C++ SkScalarRound函数代码示例

static SkColor HSV_to_RGB(SkColor color, HSV_Choice choice, SkScalar hsv) {
    SkScalar hue = choice == kGetHue ? hsv : RGB_to_HSV(color, kGetHue);
    SkScalar saturation = choice == kGetSaturation ? hsv : RGB_to_HSV(color, kGetSaturation);
    SkScalar value = choice == kGetValue ? hsv : RGB_to_HSV(color, kGetValue);
    value *= 255;
    SkScalar red SK_INIT_TO_AVOID_WARNING;
    SkScalar green SK_INIT_TO_AVOID_WARNING;
    SkScalar blue SK_INIT_TO_AVOID_WARNING;
    if (saturation == 0)    // color is on black-and-white center line
        red = green = blue = value;
    else {
        //SkScalar fraction = SkScalarMod(hue, 60 * SK_Scalar1);
        int sextant = SkScalarFloor(hue / 60);
        SkScalar fraction = hue / 60 - SkIntToScalar(sextant);
        SkScalar p = SkScalarMul(value , SK_Scalar1 - saturation);
        SkScalar q = SkScalarMul(value, SK_Scalar1 - SkScalarMul(saturation, fraction));
        SkScalar t = SkScalarMul(value, SK_Scalar1 - 
            SkScalarMul(saturation, SK_Scalar1 - fraction));
        switch (sextant % 6) {
            case 0: red = value; green = t; blue = p; break;
            case 1: red = q; green = value; blue = p; break;
            case 2: red = p; green = value; blue = t; break;
            case 3: red = p; green = q; blue = value; break;
            case 4: red = t;  green = p; blue = value; break;
            case 5: red = value; green = p; blue = q; break;
        }
    }
    //used to say SkToU8((U8CPU) red) etc
    return SkColorSetARGB(SkColorGetA(color), SkScalarRound(red), 
        SkScalarRound(green), SkScalarRound(blue));
}

static int count_path_runtype_values(const SkPath& path, int* itop, int* ibot) {
    SkPath::Iter    iter(path, true);
    SkPoint         pts[4];
    SkPath::Verb    verb;

    int maxEdges = 0;
    SkScalar    top = SkIntToScalar(SK_MaxS16);
    SkScalar    bot = SkIntToScalar(SK_MinS16);

    while ((verb = iter.next(pts, false)) != SkPath::kDone_Verb) {
        maxEdges += verb_to_max_edges(verb);

        int lastIndex = verb_to_initial_last_index(verb);
        if (lastIndex > 0) {
            for (int i = 1; i <= lastIndex; i++) {
                if (top > pts[i].fY) {
                    top = pts[i].fY;
                } else if (bot < pts[i].fY) {
                    bot = pts[i].fY;
                }
            }
        } else if (SkPath::kMove_Verb == verb) {
            if (top > pts[0].fY) {
                top = pts[0].fY;
            } else if (bot < pts[0].fY) {
                bot = pts[0].fY;
            }
        }
    }
    SkASSERT(top <= bot);

    *itop = SkScalarRound(top);
    *ibot = SkScalarRound(bot);
    return maxEdges;
}

bool SkOSWindow::attach(SkBackEndTypes /* attachType */, int msaaSampleCount) {
    this->initWindow(msaaSampleCount);
    if (NULL == fUnixWindow.fDisplay) {
        return false;
    } 
    if (NULL == fUnixWindow.fGLContext) {
        SkASSERT(NULL != fVi);

        fUnixWindow.fGLContext = glXCreateContext(fUnixWindow.fDisplay,
                                                  fVi,
                                                  NULL,
                                                  GL_TRUE);
        if (NULL == fUnixWindow.fGLContext) {
            return false;
        }
    }
    glXMakeCurrent(fUnixWindow.fDisplay,
                   fUnixWindow.fWin,
                   fUnixWindow.fGLContext);
    glViewport(0, 0,
               SkScalarRound(this->width()), SkScalarRound(this->height()));
    glClearColor(0, 0, 0, 0);
    glClearStencil(0);
    glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
    return true;
}

    void drawMask(SkCanvas* canvas, const SkRect& r) {
        SkPaint paint;
        paint.setAntiAlias(true);

