C++ SkMatrix::getTranslateX方法代码示例

/**
 *  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 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());
    }
}

void SkGPipeCanvas::recordTranslate(const SkMatrix& m) {
    if (this->needOpBytes(2 * sizeof(SkScalar))) {
        this->writeOp(kTranslate_DrawOp);
        fWriter.writeScalar(m.getTranslateX());
        fWriter.writeScalar(m.getTranslateY());
    }
}

bool GrBicubicEffect::ShouldUseBicubic(const SkMatrix& matrix,
                                       GrTextureParams::FilterMode* filterMode) {
    if (matrix.isIdentity()) {
        *filterMode = GrTextureParams::kNone_FilterMode;
        return false;
    }

    SkScalar scales[2];
    if (!matrix.getMinMaxScales(scales) || scales[0] < SK_Scalar1) {
        // Bicubic doesn't handle arbitrary minimization well, as src texels can be skipped
        // entirely,
        *filterMode = GrTextureParams::kMipMap_FilterMode;
        return false;
    }
    // At this point if scales[1] == SK_Scalar1 then the matrix doesn't do any scaling.
    if (scales[1] == SK_Scalar1) {
        if (matrix.rectStaysRect() && SkScalarIsInt(matrix.getTranslateX()) &&
                SkScalarIsInt(matrix.getTranslateY())) {
            *filterMode = GrTextureParams::kNone_FilterMode;
        } else {
            // Use bilerp to handle rotation or fractional translation.
            *filterMode = GrTextureParams::kBilerp_FilterMode;
        }
        return false;
    }
    // When we use the bicubic filtering effect each sample is read from the texture using
    // nearest neighbor sampling.
    *filterMode = GrTextureParams::kNone_FilterMode;
    return true;
}

void GrCCPathParser::parsePath(const SkMatrix& m, const SkPath& path, SkRect* devBounds,
                               SkRect* devBounds45) {
    const SkPoint* pts = SkPathPriv::PointData(path);
    int numPts = path.countPoints();
    SkASSERT(numPts + 1 <= fLocalDevPtsBuffer.count());

    if (!numPts) {
        devBounds->setEmpty();
        devBounds45->setEmpty();
        this->parsePath(path, nullptr);
        return;
    }

    // m45 transforms path points into "45 degree" device space. A bounding box in this space gives
    // the circumscribing octagon's diagonals. We could use SK_ScalarRoot2Over2, but an orthonormal
    // transform is not necessary as long as the shader uses the correct inverse.
    SkMatrix m45;
    m45.setSinCos(1, 1);
    m45.preConcat(m);

    // X,Y,T are two parallel view matrices that accumulate two bounding boxes as they map points:
    // device-space bounds and "45 degree" device-space bounds (| 1 -1 | * devCoords).
    //                                                          | 1  1 |
    Sk4f X = Sk4f(m.getScaleX(), m.getSkewY(), m45.getScaleX(), m45.getSkewY());
    Sk4f Y = Sk4f(m.getSkewX(), m.getScaleY(), m45.getSkewX(), m45.getScaleY());
    Sk4f T = Sk4f(m.getTranslateX(), m.getTranslateY(), m45.getTranslateX(), m45.getTranslateY());

    // Map the path's points to device space and accumulate bounding boxes.
    Sk4f devPt = SkNx_fma(Y, Sk4f(pts[0].y()), T);
    devPt = SkNx_fma(X, Sk4f(pts[0].x()), devPt);
    Sk4f topLeft = devPt;
    Sk4f bottomRight = devPt;

    // Store all 4 values [dev.x, dev.y, dev45.x, dev45.y]. We are only interested in the first two,
    // and will overwrite [dev45.x, dev45.y] with the next point. This is why the dst buffer must
    // be at least one larger than the number of points.
    devPt.store(&fLocalDevPtsBuffer[0]);

    for (int i = 1; i < numPts; ++i) {
        devPt = SkNx_fma(Y, Sk4f(pts[i].y()), T);
        devPt = SkNx_fma(X, Sk4f(pts[i].x()), devPt);
        topLeft = Sk4f::Min(topLeft, devPt);
        bottomRight = Sk4f::Max(bottomRight, devPt);
        devPt.store(&fLocalDevPtsBuffer[i]);
    }

    SkPoint topLeftPts[2], bottomRightPts[2];
    topLeft.store(topLeftPts);
    bottomRight.store(bottomRightPts);
    devBounds->setLTRB(topLeftPts[0].x(), topLeftPts[0].y(), bottomRightPts[0].x(),
                       bottomRightPts[0].y());
    devBounds45->setLTRB(topLeftPts[1].x(), topLeftPts[1].y(), bottomRightPts[1].x(),
                         bottomRightPts[1].y());

    this->parsePath(path, fLocalDevPtsBuffer.get());
}

sk_sp<GrFragmentProcessor> SkPerlinNoiseShader::asFragmentProcessor(const AsFPArgs& args) const {
    SkASSERT(args.fContext);

