C++ SkString::appendScalar方法代码示例

SkString* SkObjectParser::PointsToString(const SkPoint pts[], size_t count) {
    SkString* mPoints = new SkString("SkPoints pts[]: ");
    for (unsigned int i = 0; i < count; i++) {
        mPoints->append("(");
        mPoints->appendScalar(pts[i].fX);
        mPoints->append(",");
        mPoints->appendScalar(pts[i].fY);
        mPoints->append(")");
    }
    return mPoints;
}

SkString* SkObjectParser::RectToString(const SkRect& rect, const char* title) {

    SkString* mRect = new SkString;

    if (nullptr == title) {
        mRect->append("SkRect: ");
    } else {
        mRect->append(title);
    }
    mRect->append("(");
    mRect->appendScalar(rect.left());
    mRect->append(", ");
    mRect->appendScalar(rect.top());
    mRect->append(", ");
    mRect->appendScalar(rect.right());
    mRect->append(", ");
    mRect->appendScalar(rect.bottom());
    mRect->append(")");
    return mRect;
}

void SkSVGSVG::translate(SkSVGParser& parser, bool defState) {
    SkScalar height, width;
    SkScalar viewBox[4];
    const char* hSuffix = SkParse::FindScalar(f_height.c_str(), &height);
    if (strcmp(hSuffix, "pt") == 0)
        height = SkScalarMulDiv(height, SK_Scalar1 * 72, SK_Scalar1 * 96);
    const char* wSuffix = SkParse::FindScalar(f_width.c_str(), &width);
    if (strcmp(wSuffix, "pt") == 0)
        width = SkScalarMulDiv(width, SK_Scalar1 * 72, SK_Scalar1 * 96);
    SkParse::FindScalars(f_viewBox.c_str(), viewBox, 4);
    SkRect box;
    box.fLeft = SkScalarDiv(viewBox[0], width);
    box.fTop = SkScalarDiv(viewBox[1], height);
    box.fRight = SkScalarDiv(viewBox[2], width);
    box.fBottom = SkScalarDiv(viewBox[3], height);
    if (box.fLeft == 0 && box.fTop == 0 && 
        box.fRight == SK_Scalar1 && box.fBottom == SK_Scalar1) 
            return;
    parser._startElement("matrix");
    if (box.fLeft != 0) {
        SkString x;
        x.appendScalar(box.fLeft);
        parser._addAttributeLen("translateX", x.c_str(), x.size());
    }
    if (box.fTop != 0) {
        SkString y;
        y.appendScalar(box.fTop);
        parser._addAttributeLen("translateY", y.c_str(), y.size());
    }
    if (box.fRight != SK_Scalar1) {
        SkString x;
        x.appendScalar(box.fRight);
        parser._addAttributeLen("scaleX", x.c_str(), x.size());
    }
    if (box.fBottom != SK_Scalar1) {
        SkString y;
        y.appendScalar(box.fBottom);
        parser._addAttributeLen("scaleY", y.c_str(), y.size());
    }
    parser._endElement();   
}

static void show_k_text(SkCanvas* canvas, SkScalar x, SkScalar y, const SkScalar k[]) {
    SkPaint paint;
    paint.setTextSize(SkIntToScalar(24));
    paint.setAntiAlias(true);
    for (int i = 0; i < 4; ++i) {
        SkString str;
        str.appendScalar(k[i]);
        SkScalar width = paint.measureText(str.c_str(), str.size());
        canvas->drawText(str.c_str(), str.size(), x, y + paint.getTextSize(), paint);
        x += width + SkIntToScalar(10);
    }
}

/**
 *  Returns PS function code that applies inverse perspective
 *  to a x, y point.
 *  The function assumes that the stack has at least two elements,
 *  and that the top 2 elements are numeric values.
 *  After executing this code on a PS stack, the last 2 elements are updated
 *  while the rest of the stack is preserved intact.
 *  inversePerspectiveMatrix is the inverse perspective matrix.
 */
static SkString apply_perspective_to_coordinates(
        const SkMatrix& inversePerspectiveMatrix) {
    SkString code;
    if (!inversePerspectiveMatrix.hasPerspective()) {
        return code;
    }

    // Perspective matrix should be:
    // 1   0  0
    // 0   1  0
    // p0 p1 p2

    const SkScalar p0 = inversePerspectiveMatrix[SkMatrix::kMPersp0];
    const SkScalar p1 = inversePerspectiveMatrix[SkMatrix::kMPersp1];
    const SkScalar p2 = inversePerspectiveMatrix[SkMatrix::kMPersp2];

    // y = y / (p2 + p0 x + p1 y)
    // x = x / (p2 + p0 x + p1 y)

