C++ SkScalarToFloat函数代码示例

 MorphologyBench(SkScalar rad, MorphologyType style)
      {
     fRadius = rad;
     fStyle = style;
     const char* name = rad > 0 ? gStyleName[style] : "none";
     if (SkScalarFraction(rad) != 0) {
         fName.printf("morph_%.2f_%s", SkScalarToFloat(rad), name);
     } else {
         fName.printf("morph_%d_%s", SkScalarRoundToInt(rad), name);
     }
 }

float SkTouchGesture::limitTotalZoom(float scale) const {
    // this query works 'cause we know that we're square-scale w/ no skew/rotation
    const float curr = SkScalarToFloat(fGlobalM[0]);

    if (scale > 1 && curr * scale > MAX_ZOOM_SCALE) {
        scale = MAX_ZOOM_SCALE / curr;
    } else if (scale < 1 && curr * scale < MIN_ZOOM_SCALE) {
        scale = MIN_ZOOM_SCALE / curr;
    }
    return scale;
}

    BlurRectDirectBench(SkScalar rad) : INHERITED(rad) {
        SkString name;

        if (SkScalarFraction(rad) != 0) {
            name.printf("blurrect_direct_%.2f", SkScalarToFloat(rad));
        } else {
            name.printf("blurrect_direct_%d", SkScalarRoundToInt(rad));
        }

        this->setName(name);
    }

float Path::length() const
{
    SkScalar length = 0;
    SkPathMeasure measure(m_path, false);

    do {
        length += measure.getLength();
    } while (measure.nextContour());

    return SkScalarToFloat(length);
}

void SkTableMaskFilter::MakeGammaTable(uint8_t table[256], SkScalar gamma) {
    const float dx = 1 / 255.0f;
    const float g = SkScalarToFloat(gamma);

    float x = 0;
    for (int i = 0; i < 256; i++) {
     // float ee = powf(x, g) * 255;
        table[i] = SkPin32(sk_float_round2int(powf(x, g) * 255), 0, 255);
        x += dx;
    }
}

static void android_view_MotionEvent_nativeTransform(JNIEnv* env, jclass clazz,
        jint nativePtr, jobject matrixObj) {
    SkMatrix* matrix = android_graphics_Matrix_getSkMatrix(env, matrixObj);
    MotionEvent* event = reinterpret_cast<MotionEvent*>(nativePtr);

    float m[9];
    m[0] = SkScalarToFloat(matrix->get(SkMatrix::kMScaleX));
    m[1] = SkScalarToFloat(matrix->get(SkMatrix::kMSkewX));
    m[2] = SkScalarToFloat(matrix->get(SkMatrix::kMTransX));
    m[3] = SkScalarToFloat(matrix->get(SkMatrix::kMSkewY));
    m[4] = SkScalarToFloat(matrix->get(SkMatrix::kMScaleY));
    m[5] = SkScalarToFloat(matrix->get(SkMatrix::kMTransY));
    m[6] = SkScalarToFloat(matrix->get(SkMatrix::kMPersp0));
    m[7] = SkScalarToFloat(matrix->get(SkMatrix::kMPersp1));
    m[8] = SkScalarToFloat(matrix->get(SkMatrix::kMPersp2));
    event->transform(m);
}

 static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) {
     NPE_CHECK_RETURN_ZERO(env, jpaint);
     NPE_CHECK_RETURN_ZERO(env, text);
     
     SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint);        
     const jchar* textArray = env->GetStringChars(text, NULL);
     size_t textLength = env->GetStringLength(text);
     
     jfloat width = SkScalarToFloat(paint->measureText(textArray, textLength << 1));
     env->ReleaseStringChars(text, textArray);
     return width;
 }

static void drawGrad(SkCanvas* canvas, const SkScalar d0[], const SkScalar d1[]) {
    const SkRect bounds = SkRect::MakeXYWH(SkIntToScalar(-50),
                                           SkIntToScalar(-50),
                                           SkIntToScalar(200),
                                           SkIntToScalar(100));

    SkPoint c0 = { d0[0], d0[1] };
    SkScalar r0 = d0[2];
    SkPoint c1 = { d1[0], d1[1] };
    SkScalar r1 = d1[2];

