C++ SkPaint::setARGB方法代码示例

    void setupShapePaint(SkCanvas* canvas, GrColor color, SkXfermode::Mode mode, SkPaint* paint) {
        paint->setColor(color);

        if (mode == SkXfermode::kPlus_Mode) {
            // Check for overflow, otherwise we might get confusing AA artifacts.
            int maxSum = SkTMax(SkTMax(SkColorGetA(kBGColor) + SkColorGetA(color),
                                       SkColorGetR(kBGColor) + SkColorGetR(color)),
                                SkTMax(SkColorGetG(kBGColor) + SkColorGetG(color),
                                       SkColorGetB(kBGColor) + SkColorGetB(color)));

            if (maxSum > 255) {
                SkPaint dimPaint;
                dimPaint.setAntiAlias(false);
                dimPaint.setXfermode(SkXfermode::Create(SkXfermode::kDstIn_Mode));
                if (255 != paint->getAlpha()) {
                    // Dim the src and dst colors.
                    dimPaint.setARGB(255 * 255 / maxSum, 0, 0, 0);
                    paint->setAlpha(255 * paint->getAlpha() / maxSum);
                } else {
                    // Just clear the dst, we need to preserve the paint's opacity.
                    dimPaint.setARGB(0, 0, 0, 0);
                }
                canvas->drawRectCoords(-kShapeSpacing/2, -kShapeSpacing/2,
                                       kShapeSpacing/2 + 3 * kShapeTypeSpacing,
                                       kShapeSpacing/2, dimPaint);
            }
        }
    }

static void paintButtonLike(RenderTheme* theme, RenderObject* o, const RenderObject::PaintInfo& i, const IntRect& rect)
{
    SkCanvas* const canvas = i.context->platformContext()->canvas();
    SkPaint paint;
    SkRect skrect;
    const int right = rect.x() + rect.width();
    const int bottom = rect.y() + rect.height();
    SkColor baseColor = SkColorSetARGB(0xff, 0xdd, 0xdd, 0xdd);
    if (o->style()->hasBackground())
        baseColor = o->style()->backgroundColor().rgb();
    double h, s, l;
    Color(baseColor).getHSL(h, s, l);
    // Our standard gradient is from 0xdd to 0xf8. This is the amount of
    // increased luminance between those values.
    SkColor lightColor(brightenColor(h, s, l, 0.105));

    // If the button is too small, fallback to drawing a single, solid color
    if (rect.width() < 5 || rect.height() < 5) {
        paint.setColor(baseColor);
        skrect.set(rect.x(), rect.y(), right, bottom);
        canvas->drawRect(skrect, paint);
        return;
    }

    const int borderAlpha = theme->isHovered(o) ? 0x80 : 0x55;
    paint.setARGB(borderAlpha, 0, 0, 0);
    canvas->drawLine(rect.x() + 1, rect.y(), right - 1, rect.y(), paint);
    canvas->drawLine(right - 1, rect.y() + 1, right - 1, bottom - 1, paint);
    canvas->drawLine(rect.x() + 1, bottom - 1, right - 1, bottom - 1, paint);
    canvas->drawLine(rect.x(), rect.y() + 1, rect.x(), bottom - 1, paint);

    paint.setARGB(0xff, 0, 0, 0);
    SkPoint p[2];
    const int lightEnd = theme->isPressed(o) ? 1 : 0;
    const int darkEnd = !lightEnd;
    p[lightEnd].set(SkIntToScalar(rect.x()), SkIntToScalar(rect.y()));
    p[darkEnd].set(SkIntToScalar(rect.x()), SkIntToScalar(bottom - 1));
    SkColor colors[2];
    colors[0] = lightColor;
    colors[1] = baseColor;

