static bool
circular_shift_ (ImageBuf &dst, const ImageBuf &src,
int xshift, int yshift, int zshift,
ROI dstroi, ROI roi, int nthreads)
{
if (nthreads != 1 && roi.npixels() >= 1000) {
// Possible multiple thread case -- recurse via parallel_image
ImageBufAlgo::parallel_image (
boost::bind(circular_shift_<DSTTYPE,SRCTYPE>,
boost::ref(dst), boost::cref(src),
xshift, yshift, zshift,
dstroi, _1 /*roi*/, 1 /*nthreads*/),
roi, nthreads);
return true;
}
// Serial case
int width = dstroi.width(), height = dstroi.height(), depth = dstroi.depth();
ImageBuf::ConstIterator<SRCTYPE,DSTTYPE> s (src, roi);
ImageBuf::Iterator<DSTTYPE,DSTTYPE> d (dst);
for ( ; ! s.done(); ++s) {
int dx = s.x() + xshift; OIIO::wrap_periodic (dx, dstroi.xbegin, width);
int dy = s.y() + yshift; OIIO::wrap_periodic (dy, dstroi.ybegin, height);
int dz = s.z() + zshift; OIIO::wrap_periodic (dz, dstroi.zbegin, depth);
d.pos (dx, dy, dz);
if (! d.exists())
continue;
for (int c = roi.chbegin; c < roi.chend; ++c)
d[c] = s[c];
}
return true;
}
static bool
transpose_ (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(transpose_<DSTTYPE,SRCTYPE>,
boost::ref(dst), boost::cref(src),
_1 /*roi*/, 1 /*nthreads*/),
roi, nthreads);
return true;
}
// Serial case
ImageBuf::ConstIterator<SRCTYPE,DSTTYPE> s (src, roi);
ImageBuf::Iterator<DSTTYPE,DSTTYPE> d (dst);
for ( ; ! s.done(); ++s) {
d.pos (s.y(), s.x(), s.z());
if (! d.exists())
continue;
for (int c = roi.chbegin; c < roi.chend; ++c)
d[c] = s[c];
}
return true;
}
static bool
transpose_ (ImageBuf &dst, const ImageBuf &src,
ROI roi, int nthreads)
{
ImageBufAlgo::parallel_image (roi, nthreads, [&](ROI roi){
ImageBuf::ConstIterator<SRCTYPE,DSTTYPE> s (src, roi);
ImageBuf::Iterator<DSTTYPE,DSTTYPE> d (dst);
for ( ; ! s.done(); ++s) {
d.pos (s.y(), s.x(), s.z());
if (! d.exists())
continue;
for (int c = roi.chbegin; c < roi.chend; ++c)
d[c] = s[c];
}
});
return true;
}
bool
ImageBufAlgo::histogram_draw (ImageBuf &R,
const std::vector<imagesize_t> &histogram)
{
// Fail if there are no bins to draw.
int bins = histogram.size();
if (bins == 0) {
R.error ("There are no bins to draw, the histogram is empty");
return false;
}
// Check R and modify it if needed.
int height = R.spec().height;
if (R.spec().format != TypeDesc::TypeFloat || R.nchannels() != 1 ||
R.spec().width != bins) {
ImageSpec newspec = ImageSpec (bins, height, 1, TypeDesc::FLOAT);
R.reset ("dummy", newspec);
}
// Fill output image R with white color.
ImageBuf::Iterator<float, float> r (R);
for ( ; ! r.done(); ++r)
r[0] = 1;
// Draw histogram left->right, bottom->up.
imagesize_t max = *std::max_element (histogram.begin(), histogram.end());
for (int b = 0; b < bins; b++) {
int bin_height = (int) ((float)histogram[b]/(float)max*height + 0.5f);
if (bin_height != 0) {
// Draw one bin at column b.