    SkColor colors[] = { SK_ColorGREEN, SK_ColorRED };
    SkPaint paint;
    paint.setAntiAlias(true);

    SkString str;
    str.printf("%g,%g,%g  %g,%g,%g",
               SkScalarToFloat(c0.fX), SkScalarToFloat(c0.fY), SkScalarToFloat(r0),
               SkScalarToFloat(c1.fX), SkScalarToFloat(c1.fY), SkScalarToFloat(r1));
    canvas->drawText(str.c_str(), str.size(),
                     bounds.fLeft, bounds.fTop - paint.getTextSize()/2, paint);

    paint.setShader(SkGradientShader::CreateTwoPointConical(c0, r0, c1, r1,
                                                            colors, NULL, 2,
                                                            SkShader::kClamp_TileMode))->unref();
    canvas->drawRect(bounds, paint);

    paint.setShader(NULL);
    paint.setColor(0x66000000);
    paint.setStyle(SkPaint::kStroke_Style);
    canvas->drawCircle(c0.fX, c0.fY, r0, paint);
    canvas->drawCircle(c1.fX, c1.fY, r1, paint);
    canvas->drawRect(bounds, paint);
}

// Static function to create a 2D convolution
GrFragmentProcessor*
GrMatrixConvolutionEffect::CreateGaussian(GrTexture* texture,
                                          const SkIRect& bounds,
                                          const SkISize& kernelSize,
                                          SkScalar gain,
                                          SkScalar bias,
                                          const SkIPoint& kernelOffset,
                                          GrTextureDomain::Mode tileMode,
                                          bool convolveAlpha,
                                          SkScalar sigmaX,
                                          SkScalar sigmaY) {
    float kernel[MAX_KERNEL_SIZE];
    int width = kernelSize.width();
    int height = kernelSize.height();
    SkASSERT(width * height <= MAX_KERNEL_SIZE);
    float sum = 0.0f;
    float sigmaXDenom = 1.0f / (2.0f * SkScalarToFloat(SkScalarSquare(sigmaX)));
    float sigmaYDenom = 1.0f / (2.0f * SkScalarToFloat(SkScalarSquare(sigmaY)));
    int xRadius = width / 2;
    int yRadius = height / 2;
    for (int x = 0; x < width; x++) {
      float xTerm = static_cast<float>(x - xRadius);
      xTerm = xTerm * xTerm * sigmaXDenom;
      for (int y = 0; y < height; y++) {
        float yTerm = static_cast<float>(y - yRadius);
        float xyTerm = sk_float_exp(-(xTerm + yTerm * yTerm * sigmaYDenom));
        // Note that the constant term (1/(sqrt(2*pi*sigma^2)) of the Gaussian
       // is dropped here, since we renormalize the kernel below.
        kernel[y * width + x] = xyTerm;
        sum += xyTerm;
      }
    }
    // Normalize the kernel
    float scale = 1.0f / sum;
    for (int i = 0; i < width * height; ++i) {
        kernel[i] *= scale;
    }
    return new GrMatrixConvolutionEffect(texture, bounds, kernelSize, kernel, gain, bias,
                                         kernelOffset, tileMode, convolveAlpha);
}

GrMatrixConvolutionEffect::GrMatrixConvolutionEffect(GrTexture* texture,
                                                     const SkIRect& bounds,
                                                     const SkISize& kernelSize,
                                                     const SkScalar* kernel,
                                                     SkScalar gain,
                                                     SkScalar bias,
                                                     const SkIPoint& kernelOffset,
                                                     GrTextureDomain::Mode tileMode,
                                                     bool convolveAlpha)
  : INHERITED(texture, GrCoordTransform::MakeDivByTextureWHMatrix(texture)),
    fKernelSize(kernelSize),
    fGain(SkScalarToFloat(gain)),
    fBias(SkScalarToFloat(bias) / 255.0f),
    fConvolveAlpha(convolveAlpha),
    fDomain(GrTextureDomain::MakeTexelDomainForMode(texture, bounds, tileMode), tileMode) {
    this->initClassID<GrMatrixConvolutionEffect>();
    for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) {
        fKernel[i] = SkScalarToFloat(kernel[i]);
    }
    fKernelOffset[0] = static_cast<float>(kernelOffset.x());
    fKernelOffset[1] = static_cast<float>(kernelOffset.y());
}

