C++ sk_bzero函数代码示例

bool GrSWMaskHelper::init(const GrIRect& pathDevBounds, const GrPoint* translate) {
    fMatrix = fContext->getMatrix();
    if (NULL != translate) {
        fMatrix.postTranslate(translate->fX, translate->fY);
    }

    fMatrix.postTranslate(-pathDevBounds.fLeft * SK_Scalar1,
                            -pathDevBounds.fTop * SK_Scalar1);
    GrIRect bounds = GrIRect::MakeWH(pathDevBounds.width(),
                                        pathDevBounds.height());

    fBM.setConfig(SkBitmap::kA8_Config, bounds.fRight, bounds.fBottom);
    if (!fBM.allocPixels()) {
        return false;
    }
    sk_bzero(fBM.getPixels(), fBM.getSafeSize());

    sk_bzero(&fDraw, sizeof(fDraw));
    fRasterClip.setRect(bounds);
    fDraw.fRC    = &fRasterClip;
    fDraw.fClip  = &fRasterClip.bwRgn();
    fDraw.fMatrix = &fMatrix;
    fDraw.fBitmap = &fBM;
    return true;
}

bool GrSWMaskHelper::init(const SkIRect& resultBounds,
                          const SkMatrix* matrix) {
    if (NULL != matrix) {
        fMatrix = *matrix;
    } else {
        fMatrix.setIdentity();
    }

    // Now translate so the bound's UL corner is at the origin
    fMatrix.postTranslate(-resultBounds.fLeft * SK_Scalar1,
                          -resultBounds.fTop * SK_Scalar1);
    SkIRect bounds = SkIRect::MakeWH(resultBounds.width(),
                                     resultBounds.height());

    if (!fBM.allocPixels(SkImageInfo::MakeA8(bounds.fRight, bounds.fBottom))) {
        return false;
    }
    sk_bzero(fBM.getPixels(), fBM.getSafeSize());

    sk_bzero(&fDraw, sizeof(fDraw));
    fRasterClip.setRect(bounds);
    fDraw.fRC    = &fRasterClip;
    fDraw.fClip  = &fRasterClip.bwRgn();
    fDraw.fMatrix = &fMatrix;
    fDraw.fBitmap = &fBM;
    return true;
}

 void init(int dirNo) {
     fResult.init(dirNo);
     fFoundCount = 0;
     fSmallestError = 0;
     sk_bzero(fFilesFound, sizeof(fFilesFound));
     sk_bzero(fDirsFound, sizeof(fDirsFound));
     sk_bzero(fError, sizeof(fError));
 }

 virtual void generateFontMetrics(SkPaint::FontMetrics* mx,
                                  SkPaint::FontMetrics* my) {
     if (mx) {
         sk_bzero(mx, sizeof(*mx));
     }
     if (my) {
         sk_bzero(my, sizeof(*my));
     }
 }

 void init(int dirNo, skiatest::Reporter* reporter) {
     fReporter = reporter;
     fResult.init(dirNo);
     fFoundCount = 0;
     TestState::fSmallCount = 0;
     fSmallestError = 0;
     sk_bzero(fFilesFound, sizeof(fFilesFound));
     sk_bzero(fDirsFound, sizeof(fDirsFound));
     sk_bzero(fError, sizeof(fError));
 }

SkTestFont::SkTestFont(const SkTestFontData& fontData)
    : INHERITED()
    , fCharCodes(fontData.fCharCodes)
    , fCharCodesCount(fontData.fCharCodes ? fontData.fCharCodesCount : 0)
    , fWidths(fontData.fWidths)
    , fMetrics(fontData.fMetrics)
    , fName(fontData.fName)
    , fPaths(nullptr)
{
    init(fontData.fPoints, fontData.fVerbs);
#ifdef SK_DEBUG
    sk_bzero(fDebugBits, sizeof(fDebugBits));
    sk_bzero(fDebugOverage, sizeof(fDebugOverage));
#endif
}

static void testLineIntersect(skiatest::Reporter* reporter, const SkDQuad& quad,
                              const SkDLine& line, const double x, const double y) {
    char pathStr[1024];
    sk_bzero(pathStr, sizeof(pathStr));
    char* str = pathStr;
    str += sprintf(str, "    path.moveTo(%1.9g, %1.9g);\n", quad[0].fX, quad[0].fY);
    str += sprintf(str, "    path.quadTo(%1.9g, %1.9g, %1.9g, %1.9g);\n", quad[1].fX,
                   quad[1].fY, quad[2].fX, quad[2].fY);
    str += sprintf(str, "    path.moveTo(%1.9g, %1.9g);\n", line[0].fX, line[0].fY);
    str += sprintf(str, "    path.lineTo(%1.9g, %1.9g);\n", line[1].fX, line[1].fY);