        if (true) {
            SkBitmap mask;
            int w = SkScalarRound(r.width());
            int h = SkScalarRound(r.height());
            mask.setConfig(SkBitmap::kARGB_8888_Config, w, h);
            mask.allocPixels();
            mask.eraseColor(0);
            SkCanvas c(mask);
            SkRect bounds = r;
            bounds.offset(-bounds.fLeft, -bounds.fTop);
            c.drawOval(bounds, paint);
            
            paint.setXfermodeMode(SkXfermode::kDstIn_Mode);
            canvas->drawBitmap(mask, r.fLeft, r.fTop, &paint);
        } else {
            SkPath p;
            p.addOval(r);
            p.setFillType(SkPath::kInverseWinding_FillType);
            paint.setXfermodeMode(SkXfermode::kDstOut_Mode);
            canvas->drawPath(p, paint);
        }
    }

void addCornerArc(SkPath* path, const SkRect& rect, const IntSize& size, int startAngle)
{
    SkIRect ir;
    int rx = SkMin32(SkScalarRound(rect.width()), size.width());
    int ry = SkMin32(SkScalarRound(rect.height()), size.height());

    ir.set(-rx, -ry, rx, ry);
    switch (startAngle) {
    case 0:
        ir.offset(rect.fRight - ir.fRight, rect.fBottom - ir.fBottom);
        break;
    case 90:
        ir.offset(rect.fLeft - ir.fLeft, rect.fBottom - ir.fBottom);
        break;
    case 180:
        ir.offset(rect.fLeft - ir.fLeft, rect.fTop - ir.fTop);
        break;
    case 270:
        ir.offset(rect.fRight - ir.fRight, rect.fTop - ir.fTop);
        break;
    default:
        ASSERT(0);
    }

    SkRect r;
    r.set(ir);
    path->arcTo(r, SkIntToScalar(startAngle), SkIntToScalar(90), false);
}

static void round(SkIRect* dst, const WebCore::FloatRect& src)
{
    dst->set(SkScalarRound(SkFloatToScalar(src.x())),
             SkScalarRound(SkFloatToScalar(src.y())),
             SkScalarRound(SkFloatToScalar((src.x() + src.width()))),
             SkScalarRound(SkFloatToScalar((src.y() + src.height()))));
}

static void lettersToBitmap2(SkBitmap* dst, const char chars[],
                            const SkPaint& original, SkBitmap::Config config) {
    SkPath path;
    SkScalar x = 0;
    SkScalar width;
    SkPath p;
    for (size_t i = 0; i < strlen(chars); i++) {
        original.getTextPath(&chars[i], 1, x, 0, &p);
        path.addPath(p);
        original.getTextWidths(&chars[i], 1, &width);
        x += width;
    }
    SkRect bounds = path.getBounds();
    SkScalar sw = -original.getStrokeWidth();
    bounds.inset(sw, sw);
    path.offset(-bounds.fLeft, -bounds.fTop);
    bounds.offset(-bounds.fLeft, -bounds.fTop);

    int w = SkScalarRound(bounds.width());
    int h = SkScalarRound(bounds.height());
    SkPaint paint(original);

    paint.setAntiAlias(true);
    paint.setXfermodeMode(SkXfermode::kDstATop_Mode);
    paint.setColor(original.getColor());
    paint.setStyle(SkPaint::kStroke_Style);

    dst->setConfig(config, w, h);
    dst->allocPixels();
    dst->eraseColor(SK_ColorWHITE);

    SkCanvas canvas(*dst);
    canvas.drawPath(path, paint);
}

static int count_path_runtype_values(const SkPath& path, int* itop, int* ibot) {
    static const uint8_t gPathVerbToInitialLastIndex[] = {
        0,  //  kMove_Verb
        1,  //  kLine_Verb
        2,  //  kQuad_Verb
        3,  //  kCubic_Verb
        0,  //  kClose_Verb
        0   //  kDone_Verb
    };

    static const uint8_t gPathVerbToMaxEdges[] = {
        0,  //  kMove_Verb
        1,  //  kLine_Verb
        2,  //  kQuad_VerbB
        3,  //  kCubic_Verb
        0,  //  kClose_Verb
        0   //  kDone_Verb
    };

