C++ SkRandom::nextRangeScalar方法代码示例

 void onDraw(const int loops, SkCanvas* canvas) override {
     const char* text = "Hamburgefons";
     size_t len = strlen(text);
     SkISize size = canvas->getDeviceSize();
     SkRandom random;
     for (int i = 0; i < loops; ++i) {
         SkPaint paint;
         paint.setXfermode(fXfermode.get());
         paint.setColor(random.nextU());
         if (fAA) {
             // Draw text to exercise AA code paths.
             paint.setAntiAlias(true);
             paint.setTextSize(random.nextRangeScalar(12, 96));
             SkScalar x = random.nextRangeScalar(0, (SkScalar)size.fWidth),
                      y = random.nextRangeScalar(0, (SkScalar)size.fHeight);
             for (int j = 0; j < 1000; ++j) {
                 canvas->drawText(text, len, x, y, paint);
             }
         } else {
             // Draw rects to exercise non-AA code paths.
             SkScalar w = random.nextRangeScalar(50, 100);
             SkScalar h = random.nextRangeScalar(50, 100);
             SkRect rect = SkRect::MakeXYWH(
                 random.nextUScalar1() * (size.fWidth - w),
                 random.nextUScalar1() * (size.fHeight - h),
                 w,
                 h
             );
             for (int j = 0; j < 1000; ++j) {
                 canvas->drawRect(rect, paint);
             }
         }
     }
 }

static void rand_rect(SkRect* rect, SkRandom& rand, SkScalar W, SkScalar H) {
    rect->fLeft   = rand.nextRangeScalar(-W, 2*W);
    rect->fTop    = rand.nextRangeScalar(-H, 2*H);
    rect->fRight  = rect->fLeft + rand.nextRangeScalar(0, W);
    rect->fBottom = rect->fTop + rand.nextRangeScalar(0, H);

    // we integralize rect to make our tests more predictable, since Gather is
    // a little sloppy.
    SkIRect ir;
    rect->round(&ir);
    rect->set(ir);
}

 virtual void onPreDraw() {
     const SkScalar min = -100;
     const SkScalar max = 100;
     SkRandom rand;
     for (size_t i = 0; i < SK_ARRAY_COUNT(fRects); ++i) {
         SkScalar x = rand.nextRangeScalar(min, max);
         SkScalar y = rand.nextRangeScalar(min, max);
         SkScalar w = rand.nextRangeScalar(min, max);
         SkScalar h = rand.nextRangeScalar(min, max);
         fRects[i].setXYWH(x, y, w, h);
     }
 }

// Generates y values for the chart plots.
static void gen_data(SkScalar yAvg, SkScalar ySpread, int count, SkTDArray<SkScalar>* dataPts) {
    dataPts->setCount(count);
    static SkRandom gRandom;
    for (int i = 0; i < count; ++i) {
        (*dataPts)[i] = gRandom.nextRangeScalar(yAvg - SkScalarHalf(ySpread),
                                                yAvg + SkScalarHalf(ySpread));
    }
}

    void onDraw(int loops, SkCanvas* canvas) override {
        SkRandom Random;

        for (int i = 0; i < loops; i++) {
            SkScalar blurSigma = Random.nextRangeScalar(1.5f, 25.0f);
            SkScalar size = Random.nextRangeScalar(20*blurSigma, 50*blurSigma);

            SkScalar x = Random.nextRangeScalar(0.0f, W - size);
            SkScalar y = Random.nextRangeScalar(0.0f, H - size);

            SkRect inner = { x, y, x + size, y + size };

            SkRect outer(inner);
            // outer is always outset either 2x or 4x the blur radius (we go with 2x)
            outer.outset(2*blurSigma, 2*blurSigma);

            SkPath p;

            p.addRect(outer);
            p.addRect(inner);
            p.setFillType(SkPath::kEvenOdd_FillType);

            // This will be used to translate the normal draw outside the
            // clip rect and translate the blurred version back inside
            SkScalar translate = 2.0f * size;

            SkPaint paint;
            paint.setLooper(this->createLooper(-translate, blurSigma));
            paint.setColor(0xff000000 | Random.nextU());
            paint.setAntiAlias(true);

            canvas->save();
            // clip always equals inner rect so we get the inside blur
            canvas->clipRect(inner);
            canvas->translate(translate, 0);
            canvas->drawPath(p, paint);
            canvas->restore();
        }
    }

    void onDraw(SkCanvas* canvas) override {
        SkPaint paint;
        paint.setImageFilter(SkBlurImageFilter::Create(fSigmaX, fSigmaY))->unref();
        canvas->saveLayer(NULL, &paint);
        const char* str = "The quick brown fox jumped over the lazy dog.";

