C++ SkMatrix::mapPoints方法代码示例

void FatBits::drawTriangle(SkCanvas* canvas, SkPoint pts[3]) {
    SkPaint paint;

    fInverse.mapPoints(pts, 3);

    if (fGrid) {
        apply_grid(pts, 3);
    }

    SkPath path;
    path.moveTo(pts[0]);
    path.lineTo(pts[1]);
    path.lineTo(pts[2]);
    path.close();

    erase(fMinSurface);
    this->setupPaint(&paint);
    paint.setColor(FAT_PIXEL_COLOR);
    fMinSurface->getCanvas()->drawPath(path, paint);
    this->copyMinToMax();

    SkCanvas* max = fMaxSurface->getCanvas();

    fMatrix.mapPoints(pts, 3);
    this->drawTriangleSkeleton(max, pts);

    fMaxSurface->draw(canvas, 0, 0, NULL);
}

void FatBits::drawLine(SkCanvas* canvas, SkPoint pts[]) {
    SkPaint paint;

    fInverse.mapPoints(pts, 2);

    if (fGrid) {
        apply_grid(pts, 2);
    }

    erase(fMinSurface);
    this->setupPaint(&paint);
    paint.setColor(FAT_PIXEL_COLOR);
    if (fUseClip) {
        fMinSurface->getCanvas()->save();
        SkRect r = fClipRect;
        r.inset(SK_Scalar1/3, SK_Scalar1/3);
        fMinSurface->getCanvas()->clipRect(r, SkRegion::kIntersect_Op, true);
    }
    fMinSurface->getCanvas()->drawLine(pts[0].fX, pts[0].fY, pts[1].fX, pts[1].fY, paint);
    if (fUseClip) {
        fMinSurface->getCanvas()->restore();
    }
    this->copyMinToMax();

    SkCanvas* max = fMaxSurface->getCanvas();

    fMatrix.mapPoints(pts, 2);
    this->drawLineSkeleton(max, pts);

    fMaxSurface->draw(canvas, 0, 0, NULL);
}

void FatBits::drawRect(SkCanvas* canvas, SkPoint pts[2]) {
    SkPaint paint;

    fInverse.mapPoints(pts, 2);

    if (fGrid) {
        apply_grid(pts, 2);
    }

    SkRect r;
    r.set(pts, 2);

    erase(fMinSurface);
    this->setupPaint(&paint);
    paint.setColor(FAT_PIXEL_COLOR);
    {
        SkCanvas* c = fMinSurface->getCanvas();
        fRectAsOval ? c->drawOval(r, paint) : c->drawRect(r, paint);
    }
    this->copyMinToMax();

    SkCanvas* max = fMaxSurface->getCanvas();

    fMatrix.mapPoints(pts, 2);
    r.set(pts, 2);
    this->drawRectSkeleton(max, r);

    fMaxSurface->draw(canvas, 0, 0, NULL);
}

    virtual void onDraw(SkCanvas* canvas) {
        SkMatrix m;
        m.reset();
        m.setRotate(33 * SK_Scalar1);
        m.postScale(3000 * SK_Scalar1, 3000 * SK_Scalar1);
        m.postTranslate(6000 * SK_Scalar1, -5000 * SK_Scalar1);
        canvas->concat(m);

        SkPaint paint;
        paint.setColor(SK_ColorRED);
        paint.setAntiAlias(true);

        bool success = m.invert(&m);
        SkASSERT(success);
        (void) success; // silence compiler :(

        SkPath path;

        SkPoint pt = {10 * SK_Scalar1, 10 * SK_Scalar1};
        SkScalar small = 1 / (500 * SK_Scalar1);

        m.mapPoints(&pt, 1);
        path.addCircle(pt.fX, pt.fY, small);
        canvas->drawPath(path, paint);

        pt.set(30 * SK_Scalar1, 10 * SK_Scalar1);
        m.mapPoints(&pt, 1);
        SkRect rect = {pt.fX - small, pt.fY - small,
                       pt.fX + small, pt.fY + small};
        canvas->drawRect(rect, paint);

        SkBitmap bmp;
        bmp.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
        bmp.allocPixels();
        bmp.lockPixels();
        uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels());
        pixels[0] = SkPackARGB32(0xFF, 0xFF, 0x00, 0x00);
        pixels[1] = SkPackARGB32(0xFF, 0x00, 0xFF, 0x00);
        pixels[2] = SkPackARGB32(0x80, 0x00, 0x00, 0x00);
        pixels[3] = SkPackARGB32(0xFF, 0x00, 0x00, 0xFF);
        bmp.unlockPixels();
        pt.set(30 * SK_Scalar1, 30 * SK_Scalar1);
        m.mapPoints(&pt, 1);
        SkShader* shader = SkShader::CreateBitmapShader(
                                            bmp,
                                            SkShader::kRepeat_TileMode,
                                            SkShader::kRepeat_TileMode);
        SkMatrix s;
        s.reset();
        s.setScale(SK_Scalar1 / 1000, SK_Scalar1 / 1000);
        shader->setLocalMatrix(s);
        paint.setShader(shader)->unref();
        paint.setAntiAlias(false);
        paint.setFilterLevel(SkPaint::kLow_FilterLevel);
        rect.setLTRB(pt.fX - small, pt.fY - small,
                     pt.fX + small, pt.fY + small);
        canvas->drawRect(rect, paint);
    }