    SkShader* shader = SkGradientShader::CreateLinear(
        p, colors, NULL, 2, SkShader::kClamp_TileMode, NULL);
    paint.setStyle(SkPaint::kFill_Style);
    paint.setShader(shader);
    shader->unref();

    skrect.set(rect.x() + 1, rect.y() + 1, right - 1, bottom - 1);
    canvas->drawRect(skrect, paint);

    paint.setShader(NULL);
    paint.setColor(brightenColor(h, s, l, -0.0588));
    canvas->drawPoint(rect.x() + 1, rect.y() + 1, paint);
    canvas->drawPoint(right - 2, rect.y() + 1, paint);
    canvas->drawPoint(rect.x() + 1, bottom - 2, paint);
    canvas->drawPoint(right - 2, bottom - 2, paint);
}

static void writeFrames() {
    const int scale = 5;

    for (int index = 0; index < (int) SK_ARRAY_COUNT(frameSizes); ++index) {
        SkDRect bounds;
        bool boundsSet = false;
        int frameSize = frameSizes[index];
        for (int fIndex = 0; fIndex < frameSize; ++fIndex) {
            const SkDConic& dC = frames[index][fIndex];
            SkDConic dConic = {{{ {dC.fPts[0].fX * scale, dC.fPts[0].fY * scale },
                {dC.fPts[1].fX * scale, dC.fPts[1].fY * scale },
                {dC.fPts[2].fX * scale, dC.fPts[2].fY * scale }}}, dC.fWeight };
            SkDRect dBounds;
            dBounds.setBounds(dConic);
            if (!boundsSet) {
                bounds = dBounds;
                boundsSet = true;
            } else {
                bounds.add((SkDPoint&) dBounds.fLeft);
                bounds.add((SkDPoint&) dBounds.fRight);
            }
        }
        bounds.fLeft -= 10;
        bounds.fTop -= 10;
        bounds.fRight += 10;
        bounds.fBottom += 10;
        SkBitmap bitmap;
        bitmap.tryAllocPixels(SkImageInfo::MakeN32Premul(
              SkScalarRoundToInt(SkDoubleToScalar(bounds.width())),
              SkScalarRoundToInt(SkDoubleToScalar(bounds.height()))));
        SkCanvas canvas(bitmap);
        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setStyle(SkPaint::kStroke_Style);
        canvas.translate(SkDoubleToScalar(-bounds.fLeft), SkDoubleToScalar(-bounds.fTop));
        canvas.drawColor(SK_ColorWHITE);
        for (int fIndex = 0; fIndex < frameSize; ++fIndex) {
            const SkDConic& dC = frames[index][fIndex];
            SkDConic dConic = {{{ {dC.fPts[0].fX * scale, dC.fPts[0].fY * scale },
                {dC.fPts[1].fX * scale, dC.fPts[1].fY * scale },
                {dC.fPts[2].fX * scale, dC.fPts[2].fY * scale }}}, dC.fWeight };
            SkPath path;
            path.moveTo(dConic.fPts[0].asSkPoint());
            path.conicTo(dConic.fPts[1].asSkPoint(), dConic.fPts[2].asSkPoint(), dConic.fWeight);
            if (fIndex < 2) {
                paint.setARGB(0x80, 0xFF, 0, 0);
            } else {
                paint.setARGB(0x80, 0, 0, 0xFF);
            }
            canvas.drawPath(path, paint);
        }
        SkString filename("c:\\Users\\caryclark\\Documents\\");
        filename.appendf("f%d.png", index);
        SkImageEncoder::EncodeFile(filename.c_str(), bitmap, SkImageEncoder::kPNG_Type, 100);
    }
}

    void onDraw(SkCanvas* canvas) override {
        const SkAlpha kAlphaValue[] = { 0xFF, 0x40 };

        const SkScalar margin = 15;
        canvas->translate(margin, margin);

        SkPaint paint;
        for (int p = 0; p < fPaths.count(); ++p) {
            canvas->save();
            for (size_t a = 0; a < SK_ARRAY_COUNT(kAlphaValue); ++a) {
                paint.setARGB(kAlphaValue[a], 0, 0, 0);
                for (int aa = 0; aa < 2; ++aa) {
                    paint.setAntiAlias(SkToBool(aa));
                    for (int fh = 0; fh < 2; ++fh) {
                        paint.setStyle(fh ? SkPaint::kStroke_Style : SkPaint::kFill_Style);