        SkRandom rand;
        SkPaint textPaint;
        textPaint.setAntiAlias(true);
        sk_tool_utils::set_portable_typeface_always(&textPaint);
        for (int i = 0; i < 25; ++i) {
            int x = rand.nextULessThan(WIDTH);
            int y = rand.nextULessThan(HEIGHT);
            textPaint.setColor(sk_tool_utils::color_to_565(rand.nextBits(24) | 0xFF000000));
            textPaint.setTextSize(rand.nextRangeScalar(0, 300));
            canvas->drawText(str, strlen(str), SkIntToScalar(x),
                             SkIntToScalar(y), textPaint);
        }
        canvas->restore();
    }

DEF_SIMPLE_GM_BG(imagemagnifier, canvas, WIDTH, HEIGHT, SK_ColorBLACK) {
        SkPaint filterPaint;
        filterPaint.setImageFilter(
            SkMagnifierImageFilter::Make(
                SkRect::MakeXYWH(SkIntToScalar(100), SkIntToScalar(100),
                                 SkIntToScalar(WIDTH / 2),
                                 SkIntToScalar(HEIGHT / 2)),
                100, nullptr));
        canvas->saveLayer(nullptr, &filterPaint);
        const char* str = "The quick brown fox jumped over the lazy dog.";
        SkRandom rand;
        for (int i = 0; i < 25; ++i) {
            int x = rand.nextULessThan(WIDTH);
            int y = rand.nextULessThan(HEIGHT);
            SkPaint paint;
            sk_tool_utils::set_portable_typeface(&paint);
            paint.setColor(sk_tool_utils::color_to_565(rand.nextBits(24) | 0xFF000000));
            paint.setTextSize(rand.nextRangeScalar(0, 300));
            paint.setAntiAlias(true);
            canvas->drawText(str, strlen(str), SkIntToScalar(x),
                             SkIntToScalar(y), paint);
        }
        canvas->restore();
}

 void onDraw(SkCanvas* canvas) override {
     SkPaint filterPaint;
     filterPaint.setImageFilter(
         SkMagnifierImageFilter::Create(
             SkRect::MakeXYWH(SkIntToScalar(100), SkIntToScalar(100),
                              SkIntToScalar(WIDTH / 2),
                              SkIntToScalar(HEIGHT / 2)),
             100))->unref();
     canvas->saveLayer(NULL, &filterPaint);
     const char* str = "The quick brown fox jumped over the lazy dog.";
     SkRandom rand;
     for (int i = 0; i < 25; ++i) {
         int x = rand.nextULessThan(WIDTH);
         int y = rand.nextULessThan(HEIGHT);
         SkPaint paint;
         sk_tool_utils::set_portable_typeface(&paint);
         paint.setColor(sk_tool_utils::color_to_565(rand.nextBits(24) | 0xFF000000));
         paint.setTextSize(rand.nextRangeScalar(0, 300));
         paint.setAntiAlias(true);
         canvas->drawText(str, strlen(str), SkIntToScalar(x),
                          SkIntToScalar(y), paint);
     }
     canvas->restore();
 }

    void onOnceBeforeDraw() override {
        fPaint.setAntiAlias(true);
        fPaint.setLCDRenderText(fLCD);

        SkISize size = this->getISize();
        SkScalar w = SkIntToScalar(size.fWidth);
        SkScalar h = SkIntToScalar(size.fHeight);

        static_assert(4 == SK_ARRAY_COUNT(fTypefaces), "typeface_cnt");
        fTypefaces[0] = sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle());
        fTypefaces[1] = sk_tool_utils::create_portable_typeface("sans-serif",
                            SkFontStyle::FromOldStyle(SkTypeface::kBold));
        fTypefaces[2] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle());
        fTypefaces[3] = sk_tool_utils::create_portable_typeface("serif",
                            SkFontStyle::FromOldStyle(SkTypeface::kBold));

        SkRandom random;
        for (int i = 0; i < kCnt; ++i) {
            int length = random.nextRangeU(kMinLength, kMaxLength);
            char text[kMaxLength];
            for (int j = 0; j < length; ++j) {
                text[j] = (char)random.nextRangeU('!', 'z');
            }
            fStrings[i].set(text, length);

            fColors[i] = random.nextU();
            fColors[i] |= 0xFF000000;
            fColors[i] = sk_tool_utils::color_to_565(fColors[i]);

            static const SkScalar kMinPtSize = 8.f;
            static const SkScalar kMaxPtSize = 32.f;

            fPtSizes[i] = random.nextRangeScalar(kMinPtSize, kMaxPtSize);

            fTypefaceIndices[i] = random.nextULessThan(SK_ARRAY_COUNT(fTypefaces));

