C++ SkGetPackedR32函数代码示例

static SkPMColor mult_modeproc(SkPMColor src, SkPMColor dst) {
    int a = SkAlphaMulAlpha(SkGetPackedA32(src), SkGetPackedA32(dst));
    int r = SkAlphaMulAlpha(SkGetPackedR32(src), SkGetPackedR32(dst));
    int g = SkAlphaMulAlpha(SkGetPackedG32(src), SkGetPackedG32(dst));
    int b = SkAlphaMulAlpha(SkGetPackedB32(src), SkGetPackedB32(dst));
    return SkPackARGB32(a, r, g, b);
}

DEF_TEST(LumaColorFilter, reporter) {
    SkPMColor in, out;
    auto lf(SkLumaColorFilter::Make());

    // Applying luma to white produces black with the same transparency.
    for (unsigned i = 0; i < 256; ++i) {
        in = SkPackARGB32(i, i, i, i);
        lf->filterSpan(&in, 1, &out);
        REPORTER_ASSERT(reporter, SkGetPackedA32(out) == i);
        REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0);
        REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0);
        REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0);
    }

    // Applying luma to black yields transparent black (luminance(black) == 0)
    for (unsigned i = 0; i < 256; ++i) {
        in = SkPackARGB32(i, 0, 0, 0);
        lf->filterSpan(&in, 1, &out);
        REPORTER_ASSERT(reporter, out == SK_ColorTRANSPARENT);
    }

    // For general colors, a luma filter generates black with an attenuated alpha channel.
    for (unsigned i = 1; i < 256; ++i) {
        in = SkPackARGB32(i, i, i / 2, i / 3);
        lf->filterSpan(&in, 1, &out);
        REPORTER_ASSERT(reporter, out != in);
        REPORTER_ASSERT(reporter, SkGetPackedA32(out) <= i);
        REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0);
        REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0);
        REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0);
    }
}

// kPlus_Mode
static SkPMColor plus_modeproc(SkPMColor src, SkPMColor dst) {
    unsigned b = saturated_add(SkGetPackedB32(src), SkGetPackedB32(dst));
    unsigned g = saturated_add(SkGetPackedG32(src), SkGetPackedG32(dst));
    unsigned r = saturated_add(SkGetPackedR32(src), SkGetPackedR32(dst));
    unsigned a = saturated_add(SkGetPackedA32(src), SkGetPackedA32(dst));
    return SkPackARGB32(a, r, g, b);
}

static SkPMColor screen_modeproc(SkPMColor src, SkPMColor dst) {
    int a = screen_byte(SkGetPackedA32(src), SkGetPackedA32(dst));
    int r = screen_byte(SkGetPackedR32(src), SkGetPackedR32(dst));
    int g = screen_byte(SkGetPackedG32(src), SkGetPackedG32(dst));
    int b = screen_byte(SkGetPackedB32(src), SkGetPackedB32(dst));
    return SkPackARGB32(a, r, g, b);
}

static SkPMColor multiply_modeproc(SkPMColor src, SkPMColor dst) {
    int sa = SkGetPackedA32(src);
    int da = SkGetPackedA32(dst);
    int a = srcover_byte(sa, da);
    int r = blendfunc_multiply_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da);
    int g = blendfunc_multiply_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da);
    int b = blendfunc_multiply_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da);
    return SkPackARGB32(a, r, g, b);
}

static SkPMColor hardlight_modeproc(SkPMColor src, SkPMColor dst) {
    int sa = SkGetPackedA32(src);
    int da = SkGetPackedA32(dst);
    int a = srcover_byte(sa, da);
    int r = hardlight_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da);
    int g = hardlight_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da);
    int b = hardlight_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da);
    return SkPackARGB32(a, r, g, b);
}

