C++ SkGetPackedG32函数代码示例

static void ARGB_8888_To_RGB(const uint8_t* in, uint8_t* rgb, int width,
                             const SkPMColor*) {
    const uint32_t* SK_RESTRICT src = (const uint32_t*)in;
    for (int i = 0; i < width; ++i) {
        const uint32_t c = *src++;
        rgb[0] = SkGetPackedR32(c);
        rgb[1] = SkGetPackedG32(c);
        rgb[2] = SkGetPackedB32(c);
        rgb += 3;
    }
}

static void preMultipliedBGRAtoRGBA(const void* pixels, int pixelCount, unsigned char* output)
{
    static const SkUnPreMultiply::Scale* scale = SkUnPreMultiply::GetScaleTable();
    const SkPMColor* input = static_cast<const SkPMColor*>(pixels);

    for (; pixelCount-- > 0; ++input) {
        const unsigned alpha = SkGetPackedA32(*input);
        if ((alpha != 0) && (alpha != 255)) {
            *output++ = SkUnPreMultiply::ApplyScale(scale[alpha], SkGetPackedR32(*input));
            *output++ = SkUnPreMultiply::ApplyScale(scale[alpha], SkGetPackedG32(*input));
            *output++ = SkUnPreMultiply::ApplyScale(scale[alpha], SkGetPackedB32(*input));
            *output++ = alpha;
        } else {
            *output++ = SkGetPackedR32(*input);
            *output++ = SkGetPackedG32(*input);
            *output++ = SkGetPackedB32(*input);
            *output++ = alpha;
        }
    }
}

static void ToColor_SI8_Opaque(SkColor dst[], const void* src, int width,
                               SkColorTable* ctable) {
    SkASSERT(width > 0);
    const uint8_t* s = (const uint8_t*)src;
    const SkPMColor* colors = ctable->lockColors();
    do {
        SkPMColor c = colors[*s++];
        *dst++ = SkColorSetRGB(SkGetPackedR32(c), SkGetPackedG32(c),
                               SkGetPackedB32(c));
    } while (--width != 0);
    ctable->unlockColors(false);
}

// returns 0..255
static unsigned color_dist32(SkPMColor c, U8CPU r, U8CPU g, U8CPU b)
{
    SkASSERT(r <= 0xFF);
    SkASSERT(g <= 0xFF);
    SkASSERT(b <= 0xFF);

    unsigned dr = SkAbs32(SkGetPackedR32(c) - r);
    unsigned dg = SkAbs32(SkGetPackedG32(c) - g);
    unsigned db = SkAbs32(SkGetPackedB32(c) - b);

    return SkMax32(dr, SkMax32(dg, db));
}

void SkPowerMode::xfer16(uint16_t dst[], const SkPMColor src[], int count,
                         const SkAlpha aa[]) {
    for (int i = 0; i < count; i++) {
        SkPMColor c = src[i];
        int r = SkGetPackedR32(c);
        int g = SkGetPackedG32(c);
        int b = SkGetPackedB32(c);
        r = fTable[r];
        g = fTable[g];
        b = fTable[b];
        dst[i] = SkPack888ToRGB16(r, g, b);
    }
}

static void rgb2yuv_32(uint8_t dst[], SkPMColor c) {
    int r = SkGetPackedR32(c);
    int g = SkGetPackedG32(c);
    int b = SkGetPackedB32(c);

    int  y = ( CYR*r + CYG*g + CYB*b ) >> CSHIFT;
    int  u = ( CUR*r + CUG*g + CUB*b ) >> CSHIFT;
    int  v = ( CVR*r + CVG*g + CVB*b ) >> CSHIFT;

    dst[0] = SkToU8(y);
    dst[1] = SkToU8(u + 128);
    dst[2] = SkToU8(v + 128);
}

static SkPMColor unpremul_pm(SkPMColor c) {
    const U8CPU a = SkGetPackedA32(c);
    if (0 == a) {
        return 0;
    } else if (0xFF == a) {
        return c;
    }
    const unsigned scale = SkUnPreMultiply::GetScale(a);
    return SkPackARGB32NoCheck(a,
                               SkUnPreMultiply::ApplyScale(scale, SkGetPackedR32(c)),
                               SkUnPreMultiply::ApplyScale(scale, SkGetPackedG32(c)),
                               SkUnPreMultiply::ApplyScale(scale, SkGetPackedB32(c)));
}

 static void apply_gamma(const SkBitmap& bm) {
     return; // below is our experiment for sRGB correction
     bm.lockPixels();
     for (int y = 0; y < bm.height(); ++y) {
         for (int x = 0; x < bm.width(); ++x) {
             SkPMColor c = *bm.getAddr32(x, y);
             unsigned r = gamma(SkGetPackedR32(c));
             unsigned g = gamma(SkGetPackedG32(c));
             unsigned b = gamma(SkGetPackedB32(c));
             *bm.getAddr32(x, y) = SkPackARGB32(0xFF, r, g, b);
         }
     }
 }

static void blit_lcd16_opaque(SkPMColor dst[], const uint16_t src[],
                              SkPMColor color, int width) {
    int srcR = SkGetPackedR32(color);
    int srcG = SkGetPackedG32(color);
    int srcB = SkGetPackedB32(color);

    for (int i = 0; i < width; i++) {
        uint16_t mask = src[i];
        if (0 == mask) {
            continue;
        }

