C++ SkMatrix::getType方法代码示例

SkMatrix SkPDFDevice::setTransform(const SkMatrix& m) {
    SkMatrix old = fGraphicStack[fGraphicStackIndex].fTransform;
    if (old == m)
        return old;

    if (old.getType() != SkMatrix::kIdentity_Mask) {
        SkASSERT(fGraphicStackIndex > 0);
        SkASSERT(fGraphicStack[fGraphicStackIndex - 1].fTransform.getType() ==
                 SkMatrix::kIdentity_Mask);
        SkASSERT(fGraphicStack[fGraphicStackIndex].fClip ==
                 fGraphicStack[fGraphicStackIndex - 1].fClip);
        popGS();
    }
    if (m.getType() == SkMatrix::kIdentity_Mask)
        return old;

    if (fGraphicStackIndex == 0 || fGraphicStack[fGraphicStackIndex].fClip !=
            fGraphicStack[fGraphicStackIndex - 1].fClip)
        pushGS();

    SkScalar transform[6];
    SkAssertResult(m.pdfTransform(transform));
    for (size_t i = 0; i < SK_ARRAY_COUNT(transform); i++) {
        SkPDFScalar::Append(transform[i], &fContent);
        fContent.writeText(" ");
    }
    fContent.writeText("cm\n");
    fGraphicStack[fGraphicStackIndex].fTransform = m;

    return old;
}

static void test_matrix_recttorect(skiatest::Reporter* reporter) {
    SkRect src, dst;
    SkMatrix matrix;

    src.set(0, 0, SK_Scalar1*10, SK_Scalar1*10);
    dst = src;
    matrix.setRectToRect(src, dst, SkMatrix::kFill_ScaleToFit);
    REPORTER_ASSERT(reporter, SkMatrix::kIdentity_Mask == matrix.getType());
    REPORTER_ASSERT(reporter, matrix.rectStaysRect());

    dst.offset(SK_Scalar1, SK_Scalar1);
    matrix.setRectToRect(src, dst, SkMatrix::kFill_ScaleToFit);
    REPORTER_ASSERT(reporter, SkMatrix::kTranslate_Mask == matrix.getType());
    REPORTER_ASSERT(reporter, matrix.rectStaysRect());

    dst.fRight += SK_Scalar1;
    matrix.setRectToRect(src, dst, SkMatrix::kFill_ScaleToFit);
    REPORTER_ASSERT(reporter,
                    (SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask) == matrix.getType());
    REPORTER_ASSERT(reporter, matrix.rectStaysRect());

    dst = src;
    dst.fRight = src.fRight * 2;
    matrix.setRectToRect(src, dst, SkMatrix::kFill_ScaleToFit);
    REPORTER_ASSERT(reporter, SkMatrix::kScale_Mask == matrix.getType());
    REPORTER_ASSERT(reporter, matrix.rectStaysRect());
}

void SkDeferredCanvas::Rec::setConcat(const SkMatrix& m) {
    SkASSERT(m.getType() <= (SkMatrix::kScale_Mask | SkMatrix::kTranslate_Mask));
    
    if (m.getType() <= SkMatrix::kTranslate_Mask) {
        fType = kTrans_Type;
        fData.fTranslate.set(m.getTranslateX(), m.getTranslateY());
    } else {
        fType = kScaleTrans_Type;
        fData.fScaleTrans.fScale.set(m.getScaleX(), m.getScaleY());
        fData.fScaleTrans.fTrans.set(m.getTranslateX(), m.getTranslateY());
    }
}

/**
 *  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;
}

/**
 *  Determine if the matrix can be treated as integral-only-translate,
 *  for the purpose of filtering.
 */
static bool just_trans_integral(const SkMatrix& m) {
    static constexpr SkScalar tol = SK_Scalar1 / 256;

    return m.getType() <= SkMatrix::kTranslate_Mask
        && SkScalarNearlyEqual(m.getTranslateX(), SkScalarRoundToScalar(m.getTranslateX()), tol)
        && SkScalarNearlyEqual(m.getTranslateY(), SkScalarRoundToScalar(m.getTranslateY()), tol);
}

void Matrix4::load(const SkMatrix& v) {
    memset(data, 0, sizeof(data));

    data[kScaleX]     = v[SkMatrix::kMScaleX];
    data[kSkewX]      = v[SkMatrix::kMSkewX];
    data[kTranslateX] = v[SkMatrix::kMTransX];

    data[kSkewY]      = v[SkMatrix::kMSkewY];
    data[kScaleY]     = v[SkMatrix::kMScaleY];
    data[kTranslateY] = v[SkMatrix::kMTransY];

    data[kPerspective0]  = v[SkMatrix::kMPersp0];
    data[kPerspective1]  = v[SkMatrix::kMPersp1];
    data[kPerspective2]  = v[SkMatrix::kMPersp2];

    data[kScaleZ] = 1.0f;