for (int j = 1; j <= bin_height; j++) {
int row = height - j;
r.pos (b, row);
r[0] = 0;
}
}
}
return true;
}
// DEPRECATED version
bool
ImageBufAlgo::add (ImageBuf &dst, const ImageBuf &A, const ImageBuf &B,
int options)
{
// Sanity checks
// dst must be distinct from A and B
if ((const void *)&A == (const void *)&dst ||
(const void *)&B == (const void *)&dst) {
dst.error ("destination image must be distinct from source");
return false;
}
// all three images must have the same number of channels
if (A.spec().nchannels != B.spec().nchannels) {
dst.error ("channel number mismatch: %d vs. %d",
A.spec().nchannels, B.spec().nchannels);
return false;
}
// If dst has not already been allocated, set it to the right size,
// make it unconditinally float
if (! dst.pixels_valid()) {
ImageSpec dstspec = A.spec();
dstspec.set_format (TypeDesc::TypeFloat);
dst.alloc (dstspec);
}
// Clear dst pixels if instructed to do so
if (options & ADD_CLEAR_DST) {
zero (dst);
}
ASSERT (A.spec().format == TypeDesc::FLOAT &&
B.spec().format == TypeDesc::FLOAT &&
dst.spec().format == TypeDesc::FLOAT);
ImageBuf::ConstIterator<float,float> a (A);
ImageBuf::ConstIterator<float,float> b (B);
ImageBuf::Iterator<float> d (dst);
int nchannels = A.nchannels();
// Loop over all pixels in A
for ( ; a.valid(); ++a) {
// Point the iterators for B and dst to the corresponding pixel
if (options & ADD_RETAIN_WINDOWS) {
b.pos (a.x(), a.y());
} else {
// ADD_ALIGN_WINDOWS: make B line up with A
b.pos (a.x()-A.xbegin()+B.xbegin(), a.y()-A.ybegin()+B.ybegin());
}
d.pos (a.x(), b.y());
if (! b.valid() || ! d.valid())
continue; // Skip pixels that don't align
// Add the pixel
for (int c = 0; c < nchannels; ++c)
d[c] = a[c] + b[c];
}
return true;
}
int
main (int argc, char *argv[])
{
getargs (argc, argv);
std::cout << "Comparing \"" << filenames[0]
<< "\" and \"" << filenames[1] << "\"\n";
// Create a private ImageCache so we can customize its cache size
// and instruct it store everything internally as floats.
ImageCache *imagecache = ImageCache::create (true);
imagecache->attribute ("forcefloat", 1);
if (sizeof(void *) == 4) // 32 bit or 64?
imagecache->attribute ("max_memory_MB", 512.0);
else
imagecache->attribute ("max_memory_MB", 2048.0);
imagecache->attribute ("autotile", 256);
#ifdef DEBUG
imagecache->attribute ("statistics:level", 2);
#endif
ImageBuf img0, img1;
if (! read_input (filenames[0], img0, imagecache) ||
! read_input (filenames[1], img1, imagecache))
return ErrFile;
// ImageSpec spec0 = img0.spec(); // stash it
int ret = ErrOK;
for (int subimage = 0; subimage < img0.nsubimages(); ++subimage) {
if (subimage > 0 && !compareall)
break;
if (subimage >= img1.nsubimages())
break;
if (compareall) {
std::cout << "Subimage " << subimage << ": ";
std::cout << img0.spec().width << " x " << img0.spec().height;
if (img0.spec().depth > 1)
std::cout << " x " << img0.spec().depth;
std::cout << ", " << img0.spec().nchannels << " channel\n";
}
if (! read_input (filenames[0], img0, imagecache, subimage) ||
! read_input (filenames[1], img1, imagecache, subimage))
return ErrFile;
if (img0.nmiplevels() != img1.nmiplevels()) {
std::cout << "Files do not match in their number of MIPmap levels\n";
}
for (int m = 0; m < img0.nmiplevels(); ++m) {
if (m > 0 && !compareall)
break;
if (m > 0 && img0.nmiplevels() != img1.nmiplevels()) {
std::cout << "Files do not match in their number of MIPmap levels\n";
ret = ErrDifferentSize;
break;
}
if (! read_input (filenames[0], img0, imagecache, subimage, m) ||
! read_input (filenames[1], img1, imagecache, subimage, m))
return ErrFile;
if (compareall && img0.nmiplevels() > 1) {
std::cout << " MIP level " << m << ": ";
std::cout << img0.spec().width << " x " << img0.spec().height;
if (img0.spec().depth > 1)
std::cout << " x " << img0.spec().depth;
std::cout << ", " << img0.spec().nchannels << " channel\n";
}
// Compare the dimensions of the images. Fail if they
// aren't the same resolution and number of channels. No
// problem, though, if they aren't the same data type.
if (! same_size (img0, img1)) {
std::cout << "Images do not match in size: ";
std::cout << "(" << img0.spec().width << "x" << img0.spec().height;
if (img0.spec().depth > 1)
std::cout << "x" << img0.spec().depth;
std::cout << "x" << img0.spec().nchannels << ")";
std::cout << " versus ";
std::cout << "(" << img1.spec().width << "x" << img1.spec().height;
if (img1.spec().depth > 1)
std::cout << "x" << img1.spec().depth;
std::cout << "x" << img1.spec().nchannels << ")\n";
ret = ErrDifferentSize;
break;
}
int npels = img0.spec().width * img0.spec().height * img0.spec().depth;
ASSERT (img0.spec().format == TypeDesc::FLOAT);
// Compare the two images.