        SkPMColor d = dst[i];
        
        /*  We want all of these in 5bits, hence the shifts in case one of them
         *  (green) is 6bits.
         */
        int maskR = SkGetPackedR16(mask) >> (SK_R16_BITS - 5);
        int maskG = SkGetPackedG16(mask) >> (SK_G16_BITS - 5);
        int maskB = SkGetPackedB16(mask) >> (SK_B16_BITS - 5);

        // Now upscale them to 0..256, so we can use SkAlphaBlend
        maskR = upscale31To32(maskR);
        maskG = upscale31To32(maskG);
        maskB = upscale31To32(maskB);

        int maskA = SkMax32(SkMax32(maskR, maskG), maskB);

        int dstA = SkGetPackedA32(d);
        int dstR = SkGetPackedR32(d);
        int dstG = SkGetPackedG32(d);
        int dstB = SkGetPackedB32(d);

        dst[i] = SkPackARGB32(blend32(0xFF, dstA, maskA),
                              blend32(srcR, dstR, maskR),
                              blend32(srcG, dstG, maskG),
                              blend32(srcB, dstB, maskB));
    }
}

static inline bool S32A_D565_Blend_1(SkPMColor sc, uint16_t dc, U8CPU alpha) {
    unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha);
    unsigned dr = (SkMulS16(SkGetPackedR32(sc), alpha) >> 3) + SkMulS16(SkGetPackedR16(dc), dst_scale);
    unsigned dg = (SkMulS16(SkGetPackedG32(sc), alpha) >> 2) + SkMulS16(SkGetPackedG16(dc), dst_scale);

    unsigned rr = SkDiv255Round(dr);
    unsigned rg = SkDiv255Round(dg);

    if (rr <= 31 && rg <= 63) {
        return true;
    }
    return false;
}

static int similarBits(const SkBitmap& gr, const SkBitmap& sk) {
    const int kRowCount = 3;
    const int kThreshold = 3;
    int width = SkTMin(gr.width(), sk.width());
    if (width < kRowCount) {
        return true;
    }
    int height = SkTMin(gr.height(), sk.height());
    if (height < kRowCount) {
        return true;
    }
    int errorTotal = 0;
    SkTArray<char, true> errorRows;
    errorRows.push_back_n(width * kRowCount);
    SkAutoLockPixels autoGr(gr);
    SkAutoLockPixels autoSk(sk);
    char* base = &errorRows[0];
    for (int y = 0; y < height; ++y) {
        SkPMColor* grRow = gr.getAddr32(0, y);
        SkPMColor* skRow = sk.getAddr32(0, y);
        char* cOut = &errorRows[(y % kRowCount) * width];
        for (int x = 0; x < width; ++x) {
            SkPMColor grColor = grRow[x];
            SkPMColor skColor = skRow[x];
            int dr = SkGetPackedR32(grColor) - SkGetPackedR32(skColor);
            int dg = SkGetPackedG32(grColor) - SkGetPackedG32(skColor);
            int db = SkGetPackedB32(grColor) - SkGetPackedB32(skColor);
            int error = SkTMax(SkAbs32(dr), SkTMax(SkAbs32(dg), SkAbs32(db)));
            if ((cOut[x] = error >= kThreshold) && x >= 2
                    && base[x - 2] && base[width + x - 2] && base[width * 2 + x - 2]
                    && base[x - 1] && base[width + x - 1] && base[width * 2 + x - 1]
                    && base[x - 0] && base[width + x - 0] && base[width * 2 + x - 0]) {
                errorTotal += error;
            }
        }
    }
    return errorTotal;
}

bool Image::ConvertToRGBA(Image *nimg,
                          unsigned char *rgba,
                          bool flipY,
                          bool premultiply)
{

    int length;
    int k;
    const unsigned char *pixels;
    int width;

    nimg->m_Image->lockPixels();
    if ((pixels
         = static_cast<const unsigned char *>(nimg->m_Image->getPixels()))
        == NULL) {
        nimg->m_Image->unlockPixels();
        return false;
    }

    width  = nimg->getWidth();
    length = width * nimg->getHeight() * 4;
    width *= 4;
    k = flipY ? length - width : 0;

    for (int i = 0; i < length; i += 4) {
        const uint32_t pixel = *reinterpret_cast<const uint32_t *>(&pixels[i]);
        int alpha            = SkGetPackedA32(pixel);