static SkPMColor SkFourByteInterp(SkPMColor src, SkPMColor dst, unsigned scale)
{
    unsigned a = SkAlphaBlend(SkGetPackedA32(src), SkGetPackedA32(dst), scale);
    unsigned r = SkAlphaBlend(SkGetPackedR32(src), SkGetPackedR32(dst), scale);
    unsigned g = SkAlphaBlend(SkGetPackedG32(src), SkGetPackedG32(dst), scale);
    unsigned b = SkAlphaBlend(SkGetPackedB32(src), SkGetPackedB32(dst), scale);

    return SkPackARGB32(a, r, g, b);
}

static void boxBlur(const SkPMColor* src, int srcStride, SkPMColor* dst, int kernelSize,
                    int leftOffset, int rightOffset, int width, int height)
{
    int rightBorder = SkMin32(rightOffset + 1, width);
    int srcStrideX = srcDirection == kX ? 1 : srcStride;
    int dstStrideX = dstDirection == kX ? 1 : height;
    int srcStrideY = srcDirection == kX ? srcStride : 1;
    int dstStrideY = dstDirection == kX ? width : 1;
    uint32_t scale = (1 << 24) / kernelSize;
    uint32_t half = 1 << 23;
    for (int y = 0; y < height; ++y) {
        int sumA = 0, sumR = 0, sumG = 0, sumB = 0;
        const SkPMColor* p = src;
        for (int i = 0; i < rightBorder; ++i) {
            sumA += SkGetPackedA32(*p);
            sumR += SkGetPackedR32(*p);
            sumG += SkGetPackedG32(*p);
            sumB += SkGetPackedB32(*p);
            p += srcStrideX;
        }

        const SkPMColor* sptr = src;
        SkColor* dptr = dst;
        for (int x = 0; x < width; ++x) {
            *dptr = SkPackARGB32((sumA * scale + half) >> 24,
                                 (sumR * scale + half) >> 24,
                                 (sumG * scale + half) >> 24,
                                 (sumB * scale + half) >> 24);
            if (x >= leftOffset) {
                SkColor l = *(sptr - leftOffset * srcStrideX);
                sumA -= SkGetPackedA32(l);
                sumR -= SkGetPackedR32(l);
                sumG -= SkGetPackedG32(l);
                sumB -= SkGetPackedB32(l);
            }
            if (x + rightOffset + 1 < width) {
                SkColor r = *(sptr + (rightOffset + 1) * srcStrideX);
                sumA += SkGetPackedA32(r);
                sumR += SkGetPackedR32(r);
                sumG += SkGetPackedG32(r);
                sumB += SkGetPackedB32(r);
            }
            sptr += srcStrideX;
            if (srcDirection == kY) {
                SK_PREFETCH(sptr + (rightOffset + 1) * srcStrideX);
            }
            dptr += dstStrideX;
        }
        src += srcStrideY;
        dst += dstStrideY;
    }
}

//  kDstATop_Mode,  //!< [Sa, Sa * Dc + Sc * (1 - Da)]
static SkPMColor dstatop_modeproc(SkPMColor src, SkPMColor dst) {
    unsigned sa = SkGetPackedA32(src);
    unsigned da = SkGetPackedA32(dst);
    unsigned ida = 255 - da;

    return SkPackARGB32(sa,
                        SkAlphaMulAlpha(ida, SkGetPackedR32(src)) +
                            SkAlphaMulAlpha(sa, SkGetPackedR32(dst)),
                        SkAlphaMulAlpha(ida, SkGetPackedG32(src)) +
                            SkAlphaMulAlpha(sa, SkGetPackedG32(dst)),
                        SkAlphaMulAlpha(ida, SkGetPackedB32(src)) +
                            SkAlphaMulAlpha(sa, SkGetPackedB32(dst)));
}