    SkPath::Iter    iter(path, true);
    SkPoint         pts[4];
    SkPath::Verb    verb;

    int maxEdges = 0;
    SkScalar    top = SkIntToScalar(SK_MaxS16);
    SkScalar    bot = SkIntToScalar(SK_MinS16);

    while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
        maxEdges += gPathVerbToMaxEdges[verb];

        int lastIndex = gPathVerbToInitialLastIndex[verb];
        if (lastIndex > 0) {
            for (int i = 1; i <= lastIndex; i++) {
                if (top > pts[i].fY) {
                    top = pts[i].fY;
                } else if (bot < pts[i].fY) {
                    bot = pts[i].fY;
                }
            }
        } else if (SkPath::kMove_Verb == verb) {
            if (top > pts[0].fY) {
                top = pts[0].fY;
            } else if (bot < pts[0].fY) {
                bot = pts[0].fY;
            }
        }
    }
    SkASSERT(top <= bot);

    *itop = SkScalarRound(top);
    *ibot = SkScalarRound(bot);
    return maxEdges;
}

        virtual void onDrawContent(SkCanvas* canvas)
            {
            canvas->translate(SkIntToScalar(10), SkIntToScalar(50));

            const SkScalar W = SkIntToScalar(fBitmaps[0].width() + 1);
            const SkScalar H = SkIntToScalar(fBitmaps[0].height() + 1);
            SkPaint paint;

            const SkScalar scale = SkFloatToScalar(0.897917f);
            canvas->scale(SK_Scalar1, scale);

            for (int k = 0; k < 2; k++)
                {
                paint.setFilterBitmap(k == 1);
                for (int j = 0; j < 2; j++)
                    {
                    paint.setDither(j == 1);
                    for (int i = 0; i < fBitmapCount; i++)
                        {
                        SkScalar x = (k * fBitmapCount + j) * W;
                        SkScalar y = i * H;
                        x = SkIntToScalar(SkScalarRound(x));
                        y = SkIntToScalar(SkScalarRound(y));
                        canvas->drawBitmap(fBitmaps[i], x, y, &paint);
                        if (i == 0)
                            {
                            SkPaint p;
                            p.setAntiAlias(true);
                            p.setTextAlign(SkPaint::kCenter_Align);
                            p.setTextSize(SkIntToScalar(18));
                            SkString s("dither=");
                            s.appendS32(paint.isDither());
                            s.append(" filter=");
                            s.appendS32(paint.isFilterBitmap());
                            canvas->drawText(s.c_str(), s.size(), x + W/2,
                                             y - p.getTextSize(), p);
                            }
                        if (k+j == 2)
                            {
                            SkPaint p;
                            p.setAntiAlias(true);
                            p.setTextSize(SkIntToScalar(18));
                            SkString s;
                            s.append(" depth=");
                            s.appendS32(fBitmaps[i].config() == SkBitmap::kRGB_565_Config ? 16 : 32);
                            canvas->drawText(s.c_str(), s.size(), x + W + SkIntToScalar(4),
                                             y + H/2, p);
                            }
                        }
                    }
                }
            }

SkScalerContext_Ascender::SkScalerContext_Ascender(const SkDescriptor* desc)
    : SkScalerContext(desc)
{
    int size = aca_Get_FontHandleRec_Size();
    fHandle = (aca_FontHandle)sk_malloc_throw(size);
    
    // get the pointer to the font
    
    fFontStream = new SkMMAPStream("/UcsGB2312-Hei-H.FDL");
    fHintStream = new SkMMAPStream("/genv6-23.bin");
    
    void* hints = sk_malloc_throw(fHintStream->getLength());
    memcpy(hints, fHintStream->getMemoryBase(), fHintStream->getLength());
    
    aca_Create_Font_Handle(fHandle,
                           (void*)fFontStream->getMemoryBase(), fFontStream->getLength(),
                           "fred",
                           hints, fHintStream->getLength());
    
    // compute our factors from the record

    SkMatrix    m;

    fRec.getSingleMatrix(&m);

    //  now compute our scale factors
    SkScalar    sx = m.getScaleX();
    SkScalar    sy = m.getScaleY();
    
    int ppemX = SkScalarRound(sx);
    int ppemY = SkScalarRound(sy);
    
    size = aca_Find_Font_Memory_Required(fHandle, ppemX, ppemY);
    size *= 8;  // Jeff suggests this :)
    fWorkspace = sk_malloc_throw(size);
    aca_Set_Font_Memory(fHandle, (uint8_t*)fWorkspace, size);

    aca_GlyphAttribsRec rec;
    
    memset(&rec, 0, sizeof(rec));
    rec.xSize = ppemX;
    rec.ySize = ppemY;
    rec.doAdjust = true;
    rec.doExceptions = true;
    rec.doGlyphHints = true;
    rec.doInterpolate = true;
    rec.grayMode = 2;
    aca_Set_Font_Attributes(fHandle, &rec, &size);
    
    fGlyphWorkspace = sk_malloc_throw(size);
    aca_Set_Glyph_Memory(fHandle, fGlyphWorkspace);
}

