C++ IBAprep函数代码示例

bool
ImageBufAlgo::sub(ImageBuf& dst, Image_or_Const A_, Image_or_Const B_, ROI roi,
                  int nthreads)
{
    pvt::LoggedTimer logtime("IBA::sub");
    if (A_.is_img() && B_.is_img()) {
        const ImageBuf &A(A_.img()), &B(B_.img());
        if (!IBAprep(roi, &dst, &A, &B))
            return false;
        ROI origroi = roi;
        roi.chend = std::min(roi.chend, std::min(A.nchannels(), B.nchannels()));
        bool ok;
        OIIO_DISPATCH_COMMON_TYPES3(ok, "sub", sub_impl, dst.spec().format,
                                    A.spec().format, B.spec().format, dst, A, B,
                                    roi, nthreads);
        if (roi.chend < origroi.chend && A.nchannels() != B.nchannels()) {
            // Edge case: A and B differed in nchannels, we allocated dst to be
            // the bigger of them, but adjusted roi to be the lesser. Now handle
            // the channels that got left out because they were not common to
            // all the inputs.
            ASSERT(roi.chend <= dst.nchannels());
            roi.chbegin = roi.chend;
            roi.chend   = origroi.chend;
            if (A.nchannels() > B.nchannels()) {  // A exists
                copy(dst, A, dst.spec().format, roi, nthreads);
            } else {  // B exists
                copy(dst, B, dst.spec().format, roi, nthreads);
            }
        }
        return ok;
    }
    if (A_.is_val() && B_.is_img())  // canonicalize to A_img, B_val
        A_.swap(B_);
    if (A_.is_img() && B_.is_val()) {
        const ImageBuf& A(A_.img());
        cspan<float> b = B_.val();
        if (!IBAprep(roi, &dst, &A,
                     IBAprep_CLAMP_MUTUAL_NCHANNELS | IBAprep_SUPPORT_DEEP))
            return false;
        IBA_FIX_PERCHAN_LEN_DEF(b, A.nchannels());
        // Negate b (into a copy)
        int nc      = A.nchannels();
        float* vals = ALLOCA(float, nc);
        for (int c = 0; c < nc; ++c)
            vals[c] = -b[c];
        b = cspan<float>(vals, nc);
        if (dst.deep()) {
            // While still serial, set up all the sample counts
            dst.deepdata()->set_all_samples(A.deepdata()->all_samples());
            return add_impl_deep(dst, A, b, roi, nthreads);
        }
        bool ok;
        OIIO_DISPATCH_COMMON_TYPES2(ok, "sub", add_impl, dst.spec().format,
                                    A.spec().format, dst, A, b, roi, nthreads);
        return ok;
    }
    // Remaining cases: error
    dst.error("ImageBufAlgo::sub(): at least one argument must be an image");
    return false;
}

bool
ImageBufAlgo::absdiff (ImageBuf &dst, const ImageBuf &A, const ImageBuf &B,
                       ROI roi, int nthreads)
{
    if (! IBAprep (roi, &dst, &A, &B))
        return false;
    ROI origroi = roi;
    roi.chend = std::min (roi.chend, std::min (A.nchannels(), B.nchannels()));
    bool ok;
    OIIO_DISPATCH_COMMON_TYPES3 (ok, "absdiff", absdiff_impl, dst.spec().format,
                                 A.spec().format, B.spec().format,
                                 dst, A, B, roi, nthreads);

    if (roi.chend < origroi.chend && A.nchannels() != B.nchannels()) {
        // Edge case: A and B differed in nchannels, we allocated dst to be
        // the bigger of them, but adjusted roi to be the lesser. Now handle
        // the channels that got left out because they were not common to
        // all the inputs.
        ASSERT (roi.chend <= dst.nchannels());
        roi.chbegin = roi.chend;
        roi.chend = origroi.chend;
        if (A.nchannels() > B.nchannels()) { // A exists
            abs (dst, A, roi, nthreads);
        } else { // B exists
            abs (dst, B, roi, nthreads);
        }
    }
    return ok;
}

bool
ImageBufAlgo::rotate180 (ImageBuf &dst, const ImageBuf &src,
                         ROI roi, int nthreads)
{
    if (&dst == &src) {    // Handle in-place operation
        ImageBuf tmp;
        tmp.swap (const_cast<ImageBuf&>(src));
        return rotate180 (dst, tmp, roi, nthreads);
    }