inline SkPMColor cubicBlend(const SkScalar c[16], SkScalar t, SkPMColor c0, SkPMColor c1, SkPMColor c2, SkPMColor c3) {
    SkScalar t2 = t * t, t3 = t2 * t;
    SkScalar cc[4];
    // FIXME:  For the fractx case, this should be refactored out of this function.
    cc[0] = c[0]  + SkScalarMul(c[1], t) + SkScalarMul(c[2], t2) + SkScalarMul(c[3], t3);
    cc[1] = c[4]  + SkScalarMul(c[5], t) + SkScalarMul(c[6], t2) + SkScalarMul(c[7], t3);
    cc[2] = c[8]  + SkScalarMul(c[9], t) + SkScalarMul(c[10], t2) + SkScalarMul(c[11], t3);
    cc[3] = c[12] + SkScalarMul(c[13], t) + SkScalarMul(c[14], t2) + SkScalarMul(c[15], t3);
    SkScalar a = SkScalarMul(cc[0], SkGetPackedA32(c0)) + SkScalarMul(cc[1], SkGetPackedA32(c1)) + SkScalarMul(cc[2], SkGetPackedA32(c2)) + SkScalarMul(cc[3], SkGetPackedA32(c3));
    SkScalar r = SkScalarMul(cc[0], SkGetPackedR32(c0)) + SkScalarMul(cc[1], SkGetPackedR32(c1)) + SkScalarMul(cc[2], SkGetPackedR32(c2)) + SkScalarMul(cc[3], SkGetPackedR32(c3));
    SkScalar g = SkScalarMul(cc[0], SkGetPackedG32(c0)) + SkScalarMul(cc[1], SkGetPackedG32(c1)) + SkScalarMul(cc[2], SkGetPackedG32(c2)) + SkScalarMul(cc[3], SkGetPackedG32(c3));
    SkScalar b = SkScalarMul(cc[0], SkGetPackedB32(c0)) + SkScalarMul(cc[1], SkGetPackedB32(c1)) + SkScalarMul(cc[2], SkGetPackedB32(c2)) + SkScalarMul(cc[3], SkGetPackedB32(c3));
    return SkPackARGB32(SkScalarRoundToInt(SkScalarClampMax(a, 255)), SkScalarRoundToInt(SkScalarClampMax(r, 255)), SkScalarRoundToInt(SkScalarClampMax(g, 255)), SkScalarRoundToInt(SkScalarClampMax(b, 255)));
}

static SkStream* extract_argb8888_data(const SkBitmap& bitmap,
                                       const SkIRect& srcRect,
                                       bool extractAlpha,
                                       bool* isOpaque,
                                       bool* isTransparent) {
    size_t streamSize = extractAlpha ? srcRect.width() * srcRect.height()
                                     : get_uncompressed_size(bitmap, srcRect);
    SkStream* stream = SkNEW_ARGS(SkMemoryStream, (streamSize));
    uint8_t* dst = (uint8_t*)stream->getMemoryBase();

    const SkUnPreMultiply::Scale* scaleTable = SkUnPreMultiply::GetScaleTable();

    for (int y = srcRect.fTop; y < srcRect.fBottom; y++) {
        uint32_t* src = bitmap.getAddr32(0, y);
        for (int x = srcRect.fLeft; x < srcRect.fRight; x++) {
            SkPMColor c = src[x];
            U8CPU alpha = SkGetPackedA32(c);
            if (extractAlpha) {
                *isOpaque &= alpha == SK_AlphaOPAQUE;
                *isTransparent &= alpha == SK_AlphaTRANSPARENT;
                *dst++ = alpha;
            } else {
                if (SK_AlphaTRANSPARENT == alpha) {
                    // It is necessary to average the color component of
                    // transparent pixels with their surrounding neighbors
                    // since the PDF renderer may separately re-sample the
                    // alpha and color channels when the image is not
                    // displayed at its native resolution. Since an alpha of
                    // zero gives no information about the color component,
                    // the pathological case is a white image with sharp
                    // transparency bounds - the color channel goes to black,
                    // and the should-be-transparent pixels are rendered
                    // as grey because of the separate soft mask and color
                    // resizing.
                    c = get_argb8888_neighbor_avg_color(bitmap, x, y);
                    *dst++ = SkGetPackedR32(c);
                    *dst++ = SkGetPackedG32(c);
                    *dst++ = SkGetPackedB32(c);
                } else {
                    SkUnPreMultiply::Scale s = scaleTable[alpha];
                    *dst++ = SkUnPreMultiply::ApplyScale(s, SkGetPackedR32(c));
                    *dst++ = SkUnPreMultiply::ApplyScale(s, SkGetPackedG32(c));
                    *dst++ = SkUnPreMultiply::ApplyScale(s, SkGetPackedB32(c));
                }
            }
        }
    }
    SkASSERT(dst == streamSize + (uint8_t*)stream->getMemoryBase());
    return stream;
}