                        const SkRect& bounds = fPaths[p].getBounds();
                        canvas->save();
                        canvas->translate(-bounds.fLeft, -bounds.fTop);
                        canvas->drawPath(fPaths[p], paint);
                        canvas->restore();

                        canvas->translate(110, 0);
                    }
                }
            }
            canvas->restore();
            canvas->translate(0, 110);
        }
        canvas->restore();

        this->drawGiantCircle(canvas);  
    }

SkBitmap
skiaCreateSampleImage(caskbench_context_t *ctx)
{
    int i, x, y;
    SkBitmap bitmap;
    bitmap.setConfig(SkBitmap::kARGB_8888_Config, 160, 40);
    SkImageInfo info = SkImageInfo::Make(160, 40,
                                         kBGRA_8888_SkColorType,
                                         kPremul_SkAlphaType);
    bitmap.allocPixels(info);
    SkBitmapDevice device(bitmap);
    SkCanvas canvas(&device);
    SkPaint paint;
    SkRect r;

    canvas.clear(0);

    x = 5;
    for (i=0; i<16; i++) {
        paint.setARGB(255, 255/(i+1), 255, 16*i);
        x += 10;
        y = (i%2)*10;
        r.set(x, y, x+10, y+10);

        canvas.drawRect(r, paint);
    }
    canvas.flush();
    return bitmap;
}

void render() {
#if USE_SKIA_OPENGL
    bbutil_clear();
#endif


/************************** BEGIN USER RENDER CODE ***************************/
    // Clear the entire canvas to a solid colour
    SkPaint clearColor;
    clearColor.setARGB(255,0xdd,0xdd,0xdd);
    SkRect fullScreen;
    fullScreen.set(0,0,width,height);
    canvas->drawRect(fullScreen, clearColor);

    // Draw the current demo
    if (demos[currentIndex])
        demos[currentIndex]->onDraw();
/**************************** END USER RENDER CODE ***************************/


    // Draw the contents of the canvas to the screen
#if USE_SKIA_OPENGL
    device->flush();
    bbutil_swap(0);
#else
    bbutil_swap(currentSurface);
    currentSurface = 1 - currentSurface;
    canvas->setBitmapDevice(drawingSurface[currentSurface]);
#endif
}

    virtual void onDrawContent(SkCanvas* canvas) {
        const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        SkPaint paint;
        SkScalar    x = SkIntToScalar(10);
        SkScalar    y = SkIntToScalar(20);

        paint.setFlags(0x105);

        paint.setARGB(fByte, 0xFF, 0xFF, 0xFF);

        paint.setMaskFilter(SkBlurMaskFilter::Create(SkIntToScalar(3),
                                        SkBlurMaskFilter::kNormal_BlurStyle));
        paint.getMaskFilter()->unref();

        SkRandom rand;

        for (int ps = 6; ps <= 35; ps++) {
            paint.setColor(rand.nextU() | (0xFF << 24));
            paint.setTextSize(SkIntToScalar(ps));
            paint.setTextSize(SkIntToScalar(24));
            canvas->drawText(str, strlen(str), x, y, paint);
            y += paint.getFontMetrics(NULL);
        }
        if (false) { // avoid bit rot, suppress warning
            check_for_nonwhite(canvas->getDevice()->accessBitmap(false), fByte);
            SkDebugf("------ byte %x\n", fByte);
        }

        if (false) {
            fByte += 1;
            fByte &= 0xFF;
            this->inval(NULL);
        }
    }

void LayerAndroid::onDraw(SkCanvas* canvas, SkScalar opacity) {
    if (m_haveClip) {
        SkRect r;
        r.set(0, 0, getSize().width(), getSize().height());
        canvas->clipRect(r);
    }

    if (!prepareContext())
        return;

