C++ SkMatrix::setScale方法代码示例

    void makeMatrices() {
        {
            SkMatrix m;
            m.setScale(SkIntToScalar(2), SkIntToScalar(3));
            fMatrices.push_back(m);
        }

        {
            SkMatrix m;
            m.setScale(SkIntToScalar(2), SkIntToScalar(2));
            fMatrices.push_back(m);
        }

        {
            SkMatrix m;
            m.setSkew(SkIntToScalar(2), SkIntToScalar(3));
            fMatrices.push_back(m);
        }

        {
            SkMatrix m;
            m.setSkew(SkIntToScalar(2), SkIntToScalar(2));
            fMatrices.push_back(m);
        }

        {
            SkMatrix m;
            m.setRotate(SkIntToScalar(30));
            fMatrices.push_back(m);
        }
    }

static void test_treatAsSprite(skiatest::Reporter* reporter) {
    const unsigned bilerBits = kSkSubPixelBitsForBilerp;

    SkMatrix mat;
    SkISize  size;
    SkRandom rand;

    // assert: translate-only no-filter can always be treated as sprite
    for (int i = 0; i < 1000; ++i) {
        rand_matrix(&mat, rand, SkMatrix::kTranslate_Mask);
        for (int j = 0; j < 1000; ++j) {
            rand_size(&size, rand);
            REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, 0));
        }
    }

    // assert: rotate/perspect is never treated as sprite
    for (int i = 0; i < 1000; ++i) {
        rand_matrix(&mat, rand, SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask);
        for (int j = 0; j < 1000; ++j) {
            rand_size(&size, rand);
            REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, 0));
            REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
        }
    }

    size.set(500, 600);

    const SkScalar tooMuchSubpixel = 100.1f;
    mat.setTranslate(tooMuchSubpixel, 0);
    REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
    mat.setTranslate(0, tooMuchSubpixel);
    REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

    const SkScalar tinySubPixel = 100.02f;
    mat.setTranslate(tinySubPixel, 0);
    REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));
    mat.setTranslate(0, tinySubPixel);
    REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));

    const SkScalar twoThirds = SK_Scalar1 * 2 / 3;
    const SkScalar bigScale = (size.width() + twoThirds) / size.width();
    mat.setScale(bigScale, bigScale);
    REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, false));
    REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

    const SkScalar oneThird = SK_Scalar1 / 3;
    const SkScalar smallScale = (size.width() + oneThird) / size.width();
    mat.setScale(smallScale, smallScale);
    REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, false));
    REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

    const SkScalar oneFortyth = SK_Scalar1 / 40;
    const SkScalar tinyScale = (size.width() + oneFortyth) / size.width();
    mat.setScale(tinyScale, tinyScale);
    REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, false));
    REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));
}

static void textonpath_slide(SkCanvas* canvas) {
    const char* text = "Displacement";
    size_t len =strlen(text);
    SkPath path;
    path.moveTo(100, 300);
    path.quadTo(300, 100, 500, 300);
    path.offset(0, -100);

    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setTextSize(40);

    paint.setStyle(SkPaint::kStroke_Style);
    canvas->drawPath(path, paint);
    paint.setStyle(SkPaint::kFill_Style);

    SkScalar x = 50;
    paint.setColor(0xFF008800);
    canvas->drawTextOnPathHV(text, len, path,
                             x, paint.getTextSize()*2/3, paint);
    paint.setColor(SK_ColorRED);
    canvas->drawTextOnPathHV(text, len, path,
                             x + 60, 0, paint);
    paint.setColor(SK_ColorBLUE);
    canvas->drawTextOnPathHV(text, len, path,
                             x + 120, -paint.getTextSize()*2/3, paint);

    path.offset(0, 200);
    paint.setTextAlign(SkPaint::kRight_Align);

    text = "Matrices";
    len = strlen(text);
    SkScalar pathLen = getpathlen(path);
    SkMatrix matrix;

    paint.setColor(SK_ColorBLACK);
    paint.setStyle(SkPaint::kStroke_Style);
    canvas->drawPath(path, paint);
    paint.setStyle(SkPaint::kFill_Style);

    paint.setTextSize(50);
    canvas->drawTextOnPath(text, len, path, NULL, paint);