    SkIntersections intersections;
    bool flipped = false;
    int result = doIntersect(intersections, quad, line, flipped);
    bool found = false;
    for (int index = 0; index < result; ++index) {
        double quadT = intersections[0][index];
        SkDPoint quadXY = quad.ptAtT(quadT);
        double lineT = intersections[1][index];
        SkDPoint lineXY = line.ptAtT(lineT);
        if (quadXY.approximatelyEqual(lineXY)) {
            found = true;
        }
    }
    REPORTER_ASSERT(reporter, found);
}

sk_sp<GrTextBlob> GrTextBlob::Make(int glyphCount, int runCount) {
    // We allocate size for the GrTextBlob itself, plus size for the vertices array,
    // and size for the glyphIds array.
    size_t verticesCount = glyphCount * kVerticesPerGlyph * kMaxVASize;

    size_t   blob = 0;
    size_t vertex = sk_align<alignof(char)>           (blob + sizeof(GrTextBlob) * 1);
    size_t glyphs = sk_align<alignof(GrGlyph*)>       (vertex + sizeof(char) * verticesCount);
    size_t   runs = sk_align<alignof(GrTextBlob::Run)>(glyphs + sizeof(GrGlyph*) * glyphCount);
    size_t   size =                                   (runs + sizeof(GrTextBlob::Run) * runCount);

    void* allocation = ::operator new (size);

    if (CACHE_SANITY_CHECK) {
        sk_bzero(allocation, size);
    }

    sk_sp<GrTextBlob> cacheBlob(new (allocation) GrTextBlob);
    cacheBlob->fSize = size;

    // setup offsets for vertices / glyphs
    cacheBlob->fVertices = SkTAddOffset<char>(cacheBlob.get(), vertex);
    cacheBlob->fGlyphs = SkTAddOffset<GrGlyph*>(cacheBlob.get(), glyphs);
    cacheBlob->fRuns = SkTAddOffset<GrTextBlob::Run>(cacheBlob.get(), runs);

    // Initialize runs
    for (int i = 0; i < runCount; i++) {
        new (&cacheBlob->fRuns[i]) GrTextBlob::Run;
    }
    cacheBlob->fRunCount = runCount;
    return cacheBlob;
}

void SkTypefacePlayback::setCount(int count) {
    this->reset(nullptr);

    fCount = count;
    fArray = new SkRefCnt* [count];
    sk_bzero(fArray, count * sizeof(SkRefCnt*));
}

/*
 * Return a valid set of output dimensions for this decoder, given an input scale
 */
SkISize SkJpegCodec::onGetScaledDimensions(float desiredScale) const {
    // libjpeg supports scaling by 1/1, 1/2, 1/4, and 1/8, so we will support these as well
    long scale;
    if (desiredScale > 0.75f) {
        scale = 1;
    } else if (desiredScale > 0.375f) {
        scale = 2;
    } else if (desiredScale > 0.1875f) {
        scale = 4;
    } else {
        scale = 8;
    }

    // Set up a fake decompress struct in order to use libjpeg to calculate output dimensions
    jpeg_decompress_struct dinfo;
    sk_bzero(&dinfo, sizeof(dinfo));
    dinfo.image_width = this->getInfo().width();
    dinfo.image_height = this->getInfo().height();
    dinfo.global_state = DSTATE_READY;
    dinfo.num_components = 0;
    dinfo.scale_num = 1;
    dinfo.scale_denom = scale;
    jpeg_calc_output_dimensions(&dinfo);