    // we just have this save/restore for opacity...
    SkAutoCanvasRestore restore(canvas, true);

    int canvasOpacity = SkScalarRound(opacity * 255);
    if (canvasOpacity < 255)
        canvas->setDrawFilter(new OpacityDrawFilter(canvasOpacity));

    canvas->drawPicture(*m_recordingPicture);
#if ENABLE(WEBGL)
    if (m_context.get()) {
        m_context->paint(canvas);
    }
#endif
    if (m_extra)
        m_extra->draw(canvas, this);

#ifdef LAYER_DEBUG
    float w = getSize().width();
    float h = getSize().height();
    SkPaint paint;
    paint.setARGB(128, 255, 0, 0);
    canvas->drawLine(0, 0, w, h, paint);
    canvas->drawLine(0, h, w, 0, paint);
    paint.setARGB(128, 0, 255, 0);
    canvas->drawLine(0, 0, 0, h, paint);
    canvas->drawLine(0, h, w, h, paint);
    canvas->drawLine(w, h, w, 0, paint);
    canvas->drawLine(w, 0, 0, 0, paint);

    if (m_isFixed) {
      SkRect layerRect = computeLayerRect(this);
      SkPaint paint;
      paint.setARGB(128, 0, 0, 255);
      canvas->drawRect(layerRect, paint);
    }
#endif
}

void FixedPositioning::contentDraw(SkCanvas* canvas, Layer::PaintStyle style)
{
    if (TilesManager::instance()->getShowVisualIndicator()) {
        SkPaint paint;
        paint.setARGB(80, 255, 0, 0);
        canvas->drawRect(m_fixedRect, paint);
    }
}

static void draw_scene(SkCanvas* canvas, const SkHighContrastConfig& config) {
    SkRect bounds = SkRect::MakeLTRB(0.0f, 0.0f, 1.0f, 1.0f);
    SkPaint xferPaint;
    xferPaint.setColorFilter(SkHighContrastFilter::Make(config));
    canvas->saveLayer(&bounds, &xferPaint);

    SkPaint paint;
    bounds = SkRect::MakeLTRB(0.1f, 0.2f, 0.9f, 0.4f);
    paint.setARGB(0xff, 0x66, 0x11, 0x11);
    canvas->drawRect(bounds, paint);

    SkFont font;
    font.setSize(0.15f);
    font.setEdging(SkFont::Edging::kAlias);

    paint.setARGB(0xff, 0xbb, 0x77, 0x77);
    canvas->drawString("A", 0.15f, 0.35f, font, paint);

    bounds = SkRect::MakeLTRB(0.1f, 0.8f, 0.9f, 1.0f);
    paint.setARGB(0xff, 0xcc, 0xcc, 0xff);
    canvas->drawRect(bounds, paint);

    paint.setARGB(0xff, 0x88, 0x88, 0xbb);
    canvas->drawString("Z", 0.75f, 0.95f, font, paint);

    bounds = SkRect::MakeLTRB(0.1f, 0.4f, 0.9f, 0.6f);
    SkPoint     pts[] = { { 0, 0 }, { 1, 0 } };
    SkColor     colors[] = { SK_ColorWHITE, SK_ColorBLACK };
    SkScalar    pos[] = { 0.2f, 0.8f };
    paint.setShader(SkGradientShader::MakeLinear(
        pts, colors, pos,
        SK_ARRAY_COUNT(colors), SkTileMode::kClamp));
    canvas->drawRect(bounds, paint);

    bounds = SkRect::MakeLTRB(0.1f, 0.6f, 0.9f, 0.8f);
    SkColor colors2[] = { SK_ColorGREEN, SK_ColorWHITE };
    paint.setShader(SkGradientShader::MakeLinear(
        pts, colors2, pos,
        SK_ARRAY_COUNT(colors2), SkTileMode::kClamp));
    canvas->drawRect(bounds, paint);