    paint.setColor(SK_ColorRED);
    matrix.setScale(-SK_Scalar1, SK_Scalar1);
    matrix.postTranslate(pathLen, 0);
    canvas->drawTextOnPath(text, len, path, &matrix, paint);

    paint.setColor(SK_ColorBLUE);
    matrix.setScale(SK_Scalar1, -SK_Scalar1);
    canvas->drawTextOnPath(text, len, path, &matrix, paint);

    paint.setColor(0xFF008800);
    matrix.setScale(-SK_Scalar1, -SK_Scalar1);
    matrix.postTranslate(pathLen, 0);
    canvas->drawTextOnPath(text, len, path, &matrix, paint);
}

   void setWHZ(int width, int height, int zoom) {
        fZoom = zoom;
        fBounds.set(0, 0, SkIntToScalar(width * zoom), SkIntToScalar(height * zoom));
        fMatrix.setScale(SkIntToScalar(zoom), SkIntToScalar(zoom));
        fInverse.setScale(SK_Scalar1 / zoom, SK_Scalar1 / zoom);
        fShader.reset(sk_tool_utils::create_checkerboard_shader(
                              0xFFCCCCCC, 0xFFFFFFFF, zoom));

        SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
        fMinSurface.reset(SkSurface::NewRaster(info));
        info = info.makeWH(width * zoom, height * zoom);
        fMaxSurface.reset(SkSurface::NewRaster(info));
    }

static void test_decompScale(skiatest::Reporter* reporter) {
    SkMatrix m;

    m.reset();
    REPORTER_ASSERT(reporter, check_decompScale(m));
    m.setScale(2, 3);
    REPORTER_ASSERT(reporter, check_decompScale(m));
    m.setRotate(35, 0, 0);
    REPORTER_ASSERT(reporter, check_decompScale(m));

    m.setScale(1, 0);
    REPORTER_ASSERT(reporter, !check_decompScale(m));
}

    void makeMatrices() {
        {
        SkMatrix m;
        m.setIdentity();
        fMatrices.push_back(m);
        }

        {
        SkMatrix m;
        m.setScale(SkIntToScalar(3), SkIntToScalar(2));
        fMatrices.push_back(m);
        }

        {
        SkMatrix m;
        m.setScale(SkIntToScalar(2), SkIntToScalar(2));
        fMatrices.push_back(m);
        }

        {
        SkMatrix m;
        m.setScale(SkIntToScalar(1), SkIntToScalar(2));
        fMatrices.push_back(m);
        }

        {
        SkMatrix m;
        m.setScale(SkIntToScalar(4), SkIntToScalar(1));
        fMatrices.push_back(m);
        }

        {
        SkMatrix m;
        m.setRotate(SkIntToScalar(90));
        fMatrices.push_back(m);
        }

        {
        SkMatrix m;
        m.setSkew(SkIntToScalar(2), SkIntToScalar(3));
        fMatrices.push_back(m);
        }

        {
        SkMatrix m;
        m.setRotate(SkIntToScalar(60));
        fMatrices.push_back(m);
        }
    }

void SkPDFDevice::internalDrawBitmap(const SkMatrix& matrix,
                                     const SkBitmap& bitmap,
                                     const SkIRect* srcRect,
                                     const SkPaint& paint) {
    SkIRect subset = SkIRect::MakeWH(bitmap.width(), bitmap.height());
    if (srcRect && !subset.intersect(*srcRect))
        return;

    SkPDFImage* image = SkPDFImage::CreateImage(bitmap, subset, paint);
    if (!image)
        return;

    SkMatrix scaled;
    // Adjust for origin flip.
    scaled.setScale(1, -1);
    scaled.postTranslate(0, 1);
    // Scale the image up from 1x1 to WxH.
    scaled.postScale(SkIntToScalar(subset.width()),
                     SkIntToScalar(subset.height()));
    scaled.postConcat(matrix);
    SkMatrix curTransform = setTransform(scaled);
    updateGSFromPaint(paint, false);

    fXObjectResources.push(image);  // Transfer reference.
    fContent.writeText("/X");
    fContent.writeDecAsText(fXObjectResources.count() - 1);
    fContent.writeText(" Do\n");
    setTransform(curTransform);
}

