Method generateGradientColorTable

src/vector/vdrawhelper.cpp:127–179

};

bool VGradientCache::generateGradientColorTable(const VGradientStops &stops,
                                                float                 opacity,
                                                uint32_t *colorTable, int size)
{
    int                  dist, idist, pos = 0;
    size_t               i;
    bool                 alpha = false;
    size_t               stopCount = stops.size();
    const VGradientStop *curr, *next, *start;
    uint32_t             curColor, nextColor;
    float                delta, t, incr, fpos;

    if (!vCompare(opacity, 1.0f)) alpha = true;

    start = stops.data();
    curr = start;
    if (!curr->second.isOpaque()) alpha = true;
    curColor = curr->second.premulARGB(opacity);
    incr = 1.0f / (float)size;
    fpos = 1.5f * incr;

    colorTable[pos++] = curColor;

    while (fpos <= curr->first) {
        colorTable[pos] = colorTable[pos - 1];
        pos++;
        fpos += incr;
    }

    for (i = 0; i < stopCount - 1; ++i) {
        curr = (start + i);
        next = (start + i + 1);
        delta = 1 / (next->first - curr->first);
        if (!next->second.isOpaque()) alpha = true;
        nextColor = next->second.premulARGB(opacity);
        while (fpos < next->first && pos < size) {
            t = (fpos - curr->first) * delta;
            dist = (int)(255 * t);
            idist = 255 - dist;
            colorTable[pos] =
                interpolate_pixel(curColor, idist, nextColor, dist);
            ++pos;
            fpos += incr;
        }
        curColor = nextColor;
    }

    for (; pos < size; ++pos) colorTable[pos] = curColor;

    // Make sure the last color stop is represented at the end of the table
    colorTable[size - 1] = curColor;
    return alpha;
}

void VRasterBuffer::clear()
{