C++ SkSize::set方法代码示例

	OvalTestView() {
        fSize.set(SK_Scalar1, SK_Scalar1);

        fBitmap.setConfig(SkBitmap::kARGB_8888_Config, kILimit, kILimit);
        fBitmap.allocPixels();

        fInsideColor = SkPreMultiplyColor(SK_ColorRED);
        fOutsideColor = SkPreMultiplyColor(SK_ColorGREEN);
    }

    FilterQualityView() : fImage(make_image()), fTrans(2, 2), fShowFatBits(true) {
        fCell.set(256, 256);

        fScale.set(1, SK_Scalar1 / 8, 1);
        fAngle.setMod(0, 360);

        SkScalar values[2];
        fTrans.setMirror(true);
        fTrans.setReset(true);

        fCurrTime = 0;

        fTrans.setRepeatCount(999);
        values[0] = values[1] = 0;
        fTrans.setKeyFrame(0, fCurrTime, values);
        values[0] = values[1] = 1;
        fTrans.setKeyFrame(1, fCurrTime + 2000, values);
    }

    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);
    }

SkShader* SkPictureShader::refBitmapShader(const SkMatrix& matrix, const SkMatrix* localM) const {
    SkASSERT(fPicture && !fPicture->cullRect().isEmpty());

    SkMatrix m;
    m.setConcat(matrix, this->getLocalMatrix());
    if (localM) {
        m.preConcat(*localM);
    }

    // Use a rotation-invariant scale
    SkPoint scale;
    if (!SkDecomposeUpper2x2(m, NULL, &scale, NULL)) {
        // Decomposition failed, use an approximation.
        scale.set(SkScalarSqrt(m.getScaleX() * m.getScaleX() + m.getSkewX() * m.getSkewX()),
                  SkScalarSqrt(m.getScaleY() * m.getScaleY() + m.getSkewY() * m.getSkewY()));
    }
    SkSize scaledSize = SkSize::Make(scale.x() * fTile.width(), scale.y() * fTile.height());

    // Clamp the tile size to about 16M pixels
    static const SkScalar kMaxTileArea = 4096 * 4096;
    SkScalar tileArea = SkScalarMul(scaledSize.width(), scaledSize.height());
    if (tileArea > kMaxTileArea) {
        SkScalar clampScale = SkScalarSqrt(SkScalarDiv(kMaxTileArea, tileArea));
        scaledSize.set(SkScalarMul(scaledSize.width(), clampScale),
                       SkScalarMul(scaledSize.height(), clampScale));
    }

    SkISize tileSize = scaledSize.toRound();
    if (tileSize.isEmpty()) {
        return NULL;
    }

    // The actual scale, compensating for rounding & clamping.
    SkSize tileScale = SkSize::Make(SkIntToScalar(tileSize.width()) / fTile.width(),
                                    SkIntToScalar(tileSize.height()) / fTile.height());

    SkAutoMutexAcquire ama(fCachedBitmapShaderMutex);

    if (!fCachedBitmapShader || tileScale != fCachedTileScale) {
        SkBitmap bm;
        if (!bm.tryAllocN32Pixels(tileSize.width(), tileSize.height())) {
            return NULL;
        }
        bm.eraseColor(SK_ColorTRANSPARENT);

        SkCanvas canvas(bm);
        canvas.scale(tileScale.width(), tileScale.height());
        canvas.translate(fTile.x(), fTile.y());
        canvas.drawPicture(fPicture);

        fCachedTileScale = tileScale;

        SkMatrix shaderMatrix = this->getLocalMatrix();
        shaderMatrix.preScale(1 / tileScale.width(), 1 / tileScale.height());
        fCachedBitmapShader.reset(CreateBitmapShader(bm, fTmx, fTmy, &shaderMatrix));
    }

    // Increment the ref counter inside the mutex to ensure the returned pointer is still valid.
    // Otherwise, the pointer may have been overwritten on a different thread before the object's
    // ref count was incremented.
    fCachedBitmapShader.get()->ref();
    return fCachedBitmapShader;
}

 ImageGM() {
     fBufferSize = RB * H;
     fBuffer = sk_malloc_throw(fBufferSize);
     fSize.set(SkIntToScalar(W), SkIntToScalar(H));
 }