    // Input on stack: x y
    code.append(" dup ");               // x y y
    code.appendScalar(p1);              // x y y p1
    code.append(" mul "                 // x y y*p1
                " 2 index ");           // x y y*p1 x
    code.appendScalar(p0);              // x y y p1 x p0
    code.append(" mul ");               // x y y*p1 x*p0
    code.appendScalar(p2);              // x y y p1 x*p0 p2
    code.append(" add "                 // x y y*p1 x*p0+p2
                "add "                  // x y y*p1+x*p0+p2
                "3 1 roll "             // y*p1+x*p0+p2 x y
                "2 index "              // z x y y*p1+x*p0+p2
                "div "                  // y*p1+x*p0+p2 x y/(y*p1+x*p0+p2)
                "3 1 roll "             // y/(y*p1+x*p0+p2) y*p1+x*p0+p2 x
                "exch "                 // y/(y*p1+x*p0+p2) x y*p1+x*p0+p2
                "div "                  // y/(y*p1+x*p0+p2) x/(y*p1+x*p0+p2)
                "exch\n");              // x/(y*p1+x*p0+p2) y/(y*p1+x*p0+p2)
    return code;
}

    void onDrawContent(SkCanvas* canvas) override {
        fCell.set(this->height() / 2, this->height() / 2);

        SkScalar trans[2];
        fTrans.timeToValues(fCurrTime, trans);

        for (int y = 0; y < 2; ++y) {
            for (int x = 0; x < 2; ++x) {
                int index = y * 2 + x;
                SkAutoCanvasRestore acr(canvas, true);
                canvas->translate(fCell.width() * x, fCell.height() * y);
                SkRect r = SkRect::MakeWH(fCell.width(), fCell.height());
                r.inset(4, 4);
                canvas->clipRect(r);
                this->drawHere(canvas, SkFilterQuality(index), trans[0], trans[1]);
            }
        }

        this->drawBorders(canvas);

        const SkScalar textX = fCell.width() * 2 + 30;

        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setTextSize(36);
        SkString str;
        str.appendScalar(fScale);
        canvas->drawText(str.c_str(), str.size(), textX, 100, paint);
        str.reset(); str.appendScalar(fAngle);
        canvas->drawText(str.c_str(), str.size(), textX, 150, paint);

        str.reset(); str.appendScalar(trans[0]);
        canvas->drawText(str.c_str(), str.size(), textX, 200, paint);
        str.reset(); str.appendScalar(trans[1]);
        canvas->drawText(str.c_str(), str.size(), textX, 250, paint);
    }

void draw(SkCanvas* canvas) {
    SkMatrix m;
    m.setIdentity();
    m.set(SkMatrix::kMPersp0, -0.004f);
    SkAutoCanvasRestore autoRestore(canvas, true);
    canvas->translate(22, 144);
    SkPaint black;
    black.setAntiAlias(true);
    black.setTextSize(24);
    SkPaint gray = black;
    gray.setColor(0xFF9f9f9f);
    SkString string;
    string.appendScalar(m.getPerspX());
    canvas->drawString(string, 0, -72, gray);
    canvas->concat(m);
    canvas->drawString(string, 0, 0, black);
}

    void onDrawContent(SkCanvas* canvas) override {
        SkASSERT(fParent);
        SkScalar x = fSliderRange * (*fOutput - fMin) / (fMax - fMin);
        fSlider.offsetTo(SkScalarPin(x, 0.0f, fSliderRange), fSlider.fTop);

        SkString valueStr;
        valueStr.appendScalar(*fOutput);
        this->drawLabel(canvas, valueStr);

        SkPaint sliderPaint;
        sliderPaint.setColor(0xFFF3F3F3);
        canvas->drawRect(fSlider, sliderPaint);

        SkPaint ctrlRegionPaint;
        ctrlRegionPaint.setColor(0xFFFFFFFF);
        ctrlRegionPaint.setStyle(SkPaint::kStroke_Style);
        ctrlRegionPaint.setStrokeWidth(2.0f);
        canvas->drawRect(fCtrlRegion, ctrlRegionPaint);
    }

SkString* SkObjectParser::RRectToString(const SkRRect& rrect, const char* title) {

    SkString* mRRect = new SkString;

    if (nullptr == title) {
        mRRect->append("SkRRect (");
        if (rrect.isEmpty()) {
            mRRect->append("empty");
        } else if (rrect.isRect()) {
            mRRect->append("rect");
        } else if (rrect.isOval()) {
            mRRect->append("oval");
        } else if (rrect.isSimple()) {
            mRRect->append("simple");
        } else if (rrect.isNinePatch()) {
            mRRect->append("nine-patch");
        } else {
            SkASSERT(rrect.isComplex());
            mRRect->append("complex");
        }
        mRRect->append("): ");
    } else {
        mRRect->append(title);
    }
    mRRect->append("(");
    mRRect->appendScalar(rrect.rect().left());
    mRRect->append(", ");
    mRRect->appendScalar(rrect.rect().top());
    mRRect->append(", ");
    mRRect->appendScalar(rrect.rect().right());
    mRRect->append(", ");
    mRRect->appendScalar(rrect.rect().bottom());
    mRRect->append(") radii: (");
    for (int i = 0; i < 4; ++i) {
        const SkVector& radii = rrect.radii((SkRRect::Corner) i);
        mRRect->appendScalar(radii.fX);
        mRRect->append(", ");
        mRRect->appendScalar(radii.fY);
        if (i < 3) {
            mRRect->append(", ");
        }
    }
    mRRect->append(")");
    return mRRect;
}