    HRGN Path::CreateNativeRegion() const
    {
        int point_count = getPoints(NULL, 0);
        scoped_array<SkPoint> points(new SkPoint[point_count]);
        getPoints(points.get(), point_count);
        scoped_array<POINT> windows_points(new POINT[point_count]);
        for(int i=0; i<point_count; ++i)
        {
            windows_points[i].x = SkScalarRound(points[i].fX);
            windows_points[i].y = SkScalarRound(points[i].fY);
        }

        return ::CreatePolygonRgn(windows_points.get(), point_count, ALTERNATE);
    }

int Font::offsetForPositionForComplexText(const TextRun& run, int x,
                                          bool includePartialGlyphs) const
{
    SkPaint                         paint;
    int                             count = run.length();
    SkAutoSTMalloc<64, SkScalar>    storage(count);
    SkScalar*                       widths = storage.get();
    SkAutoSTMalloc<64, int>    storageClusterIndex(count);
    int*                       clusterIndex = storageClusterIndex.get();

    primaryFont()->platformData().setupPaint(&paint);

    //count = paint.getTextWidths(run.characters(), count << 1, widths);
    count = paint.getComplexTextWidths(run.characters(), count << 1, widths, clusterIndex);

    if (count > 0)
    {
        SkScalar pos = 0;
        for (int i = 0; i < count; i++)
        {
            if (x < SkScalarRound(pos + SkScalarHalf(widths[i])))
                return clusterIndex[i];
            pos += widths[i];
        }
    }
    return run.length();
}

SkInterpolatorBase::Result SkOperandInterpolator::timeToValues(SkMSec time, SkOperand values[]) const
{
    SkScalar T;
    int index;
    SkBool exact;
    Result result = timeToT(time, &T, &index, &exact);
    if (values)
    {
        const SkOperand* nextSrc = &fValues[index * fElemCount];

        if (exact)
            memcpy(values, nextSrc, fElemCount * sizeof(SkScalar));
        else
        {
            SkASSERT(index > 0);

            const SkOperand* prevSrc = nextSrc - fElemCount;

            if (fType == SkType_Float || fType == SkType_3D_Point) {
                for (int i = fElemCount - 1; i >= 0; --i)
                    values[i].fScalar = SkScalarInterp(prevSrc[i].fScalar, nextSrc[i].fScalar, T);
            } else if (fType == SkType_Int || fType == SkType_MSec) {
                for (int i = fElemCount - 1; i >= 0; --i) {
                    int32_t a = prevSrc[i].fS32;
                    int32_t b = nextSrc[i].fS32;
                    values[i].fS32 = a + SkScalarRound((b - a) * T);
                }
            } else
                memcpy(values, prevSrc, sizeof(SkOperand) * fElemCount);
        }
    }
    return result;
}

/**
 *  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) {
    SkMatrix::TypeMask mask = matrix.getType();

    if (mask & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) {
        return false;
    }
    if (mask & SkMatrix::kScale_Mask) {
        SkScalar sx = matrix[SkMatrix::kMScaleX];
        SkScalar sy = matrix[SkMatrix::kMScaleY];
        int w = bitmap.width();
        int h = bitmap.height();
        int sw = SkScalarRound(SkScalarMul(sx, SkIntToScalar(w)));
        int sh = SkScalarRound(SkScalarMul(sy, SkIntToScalar(h)));
        return sw == w && sh == h;
    }
    // if we got here, we're either kTranslate_Mask or identity
    return true;
}

    static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) {
        NPE_CHECK_RETURN_ZERO(env, paint);
        SkPaint::FontMetrics metrics;
        
        GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
        int ascent = SkScalarRound(metrics.fAscent);
        int descent = SkScalarRound(metrics.fDescent);
        int leading = SkScalarRound(metrics.fLeading);

        if (metricsObj) {
            SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class));
            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop));
            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent);
            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent);
            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom));
            env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading);
        }
        return descent - ascent + leading;
    }