//
ImageBufAlgo::CompareResults cr;
ImageBufAlgo::compare (img0, img1, failthresh, warnthresh, cr);
int yee_failures = 0;
if (perceptual)
yee_failures = ImageBufAlgo::compare_Yee (img0, img1);
// Print the report
//
std::cout << " Mean error = ";
safe_double_print (cr.meanerror);
std::cout << " RMS error = ";
safe_double_print (cr.rms_error);
std::cout << " Peak SNR = ";
safe_double_print (cr.PSNR);
std::cout << " Max error = " << cr.maxerror;
if (cr.maxerror != 0) {
std::cout << " @ (" << cr.maxx << ", " << cr.maxy;
if (img0.spec().depth > 1)
std::cout << ", " << cr.maxz;
std::cout << ", " << img0.spec().channelnames[cr.maxc] << ')';
}
std::cout << "\n";
// when Visual Studio is used float values in scientific foramt are
// printed with three digit exponent. We change this behaviour to fit
// Linux way
#ifdef _MSC_VER
_set_output_format(_TWO_DIGIT_EXPONENT);
#endif
int precis = std::cout.precision();
std::cout << " " << cr.nwarn << " pixels ("
<< std::setprecision(3) << (100.0*cr.nwarn / npels)
<< std::setprecision(precis) << "%) over " << warnthresh << "\n";
std::cout << " " << cr.nfail << " pixels ("
<< std::setprecision(3) << (100.0*cr.nfail / npels)
<< std::setprecision(precis) << "%) over " << failthresh << "\n";
if (perceptual)
std::cout << " " << yee_failures << " pixels ("
<< std::setprecision(3) << (100.0*yee_failures / npels)
<< std::setprecision(precis)
<< "%) failed the perceptual test\n";
if (cr.nfail > (failpercent/100.0 * npels) || cr.maxerror > hardfail ||
yee_failures > (failpercent/100.0 * npels)) {
ret = ErrFail;
} else if (cr.nwarn > (warnpercent/100.0 * npels) || cr.maxerror > hardwarn) {
if (ret != ErrFail)
ret = ErrWarn;
}
// If the user requested that a difference image be output,
// do that. N.B. we only do this for the first subimage
// right now, because ImageBuf doesn't really know how to
// write subimages.
if (diffimage.size() && (cr.maxerror != 0 || !outdiffonly)) {
ImageBuf diff (diffimage, img0.spec());
ImageBuf::ConstIterator<float,float> pix0 (img0);
ImageBuf::ConstIterator<float,float> pix1 (img1);
ImageBuf::Iterator<float,float> pixdiff (diff);
// Subtract the second image from the first. At which
// time we no longer need the second image, so free it.
if (diffabs) {
for ( ; pix0.valid(); ++pix0) {
pix1.pos (pix0.x(), pix0.y()); // ensure alignment
pixdiff.pos (pix0.x(), pix0.y());
for (int c = 0; c < img0.nchannels(); ++c)
pixdiff[c] = diffscale * fabsf (pix0[c] - pix1[c]);
}
} else {
for ( ; pix0.valid(); ++pix0) {
pix1.pos (pix0.x(), pix0.y()); // ensure alignment
pixdiff.pos (pix0.x(), pix0.y());
for (int c = 0; c < img0.spec().nchannels; ++c)
pixdiff[c] = diffscale * (pix0[c] - pix1[c]);
}
}
diff.save (diffimage);
// Clear diff image name so we only save the first
// non-matching subimage.
