static bool
checker_ (ImageBuf &dst, Dim3 size,
const float *color1, const float *color2,
Dim3 offset,
ROI roi, int nthreads=1)
{
if (nthreads != 1 && roi.npixels() >= 1000) {
// Lots of pixels and request for multi threads? Parallelize.
ImageBufAlgo::parallel_image (
OIIO::bind(checker_<T>, OIIO::ref(dst),
size, color1, color2, offset,
_1 /*roi*/, 1 /*nthreads*/),
roi, nthreads);
return true;
}
// Serial case
for (ImageBuf::Iterator<T> p (dst, roi); !p.done(); ++p) {
int xtile = (p.x()-offset.x)/size.x; xtile += (p.x()<offset.x);
int ytile = (p.y()-offset.y)/size.y; ytile += (p.y()<offset.y);
int ztile = (p.z()-offset.z)/size.z; ztile += (p.z()<offset.z);
int v = xtile + ytile + ztile;
if (v & 1)
for (int c = roi.chbegin; c < roi.chend; ++c)
p[c] = color2[c];
else
for (int c = roi.chbegin; c < roi.chend; ++c)
p[c] = color1[c];
}
return true;
}
static bool
noise_salt_ (ImageBuf &dst, float saltval, float saltportion, bool mono,
int seed, ROI roi, int nthreads)
{
if (nthreads != 1 && roi.npixels() >= 1000) {
// Lots of pixels and request for multi threads? Parallelize.
ImageBufAlgo::parallel_image (
OIIO::bind(noise_salt_<T>, OIIO::ref(dst),
saltval, saltportion, mono, seed,
_1 /*roi*/, 1 /*nthreads*/),
roi, nthreads);
return true;
}
// Serial case
for (ImageBuf::Iterator<T> p (dst, roi); !p.done(); ++p) {
int x = p.x(), y = p.y(), z = p.z();
float n = 0.0;
for (int c = roi.chbegin; c < roi.chend; ++c) {
if (c == roi.chbegin || !mono)
n = hashrand (x, y, z, c, seed);
if (n < saltportion)
p[c] = saltval;
}
}
return true;
}
static bool
noise_gaussian_ (ImageBuf &dst, float mean, float stddev, bool mono,
int seed, ROI roi, int nthreads)
{
if (nthreads != 1 && roi.npixels() >= 1000) {
// Lots of pixels and request for multi threads? Parallelize.
ImageBufAlgo::parallel_image (
OIIO::bind(noise_gaussian_<T>, OIIO::ref(dst),
mean, stddev, mono, seed,
_1 /*roi*/, 1 /*nthreads*/),
roi, nthreads);
return true;
}
// Serial case
for (ImageBuf::Iterator<T> p (dst, roi); !p.done(); ++p) {
int x = p.x(), y = p.y(), z = p.z();
float n = 0.0;
for (int c = roi.chbegin; c < roi.chend; ++c) {
if (c == roi.chbegin || !mono)
n = mean + stddev * hashnormal (x, y, z, c, seed);
p[c] = p[c] + n;
}
}
return true;
}
static bool
flop_ (ImageBuf &dst, const ImageBuf &src, ROI roi, int nthreads)
{
ImageBuf::ConstIterator<S, D> s (src, roi);
ImageBuf::Iterator<D, D> d (dst, roi);
for ( ; ! d.done(); ++d) {
s.pos (roi.xend-1 - (d.x() - roi.xbegin), d.y(), d.z());
for (int c = roi.chbegin; c < roi.chend; ++c)
d[c] = s[c];
}
return true;
}
static bool
flip_ (ImageBuf &dst, const ImageBuf &src, ROI dst_roi, int nthreads)
{
ROI src_roi_full = src.roi_full();
ROI dst_roi_full = dst.roi_full();
ImageBuf::ConstIterator<S, D> s (src);
ImageBuf::Iterator<D, D> d (dst, dst_roi);
for ( ; ! d.done(); ++d) {
int yy = d.y() - dst_roi_full.ybegin;
s.pos (d.x(), src_roi_full.yend-1 - yy, d.z());
for (int c = dst_roi.chbegin; c < dst_roi.chend; ++c)
d[c] = s[c];
}
return true;
}
static bool
rotate270_ (ImageBuf &dst, const ImageBuf &src, ROI dst_roi, int nthreads)
{
ROI dst_roi_full = dst.roi_full();
ImageBuf::ConstIterator<S, D> s (src);
ImageBuf::Iterator<D, D> d (dst, dst_roi);
for ( ; ! d.done(); ++d) {
s.pos (dst_roi_full.yend - d.y() - 1,
d.x(),
d.z());
for (int c = dst_roi.chbegin; c < dst_roi.chend; ++c)
d[c] = s[c];
}
return true;
}
bool
ImageBufAlgo::make_kernel (ImageBuf &dst, string_view name,
float width, float height, float depth,
bool normalize)
{
int w = std::max (1, (int)ceilf(width));
int h = std::max (1, (int)ceilf(height));
int d = std::max (1, (int)ceilf(depth));
// Round up size to odd
w |= 1;
h |= 1;
d |= 1;
ImageSpec spec (w, h, 1 /*channels*/, TypeDesc::FLOAT);
spec.depth = d;
spec.x = -w/2;
spec.y = -h/2;
spec.z = -d/2;
spec.full_x = spec.x;
spec.full_y = spec.y;
spec.full_z = spec.z;
spec.full_width = spec.width;
spec.full_height = spec.height;
spec.full_depth = spec.depth;
dst.reset (spec);
if (Filter2D *filter = Filter2D::create (name, width, height)) {
// Named continuous filter from filter.h
for (ImageBuf::Iterator<float> p (dst); ! p.done(); ++p)
p[0] = (*filter)((float)p.x(), (float)p.y());
delete filter;
} else if (name == "binomial") {
// Binomial filter
float *wfilter = ALLOCA (float, width);
for (int i = 0; i < width; ++i)
wfilter[i] = binomial (width-1, i);
float *hfilter = (height == width) ? wfilter : ALLOCA (float, height);
if (height != width)
for (int i = 0; i < height; ++i)
hfilter[i] = binomial (height-1, i);
float *dfilter = ALLOCA (float, depth);
if (depth == 1)
dfilter[0] = 1;
else
for (int i = 0; i < depth; ++i)
dfilter[i] = binomial (depth-1, i);
for (ImageBuf::Iterator<float> p (dst); ! p.done(); ++p)
p[0] = wfilter[p.x()-spec.x] * hfilter[p.y()-spec.y] * dfilter[p.z()-spec.z];
} else {
static bool
convolve_ (ImageBuf &dst, const ImageBuf &src, const ImageBuf &kernel,
bool normalize, ROI roi, int nthreads)
{
if (nthreads != 1 && roi.npixels() >= 1000) {
// Lots of pixels and request for multi threads? Parallelize.