    canvas->restore();
}

static void writePng(const SkConic& c, const SkConic ch[2], const char* name) {
    const int scale = 10;
    SkConic conic, chopped[2];
    for (int index = 0; index < 3; ++index) {
        conic.fPts[index].fX = c.fPts[index].fX * scale;
        conic.fPts[index].fY = c.fPts[index].fY * scale;
        for (int chIndex = 0; chIndex < 2; ++chIndex) {
            chopped[chIndex].fPts[index].fX = ch[chIndex].fPts[index].fX * scale;
            chopped[chIndex].fPts[index].fY = ch[chIndex].fPts[index].fY * scale;
        }
    }
    conic.fW = c.fW;
    chopped[0].fW = ch[0].fW;
    chopped[1].fW = ch[1].fW;
    SkBitmap bitmap;
    SkRect bounds;
    conic.computeTightBounds(&bounds);
    bounds.outset(10, 10);
    bitmap.tryAllocPixels(SkImageInfo::MakeN32Premul(
          SkScalarRoundToInt(bounds.width()), SkScalarRoundToInt(bounds.height())));
    SkCanvas canvas(bitmap);
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setStyle(SkPaint::kStroke_Style);
    canvas.translate(-bounds.fLeft, -bounds.fTop);
    canvas.drawColor(SK_ColorWHITE);
    SkPath path;
    path.moveTo(conic.fPts[0]);
    path.conicTo(conic.fPts[1], conic.fPts[2], conic.fW);
    paint.setARGB(0x80, 0xFF, 0, 0);
    canvas.drawPath(path, paint);
    path.reset();
    path.moveTo(chopped[0].fPts[0]);
    path.conicTo(chopped[0].fPts[1], chopped[0].fPts[2], chopped[0].fW);
    path.moveTo(chopped[1].fPts[0]);
    path.conicTo(chopped[1].fPts[1], chopped[1].fPts[2], chopped[1].fW);
    paint.setARGB(0x80, 0, 0, 0xFF);
    canvas.drawPath(path, paint);
    SkString filename("c:\\Users\\caryclark\\Documents\\");
    filename.appendf("%s.png", name);
    SkImageEncoder::EncodeFile(filename.c_str(), bitmap,
            SkImageEncoder::kPNG_Type, 100);
}

static void writeDPng(const SkDConic& dC, const char* name) {
    const int scale = 5;
    SkDConic dConic = {{{ {dC.fPts[0].fX * scale, dC.fPts[0].fY * scale },
        {dC.fPts[1].fX * scale, dC.fPts[1].fY * scale },
        {dC.fPts[2].fX * scale, dC.fPts[2].fY * scale }}}, dC.fWeight };
    SkBitmap bitmap;
    SkDRect bounds;
    bounds.setBounds(dConic);
    bounds.fLeft -= 10;
    bounds.fTop -= 10;
    bounds.fRight += 10;
    bounds.fBottom += 10;
    bitmap.tryAllocPixels(SkImageInfo::MakeN32Premul(
          SkScalarRoundToInt(SkDoubleToScalar(bounds.width())),
          SkScalarRoundToInt(SkDoubleToScalar(bounds.height()))));
    SkCanvas canvas(bitmap);
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setStyle(SkPaint::kStroke_Style);
    canvas.translate(SkDoubleToScalar(-bounds.fLeft), SkDoubleToScalar(-bounds.fTop));
    canvas.drawColor(SK_ColorWHITE);
    SkPath path;
    path.moveTo(dConic.fPts[0].asSkPoint());
    path.conicTo(dConic.fPts[1].asSkPoint(), dConic.fPts[2].asSkPoint(), dConic.fWeight);
    paint.setARGB(0x80, 0xFF, 0, 0);
    canvas.drawPath(path, paint);
    path.reset();
    const int chops = 2;
    for (int tIndex = 0; tIndex < chops; ++tIndex) {
        SkDConic chopped = dConic.subDivide(tIndex / (double) chops,
                (tIndex + 1) / (double) chops);
        path.moveTo(chopped.fPts[0].asSkPoint());
        path.conicTo(chopped.fPts[1].asSkPoint(), chopped.fPts[2].asSkPoint(), chopped.fWeight);
    }
    paint.setARGB(0x80, 0, 0, 0xFF);
    canvas.drawPath(path, paint);
    SkString filename("c:\\Users\\caryclark\\Documents\\");
    filename.appendf("%s.png", name);
    SkImageEncoder::EncodeFile(filename.c_str(), bitmap,
            SkImageEncoder::kPNG_Type, 100);
}