    SkMatrix localMatrix = this->getLocalMatrix();
    if (args.fLocalMatrix) {
        localMatrix.preConcat(*args.fLocalMatrix);
    }

    SkMatrix matrix = *args.fViewMatrix;
    matrix.preConcat(localMatrix);

    if (0 == fNumOctaves) {
        if (kFractalNoise_Type == fType) {
            // Extract the incoming alpha and emit rgba = (a/4, a/4, a/4, a/2)
            // TODO: Either treat the output of this shader as sRGB or allow client to specify a
            // color space of the noise. Either way, this case (and the GLSL) need to convert to
            // the destination.
            sk_sp<GrFragmentProcessor> inner(
                GrConstColorProcessor::Make(GrColor4f::FromGrColor(0x80404040),
                                            GrConstColorProcessor::kModulateRGBA_InputMode));
            return GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner));
        }
        // Emit zero.
        return GrConstColorProcessor::Make(GrColor4f::TransparentBlack(),
                                           GrConstColorProcessor::kIgnore_InputMode);
    }

    // Either we don't stitch tiles, either we have a valid tile size
    SkASSERT(!fStitchTiles || !fTileSize.isEmpty());

    SkPerlinNoiseShader::PaintingData* paintingData =
            new PaintingData(fTileSize, fSeed, fBaseFrequencyX, fBaseFrequencyY, matrix);
    sk_sp<GrTextureProxy> permutationsProxy(GrMakeCachedBitmapProxy(
                                                            args.fContext->resourceProvider(),
                                                            paintingData->getPermutationsBitmap()));
    sk_sp<GrTextureProxy> noiseProxy(GrMakeCachedBitmapProxy(args.fContext->resourceProvider(),
                                                             paintingData->getNoiseBitmap()));

    SkMatrix m = *args.fViewMatrix;
    m.setTranslateX(-localMatrix.getTranslateX() + SK_Scalar1);
    m.setTranslateY(-localMatrix.getTranslateY() + SK_Scalar1);
    if (permutationsProxy && noiseProxy) {
        sk_sp<GrFragmentProcessor> inner(
            GrPerlinNoiseEffect::Make(args.fContext->resourceProvider(),
                                      fType,
                                      fNumOctaves,
                                      fStitchTiles,
                                      paintingData,
                                      std::move(permutationsProxy),
                                      std::move(noiseProxy),
                                      m));
        return GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner));
    }
    delete paintingData;
    return nullptr;
}

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);
}

static void calculate_translation(bool applyVM,
                                  const SkMatrix& newViewMatrix, SkScalar newX, SkScalar newY,
                                  const SkMatrix& currentViewMatrix, SkScalar currentX,
                                  SkScalar currentY, SkScalar* transX, SkScalar* transY) {
    if (applyVM) {
        *transX = newViewMatrix.getTranslateX() +
                  newViewMatrix.getScaleX() * (newX - currentX) +
                  newViewMatrix.getSkewX() * (newY - currentY) -
                  currentViewMatrix.getTranslateX();

        *transY = newViewMatrix.getTranslateY() +
                  newViewMatrix.getSkewY() * (newX - currentX) +
                  newViewMatrix.getScaleY() * (newY - currentY) -
                  currentViewMatrix.getTranslateY();
    } else {
        *transX = newX - currentX;
        *transY = newY - currentY;
    }
}

const GrFragmentProcessor* SkPerlinNoiseShader::asFragmentProcessor(
                                                    GrContext* context,
                                                    const SkMatrix& viewM,
                                                    const SkMatrix* externalLocalMatrix,
                                                    SkFilterQuality) const {
    SkASSERT(context);

    SkMatrix localMatrix = this->getLocalMatrix();
    if (externalLocalMatrix) {
        localMatrix.preConcat(*externalLocalMatrix);
    }

    SkMatrix matrix = viewM;
    matrix.preConcat(localMatrix);

    if (0 == fNumOctaves) {
        if (kFractalNoise_Type == fType) {
            // Extract the incoming alpha and emit rgba = (a/4, a/4, a/4, a/2)
            SkAutoTUnref<const GrFragmentProcessor> inner(
                GrConstColorProcessor::Create(0x80404040,
                                              GrConstColorProcessor::kModulateRGBA_InputMode));
            return GrFragmentProcessor::MulOutputByInputAlpha(inner);
        }
        // Emit zero.
        return GrConstColorProcessor::Create(0x0, GrConstColorProcessor::kIgnore_InputMode);
    }

    // Either we don't stitch tiles, either we have a valid tile size
    SkASSERT(!fStitchTiles || !fTileSize.isEmpty());