    ROI src_roi = roi.defined() ? roi : src.roi();
    ROI src_roi_full = src.roi_full();
    int xoffset = src_roi.xbegin - src_roi_full.xbegin;
    int xstart = src_roi_full.xend - xoffset - src_roi.width();
    int yoffset = src_roi.ybegin - src_roi_full.ybegin;
    int ystart = src_roi_full.yend - yoffset - src_roi.height();
    ROI dst_roi (xstart, xstart+src_roi.width(),
                 ystart, ystart+src_roi.height(),
                 src_roi.zbegin, src_roi.zend,
                 src_roi.chbegin, src_roi.chend);
    ASSERT (dst_roi.width() == src_roi.width() &&
            dst_roi.height() == src_roi.height());

    // Compute the destination ROI, it's the source ROI reflected across
    // the midline of the display window.
    IBAprep (dst_roi, &dst, &src);
    bool ok;
    OIIO_DISPATCH_TYPES2 (ok, "rotate180", rotate180_,
                          dst.spec().format, src.spec().format,
                          dst, src, dst_roi, nthreads);
    return ok;
}

bool
ImageBufAlgo::transpose (ImageBuf &dst, const ImageBuf &src,
                         ROI roi, int nthreads)
{
    pvt::LoggedTimer logtime("IBA::transpose");
    if (! roi.defined())
        roi = get_roi (src.spec());
    roi.chend = std::min (roi.chend, src.nchannels());
    ROI dst_roi (roi.ybegin, roi.yend, roi.xbegin, roi.xend,
                 roi.zbegin, roi.zend, roi.chbegin, roi.chend);
    bool dst_initialized = dst.initialized();
    if (! IBAprep (dst_roi, &dst))
        return false;
    if (! dst_initialized) {
        ROI r = src.roi_full();
        ROI dst_roi_full (r.ybegin, r.yend, r.xbegin, r.xend,
                          r.zbegin, r.zend, r.chbegin, r.chend);
        dst.set_roi_full (dst_roi_full);
    }
    bool ok;
    if (dst.spec().format == src.spec().format) {
        OIIO_DISPATCH_TYPES (ok, "transpose", transpose_, dst.spec().format,
                             dst, src, roi, nthreads);
    } else {
        OIIO_DISPATCH_COMMON_TYPES2 (ok, "transpose", transpose_, dst.spec().format,
                              src.spec().format, dst, src, roi, nthreads);
    }
    return ok;
}

bool
ImageBufAlgo::colorconvert (ImageBuf &dst, const ImageBuf &src,
                            const ColorProcessor* processor, bool unpremult,
                            ROI roi, int nthreads)
{
    // If the processor is NULL, return false (error)
    if (!processor) {
        dst.error ("Passed NULL ColorProcessor to colorconvert() [probable application bug]");
        return false;
    }

    // If the processor is a no-op and the conversion is being done
    // in place, no work needs to be done. Early exit.
    if (processor->isNoOp() && (&dst == &src))
        return true;

    if (! IBAprep (roi, &dst, &src))
        return false;

    // If the processor is a no-op (and it's not an in-place conversion),
    // use paste() to simplify the operation.
    if (processor->isNoOp()) {
        roi.chend = std::max (roi.chbegin+4, roi.chend);
        return ImageBufAlgo::paste (dst, roi.xbegin, roi.ybegin, roi.zbegin,
                                    roi.chbegin, src, roi, nthreads);
    }

    bool ok = true;
    OIIO_DISPATCH_COMMON_TYPES2 (ok, "colorconvert", colorconvert_impl,
                                 dst.spec().format, src.spec().format,
                                 dst, src, processor, unpremult, roi, nthreads);
    return ok;
}

bool
ImageBufAlgo::flip(ImageBuf &dst, const ImageBuf &src, ROI roi, int nthreads)
{
    if (&dst == &src) {    // Handle in-place operation
        ImageBuf tmp;
        tmp.swap (const_cast<ImageBuf&>(src));
        return flip (dst, tmp, roi, nthreads);
    }
    pvt::LoggedTimer logtime("IBA::flip");