 void onDraw(SkCanvas* canvas) override {
     canvas->save();
     canvas->scale(1, -1);
     canvas->translate(0, -kHeight);
     for (int p = 0; p < fPaths.count(); ++p) {
         SkPaint paint;
         paint.setARGB(0xff, 0, 0, 0);
         paint.setAntiAlias(true);
         paint.setStyle(SkPaint::kStroke_Style);
         paint.setStrokeWidth(0);
         canvas->drawPath(fPaths[p], paint);
     }
     canvas->restore();
 }

    void onDraw(SkCanvas* canvas) override {
        static const SkAlpha kAlphaValue[] = { 0xFF, 0x40 };
        static const SkScalar kWidths[] = { 0, 0.5f, 1.5f };

        enum {
            kMargin = 5,
        };
        int wrapX = canvas->getDeviceSize().fWidth - kMargin;

        SkScalar maxH = 0;
        canvas->translate(SkIntToScalar(kMargin), SkIntToScalar(kMargin));
        canvas->save();

        SkScalar x = SkIntToScalar(kMargin);
        for (int p = 0; p < fPaths.count(); ++p) {
            for (size_t a = 0; a < SK_ARRAY_COUNT(kAlphaValue); ++a) {
                for (int aa = 0; aa < 2; ++aa) {
                    for (size_t w = 0; w < SK_ARRAY_COUNT(kWidths); w++) {
                        const SkRect& bounds = fPaths[p].getBounds();

                        if (x + bounds.width() > wrapX) {
                            canvas->restore();
                            canvas->translate(0, maxH + SkIntToScalar(kMargin));
                            canvas->save();
                            maxH = 0;
                            x = SkIntToScalar(kMargin);
                        }

                        SkPaint paint;
                        paint.setARGB(kAlphaValue[a], 0, 0, 0);
                        paint.setAntiAlias(SkToBool(aa));
                        paint.setStyle(SkPaint::kStroke_Style);
                        paint.setStrokeWidth(kWidths[w]);

                        canvas->save();
                        canvas->translate(-bounds.fLeft, -bounds.fTop);
                        canvas->drawPath(fPaths[p], paint);
                        canvas->restore();

                        maxH = SkMaxScalar(maxH, bounds.height());

                        SkScalar dx = bounds.width() + SkIntToScalar(kMargin);
                        x += dx;
                        canvas->translate(dx, 0);
                    }
                }
            }
        }
        canvas->restore();
    }

    void onDrawContent(SkCanvas* canvas) override {
        SkPaint paint;

        canvas->translate(0, 50);

        paint.setColor(SK_ColorBLUE);
        paint.setPathEffect(make_pe(2, fPhase));
        canvas->drawPath(fPath, paint);

        canvas->translate(0, 50);

        paint.setARGB(0xFF, 0, 0xBB, 0);
        paint.setPathEffect(make_pe(3, fPhase));
        canvas->drawPath(fPath, paint);

        canvas->translate(0, 50);

        paint.setARGB(0xFF, 0, 0, 0);
        paint.setPathEffect(make_warp_pe(fPhase));
        TestRastBuilder testRastBuilder;
        paint.setRasterizer(testRastBuilder.detach());
        canvas->drawPath(fPath, paint);
    }