mrmBot-Matrix/natives/uncanny.cc

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#include "common.h"
#include <napi.h>
#include <vips/vips8>
using namespace std;
using namespace vips;
Napi::Value Uncanny(const Napi::CallbackInfo &info) {
Napi::Env env = info.Env();
Napi::Object result = Napi::Object::New(env);
try {
Napi::Object obj = info[0].As<Napi::Object>();
Napi::Buffer<char> data = obj.Get("data").As<Napi::Buffer<char>>();
string caption = obj.Get("caption").As<Napi::String>().Utf8Value();
string caption2 = obj.Get("caption2").As<Napi::String>().Utf8Value();
string font = obj.Get("font").As<Napi::String>().Utf8Value();
string type = obj.Get("type").As<Napi::String>().Utf8Value();
string path = obj.Get("path").As<Napi::String>().Utf8Value();
string basePath = obj.Get("basePath").As<Napi::String>().Utf8Value();
VOption *options = VImage::option()->set("access", "sequential");
VImage in =
VImage::new_from_buffer(data.Data(), data.Length(), "",
type == "gif" ? options->set("n", -1) : options)
.colourspace(VIPS_INTERPRETATION_sRGB)
.extract_band(0, VImage::option()->set("n", 3));
VImage base = VImage::black(1280, 720, VImage::option()->set("bands", 3));
string font_string = (font == "roboto" ? "Roboto Condensed" : font) + ", Twemoji Color Font " +
(font != "impact" ? "bold" : "normal") + " 72";
string captionText = "<span background=\"black\" foreground=\"white\">" +
caption + "</span>";
string caption2Text =
"<span background=\"black\" foreground=\"red\">" + caption2 + "</span>";
auto findResult = fontPaths.find(font);
if (findResult != fontPaths.end()) {
VImage::text(
".", VImage::option()->set("fontfile",
(basePath + findResult->second).c_str()));
}
VImage text = VImage::text(
captionText.c_str(),
VImage::option()
->set("rgba", true)
->set("align", VIPS_ALIGN_CENTRE)
->set("font", font_string.c_str())
->set("fontfile", (basePath + "assets/fonts/twemoji.otf").c_str())
->set("width", 588)
->set("height", 90));
VImage captionImage =
text.extract_band(0, VImage::option()->set("n", 3))
.gravity(VIPS_COMPASS_DIRECTION_CENTRE, 640, text.height() + 40,
VImage::option()->set("extend", "black"));
VImage text2 = VImage::text(
caption2Text.c_str(),
VImage::option()
->set("rgba", true)
->set("align", VIPS_ALIGN_CENTRE)
->set("font", font_string.c_str())
->set("fontfile", (basePath + "assets/fonts/twemoji.otf").c_str())
->set("width", 588)
->set("height", 90));
VImage caption2Image =
text2.extract_band(0, VImage::option()->set("n", 3))
.gravity(VIPS_COMPASS_DIRECTION_CENTRE, 640, text.height() + 40,
VImage::option()->set("extend", "black"));
base = base.insert(captionImage, 0, 0).insert(caption2Image, 640, 0);
int width = in.width();
int pageHeight = vips_image_get_page_height(in.get_image());
int nPages = vips_image_get_n_pages(in.get_image());
VImage uncanny = VImage::new_from_file((basePath + path).c_str());
base = base.insert(uncanny, 0, 130);
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(690.0 / (double)width);
if (resized.height() > 590) {
double vscale = 590.0 / (double)resized.height();
resized =
resized.resize(vscale, VImage::option()->set("vscale", vscale));
}
VImage composited = base.insert(resized, 935 - (resized.width() / 2),
425 - (resized.height() / 2));
img.push_back(composited);
}
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, 720);
void *buf;
size_t length;
final.write_to_buffer(("." + type).c_str(), &buf, &length,
type == "gif" ? VImage::option()->set("reoptimise", 1)
: 0);
result.Set("data", Napi::Buffer<char>::Copy(env, (char *)buf, length));
result.Set("type", type);
} catch (std::exception const &err) {
Napi::Error::New(env, err.what()).ThrowAsJavaScriptException();
} catch (...) {
Napi::Error::New(env, "Unknown error").ThrowAsJavaScriptException();
}
vips_error_clear();
vips_thread_shutdown();
return result;
}