bool SkWStream::writeScalarAsText(SkScalar value)
{
    SkString    tmp;
    tmp.appendScalar(value);
    return this->write(tmp.c_str(), tmp.size());
}

void SkDebugger::getOverviewText(const SkTDArray<double>* typeTimes,
                                 double totTime,
                                 SkString* overview,
                                 int numRuns) {
    const SkTDArray<SkDrawCommand*>& commands = this->getDrawCommands();

    SkTDArray<int> counts;
    counts.setCount(LAST_DRAWTYPE_ENUM+1);
    for (int i = 0; i < LAST_DRAWTYPE_ENUM+1; ++i) {
        counts[i] = 0;
    }

    for (int i = 0; i < commands.count(); i++) {
        counts[commands[i]->getType()]++;
    }

    overview->reset();
    int total = 0;
#ifdef SK_DEBUG
    double totPercent = 0, tempSum = 0;
#endif
    for (int i = 0; i < LAST_DRAWTYPE_ENUM+1; ++i) {
        if (0 == counts[i]) {
            // if there were no commands of this type then they should've consumed no time
            SkASSERT(NULL == typeTimes || 0.0 == (*typeTimes)[i]);
            continue;
        }

        overview->append(SkDrawCommand::GetCommandString((DrawType) i));
        overview->append(": ");
        overview->appendS32(counts[i]);
        if (NULL != typeTimes && totTime >= 0.0) {
            overview->append(" - ");
            overview->appendf("%.2f", (*typeTimes)[i]/(float)numRuns);
            overview->append("ms");
            overview->append(" - ");
            double percent = 100.0*(*typeTimes)[i]/totTime;
            overview->appendf("%.2f", percent);
            overview->append("%");
#ifdef SK_DEBUG
            totPercent += percent;
            tempSum += (*typeTimes)[i];
#endif
        }
        overview->append("<br/>");
        total += counts[i];
    }
#ifdef SK_DEBUG
    if (NULL != typeTimes) {
        SkASSERT(SkScalarNearlyEqual(SkDoubleToScalar(totPercent),
                                     SkDoubleToScalar(100.0)));
        SkASSERT(SkScalarNearlyEqual(SkDoubleToScalar(tempSum),
                                     SkDoubleToScalar(totTime)));
    }
#endif

    if (totTime > 0.0) {
        overview->append("Total Time: ");
        overview->appendf("%.2f", totTime/(float)numRuns);
        overview->append("ms");
#ifdef SK_DEBUG
        overview->append(" ");
        overview->appendScalar(SkDoubleToScalar(totPercent));
        overview->append("% ");
#endif
        overview->append("<br/>");
    }

    SkString totalStr;
    totalStr.append("Total Draw Commands: ");
    totalStr.appendScalar(SkDoubleToScalar(total));
    totalStr.append("<br/>");
    overview->insert(0, totalStr);

    overview->append("<br/>");
    overview->append("SkPicture Width: ");
    overview->appendS32(pictureWidth());
    overview->append("px<br/>");
    overview->append("SkPicture Height: ");
    overview->appendS32(pictureHeight());
    overview->append("px");
}

void SkXMLWriter::addScalarAttribute(const char name[], SkScalar value)
{
    SkString    tmp;
    tmp.appendScalar(value);
    this->addAttribute(name, tmp.c_str());
}

SkString* SkObjectParser::PathToString(const SkPath& path) {
    SkString* mPath = new SkString("Path (");

    static const char* gFillStrings[] = {
        "Winding", "EvenOdd", "InverseWinding", "InverseEvenOdd"
    };

    mPath->append(gFillStrings[path.getFillType()]);
    mPath->append(", ");

    static const char* gConvexityStrings[] = {
        "Unknown", "Convex", "Concave"
    };
    SkASSERT(SkPath::kConcave_Convexity == 2);

    mPath->append(gConvexityStrings[path.getConvexity()]);
    mPath->append(", ");

    if (path.isRect(nullptr)) {
        mPath->append("isRect, ");
    } else {
        mPath->append("isNotRect, ");
    }

    mPath->appendS32(path.countVerbs());
    mPath->append("V, ");
    mPath->appendS32(path.countPoints());
    mPath->append("P): ");

    static const char* gVerbStrings[] = {
        "Move", "Line", "Quad", "Conic", "Cubic", "Close", "Done"
    };
    static const int gPtsPerVerb[] = { 1, 1, 2, 2, 3, 0, 0 };
    static const int gPtOffsetPerVerb[] = { 0, 1, 1, 1, 1, 0, 0 };
    SkASSERT(SkPath::kDone_Verb == 6);

