QImage BlurEffect::processImage(const QImage &image, const KoFilterEffectRenderContext &context) const
{
if (m_deviation.x() == 0.0 || m_deviation.y() == 0.0)
return image;
// TODO: take filter region into account
// TODO: blur with different kernels in x and y
// convert from bounding box coordinates
QPointF dev = context.toUserSpace(m_deviation);
// transform to view coordinates
dev = context.viewConverter()->documentToView(dev);
QImage result = image;
fastbluralpha(result, dev.x());
return result;
}
QImage MorphologyEffect::processImage(const QImage &image, const KoFilterEffectRenderContext &context) const
{
QImage result = image;
QPointF radius = context.toUserSpace(m_radius);
const int rx = static_cast<int>(ceil(radius.x()));
const int ry = static_cast<int>(ceil(radius.y()));
const int w = result.width();
const int h = result.height();
// setup mask
const int maskSize = (1+2*rx)*(1+2*ry);
int * mask = new int[maskSize];
int index = 0;
for (int y = -ry; y <= ry; ++y) {
for (int x = -rx; x <= rx; ++x) {
mask[index] = y*w+x;
index++;
}
}
int dstPixel, srcPixel;
uchar s0, s1, s2, s3;
#if QT_VERSION >= 0x040700
const uchar * src = image.constBits();
#else
const uchar * src = image.bits();
#endif
uchar * dst = result.bits();
const QRect roi = context.filterRegion().toRect();
const int minX = qMax(rx, roi.left());
const int maxX = qMin(w-rx, roi.right());
const int minY = qMax(ry, roi.top());
const int maxY = qMin(h-ry, roi.bottom());
const int defValue = m_operator == Erode ? 255 : 0;
uchar * d = 0;
for (int row = minY; row < maxY; ++row) {
for (int col = minX; col < maxX; ++col) {
dstPixel = row * w + col;
s0 = s1 = s2 = s3 = defValue;
for (int i = 0; i < maskSize; ++i) {
srcPixel = dstPixel+mask[i];
const uchar *s = &src[4*srcPixel];
if (m_operator == Erode ) {
s0 = qMin(s0, s[0]);
s1 = qMin(s1, s[1]);
s2 = qMin(s2, s[2]);
s3 = qMin(s3, s[3]);
} else {
s0 = qMax(s0, s[0]);
s1 = qMax(s1, s[1]);
s2 = qMax(s2, s[2]);
s3 = qMax(s3, s[3]);
}
}
d = &dst[4*dstPixel];
d[0] = s0;
d[1] = s1;
d[2] = s2;
d[3] = s3;
}
}
delete [] mask;
return result;
}