    // Return the calculated output dimensions for the given scale
    return SkISize::Make(dinfo.output_width, dinfo.output_height);
}

static void test_font(skiatest::Reporter* reporter) {
    uint32_t flags = 0;
    SkAutoTUnref<SkFont> font(SkFont::Create(nullptr, 24, SkFont::kA8_MaskType, flags));

    REPORTER_ASSERT(reporter, font->getTypeface());
    REPORTER_ASSERT(reporter, 24 == font->getSize());
    REPORTER_ASSERT(reporter, 1 == font->getScaleX());
    REPORTER_ASSERT(reporter, 0 == font->getSkewX());
    REPORTER_ASSERT(reporter, SkFont::kA8_MaskType == font->getMaskType());

    uint16_t glyphs[5];
    sk_bzero(glyphs, sizeof(glyphs));

    int count = font->textToGlyphs("Hello", 5, kUTF8_SkTextEncoding, glyphs, SK_ARRAY_COUNT(glyphs));

    REPORTER_ASSERT(reporter, 5 == count);
    for (int i = 0; i < count; ++i) {
        REPORTER_ASSERT(reporter, 0 != glyphs[i]);
    }
    REPORTER_ASSERT(reporter, glyphs[0] != glyphs[1]); // 'h' != 'e'
    REPORTER_ASSERT(reporter, glyphs[2] == glyphs[3]); // 'l' == 'l'

    SkAutoTUnref<SkFont> newFont(font->cloneWithSize(36));
    REPORTER_ASSERT(reporter, newFont.get());
    REPORTER_ASSERT(reporter, font->getTypeface() == newFont->getTypeface());
    REPORTER_ASSERT(reporter, 36 == newFont->getSize());   // double check we haven't changed
    REPORTER_ASSERT(reporter, 24 == font->getSize());   // double check we haven't changed

    SkPaint paint;
    paint.setTextSize(18);
    font.reset(SkFont::Testing_CreateFromPaint(paint));
    REPORTER_ASSERT(reporter, font.get());
    REPORTER_ASSERT(reporter, font->getSize() == paint.getTextSize());
    REPORTER_ASSERT(reporter, SkFont::kBW_MaskType == font->getMaskType());
}

static void testSimplifyQuadralateralsMain(PathOpsThreadState* data)
{
    SkASSERT(data);
    PathOpsThreadState& state = *data;
    char pathStr[1024];
    sk_bzero(pathStr, sizeof(pathStr));
    int ax = state.fA & 0x03;
    int ay = state.fA >> 2;
    int bx = state.fB & 0x03;
    int by = state.fB >> 2;
    int cx = state.fC & 0x03;
    int cy = state.fC >> 2;
    int dx = state.fD & 0x03;
    int dy = state.fD >> 2;
    for (int e = 0 ; e < 16; ++e) {
        int ex = e & 0x03;
        int ey = e >> 2;
        for (int f = e ; f < 16; ++f) {
            int fx = f & 0x03;
            int fy = f >> 2;
            for (int g = f ; g < 16; ++g) {
                int gx = g & 0x03;
                int gy = g >> 2;
                for (int h = g ; h < 16; ++h) {
                    int hx = h & 0x03;
                    int hy = h >> 2;
                    SkPath path, out;
                    path.setFillType(SkPath::kWinding_FillType);
                    path.moveTo(SkIntToScalar(ax), SkIntToScalar(ay));
                    path.lineTo(SkIntToScalar(bx), SkIntToScalar(by));
                    path.lineTo(SkIntToScalar(cx), SkIntToScalar(cy));
                    path.lineTo(SkIntToScalar(dx), SkIntToScalar(dy));
                    path.close();
                    path.moveTo(SkIntToScalar(ex), SkIntToScalar(ey));
                    path.lineTo(SkIntToScalar(fx), SkIntToScalar(fy));
                    path.lineTo(SkIntToScalar(gx), SkIntToScalar(gy));
                    path.lineTo(SkIntToScalar(hx), SkIntToScalar(hy));
                    path.close();
                   // gdb: set print elements 400
                    char* str = pathStr;
                    str += sprintf(str, "    path.moveTo(%d, %d);\n", ax, ay);
                    str += sprintf(str, "    path.lineTo(%d, %d);\n", bx, by);
                    str += sprintf(str, "    path.lineTo(%d, %d);\n", cx, cy);
                    str += sprintf(str, "    path.lineTo(%d, %d);\n", dx, dy);
                    str += sprintf(str, "    path.close();\n");
                    str += sprintf(str, "    path.moveTo(%d, %d);\n", ex, ey);
                    str += sprintf(str, "    path.lineTo(%d, %d);\n", fx, fy);
                    str += sprintf(str, "    path.lineTo(%d, %d);\n", gx, gy);
                    str += sprintf(str, "    path.lineTo(%d, %d);\n", hx, hy);
                    str += sprintf(str, "    path.close();\n");
                    outputProgress(state.fPathStr, pathStr, SkPath::kWinding_FillType);
                    testSimplify(path, false, out, state, pathStr);
                    path.setFillType(SkPath::kEvenOdd_FillType);
                    outputProgress(state.fPathStr, pathStr, SkPath::kEvenOdd_FillType);
                    testSimplify(path, true, out, state, pathStr);
                }
            }
        }
    }
}