diffimage = "";
}
}
}
if (compareall && img0.nsubimages() != img1.nsubimages()) {
std::cout << "Images had differing numbers of subimages ("
<< img0.nsubimages() << " vs " << img1.nsubimages() << ")\n";
ret = ErrFail;
}
if (!compareall && (img0.nsubimages() > 1 || img1.nsubimages() > 1)) {
std::cout << "Only compared the first subimage (of "
<< img0.nsubimages() << " and " << img1.nsubimages()
<< ", respectively)\n";
}
if (ret == ErrOK)
std::cout << "PASS\n";
else if (ret == ErrWarn)
std::cout << "WARNING\n";
else
std::cout << "FAILURE\n";
ImageCache::destroy (imagecache);
return ret;
}
void
IvImage::pixel_transform(bool srgb_to_linear, int color_mode, int select_channel)
{
/// This table obeys the following function:
///
/// unsigned char srgb2linear(unsigned char x)
/// {
/// float x_f = x/255.0;
/// float x_l = 0.0;
/// if (x_f <= 0.04045)
/// x_l = x_f/12.92;
/// else
/// x_l = powf((x_f+0.055)/1.055,2.4);
/// return (unsigned char)(x_l * 255 + 0.5)
/// }
///
/// It's used to transform from sRGB color space to linear color space.
static const unsigned char srgb_to_linear_lut[256] = {
0, 0, 0, 0, 0, 0, 0, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 2, 2, 2, 2, 2, 2,
2, 2, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7,
8, 8, 8, 8, 9, 9, 9, 10,
10, 10, 11, 11, 12, 12, 12, 13,
13, 13, 14, 14, 15, 15, 16, 16,
17, 17, 17, 18, 18, 19, 19, 20,
20, 21, 22, 22, 23, 23, 24, 24,
25, 25, 26, 27, 27, 28, 29, 29,
30, 30, 31, 32, 32, 33, 34, 35,
35, 36, 37, 37, 38, 39, 40, 41,
41, 42, 43, 44, 45, 45, 46, 47,
48, 49, 50, 51, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, 62,
63, 64, 65, 66, 67, 68, 69, 70,
71, 72, 73, 74, 76, 77, 78, 79,
80, 81, 82, 84, 85, 86, 87, 88,
90, 91, 92, 93, 95, 96, 97, 99,
100, 101, 103, 104, 105, 107, 108, 109,
111, 112, 114, 115, 116, 118, 119, 121,
122, 124, 125, 127, 128, 130, 131, 133,
134, 136, 138, 139, 141, 142, 144, 146,
147, 149, 151, 152, 154, 156, 157, 159,
161, 163, 164, 166, 168, 170, 171, 173,
175, 177, 179, 181, 183, 184, 186, 188,
190, 192, 194, 196, 198, 200, 202, 204,
206, 208, 210, 212, 214, 216, 218, 220,
222, 224, 226, 229, 231, 233, 235, 237,
239, 242, 244, 246, 248, 250, 253, 255
};
unsigned char correction_table[256];
int total_channels = spec().nchannels;
int color_channels = spec().nchannels;
int max_channels = m_corrected_image.nchannels();
// FIXME: Now with the iterator and data proxy in place, it should be
// trivial to apply the transformations to any kind of data, not just
// UINT8.
if (spec().format != TypeDesc::UINT8 || ! m_corrected_image.localpixels()) {
return;
}
if (color_channels > 3) {
color_channels = 3;
} else if (color_channels == 2) {
color_channels = 1;
}
// This image is Luminance or Luminance + Alpha, and we are asked to show
// luminance.
if (color_channels == 1 && color_mode == 3) {
color_mode = 0; // Just copy as usual.
}
// Happy path:
if (! srgb_to_linear && color_mode <= 1 && m_gamma == 1.0 && m_exposure == 0.0) {
ImageBuf::ConstIterator<unsigned char, unsigned char> src (*this);
ImageBuf::Iterator<unsigned char, unsigned char> dst (m_corrected_image);
for ( ; src.valid (); ++src) {
dst.pos (src.x(), src.y());
for (int i = 0; i < max_channels; i++)
dst[i] = src[i];
}
return;
}
// fill the correction_table
if (gamma() == 1.0 && exposure() == 0.0) {
for (int pixelvalue = 0; pixelvalue < 256; ++pixelvalue) {
correction_table[pixelvalue] = pixelvalue;
}
} else {
float inv_gamma = 1.0/gamma();
float gain = powf (2.0f, exposure());
for (int pixelvalue = 0; pixelvalue < 256; ++pixelvalue) {
float pv_f = converter (pixelvalue);
pv_f = clamp (calc_exposure (pv_f, gain, inv_gamma),
0.0f, 1.0f);
correction_table[pixelvalue] = (unsigned char) (pv_f*255 + 0.5);
}
}
ImageBuf::ConstIterator<unsigned char, unsigned char> src (*this);
ImageBuf::Iterator<unsigned char, unsigned char> dst (m_corrected_image);
for ( ; src.valid(); ++src) {
dst.pos (src.x(), src.y());
if (color_mode == 0 || color_mode == 1) {
// RGBA, RGB modes.
