Surface pp::choose(cinder::Surface& imageA, cinder::Surface& imageB, cinder::Surface& errorA, cinder::Surface& secondWeight, float threshold)
{
// for each target pixel find one in source!
float width = std::min(imageA.getWidth(), imageB.getWidth());
float height = std::min(imageB.getHeight(), imageB.getHeight());
Surface result(width, height, false);
ivec2 v(0, 0);
for (v.y = 0; v.y < height; v.y++)
for (v.x = 0; v.x < width; v.x++)
{
// is errorA a local maximum?
bool swap = true;
Color8u eA = errorA.getPixel(v);
float errA = (eA.r-127)*(eA.r-127) + (eA.g-127)*(eA.g-127) + (eA.b-127)*(eA.b-127);
float alternative = secondWeight.getPixel(v).r;
if (std::sqrt(errA)*alternative <= threshold*(3*127*127))
swap = false;
else
for (int i = 0; i < 3 && swap; i++)
for (int j = 0; j < 3 && swap; j++)
if (i != 1 || j != 1)
{
ivec2 offset(i-1, j-1);
Color8u eO = errorA.getPixel(v+offset);
float errOther = (eO.r-127)*(eO.r-127) + (eO.g-127)*(eO.g-127) + (eO.b-127)*(eO.b-127);
if (errOther >= errA)
swap = false;
}
if (swap)
result.setPixel(v, imageB.getPixel(v));
else
result.setPixel(v, imageA.getPixel(v));
}
return result;
}
void pp::getColors(cinder::Surface& source, Palette& result)
{
result.clear();
ivec2 v(0, 0);
int width = source.getWidth();
int height = source.getHeight();
for (v.x = 0; v.x < width; v.x++)
for (v.y = 0; v.y < height; v.y++)
{
Color8u pxl = source.getPixel(v);
bool found = false;
for (Palette::iterator it = result.begin(); it != result.end(); it++)
if (distance2(Color8u(it->r, it->g, it->b), pxl) == 0) // found
found = true;
if (!found)
result.push_back(pxl);
}
}