    SkPath::Iter iter(const_cast<SkPath&>(path), false);
    SkPath::Verb verb;
    SkPoint points[4];

    for(verb = iter.next(points, false);
        verb != SkPath::kDone_Verb;
        verb = iter.next(points, false)) {

        mPath->append(gVerbStrings[verb]);
        mPath->append(" ");

        for (int i = 0; i < gPtsPerVerb[verb]; ++i) {
            mPath->append("(");
            mPath->appendScalar(points[gPtOffsetPerVerb[verb]+i].fX);
            mPath->append(", ");
            mPath->appendScalar(points[gPtOffsetPerVerb[verb]+i].fY);
            mPath->append(")");
        }

        if (SkPath::kConic_Verb == verb) {
            mPath->append("(");
            mPath->appendScalar(iter.conicWeight());
            mPath->append(")");
        }

        mPath->append(" ");
    }

    SkString* boundStr = SkObjectParser::RectToString(path.getBounds(), "    Bound: ");

    if (boundStr) {
        mPath->append(*boundStr);
        delete boundStr;
    }

    return mPath;
}

static void TestString(skiatest::Reporter* reporter) {
    SkString    a;
    SkString    b((size_t)0);
    SkString    c("");
    SkString    d(NULL, 0);

    REPORTER_ASSERT(reporter, a.isEmpty());
    REPORTER_ASSERT(reporter, a == b && a == c && a == d);

    a.set("hello");
    b.set("hellox", 5);
    c.set(a);
    d.resize(5);
    memcpy(d.writable_str(), "helloz", 5);

    REPORTER_ASSERT(reporter, !a.isEmpty());
    REPORTER_ASSERT(reporter, a.size() == 5);
    REPORTER_ASSERT(reporter, a == b && a == c && a == d);
    REPORTER_ASSERT(reporter, a.equals("hello", 5));
    REPORTER_ASSERT(reporter, a.equals("hello"));
    REPORTER_ASSERT(reporter, !a.equals("help"));

    SkString    e(a);
    SkString    f("hello");
    SkString    g("helloz", 5);

    REPORTER_ASSERT(reporter, a == e && a == f && a == g);

    b.set("world");
    c = b;
    REPORTER_ASSERT(reporter, a != b && a != c && b == c);

    a.append(" world");
    e.append("worldz", 5);
    e.insert(5, " ");
    f.set("world");
    f.prepend("hello ");
    REPORTER_ASSERT(reporter, a.equals("hello world") && a == e && a == f);

    a.reset();
    b.resize(0);
    REPORTER_ASSERT(reporter, a.isEmpty() && b.isEmpty() && a == b);

    a.set("a");
    a.set("ab");
    a.set("abc");
    a.set("abcd");

    a.set("");
    a.appendS64(72036854775808LL, 0);
    REPORTER_ASSERT(reporter, a.equals("72036854775808"));

    a.set("");
    a.appendS64(-1844674407370LL, 0);
    REPORTER_ASSERT(reporter, a.equals("-1844674407370"));

    a.set("");
    a.appendS64(73709551616LL, 15);
    REPORTER_ASSERT(reporter, a.equals("000073709551616"));

    a.set("");
    a.appendS64(-429496729612LL, 15);
    REPORTER_ASSERT(reporter, a.equals("-000429496729612"));

    static const struct {
        SkScalar    fValue;
        const char* fString;
    } gRec[] = {
        { 0,            "0" },
        { SK_Scalar1,   "1" },
        { -SK_Scalar1,  "-1" },
        { SK_Scalar1/2, "0.5" },
#ifdef SK_SCALAR_IS_FLOAT
        { 3.4028234e38f,   "3.4028235e+38" },
        { -3.4028234e38f, "-3.4028235e+38" },
#endif
    };
    for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); i++) {
        a.reset();
        a.appendScalar(gRec[i].fValue);
        REPORTER_ASSERT(reporter, a.size() <= SkStrAppendScalar_MaxSize);
//        SkDebugf(" received <%s> expected <%s>\n", a.c_str(), gRec[i].fString);
        REPORTER_ASSERT(reporter, a.equals(gRec[i].fString));
    }
}

SkString* SkObjectParser::ScalarToString(SkScalar x, const char* text) {
    SkString* mScalar = new SkString(text);
    mScalar->append(" ");
    mScalar->appendScalar(x);
    return mScalar;
}