int ch = 0;
for (ch = 0; ch < color_channels; ch++) {
if (srgb_to_linear)
dst[ch] = correction_table[srgb_to_linear_lut[src[ch]]];
else
dst[ch] = correction_table[src[ch]];
}
for (; ch < max_channels; ch++) {
dst[ch] = src[ch];
}
} else if (color_mode == 3) {
// Convert RGB to luminance, (Rec. 709 luma coefficients).
float luminance;
if (srgb_to_linear) {
luminance = converter (srgb_to_linear_lut[src[0]])*0.2126f +
converter (srgb_to_linear_lut[src[1]])*0.7152f +
converter (srgb_to_linear_lut[src[2]])*0.0722f;
} else {
luminance = converter (src[0])*0.2126f +
converter (src[1])*0.7152f +
converter (src[2])*0.0722f;
}
unsigned char val = (unsigned char) (clamp (luminance, 0.0f, 1.0f) * 255.0 + 0.5);
val = correction_table[val];
dst[0] = val;
dst[1] = val;
dst[2] = val;
// Handle the rest of the channels
for (int ch = 3; ch < total_channels; ++ch) {
dst[ch] = src[ch];
}
} else { // Single channel, heatmap.
unsigned char v = 0;
if (select_channel < color_channels) {
if (srgb_to_linear)
v = correction_table[srgb_to_linear_lut[src[select_channel]]];
else
v = correction_table[src[select_channel]];
} else if (select_channel < total_channels) {
v = src[select_channel];
}
int ch = 0;
for (; ch < color_channels; ++ch) {
dst[ch] = v;
}
for (; ch < max_channels; ++ch) {
dst[ch] = src[ch];
}
}
}
}
int
OiioTool::do_action_diff (ImageRec &ir0, ImageRec &ir1,
Oiiotool &ot)
{
std::cout << "Computing diff of \"" << ir0.name() << "\" vs \""
<< ir1.name() << "\"\n";
ir0.read ();
ir1.read ();
int ret = DiffErrOK;
for (int subimage = 0; subimage < ir0.subimages(); ++subimage) {
if (subimage > 0 && !ot.allsubimages)
break;
if (subimage >= ir1.subimages())
break;
if (ot.allsubimages) {
std::cout << "Subimage " << subimage << ": ";
const ImageSpec &spec (*ir0.spec(subimage));
std::cout << spec.width << " x " << spec.height;
if (spec.depth > 1)
std::cout << " x " << spec.depth;
std::cout << ", " << spec.nchannels << " channel\n";
}
if (ir0.miplevels(subimage) != ir1.miplevels(subimage)) {
std::cout << "Files do not match in their number of MIPmap levels\n";
}
for (int m = 0; m < ir0.miplevels(subimage); ++m) {
if (m > 0 && !ot.allsubimages)
break;
if (m > 0 && ir0.miplevels(subimage) != ir1.miplevels(subimage)) {
std::cout << "Files do not match in their number of MIPmap levels\n";
ret = DiffErrDifferentSize;
break;
}
ImageBuf &img0 (ir0(subimage,m));
ImageBuf &img1 (ir1(subimage,m));
if (ot.allsubimages && ir0.miplevels(subimage) > 1) {
std::cout << " MIP level " << m << ": ";
std::cout << img0.spec().width << " x " << img0.spec().height;
if (img0.spec().depth > 1)
std::cout << " x " << img0.spec().depth;
std::cout << ", " << img0.spec().nchannels << " channel\n";
}
// Compare the dimensions of the images. Fail if they
// aren't the same resolution and number of channels. No
// problem, though, if they aren't the same data type.
if (! same_size (img0, img1)) {
std::cout << "Images do not match in size: ";
std::cout << "(" << img0.spec().width << "x" << img0.spec().height;
if (img0.spec().depth > 1)
std::cout << "x" << img0.spec().depth;
std::cout << "x" << img0.spec().nchannels << ")";
std::cout << " versus ";
std::cout << "(" << img1.spec().width << "x" << img1.spec().height;
if (img1.spec().depth > 1)
std::cout << "x" << img1.spec().depth;
std::cout << "x" << img1.spec().nchannels << ")\n";
ret = DiffErrDifferentSize;
break;
}
int npels = img0.spec().width * img0.spec().height * img0.spec().depth;
ASSERT (img0.spec().format == TypeDesc::FLOAT);
// Compare the two images.
