50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
#include <math.h>
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#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 *Bounce(string *type, char *BufferData, size_t BufferLength,
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ArgumentMap Arguments, size_t *DataSize) {
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VOption *options = VImage::option();
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VImage in =
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VImage::new_from_buffer(
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BufferData, BufferLength, "",
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*type == "gif" ? options->set("n", -1)->set("access", "sequential")
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: 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 width = in.width();
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int pageHeight = vips_image_get_page_height(in.get_image());
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int nPages = *type == "gif" ? vips_image_get_n_pages(in.get_image()) : 15;
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double mult = M_PI / nPages;
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int halfHeight = pageHeight / 2;
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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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double height = halfHeight * ((abs(sin(i * mult)) * -1) + 1);
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VImage embedded =
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img_frame.embed(0, height, width, pageHeight + halfHeight);
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img.push_back(embedded);
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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 + halfHeight);
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if (*type != "gif") {
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vector<int> delay(30, 50);
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final.set("delay", delay);
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}
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void *buf;
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final.write_to_buffer(".gif", &buf, DataSize);
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*type = "gif";
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return (char *)buf;
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} |