void Matrix::NativeMapPoints(
    /* [in] */ Int64 matrixHandle,
    /* [out] */ ArrayOf<Float>* dst,
    /* [in] */ Int32 dstIndex,
    /* [in] */ ArrayOf<Float>* src,
    /* [in] */ Int32 srcIndex,
    /* [in] */ Int32 ptCount,
    /* [in] */ Boolean isPts)
{
    SkASSERT(ptCount >= 0);
    SkASSERT(src->GetLength() >= srcIndex + (ptCount << 1));
    SkASSERT(dst->GetLength() >= dstIndex + (ptCount << 1));

    SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
    // AutoJavaFloatArray autoSrc(env, src, srcIndex + (ptCount << 1), kRO_JNIAccess);
    // AutoJavaFloatArray autoDst(env, dst, dstIndex + (ptCount << 1), kRW_JNIAccess);
    Float* srcArray = src->GetPayload() + srcIndex;
    Float* dstArray = dst->GetPayload() + dstIndex;
#ifdef SK_SCALAR_IS_FLOAT
    if (isPts)
        matrix->mapPoints((SkPoint*)dstArray, (const SkPoint*)srcArray,
                          ptCount);
    else
        matrix->mapVectors((SkVector*)dstArray, (const SkVector*)srcArray,
                           ptCount);
#else
    SkASSERT(FALSE);
#endif
}

    GiantDashBench(LineType lt, SkScalar width)  {
        fName.printf("giantdashline_%s_%g", LineTypeName(lt), width);
        fStrokeWidth = width;

        // deliberately pick intervals that won't be caught by asPoints(), so
        // we can test the filterPath code-path.
        const SkScalar intervals[] = { 20, 10, 10, 10 };
        fPathEffect.reset(SkDashPathEffect::Create(intervals,
                                                   SK_ARRAY_COUNT(intervals), 0));

        SkScalar cx = 640 / 2;  // center X
        SkScalar cy = 480 / 2;  // center Y
        SkMatrix matrix;

        switch (lt) {
            case kHori_LineType:
                matrix.setIdentity();
                break;
            case kVert_LineType:
                matrix.setRotate(90, cx, cy);
                break;
            case kDiag_LineType:
                matrix.setRotate(45, cx, cy);
                break;
            case kLineTypeCount:
                // Not a real enum value.
                break;
        }

        const SkScalar overshoot = 100*1000;
        const SkPoint pts[2] = {
            { -overshoot, cy }, { 640 + overshoot, cy }
        };
        matrix.mapPoints(fPts, pts, 2);
    }

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);
}

 virtual bool onClick(Click* click) {
     SkPoint pts[2] = { click->fOrig, click->fCurr };
     fInverse.mapPoints(pts, 2);
     this->warp(pts[0], pts[1]);
     this->inval(NULL);
     return true;
 }

/**
 *  For the purposes of drawing bitmaps, if a matrix is "almost" translate
 *  go ahead and treat it as if it were, so that subsequent code can go fast.
 */
static bool just_trans_clamp(const SkMatrix& matrix, const SkBitmap& bitmap) {
    SkASSERT(matrix_only_scale_translate(matrix));

    if (matrix.getType() & SkMatrix::kScale_Mask) {
        SkRect src, dst;
        bitmap.getBounds(&src);

        // Can't call mapRect(), since that will fix up inverted rectangles,
        // e.g. when scale is negative, and we don't want to return true for
        // those.
        matrix.mapPoints(SkTCast<SkPoint*>(&dst),
                         SkTCast<const SkPoint*>(&src),
                         2);

        // Now round all 4 edges to device space, and then compare the device
        // width/height to the original. Note: we must map all 4 and subtract
        // rather than map the "width" and compare, since we care about the
        // phase (in pixel space) that any translate in the matrix might impart.
        SkIRect idst;
        dst.round(&idst);
        return idst.width() == bitmap.width() && idst.height() == bitmap.height();
    }
    // if we got here, we're either kTranslate_Mask or identity
    return true;
}

bool check_bounds(const SkMatrix& viewMatrix, const SkRect& devBounds, void* vertices, int vCount)
{
    SkRect tolDevBounds = devBounds;
    // The bounds ought to be tight, but in perspective the below code runs the verts
    // through the view matrix to get back to dev coords, which can introduce imprecision.
    if (viewMatrix.hasPerspective()) {
        tolDevBounds.outset(SK_Scalar1 / 1000, SK_Scalar1 / 1000);
    } else {
        // Non-persp matrices cause this path renderer to draw in device space.
        SkASSERT(viewMatrix.isIdentity());
    }
    SkRect actualBounds;

