C++ SkPaint::setAntiAlias方法代码示例

static void show_fill(SkCanvas* canvas, bool doAA) {
    SkRandom rand;
    SkPaint paint;
    paint.setAntiAlias(doAA);
    
    for (int i = 0; i < 50; ++i) {
        SkRect r;
        SkPath p;
        
        r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
                  rand.nextUScalar1() * W, rand.nextUScalar1() * H);
        paint.setColor(rand.nextU());
        canvas->drawRect(r, paint);
        
        r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
                  rand.nextUScalar1() * W, rand.nextUScalar1() * H);
        paint.setColor(rand.nextU());
        p.addOval(r);
        canvas->drawPath(p, paint);
    }
}

static SkScalar draw_row(SkCanvas* canvas, const SkBitmap& bm) {
    SkAutoCanvasRestore acr(canvas, true);

    SkPaint paint;
    SkScalar x = 0;
    const int scale = 32;

    paint.setAntiAlias(true);
    const char* name = sk_tool_utils::colortype_name(bm.colorType());
    canvas->drawText(name, strlen(name), x, SkIntToScalar(bm.height())*scale*5/8,
                     paint);
    canvas->translate(SkIntToScalar(48), 0);

    canvas->scale(SkIntToScalar(scale), SkIntToScalar(scale));

    x += draw_set(canvas, bm, 0, &paint);
    paint.reset();
    paint.setAlpha(0x80);
    draw_set(canvas, bm, x, &paint);
    return x * scale / 3;
}

static void texteffect_slide(SkCanvas* canvas) {
    const char* str = "Google";
    size_t len = strlen(str);
    SkScalar x = 20;
    SkScalar y = 80;
    SkPaint paint;
    paint.setTypeface(SkTypeface::MakeFromName("Georgia",
                                               SkFontStyle::FromOldStyle(SkTypeface::kItalic)));
    paint.setTextSize(75);
    paint.setAntiAlias(true);
    paint.setColor(SK_ColorBLUE);
    for (size_t i = 0; i < SK_ARRAY_COUNT(gRastProcs); i++) {
        apply_shader(&paint, (int)i);
        canvas->drawText(str, len, x, y, paint);
        y += 80;
        if (i == 4) {
            x += 320;
            y = 80;
        }
    }
}

    void onDraw(SkCanvas* canvas) override {
        SkPoint pts[2] = { { 0, 0 },
                           { SkIntToScalar(100), SkIntToScalar(100) }
        };
        SkShader::TileMode tm = SkShader::kClamp_TileMode;
        SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
        SkPaint paint;
        paint.setAntiAlias(true);

        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
        for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
            canvas->save();
            for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
                paint.setShader(gGradMakers[j](pts, gGradData[i], tm));
                canvas->drawRect(r, paint);
                canvas->translate(0, SkIntToScalar(120));
            }
            canvas->restore();
            canvas->translate(SkIntToScalar(120), 0);
        }
    }

    SkBitmap createRandomCharIcon() {
        int size = cardHeight - (dp(10) * 2);
        SkBitmap bitmap = TestUtils::createSkBitmap(size, size);
        SkCanvas canvas(bitmap);
        canvas.clear(0);

        SkPaint paint;
        paint.setAntiAlias(true);
        SkColor randomColor = BrightColors[rand() % BrightColorsCount];
        paint.setColor(randomColor);
        canvas.drawCircle(size / 2, size / 2, size / 2, paint);

        bool bgDark = SkColorGetR(randomColor) + SkColorGetG(randomColor) + SkColorGetB(randomColor)
                < 128 * 3;
        paint.setColor(bgDark ? Color::White : Color::Grey_700);
        paint.setTextAlign(SkPaint::kCenter_Align);
        paint.setTextSize(size / 2);
        char charToShow = 'A' + (rand() % 26);
        canvas.drawText(&charToShow, 1, size / 2, /*approximate centering*/ size * 0.7, paint);
        return bitmap;
    }

static SkBitmap createBitmap(int n) {
    SkBitmap bitmap;
    bitmap.allocN32Pixels(n, n);
    bitmap.eraseColor(SK_ColorGREEN);