 virtual const char* onGetName() {
     fName.printf("text_%g", SkScalarToFloat(fPaint.getTextSize()));
     if (fDoPos) {
         fName.append("_pos");
     }
     fName.appendf("_%s", fontQualityName(fPaint));
     if (SK_ColorBLACK != fPaint.getColor()) {
         fName.appendf("_%02X", fPaint.getAlpha());
     } else {
         fName.append("_BK");
     }
     return fName.c_str();
 }

void SkSet::dump(SkAnimateMaker* maker) {
    INHERITED::dump(maker);
    if (dur != 1) {
#ifdef SK_CAN_USE_FLOAT
        SkDebugf("dur=\"%g\" ", SkScalarToFloat(SkScalarDiv(dur,1000)));
#else
        SkDebugf("dur=\"%x\" ", SkScalarDiv(dur,1000));
#endif
    }
    //don't want double />\n's
    SkDebugf("/>\n");

}

void STDMETHODCALLTYPE SkDWriteGeometrySink::AddBeziers(const D2D1_BEZIER_SEGMENT *beziers, UINT beziersCount) {
    SkPoint lastPt;
    fPath->getLastPt(&lastPt);
    D2D1_POINT_2F prevPt = { SkScalarToFloat(lastPt.fX), SkScalarToFloat(lastPt.fY) };

    for (const D2D1_BEZIER_SEGMENT *end = &beziers[beziersCount]; beziers < end; ++beziers) {
        Cubic cubic = { { prevPt.x, prevPt.y },
                        { beziers->point1.x, beziers->point1.y },
                        { beziers->point2.x, beziers->point2.y },
                        { beziers->point3.x, beziers->point3.y }, };
        Quadratic quadratic;
        if (check_quadratic(cubic, quadratic)) {
            fPath->quadTo(quadratic[1].x, quadratic[1].y,
                          quadratic[2].x, quadratic[2].y);
        } else {
            fPath->cubicTo(beziers->point1.x, beziers->point1.y,
                           beziers->point2.x, beziers->point2.y,
                           beziers->point3.x, beziers->point3.y);
        }
        prevPt = beziers->point3;
    }
}

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);
}

void GrGpuGLShaders::flushTextureDomain(int s) {
    const GrGLint& uni = fProgramData->fUniLocations.fStages[s].fTexDomUni;
    if (GrGLProgram::kUnusedUniform != uni) {
        const GrRect &texDom =
            fCurrDrawState.fSamplerStates[s].getTextureDomain();

        if (((1 << s) & fDirtyFlags.fTextureChangedMask) ||
            fProgramData->fTextureDomain[s] != texDom) {

            fProgramData->fTextureDomain[s] = texDom;

            float values[4] = {
                GrScalarToFloat(texDom.left()),
                GrScalarToFloat(texDom.top()),
                GrScalarToFloat(texDom.right()),
                GrScalarToFloat(texDom.bottom())
            };

            GrGLTexture* texture = (GrGLTexture*) fCurrDrawState.fTextures[s];
            GrGLTexture::Orientation orientation = texture->orientation();

            // vertical flip if necessary
            if (GrGLTexture::kBottomUp_Orientation == orientation) {
                values[1] = 1.0f - values[1];
                values[3] = 1.0f - values[3];
                // The top and bottom were just flipped, so correct the ordering
                // of elements so that values = (l, t, r, b).
                SkTSwap(values[1], values[3]);
            }

            values[0] *= SkScalarToFloat(texture->contentScaleX());
            values[2] *= SkScalarToFloat(texture->contentScaleX());
            values[1] *= SkScalarToFloat(texture->contentScaleY());
            values[3] *= SkScalarToFloat(texture->contentScaleY());

            GL_CALL(Uniform4fv(uni, 1, values));
        }
    }
}