//
ImageBufAlgo::CompareResults cr;
ImageBufAlgo::compare (img0, img1, ot.diff_failthresh, ot.diff_warnthresh, cr);
int yee_failures = 0;
#if 0
if (perceptual)
yee_failures = ImageBufAlgo::compare_Yee (img0, img1);
#endif
// Print the report
//
std::cout << " Mean error = ";
safe_double_print (cr.meanerror);
std::cout << " RMS error = ";
safe_double_print (cr.rms_error);
std::cout << " Peak SNR = ";
safe_double_print (cr.PSNR);
std::cout << " Max error = " << cr.maxerror;
if (cr.maxerror != 0) {
std::cout << " @ (" << cr.maxx << ", " << cr.maxy;
if (img0.spec().depth > 1)
std::cout << ", " << cr.maxz;
std::cout << ", " << img0.spec().channelnames[cr.maxc] << ')';
}
std::cout << "\n";
// when Visual Studio is used float values in scientific foramt are
// printed with three digit exponent. We change this behaviour to fit
// Linux way
#ifdef _MSC_VER
_set_output_format(_TWO_DIGIT_EXPONENT);
#endif
int precis = std::cout.precision();
std::cout << " " << cr.nwarn << " pixels ("
<< std::setprecision(3) << (100.0*cr.nwarn / npels)
<< std::setprecision(precis) << "%) over " << ot.diff_warnthresh << "\n";
std::cout << " " << cr.nfail << " pixels ("
<< std::setprecision(3) << (100.0*cr.nfail / npels)
<< std::setprecision(precis) << "%) over " << ot.diff_failthresh << "\n";
#if 0
if (perceptual)
std::cout << " " << yee_failures << " pixels ("
<< std::setprecision(3) << (100.0*yee_failures / npels)
<< std::setprecision(precis)
<< "%) failed the perceptual test\n";
#endif
if (cr.nfail > (ot.diff_failpercent/100.0 * npels) || cr.maxerror > ot.diff_hardfail ||
yee_failures > (ot.diff_failpercent/100.0 * npels)) {
ret = DiffErrFail;
} else if (cr.nwarn > (ot.diff_warnpercent/100.0 * npels) || cr.maxerror > ot.diff_hardwarn) {
if (ret != DiffErrFail)
ret = DiffErrWarn;
}
#if 0
// If the user requested that a difference image be output,
// do that. N.B. we only do this for the first subimage
// right now, because ImageBuf doesn't really know how to
// write subimages.
if (diffimage.size() && (cr.maxerror != 0 || !outdiffonly)) {
ImageBuf diff (diffimage, img0.spec());
ImageBuf::ConstIterator<float,float> pix0 (img0);
ImageBuf::ConstIterator<float,float> pix1 (img1);
ImageBuf::Iterator<float,float> pixdiff (diff);
// Subtract the second image from the first. At which
// time we no longer need the second image, so free it.
if (diffabs) {
for ( ; pix0.valid(); ++pix0) {
pix1.pos (pix0.x(), pix0.y()); // ensure alignment
pixdiff.pos (pix0.x(), pix0.y());
for (int c = 0; c < img0.nchannels(); ++c)
pixdiff[c] = diffscale * fabsf (pix0[c] - pix1[c]);
}
} else {
for ( ; pix0.valid(); ++pix0) {
pix1.pos (pix0.x(), pix0.y()); // ensure alignment
pixdiff.pos (pix0.x(), pix0.y());
for (int c = 0; c < img0.spec().nchannels; ++c)
pixdiff[c] = diffscale * (pix0[c] - pix1[c]);
}
}
diff.save (diffimage);
// Clear diff image name so we only save the first
// non-matching subimage.
diffimage = "";
}
#endif
}
}
if (ot.allsubimages && ir0.subimages() != ir1.subimages()) {
std::cout << "Images had differing numbers of subimages ("
<< ir0.subimages() << " vs " << ir1.subimages() << ")\n";
ret = DiffErrFail;
}
if (!ot.allsubimages && (ir0.subimages() > 1 || ir1.subimages() > 1)) {
std::cout << "Only compared the first subimage (of "
<< ir0.subimages() << " and " << ir1.subimages()
<< ", respectively)\n";
}
if (ret == DiffErrOK)
std::cout << "PASS\n";
else if (ret == DiffErrWarn)
std::cout << "WARNING\n";
else {
std::cout << "FAILURE\n";
}
return ret;
}