    SkPerlinNoiseShader::PaintingData* paintingData =
            new PaintingData(fTileSize, fSeed, fBaseFrequencyX, fBaseFrequencyY, matrix);
    SkAutoTUnref<GrTexture> permutationsTexture(
        GrRefCachedBitmapTexture(context, paintingData->getPermutationsBitmap(),
                                 GrTextureParams::ClampNoFilter()));
    SkAutoTUnref<GrTexture> noiseTexture(
        GrRefCachedBitmapTexture(context, paintingData->getNoiseBitmap(),
                                 GrTextureParams::ClampNoFilter()));

    SkMatrix m = viewM;
    m.setTranslateX(-localMatrix.getTranslateX() + SK_Scalar1);
    m.setTranslateY(-localMatrix.getTranslateY() + SK_Scalar1);
    if ((permutationsTexture) && (noiseTexture)) {
        SkAutoTUnref<GrFragmentProcessor> inner(
            GrPerlinNoiseEffect::Create(fType,
                                        fNumOctaves,
                                        fStitchTiles,
                                        paintingData,
                                        permutationsTexture, noiseTexture,
                                        m));
        return GrFragmentProcessor::MulOutputByInputAlpha(inner);
    }
    delete paintingData;
    return nullptr;
}

SkLinearBitmapPipeline::SkLinearBitmapPipeline(
    const SkMatrix& inverse,
    SkFilterQuality filterQuality,
    SkShader::TileMode xTile, SkShader::TileMode yTile,
    SkColor paintColor,
    const SkPixmap& srcPixmap)
{
    SkISize dimensions = srcPixmap.info().dimensions();
    const SkImageInfo& srcImageInfo = srcPixmap.info();

    SkMatrix adjustedInverse = inverse;
    if (filterQuality == kNone_SkFilterQuality) {
        if (inverse.getScaleX() >= 0.0f) {
            adjustedInverse.setTranslateX(
                nextafterf(inverse.getTranslateX(), std::floor(inverse.getTranslateX())));
        }
        if (inverse.getScaleY() >= 0.0f) {
            adjustedInverse.setTranslateY(
                nextafterf(inverse.getTranslateY(), std::floor(inverse.getTranslateY())));
        }
    }

    SkScalar dx = adjustedInverse.getScaleX();

    // If it is an index 8 color type, the sampler converts to unpremul for better fidelity.
    SkAlphaType alphaType = srcImageInfo.alphaType();
    if (srcPixmap.colorType() == kIndex_8_SkColorType) {
        alphaType = kUnpremul_SkAlphaType;
    }

    float postAlpha = SkColorGetA(paintColor) * (1.0f / 255.0f);
    // As the stages are built, the chooser function may skip a stage. For example, with the
    // identity matrix, the matrix stage is skipped, and the tilerStage is the first stage.
    auto blenderStage = choose_blender_for_shading(alphaType, postAlpha, &fBlenderStage);
    auto samplerStage = choose_pixel_sampler(
        blenderStage, filterQuality, xTile, yTile,
        srcPixmap, paintColor, &fSampleStage, &fAccessor);
    auto tilerStage   = choose_tiler(samplerStage, dimensions, xTile, yTile,
                                     filterQuality, dx, &fTileStage);
    fFirstStage       = choose_matrix(tilerStage, adjustedInverse, &fMatrixStage);
    fLastStage        = blenderStage;
}

void SkLatticeIter::mapDstScaleTranslate(const SkMatrix& matrix) {
    SkASSERT(matrix.isScaleTranslate());
    SkScalar tx = matrix.getTranslateX();
    SkScalar sx = matrix.getScaleX();
    for (int i = 0; i < fDstX.count(); i++) {
        fDstX[i] = fDstX[i] * sx + tx;
    }

    SkScalar ty = matrix.getTranslateY();
    SkScalar sy = matrix.getScaleY();
    for (int i = 0; i < fDstY.count(); i++) {
        fDstY[i] = fDstY[i] * sy + ty;
    }
}

SkPerlinNoiseShader::PerlinNoiseShaderContext::PerlinNoiseShaderContext(
        const SkPerlinNoiseShader& shader, const ContextRec& rec)
    : INHERITED(shader, rec)
{
    SkMatrix newMatrix = *rec.fMatrix;
    newMatrix.preConcat(shader.getLocalMatrix());
    if (rec.fLocalMatrix) {
        newMatrix.preConcat(*rec.fLocalMatrix);
    }
    // This (1,1) translation is due to WebKit's 1 based coordinates for the noise
    // (as opposed to 0 based, usually). The same adjustment is in the setData() function.
    fMatrix.setTranslate(-newMatrix.getTranslateX() + SK_Scalar1, -newMatrix.getTranslateY() + SK_Scalar1);
    fPaintingData = SkNEW_ARGS(PaintingData, (shader.fTileSize, shader.fSeed, shader.fBaseFrequencyX, shader.fBaseFrequencyY, newMatrix));
}