    SkCanvas canvas(bitmap);
    SkRect r;
    r.set(0, 0, SkIntToScalar(n), SkIntToScalar(n));
    SkPaint paint;
    paint.setAntiAlias(true);

    paint.setColor(SK_ColorRED);
    canvas.drawOval(r, paint);
    paint.setColor(SK_ColorBLUE);
    paint.setStrokeWidth(SkIntToScalar(n)/15);
    paint.setStyle(SkPaint::kStroke_Style);
    canvas.drawLine(0, 0, r.fRight, r.fBottom, paint);
    canvas.drawLine(0, r.fBottom, r.fRight, 0, paint);

    return bitmap;
}

static void test_drawPathEmpty(skiatest::Reporter*, SkCanvas* canvas) {
    // Filling an empty path should not crash.
    SkPaint paint;
    canvas->drawRect(SkRect(), paint);
    canvas->drawPath(SkPath(), paint);
    canvas->drawOval(SkRect(), paint);
    canvas->drawRect(SkRect(), paint);
    canvas->drawRRect(SkRRect(), paint);

    // Stroking an empty path should not crash.
    paint.setAntiAlias(true);
    paint.setStyle(SkPaint::kStroke_Style);
    paint.setColor(SK_ColorGRAY);
    paint.setStrokeWidth(SkIntToScalar(20));
    paint.setStrokeJoin(SkPaint::kRound_Join);
    canvas->drawRect(SkRect(), paint);
    canvas->drawPath(SkPath(), paint);
    canvas->drawOval(SkRect(), paint);
    canvas->drawRect(SkRect(), paint);
    canvas->drawRRect(SkRRect(), paint);
}

/*
 *  Inspired by http://code.google.com/p/chromium/issues/detail?id=112145
 */
static void flower(SkCanvas* canvas, const SkPath& path,
                   SkScalar intervals[2], SkPaint::Join join) {
        SkPathEffect* pe = SkDashPathEffect::Create(intervals, 2, 0);

        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setStyle(SkPaint::kStroke_Style);
        paint.setStrokeJoin(join);
        paint.setStrokeWidth(42);
        canvas->drawPath(path, paint);

        paint.setColor(SK_ColorRED);
        paint.setStrokeWidth(21);
        paint.setPathEffect(pe)->unref();
        canvas->drawPath(path, paint);

        paint.setColor(SK_ColorGREEN);
        paint.setPathEffect(nullptr);
        paint.setStrokeWidth(0);
        canvas->drawPath(path, paint);
}

    virtual void onDraw(const int loops, SkCanvas* canvas) {
        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) {
                SkMaskFilter* mf = SkBlurMaskFilter::Create(fStyle,
                                            SkBlurMask::ConvertRadiusToSigma(fRadius),
                                            fFlags);
                paint.setMaskFilter(mf)->unref();
            }
            canvas->drawOval(r, paint);
        }
    }

static void drawSomething(SkCanvas* canvas) {
    SkPaint paint;

    canvas->save();
    canvas->scale(0.5f, 0.5f);
    canvas->drawBitmap(make_bitmap(), 0, 0, NULL);
    canvas->restore();

    const char beforeStr[] = "before circle";
    const char afterStr[] = "after circle";

    paint.setAntiAlias(true);

    paint.setColor(SK_ColorRED);
    canvas->drawData(beforeStr, sizeof(beforeStr));
    canvas->drawCircle(SkIntToScalar(kBitmapSize/2), SkIntToScalar(kBitmapSize/2), SkIntToScalar(kBitmapSize/3), paint);
    canvas->drawData(afterStr, sizeof(afterStr));
    paint.setColor(SK_ColorBLACK);
    paint.setTextSize(SkIntToScalar(kBitmapSize/3));
    canvas->drawText("Picture", 7, SkIntToScalar(kBitmapSize/2), SkIntToScalar(kBitmapSize/4), paint);
}

static void
Transform(DataSourceSurface* aDest,
          DataSourceSurface* aSource,
          const gfx3DMatrix& aTransform,
          const Point& aDestOffset)
{
  if (aTransform.IsSingular()) {
    return;
  }