        if (alpha != 0 && alpha != 255 && !premultiply) {
            SkColor unmultiplied = SkUnPreMultiply::PMColorToColor(pixel);
            rgba[k + 0]          = SkColorGetR(unmultiplied);
            rgba[k + 1]          = SkColorGetG(unmultiplied);
            rgba[k + 2]          = SkColorGetB(unmultiplied);
            rgba[k + 3]          = alpha;
        } else {
            rgba[k + 0] = SkGetPackedR32(pixel);
            rgba[k + 1] = SkGetPackedG32(pixel);
            rgba[k + 2] = SkGetPackedB32(pixel);
            rgba[k + 3] = alpha;
        }

        if (flipY && (i + 4) % width == 0) {
            k = length - (i + 4) - width;
        } else {
            k += 4;
        }
    }

    return true;
}

static void blit_lcd32_opaque(SkPMColor dst[], const uint32_t src[],
                              SkPMColor color, int width) {
    int srcR = SkGetPackedR32(color);
    int srcG = SkGetPackedG32(color);
    int srcB = SkGetPackedB32(color);

    for (int i = 0; i < width; i++) {
        uint32_t mask = src[i];
        if (0 == mask) {
            continue;
        }

        SkPMColor d = dst[i];
        
        int maskR = SkGetPackedR32(mask);
        int maskG = SkGetPackedG32(mask);
        int maskB = SkGetPackedB32(mask);

        // Now upscale them to 0..256, so we can use SkAlphaBlend
        maskR = SkAlpha255To256(maskR);
        maskG = SkAlpha255To256(maskG);
        maskB = SkAlpha255To256(maskB);

        int maskA = SkMax32(SkMax32(maskR, maskG), maskB);

        int dstA = SkGetPackedA32(d);
        int dstR = SkGetPackedR32(d);
        int dstG = SkGetPackedG32(d);
        int dstB = SkGetPackedB32(d);

        dst[i] = SkPackARGB32(SkAlphaBlend(0xFF, dstA, maskA),
                              SkAlphaBlend(srcR, dstR, maskR),
                              SkAlphaBlend(srcG, dstG, maskG),
                              SkAlphaBlend(srcB, dstB, maskB));
    }
}

void SkNormalMapSourceImpl::Provider::fillScanLine(int x, int y, SkPoint3 output[],
                                                   int count) const {
    SkPMColor tmpNormalColors[BUFFER_MAX];

    do {
        int n = SkTMin(count, BUFFER_MAX);

        fMapContext->shadeSpan(x, y, tmpNormalColors, n);

        for (int i = 0; i < n; i++) {
            SkPoint3 tempNorm;

            tempNorm.set(SkIntToScalar(SkGetPackedR32(tmpNormalColors[i])) - 127.0f,
                         SkIntToScalar(SkGetPackedG32(tmpNormalColors[i])) - 127.0f,
                         SkIntToScalar(SkGetPackedB32(tmpNormalColors[i])) - 127.0f);

            tempNorm.normalize();


            if (!SkScalarNearlyEqual(SkScalarAbs(tempNorm.fZ), 1.0f)) {
                SkVector transformed = fSource.fInvCTM.mapVector(tempNorm.fX, tempNorm.fY);

                // Normalizing the transformed X and Y, while keeping constant both Z and the
                // vector's angle in the XY plane. This maintains the "slope" for the surface while
                // appropriately rotating the normal for any anisotropic scaling that occurs.
                // Here, we call scaling factor the number that must divide the transformed X and Y
                // so that the normal's length remains equal to 1.
                SkScalar scalingFactorSquared =
                        (SkScalarSquare(transformed.fX) + SkScalarSquare(transformed.fY))
                        / (1.0f - SkScalarSquare(tempNorm.fZ));
                SkScalar invScalingFactor = SkScalarInvert(SkScalarSqrt(scalingFactorSquared));

                output[i].fX = transformed.fX * invScalingFactor;
                output[i].fY = transformed.fY * invScalingFactor;
                output[i].fZ = tempNorm.fZ;
            } else {
                output[i] = {0.0f, 0.0f, tempNorm.fZ};
                output[i].normalize();
            }

            SkASSERT(SkScalarNearlyEqual(output[i].length(), 1.0f));
        }

        output += n;
        x += n;
        count -= n;
    } while (count > 0);
}

static inline bool S32A_D565_Blend_02(SkPMColor sc, uint16_t dc, U8CPU alpha) {
    unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha);
    unsigned dr = SkMulS16(SkGetPackedR32(sc), alpha) + SkMulS16(GetPackedR16As32(dc), dst_scale);
    unsigned dg = SkMulS16(SkGetPackedG32(sc), alpha) + SkMulS16(GetPackedG16As32(dc), dst_scale);
    unsigned db = SkMulS16(SkGetPackedB32(sc), alpha) + SkMulS16(GetPackedB16As32(dc), dst_scale);
    int rc = SkPack888ToRGB16(SkDiv255Round(dr),
                              SkDiv255Round(dg),
                              SkDiv255Round(db));

    unsigned rr = SkGetPackedR16(rc);
    unsigned rg = SkGetPackedG16(rc);

    if (rr <= 31 && rg <= 63) {
        return true;
    }
    return false;
}