 virtual int onCharsToGlyphs(const void* chars, Encoding encoding,
                             uint16_t glyphs[], int glyphCount) const override {
     if (glyphs && glyphCount > 0) {
         sk_bzero(glyphs, glyphCount * sizeof(glyphs[0]));
     }
     return 0;
 }

static void copyToMask(const SkRegion& rgn, SkMask* mask) {
    mask->fFormat = SkMask::kA8_Format;

    if (rgn.isEmpty()) {
        mask->fBounds.setEmpty();
        mask->fRowBytes = 0;
        mask->fImage = nullptr;
        return;
    }

    mask->fBounds = rgn.getBounds();
    mask->fRowBytes = mask->fBounds.width();
    mask->fImage = SkMask::AllocImage(mask->computeImageSize());
    sk_bzero(mask->fImage, mask->computeImageSize());

    SkImageInfo info = SkImageInfo::Make(mask->fBounds.width(),
                                         mask->fBounds.height(),
                                         kAlpha_8_SkColorType,
                                         kPremul_SkAlphaType);
    SkBitmap bitmap;
    bitmap.installPixels(info, mask->fImage, mask->fRowBytes);

    // canvas expects its coordinate system to always be 0,0 in the top/left
    // so we translate the rgn to match that before drawing into the mask.
    //
    SkRegion tmpRgn(rgn);
    tmpRgn.translate(-rgn.getBounds().fLeft, -rgn.getBounds().fTop);

    SkCanvas canvas(bitmap);
    canvas.clipRegion(tmpRgn);
    canvas.drawColor(SK_ColorBLACK);
}

// We use this static factory function instead of the regular constructor so
// that we can create the pixel data before calling the constructor. This is
// required so that we can call the base class' constructor with the pixel
// data.
static bool Create(int width, int height, bool is_opaque, SkRasterHandleAllocator::Rec* rec) {
    BITMAPINFOHEADER hdr = { 0 };
    hdr.biSize = sizeof(BITMAPINFOHEADER);
    hdr.biWidth = width;
    hdr.biHeight = -height;  // Minus means top-down bitmap.
    hdr.biPlanes = 1;
    hdr.biBitCount = 32;
    hdr.biCompression = BI_RGB;  // No compression.
    hdr.biSizeImage = 0;
    hdr.biXPelsPerMeter = 1;
    hdr.biYPelsPerMeter = 1;
    void* pixels;
    HBITMAP hbitmap = CreateDIBSection(nullptr, (const BITMAPINFO*)&hdr, 0, &pixels, 0, 0);
    if (!hbitmap) {
        return false;
    }

    size_t row_bytes = width * sizeof(SkPMColor);
    sk_bzero(pixels, row_bytes * height);

    HDC hdc = CreateCompatibleDC(nullptr);
    if (!hdc) {
        DeleteObject(hbitmap);
        return false;
    }
    SetGraphicsMode(hdc, GM_ADVANCED);
    SelectObject(hdc, hbitmap);

    rec->fReleaseProc = DeleteHDCCallback;
    rec->fReleaseCtx = hdc;
    rec->fPixels = pixels;
    rec->fRowBytes = row_bytes;
    rec->fHandle = hdc;
    return true;
}