DEF_TEST(RecordDraw_SetMatrixClobber, r) {
    // Set up an SkRecord that just scales by 2x,3x.
    SkRecord scaleRecord;
    SkRecorder scaleCanvas(&scaleRecord, W, H);
    SkMatrix scale;
    scale.setScale(2, 3);
    scaleCanvas.setMatrix(scale);

    // Set up an SkRecord with an initial +20, +20 translate.
    SkRecord translateRecord;
    SkRecorder translateCanvas(&translateRecord, W, H);
    SkMatrix translate;
    translate.setTranslate(20, 20);
    translateCanvas.setMatrix(translate);

    SkRecordDraw(scaleRecord, &translateCanvas, nullptr, nullptr, 0, nullptr/*bbh*/, nullptr/*callback*/);
    REPORTER_ASSERT(r, 4 == translateRecord.count());
    assert_type<SkRecords::SetMatrix>(r, translateRecord, 0);
    assert_type<SkRecords::Save>     (r, translateRecord, 1);
    assert_type<SkRecords::SetMatrix>(r, translateRecord, 2);
    assert_type<SkRecords::Restore>  (r, translateRecord, 3);

    // When we look at translateRecord now, it should have its first +20,+20 translate,
    // then a 2x,3x scale that's been concatted with that +20,+20 translate.
    const SkRecords::SetMatrix* setMatrix;
    setMatrix = assert_type<SkRecords::SetMatrix>(r, translateRecord, 0);
    REPORTER_ASSERT(r, setMatrix->matrix == translate);

    setMatrix = assert_type<SkRecords::SetMatrix>(r, translateRecord, 2);
    SkMatrix expected = scale;
    expected.postConcat(translate);
    REPORTER_ASSERT(r, setMatrix->matrix == expected);
}

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

        SkMatrix matrix;

        SkGroupShape* gs = new SkGroupShape;
        SkAutoUnref aur(gs);
        gs->appendShape(&fGroup);
        matrix.setScale(-SK_Scalar1, SK_Scalar1);
        matrix.postTranslate(SkIntToScalar(220), SkIntToScalar(240));
        gs->appendShape(&fGroup, matrix);
        matrix.setTranslate(SkIntToScalar(240), 0);
        matrix.preScale(SK_Scalar1*2, SK_Scalar1*2);
        gs->appendShape(&fGroup, matrix);

#if 1
        SkPicture* pict = new SkPicture;
        SkCanvas* cv = pict->beginRecording(1000, 1000);
        cv->scale(SK_ScalarHalf, SK_ScalarHalf);
        gs->draw(cv);
        cv->translate(SkIntToScalar(680), SkIntToScalar(480));
        cv->scale(-SK_Scalar1, SK_Scalar1);
        gs->draw(cv);
        pict->endRecording();
        canvas->drawPicture(*pict);
        pict->unref();
#endif
}

static void r7(SkLayerRasterizer* rast, SkPaint& p) {
    SkMatrix    lattice;
    lattice.setScale(SK_Scalar1*6, SK_Scalar1*6, 0, 0);
    lattice.postSkew(SK_Scalar1/3, 0, 0, 0);
    p.setPathEffect(new Dot2DPathEffect(SK_Scalar1*4, lattice))->unref();
    rast->addLayer(p);
}

static SkPathEffect* makepe(float interp, SkTDArray<SkPoint>* pts) {
    SkMatrix    lattice;
    SkScalar    rad = 3 + SkIntToScalar(4) * (1 - interp);
    lattice.setScale(rad*2, rad*2, 0, 0);
    lattice.postSkew(SK_Scalar1/3, 0, 0, 0);
    return new Dot2DPathEffect(rad, lattice, pts);
}

    virtual void onDraw(SkCanvas* canvas) {
        this->drawBG(canvas);
        
        SkMatrix saveM = *fMatrixRefs[3];
        SkScalar c = SkIntToScalar(50);
        fMatrixRefs[3]->preRotate(SkIntToScalar(30), c, c);
        
        SkMatrix matrix;
     
        SkGroupShape* gs = new SkGroupShape;
        SkAutoUnref aur(gs);
        gs->appendShape(&fGroup);
        matrix.setScale(-SK_Scalar1, SK_Scalar1);
        matrix.postTranslate(SkIntToScalar(220), SkIntToScalar(240));
        gs->appendShape(&fGroup, matrix);
        matrix.setTranslate(SkIntToScalar(240), 0);
        matrix.preScale(SK_Scalar1*2, SK_Scalar1*2);
        gs->appendShape(&fGroup, matrix);
        