    ROI src_roi = roi.defined() ? roi : src.roi();
    ROI src_roi_full = src.roi_full();
    int offset = src_roi.ybegin - src_roi_full.ybegin;
    int start = src_roi_full.yend - offset - src_roi.height();
    ROI dst_roi (src_roi.xbegin, src_roi.xend,
                 start, start+src_roi.height(),
                 src_roi.zbegin, src_roi.zend,
                 src_roi.chbegin, src_roi.chend);
    ASSERT (dst_roi.width() == src_roi.width() &&
            dst_roi.height() == src_roi.height());

    // Compute the destination ROI, it's the source ROI reflected across
    // the midline of the display window.
    if (! IBAprep (dst_roi, &dst, &src))
        return false;
    bool ok;
    OIIO_DISPATCH_COMMON_TYPES2 (ok, "flip", flip_,
                          dst.spec().format, src.spec().format,
                          dst, src, dst_roi, nthreads);
    return ok;
}

bool
ImageBufAlgo::mul (ImageBuf &dst, const float *val, ROI roi, int nthreads)
{
    IBAprep (roi, &dst);
    OIIO_DISPATCH_TYPES ("mul", mul_impl, dst.spec().format,
                         dst, val, roi, nthreads);
    return true;
}

bool
ImageBufAlgo::div(ImageBuf& dst, Image_or_Const A_, Image_or_Const B_, ROI roi,
                  int nthreads)
{
    pvt::LoggedTimer logtime("IBA::div");
    if (A_.is_img() && B_.is_img()) {
        const ImageBuf &A(A_.img()), &B(B_.img());
        if (!IBAprep(roi, &dst, &A, &B, IBAprep_CLAMP_MUTUAL_NCHANNELS))
            return false;
        bool ok;
        OIIO_DISPATCH_COMMON_TYPES3(ok, "div", div_impl, dst.spec().format,
                                    A.spec().format, B.spec().format, dst, A, B,
                                    roi, nthreads);
        return ok;
    }
    if (A_.is_val() && B_.is_img())  // canonicalize to A_img, B_val
        A_.swap(B_);
    if (A_.is_img() && B_.is_val()) {
        const ImageBuf& A(A_.img());
        cspan<float> b = B_.val();
        if (!IBAprep(roi, &dst, &A,
                     IBAprep_CLAMP_MUTUAL_NCHANNELS | IBAprep_SUPPORT_DEEP))
            return false;

        IBA_FIX_PERCHAN_LEN_DEF(b, dst.nchannels());
        int nc      = dst.nchannels();
        float* binv = OIIO_ALLOCA(float, nc);
        for (int c = 0; c < nc; ++c)
            binv[c] = (b[c] == 0.0f) ? 0.0f : 1.0f / b[c];
        b = cspan<float>(binv, nc);  // re-wrap

        if (dst.deep()) {
            // While still serial, set up all the sample counts
            dst.deepdata()->set_all_samples(A.deepdata()->all_samples());
            return mul_impl_deep(dst, A, b, roi, nthreads);
        }
        bool ok;
        OIIO_DISPATCH_COMMON_TYPES2(ok, "div", mul_impl, dst.spec().format,
                                    A.spec().format, dst, A, b, roi, nthreads);
        return ok;
    }
    // Remaining cases: error
    dst.error("ImageBufAlgo::div(): at least one argument must be an image");
    return false;
}

bool
ImageBufAlgo::flop (ImageBuf &dst, const ImageBuf &src, ROI roi, int nthreads)
{
    IBAprep (roi, &dst);
    OIIO_DISPATCH_TYPES2 ("flop", flop_,
                          dst.spec().format, src.spec().format, dst, src,
                          roi, nthreads);
    return false;
}

