76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
#include <vips/vips8>
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#include "common.h"
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using namespace std;
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using namespace vips;
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char *Swirl(string *type, char *BufferData, size_t BufferLength,
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ArgumentMap Arguments, size_t *DataSize) {
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VOption *options = VImage::option()->set("access", "sequential");
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VImage in =
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VImage::new_from_buffer(BufferData, BufferLength, "",
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*type == "gif" ? options->set("n", -1) : options)
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.colourspace(VIPS_INTERPRETATION_sRGB);
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if (!in.has_alpha()) in = in.bandjoin(255);
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int pageHeight = vips_image_get_page_height(in.get_image());
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int nPages = vips_image_get_n_pages(in.get_image());
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int width = in.width();
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double newWidth = width * 3;
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double newHeight = pageHeight * 3;
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vector<double> divSize = {newWidth / 2, newHeight / 2};
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VImage index = VImage::xyz(newWidth, newHeight);
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VImage center = index - divSize;
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VImage polar = center
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.copy(VImage::option()
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->set("format", VIPS_FORMAT_COMPLEX)
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->set("bands", 1))
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.polar()
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.copy(VImage::option()
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->set("format", VIPS_FORMAT_FLOAT)
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->set("bands", 2));
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int size = min(width, pageHeight) / 2;
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VImage test = (1 - polar.extract_band(0) / size);
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VImage degrees = test.cast(VIPS_FORMAT_FLOAT).pow(2);
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VImage angle = polar.extract_band(1) + degrees * 180;
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VImage distortion = polar.extract_band(0)
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.bandjoin(angle)
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.copy(VImage::option()
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->set("format", VIPS_FORMAT_COMPLEX)
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->set("bands", 1))
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.rect()
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.copy(VImage::option()
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->set("format", VIPS_FORMAT_FLOAT)
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->set("bands", 2)) +
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divSize;
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vector<VImage> img;
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for (int i = 0; i < nPages; i++) {
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VImage img_frame =
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*type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
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VImage distort =
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img_frame
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.gravity(VIPS_COMPASS_DIRECTION_CENTRE, newWidth, newHeight,
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VImage::option()->set("extend", VIPS_EXTEND_COPY))
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.mapim(distortion,
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VImage::option()->set(
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"interpolate", VInterpolate::new_from_name("bicubic")));
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VImage frame = distort.crop(width, pageHeight, width, pageHeight);
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img.push_back(frame);
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}
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VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
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final.set(VIPS_META_PAGE_HEIGHT, pageHeight);
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void *buf;
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final.write_to_buffer(".gif", &buf, DataSize);
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return (char *)buf;
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} |