#if 0        
        canvas->drawShape(gs);
#else
        SkPicture pict;
        SkCanvas* cv = pict.beginRecording(1000, 1000);
        cv->scale(SK_ScalarHalf, SK_ScalarHalf);
        cv->drawShape(gs);
        cv->translate(SkIntToScalar(680), SkIntToScalar(480));
        cv->scale(-SK_Scalar1, SK_Scalar1);
        cv->drawShape(gs);
        pict.endRecording();
        canvas->drawPicture(pict);
#endif

        *fMatrixRefs[3] = saveM;
}

static void make_strip(Rec* rec, int texWidth, int texHeight) {
    const SkScalar tx = SkIntToScalar(texWidth);
    const SkScalar ty = SkIntToScalar(texHeight);
    const int n = 24;

    rec->fMode = SkCanvas::kTriangleStrip_VertexMode;
    rec->fCount = 2 * (n + 1);
    rec->fVerts = new SkPoint[rec->fCount];
    rec->fTexs  = new SkPoint[rec->fCount];

    SkPoint* v = rec->fVerts;
    SkPoint* t = rec->fTexs;

    for (int i = 0; i < n; i++) {
        SkScalar cos;
        SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos);
        v[i*2 + 0].set(cos/2, sin/2);
        v[i*2 + 1].set(cos, sin);

        t[i*2 + 0].set(tx * i / n, ty);
        t[i*2 + 1].set(tx * i / n, 0);
    }
    v[2*n + 0] = v[0];
    v[2*n + 1] = v[1];

    t[2*n + 0].set(tx, ty);
    t[2*n + 1].set(tx, 0);

    SkMatrix m;
    m.setScale(SkIntToScalar(100), SkIntToScalar(100));
    m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
    m.mapPoints(v, rec->fCount);
}

// Set a bitmap shader that mimics dashing by width-on, width-off.
// Returns false if it could not succeed (e.g. there was an existing shader)
static bool setBitmapDash(SkPaint* paint, int width) {
    if (width <= 0 || paint->getShader())
        return false;

    SkColor c = paint->getColor();

    SkBitmap bm;
    bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 1);
    bm.allocPixels();
    bm.lockPixels();

    // set the ON pixel
    *bm.getAddr32(0, 0) = SkPreMultiplyARGB(0xFF, SkColorGetR(c),
                                            SkColorGetG(c), SkColorGetB(c));
    // set the OFF pixel
    *bm.getAddr32(1, 0) = 0;
    bm.unlockPixels();

    SkMatrix matrix;
    matrix.setScale(SkIntToScalar(width), SK_Scalar1);

    SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
                                               SkShader::kClamp_TileMode);
    s->setLocalMatrix(matrix);

    paint->setShader(s)->unref();
    return true;
}

 void draw(SkCanvas* canvas,
           const SkRect& rect,
           const SkSize& deviceSize,
           SkPaint::FilterLevel filterLevel,
           SkImageFilter* input = NULL) {
     SkRect dstRect;
     canvas->getTotalMatrix().mapRect(&dstRect, rect);
     canvas->save();
     SkScalar deviceScaleX = SkScalarDiv(deviceSize.width(), dstRect.width());
     SkScalar deviceScaleY = SkScalarDiv(deviceSize.height(), dstRect.height());
     canvas->translate(rect.x(), rect.y());
     canvas->scale(deviceScaleX, deviceScaleY);
     canvas->translate(-rect.x(), -rect.y());
     SkMatrix matrix;
     matrix.setScale(SkScalarInvert(deviceScaleX),
                     SkScalarInvert(deviceScaleY));
     SkAutoTUnref<SkImageFilter> imageFilter(
         SkMatrixImageFilter::Create(matrix, filterLevel, input));
     SkPaint filteredPaint;
     filteredPaint.setImageFilter(imageFilter.get());
     canvas->saveLayer(&rect, &filteredPaint);
     SkPaint paint;
     paint.setColor(0xFF00FF00);
     SkRect ovalRect = rect;
     ovalRect.inset(SkIntToScalar(4), SkIntToScalar(4));
     canvas->drawOval(ovalRect, paint);
     canvas->restore(); // for saveLayer
     canvas->restore();
 }