mrmBot-Matrix/natives/explode.cc

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2023-03-15 14:09:09 +00:00
#include <vips/vips8>
#include "common.h"
using namespace std;
using namespace vips;
char *Explode(string type, string *outType, char *BufferData,
size_t BufferLength, ArgumentMap Arguments, size_t *DataSize) {
bool implode = GetArgumentWithFallback<bool>(Arguments, "implode", false);
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string basePath = GetArgument<string>(Arguments, "basePath");
VOption *options = VImage::option();
VImage in =
VImage::new_from_buffer(
BufferData, BufferLength, "",
type == "gif" ? options->set("n", -1)->set("access", "sequential")
: options)
.colourspace(VIPS_INTERPRETATION_sRGB);
if (!in.has_alpha()) in = in.bandjoin(255);
int width = in.width();
int pageHeight = vips_image_get_page_height(in.get_image());
int nPages = vips_image_get_n_pages(in.get_image());
string distortPath = basePath + "assets/images/" +
(implode ? "linearimplode.png" : "linearexplode.png");
VImage distort =
(VImage::new_from_file(distortPath.c_str())
.resize(width / 500.0, VImage::option()
->set("vscale", pageHeight / 500.0)
->set("kernel", VIPS_KERNEL_CUBIC)) /
65535);
VImage distortImage = (distort[0] * width).bandjoin(distort[1] * pageHeight);
vector<VImage> img;
for (int i = 0; i < nPages; i++) {
VImage img_frame =
type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
VImage mapped = img_frame.mapim(distortImage);
img.push_back(mapped);
}
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, pageHeight);
void *buf;
final.write_to_buffer(("." + *outType).c_str(), &buf, DataSize);
return (char *)buf;
}