static uint8_t compute_666_index(SkPMColor c) {
    int r = SkGetPackedR32(c);
    int g = SkGetPackedG32(c);
    int b = SkGetPackedB32(c);

    return conv_byte_to_6(r) * 36 + conv_byte_to_6(g) * 6 + conv_byte_to_6(b);
}

static SkStream* extract_argb8888_data(const SkBitmap& bitmap,
                                       const SkIRect& srcRect,
                                       bool extractAlpha,
                                       bool* isOpaque,
                                       bool* isTransparent) {
    SkStream* stream;
    if (extractAlpha) {
        stream = SkNEW_ARGS(SkMemoryStream,
                            (srcRect.width() * srcRect.height()));
    } else {
        stream = SkNEW_ARGS(SkMemoryStream,
                            (get_uncompressed_size(bitmap, srcRect)));
    }
    uint8_t* dst = (uint8_t*)stream->getMemoryBase();

    for (int y = srcRect.fTop; y < srcRect.fBottom; y++) {
        uint32_t* src = bitmap.getAddr32(0, y);
        for (int x = srcRect.fLeft; x < srcRect.fRight; x++) {
            if (extractAlpha) {
                dst[0] = SkGetPackedA32(src[x]);
                *isOpaque &= dst[0] == SK_AlphaOPAQUE;
                *isTransparent &= dst[0] == SK_AlphaTRANSPARENT;
                dst++;
            } else {
                dst[0] = SkGetPackedR32(src[x]);
                dst[1] = SkGetPackedG32(src[x]);
                dst[2] = SkGetPackedB32(src[x]);
                dst += 3;
            }
        }
    }
    return stream;
}

static uint8_t compute666Index(SkPMColor c) {
    int r = SkGetPackedR32(c);
    int g = SkGetPackedG32(c);
    int b = SkGetPackedB32(c);

    return convByteTo6(r) * 36 + convByteTo6(g) * 6 + convByteTo6(b);
}

static void pre_dither(const SkBitmap& bm) {
    SkAutoLockPixels alp(bm);
    
    for (int y = 0; y < bm.height(); y++) {
        DITHER_4444_SCAN(y);
        
        SkPMColor* p = bm.getAddr32(0, y);
        for (int x = 0; x < bm.width(); x++) {
            SkPMColor c = *p;
            
            unsigned a = SkGetPackedA32(c);
            unsigned r = SkGetPackedR32(c);
            unsigned g = SkGetPackedG32(c);
            unsigned b = SkGetPackedB32(c);
            
            unsigned d = DITHER_VALUE(x);

            a = SkDITHER_A32To4444(a, d);
            r = SkDITHER_R32To4444(r, d);
            g = SkDITHER_G32To4444(g, d);
            b = SkDITHER_B32To4444(b, d);
            
            a = SkA4444ToA32(a);
            r = SkR4444ToR32(r);
            g = SkG4444ToG32(g);
            b = SkB4444ToB32(b);
            
            *p++ = SkPackARGB32(a, r, g, b);
        }
    }
}