mrmBot-Matrix/natives/scott.cc

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#include <vips/vips8>
#include "common.h"
using namespace std;
using namespace vips;
ArgumentMap Scott(string type, string *outType, char *BufferData, size_t BufferLength,
ArgumentMap Arguments, size_t *DataSize) {
string basePath = GetArgument<string>(Arguments, "basePath");
string assetPathIn = GetArgumentWithFallback<string>(Arguments, "assetPath", "assets/images/scott.png");
string distortPathIn = GetArgumentWithFallback<string>(Arguments, "distortPath", "assets/images/scottmap.png");
int compx = GetArgumentWithFallback<int>(Arguments, "compx", 127);
int compy = GetArgumentWithFallback<int>(Arguments, "compy", 181);
VOption *options = VImage::option()->set("access", "sequential");
VImage in =
VImage::new_from_buffer(BufferData, BufferLength, "",
type == "gif" ? options->set("n", -1) : 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 assetPath = basePath + assetPathIn;
VImage bg = VImage::new_from_file(assetPath.c_str());
int bgwidth = bg.width();
int bgpageHeight = vips_image_get_page_height(bg.get_image());
string distortPath = basePath + distortPathIn;
VImage distort = VImage::new_from_file(distortPath.c_str());
VImage distortImage =
((distort[1] / 255) * 414).bandjoin((distort[0] / 255) * 233);
vector<VImage> img;
for (int i = 0; i < nPages; i++) {
VImage img_frame =
type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
VImage resized = img_frame.resize(
415 / (double)width,
VImage::option()->set("vscale", 234 / (double)pageHeight));
VImage mapped = resized.mapim(distortImage)
.extract_band(0, VImage::option()->set("n", 3))
.bandjoin(distort[2]);
VImage offset = mapped.embed(compx, compy, bgwidth, bgpageHeight);
VImage composited = bg.composite2(offset, VIPS_BLEND_MODE_OVER);
img.push_back(composited);
}
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, 481);
void *buf;
final.write_to_buffer(
("." + *outType).c_str(), &buf, DataSize,
*outType == "gif" ? VImage::option()->set("dither", 1) : 0);
ArgumentMap output;
output["buf"] = (char *)buf;
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output["width"] = final.width();
output["height"] = vips_image_get_page_height(final.get_image());
return output;
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}