    VertexType* verts = reinterpret_cast<VertexType*>(vertices);
    bool first = true;
    for (int i = 0; i < vCount; ++i) {
        SkPoint pos = verts[i].fPos;
        // This is a hack to workaround the fact that we move some degenerate segments offscreen.
        if (SK_ScalarMax == pos.fX) {
            continue;
        }
        viewMatrix.mapPoints(&pos, 1);
        if (first) {
            actualBounds.set(pos.fX, pos.fY, pos.fX, pos.fY);
            first = false;
        } else {
            actualBounds.growToInclude(pos.fX, pos.fY);
        }
    }
    if (!first) {
        return tolDevBounds.contains(actualBounds);
    }

    return true;
}

void GrStencilAndCoverTextContext::flush() {
    if (fQueuedGlyphCount > 0) {
        SkAutoTUnref<GrPathProcessor> pp(GrPathProcessor::Create(fPaint.getColor(),
                                                                 fViewMatrix,
                                                                 fLocalMatrix));

        // We should only be flushing about once every run.  However, if this impacts performance
        // we could move the creation of the GrPipelineBuilder earlier.
        GrPipelineBuilder pipelineBuilder(fPaint, fRenderTarget, fClip);
        SkASSERT(fRenderTarget->isStencilBufferMultisampled() || !fPaint.isAntiAlias());
        pipelineBuilder.setState(GrPipelineBuilder::kHWAntialias_Flag, fPaint.isAntiAlias());

        GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
                                     kZero_StencilOp,
                                     kZero_StencilOp,
                                     kNotEqual_StencilFunc,
                                     0xffff,
                                     0x0000,
                                     0xffff);

        *pipelineBuilder.stencil() = kStencilPass;

        SkASSERT(0 == fQueuedGlyphCount);
        SkASSERT(kGlyphBufferSize == fFallbackGlyphsIdx);

        fDrawContext->drawPaths(&pipelineBuilder, pp, fGlyphs,
                                fGlyphIndices, GrPathRange::kU16_PathIndexType,
                                get_xy_scalar_array(fGlyphPositions),
                                GrPathRendering::kTranslate_PathTransformType,
                                fQueuedGlyphCount, GrPathRendering::kWinding_FillType);

        fQueuedGlyphCount = 0;
    }

    if (fFallbackGlyphsIdx < kGlyphBufferSize) {
        int fallbackGlyphCount = kGlyphBufferSize - fFallbackGlyphsIdx;

        GrPaint paintFallback(fPaint);

        SkPaint skPaintFallback(fSkPaint);
        if (!fUsingDeviceSpaceGlyphs) {
            fStroke.applyToPaint(&skPaintFallback);
        }
        skPaintFallback.setTextAlign(SkPaint::kLeft_Align); // Align has already been accounted for.
        skPaintFallback.setTextEncoding(SkPaint::kGlyphID_TextEncoding);

        SkMatrix inverse;
        if (this->mapToFallbackContext(&inverse)) {
            inverse.mapPoints(&fGlyphPositions[fFallbackGlyphsIdx], fallbackGlyphCount);
        }

        fFallbackTextContext->drawPosText(fRenderTarget, fClip, paintFallback, skPaintFallback,
                                          fViewMatrix, (char*)&fGlyphIndices[fFallbackGlyphsIdx],
                                          2 * fallbackGlyphCount,
                                          get_xy_scalar_array(&fGlyphPositions[fFallbackGlyphsIdx]),
                                          2, SkPoint::Make(0, 0), fRegionClipBounds);

        fFallbackGlyphsIdx = kGlyphBufferSize;
    }
}

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

        rec->fMode = SkCanvas::kTriangleFan_VertexMode;
        rec->fCount = n + 2;
        rec->fVerts = new SkPoint[rec->fCount];
        rec->fTexs  = new SkPoint[rec->fCount];

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

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

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

SkPoint View::convertToLocal(SkPoint point, View* reference)
{
    SkMatrix m;
    if (currentTransformMatrix(reference).invert(&m)) {
        m.mapPoints(&point, 1);
    }
    return point;
}

 int hittest(SkScalar x, SkScalar y) {
     SkPoint target = { x, y };
     SkPoint pts[2] = { fPts[1], fPts[2] };
     fMatrix.mapPoints(pts, 2);
     for (int i = 0; i < 2; i++) {
         if (SkPoint::Distance(pts[i], target) < SkIntToScalar(4)) {
             return i + 1;
         }
     }
     return -1;
 }

static bool isPointSkiaSafe(const SkMatrix& transform, const SkPoint& pt)
{
#ifdef ENSURE_VALUE_SAFETY_FOR_SKIA
    // Now check for points that will overflow. We check the *transformed*
    // points since this is what will be rasterized.
    SkPoint xPt;
    transform.mapPoints(&xPt, &pt, 1);
    return isCoordinateSkiaSafe(xPt.fX) && isCoordinateSkiaSafe(xPt.fY);
#else
    return true;
#endif
}