    // NOTE: The flags are compatible between SkMatrix and this class.
    //       However, SkMatrix::getType() does not return the flag
    //       kRectStaysRect. The return value is masked with 0xF
    //       so we need the extra rectStaysRect() check
    mType = v.getType();
    if (v.rectStaysRect()) {
        mType |= kTypeRectToRect;
    }
}

bool shouldDrawAntiAliased(const GraphicsContext* context, const SkRect& destRect)
{
    if (!context->shouldAntialias())
        return false;
    const SkMatrix totalMatrix = context->getTotalMatrix();
    // Don't disable anti-aliasing if we're rotated or skewed.
    if (!totalMatrix.rectStaysRect())
        return true;
    // Disable anti-aliasing for scales or n*90 degree rotations.
    // Allow to opt out of the optimization though for "hairline" geometry
    // images - using the shouldAntialiasHairlineImages() GraphicsContext flag.
    if (!context->shouldAntialiasHairlineImages())
        return false;
    // Check if the dimensions of the destination are "small" (less than one
    // device pixel). To prevent sudden drop-outs. Since we know that
    // kRectStaysRect_Mask is set, the matrix either has scale and no skew or
    // vice versa. We can query the kAffine_Mask flag to determine which case
    // it is.
    // FIXME: This queries the CTM while drawing, which is generally
    // discouraged. Always drawing with AA can negatively impact performance
    // though - that's why it's not always on.
    SkScalar widthExpansion, heightExpansion;
    if (totalMatrix.getType() & SkMatrix::kAffine_Mask)
        widthExpansion = totalMatrix[SkMatrix::kMSkewY], heightExpansion = totalMatrix[SkMatrix::kMSkewX];
    else
        widthExpansion = totalMatrix[SkMatrix::kMScaleX], heightExpansion = totalMatrix[SkMatrix::kMScaleY];
    return destRect.width() * fabs(widthExpansion) < 1 || destRect.height() * fabs(heightExpansion) < 1;
}

template <typename T> void write_sparse_matrix(T* writer, const SkMatrix& matrix) {
    SkMatrix::TypeMask tm = matrix.getType();
    SkScalar tmp[9];
    if (tm & SkMatrix::kPerspective_Mask) {
        matrix.get9(tmp);
        writer->write(tmp, 9 * sizeof(SkScalar));
    } else if (tm & SkMatrix::kAffine_Mask) {
        tmp[0] = matrix[SkMatrix::kMScaleX];
        tmp[1] = matrix[SkMatrix::kMSkewX];
        tmp[2] = matrix[SkMatrix::kMTransX];
        tmp[3] = matrix[SkMatrix::kMScaleY];
        tmp[4] = matrix[SkMatrix::kMSkewY];
        tmp[5] = matrix[SkMatrix::kMTransY];
        writer->write(tmp, 6 * sizeof(SkScalar));
    } else if (tm & SkMatrix::kScale_Mask) {
        tmp[0] = matrix[SkMatrix::kMScaleX];
        tmp[1] = matrix[SkMatrix::kMTransX];
        tmp[2] = matrix[SkMatrix::kMScaleY];
        tmp[3] = matrix[SkMatrix::kMTransY];
        writer->write(tmp, 4 * sizeof(SkScalar));
    } else if (tm & SkMatrix::kTranslate_Mask) {
        tmp[0] = matrix[SkMatrix::kMTransX];
        tmp[1] = matrix[SkMatrix::kMTransY];
        writer->write(tmp, 2 * sizeof(SkScalar));
    }
    // else write nothing for Identity
}

static inline bool CanApplyDstMatrixAsCTM(const SkMatrix& m, const SkPaint& paint) {
    if (!paint.getMaskFilter()) {
        return true;
    }

    // Some mask filters parameters (sigma) depend on the CTM/scale.
    return m.getType() <= SkMatrix::kTranslate_Mask;
}

void SkPictureRecord::recordScale(const SkMatrix& m) {
    SkASSERT(SkMatrix::kScale_Mask == m.getType());

    // op + sx + sy
    size_t size = 1 * kUInt32Size + 2 * sizeof(SkScalar);
    size_t initialOffset = this->addDraw(SCALE, &size);
    this->addScalar(m.getScaleX());
    this->addScalar(m.getScaleY());
    this->validate(initialOffset, size);
}

void SkPictureRecord::recordTranslate(const SkMatrix& m) {
    SkASSERT(SkMatrix::kTranslate_Mask == m.getType());

    // op + dx + dy
    size_t size = 1 * kUInt32Size + 2 * sizeof(SkScalar);
    size_t initialOffset = this->addDraw(TRANSLATE, &size);
    this->addScalar(m.getTranslateX());
    this->addScalar(m.getTranslateY());
    this->validate(initialOffset, size);
}

SkShader::MatrixClass SkShader::ComputeMatrixClass(const SkMatrix& mat) {
    MatrixClass mc = kLinear_MatrixClass;

    if (mat.getType() & SkMatrix::kPerspective_Mask) {
        if (mat.fixedStepInX(0, NULL, NULL)) {
            mc = kFixedStepInX_MatrixClass;
        } else {
            mc = kPerspective_MatrixClass;
        }
    }
    return mc;
}

static void do_concat(SkWStream* stream, const SkMatrix& matrix, bool isSetMatrix) {
    unsigned mtype = matrix.getType();
    SkASSERT(0 == (mtype & ~kTypeMask_ConcatMask));
    unsigned extra = mtype;
    if (isSetMatrix) {
        extra |= kSetMatrix_ConcatMask;
    }
    if (mtype || isSetMatrix) {
        stream->write32(pack_verb(SkPipeVerb::kConcat, extra));
        write_sparse_matrix(stream, matrix);
    }
}

sk_sp<SkImageFilter> SkLocalMatrixImageFilter::Make(const SkMatrix& localM,
                                                    sk_sp<SkImageFilter> input) {
    if (!input) {
        return nullptr;
    }
    if (localM.getType() & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) {
        return nullptr;
    }
    if (localM.isIdentity()) {
        return input;
    }
    return sk_sp<SkImageFilter>(new SkLocalMatrixImageFilter(localM, input));
}

void SkPictureRecord::didConcat(const SkMatrix& matrix) {
    switch (matrix.getType()) {
        case SkMatrix::kTranslate_Mask:
            this->recordTranslate(matrix);
            break;
        case SkMatrix::kScale_Mask:
            this->recordScale(matrix);
            break;
        default:
            this->recordConcat(matrix);
            break;
    }
    this->INHERITED::didConcat(matrix);
}