  IntSize destSize = aDest->GetSize();
  SkImageInfo destInfo = SkImageInfo::Make(destSize.width,
                                           destSize.height,
                                           kBGRA_8888_SkColorType,
                                           kPremul_SkAlphaType);
  SkBitmap destBitmap;
  destBitmap.setInfo(destInfo, aDest->Stride());
  destBitmap.setPixels((uint32_t*)aDest->GetData());
  SkCanvas destCanvas(destBitmap);

  IntSize srcSize = aSource->GetSize();
  SkImageInfo srcInfo = SkImageInfo::Make(srcSize.width,
                                          srcSize.height,
                                          kBGRA_8888_SkColorType,
                                          kPremul_SkAlphaType);
  SkBitmap src;
  src.setInfo(srcInfo, aSource->Stride());
  src.setPixels((uint32_t*)aSource->GetData());

  gfx3DMatrix transform = aTransform;
  transform.TranslatePost(Point3D(-aDestOffset.x, -aDestOffset.y, 0));
  destCanvas.setMatrix(Matrix3DToSkia(transform));

  SkPaint paint;
  paint.setXfermodeMode(SkXfermode::kSrc_Mode);
  paint.setAntiAlias(true);
  paint.setFilterLevel(SkPaint::kLow_FilterLevel);
  SkRect destRect = SkRect::MakeXYWH(0, 0, srcSize.width, srcSize.height);
  destCanvas.drawBitmapRectToRect(src, nullptr, destRect, &paint);
}

static void paintSkBitmap(PlatformContextSkia* platformContext, const NativeImageSkia& bitmap, const SkIRect& srcRect, const SkRect& destRect, const SkXfermode::Mode& compOp)
{
#if PLATFORM(CHROMIUM)
    TRACE_EVENT("paintSkBitmap", platformContext, 0);
#endif
    SkPaint paint;
    paint.setXfermodeMode(compOp);
    paint.setAlpha(platformContext->getNormalizedAlpha());
    paint.setLooper(platformContext->getDrawLooper());
    // only antialias if we're rotated or skewed
    paint.setAntiAlias(hasNon90rotation(platformContext));

    SkCanvas* canvas = platformContext->canvas();

    ResamplingMode resampling;
    if (platformContext->isAccelerated())
        resampling = RESAMPLE_LINEAR;
    else
        resampling = platformContext->printing() ? RESAMPLE_NONE :
            computeResamplingMode(platformContext, bitmap, srcRect.width(), srcRect.height(), SkScalarToFloat(destRect.width()), SkScalarToFloat(destRect.height()));
    if (resampling == RESAMPLE_NONE) {
      // FIXME: This is to not break tests (it results in the filter bitmap flag
      // being set to true). We need to decide if we respect RESAMPLE_NONE
      // being returned from computeResamplingMode.
        resampling = RESAMPLE_LINEAR;
    }
    resampling = limitResamplingMode(platformContext, resampling);
    paint.setFilterBitmap(resampling == RESAMPLE_LINEAR);
    if (resampling == RESAMPLE_AWESOME)
        drawResampledBitmap(*canvas, paint, bitmap, srcRect, destRect);
    else {
        // No resampling necessary, we can just draw the bitmap. We want to
        // filter it if we decided to do linear interpolation above, or if there
        // is something interesting going on with the matrix (like a rotation).
        // Note: for serialization, we will want to subset the bitmap first so
        // we don't send extra pixels.
        canvas->drawBitmapRect(bitmap.bitmap(), &srcRect, destRect, &paint);
    }
    platformContext->didDrawRect(destRect, paint, &bitmap.bitmap());
}

    void onDraw(SkCanvas* canvas) override {
        SkPaint paint;
        SkPath path;
        paint.setStyle(SkPaint::Style::kStroke_Style);
        canvas->translate(5.0f, 5.0f);
        const SkScalar size = 60.0f;
        for (int i = 0; i < 2; i++) {
            paint.setAntiAlias(i == 1);
            for (int j = 0; j < 4; j++) {
                SkScalar scale = 4.0f - j;
                paint.setStrokeWidth(4.0f / scale);
                canvas->save();
                canvas->translate(size / 2.0f, size / 2.0f);
                canvas->scale(scale, scale);
                draw_path(size / 2.0f / scale, canvas, paint);
                canvas->restore();