bool
ImageBufAlgo::zero (ImageBuf &dst, ROI roi, int nthreads)
{
    if (! IBAprep (roi, &dst))
        return false;
    float *zero = ALLOCA(float,roi.chend);
    memset (zero, 0, roi.chend*sizeof(float));
    return fill (dst, zero, roi, nthreads);
}

bool
ImageBufAlgo::mul (ImageBuf &dst, const ImageBuf &A, const float *b,
                   ROI roi, int nthreads)
{
    if (! IBAprep (roi, &dst, &A))
        return false;
    OIIO_DISPATCH_TYPES2 ("mul", mul_impl, dst.spec().format,
                          A.spec().format, dst, A, b, roi, nthreads);
    return true;
}

bool
ImageBufAlgo::fill (ImageBuf &dst, const float *pixel, ROI roi, int nthreads)
{
    ASSERT (pixel && "fill must have a non-NULL pixel value pointer");
    if (! IBAprep (roi, &dst))
        return false;
    OIIO_DISPATCH_TYPES ("fill", fill_, dst.spec().format,
                         dst, pixel, roi, nthreads);
    return true;
}

bool
ImageBufAlgo::resize (ImageBuf &dst, const ImageBuf &src,
                      const std::string &filtername_, float fwidth,
                      ROI roi, int nthreads)
{
    if (! IBAprep (roi, &dst, &src))
        return false;
    const ImageSpec &srcspec (src.spec());
    const ImageSpec &dstspec (dst.spec());
    if (dstspec.nchannels != srcspec.nchannels) {
        dst.error ("channel number mismatch: %d vs. %d", 
                   dst.spec().nchannels, src.spec().nchannels);
        return false;
    }
    if (dstspec.depth > 1 || srcspec.depth > 1) {
        dst.error ("ImageBufAlgo::resize does not support volume images");
        return false;
    }

    // Resize ratios
    float wratio = float(dstspec.full_width) / float(srcspec.full_width);
    float hratio = float(dstspec.full_height) / float(srcspec.full_height);

    // Set up a shared pointer with custom deleter to make sure any
    // filter we allocate here is properly destroyed.
    boost::shared_ptr<Filter2D> filter ((Filter2D*)NULL, Filter2D::destroy);
    std::string filtername = filtername_;
    if (filtername.empty()) {
        // No filter name supplied -- pick a good default
        if (wratio > 1.0f || hratio > 1.0f)
            filtername = "blackman-harris";
        else
            filtername = "lanczos3";
    }
    for (int i = 0, e = Filter2D::num_filters();  i < e;  ++i) {
        FilterDesc fd;
        Filter2D::get_filterdesc (i, &fd);
        if (fd.name == filtername) {
            float w = fwidth > 0.0f ? fwidth : fd.width * std::max (1.0f, wratio);
            float h = fwidth > 0.0f ? fwidth : fd.width * std::max (1.0f, hratio);
            filter.reset (Filter2D::create (filtername, w, h));
            break;
        }
    }
    if (! filter) {
        dst.error ("Filter \"%s\" not recognized", filtername);
        return false;
    }

    OIIO_DISPATCH_TYPES2 ("resize", resize_,
                          dstspec.format, srcspec.format,
                          dst, src, filter.get(), roi, nthreads);

    return false;
}

bool
ImageBufAlgo::circular_shift (ImageBuf &dst, const ImageBuf &src,
                              int xshift, int yshift, int zshift,
                              ROI roi, int nthreads)
{
    IBAprep (roi, &dst, &src);
    OIIO_DISPATCH_TYPES2 ("circular_shift", circular_shift_,
                          dst.spec().format, src.spec().format, dst, src,
                          xshift, yshift, zshift, roi, roi, nthreads);
    return false;
}

bool
ImageBufAlgo::mul (ImageBuf &dst, const ImageBuf &A, const float *b,
                   ROI roi, int nthreads)
{
    if (! IBAprep (roi, &dst, &A, IBAprep_CLAMP_MUTUAL_NCHANNELS))
        return false;
    bool ok;
    OIIO_DISPATCH_COMMON_TYPES2 (ok, "mul", mul_impl, dst.spec().format,
                          A.spec().format, dst, A, b, roi, nthreads);
    return ok;
}