ImageBufAlgo::parallel_image (
boost::bind(convolve_<DSTTYPE,SRCTYPE>, boost::ref(dst),
boost::cref(src), boost::cref(kernel), normalize,
_1 /*roi*/, 1 /*nthreads*/),
roi, nthreads);
return true;
}
// Serial case
float scale = 1.0f;
if (normalize) {
scale = 0.0f;
for (ImageBuf::ConstIterator<float> k (kernel); ! k.done(); ++k)
scale += k[0];
scale = 1.0f / scale;
}
float *sum = ALLOCA (float, roi.chend);
ROI kroi = get_roi (kernel.spec());
ImageBuf::Iterator<DSTTYPE> d (dst, roi);
ImageBuf::ConstIterator<SRCTYPE> s (src, roi, ImageBuf::WrapClamp);
for ( ; ! d.done(); ++d) {
for (int c = roi.chbegin; c < roi.chend; ++c)
sum[c] = 0.0f;
for (ImageBuf::ConstIterator<float> k (kernel, kroi); !k.done(); ++k) {
float kval = k[0];
s.pos (d.x() + k.x(), d.y() + k.y(), d.z() + k.z());
for (int c = roi.chbegin; c < roi.chend; ++c)
sum[c] += kval * s[c];
}
for (int c = roi.chbegin; c < roi.chend; ++c)
d[c] = scale * sum[c];
}
return true;
}
static bool
flatten_ (ImageBuf &dst, const ImageBuf &src,
ROI roi, int nthreads)
{
if (nthreads != 1 && roi.npixels() >= 1000) {
// Possible multiple thread case -- recurse via parallel_image
ImageBufAlgo::parallel_image (
boost::bind(flatten_<DSTTYPE>, boost::ref(dst), boost::cref(src),
_1 /*roi*/, 1 /*nthreads*/),
roi, nthreads);
return true;
}
const ImageSpec &srcspec (src.spec());
int nc = srcspec.nchannels;
int alpha_channel, RA_channel, GA_channel, BA_channel;
int R_channel, G_channel, B_channel;
int Z_channel, Zback_channel;
if (! find_deep_channels (srcspec, alpha_channel,
RA_channel, GA_channel, BA_channel,
R_channel, G_channel, B_channel,
Z_channel, Zback_channel)) {
dst.error ("No alpha channel could be identified");
return false;
}
ASSERT (alpha_channel >= 0 ||
(RA_channel >= 0 && GA_channel >= 0 && BA_channel >= 0));
float *val = ALLOCA (float, nc);
float &RAval (RA_channel >= 0 ? val[RA_channel] : val[alpha_channel]);
float &GAval (GA_channel >= 0 ? val[GA_channel] : val[alpha_channel]);
float &BAval (BA_channel >= 0 ? val[BA_channel] : val[alpha_channel]);
for (ImageBuf::Iterator<DSTTYPE> r (dst, roi); !r.done(); ++r) {
int x = r.x(), y = r.y(), z = r.z();
int samps = src.deep_samples (x, y, z);
// Clear accumulated values for this pixel (0 for colors, big for Z)
memset (val, 0, nc*sizeof(float));
if (Z_channel >= 0 && samps == 0)
val[Z_channel] = 1.0e30;
if (Zback_channel >= 0 && samps == 0)
val[Zback_channel] = 1.0e30;
for (int s = 0; s < samps; ++s) {
float RA = RAval, GA = GAval, BA = BAval; // make copies
float alpha = (RA + GA + BA) / 3.0f;
if (alpha >= 1.0f)
break;
for (int c = 0; c < nc; ++c) {
float v = src.deep_value (x, y, z, c, s);
if (c == Z_channel || c == Zback_channel)
val[c] *= alpha; // because Z are not premultiplied
float a;
if (c == R_channel)
a = RA;
else if (c == G_channel)
a = GA;
else if (c == B_channel)
a = BA;
else
a = alpha;
val[c] += (1.0f - a) * v;
}
}
for (int c = roi.chbegin; c < roi.chend; ++c)
r[c] = val[c];
}
return true;
}
