C++ (Cpp) SkGetPackedG4444 Examples

Example #1

File: SkPDFImage.cpp Project: Igalia/skia

static SkStream* extract_argb4444_data(const SkBitmap& bitmap,
                                       const SkIRect& srcRect,
                                       bool extractAlpha,
                                       bool* isOpaque,
                                       bool* isTransparent) {
    SkStream* stream;
    uint8_t* dst = NULL;
    if (extractAlpha) {
        const int alphaRowBytes = (srcRect.width() + 1) / 2;
        stream = SkNEW_ARGS(SkMemoryStream,
                            (alphaRowBytes * srcRect.height()));
    } else {
        stream = SkNEW_ARGS(SkMemoryStream,
                            (get_uncompressed_size(bitmap, srcRect)));
    }
    dst = (uint8_t*)stream->getMemoryBase();

    for (int y = srcRect.fTop; y < srcRect.fBottom; y++) {
        uint16_t* src = bitmap.getAddr16(0, y);
        int x;
        for (x = srcRect.fLeft; x + 1 < srcRect.fRight; x += 2) {
            if (extractAlpha) {
                dst[0] = (SkGetPackedA4444(src[x]) << 4) |
                    SkGetPackedA4444(src[x + 1]);
                *isOpaque &= dst[0] == SK_AlphaOPAQUE;
                *isTransparent &= dst[0] == SK_AlphaTRANSPARENT;
                dst++;
            } else {
                dst[0] = (SkGetPackedR4444(src[x]) << 4) |
                    SkGetPackedG4444(src[x]);
                dst[1] = (SkGetPackedB4444(src[x]) << 4) |
                    SkGetPackedR4444(src[x + 1]);
                dst[2] = (SkGetPackedG4444(src[x + 1]) << 4) |
                    SkGetPackedB4444(src[x + 1]);
                dst += 3;
            }
        }
        if (srcRect.width() & 1) {
            if (extractAlpha) {
                dst[0] = (SkGetPackedA4444(src[x]) << 4);
                *isOpaque &= dst[0] == (SK_AlphaOPAQUE & 0xF0);
                *isTransparent &= dst[0] == (SK_AlphaTRANSPARENT & 0xF0);
                dst++;

            } else {
                dst[0] = (SkGetPackedR4444(src[x]) << 4) |
                    SkGetPackedG4444(src[x]);
                dst[1] = (SkGetPackedB4444(src[x]) << 4);
                dst += 2;
            }
        }
    }
    return stream;
}

Example #2

File: SkPDFImage.cpp Project: Igalia/skia

static uint16_t get_argb4444_neighbor_avg_color(const SkBitmap& bitmap,
                                                int xOrig, int yOrig) {
    uint8_t count = 0;
    uint8_t r = 0;
    uint8_t g = 0;
    uint8_t b = 0;

    for (int y = yOrig - 1; y <= yOrig + 1; y++) {
        if (y < 0 || y >= bitmap.height()) {
            continue;
        }
        uint16_t* src = bitmap.getAddr16(0, y);
        for (int x = xOrig - 1; x <= xOrig + 1; x++) {
            if (x < 0 || x >= bitmap.width()) {
                continue;
            }
            if ((SkGetPackedA4444(src[x]) & 0x0F) != SK_AlphaTRANSPARENT) {
                uint16_t color = remove_alpha_argb4444(src[x]);
                r += SkGetPackedR4444(color);
                g += SkGetPackedG4444(color);
                b += SkGetPackedB4444(color);
                count++;
            }
        }
    }

    if (count == 0) {
        return SkPackARGB4444(SK_AlphaOPAQUE & 0x0F, 0, 0, 0);
    } else {
        return SkPackARGB4444(SK_AlphaOPAQUE & 0x0F,
                                   r / count, g / count, b / count);
    }
}

Example #3

File: SkAvoidXfermode.cpp Project: ACSOP/android_external_skia

// returns 0..15
static unsigned color_dist4444(uint16_t c, unsigned r, unsigned g, unsigned b)
{
    SkASSERT(r <= 0xF);
    SkASSERT(g <= 0xF);
    SkASSERT(b <= 0xF);

    unsigned dr = SkAbs32(SkGetPackedR4444(c) - r);
    unsigned dg = SkAbs32(SkGetPackedG4444(c) - g);
    unsigned db = SkAbs32(SkGetPackedB4444(c) - b);

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

Example #4

File: SkImageDecoder_libjpeg.cpp Project: Primalmod/platform_external_skia

static void rgb2yuv_4444(uint8_t dst[], U16CPU c) {
    int r = SkGetPackedR4444(c);
    int g = SkGetPackedG4444(c);
    int b = SkGetPackedB4444(c);

    int  y = ( CYR*r + CYG*g + CYB*b ) >> (CSHIFT - 4);
    int  u = ( CUR*r + CUG*g + CUB*b ) >> (CSHIFT - 4);
    int  v = ( CVR*r + CVG*g + CVB*b ) >> (CSHIFT - 4);

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