GrCCPathCache::MaskTransform::MaskTransform(const SkMatrix& m, SkIVector* shift)
        : fMatrix2x2{m.getScaleX(), m.getSkewX(), m.getSkewY(), m.getScaleY()} {
    SkASSERT(!m.hasPerspective());
    Sk2f translate = Sk2f(m.getTranslateX(), m.getTranslateY());
    Sk2f transFloor;
#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
    // On Android framework we pre-round view matrix translates to integers for better caching.
    transFloor = translate;
#else
    transFloor = translate.floor();
    (translate - transFloor).store(fSubpixelTranslate);
#endif
    shift->set((int)transFloor[0], (int)transFloor[1]);
    SkASSERT((float)shift->fX == transFloor[0]);  // Make sure transFloor had integer values.
    SkASSERT((float)shift->fY == transFloor[1]);
}

void SkFlatMatrix::dump() const {
    const SkMatrix* matrix = (const SkMatrix*) fMatrixData;
    char pBuffer[DUMP_BUFFER_SIZE];
    char* bufferPtr = pBuffer;
    bufferPtr += snprintf(bufferPtr, DUMP_BUFFER_SIZE - (bufferPtr - pBuffer), 
    "matrix: ");
    SkScalar scaleX = matrix->getScaleX();
    SkMatrix defaultMatrix;
    defaultMatrix.reset();
    if (scaleX != defaultMatrix.getScaleX())
        bufferPtr += snprintf(bufferPtr, DUMP_BUFFER_SIZE - (bufferPtr - pBuffer), 
            "scaleX:%g ", SkScalarToFloat(scaleX));
    SkScalar scaleY = matrix->getScaleY();
    if (scaleY != defaultMatrix.getScaleY())
        bufferPtr += snprintf(bufferPtr, DUMP_BUFFER_SIZE - (bufferPtr - pBuffer), 
            "scaleY:%g ", SkScalarToFloat(scaleY));
    SkScalar skewX = matrix->getSkewX();
    if (skewX != defaultMatrix.getSkewX())
        bufferPtr += snprintf(bufferPtr, DUMP_BUFFER_SIZE - (bufferPtr - pBuffer), 
            "skewX:%g ", SkScalarToFloat(skewX));
    SkScalar skewY = matrix->getSkewY();
    if (skewY != defaultMatrix.getSkewY())
        bufferPtr += snprintf(bufferPtr, DUMP_BUFFER_SIZE - (bufferPtr - pBuffer), 
            "skewY:%g ", SkScalarToFloat(skewY));
    SkScalar translateX = matrix->getTranslateX();
    if (translateX != defaultMatrix.getTranslateX())
        bufferPtr += snprintf(bufferPtr, DUMP_BUFFER_SIZE - (bufferPtr - pBuffer), 
            "translateX:%g ", SkScalarToFloat(translateX));
    SkScalar translateY = matrix->getTranslateY();
    if (translateY != defaultMatrix.getTranslateY())
        bufferPtr += snprintf(bufferPtr, DUMP_BUFFER_SIZE - (bufferPtr - pBuffer), 
            "translateY:%g ", SkScalarToFloat(translateY));
    SkScalar perspX = matrix->getPerspX();
    if (perspX != defaultMatrix.getPerspX())
        bufferPtr += snprintf(bufferPtr, DUMP_BUFFER_SIZE - (bufferPtr - pBuffer), 
            "perspX:%g ", SkFractToFloat(perspX));
    SkScalar perspY = matrix->getPerspY();
    if (perspY != defaultMatrix.getPerspY())
        bufferPtr += snprintf(bufferPtr, DUMP_BUFFER_SIZE - (bufferPtr - pBuffer), 
            "perspY:%g ", SkFractToFloat(perspY));
    SkDebugf("%s\n", pBuffer);
}

void SkDumpCanvas::didConcat(const SkMatrix& matrix) {
    SkString str;

    switch (matrix.getType()) {
        case SkMatrix::kTranslate_Mask:
            this->dump(kMatrix_Verb, nullptr, "translate(%g %g)",
                       SkScalarToFloat(matrix.getTranslateX()),
                       SkScalarToFloat(matrix.getTranslateY()));
            break;
        case SkMatrix::kScale_Mask:
            this->dump(kMatrix_Verb, nullptr, "scale(%g %g)",
                       SkScalarToFloat(matrix.getScaleX()),
                       SkScalarToFloat(matrix.getScaleY()));
            break;
        default:
            matrix.toString(&str);
            this->dump(kMatrix_Verb, nullptr, "concat(%s)", str.c_str());
            break;
    }

    this->INHERITED::didConcat(matrix);
}