.ctm().mapVectors(&offsetVec, 1);

    canvas->translate(SkIntToScalar(inputOffset.fX - bounds.fLeft),
                      SkIntToScalar(inputOffset.fY - bounds.fTop));
    input->draw(canvas, offsetVec.fX, offsetVec.fY, &paint);

    if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
        input->draw(canvas, 0, 0, nullptr);
    }
    offset->fX = bounds.fLeft;
    offset->fY = bounds.fTop;
    return surf->makeImageSnapshot();
}

    void onDraw(SkCanvas* canvas) override {
        auto cf = SkColorFilter::MakeModeFilter(SK_ColorGREEN, SkXfermode::kSrc_Mode);
        sk_sp<SkImageFilter> filters[] = {
            SkColorFilterImageFilter::Make(std::move(cf), nullptr),
            SkBlurImageFilter::Make(2.0f, 2.0f, nullptr),
            SkDropShadowImageFilter::Make(
                10.0f, 5.0f, 3.0f, 3.0f, SK_ColorBLUE,
                SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
                nullptr),
        };

        SkIRect clipBounds[] {
            { -20, -20, 100, 100 },
            {   0,   0,  75,  75 },
            {  20,  20, 100, 100 },
            { -20, -20,  50,  50 },
            {  20,  20,  50,  50 },
        };

        SkImageInfo info = SkImageInfo::MakeN32(100, 100, kPremul_SkAlphaType);
        SkScalar MARGIN = SkIntToScalar(40);
        SkScalar DX = info.width() + MARGIN;
        SkScalar DY = info.height() + MARGIN;

        canvas->translate(MARGIN, MARGIN);

        sk_sp<SkSurface> surface = canvas->makeSurface(info);
        if (!surface) {
            surface = SkSurface::MakeRaster(info);
        }
        sk_tool_utils::draw_checkerboard(surface->getCanvas());
        sk_sp<SkImage> source = surface->makeImageSnapshot();

        for (auto clipBound : clipBounds) {
            canvas->save();
            for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
                SkIRect subset = SkIRect::MakeXYWH(25, 25, 50, 50);
                SkIRect outSubset;
                SkIPoint offset;
                sk_sp<SkImage> result = source->makeWithFilter(filters[i].get(), subset, clipBound,
                                                               &outSubset, &offset);
                SkASSERT(result);
                SkASSERT(source->isTextureBacked() == result->isTextureBacked());
                result = result->makeSubset(outSubset);
                canvas->drawImage(result.get(), SkIntToScalar(offset.fX), SkIntToScalar(offset.fY));
                show_bounds(canvas, SkIRect::MakeXYWH(offset.x(), offset.y(), outSubset.width(),
                                                      outSubset.height()), clipBound);
                canvas->translate(DX, 0);
            }
            canvas->restore();
            canvas->translate(0, DY);
        }
    }

bool SkMergeImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src,
                                       const SkMatrix& ctm,
                                       SkBitmap* result, SkIPoint* loc) {
    if (countInputs() < 1) {
        return false;
    }

    const SkIRect srcBounds = SkIRect::MakeXYWH(loc->x(), loc->y(),
                                                src.width(), src.height());
    SkIRect bounds;
    if (!this->filterBounds(srcBounds, ctm, &bounds)) {
        return false;
    }

    const int x0 = bounds.left();
    const int y0 = bounds.top();

    SkAutoTUnref<SkDevice> dst(proxy->createDevice(bounds.width(), bounds.height()));
    if (NULL == dst) {
        return false;
    }
    SkCanvas canvas(dst);
    SkPaint paint;

    int inputCount = countInputs();
    for (int i = 0; i < inputCount; ++i) {
        SkBitmap tmp;
        const SkBitmap* srcPtr;
        SkIPoint pos = *loc;
        SkImageFilter* filter = getInput(i);
        if (filter) {
            if (!filter->filterImage(proxy, src, ctm, &tmp, &pos)) {
                return false;
            }
            srcPtr = &tmp;
        } else {
            srcPtr = &src;
        }

        if (fModes) {
            paint.setXfermodeMode((SkXfermode::Mode)fModes[i]);
        } else {
            paint.setXfermode(NULL);
        }
        canvas.drawSprite(*srcPtr, pos.x() - x0, pos.y() - y0, &paint);
    }

    loc->set(bounds.left(), bounds.top());
    *result = dst->accessBitmap(false);
    return true;
}

void SkBaseDevice::drawBitmapAsSprite(const SkDraw& draw, const SkBitmap& bitmap, int x, int y,
                                      const SkPaint& paint) {
    SkImageFilter* filter = paint.getImageFilter();
    if (filter && !this->canHandleImageFilter(filter)) {
        SkImageFilter::DeviceProxy proxy(this);
        SkBitmap dst;
        SkIPoint offset = SkIPoint::Make(0, 0);
        SkMatrix matrix = *draw.fMatrix;
        matrix.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y));
        const SkIRect clipBounds = draw.fClip->getBounds().makeOffset(-x, -y);
        SkAutoTUnref<SkImageFilter::Cache> cache(this->getImageFilterCache());
        SkImageFilter::Context ctx(matrix, clipBounds, cache.get());
        if (filter->filterImageDeprecated(&proxy, bitmap, ctx, &dst, &offset)) {
            SkPaint tmpUnfiltered(paint);
            tmpUnfiltered.setImageFilter(nullptr);
            this->drawSprite(draw, dst, x + offset.x(), y + offset.y(), tmpUnfiltered);
        }
    } else {
        this->drawSprite(draw, bitmap, x, y, paint);
    }
}