                canvas->save();
                canvas->translate(size / 2.0f, 80.0f + size / 2.0f);
                canvas->scale(scale, scale);
                canvas->drawCircle(0.0f, 0.0f, size / 2.0f / scale, paint);
                canvas->restore();

                canvas->save();
                canvas->translate(0.0f, 160.0f);
                canvas->scale(scale, scale);
                canvas->drawRect(SkRect::MakeXYWH(0.0f, 0.0f, size / scale, size / scale), paint);
                canvas->restore();

                canvas->save();
                canvas->translate(0.0f, 240.0f);
                canvas->scale(scale, scale);
                canvas->drawLine(0.0f, 0.0f, size / scale, size / scale, paint);
                canvas->restore();

                canvas->translate(80.0f, 0.0f);
            }
        }

    }

static SkPaint make_paint() {
    SkPaint paint;
    paint.setHinting(make_paint_hinting());
    paint.setAntiAlias(make_bool());
    paint.setDither(make_bool());
    paint.setLinearText(make_bool());
    paint.setSubpixelText(make_bool());
    paint.setLCDRenderText(make_bool());
    paint.setEmbeddedBitmapText(make_bool());
    paint.setAutohinted(make_bool());
    paint.setVerticalText(make_bool());
    paint.setFakeBoldText(make_bool());
    paint.setDevKernText(make_bool());
    paint.setFilterQuality(make_filter_quality());
    paint.setStyle(make_paint_style());
    paint.setColor(make_color());
    paint.setStrokeWidth(make_scalar());
    paint.setStrokeMiter(make_scalar());
    paint.setStrokeCap(make_paint_cap());
    paint.setStrokeJoin(make_paint_join());
    paint.setColorFilter(make_color_filter());
    paint.setBlendMode(make_xfermode());
    paint.setPathEffect(make_path_effect());
    paint.setMaskFilter(make_mask_filter());

    if (false) {
        // our validating buffer does not support typefaces yet, so skip this for now
        paint.setTypeface(SkTypeface::MakeFromName(make_font_name().c_str(),
                                                   make_typeface_style()));
    }

    paint.setImageFilter(make_image_filter());
    sk_sp<SkData> data(make_3Dlut(nullptr, make_bool(), make_bool(), make_bool()));
    paint.setTextAlign(make_paint_align());
    paint.setTextSize(make_scalar());
    paint.setTextScaleX(make_scalar());
    paint.setTextSkewX(make_scalar());
    paint.setTextEncoding(make_paint_text_encoding());
    return paint;
}

    virtual void onDraw(SkCanvas* canvas) {
        this->drawBG(canvas);

        canvas->translate(this->width()/2, this->height()/2);

        Sk3DView    view;
        view.rotateX(fRX);
        view.rotateY(fRY);
        view.applyToCanvas(canvas);
        
        SkPaint paint;
        SkScalar rad = SkIntToScalar(50);
        SkScalar dim = rad*2;
        if (fShaders.count() > 0) {
            bool frontFace = view.dotWithNormal(0, 0, SK_Scalar1) < 0;
            if (frontFace != fFrontFace) {
                fFrontFace = frontFace;
                fShaderIndex = (fShaderIndex + 1) % fShaders.count();
            }
        
            paint.setAntiAlias(true);
            paint.setShader(fShaders[fShaderIndex]);
#if 0
            canvas->drawCircle(0, 0, rad, paint);
            canvas->drawCircle(-dim, -dim, rad, paint);
            canvas->drawCircle(-dim,  dim, rad, paint);
            canvas->drawCircle( dim, -dim, rad, paint);
            canvas->drawCircle( dim,  dim, rad, paint);
#else
            SkRect r = { -150, -150, 150, 150 };
            canvas->drawRoundRect(r, 30, 30, paint);
#endif
        }
        
        fRY += SampleCode::GetAnimSecondsDelta() * 90;
        if (fRY >= SkIntToScalar(360)) {
            fRY = 0;
        }
        this->inval(NULL);
    }