            SkRect r;
            fPaint.setColor(fColors[i]);
            fPaint.setTypeface(fTypefaces[fTypefaceIndices[i]]);
            fPaint.setTextSize(fPtSizes[i]);

            fPaint.measureText(fStrings[i].c_str(), fStrings[i].size(), &r);
            // safeRect is set of x,y positions where we can draw the string without hitting
            // the GM's border.
            SkRect safeRect = SkRect::MakeLTRB(-r.fLeft, -r.fTop, w - r.fRight, h - r.fBottom);
            if (safeRect.isEmpty()) {
                // If we don't fit then just don't worry about how we get cliped to the device
                // border.
                safeRect = SkRect::MakeWH(w, h);
            }
            fPositions[i].fX = random.nextRangeScalar(safeRect.fLeft, safeRect.fRight);
            fPositions[i].fY = random.nextRangeScalar(safeRect.fTop, safeRect.fBottom);

            fClipRects[i] = r;
            fClipRects[i].offset(fPositions[i].fX, fPositions[i].fY);
            fClipRects[i].outset(2.f, 2.f);

            if (fEffectiveClip) {
                fClipRects[i].fRight -= 0.25f * fClipRects[i].width();
            }
        }
    }

    void onDraw(int loops, SkCanvas* canvas) override {
        SkRandom scaleRand;
        SkRandom transRand;
        SkRandom rotRand;

        int width, height;
        if (fUseAtlas) {
            width = kAtlasCellWidth;
            height = kAtlasCellHeight;
        } else {
            width = kCheckerboardWidth;
            height = kCheckerboardHeight;
        }

        SkPaint clearPaint;
        clearPaint.setColor(0xFF000000);
        clearPaint.setAntiAlias(true);

        SkISize size = canvas->getDeviceSize();

        SkScalar maxTransX, maxTransY;

        if (kScale_Type == fType) {
            maxTransX = size.fWidth  - (1.5f * width);
            maxTransY = size.fHeight - (1.5f * height);
        } else if (kTranslate_Type == fType) {
            maxTransX = SkIntToScalar(size.fWidth  - width);
            maxTransY = SkIntToScalar(size.fHeight - height);
        } else {
            SkASSERT(kRotate_Type == fType);
            // Yes, some rotations will be off the top and left sides
            maxTransX = size.fWidth  - SK_ScalarSqrt2 * height;
            maxTransY = size.fHeight - SK_ScalarSqrt2 * height;
        }

        SkMatrix mat;
        SkRect dst = { 0, 0, SkIntToScalar(width), SkIntToScalar(height) };
        SkRect clearRect = { -1.0f, -1.0f, width+1.0f, height+1.0f };
        SkPoint verts[4] = { // for drawVertices path
            { 0, 0 },
            { 0, SkIntToScalar(height) },
            { SkIntToScalar(width), SkIntToScalar(height) },
            { SkIntToScalar(width), 0 }
        };
        uint16_t indices[6] = { 0, 1, 2, 0, 2, 3 };

        SkPaint p;
        p.setColor(0xFF000000);
        p.setFilterQuality(kLow_SkFilterQuality);

        SkPaint p2;         // for drawVertices path
        p2.setColor(0xFF000000);
        p2.setFilterQuality(kLow_SkFilterQuality);
        p2.setShader(SkShader::MakeBitmapShader(fAtlas,
                                                SkShader::kClamp_TileMode,
                                                SkShader::kClamp_TileMode));

        for (int i = 0; i < loops; ++i, ++fNumSaved) {
            if (0 == i % kNumBeforeClear) {
                if (kPartial_Clear == fClear) {
                    for (int j = 0; j < fNumSaved; ++j) {
                        canvas->setMatrix(SkMatrix::I());
                        mat.setTranslate(fSaved[j][0], fSaved[j][1]);

                        if (kScale_Type == fType) {
                            mat.preScale(fSaved[j][2], fSaved[j][2]);
                        } else if (kRotate_Type == fType) {
                            mat.preRotate(fSaved[j][2]);
                        }

                        canvas->concat(mat);
                        canvas->drawRect(clearRect, clearPaint);
                    }
                } else {
                    canvas->clear(0xFF000000);
                }

                fNumSaved = 0;
            }

            SkASSERT(fNumSaved < kNumBeforeClear);

            canvas->setMatrix(SkMatrix::I());

            fSaved[fNumSaved][0] = transRand.nextRangeScalar(0.0f, maxTransX);
            fSaved[fNumSaved][1] = transRand.nextRangeScalar(0.0f, maxTransY);
            if (fAligned) {
                // make the translations integer aligned
                fSaved[fNumSaved][0] = SkScalarFloorToScalar(fSaved[fNumSaved][0]);
                fSaved[fNumSaved][1] = SkScalarFloorToScalar(fSaved[fNumSaved][1]);
            }

            mat.setTranslate(fSaved[fNumSaved][0], fSaved[fNumSaved][1]);

            if (kScale_Type == fType) {
                fSaved[fNumSaved][2] = scaleRand.nextRangeScalar(0.5f, 1.5f);
                mat.preScale(fSaved[fNumSaved][2], fSaved[fNumSaved][2]);
            } else if (kRotate_Type == fType) {
                fSaved[fNumSaved][2] = rotRand.nextRangeScalar(0.0f, 360.0f);
                mat.preRotate(fSaved[fNumSaved][2]);
//.........这里部分代码省略.........